Backrest Mechanism, Seat Bracket and Sofa

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This disclosure claims priority to the following Chinese patent applications:

• • 1. this application claims priority to Chinese patent application No. CN202411432715.4, entitled “Backrest Mechanism, Seat Bracket and Sofa” filed with the China National Intellectual Property Administration on Oct. 14, 2024;
  • 2. this application claims priority to Chinese patent application No. CN202422490972.5, entitled “Backrest Mechanism, Seat Bracket and Sofa” filed with the China National Intellectual Property Administration on Oct. 14, 2024;
  • 3. this application claims priority to Chinese patent application No. CN202422482510.9, entitled “Backrest Mechanism, Seat Bracket and Sofa” filed with the China National Intellectual Property Administration on Oct. 14, 2024; and
  • 4. this application claims priority to Chinese patent application No. CN202521313103.3, entitled “Driving Structure, Functional Iron Frame and Movable Sofa with Same” filed with the China National Intellectual Property Administration on Jun. 24, 2025.

All contents of the above Chinese patent applications are incorporated by reference in this application.

Technical Field

This disclosure relates to the technical field of furniture, specifically to a backrest mechanism, a seat bracket and a sofa.

BACKGROUND

A movable sofa is common furniture in daily life, which allows people to adjust postures according to needs. The movable sofa usually includes two or three of a lying posture, a TV posture and a sitting posture. The movable sofa includes legs, a seat and a backrest. Cushions are arranged on the corresponding structures to form a cushion seat, a cushion backrest, a cushion foot shelf and the like of the sofa. In the sitting posture, the legs are not opened, the seat is close to a horizontal state, and the backrest is in a nearly upright state. In the TV posture (also known as the television posture), the legs are opened forward, and the backrest basically remains unchanged. In the lying posture, the backrest is tilted backward, and the legs basically remain unchanged for people to rest.

However, a backrest mounting plate of an existing sofa is hinged to a seat frame mounting member, and then, the position of a backrest cushion is limited on the seat frame mounting member, so that the zero wall leaning function of the sofa cannot be achieved. Moreover, in the lying posture state, as the forward movement distance increases, the angle between partial adjacent connecting rods of the backrest may become too large, which may affect the carrying capacity, stability and movement smoothness of the backrest and even the entire sofa.

SUMMARY

This disclosure provides a backrest mechanism, a seat bracket and a sofa to solve the problem that sofas in related technologies cannot achieve the zero wall leaning function.

According to one aspect of this disclosure, a backrest mechanism is provided. The backrest mechanism includes: a backrest mounting plate; and a driving assembly, including a front backrest connecting rod, a rear backrest connecting rod and a driving member, the front end of the front backrest connecting rod being hinged to the front end of the backrest mounting plate, the upper end of the rear backrest connecting rod being hinged to the rear end of the backrest mounting plate, the front backrest connecting rod and the rear backrest connecting rod being hinged to a seat frame mounting member by the driving member, and the driving member being provided with a limiting end capable of receiving an external acting force, so as to enable the driving member to rotate relative to the seat frame mounting member, wherein the backrest mounting plate has a folding position for folding the backrest mounting plate relative to the seat frame mounting member and an unfolding position for enabling the backrest mounting plate to tilt backward relative to the seat frame mounting member, and the driving member can drive the backrest mounting plate to move between the folding position and the unfolding position by the front backrest connecting rod and the rear backrest connecting rod.

Further, the driving member includes a driving plate and a limiting rod, the lower end of the rear backrest connecting rod is hinged to the driving plate, the driving plate is hinged to the seat frame mounting member, the limiting end is arranged on the driving plate, the limiting rod is hinged to the front backrest connecting rod, one of the front backrest connecting rod and the limiting rod is hinged to the seat frame mounting member, and the other of the front backrest connecting rod and the limiting rod is hinged to the driving plate.

Further, the upper end of the limiting rod is hinged to the middle of the front backrest connecting rod, the lower end of the limiting rod is hinged to the seat frame mounting member, and the rear end of the front backrest connecting rod is hinged to the driving plate.

Further, the front backrest connecting rod and the rear backrest connecting rod are arranged crosswise, and the rear end of the front backrest connecting rod is located behind the lower end of the rear backrest connecting rod; and/or when the backrest mounting plate is located at the folding position, the upper end of the rear backrest connecting rod is located behind the lower end thereof, and when the backrest mounting plate is located at the unfolding position, the upper end of the rear backrest connecting rod is located in front of the lower end thereof; and/or when the backrest mounting plate is switched from the folding position to the unfolding position, the front end of the backrest mounting plate moves forward and moves downward; and/or when the backrest mounting plate is switched from the folding position to the unfolding position, the rotation angle of the backrest mounting plate relative to the seat frame mounting member is 24°-40°.

Further, the front end of the front backrest connecting rod is hinged to the front end of the backrest mounting plate at a first hinge point O, the upper end of the rear backrest connecting rod is hinged to the rear end of the backrest mounting plate at a second hinge point E, the lower end of the rear backrest connecting rod is hinged to the driving plate at a third hinge point C, a connecting line between the first hinge point O and the second hinge point E is a connecting line L1, a connecting line between the second hinge point E and the third hinge point C is a connecting line L2, an included angle between the connecting line L1 and the connecting line L2 is an included angle α, and when the backrest mounting plate is located at the unfolding position, the included angle α is 40°-135°; and/or the front end of the front backrest connecting rod is hinged to the front end of the backrest mounting plate at the first hinge point O, the rear end of the front backrest connecting rod is hinged to the driving plate at a fourth hinge point B, the limiting end of the driving plate is a fifth hinge point D, a connecting line between the first hinge point O and the fourth hinge point B is a connecting line L3, a connecting line between the fourth hinge point B and the fifth hinge point D is a connecting line L4, an included angle between the connecting line L3 and the connecting line L4 is an included angle β, and when the backrest mounting plate is located at the unfolding position, the included angle β is 40°-135°; and/or the lower end of the rear backrest connecting rod is hinged to the driving plate at the third hinge point C, the rear end of the front backrest connecting rod is hinged to the driving plate at the fourth hinge point B, the seat frame mounting member is hinged to the driving plate at a sixth hinge point A, a connecting line between the third hinge point C and the fourth hinge point B is a connecting line L5, a connecting line between the fourth hinge point B and the sixth hinge point A is a connecting line L6, and the size of the connecting line L5 is greater than the size of the connecting line L6; and/or the lower end of the rear backrest connecting rod is hinged to the driving plate at the third hinge point C, the rear end of the front backrest connecting rod is hinged to the driving plate at the fourth hinge point B, the seat frame mounting member is hinged to the driving plate at the sixth hinge point A, a connecting line between the fourth hinge point B and the sixth hinge point A is a connecting line L6, a connecting line between the third hinge point C and the sixth hinge point A is a connecting line L7, and the size of the connecting line L6 is less than the size of the connecting line L7; and/or when the backrest mounting plate is located at the folding position, the hinge point between the seat frame mounting member and the driving plate is located in front of the rear end of the front backrest connecting rod, and when the backrest mounting plate is located at the unfolding position, the hinge point between the seat frame mounting member and the driving plate is located behind the rear end of the front backrest connecting rod.

Further, the driving member includes a driving structure and a limiting structure, wherein the driving structure is hinged to the seat frame mounting member, the driving structure, the front end of the backrest mounting plate and the rear end of the backrest mounting plate form a first four-bar linkage mechanism, the backrest mounting plate has a folding position for folding the backrest mounting plate relative to the seat frame mounting member and an unfolding position for enabling the backrest mounting plate to tilt backward relative to the seat frame mounting member, and the driving structure can drive the backrest mounting plate to move between the folding position and the unfolding position; and the limiting structure is movably arranged on the seat frame mounting member, the limiting structure and the seat frame mounting member form a second four-bar linkage mechanism, and the upper end of the limiting structure is hinged to the backrest mounting plate, so as to limit the movement trajectory of the backrest mounting plate.

Further, the driving structure includes a driving plate, the rear end of the front backrest connecting rod and the lower end of the rear backrest connecting rod are respectively hinged to the driving plate, the backrest mounting plate is hinged to the seat frame mounting member, the driving plate has a limiting end, and the backrest mounting plate, the front backrest connecting rod, the rear backrest connecting rod and the driving plate together form the first four-bar linkage mechanism; and/or the limiting structure includes a limiting rod, the upper end of the limiting rod is hinged to the middle of the front backrest connecting rod, the lower end of the limiting rod is hinged to the seat frame mounting member, and the front backrest connecting rod, the driving plate, the seat frame mounting member and the limiting rod together form the second four-bar linkage mechanism.

Further, when the backrest mounting plate is switched from the folding position to the unfolding position, in a direction parallel to a mounting surface of the seat frame mounting member, the movement distance of the front end of the backrest mounting plate is H1; in a direction perpendicular to the mounting surface of the seat frame mounting member, the movement distance of the front end of the backrest mounting plate is H2; and an absolute value of a difference between the H1 and the H2 is less than or equal to a preset size.

Further, the preset size is 10 cm; and/or the driving member includes a driving plate, the rear end of the front backrest connecting rod and the lower end of the rear backrest connecting rod are respectively hinged to the driving plate, and the driving plate has a limiting end.

According to another aspect of the present invention, a seat bracket is provided. The seat bracket includes: a mounting base fixed relative to the ground; a seat frame mounting member movably connected to the mounting base, the seat frame mounting member being capable of moving relative to the mounting base; a footrest mechanism hinged to the front end of the seat frame mounting member; and a backrest mechanism, a driving plate of the backrest mechanism being respectively hinged to the mounting base and the seat frame mounting member, and the backrest mechanism being the backrest mechanism provided above.

Further, the mounting base is an armrest mounting plate, the seat bracket further includes a suspension assembly and a movable assembly, the suspension assembly is arranged on the seat frame mounting member in a swinging manner, and the front end and rear end of the suspension assembly are movably connected to the armrest mounting plate respectively through the movable assembly; or when the seat bracket is switched among a sitting posture, a TV posture and a lying posture, a distance between the backrest mounting plate of the backrest mechanism and a preset vertical plane is greater than or equal to 0.

Further, the seat bracket further includes a driving mechanism, the footrest mechanism and the backrest mechanism are respectively arranged in an extendable or retractable manner, position postures of the seat bracket include a sitting posture state, a leisure posture state and a lying posture state, and the driving mechanism includes: a driving body connected to the mounting base and located at an end close to the backrest mechanism, at least part of the driving body being movably arranged along a horizontal direction; and a transmission component connected to at least part of the driving body and the footrest mechanism respectively to drive the transmission component to move by at least part of the driving body, so as to switch the seat bracket among the sitting posture state, the leisure posture state and the lying posture state, wherein the position of the lowest point of the transmission component is higher than the position of the lowest point of the driving body.

Further, the driving body includes: a guide rail arranged in an extending manner along a horizontal direction; a guide member slidably arranged on the guide rail, two ends of the transmission component being respectively connected to the guide member and the footrest mechanism; and a motor component in driving connection with the guide member to drive the guide member to drive the transmission component to move along an extension direction of the guide rail. The transmission component includes: a transmission rod, one end of the transmission rod being hinged to at least part of the driving body; and a front driving tube, the other end of the transmission rod being hinged to the front driving tube, and one end of the front driving tube being connected to the footrest mechanism.

Further, at least one transmission rod is provided, and the transmission component further includes: a shielding plate connected to the at least one transmission rod or the front driving tube; and the seat frame mounting member has a support surface for carrying a user, and a top surface of the shielding plate is arranged close to the support surface, so as to support the user.

Further, the seat bracket further includes a driving mechanism, the footrest mechanism and the backrest mechanism are respectively arranged in an extendable or retractable manner, position postures of the seat bracket include a sitting posture state, a leisure posture state and a lying posture state, and the driving mechanism includes: a driving component connected to the mounting base and located at an end close to the backrest mechanism; and a movable component connected to a driving end of the driving component and the footrest mechanism respectively, at least part of the movable component being movably arranged along a direction inclined to the horizontal plane to drive the movable component to move through the driving component, so as to switch the seat bracket among the sitting posture state, the leisure posture state and the lying posture state, wherein the driving component and the movable component extend along the direction inclined to the horizontal plane in a same straight line, and the driving component is located below the movable component.

Further, the movable component includes: a push rod connected to the driving end of the driving component, an end of the push rod away from the driving component is telescopically arranged; and a middle mounting rod, the end of the push rod away from the driving component being hinged to the middle mounting rod, and one end of the middle mounting rod being connected to the footrest mechanism.

Further, a distance K1 between a lower surface of the armrest mounting plate and the ground is 11 cm-17 cm; and/or the suspension assembly includes a front swing rod, a transition swing rod and a rear swing rod, the upper end of the front swing rod and the upper end of the rear swing rod are respectively hinged to the seat frame mounting member, the lower end of the front swing rod and the lower end of the rear swing rod are respectively hinged to the transition swing rod, and the front end and rear end of the transition swing rod are movably connected to the armrest mounting plate respectively through the movable assembly; and/or the movable assembly includes a slide rail and a pulley slidably arranged in the slide rail, one of the pulley and the slide rail is arranged on the suspension assembly, and the other of the pulley and the slide rail is arranged on the armrest mounting plate; and/or the movable assembly includes a first connecting rod, a second connecting rod and a third connecting rod, the lower end of the first connecting rod and the lower end of the second connecting rod are respectively hinged to the armrest mounting plate, the upper end of the first connecting rod is hinged to the middle of the third connecting rod, the upper end of the second connecting rod is hinged to the rear end of the third connecting rod, and the front end of the third connecting rod is hinged to the suspension assembly; and/or when the backrest mounting plate of the backrest mechanism is switched from the folding position to the unfolding position, the rotation angle of the backrest mounting plate relative to the seat frame mounting member is 25°-38°.

