FOLDING CHAIR

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application 202423239053.7, filed on Dec. 26, 2024, which is incorporated herein by reference.

TECHNICAL FIELD

The present invention discloses a folding chair, and particularly relates to a chair with a foldable backrest.

BACKGROUND

Most folding chairs are configured as a structure including a foldable chair body and chair back, the chair back being designed as an X-cross structure. For example, Chinese document No. CN 215737889 U disclosed a folding fishing chair frame, where two rear fork tubes are arranged crosswise, and a long locking key and a short locking key are disposed between the two rear fork tubes to prevent the chair frame from folding under accidental external force.

SUMMARY

In view of deficiencies in the prior art, the present invention provides a folding chair, where back support members are arranged horizontally during unfolding through a chair back support folding design, having advantages such as a reasonable structure, and safety and stability.

To achieve the above objective, the present invention is implemented through the following technical solution:

The folding chair includes a chair back, where the chair back includes two back tubes arranged in parallel, a chair back folding assembly is disposed between the two back tubes, the chair back folding assembly includes an intermediate connector and back support tubes on two sides of the intermediate connector, one end of each back support tube is hinged to the intermediate connector, the other end of each back support tube is hinged to a back connector, the back connector is fixedly connected to the corresponding back tube, a stopper is provided on the back connector, and the stopper of the back connector is capable of limiting a rotation angle of the back support tube when the chair back is unfolded.

Further, two or more chair back folding assemblies are provided along an extension direction of the back tubes.

Further, the chair back folding assembly includes a first folding assembly and a second folding assembly, a connecting bar is disposed between the first folding assembly and the second folding assembly, the first folding assembly includes two back support tubes disposed up and down and aligned horizontally, the second folding assembly includes one back support tube disposed horizontally, and the back support tubes and the intermediate connector form a back support structure in a shape of a Chinese character “”.

Further, the chair back folding assembly includes a first folding assembly and a second folding assembly, the first folding assembly includes two back support tubes disposed up and down and aligned horizontally, the second folding assembly includes two back support tubes disposed up and down and aligned horizontally, and the back support tubes and the intermediate connector form a double-lock back support structure.

Further, the first folding assembly includes the intermediate connector, a first hinge position is provided on one side of the intermediate connector for connecting a first back support tube, a second hinge position is provided on one side of the intermediate connector for connecting a second back support tube, and a distance from the first hinge position on one side of the intermediate connector to a centerline of the intermediate connector is greater than a distance from the second hinge position on the same side of the intermediate connector to the centerline of the intermediate connector.

Further, the stopper is provided on the intermediate connector to limit a rotation angle of a first back support tube during unfolding, and an intermediate portion of the intermediate connector is a through-hole structure.

Further, the back connector includes a main body, a first mounting groove is provided on one side of the main body for engaging with the corresponding back tube, a second mounting groove is provided on another side of the main body for engaging with the corresponding back support tube, the back support tube is mounted in the second mounting groove by riveting, the second mounting groove has a side wall opening, the stopper is formed on an open side, an end portion of the back support tube comes into contact with the stopper and stops rotating when the chair back is unfolded and the back support tube rotates, and the back support tube rotates around a riveting shaft into the side wall opening of the second mounting groove and causes the two back tubes to approach the middle when the chair back is folded.

Further, bottom ends of the two back tubes of the chair back are both hinged to a chair seat, the chair seat includes two front leg tubes, two rear leg tubes, two seat tubes, two front leg support tubes, and a front cross tube, the two front leg tubes are parallel, the front leg tubes and the rear leg tubes are riveted by a front-rear leg connector to form a herringbone support, a top end of each rear leg tube is connected to an armrest, a rear end of the armrest is hinged to the corresponding back tube, the front leg support tube is connected to the corresponding seat tube by a sitting connector, and the front cross tube is disposed between the two front leg support tubes.

Further, the front leg support tube engages with a front leg support liner tube, one end of the front leg support liner tube is riveted to the sitting connector, the other end of the front leg support liner tube is disposed in the front leg support tube to form a telescopic structure, a button is provided on one side of the sitting connector, the button is connected to a positioning pin, the front leg support tube and the front leg support liner tube are cooperatively provided with a positioning hole, the front leg support liner tube retracts into the front leg support tube and is positioned by the positioning pin when a chair frame is unfolded, the positioning pin disengages from the corresponding hole when the chair frame is folded, and the front leg support liner tube is stretched from the front leg support tube to form an extension sleeving tube.

Further, the seat tube and the back tube are vertically riveted by a rear leg sliding sleeve, and the rear leg sliding sleeve has a sleeve hole for a rear leg tube to pass through.

The folding chair of the present invention is safe and reliable, as the chair back folding assembly is positioned at a preset position via the stopper of the back connector on a side of the chair back when the chair frame is unfolded. The chair back folding assembly between the two back tubes has two structural modes, where one can adopt a back support structure in a shape of a Chinese character “”, and the other can adopt a double-lock back support structure, having advantages such as a reasonable structure and convenient use.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram of an unfolded state according to an embodiment of the present invention.