Further, the seat bracket includes a front driving rod and a rear driving rod, the front end of the front driving rod is hinged to the footrest mechanism, the rear end of the front driving rod is hinged to the suspension assembly, the upper end of the rear driving rod is hinged to the limiting end of the driving plate, and the lower end of the rear driving rod is hinged to the armrest mounting plate; and the footrest mechanism includes a footrest driving plate, an inner footrest plate, an outer footrest plate, a rear footrest plate, a first front footrest connecting rod, a second front footrest connecting rod, a front footrest plate, a front footrest and a rear footrest, the rear end of the footrest driving plate is hinged to the front end of the front driving rod, the middle of the footrest driving plate is hinged to the seat frame mounting member, the front end of the footrest driving plate is hinged to the rear end of the outer footrest plate, the middle of the outer footrest plate is hinged to the middle of the inner footrest plate, the front end of the outer footrest plate is hinged to the rear end of the first front footrest connecting rod, the middle of the first front footrest connecting rod is hinged to the middle of the rear footrest plate, the front end of the first front footrest connecting rod is hinged to the rear end of the second front footrest connecting rod, the middle of the second front footrest connecting rod is hinged to the middle of the rear footrest, the front end of the second front footrest connecting rod is hinged to the rear end of the front footrest, the rear end of the front footrest plate is hinged to the front end of the rear footrest, the front end of the front footrest plate is hinged to the front end of the front footrest, the front end of the rear footrest plate is hinged to the rear end of the rear footrest, the rear end of the rear footrest plate is hinged to the front end of the inner footrest plate, and the rear end of the inner footrest plate is hinged to the seat frame mounting member, wherein the outer footrest plate is provided with a limiting button, and after the footrest mechanism is unfolded, the limiting button is attached to the inner footrest plate.

Further, the suspension assembly includes: a transition swing rod, the transition swing rod is movably connected to the mounting base by an auxiliary swing assembly and the movable assembly, and the transition swing rod is movably connected to the seat frame mounting member by a connecting assembly, so as to enable the seat frame mounting member to be movably arranged relative to the mounting base.

Further, the auxiliary swing assembly includes: a first swing connecting rod, the first end of the first swing connecting rod being hinged to the mounting base; a second swing connecting rod, the first end of the second swing connecting rod being hinged to the transition swing rod, and the second end of the second swing connecting rod being hinged to the second end of the first swing connecting rod; and a front swing auxiliary rod, the first end of the front swing auxiliary rod being hinged to the middle of the second swing connecting rod, and the second end of the front swing auxiliary rod being hinged to the mounting base.

Further, the auxiliary swing assembly includes: a first swing connecting rod, the first end of the first swing connecting rod being hinged to the transition swing rod; a second swing connecting rod, the first end of the second swing connecting rod being hinged to the transition swing rod; and a front swing auxiliary rod, the first end of the front swing auxiliary rod being hinged to the second end of the first swing connecting rod, the second end of the second swing connecting rod being hinged to the middle of the front swing auxiliary rod, and the second end of the front swing auxiliary rod being hinged to the mounting base.

Further, the seat bracket includes a driving mechanism, the suspension assembly includes a transition swing rod, and the transition swing rod is movably connected to the seat frame mounting member through a connecting assembly, so as to enable the seat frame mounting member to be movably arranged relative to the mounting base. The connecting assembly includes: a rear swing rod, the first end of the rear swing rod being hinged to the transition swing rod, and the second end of the rear swing rod being hinged to the seat frame mounting member; and a front swing rod, the front swing rod and the rear swing rod being arranged at an interval, the first end of the front swing rod being hinged to the transition swing rod, and the second end of the front swing rod being hinged to the seat frame mounting member. The footrest mechanism includes: a first connecting rod group and a second connecting rod group, wherein the first connecting rod group includes a footrest driving plate, an outer footrest plate, a first front footrest connecting rod and a second front footrest connecting rod which are pivotally connected in sequence, and the second connecting rod group includes an inner footrest plate and a rear footrest plate which are pivotally connected; and the middle of the outer footrest plate is hinged to the middle of the inner footrest plate, the middle of the first front footrest connecting rod is hinged to the middle of the rear footrest plate, the footrest driving plate and the inner footrest plate are respectively hinged to the seat frame mounting member, and at least part of the driving mechanism is optionally connected to the footrest driving plate or the outer footrest plate or the first front footrest connecting rod or the second front footrest connecting rod or the inner footrest plate or the rear footrest plate; and a first foot shelf and a rear footrest, wherein an end of the rear footrest plate away from the inner footrest plate is hinged to the first end of the rear footrest. The first foot shelf includes a front footrest plate and a front footrest which are pivotally connected, the second end of the rear footrest is hinged to the front footrest plate, an end of the second front footrest connecting rod away from the first front footrest connecting rod is hinged to the front footrest, and the third end of the rear footrest is hinged to the middle of the second front footrest connecting rod, wherein an included angle is formed between the front footrest plate and the front footrest.

Further, when the backrest mounting plate of the backrest mechanism is located at the unfolding position, an included angle γ between the mounting surface of the seat frame mounting member and the horizontal plane is 13°-30°; and/or when the backrest mounting plate of the backrest mechanism is located at the unfolding position, an included angle δ between the backrest mounting plate and the horizontal plane is 20°-30°; and/or when the backrest mounting plate of the backrest mechanism is located at the unfolding position, a vertical distance K2 between the highest point of the footrest mechanism and the highest point of the backrest mounting plate is 260 mm-380 mm; and/or position postures of the seat bracket include a sitting posture state, a leisure posture state and a lying posture state; taking a plane of a support foundation as a reference plane, when the seat bracket is switched from the sitting posture state to the lying posture state, the hinge location between the backrest mounting plate and the front backrest connecting rod or the hinge location between the backrest mounting plate and the rear backrest connecting rod is moved by a preset distance K3 relative to the reference plane along a horizontal direction, wherein the preset distance K3 is 228 mm-346 mm; and/or taking the seat frame mounting member as a reference object, when the seat bracket is switched from the sitting posture state to the lying posture state, the hinge location between the backrest mounting plate and the front backrest connecting rod or the hinge location between the backrest mounting plate and the rear backrest connecting rod is moved by a preset distance K4 relative to the reference object, wherein the preset distance K4 is 60 mm-100 mm; and/or when the backrest mounting plate of the backrest mechanism is switched from the folding position to the unfolding position, the front end of the backrest mounting plate first moves downward and then moves upward; and/or when the seat bracket is switched among a sitting posture, a TV posture and a lying posture, a distance between the backrest mounting plate of the backrest mechanism and a preset vertical plane is greater than or equal to 0.

According to still another aspect of the present invention, a sofa is provided. The sofa includes the seat bracket provided above.

By applying the technical solutions of this disclosure, the backrest mechanism includes the backrest mounting plate and the driving assembly, and an external acting force can be applied to the limiting end of the driving member, so that the driving member can rotate relative to the seat frame mounting member. The front backrest connecting rod and the rear backrest connecting rod are hinged to the seat frame mounting member by the driving member, so that the driving member can drive the front backrest connecting rod and the rear backrest connecting rod to move, the front end of the front backrest connecting rod can drive the front end of the backrest mounting plate to move, and the upper end of the rear backrest connecting rod can drive the rear end of the backrest mounting plate to move. Therefore, the backrest mounting plate can move relative to the seat frame mounting member, and the relative position between the backrest mounting plate and the seat frame mounting member is more flexible. When the backrest mounting plate is switched from the folding position to the unfolding position, the backrest mounting plate can move forward a greater distance relative to the seat frame mounting member, so as to solve the problem of interference between a backrest and a wall, thereby achieving the zero wall leaning function of the sofa. Moreover, because the front backrest connecting rod and the rear backrest connecting rod are both hinged to the driving member, during the movement of the backrest mounting plate, the linkage performance between connecting rods is enhanced, so as to enhance the carrying capacity, stability and movement smoothness of the sofa.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings of the specification, constituting a part of this disclosure, are used to provide a further understanding for this disclosure. Exemplary embodiments of this disclosure and descriptions thereof are used to explain this disclosure, but do not constitute any improper limitation on this disclosure. In the accompanying drawings:

FIG. 1 shows a schematic structural diagram when a backrest mounting plate of a backrest mechanism according to an embodiment of this disclosure is located at a folding position;

FIG. 2 shows another schematic structural diagram when the backrest mounting plate of the backrest mechanism according to an embodiment of this disclosure is located at the folding position;

FIG. 3 shows a schematic structural diagram when the backrest mounting plate of the backrest mechanism according to an embodiment of this disclosure is located at an unfolding position;

FIG. 4 shows another schematic structural diagram when the backrest mounting plate of the backrest mechanism according to an embodiment of this disclosure is located at the unfolding position;

FIG. 5 shows still another schematic structural diagram when the backrest mounting plate of the backrest mechanism according to an embodiment of this disclosure is located at the unfolding position;

FIG. 6 shows a schematic structural diagram when a seat bracket according to another embodiment of this disclosure is in a lying posture state;

FIG. 7 shows an enlarged diagram of a part G in FIG. 6;

FIG. 8 shows another schematic structural diagram when the seat bracket according to another embodiment of this disclosure is in the lying posture state;

FIG. 9 shows still another schematic structural diagram when the seat bracket according to another embodiment of this disclosure is in the lying posture state;

FIG. 10 shows a schematic structural diagram when the seat bracket according to another embodiment of this disclosure is in a TV posture state;

FIG. 11 shows a schematic structural diagram when the seat bracket according to another embodiment of this disclosure is in a sitting posture state;

FIG. 12 shows a comparison diagram of three postures of the seat bracket according to another embodiment of this disclosure;

FIG. 13 shows a schematic structural diagram when a seat bracket according to still another embodiment of this disclosure is in a lying posture state;

FIG. 14 shows another schematic structural diagram when the seat bracket according to still another embodiment of this disclosure is in the lying posture state;

FIG. 15 shows still another schematic structural diagram when the seat bracket according to still another embodiment of this disclosure is in the lying posture state;

FIG. 16 shows a schematic diagram of an overall structure from the first perspective when a seat bracket according to an embodiment of this disclosure is in a sitting posture state;

FIG. 17 shows a schematic diagram of an overall structure from the second perspective when a seat bracket according to an embodiment of this disclosure is in a sitting posture state;

FIG. 18 shows a schematic diagram of an overall structure from the first perspective when a seat bracket according to an embodiment of this disclosure is in a leisure posture state;

FIG. 19 shows a schematic diagram of an overall structure from the second perspective when a seat bracket according to an embodiment of this disclosure is in a leisure posture state;

FIG. 20 shows a schematic structural diagram of another embodiment of an auxiliary swing assembly when a seat bracket according to an embodiment of this disclosure is in a leisure posture state;

FIG. 21 shows a schematic diagram of an overall structure from the first perspective when a seat bracket according to an embodiment of this disclosure is in a lying posture state;

FIG. 22 shows a schematic diagram of an overall structure from the second perspective when a seat bracket according to an embodiment of this disclosure is in a lying posture state;

FIG. 23 shows a schematic diagram of an overall structure with a driving mechanism of another embodiment when a seat bracket according to an embodiment of this disclosure is in a sitting posture state;

FIG. 24 shows a schematic structural diagram of another embodiment of an auxiliary swing assembly when a seat bracket according to an embodiment of this disclosure is in a lying posture state;

FIG. 25 shows a schematic structural diagram of still another embodiment of an auxiliary swing assembly when a seat bracket according to an embodiment of this disclosure is in a lying posture state;

FIG. 26 shows a structural comparison diagram when a seat bracket according to an embodiment of this disclosure is in three position postures respectively; and

FIG. 27 shows a schematic diagram of structural change when a backrest mechanism provided in a seat bracket according to an embodiment of this disclosure is switched from a leisure posture state to a lying posture state.

The above accompanying drawings have the following reference numerals:

• • 10. backrest mounting plate; 11. convex part;
  • 20. driving assembly; 21. front backrest connecting rod; 22. rear backrest connecting rod; 23. driving plate; 24. limiting rod;
  • 30. armrest mounting plate;
  • 40. seat frame mounting member;
  • 50. footrest mechanism; 51. footrest driving plate; 52. inner footrest plate; 53. outer footrest plate; 531. limiting button; 54. rear footrest plate; 55. first front footrest connecting rod; 56. second front footrest connecting rod; 57. front footrest plate; 58. front footrest; 59. rear footrest;
  • 60. backrest mechanism;
  • 70. suspension assembly; 71. front swing rod; 72. transition swing rod; 73. rear swing rod;
  • 80. movable assembly; 81. slide rail; 83. first connecting rod; 84. second connecting rod; 85. third connecting rod;
  • 90. front driving tube; 91. rear driving tube; 92. front driving rod; 93. rear driving rod;
  • 100. auxiliary swing assembly; 101. front swing auxiliary rod; 102. transition swing auxiliary rod; 103. rear swing auxiliary rod; 104. first swing connecting rod; 105. second swing connecting rod; 106. third swing connecting rod; 107. fixed connecting rod;
  • 1-10. mounting base; 1-11. armrest main plate; 1-13. fixed frame;
  • 320. first slide roller; 321. first guide track; 34. connecting assembly; 343. first limiting component; 47. first foot shelf; 49. second limiting component;
  • 540. first hinge location; 541. second hinge location; 542. third hinge location; 543. fourth hinge location;
  • 1-60. driving mechanism; 61. driving body; 610. guide rail; 611. guide member; 612. motor component; 62. transmission component; 620. transmission rod; 622. shielding plate; 63. driving component; 64. movable component; 640. push rod; 641. middle mounting rod.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The technical solutions in the embodiments of this disclosure are clearly and completely described below with reference to the accompanying drawings in the embodiments of this disclosure. Apparently, the described embodiments are merely some rather than all of the embodiments of this disclosure. The following descriptions of at least one exemplary embodiment are merely illustrative actually, and should not be construed as any limitation on this disclosure and the disclosure or use thereof. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this disclosure without creative work shall fall within the protection scope of this disclosure.

As shown in FIG. 1 to FIG. 5, an embodiment of this disclosure provides a backrest mechanism. The backrest mechanism 60 includes a backrest mounting plate 10 and a driving assembly 20. The driving assembly 20 includes a front backrest connecting rod 21, a rear backrest connecting rod 22 and a driving member. The front end of the front backrest connecting rod 21 is hinged to the front end of the backrest mounting plate 10, the upper end of the rear backrest connecting rod 22 is hinged to the rear end of the backrest mounting plate 10, the front backrest connecting rod 21 and the rear backrest connecting rod 22 are hinged to a seat frame mounting member 40 through the driving member, and the driving member is provided with a limiting end capable of receiving an external acting force, so as to enable the driving member to rotate relative to the seat frame mounting member 40, wherein the backrest mounting plate 10 has a folding position for folding the backrest mounting plate 10 relative to the seat frame mounting member 40 and an unfolding position for enabling the backrest mounting plate 10 to tilt backward relative to the seat frame mounting member 40, and the driving member can drive the backrest mounting plate 10 to move between the folding position and the unfolding position through the front backrest connecting rod 21 and the rear backrest connecting rod 22.

By applying the technical solutions of this disclosure, the backrest mechanism includes the backrest mounting plate 10 and the driving assembly 20, and an external acting force can be applied to the limiting end of the driving member, so that the driving member can rotate relative to the seat frame mounting member 40. The front backrest connecting rod 21 and the rear backrest connecting rod 22 are hinged to the seat frame mounting member 40 through the driving member, so that the driving member can drive the front backrest connecting rod 21 and the rear backrest connecting rod 22 to move, the front end of the front backrest connecting rod 21 can drive the front end of the backrest mounting plate 10 to move, and the upper end of the rear backrest connecting rod 22 can drive the rear end of the backrest mounting plate 10 to move. Therefore, the backrest mounting plate 10 can move relative to the seat frame mounting member 40, and the relative position between the backrest mounting plate 10 and the seat frame mounting member 40 is more flexible. When the backrest mounting plate 10 is switched from the folding position to the unfolding position, the backrest mounting plate 10 can move forward a greater distance relative to the seat frame mounting member 40, so as to solve the problem of interference between a backrest and a wall, thereby achieving the zero wall leaning function of the sofa. Moreover, because the front backrest connecting rod 21 and the rear backrest connecting rod 22 are both hinged to the driving member, during the movement of the backrest mounting plate 10, the linkage performance between connecting rods is enhanced, so as to enhance the carrying capacity, stability and movement smoothness of the sofa.

The front backrest connecting rod 21 and the rear backrest connecting rod 22 are hinged to the seat frame mounting member 40 by the driving member, meaning that the front backrest connecting rod 21 and the rear backrest connecting rod 22 are hinged to the driving member, and the driving member is hinged to the seat frame mounting member 40. When an external acting force is applied to the limiting end of the driving member, the driving member rotates relative to the seat frame mounting member 40 and drives the front backrest connecting rod 21 and the rear backrest connecting rod 22 to move.

It should be noted that in this embodiment, forward and backward directions correspond to the perspective shown in FIG. 6, wherein the unfolding direction of the footrest mechanism 50 is forward, and the backward tilting direction of the backrest mechanism 60 is backward.

FIG. 1 only shows partial structures of the seat frame mounting member 40.

The inventor found that the forward movement and backward tilting of a backrest of an existing sofa are controlled by a same four-bar linkage. In practical use, the size of the backrest structure is greatly limited, resulting in relatively low designability and practicability.

To solve the above problems, the driving member of this embodiment includes a driving structure and a limiting structure. The driving structure is hinged to the seat frame mounting member 40, the driving structure, the front end of the backrest mounting plate 10 and the rear end of the backrest mounting plate 10 form a first four-bar linkage mechanism, the backrest mounting plate 10 has a folding position for folding the backrest mounting plate 10 relative to the seat frame mounting member 40 and an unfolding position for enabling the backrest mounting plate 10 to tilt backward relative to the seat frame mounting member 40, and the driving structure can drive the backrest mounting plate 10 to move between the folding position and the unfolding position. The limiting structure is movably arranged on the seat frame mounting member 40, the limiting structure and the seat frame mounting member 40 form a second four-bar linkage mechanism, and the upper end of the limiting structure is hinged to the backrest mounting plate 10, so as to limit the movement trajectory of the backrest mounting plate 10.

The driving structure, the front end of the backrest mounting plate 10 and the rear end of the backrest mounting plate 10 form a first four-bar linkage mechanism, and the first four-bar linkage mechanism can be deformed by the deformation of the driving structure, so that the backrest mounting plate 10 can be folded or unfolded relative to the seat frame mounting member 40. Moreover, because the limiting structure and the seat frame mounting member 40 form a second four-bar linkage mechanism, during the movement of the backrest mounting plate 10, the movement trajectory of the backrest mounting plate 10 can be limited by the limiting structure, and then the backrest mounting plate 10 has a suitable backward tilting angle and a suitable forward movement distance. Compared with the manner of controlling the forward movement and backward tilting of the backrest by the same four-bar linkage, the backward tilting and forward movement of the backrest mounting plate 10 of the backrest mechanism are controlled by different four-bar linkage mechanisms, resulting in improved designability and practicability.

The upper end of the limiting mechanism may be hinged to the front end of the backrest mounting plate 10 to limit the movement trajectory of the front end of the backrest mounting plate 10. Or, the upper end of the limiting mechanism may be hinged to the rear end of the backrest mounting plate 10 to limit the movement trajectory of the rear end of the backrest mounting plate 10.

The driving structure includes a driving plate 23, and the rear end of the front backrest connecting rod 21 and the lower end of the rear backrest connecting rod 22 are respectively hinged to the driving plate 23. The backrest mounting plate 10 is hinged to the seat frame mounting member 40, and the backrest mounting plate 10, the front backrest connecting rod 21, the rear backrest connecting rod 22 and the driving plate 23 together form a first four-bar linkage mechanism. By using the above first four-bar linkage mechanism, an external acting force can be applied to the driving plate 23 to enable the driving plate 23 to rotate relative to the seat frame mounting member 40, so as to drive the front backrest connecting rod 21 and the rear backrest connecting rod 22 to move, and the backrest mounting plate 10 can be tilted backward or folded by the front backrest connecting rod 21 and the rear backrest connecting rod 22.

The limiting structure includes a limiting rod 24, the upper end of the limiting rod 24 is hinged to the middle of the front backrest connecting rod 21, and the lower end of the limiting rod 24 is hinged to the seat frame mounting member 40. The front backrest connecting rod 21, the driving plate 23, the seat frame mounting member 40 and the limiting rod 24 together form a second four-bar linkage mechanism. By using the above second four-bar linkage mechanism, the movement trajectory of the front backrest connecting rod 21 can be limited, so as to limit the movement trajectory of the front end of the backrest mounting plate 10.

Moreover, by using the above backrest mechanism 60, because two groups of four-bar linkage mechanisms are provided, the backrest mounting plate 10 forward moves a greater distance while the backrest backward tilts a greater angle. Therefore, the backrest mechanism 60 provides users with better zero wall leaning experience and zero gravity experience when applied to a sofa.

The inventor also found that the backrest of the existing sofa is difficult to forward move a greater distance while backward tilting a greater angle, resulting in poor experience effect of the sofa capable of achieving zero gravity and zero wall leaning functions simultaneously.

To solve the above problems, in this embodiment, when the backrest mounting plate 10 is switched from the folding position to the unfolding position, in a direction parallel to a mounting surface of the seat frame mounting member 40, the movement distance of the front end of the backrest mounting plate 10 is H1; in a direction perpendicular to the mounting surface of the seat frame mounting member 40, the movement distance of the front end of the backrest mounting plate 10 is H2; and an absolute value of a difference between the H1 and the H2 is less than or equal to a preset size.

Because the upper end of the driving assembly 20 is hinged to both the front end of the backrest mounting plate 10 and the rear end of the backrest mounting plate 10, and the lower end of the driving assembly 20 is hinged to the seat frame mounting member 40, the driving assembly 20 can be used to drive the backrest mounting plate 10 to move relative to the seat frame mounting member 40, so as to enable the backrest mounting plate 10 to move between the folding position and the unfolding position. When the backrest mounting plate 10 is switched from the folding position to the unfolding position, in a direction parallel to the mounting surface of the seat frame mounting member 40, the movement distance of the front end of the backrest mounting plate 10 is H1; in a direction perpendicular to the mounting surface of the seat frame mounting member 40, the movement distance of the front end of the backrest mounting plate 10 is H2; and the absolute value of the difference between the H1 and the H2 is less than or equal to the preset size, so that when the backrest backward tilts, the backrest can not only have a suitable forward movement distance to avoid interference with a wall, but also have a suitable downward movement distance to reduce the height of the upper body of a user, thereby achieving the zero gravity function, and enhancing the use experience of the zero wall leaning function and the zero gravity function.

It should be noted that the preset size is preferably 10 cm, wherein the preset size is preferably 3 cm. In this case, the user can fully experience the zero wall leaning function and zero gravity function of the sofa.

Of course, the preset size may be 10 cm, 8 cm, 5 cm, 3 cm, and any value less than or equal to 10 cm.

It should be noted that in Embodiment 1, the H1 is greater than the H2. In other embodiments, the H1 may be less than the H2.

As shown in FIG. 1 and FIG. 3, the driving member includes a driving plate 23 and a limiting rod 24, the lower end of the rear backrest connecting rod 22 is hinged to the driving plate 23, the driving plate 23 has a limiting end, the driving plate 23 is hinged to the seat frame mounting member 40, the limiting end is arranged on the driving plate 23, the limiting rod 24 is hinged to the front backrest connecting rod 21, one of the front backrest connecting rod 21 and the limiting rod 24 is hinged to the seat frame mounting member 40, and the other of the front backrest connecting rod 21 and the limiting rod 24 is hinged to the driving plate 23. By using the above limiting member, the driving plate 23 can be used to achieve a driving effect to drive the front backrest connecting rod 21 and the rear backrest connecting rod 22 to move, and the limiting rod 24 can be used to achieve a limiting effect to limit the movement trajectory of the front backrest connecting rod 21, thereby limiting the movement trajectory of the backrest mounting plate 10 through the front backrest connecting rod 21.

In other embodiments, the movement trajectory of the rear backrest connecting rod 22 can also be limited to limit the movement trajectory of the backrest mounting plate 10.

In this embodiment, the limiting end of the driving plate 23 means that when the backrest mechanism 60 is applied to the seat bracket, the driving plate 23 can be hinged to the mounting base by parts to limit the movement trajectory of the driving plate 23, so that the driving plate 23 can rotate relative to the seat frame mounting member 40. Specifically, the limiting end may be a hinge hole.

As shown in FIG. 3, the upper end of the limiting rod 24 is hinged to the middle of the front backrest connecting rod 21, the lower end of the limiting rod 24 is hinged to the seat frame mounting member 40, and the rear end of the front backrest connecting rod 21 is hinged to the driving plate 23. By using the above arrangement manner, the connecting structure is simple, and the movement is more reliable. In this embodiment, the backrest mounting plate 10, the front backrest connecting rod 21, the rear backrest connecting rod 22 and the driving plate 23 together form a first four-bar linkage mechanism. Through the deformation of the first four-bar linkage mechanism, the backrest mounting plate 10 can tilt backward. The front backrest connecting rod 21, the driving plate 23, the seat frame mounting member 40 and the limiting rod 24 together form a second four-bar linkage mechanism. Through the deformation of the second four-bar linkage mechanism, the backrest mounting plate 10 can move forward. As shown in FIG. 1, the front backrest connecting rod 21 and the rear backrest connecting rod 22 are arranged crosswise, and the rear end of the front backrest connecting rod 21 is located behind the lower end of the rear backrest connecting rod 22. By using the above structure, the movement trajectory of the backrest mounting plate 10 is more flexible.

In this embodiment, the front backrest connecting rod 21 and the rear backrest connecting rod 22 do not have a direct connecting structure, but only form a staggered spatial structure.

As shown in FIG. 1 and FIG. 3, when the backrest mounting plate 10 is located at the folding position, the upper end of the rear backrest connecting rod 22 is located behind the lower end of the rear backrest connecting rod 22, and when the backrest mounting plate 10 is located at the unfolding position, the upper end of the rear backrest connecting rod 22 is located in front of the lower end of the rear backrest connecting rod 22. Through the change of the movement trajectory of the rear backrest connecting rod 22 as described above, it is possible to adapt to the distance generated by the forward movement of the backrest mounting plate 10 under the driving of the second four-bar linkage mechanism, and also to drive the backrest mounting plate 10 to tilt backward with a suitable backward tilting angle.

As shown in FIG. 4, the front end of the front backrest connecting rod 21 is hinged to the front end of the backrest mounting plate 10 at a first hinge point O, the upper end of the rear backrest connecting rod 22 is hinged to the rear end of the backrest mounting plate 10 at a second hinge point E, the lower end of the rear backrest connecting rod 22 is hinged to the driving plate 23 at a third hinge point C, a connecting line between the first hinge point O and the second hinge point E is a connecting line L1, a connecting line between the second hinge point E and the third hinge point C is a connecting line L2, an included angle between the connecting line L1 and the connecting line L2 is an included angle α, and when the backrest mounting plate 10 is located at the unfolding position, the included angle α is 40°-135°. By using the above value range, the angle is more reasonable and will not be too large or too small, and the force between adjacent connecting rods is better and more reasonable, which is conducive to improving the support performance and the carrying capacity, and also conducive to improving the movement smoothness of the seat bracket.

Preferably, the included angle α is 68°-128°.

As shown in FIG. 1, the rear end of the backrest mounting plate 10 is provided with a convex part 11, the second hinge point E is arranged at the convex part 11, and the convex part 11 is tilted upward. By the above arrangement, the second hinge point E can be set upward by a certain distance, so that the included angle α is not too large and is within a reasonable range.

The convex part 11 is tilted upward, meaning that a certain included angle is formed between an outer wall of the convex part 11 and an outer wall of the backrest mounting plate 10, and the outer wall of the convex part 11 extends upward.

As shown in FIG. 4, the front end of the front backrest connecting rod 21 is hinged to the front end of the backrest mounting plate 10 at the first hinge point O, the rear end of the front backrest connecting rod 21 is hinged to the driving plate 23 at a fourth hinge point B, the limiting end of the driving plate 23 is a fifth hinge point D, a connecting line between the first hinge point O and the fourth hinge point B is a connecting line L3, a connecting line between the fourth hinge point B and the fifth hinge point D is a connecting line L4, an included angle between the connecting line L3 and the connecting line L4 is an included angle β, and when the backrest mounting plate 10 is located at the unfolding position, the included angle β is 40°-135°. By using the above value range, the angle is more reasonable and will not be too large or too small, and the force between adjacent connecting rods is better and more reasonable, which is conducive to improving the support performance and the carrying capacity, and also conducive to improving the movement smoothness of the seat bracket.

Preferably, the included angle β is 68°-128°.

By enabling both the included angle α and the included angle β to be within a reasonable range, when the backrest mounting plate 10 is located at the unfolding position, the force between connecting rods for carrying the front end and rear end of the backrest mounting plate 10 is more reasonable.

As shown in FIG. 5, the seat frame mounting member 40 is hinged to the driving plate 23 at a sixth hinge point A, a connecting line between the third hinge point C and the fourth hinge point B is a connecting line L5, a connecting line between the fourth hinge point B and the sixth hinge point A is a connecting line L6, and the size of the connecting line L5 is greater than the size of the connecting line L6. By using the above size setting, the rear end of the front backrest connecting rod 21 and the lower end of the rear backrest connecting rod 22 have a suitable distance, so that during the movement of the driving plate 23, the front backrest connecting rod 21 and the rear backrest connecting rod 22 have a suitable movement route.