FIG. 2 is a diagram of a folded state according to an embodiment of the present invention.

FIG. 3 is a diagram of another folded state according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a back connector according to the present invention.

FIG. 5 is a schematic diagram of the back connector according to the present invention.

FIG. 6 is a schematic diagram of the back connector according to another embodiment of the present invention.

FIG. 7 is a diagram of an unfolded state according to another embodiment of the present invention.

FIG. 8 is a schematic diagram of engagement of a stopper of an intermediate connector according to the present invention.

FIG. 9 is a schematic diagram of an unlocked connection state of a seat tube, a sitting connector, and a front leg support tube according to the present invention.

FIG. 10 is a schematic diagram of a locked connection state of the sitting connector and the front leg support tube according to the present invention.

FIG. 11 is a schematic diagram of engagement of the front leg support tube with a button and a positioning pin according to the present invention.

DESCRIPTION OF EMBODIMENTS

The present invention is further described below with reference to the accompanying drawings:

Embodiments: Referring to FIGS. 1 to 6, a folding chair includes a chair back, the chair back includes two back tubes 1 arranged in parallel, and a chair back folding assembly 2 is disposed between the two back tubes 1. The chair back folding assembly 2 includes an intermediate connector 3 and back support tubes 4 on two sides of the intermediate connector, one end of each back support tube 4 is hinged to the intermediate connector 3, and the other end of each back support tube 4 is hinged to a back connector 5. The back connector 5 is fixedly connected to the back tube 1, a stopper 55 is provided on the back connector 5, and the stopper of the back connector 5 is capable of limiting a rotation angle of the back support tube 4 when the chair back is unfolded.

In the embodiments of the present invention, various tubes of the chair frame are not limited to hollow tubes, and solid or rod-like structures can also be used. Two or more chair back folding assemblies 2 are provided along an extension direction of the back tubes, thereby forming a more stable support.

In an embodiment of the present invention, as shown in FIG. 1 and FIG. 2, the chair back folding assembly 2 includes a first folding assembly 21 and a second folding assembly 22, and a connecting bar or a connecting tube is disposed between the first folding assembly and the second folding assembly. The first folding assembly includes two back support tubes 4 disposed up and down and aligned horizontally, the second folding assembly 22 includes one back support tube 4 disposed horizontally, and the back support tubes and the intermediate connector form a back support structure in a shape of a Chinese character “”. The first folding assembly 21 includes the intermediate connector 3, a first hinge position 31 is provided on one side of the intermediate connector 3 for connecting a first back support tube, and a second hinge position 32 is provided on one side of the intermediate connector 3 for connecting a second back support tube. A distance from the first hinge position 31 on one side of the intermediate connector 3 to a centerline of the intermediate connector is greater than a distance from the second hinge position 32 on the same side of the intermediate connector 3 to the centerline of the intermediate connector.

As shown in FIG. 1, FIG. 2, and FIG. 8, in an embodiment of the present invention, the stopper 301 is provided on the intermediate connector 3 to limit a rotation angle of the first back support tube during unfolding, the intermediate connector 3 has a structure that is larger at the top and smaller at the bottom, and an intermediate portion of the intermediate connector 3 is a through-hole structure. As shown in FIG. 4 and FIG. 5, the back connector 5 includes a main body 51, a first mounting groove 52 is provided on one side of the main body for engaging with the back tube, and a bottom of the first mounting groove 52 has a mounting hole 56 for engaging with one of the back support tubes. A second mounting groove 53 is provided on another side of the main body 51 for engaging with another back support tube, and the back support tube 4 is mounted in the second mounting groove 53 by riveting. The second mounting groove 53 has a side wall opening 54, and the stopper 55 is formed on an open side. An end portion of the back support tube comes into contact with the stopper 55 and stops rotating when the chair back is unfolded and the back support tube 4 rotates; when the chair back is folded, the back support tube rotates around a riveting shaft into the side wall opening 54 of the second mounting groove and causes the two back tubes 1 to approach the middle. An extension direction L1 of the second mounting groove is perpendicular to an extension direction L2 of the first mounting groove. The back connector 6 in FIG. 6 engages with the second folding assembly 22 in FIG. 1, a first mounting groove 61 of the back connector structure engages with the back tube, a second mounting groove 62 engages with the back support tube, the second mounting groove has a side wall opening, and the stopper 63 is formed on an open side.