A ratio of the size of the connecting line L5 to the size of the connecting line L6 is 1.71-2.55. By using the above ratio range, the rear end of the front backrest connecting rod 21 and the lower end of the rear backrest connecting rod 22 have a suitable distance.

The ratio of the size of the connecting line L5 to the size of the connecting line L6 may be 1.71, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.55, and any value between 1.71 and 2.55.

As shown in FIG. 5, a connecting line between the fourth hinge point B and the sixth hinge point A is a connecting line L6, a connecting line between the third hinge point C and the sixth hinge point A is a connecting line L7, and the size of the connecting line L6 is less than the size of the connecting line L7. By using the above size setting, the rear end of the front backrest connecting rod 21 and the lower end of the rear backrest connecting rod 22 both have a suitable distance from the center of rotation, so that during the movement of the driving plate 23, the front backrest connecting rod 21 and the rear backrest connecting rod 22 have a suitable movement route.

A ratio of the size of the connecting line L7 to the size of the connecting line L6 is 1.46-2.18. By using the above ratio range, the rear end of the front backrest connecting rod 21 and the lower end of the rear backrest connecting rod 22 both have a suitable distance from the center of rotation.

The ratio of the size of the connecting line L7 to the size of the connecting line L6 may be 1.46, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.18, and any value between 1.46 and 2.18.

In an embodiment, when the backrest mounting plate 10 is switched from the folding position to the unfolding position, the front end of the backrest mounting plate 10 moves forward and moves downward. Through the above movement trajectory, the front end of the backrest mounting plate 10 can move forward relative to the seat frame mounting member, so that a sofa with the backrest can achieve the zero wall leaning function. Furthermore, due to the downward movement, when the sofa changes to a lying posture, the height of the backrest is reduced, and the backrest is closer to the ground, so that the comfort of the user when lying down can be improved.

When the seat bracket is switched among a sitting posture, a TV posture and a lying posture, a distance between the backrest mounting plate 10 of the backrest mechanism 60 and a preset vertical plane is greater than or equal to 0. Specifically, when the seat bracket is in the sitting posture, the distance between the backrest mounting plate 10 and the preset vertical plane is equal to 0. When the seat bracket is in the TV posture, the distance between the backrest mounting plate 10 and the preset vertical plane is greater than 0. When the seat bracket is in the lying posture, the distance between the backrest mounting plate 10 and the preset vertical plane is equal to 0. The interference between the backrest and the wall is avoided to achieve the zero wall leaning function of the sofa.

When the backrest mounting plate 10 is switched from the folding position to the unfolding position, the rotation angle of the backrest mounting plate 10 relative to the seat frame mounting component 40 is 24°-40°. By using the above angle range, the backrest mounting plate 10 can have a suitable backward tilting angle.

The rotation angle of the backrest mounting plate 10 relative to the seat frame mounting member 40 may be 24°, 25°, 28°, 30°, 32°, 35°, 38°, 40°, and any value between 24° and 40°.

When the rotation angle of the backrest mounting plate 10 relative to the seat frame mounting member 40 is 25°-35°, the backward tilting angle of the backrest mounting plate 10 makes the user feel more comfortable. Preferably, the rotation angle is 32°.

As shown in FIG. 1 and FIG. 3, when the backrest mounting plate 10 is located at the folding position, the hinge point between the seat frame mounting member 40 and the driving plate 23 is located in front of the rear end of the front backrest connecting rod 21, and when the backrest mounting plate 10 is located at the unfolding position, the hinge point between the seat frame mounting member 40 and the driving plate 23 is located behind the rear end of the front backrest connecting rod 21. Through the above arrangement, the hinge point of the driving plate 23 swings in a fan-shaped path from back to front, so that the front backrest connecting rod 21 has a suitable movement trajectory, and then the backrest mounting plate 10 moves forward.

In an embodiment, by applying an external acting force to the limiting end of the driving plate 23, the driving plate 23 rotates relative to the seat frame mounting member 40. Thus, through the first four-bar linkage mechanism formed by the backrest mounting plate 10, the front backrest connecting rod 21, the rear backrest connecting rod 22 and the driving plate 23, the front backrest connecting rod 21 moves upward and the rear backrest connecting rod 22 moves downward, so that the front end of the backrest mounting plate 10 moves upward and the rear end of the backrest mounting plate 10 moves downward to achieve the backward tilting of the backrest mounting plate 10. In addition, through the second four-bar linkage mechanism formed by the front backrest connecting rod 21, the driving plate 23, the seat frame mounting member 40 and the limiting rod 24, the front backrest connecting rod 21 moves forward to drive the backrest mounting plate 10 to move forward.

As shown in FIG. 6 to FIG. 12, another embodiment of this disclosure provides a seat bracket. The seat bracket includes a mounting base fixed relative to the ground, a seat frame mounting member 40, a footrest mechanism 50 and a backrest mechanism 60. The seat frame mounting member 40 is movably connected to the mounting base, and the seat frame mounting member 40 can move relative to the mounting base. The footrest mechanism 50 is hinged to the front end of the seat frame mounting member 40. The driving plate 23 of the backrest mechanism 60 is respectively hinged to the mounting base and the seat frame mounting member 40, and the backrest mechanism 60 is the backrest mechanism 60 provided above. By using the above seat bracket, an external acting force can be applied to the limiting end of the driving member to enable the driving member to rotate relative to the seat frame mounting member 40. The front backrest connecting rod 21 and the rear backrest connecting rod 22 are hinged to the seat frame mounting member 40 by the driving member, so that the driving member can drive the front backrest connecting rod 21 and the rear backrest connecting rod 22 to move, the front end of the front backrest connecting rod 21 can drive the front end of the backrest mounting plate 10 to move, and the upper end of the rear backrest connecting rod 22 can drive the rear end of the backrest mounting plate 10 to move. Therefore, the backrest mounting plate 10 can move relative to the seat frame mounting member 40, and the relative position between the backrest mounting plate 10 and the seat frame mounting member 40 is more flexible. When the backrest mounting plate 10 is switched from the folding position to the unfolding position, the backrest mounting plate 10 can move forward a greater distance relative to the seat frame mounting member 40, so as to solve the problem of interference between a backrest and a wall, thereby achieving the zero wall leaning function of the sofa. Moreover, because the front backrest connecting rod 21 and the rear backrest connecting rod 22 are both hinged to the driving member, during the movement of the backrest mounting plate 10, the linkage performance between connecting rods is enhanced, so as to enhance the carrying capacity, stability and movement smoothness of the sofa.

The footrest mechanism 50 has an extending position for extending the footrest mechanism 50 relative to the seat frame mounting member 40 and a retracting position for retracting the footrest mechanism 50 relative to the seat frame mounting member 40. The lying posture of the seat bracket corresponds to the footrest mechanism 50 located at the extending position and the backrest mounting plate 10 located at the unfolding position, the TV posture of the seat bracket corresponds to the footrest mechanism 50 located at the extending position and the backrest mounting plate 10 located at the folding position, and the sitting posture of the seat bracket corresponds to the footrest mechanism 50 located at the retracting position and the backrest mounting plate 10 located at the folding position.

It should be noted that the mounting base may be of a floor-standing bracket structure.

Specifically, the seat frame mounting member 40 includes a seat frame and a seat frame connecting plate connected to the rear end of the seat frame, the mounting surface of the seat frame mounting member 40 is arranged on the seat frame, and the driving plate 23 and the limiting rod 24 are respectively hinged to the seat frame connecting plate. The seat frame connecting plate and the seat frame may be integrally formed, or the seat frame connecting plate may be connected to the seat frame by bolts or rivets.

In some embodiments, the mounting base is an armrest mounting plate 30, the seat bracket further includes a suspension assembly 70 and a movable assembly 80, the suspension assembly 70 is arranged on the seat frame mounting member 40 in a swinging manner, and the front end and the rear end of the suspension assembly 70 are movably connected to the armrest mounting plate 30 respectively by the movable assembly 80. By using the above structure, the suspension assembly 70 and the movable assembly 80 can be used to achieve the relative movement between the seat frame mounting member 40 and the armrest mounting plate 30.

As shown in FIG. 12, a distance K1 between a lower surface of the armrest mounting plate 30 and the ground is 11 cm-17 cm. By using the above size, a certain space is reserved between the armrest mounting plate 30 and the ground, thereby achieving a high foot function of the seat bracket.

The distance K1 between the lower surface of the armrest mounting plate 30 and the ground may be 11 cm, 12 cm, 13 cm, 14 cm, 15 cm, 16 cm, 17 cm, and any value between 11 cm and 17 cm. Preferably, K1 is 12 cm-14 cm.

As shown in FIG. 6 and FIG. 10, the suspension assembly 70 includes a front swing rod 71, a transition swing rod 72 and a rear swing rod 73, the upper end of the front swing rod 71 and the upper end of the rear swing rod 73 are respectively hinged to the seat frame mounting member 40, the lower end of the front swing rod 71 and the lower end of the rear swing rod 73 are respectively hinged to the transition swing rod 72, and the front end and the rear end of the transition swing rod 72 are movably connected to the armrest mounting plate 30 respectively by the movable assembly 80. By using the above suspension assembly 70, the relative swing between the seat frame mounting member 40 and the transition swing rod 72 can be achieved by the swing of the front swing rod 71 and the rear swing rod 73, and the relative swing between the transition swing rod 72 and the armrest mounting plate 30 can be achieved by the movable assembly 80.

As shown in FIG. 6, the movable assembly 80 includes a slide rail 81 and a pulley slidably arranged in the slide rail 81, one of the pulley and the slide rail 81 is arranged on the suspension assembly 70, and the other of the pulley and the slide rail 81 is arranged on the armrest mounting plate 30. By using the above movable assembly 80, the relative movement between the suspension assembly 70 and the armrest mounting plate 30 can be achieved by the slide of the pulley in the slide rail 81, so as to achieve the relative movement between the seat frame mounting member 40 and the armrest mounting plate 30.

In this embodiment, the pulley is arranged on the transition swing rod 72, and the slide rail 81 is fixedly arranged on the armrest mounting plate 30.

As shown in FIG. 7, the movable assembly 80 includes a first connecting rod 83, a second connecting rod 84 and a third connecting rod 85, the lower end of the first connecting rod 83 and the lower end of the second connecting rod 84 are respectively hinged to the armrest mounting plate 30, the upper end of the first connecting rod 83 is hinged to the middle of the third connecting rod 85, the upper end of the second connecting rod 84 is hinged to the rear end of the third connecting rod 85, and the front end of the third connecting rod 85 is hinged to the suspension assembly 70. By using the above movable assembly 80, the first connecting rod 83 and the second connecting rod 84 can rotate relative to the armrest mounting plate 30 to drive the third connecting rod 85 to move relative to the armrest mounting plate 30, so as to achieve the relative movement between the suspension assembly 70 and the armrest mounting plate 30, thereby achieving the relative movement between the seat frame mounting member 40 and the armrest mounting plate 30.

In this embodiment, the third connecting rod 85 is hinged to the rear end of the transition swing rod 72.

In some embodiments, the front end of the suspension assembly 70 is movably connected to the armrest mounting plate 30 by the movable assembly 80 with the pulley and slide rail structure, and the rear end of the suspension assembly 70 is movably connected to the armrest mounting plate 30 by the movable assembly 80 with the connecting rod structure. The front end structure of the seat bracket is more compact, which is conducive to reducing the overall thickness of the seat bracket, thereby achieving a larger space under the armrest mounting plate 30 without changing the height of the seat frame mounting member 40 to achieve true high feet.

It should be noted that the front end and rear end of the suspension assembly 70 can be movably connected to the armrest mounting plate 30 simultaneously by the movable assembly 80 with the pulley and slide rail structure; or the front end and rear end of the suspension assembly 70 can be movably connected to the armrest mounting plate 30 simultaneously by the movable assembly 80 with the connecting rod structure; or the front end of the suspension assembly 70 is movably connected to the armrest mounting plate 30 by the movable assembly 80 with the connecting rod structure, and the rear end of the suspension assembly 70 is movably connected to the armrest mounting plate 30 by the movable assembly 80 with the pulley and slide rail structure.

In some embodiments, the movable assembly 80 with a three-link structure can be basically hidden in a projection area of the backrest mechanism, thereby reducing the compression and interference on a cushion mounted on the seat frame mounting member.

As shown in FIG. 6 and FIG. 7, the seat bracket further includes a front driving rod 92 and a rear driving rod 93, the front end of the front driving rod 92 is hinged to the footrest mechanism 50, the rear end of the front driving rod 92 is hinged to the suspension assembly 70, the upper end of the rear driving rod 93 is hinged to the limiting end of the driving plate 23, and the lower end of the rear driving rod 93 is hinged to the armrest mounting plate 30. The suspension assembly 70 and the footrest mechanism 50 can be linked by the front driving rod 92, and the driving plate 23 and the armrest mounting plate 30 can be movably connected by the rear driving rod 93 to limit the driving plate 23, so that the driving plate 23 can rotate relative to the seat frame mounting member 40.

In this embodiment, the rear end of the front driving rod 92 is hinged to the middle of the rear swing rod 73.

As shown in FIG. 6, the footrest mechanism 50 includes a footrest driving plate 51, an inner footrest plate 52, an outer footrest plate 53, a rear footrest plate 54, a first front footrest connecting rod 55, a second front footrest connecting rod 56, a front footrest plate 57, a front footrest 58 and a rear footrest 59. The rear end of the footrest driving plate 51 is hinged to the front end of the front driving rod 92, the middle of the footrest driving plate 51 is hinged to the seat frame mounting member 40, the front end of the footrest driving plate 51 is hinged to the rear end of the outer footrest plate 53, the middle of the outer footrest plate 53 is hinged to the middle of the inner footrest plate 52, the front end of the outer footrest plate 53 is hinged to the rear end of the first front footrest connecting rod 55, the middle of the first front footrest connecting rod 55 is hinged to the middle of the rear footrest plate 54, the front end of the first front footrest connecting rod 55 is hinged to the rear end of the second front footrest connecting rod 56, the middle of the second front footrest connecting rod 56 is hinged to the middle of the rear footrest 59, the front end of the second front footrest connecting rod 56 is hinged to the rear end of the front footrest 58, the rear end of the front footrest plate 57 is hinged to the front end of the rear footrest 59, the front end of the front footrest plate 57 is hinged to the front end of the front footrest 58, the front end of the rear footrest plate 54 is hinged to the rear end of the rear footrest 59, the rear end of the rear footrest plate 54 is hinged to the front end of the inner footrest plate 52, and the rear end of the inner footrest plate 52 is hinged to the seat frame mounting member 40, wherein the outer footrest plate 53 is provided with a limiting button 531, and after the footrest mechanism 50 is unfolded, the limiting button 531 is attached to the inner footrest plate 52.

In some embodiment, the footrest mechanism 50 has a plurality of four-bar linkage mechanisms, wherein the footrest driving plate 51, the seat frame mounting member 40, the inner footrest plate 52 and the outer footrest plate 53 form a four-bar linkage mechanism, the inner footrest plate 52, the outer footrest plate 53, the rear footrest plate 54 and the first front footrest connecting rod 55 form a four-bar linkage mechanism, the rear footrest plate 54, the first front footrest connecting rod 55, the second front footrest connecting rod 56 and the rear footrest 59 form a four-bar linkage mechanism, and the second front footrest connecting rod 56, the front footrest plate 57, the front footrest 58 and the rear footrest 59 form a four-bar linkage mechanism. By driving one component of the footrest mechanism 50 to act, a plurality of four-bar linkage mechanisms can be deformed to unfold or retract the footrest mechanism 50.

The footrest mechanism 50 of this disclosure is composed of six connecting rods. Compared with four connecting rods in the prior art, the arrangement of the six connecting rods can correspondingly shorten the length of each connecting rod, so that when the footrest mechanism is in a retracting state, the thickness in the vertical space decreases, which is also conducive to reducing the overall thickness of an iron frame and conducive to achieving true high feet.

In other embodiments, the limiting button 531 may be arranged at other positions, such as abutting against the connecting rod of the suspension assembly 70, or at both positions, so as to also limit the excessive extension of the footrest mechanism 50.

As shown in FIG. 9, the seat bracket further includes a linear driver, a front driving tube 90 and a rear driving tube 91. The front driving tube 90 and the rear driving tube 91 are arranged at an interval along forward and backward directions, the front driving tube 90 is connected to the footrest mechanism 50, the rear driving tube 91 is connected to the rear end of the armrest mounting plate 30, and the linear driver is pivotally connected between the front driving tube 90 and the rear driving tube 91. The linear driver can be used to change the distance between the front driving tube 90 and the rear driving tube 91 and generate relative rotation to unfold the footrest mechanism 50, and then, the front driving rod 92, the suspension assembly 70, the movable assembly 80 and the rear driving rod 93 cooperate to achieve the backward tilting of the backrest mounting plate 10.

The front driving tube 90 is connected to the inner footrest plate 52.

Specifically, in some embodiment, under the driving of the linear driver, the distance between the front driving tube 90 and the rear driving tube 91 increases, the front driving tube 90 rotates, the front driving tube 90 drives the inner footrest plate 52 to rotate relative to the seat frame mounting member, and then, the plurality of four-bar linkage mechanisms formed by the footrest mechanism 50 drive the front footrest 58 and the rear footrest 59 to be unfolded. After the footrest mechanism 50 is unfolded in place, the limiting button 531 is attached to the inner footrest plate 52 to limit the further action of the footrest mechanism 50. Then, due to the driving of the linear driver, the distance between the front driving tube 90 and the rear driving tube 91 continues to increase, and the footrest mechanism 50 drives the seat frame mounting member 40 to move forward by the footrest driving plate 51 and the inner footrest plate 52. Moreover, the seat frame mounting member 40 drives the rear swing rod 73 to move by through the front driving rod 92, the rear swing rod 73 drives the transition swing rod 72 to move forward, the pulley of the transition swing rod 72 slides in the slide rail 81 and slides to the upper end of the slide rail 81 from the lower end of the slide rail 81, and the rear end of the transition swing rod 72 drives the third connecting rod 85 to move forward. Moreover, the slide rail 81 is obliquely arranged upward, and the angle of the seat frame mounting member 40 is slightly changed. Moreover, during the forward movement of the seat frame mounting member 40, the seat frame mounting member 40 drives the driving plate 23 to move forward. During the forward movement of the driving plate 23, due to the limitation of the rear driving rod 93, the driving plate 23 rotates relative to the seat frame mounting member 40. Thus, through the first four-bar linkage mechanism formed by the backrest mounting plate 10, the front backrest connecting rod 21, the rear backrest connecting rod 22 and the driving plate 23, the front backrest connecting rod 21 moves upward and the rear backrest connecting rod 22 moves downward, so that the front end of the backrest mounting plate 10 moves upward and the rear end of the backrest mounting plate 10 moves downward to achieve the backward tilting of the backrest mounting plate 10. In addition, through the second four-bar linkage mechanism formed by the front backrest connecting rod 21, the driving plate 23, the seat frame mounting member 40 and the limiting rod 24, the front backrest connecting rod 21 moves forward to drive the backrest mounting plate 10 to move forward. The interference between the backrest and the wall is avoided to achieve the zero wall leaning function of the sofa.

In some embodiment, when the sofa is switched among the lying posture, the TV posture and the sitting posture, the distance between the upper end of the backrest and the wall is 0-4.6 cm. When the sofa is in the sitting posture, the distance between the upper end of the backrest and the wall is 0; when the sofa is in the TV posture, the distance between the upper end of the backrest and the wall is switched from 0 to 4.6 cm; and when the sofa is in the lying posture, the distance between the upper end of the backrest and the wall is switched from 4.6 cm to 0.

When the backrest mounting plate 10 of the backrest mechanism 60 is switched from the folding position to the unfolding position, the front end of the backrest mounting plate 10 first moves downward and then moves upward.

In some embodiments, a motor side of the linear driver is located on a side close to the front driving tube 90, thereby reducing the interference of the motor side of the linear driver to the space below the armrest mounting plate during operation.

In some embodiment, when the backrest mounting plate 10 of the backrest mechanism 60 is switched from the folding position to the unfolding position, the rotation angle of the backrest mounting plate 10 relative to the seat frame mounting member 40 is 25°-38°. By using the above angle range, the backrest mechanism 60 has a suitable backward tilting angle.

The rotation angle of the backrest mounting plate 10 relative to the seat frame mounting member 40 may be 25°, 28°, 30°, 33°, 36°, and any value between 25° and 38°.

As shown in FIG. 13 to FIG. 15, some embodiment of this disclosure provides a seat bracket. The seat bracket in this embodiment differs from the seat bracket in above embodiments in that in this embodiment, the suspension assembly 70 is movably connected to the armrest mounting plate 30 by an auxiliary swing assembly 100. The auxiliary swing assembly 100 includes a front swing auxiliary rod 101, a transition swing auxiliary rod 102 and a rear swing auxiliary rod 103. The upper end of the front swing auxiliary rod 101 is hinged to the middle of the transition swing rod, the lower end of the front swing auxiliary rod 101 is hinged to the front end of the armrest mounting plate, the front end of the transition swing auxiliary rod 102 is hinged to the middle of the front swing auxiliary rod 101, the rear end of the transition swing auxiliary rod 102 is hinged to the upper end of the rear swing auxiliary rod 103, the middle of the rear swing auxiliary rod 103 is hinged to the rear end of the transition swing rod, and the lower end of the rear swing auxiliary rod 103 is hinged to the rear end of the armrest mounting plate. By using the above auxiliary swing assembly 100, when the seat frame mounting member 40 moves forward, the front driving rod 92 can drive the transition swing rod 72 to move forward, and the transition swing rod 72 moves relative to the armrest mounting plate 30 by the front swing auxiliary rod 101 and the rear swing auxiliary rod 103.

In some embodiments, the rear end of the front driving rod 92 is hinged to the middle of the transition swing rod 72.

In some embodiments, because the seat bracket also uses the backrest mechanism in above embodiments, when the backrest mounting plate 10 is switched from the folding position to the unfolding position, the backrest mounting plate 10 can move forward a greater distance relative to the seat frame mounting member 40, thereby solving the problem of interference between the backrest and the wall, and achieving the zero wall leaning function of the sofa.

As shown in FIG. 14 and FIG. 15, the auxiliary swing assembly 100 further includes a first swing connecting rod 104 and a second swing connecting rod 105. The front end of the first swing connecting rod 104 is hinged to the front end of the transition swing rod, the rear end of the first swing connecting rod 104 is hinged to the middle of the front swing auxiliary rod 101, the front end of the second swing connecting rod 105 is hinged to the upper end of the front swing auxiliary rod 101, and the rear end of the second swing connecting rod 105 is hinged to the middle of the transition swing rod. The first swing connecting rod 104 and the second swing connecting rod 105 can be used to limit the movement trajectory of the front swing auxiliary rod 101, thereby limiting the movement size of the seat frame mounting member 40 relative to the armrest mounting plate 30.

As shown in FIG. 14 and FIG. 15, the auxiliary swing assembly 100 further includes a third swing connecting rod 106 and a fixed connecting rod 107. The lower end of the third swing connecting rod 106 is hinged to the rear end of the transition swing rod, the upper end of the third swing connecting rod 106 is hinged to the middle of the rear swing auxiliary rod 103, the upper end of the fixed connecting rod 107 is fixedly connected with the armrest mounting plate 30, and the lower end of the fixed connecting rod 107 is hinged to the lower end of the rear swing auxiliary rod 103. The third swing connecting rod 106 and the fixed connecting rod 107 can be used to limit the movement trajectory of the rear swing auxiliary rod 103, thereby limiting the movement size of the seat frame mounting member 40 relative to the armrest mounting plate 30.

In some embodiments, when the backrest mounting plate 10 of the backrest mechanism 60 is located at the unfolding position, the included angle γ between the mounting surface of the seat frame mounting member 40 and the horizontal plane is 13°-30°. By using the above angle range, the seat frame mounting member 40 has a larger lifting angle.

The included angle γ between the mounting surface of the seat frame mounting member 40 and the horizontal plane may be 13°, 15°, 18°, 20°, 23°, 26°, 28°, 30°, and any value between 13° and 30°.

In some embodiments, when the backrest mounting plate 10 of the backrest mechanism 60 is located at the unfolding position, the included angle δ between the backrest mounting plate 10 and the horizontal plane is 20°-30°. By using the above angle range, the backrest mounting plate 10 has a larger backward tilting angle.

The included angle δ between the backrest mounting plate 10 and the horizontal plane may be 20°, 23°, 25°, 28°, 30°, and any value between 20° and 30°.

The included angle between the backrest mounting plate 10 and the horizontal plane refers to an included angle between a central line of the backrest mounting plate 10 and the horizontal plane.

As shown in FIG. 13, when the backrest mounting plate 10 of the backrest mechanism 60 is located at the unfolding position, a vertical distance K2 between the highest point of the footrest mechanism 50 and the highest point of the backrest mounting plate 10 is 260 mm-380 mm. By using the above size range, when the seat bracket in the lying posture state is used by a user, the knees are almost flush with the chest to achieve zero gravity experience.

The vertical distance K2 between the highest point of the footrest mechanism 50 and the highest point of the backrest mounting plate 10 may be 260 mm, 280 mm, 300 mm, 310 mm, 330 mm, 350 mm, 380 mm, and any value between 260 mm and 380 mm.

In the prior art, a push rod motor is arranged obliquely, and the motor side faces upward and is connected to one side of a pedal mechanism or a headrest to drive an iron frame of a suspension assembly to switch among different postures. Due to relatively compact and thin overall design of an iron frame of a sofa, the distance between the topmost end of a seat frame surface and the bottommost end of an armrest mounting plate is relatively small, resulting in too close distance between the push rod motor and the seat frame surface. After the sofa is mounted in a final form, during use, especially when the user sits down, the user is easy to touch the push rod motor, which not only affects the comfort of the user, but also may cause damage to the push rod motor, so as to reduce the service life and reliability of the push rod motor and generate a negative effect on the user experience.

To solve the problem of poor user experience caused by too close distance between the push rod motor of the iron frame of the sofa and the seat frame surface in the prior art, this disclosure provides a driving mechanism, a seat bracket and a movable sofa with the same.

Referring to FIG. 16 to FIG. 27, according to one aspect of the technical solution of this disclosure, a driving mechanism is provided. The driving mechanism is used for a seat bracket. The seat bracket includes a mounting base 1-10 and a seat frame mounting member 40 movably connected to the mounting base 1-10. Two ends of the seat frame mounting member 40 are respectively provided with a footrest mechanism 50 and a backrest mechanism 60 in an extensile or retractable manner, so that position postures of the seat bracket include a sitting posture state, a leisure posture state and a lying posture state. The driving mechanism 1-60 includes a driving body 61 and a transmission component 62. The driving body 61 is connected to the mounting base 1-10 and located at an end close to the backrest mechanism 60, and at least part of the driving body 61 is movably arranged along a horizontal direction. The transmission component 62 is connected to at least part of the driving body 61 and the footrest mechanism 50 respectively to drive the transmission component 62 to move through at least part of the driving body 61, so as to switch the seat bracket among the sitting posture state, the leisure posture state and the lying posture state, wherein the position of the lowest point of the transmission component 62 is higher than the position of the lowest point of the driving body 61.

By using the technical solution of this disclosure, the driving body 61 moves along a horizontal direction, so that the transmission component 62 transmits the driving force from the driving body 61 to drive the footrest mechanism 50 to perform an extension or retraction movement. Compared with a traditional arrangement manner of a push rod motor, it is not simple linear push-pull. In this disclosure, the driving body 61 always moves along the horizontal direction, and the position of the lowest point of the transmission component 62 is always higher than the position of the lowest point of the driving body 61, so that when the position posture of the seat bracket changes, the transmission component 62 indirectly drives the footrest mechanism 50 to move, and the driving body 61 or an extended part thereof will never be too close to the seat frame surface, or even collide with the seat frame surface, so as to avoid the potential safety hazard that the user may touch the driving body 61 during use, thereby solving the problem of poor user experience caused by too close distance between the push rod motor of the iron frame of the sofa and the seat frame surface in the prior art.

In this embodiment, the driving body 61 includes a guide rail 610, a guide member 611 and a motor component 612. The guide rail 610 is arranged in an extending manner along a horizontal direction. The guide member 611 is slidably arranged on the guide rail 610, and two ends of the transmission component 62 are respectively connected to the guide member 611 and the footrest mechanism 50. The motor component 612 is in driving connection with the guide member 611 to drive the guide member 611 to drive the transmission component 62 to move along an extension direction of the guide rail 610. The guide member 611 is a slide block.