Referring to FIG. 1 and FIG. 2, bottom ends of the two back tubes 1 of the chair back are both hinged to a chair seat, and the chair seat includes two front leg tubes 7, two rear leg tubes 8, two seat tubes 9, two front leg support tubes 10, and a front cross tube. The two front leg tubes 7 are parallel, and the front leg tubes 7 and the rear leg tubes 8 are riveted by a front-rear leg connector 11 to form a herringbone support. A top end of each rear leg tube 8 is connected to an armrest 12, and a rear end of the armrest 12 is hinged to the back tube 1. The front leg support tube 10 is connected to the seat tube 9 by a sitting connector 13, and the front cross tube is disposed between the two front leg support tubes 10. As shown in FIG. 2, FIG. 9, FIG. 10, and FIG. 11, the front leg support tube 10 engages with a front leg support liner tube 14, one end of the front leg support liner tube 14 is riveted to the sitting connector 13, and the other end of the front leg support liner tube 14 is disposed in the front leg support tube 10 to form a telescopic structure. A button 16 is provided on one side of the sitting connector 13, the button 16 is connected to a positioning pin 17, and the positioning pin 17 is located in a cavity formed by the sitting connector 13. The front leg support tube 10 and the front leg support liner tube 14 are cooperatively provided with a positioning hole. When a chair frame is unfolded, the front leg support liner tube 14 retracts into the front leg support tube 10 and is positioned by the positioning pin; when the chair frame is folded, the positioning pin disengages from the corresponding hole, and the front leg support liner tube 14 is stretched from the front leg support tube 10 to form an extension sleeving tube, as shown in FIG. 1, FIG. 2, and FIG. 3. The seat tube 9 and the back tube 1 are vertically riveted by a rear leg sliding sleeve 15, and in an unfolded state, the rear leg sliding sleeve 15 has a sleeve hole for the rear leg tube 8 to pass through. An upper end of the rear leg tube is riveted to a gear adjustment member, a plurality of gears are provided in the armrest 12, and the gear adjustment member engages with different gears to adjust different reclining angles of the chair back.

Referring to FIG. 7, the chair back folding assembly 2 of the present invention includes a first folding assembly 21 and a second folding assembly 22. The first folding assembly 21 includes two back support tubes disposed up and down and aligned horizontally, and its structure is the same as the first folding assembly in the embodiment of FIG. 1, including the intermediate connector 3, the back support tubes 4 on two sides, and the back connector 5. The second folding assembly has the same structure as the first folding assembly, the second folding assembly includes two back support tubes disposed up and down and aligned horizontally, and the back support tubes and the intermediate connector form a double-lock back support structure. Other structures of the folding chair in this embodiment are the same as those in the embodiment of FIG. 1, and will not be repeated here.

The folding chair of the present invention, as shown in FIGS. 1 to 6, includes two rear leg tubes 8, two front leg tubes 7, two front leg support tubes 10, two front leg support liner tubes 14, two front short cross tubes, one front cross tube, one cross center connector, two seat tubes 9, two back tubes 1, two sitting connectors 13, two armrests 12, two front-rear leg connectors 11, two rear leg sliding sleeves 15, and six back support tubes 4. The two front leg tubes 7 are parallel, bottom ends of the two front leg tubes 7 are riveted to the two front leg support tubes 10, and the two front leg support tubes 10 are parallel. Front ends of two front foot pads are riveted to one front short cross tube and the front cross tube. Two front segment cross tubes and the front cross tube are riveted in an X shape through a cross connector. The front short cross tube, the front cross tube, the front leg support tube, and the front leg tube are respectively riveted to tube plugs. An outer side of a telescopic sleeve in the tube is connected to the front leg support tube and disposed at a tube mouth of the front leg support tube, and the two front leg support tubes are parallel. One end of the front leg support liner tube 14 is riveted to the sitting connector 13, a front end of the sitting connector 13 is riveted to the front cross tube and another front short cross tube, the side end of the sitting connector engages with a button, and the upper end of the sitting connector is riveted to the seat tube 9. The seat tube and the back tube are vertically riveted by the rear leg sliding sleeve, and the front leg tube 7 and the rear leg tube 8 are riveted by the front-rear leg connector. An upper end of the rear leg tube 8 is riveted to the plastic adjustment plastic member, the rear leg tube 8 engages with the armrest through the plastic gear adjustment member, and the lower end of the rear leg tube 8 is riveted to a rear foot pad. One end of the lowermost two back support tubes is riveted to the back tube via the back connector 6, and the other end is riveted to a back bottom connector (that is, the intermediate connector on the lower side in FIG. 1). An upper end of the back bottom connector is hinged to a back lock connector (that is, the intermediate connector on the upper side in FIG. 1) via a connecting bar or a connecting tube, the back lock connector is riveted to four back support tubes, and the other ends of the four back support tubes are connected to the back tube through the back connector 5.

When the chair frame of the present invention is folded, a button is pressed and the seat tube 9 and the armrest 12 are lifted upward. The seat tube 9 pulls the front leg support liner tube 14 to extend, the intermediate connector 3 moves upward, the back support tubes 4 on two sides rotate, and the outer ends of the back support tubes 4 pull the two back tubes 1 toward the center. At the same time, retraction of the front cross tube drives the front leg support tube 10 to fold, a final folded state being as shown in FIG. 2 and FIG. 3.

The above descriptions are merely embodiments with the use of the technical content of this creation, and any modifications or changes made by those familiar with the art using this creation fall within the patent scope claimed by this creation and are not limited to those disclosed in the embodiments.