By using the guide rail 610 as a movement track of the guide member 611, the guide member 611 can stably slide along a horizontal direction. In addition, under the power of the guide member 611, the transmission component 62 drives the footrest mechanism 50 to extend or retract stably and smoothly. After the seat bracket is switched to any position posture state, during use by the user, the motor component 612 will never be close to the seat frame surface, so as to avoid the user from easily touching the driving body 61 when sitting down, which affects the experience of the user, thereby effectively avoiding the risk of injury and improving the comfort and reliability of operating the iron frame of the sofa. In this disclosure, the motor component 612 can be selectively arranged at both ends of the guide rail 610, so as to drive the guide member 611 to move on the guide rail 610 along an extension direction thereof.

In this embodiment, the transmission component 62 includes a transmission rod 620 and a front driving tube 90. One end of the transmission rod 620 is hinged to at least part of the driving body 61. The front driving tube 90 extends along a horizontal direction and is perpendicular to the transmission rod 620. The other end of the transmission rod 620 is hinged to the front driving tube 90, and one end of the front driving tube 90 is connected to the footrest mechanism 50.

In this way, the guide rail 610 provides a stable trajectory for linear drive, and the guide member 611 slides along the guide rail 610. Under the action of the two transmission rods 620 and the front driving tube 90, it is ensured that the linear driving force of the driving body 61 along the horizontal direction can be accurately transmitted to the footrest mechanism 50, thereby smoothly driving the footrest mechanism 50 to perform extension and retraction movements to switch the seat bracket among the sitting posture state, the TV (leisure) posture state and the lying posture state. Compared with the traditional push rod motor design, in this disclosure, the arrangement of the transmission component 62 avoids the safety problem of the user touching the driving body 61 during use after the position posture of the seat bracket changes, thereby greatly improving the use experience of the user.

Specifically, at least one transmission rod 620 is provided, the transmission component 62 further includes a shielding plate 622, and the shielding plate 622 is connected to the at least one transmission rod 620 or the front driving tube 90. The seat frame mounting member 40 has a support surface for carrying a user, and a top surface of the shielding plate 622 is arranged close to the support surface, so as to support the user. By the above arrangement, when the seat bracket is in the sitting posture state, the shielding plate 622 is located at the position of the highest point of the transmission component 62 and is in contact with the support surface on the seat frame mounting member 40, so as to provide additional support and stability to the user when the user sits on the support surface and also play a role in shielding the two transmission rods 620, thereby preventing the internal transmission component 62 from being disturbed by external factors and reducing the risk of damage caused by an external force acting on the transmission component 62, so as to prolong the service life of the driving mechanism 1-60.

Optionally, in an embodiment of the shielding plate 622, the shielding plate 622 is connected to at least one transmission rod 620, wherein two transmission rods 620 are provided, and the shielding plate 622 is respectively fixed on the two transmission rods 620.

Optionally, in another embodiment of the shielding plate 622, the shielding plate 622 is connected to the front driving tube 90, wherein one end of the shielding plate 622 is hinged to the front driving tube 90, and the other end of the shielding plate 622 is slidably connected to at least one transmission rod 620 respectively. When the driving mechanism 1-60 drives the seat bracket to be switched from the sitting posture state to the leisure posture state, one end of the shielding plate 622 rotates relative to the front driving tube 90, and the other end of the shielding plate 622 slides along an extension direction of the transmission rod 620, so that the shielding plate 622 is located at the position of the highest point of the transmission component 62 and is in contact with the support surface on the seat frame mounting member 40, so as to provide additional support to the user.

According to one aspect of this disclosure, another driving mechanism is provided. The driving mechanism is used for a seat bracket. The seat bracket includes a mounting base 1-10 and a seat frame mounting member 40 movably connected to the mounting base 1-10. Two ends of the seat frame mounting member 40 are respectively provided with a footrest mechanism 50 and a backrest mechanism 60 in an extensile or retractable manner, so that position postures of the seat bracket include a sitting posture state, a leisure posture state and a lying posture state. The driving mechanism 1-60 includes a driving component 63 and a movable component 64. The driving component 63 is connected to the mounting base 1-10 and located at an end close to the backrest mechanism 60, and the driving end of the driving component 63 is movably arranged along a direction inclined to the horizontal plane. The movable component 64 is connected to the driving end of the driving component 63 and the footrest mechanism 50 respectively, and at least part of the movable component 64 is movably arranged along a direction inclined to the horizontal plane to drive the movable component 64 to move through the driving component 63, so as to switch the seat bracket among the sitting posture state, the leisure posture state and the lying posture state. The driving component 63 and the movable component 64 extend along the direction inclined to the horizontal plane in a same straight line, and the driving component 63 is located below the movable component 64.

In this embodiment, the driving component is a traditional push rod motor. A traditional motor side is arranged above and connected to one side of the footrest mechanism 50 or the backrest mechanism 60 to drive the iron frame of the suspension assembly 70 to switch among different position postures, resulting in too close distance between the motor side of the push rod motor and the seat frame surface. After the sofa is mounted in a final form, during use, especially when the user sits down, the user is easy to touch the motor side of the push rod motor, which not only affects the comfort of the user, but also may cause damage to the push rod motor, so as to reduce the service life and reliability of the push rod motor. In this embodiment, the motor side of the push rod motor is arranged below and connected to one side of the footrest mechanism 50 or the backrest mechanism 60 through the movable component 64, thereby solving the problem of poor user experience caused by too close distance between the push rod motor of the iron frame of the sofa and the seat frame surface in the prior art.

Specifically, the movable component 64 includes a push rod 640 and a middle mounting rod 641. The push rod 640 is connected to the driving end of the driving component 63, and an end of the push rod 640 away from the driving component 63 is telescopically arranged. The middle mounting rod 641 extends along a horizontal direction and is perpendicular to the push rod 640, the end of the push rod 640 away from the driving component 63 is hinged to the middle mounting rod 641, and one end of the middle mounting rod 641 is connected to the footrest mechanism 50. In this way, the linear movement of the driving component 63 can be converted into the telescopic movement of the push rod 640, and further converted into the angle and position changes of the footrest mechanism 50. When the seat bracket is switched among the sitting posture state, the TV posture state and the lying posture state, the movement of the footrest mechanism 50 is smooth and controllable, sudden change or lagging phenomena during the switching process are reduced, and the comfort experience of the user is improved. Moreover, when the driving component 63 drives the movable component 64 to drive the footrest mechanism 50 to extend or retract, the driving component 63 will never be too close to the seat frame surface, or even collide with the seat frame surface, so as to avoid the potential safety hazard that the user may touch the driving component 63 during use.

Optionally, in an embodiment of the driving mechanism 1-60, the shielding plate 622 may be connected to the middle mounting rod 641. Similarly, when the driving mechanism 1-60 drives the seat bracket to be switched from the sitting posture state to the leisure posture state, the shielding plate 622 is always located at the position of the highest point of the transmission component 62 and is in contact with the support surface on the seat frame mounting member 40, so as to provide additional support to the user.

According to another aspect of this disclosure, a seat bracket is provided. The seat bracket includes a mounting base 1-10 fixed relative to the ground, a seat frame mounting member 40, a suspension assembly 70, a footrest mechanism 50, a backrest mechanism 60 and the driving mechanism 1-60 mentioned above. The seat frame mounting member 40 is movably connected to the mounting base 1-10 through the suspension assembly 70. The footrest mechanism 50 and the backrest mechanism 60 are correspondingly arranged at two ends of the seat frame mounting member 40 respectively in an extensile or retractable manner to enable the position postures of the seat bracket to have a sitting posture state, a leisure posture state and a lying posture state, and the driving mechanism 1-60 drives the seat bracket to be switched among the sitting posture state, the leisure posture state and the lying posture state.

Optionally, when the seat bracket of this disclosure is in an iron frame floor-standing form, the seat frame mounting member 40 is directly supported on the ground through an iron frame mechanism with support feet. This design is suitable for different types of mounting bases 1-10, and a fixed armrest and an adjustable armrest both can be perfectly matched with the iron frame structure, thereby enhancing the universality of seat design and the flexibility of layout. Moreover, by adding multi-point support, the iron frame floor-standing form can more evenly distribute the weight of the sofa and the pressure applied by the user, thereby reducing the risk of local overload. Especially, when the sofa is in the lying posture state, the design of multi-point support can ensure the stability of the entire seat structure, thereby improving the reliability and safety during long-term use.

Optionally, when the seat bracket of this disclosure is in an armrest floor-standing form, the mounting base 1-10 is in directly contact with the ground to form stable support points. The stability of the entire sofa is increased, and it is also ensured that when the position posture changes, the armrest of the sofa will not generate unnecessary shaking or shifting. Especially, when the sofa is switched from the sitting posture to the lying posture, the user can comfortably lean on the armrest to enjoy more comfortable and safe experience. Moreover, the floor-standing design of the armrest usually can bring a more modern and streamlined appearance style, and a connecting structure and support legs exposed below a traditional sofa are hidden, so that the appearance of the sofa is more concise and fashionable.

As shown in FIG. 21 and FIG. 23, in this disclosure, the mounting base 1-10 includes an armrest main plate 1-11 and an armrest mounting plate 30 which are connected to each other, the seat bracket further includes a fixed frame 1-13, and the fixed frame 1-13 includes two rear driving tubes 91, wherein the two rear driving tubes 91 are both connected to the armrest main plate 1-11 or the armrest mounting plate 30; or one of the two rear driving tubes 91 is connected to the armrest main plate 1-11, and the other of the two rear driving tubes 91 is connected to the armrest mounting plate 30.

Optionally, in an embodiment of the driving mechanism 1-60, the driving body 61 is connected to the mounting base 1-10 through the fixed frame 1-13, and the driving body 61 is arranged on the two rear driving tubes 91. In this way, by connecting the driving body 61 to the mounting base 1-10 through two rear driving tubes 91, whether the two rear driving tubes 91 are both connected to the armrest main plate 1-11, or one of the two rear driving tubes 91 is connected to the armrest main plate 1-11 and the other is connected to the armrest mounting plate 30, the stability of the driving body 61 can be significantly enhanced, and the driving body 61 is not prone to shaking or displacement during operation, thereby improving the stability and reliability of the entire seat bracket during posture change. Moreover, selecting a suitable position to connect the rear driving tube 91 can optimize the spatial layout between the driving body 61 and other structural components (such as the transmission component 62 and the suspension assembly 70), thereby avoiding the possibility of interference with the seat frame surface and other movement components due to improper layout of the driving mechanism 1-60, and ensuring the smooth operation of the seat bracket in various postures.

Optionally, in another embodiment of the driving mechanism 1-60, the driving component 63 is arranged on one of the two rear driving tubes 91 close to the backrest mechanism 60. In this way, the driving component 63 is fixed through one rear driving tube 91 and then is fixed to the mounting base 1-10, whether the rear driving tube 91 is connected to the armrest main plate 1-11 or connected to the armrest mounting plate 30, the stability of the driving component 63 can be significantly enhanced, and the driving component is not prone to shaking or displacement during operation, thereby improving the stability and reliability of the entire seat bracket during posture change.

In this embodiment, the armrest main plate 1-11 is arranged in a floor-standing form and is configured to be connected to a sofa armrest; and the armrest mounting plate 30 is fixedly connected to the armrest main plate 1-11 to suspend the seat bracket. In other embodiments, the mounting base 1-10 may be constructed in various styles, or may be of a bracket structure with support feet, so that the suspended arrangement of the seat bracket can be achieved.

In this disclosure, the suspension assembly 70 includes a transition swing rod 72, the transition swing rod 72 is movably connected to the mounting base 1-10 through the auxiliary swing assembly 100 and the movable assembly 80, and the transition swing rod 72 is movably connected to the seat frame mounting member 40 through a connecting assembly 34, so that the seat frame mounting member 40 is movably arranged relative to the mounting base 1-10. In this way, the seat frame mounting member 40 can move in multiple dimensions relative to the mounting base 1-10. During the position posture switching process of the seat bracket, the seat frame mounting member 40 can flexibly adjust the position relative to the mounting base 1-10 according to the body posture and needs of the user, thereby providing more comfortable sitting and lying experience. By movably connecting the transition swing rod 72 to the seat frame mounting member 40 and the mounting base 1-10 respectively, the impact force generated during position posture change can be absorbed and dispersed, thereby improving the structural stability and smoothness of the entire seat bracket, making the overall structure of the seat bracket more compact, reducing the overall thickness, and facilitating use.

When the position posture of the seat bracket is the sitting posture state, the transition swing rod 72 is located at the position having the maximum overlapping degree with the mounting base 1-10. When the position posture of the seat bracket is the leisure posture state, the relative position between the transition swing rod 72 and the mounting base 1-10 is the same as the relative position when the position posture of the seat bracket is the sitting posture state, that is, the auxiliary swing assembly 100 and the movable assembly 80 drive the transition swing rod 72 to move to the position having the maximum overlapping degree with the mounting base 1-10. When the position posture of the seat bracket is the lying posture state, the auxiliary swing assembly 100 and the movable assembly 80 drive the transition swing rod 72 to move, so that the transition swing rod 72 extends out relative to the mounting base 1-10.

In an embodiment of the auxiliary swing assembly 100 of this disclosure, as shown in FIG. 19 and FIG. 22, the auxiliary swing assembly 100 includes a first swing connecting rod 104, a second swing connecting rod 105 and a front swing auxiliary rod 101. The first end of the first swing connecting rod 104 is hinged to the mounting base 1-10. The first end of the second swing connecting rod 105 is hinged to the transition swing rod 72, and the second end of the second swing connecting rod 105 is hinged to the second end of the first swing connecting rod 104. The first end of the front swing auxiliary rod 101 is hinged to the middle of the second swing connecting rod 105, and the second end of the front swing auxiliary rod 101 is hinged to the mounting base 1-10. By this arrangement, two of the three hinge locations of the auxiliary swing assembly 100 are respectively hinged to the mounting base 1-10, and the other is hinged to a movable rod, so that the movement of the movable rod is more dependent on the position change of the mounting base 1-10, resulting in a more fixed movement path of the movable rod. In addition, the mounting base 1-10 bears more structural support and stress dispersion, thereby improving the stability and reliability of the seat bracket.

In another embodiment of the auxiliary swing assembly 100 of this disclosure, as shown in FIG. 20 and FIG. 24, the auxiliary swing assembly 100 includes a first swing connecting rod 104, a second swing connecting rod 105 and a front swing auxiliary rod 101. The first end of the first swing connecting rod 104 is hinged to the transition swing rod 72. The first end of the second swing connecting rod 105 is hinged to the transition swing rod 72. The first end of the front swing auxiliary rod 101 is hinged to the second end of the first swing connecting rod 104, the second end of the second swing connecting rod 105 is hinged to the middle of the front swing auxiliary rod 101, and the second end of the front swing auxiliary rod 101 is hinged to the mounting base 1-10. By the above arrangement, when the seat bracket is in the sitting posture state, an included angle between the first front footrest connecting rod 55 at a retraction position and the mounting base 1-10 is an acute angle, and the thickness of a storage position may be smaller. The first front footrest connecting rod 55 rotates forward and stands up in an extending position (from the leisure posture state to the lying posture state), which not only drives the seat frame mounting member 40 to move forward, but also increases the distance between the seat frame mounting member 40 and the mounting base 1-10, thereby being advantageous for the front end of the seat frame mounting member 40 in an extended state to tilt upward, so as to enable the user to feel more comfortable in the lying posture state.

In still another embodiment of the auxiliary swing assembly 100 of this disclosure, as shown in FIG. 25, the auxiliary swing assembly 100 includes a first slide roller 320 and a first guide track 321. The first slide roller 320 is connected to the transition swing rod 72, and the first slide roller 320 is rotatably arranged around an axis of the first slide roller 320. The first guide track 321 is fixed on the mounting base 1-10, and the first slide roller 320 is movably arranged in the first guide track 321 along an extension direction of the first guide track 321. When the position posture of the seat bracket is the sitting posture state or the leisure posture state, the first slide roller 320 approaches the position of the mounting base 1-10 along the extension direction of the first guide track 321. When the position posture of the seat bracket is changed to the lying posture state, the first slide roller 320 moves to the position away from the mounting base 1-10 along the extension direction of the first guide track 321.

In this embodiment, one end of the first guide track 321 may be fixedly connected to the mounting base 1-10 through bolts and nuts. The entire auxiliary swing assembly 100 is a roller type slide rail with a simple structure.

Specifically, the joint between the first guide track 321 and the mounting base 1-10 is higher than the lowest point of the mounting base 1-10, so that when the first slide roller 320 moves along the first guide track 321, the transition swing rod 72 is higher than the mounting base 1-10. In this way, during the movement of the transition swing rod 72, the lowest point of the transition swing rod 72 is always higher than the lowest point of the mounting base 1-10. Due to the fixed arrangement of the mounting base 1-10 relative to a support base surface, the minimum distance between the lowest point of the suspension assembly 70 and the support base surface is always the distance between the lowest point of the mounting base 1-10 and the support base surface. Thus, when the seat bracket in this disclosure is used by a movable sofa, the bottom vertical space of the movable sofa is larger, which is more conducive to cleaning the bottom of the movable sofa; and during the movement of the transition swing rod 72, the height of the vertical space is not affected. It is ensured that when the transition swing rod 72 moves along the first guide track 321, the transition swing rod 72 does not come into contact or interfere with any part of the mounting base 1-10. Especially, when the position posture of the sofa is switched, the movement path of the transition swing rod 72 is lifted to avoid collision with other components, thereby ensuring the smooth and safe movement.

In an embodiment of the movable assembly 80 of this disclosure, the movable assembly 80 includes a second connecting rod 84, a first connecting rod 83 and a third connecting rod 85. The first end of the second connecting rod 84 is hinged to the mounting base 1-10. The first connecting rod 83 and the second connecting rod 84 are arranged at an interval, and the first end of the first connecting rod 83 is hinged to the mounting base 1-10. The first end of the third connecting rod 85 is hinged to the second end of the second connecting rod 84, the second end of the first connecting rod 83 is hinged to the middle of the third connecting rod 85, and the second end of the third connecting rod 85 is hinged to the transition swing rod 72.

In this embodiment, the third connecting rod 85 includes at least four bent rod segments which are connected in sequence. The length and angle of each bent rod segment can be adjusted to ensure that during position posture change (for example, from the sitting posture state to the lying posture state), in the process of driving the transition swing rod 72 to move, the backrest mechanism 60 is avoided so as to avoid the collision between the transition swing rod 72 and the backrest mechanism 60. Furthermore, a first limiting component 343 is optionally arranged on at least four bent rod segments of the third connecting rod 85, so as to more effectively limit the movement range of the first connecting rod 83, prevent excessive extension or retraction and prevent the entire mechanism from being damaged, thereby avoiding potential safety risks to users due to excessive movement. The first limiting component 343 is usually configured to prevent the further movement of the movable assembly 80 when reaching a specific position, thereby ensuring that the transition swing rod 72 can safely and stably stay at a correct position in any position posture state.

In order to ensure that the distance between the bottom of the suspension assembly 70 of the seat bracket and the ground is not changed during position posture change, the joint between the first end of the first connecting rod 83 and the mounting base 1-10 is higher than the lowest point of the mounting base 1-10, the length of the second connecting rod 84 is L1, the length of the first connecting rod 83 is L2, and the length of the third connecting rod 85 is L3, wherein L1>L2>½L3, so that during the movement of the third connecting rod 85, the transition swing rod 72 is higher than the mounting base 1-10. In this way, during the movement of the transition swing rod 72, the lowest point of the transition swing rod 72 is always higher than the lowest point of the mounting base 1-10. Due to the fixed arrangement of the mounting base 1-10 relative to the ground, the minimum distance between the lowest point of a suspension mechanism and a support base surface is always the distance between the lowest point of a mounting structure 1 and the support base surface. Thus, when the seat bracket in this disclosure is used by a movable sofa, the bottom vertical space of the movable sofa is larger, which is more conducive to cleaning the bottom of the movable sofa; and during the movement of the transition swing rod 72, the height of the vertical space is not affected.

In another embodiment of the movable assembly 80 of this disclosure, the movable assembly 80 includes a second connecting rod 84, a first connecting rod 83 and a third connecting rod 85. The first end of the second connecting rod 84 is hinged to the mounting base 1-10. The first end of the first connecting rod 83 is hinged to the middle of the second connecting rod 84, and the second end of the first connecting rod 83 is hinged to the transition swing rod 72. The first end of the third connecting rod 85 is hinged to the second end of the second connecting rod 84, and the second end of the third connecting rod 85 is hinged to the transition swing rod 72. By this arrangement, two of the three hinge locations of the movable assembly 80 are respectively hinged to the transition swing rod 72, and the other is hinged to the mounting base 1-10, so that the movement path of the transition swing rod 72 is more determined by the relative position between the transition swing rod 72 and the mounting base 1-10. During seat posture change, the transition swing rod 72 has a wider movement range and possibility, which can better adapt to the needs of different users. The movement path of the transition swing rod 72 is optimized, the structural stability and carrying capacity are enhanced, and the accuracy and reliability of the movement are also improved.

In still another embodiment of the movable assembly 80 of this disclosure, the movable assembly 80 includes a second slide roller and a second guide track. The second slide roller is connected to the transition swing rod 72, and the second slide roller is rotatably arranged around an axis of the second slide roller. One end of the second guide track is fixed to the mounting base 1-10, and the second slide roller is movably arranged in the second guide track along an extension direction of the second guide track. When the position posture of the seat bracket is the sitting posture state or the leisure posture state, the first slide roller 320 moves to the position close to the mounting base 1-10 along the extension direction of the first guide track 321. When the position posture of the seat bracket is changed to the lying posture state, the first slide roller 320 moves to the position away from the mounting base 1-10 along the extension direction of the first guide track 321.

In this embodiment, one end of the second guide track may be fixedly connected to the mounting base 1-10 through bolts and nuts. The entire movable assembly 80 is a roller type slide rail with a simple structure.

Specifically, the joint between the second guide track and the mounting base 1-10 is higher than the lowest point of the mounting base 1-10, so that when the second slide roller moves along the second guide track, the transition swing rod 72 is higher than the mounting base 1-10. In this way, during the movement of the transition swing rod 72, the lowest point of the transition swing rod 72 is always higher than the lowest point of the mounting base 1-10. Due to the fixed arrangement of the mounting base 1-10 relative to a support base surface, the minimum distance between the lowest point of the suspension assembly 70 and the support base surface is always the distance between the lowest point of the mounting base 1-10 and the support base surface. Thus, when the seat bracket in this disclosure is used by a movable sofa, the bottom vertical space of the movable sofa is larger, which is more conducive to cleaning the bottom of the movable sofa; and during the movement of the transition swing rod 72, the height of the vertical space is not affected. It is ensured that when the transition swing rod 72 moves along the second guide track, the transition swing rod 72 does not come into contact or interfere with any part of the mounting base 1-10. Especially, when the position posture of the sofa is switched, the movement path of the transition swing rod 72 is lifted to avoid collision with other components, thereby ensuring the smooth and safe movement.

Optionally, in this disclosure, the auxiliary swing assembly 100 may use any one of embodiments; and the movable assembly 80 may use any one of embodiments.

Specifically, the connecting assembly 34 includes a rear swing rod 73, a front swing rod 71 and a front driving rod 92. The first end of the rear swing rod 73 is hinged to the transition swing rod 72, and the second end of the rear swing rod 73 is hinged to the seat frame mounting member 40. The front swing rod 71 and the rear swing rod 73 are arranged at an interval, the first end of the front swing rod 71 is hinged to the transition swing rod 72, and the second end of the front swing rod 71 is hinged to the seat frame mounting member 40. In this way, the rear swing rod 73 and the front swing rod 71 are respectively hinged to the transition swing rod 72 and the seat frame mounting member 40 to form a closed connecting rod quadrilateral structure, which can finely control the movement path of the seat frame mounting member 40 relative to the transition swing rod 72 to ensure that during posture change, the seat frame mounting member 40 can move along a predetermined and smooth path without deviating from an expected trajectory.

Optionally, the connecting assembly 34 further includes a front driving rod 92, the first end of the front driving rod 92 is hinged to the middle of the rear swing rod 73, and the second end of the front driving rod 92 is hinged to the footrest mechanism 50. Specifically, the second end of the front driving rod 92 is hinged to the footrest driving plate 51 of the footrest mechanism 50. By the above arrangement, the front driving rod 92 is not only hinged to the middle of the rear swing rod 73 but also hinged to the seat frame mounting member 40 and the footrest mechanism 50, so that the force in the movement process is effectively dispersed, the stress concentration is avoided, and the durability of the assembly is improved. During the movement change of the footrest mechanism 50, the seat frame mounting member 40 may also be in responsive linkage to achieve more complex functional coordination, so as to ensure that during posture change of the seat, the actions between components are coordinated, thereby improving the user experience.

As shown in FIG. 18 and FIG. 21, the footrest mechanism 50 includes a first connecting rod group and a second connecting rod group, wherein the first connecting rod group includes a footrest driving plate 51, an outer footrest plate 53, a first front footrest connecting rod 55 and a second front footrest connecting rod 56 which are pivotally connected in sequence, and the second connecting rod group includes an inner footrest plate 52 and a rear footrest plate 54 which are pivotally connected; and the middle of the outer footrest plate 53 is hinged to the middle of the inner footrest plate 52, the middle of the first front footrest connecting rod 55 is hinged to the middle of the rear footrest plate 54, the footrest driving plate 51 and the inner footrest plate 52 are respectively hinged to the seat frame mounting member 40, the front driving rod 92 is hinged to the footrest driving plate 51 or the inner footrest plate 52, and the transmission component 62 or the movable component 64 is optionally connected to the front driving rod 92 or the footrest driving plate 51 or the outer footrest plate 53 or the first front footrest connecting rod 55 or the second front footrest connecting rod 56 or the inner footrest plate 52 or the rear footrest plate 54; and the footrest mechanism 50 further includes a first foot shelf 47 and a rear footrest 59, wherein an end of the rear footrest plate 54 away from the inner footrest plate 52 is hinged to the first end of the rear footrest 59; and the first foot shelf 47 includes a front footrest plate 57 and a front footrest 58 which are pivotally connected, the second end of the rear footrest 59 is hinged to the front footrest plate 57, an end of the second front footrest connecting rod 56 away from the first front footrest connecting rod 55 is hinged to the front footrest 58, and the third end of the rear footrest 59 is hinged to the middle of the second front footrest connecting rod 56, wherein an included angle is formed between the front footrest plate 57 and the front footrest 58.

By the above arrangement, a preset included angle is respectively formed between the footrest driving plate 51 and the outer footrest plate 53, between the outer footrest plate 53 and the first front footrest connecting rod 55, between the first front footrest connecting rod 55 and the second front footrest connecting rod 56, and between the inner footrest plate 52 and the rear footrest plate 54. The preset included angle L1 satisfies: 30°≤L1≤120°. In addition, the seat frame mounting member 40, the footrest driving plate 51, the outer footrest plate 53 and the inner footrest plate 52 form a planar quadrilateral structure; the outer footrest plate 53, the first front footrest connecting rod 55, the inner footrest plate 52 and the rear footrest plate 54 form a planar quadrilateral structure; the first front footrest connecting rod 55, the second front footrest connecting rod 56, the rear footrest plate 54 and the first foot shelf 47 form a planar quadrilateral structure; and the first foot shelf 47 and the rear footrest 59 are respectively configured to support the legs of the user. In this way, after the driving body 61 applies a driving force to any connecting rod of the footrest mechanism 50 by the transmission component 62, the connecting rods of the three planar quadrilateral structures are unfolded in sequence, and the footrest driving plate 51 and the outer footrest plate 53, the outer footrest plate 53 and the first front footrest connecting rod 55, the first front footrest connecting rod 55 and the second front footrest connecting rod 56, as well as the inner footrest plate 52 and the rear footrest plate 54 are infinitely close to parallel, so that the overall structure is stable. The first foot shelf 47 and the rear footrest 59 are driven to be unfolded while the three planar quadrilateral structures are unfolded in sequence. Furthermore, in a case that the forward extension distance is unchanged, the lengths of six connecting rods in this disclosure are all shortened, so that the shortened connecting rods occupy a less space in a vertical direction during storage, so as to achieve a thinner storage thickness of the footrest mechanism 50 in a sitting posture state.

In this embodiment, the footrest mechanism 50 further includes a second limiting component 49. The second limiting component 49 is optionally arranged on any one of the connecting rods of the first connecting rod group and the second connecting rod group, the first foot shelf 47, the rear footrest 59 and the seat frame mounting member 40, so that when the footrest mechanism 50 extends to a first preset position, the second limiting component 49 is in limiting cooperation with one of the footrest driving plate 51, the outer footrest plate 53, the first front footrest connecting rod 55, the second front footrest connecting rod 56, the inner footrest plate 52 and the rear footrest plate 54 close to the second limiting component 49. In this way, if the footrest mechanism 50 extends into an extreme state when the included angle between the footrest driving plate 51 and the outer footrest plate 53 is 120°, the included angle between the outer footrest plate 53 and the first front footrest connecting rod 55 is 120°, the included angle between the first front footrest connecting rod 55 and the second front footrest connecting rod 56 is 120°, as well as the included angle between the inner footrest plate 52 and the rear footrest plate 54 is 120°, the second limiting component 49 abuts against any one of the connecting rods to maintain the footrest mechanism 50 in an extremely extended state and also enhance the overall stability of the footrest mechanism 50.

As shown in FIG. 18 and FIG. 21, the backrest mechanism 60 includes a backrest mounting plate 10, a front backrest connecting rod 21, a rear backrest connecting rod 22 and a driving plate 23. The backrest mounting plate 10 is movably arranged. The first end of the front backrest connecting rod 21 is hinged to the backrest mounting plate 10. The first end of the rear backrest connecting rod 22 is hinged to the backrest mounting plate 10. A first hinge location 540, a second hinge location 541, a third hinge location 542 and a fourth hinge location 543 are respectively arranged on the driving plate 23 at intervals, the driving plate 23 is hinged to the seat frame mounting member 40 through the first hinge location 540, the driving plate 23 is hinged to the second end of the front backrest connecting rod 21 through the second hinge location 541, the driving plate 23 is hinged to the second end of the rear backrest connecting rod 22 through the third hinge location 542, the driving plate 23 is hinged to one end of the rear driving rod 93 through the fourth hinge location 543, and the other end of the rear driving rod 93 is hinged to the mounting base 1-10. Specifically, the other end of the rear driving rod 93 is hinged to the armrest mounting plate 30. The middle of the front backrest connecting rod 21 is hinged to the mounting base 1-10 through the limiting rod 24.

By this arrangement, after a driving force is applied to the driving plate 23 at the fourth hinge location 543, the driving plate 23 rotates around the first hinge location 540 to drive the front backrest connecting rod 21 to move forward, so as to drive the front end of the backrest mounting plate 10 to move forward, and the driving plate 23 drives the rear backrest connecting rod 22 to move downward while rotating around the first hinge location 540 to pull the rear end of the backrest mounting plate 10 to move downward, so as to achieve the backward tilting of the backrest mounting plate 10. In this way, depending on the complex hinge structure of multiple hinge locations, the stability of the overall mechanism is improved, and each hinge location bears a specific force transmission and movement control role; and by accurate design and adjustment, the stability and reliability of the backrest mechanism 60 in each position posture state are ensured.

Optionally, the front backrest connecting rod 21 and the rear backrest connecting rod 22 both include two bent rod segments, and the two bent rod segments form an L-shaped rod.

By configuring the front backrest connecting rod 21 as the L-shaped rod and enabling an inflection point of the L-shaped rod to protrude away from the backrest mounting plate 10, when the position posture of the seat bracket is the lying posture state, the end of the front backrest connecting rod 21 connected to the backrest mounting plate 10 protrudes towards the direction close to the footrest mechanism 50, which is conducive to reducing the gap between a cushion arranged on the backrest mechanism 60 and a cushion arranged on the seat frame mounting member 40, thereby reducing the pinch risk.

Specifically, as shown in FIG. 25, taking a plane of a support foundation as a reference plane, when the seat bracket is switched from the sitting posture state to the lying posture state, the hinge location between the backrest mounting plate 10 and the front backrest connecting rod 21 or the hinge location between the backrest mounting plate 10 and the rear backrest connecting rod 22 is moved by a preset distance K3 relative to the reference plane along a horizontal direction, wherein the preset distance K3 is 228 mm-346 mm. Preferably, the preset distance K3 is 258 mm-316 mm. In this embodiment, the support foundation is the ground. In this way, after the seat bracket is switched to the lying posture state, the backrest mechanism 60 moves forward a preset distance K3 relative to the ground to compensate for the backward tilting distance of the backrest mounting plate 10, so that in the lying posture state, the backrest mounting plate 10 will not interfere with the wall, thereby ensuring the stability of the overall structure of the seat bracket, and achieving the zero wall leaning function of the seat bracket. Furthermore, in the process of switching from the sitting posture state to the lying posture state, the horizontal movement distance of the backrest mounting plate 10 is limited within a certain range, which is conducive to reducing the space required by the sofa during posture change, makes the entire product more compact, and is suitable for use in an environment with limited space. In addition, the movement of the backrest mounting plate 10 is closely linked to the movement of the seat frame mounting member 40 and the transition swing rod 72 through the driving plate 23, so as to form a coordinated movement system. This linkage effect ensures that during position posture change of the sofa, all parts can move synchronously and harmoniously to avoid discoordination or conflicts inside the mechanism.

Specifically, as shown in FIG. 25 and FIG. 26, taking the seat frame mounting member 40 as a reference object, when the seat bracket is switched from the sitting posture state to the lying posture state, the hinge location between the backrest mounting plate 10 and the front backrest connecting rod 21 or the hinge location between the backrest mounting plate 10 and the rear backrest connecting rod 22 is moved by a preset distance K4 relative to the reference object, wherein the preset distance K4 is 60 mm-100 mm, wherein the preset distance K3 is positively correlated with the preset distance K4; and the reference object moves a preset distance K5 along a horizontal direction relative to the reference plane. In this way, after the backrest mounting plate 10 is hinged to the seat frame mounting member 40 through a plurality of connecting rods and switched to the lying posture state through the seat bracket, the central connecting line between the two hinge locations where two ends of the front backrest connecting rod 21 is respectively hinged to the backrest mounting plate 10 and the driving plate 23 is nearly horizontal, so as to enable the hinge location between the backrest mounting plate 10 and the front backrest connecting rod 21 or the hinge location between the backrest mounting plate 10 and the rear backrest connecting rod 22 to move forward to the maximum extent, thereby further driving the backrest mounting plate 10 to move forward, so as to achieve a zero wall leaning effect. Moreover, under the zero wall leaning, the forward movement distance (preset distance K4) of the backrest mounting plate 10 is greater. In this case, the requirement for the forward movement distance (preset distance K5) of the seat frame mounting member 40 is smaller, so as to make the center of gravity of the seat bracket more stable, thereby reducing the occurrence of unstable center of gravity caused by excessive forward movement of the seat frame mounting member 40. Moreover, the preset distance K5 for the movement of the seat frame mounting member 40 can provide a sufficient space for the horizontal movement and lying of the backrest mounting plate 10, so that under the zero wall leaning, the backrest mounting plate 10 can accurately move to the ideal position required for the lying posture state in a larger space.

In this disclosure, when the seat bracket is in the sitting posture state, along a vertical direction, the overall thickness between the mounting base 1-10 and the top of the seat frame mounting member 40 is 150 mm-160 mm. In this way, in a case that the height of the seat frame mounting member 40 is unchanged, the overall structure is thinned, which is conducive to increasing the vertical space below the mounting base 1-10, thereby saving the use of the space while preventing the use functions of the sofa from being affected. Moreover, a thinner overall thickness is also beneficial for transportation and mounting processes of the sofa. During transportation, a thinner sofa can more easily pass through narrow passages such as stairs and door frames, thereby reducing the difficulty of transport and the risk of damage. During mounting, the compact size simplifies the mounting step and reduces the requirement for the mounting space.

In this disclosure, when the seat bracket is in the sitting posture state, the thickness of the footrest mechanism 50 is 120 mm-130 mm. In this way, the footrest mechanism 50 occupies a less space during storage, and the change in thickness when the footrest mechanism 50 is unfolded is conducive to providing a sufficient leg support space, thereby ensuring that even in the sitting posture state, the footrest mechanism 50 can provide users with sufficient support and comfort. Moreover, this thickness range can improve the space utilization efficiency without affecting the comfort.

In this disclosure, when the seat bracket is switched from the sitting posture state to the lying posture state, the angle change range of rotation of the backrest mechanism 60 is 33°-43°. In this way, it is ensured that when the user changes to the lying posture state, the backrest mechanism 60 can provide a suitable support angle, so that the back of the user rests comfortably. A tilt angle of 33°-43° is conducive to optimizing the space utilization during posture change, so that when the user lies down, the comfort of the lying posture can be ensured, and excessive tilting of the backrest mechanism 60 can be prevented to maintain the structural stability of the seat bracket, thereby ensuring that the sofa can adapt to a compact layout in different postures, while also helping to avoid movement interference between the backrest mechanism 60 and other parts of the sofa during posture change, so as to improve the user experience.

In this disclosure, when the seat bracket is switched from the sitting posture state to the lying posture state, the angle change range of lifting of the seat frame mounting member 40 is 4.5°-6.5°. In this way, it can be ensured that when the user changes to the lying posture state, the seat frame mounting member 40 can be slightly lifted to coordinate with the movement of the backrest mechanism 60 and the footrest mechanism 50, thereby providing an ergonomic lying posture angle. This angle range can well support the spine of the user to reduce the pressure on the body during posture change, thereby providing more comfortable lying experience. Moreover, the limitation on the lifting angle of the seat frame structure aims to balance space efficiency and lying comfort. A too large lifting angle may occupy much space, while a too small lifting angle may affect the lying comfort. This angle range not only avoids the occupation of too much extra space, but also ensures that the legs and back of the user receive appropriate support when the user lies down, so that the sofa can still maintain space friendliness during posture change.

In order to ensure that the distance between the lowest point of the seat bracket and the support foundation is unchanged when the position posture of the seat bracket is switched, the value range of a distance S between the lowest point of the mounting base 1-10 and the support foundation is: 11 cm≤S≤17 cm. The seat frame mounting member 40, the footrest mechanism 50, the backrest mechanism 60 and the driving mechanism 1-60 are respectively arranged above the mounting base 1-10. When the position posture of the seat bracket is switched among the sitting posture state, the leisure posture state and the lying posture state, the distance between the lowest point of the seat bracket and the support foundation is always not less than the distance S. Thus, when the seat bracket in the embodiment of this disclosure is used by a movable sofa, the bottom vertical space of the movable sofa is larger, which is more conducive to cleaning the bottom of the movable sofa; and during position posture switching of the seat bracket, the height of the vertical space is not affected.

Preferably, the Value Range of the Distance S Is: 12 cm≤s≤14 cm.

According to still another aspect of the technical solution of this disclosure, a movable sofa is provided. The movable sofa includes the seat bracket mentioned above.

By using the seat bracket of this disclosure, the movable sofa can be smoothly switched among the sitting posture state, the leisure posture state and the lying posture state, and the most suitable seat angle and support can be provided according to different use scenarios and user needs. By replacing the traditional push rod motor with a slider motor, the problem of poor user experience caused by too close distance between the push rod motor of the iron frame of the sofa and the seat frame surface in the prior art is essentially solved.

From the above description, it can be seen that the above embodiments of this disclosure achieve the following technical effects:

The driving mechanism is used for a seat bracket. The seat bracket includes a mounting base 1-10 and a seat frame mounting member 40 movably connected to the mounting base 1-10. Two ends of the seat frame mounting member 40 are respectively provided with a footrest mechanism 50 and a backrest mechanism 60 in an extensile or retractable manner, so that position postures of the seat bracket include a sitting posture state, a leisure posture state and a lying posture state. The driving mechanism 1-60 includes a driving body 61 and a transmission component 62. The driving body 61 is connected to the mounting base 1-10 and located at an end close to the backrest mechanism 60, and at least part of the driving body 61 is movably arranged along a horizontal direction. The transmission component 62 is connected to at least part of the driving body 61 and the footrest mechanism 50 respectively to drive the transmission component 62 to move through at least part of the driving body 61, so as to switch the seat bracket among the sitting posture state, the leisure posture state and the lying posture state, wherein the position of the lowest point of the transmission component 62 is higher than the position of the lowest point of the driving body 61. By using the technical solution of this disclosure, the driving body 61 moves along a horizontal direction, so that the transmission component 62 transmits the driving force from the driving body 61 to drive the footrest mechanism 50 to perform an extension or retraction movement. Compared with a traditional arrangement manner of a push rod motor, it is not simple linear push-pull. In this disclosure, the driving body 61 always moves along the horizontal direction, and the position of the lowest point of the transmission component 62 is always higher than the position of the lowest point of the driving body 61, so that when the position posture of the seat bracket changes, the transmission component 62 indirectly drives the footrest mechanism 50 to move, and the driving body 61 or an extended part thereof will never be too close to the seat frame surface, or even collide with the seat frame surface, so as to avoid the potential safety hazard that the user may touch the driving body 61 during use, thereby solving the problem of poor user experience caused by too close distance between the push rod motor of the iron frame of the sofa and the seat frame surface in the prior art.

Some embodiments of this disclosure provides a sofa. The sofa includes the seat bracket provided above. An external acting force can be applied to the limiting end of the driving member, so that the driving member can rotate relative to the seat frame mounting member 40. The front backrest connecting rod 21 and the rear backrest connecting rod 22 are hinged to the seat frame mounting member 40 through the driving member, so that the driving member can drive the front backrest connecting rod 21 and the rear backrest connecting rod 22 to move, the front end of the front backrest connecting rod 21 can drive the front end of the backrest mounting plate 10 to move, and the upper end of the rear backrest connecting rod 22 can drive the rear end of the backrest mounting plate 10 to move. Therefore, the backrest mounting plate 10 can move relative to the seat frame mounting member 40, and the relative position between the backrest mounting plate 10 and the seat frame mounting member 40 is more flexible. When the backrest mounting plate 10 is switched from the folding position to the unfolding position, the backrest mounting plate 10 can move forward a greater distance relative to the seat frame mounting member 40, so as to solve the problem of interference between a backrest and a wall, thereby achieving the zero wall leaning function of the sofa. Moreover, because the front backrest connecting rod 21 and the rear backrest connecting rod 22 are both hinged to the driving member, during the movement of the backrest mounting plate 10, the linkage performance between connecting rods is enhanced, so as to enhance the carrying capacity, stability and movement smoothness of the sofa.

In addition, it should be noted that using terms such as “first” and “second” to define parts is only intended to facilitate the differentiation of corresponding parts. Unless otherwise stated, the above terms have no special meanings and therefore cannot be understood as limiting the scope of protection of this disclosure.

The above descriptions are merely preferred embodiments of this disclosure, but are not intended to limit this disclosure. For those skilled in the art, this disclosure may have various modifications and variations. Any modifications, equivalent substitutions, improvements, and the like made within the spirit and principle of this disclosure shall fall within the scope of protection of this disclosure.