ELECTRIC SEAT RACK

Description

CROSS REFERENCE TO THE RELATED APPLICATIONS

This application is based upon and claims priority to Chinese Patent Application No. 202421748794.5, filed on Jul. 23, 2024, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present application relates to an electric seat rack and is mainly applicable to the design and production of a posture-adjustable electric sofa rack.

BACKGROUND

Referring to the patent publication CN110693227A of an invention, entitled “Electric Mechanical Extending Device”, the prior art has a defect for lack of a seat frame, and this defect brings inconvenience for installation and causes an increase in the production, installation and adjustment steps and costs on the one hand. On the other hand, if the processing accuracy is not high enough, the symmetry of left and right mechanisms may be affected, thereby affecting the overall stability of a motion mechanism.

SUMMARY

The technical problem solved by the present application is to overcome the above deficiencies in the prior art and to provide an electric seat rack with a seat frame support assembly, which is easy to produce and install at a low cost and has good overall stability.

The technical solution adopted by the present application to solve the above technical problems is: an electric seat rack, including a driving assembly, a seat frame support assembly, a backrest assembly and two mechanical extension units symmetrically arranged on the left and right, the backrest assembly being hinged to the seat frame support assembly, each mechanical extension unit including a leg-foot assembly and a transmission rod, characterized in that, the two leg-foot assemblies are respectively installed on two sides of the seat frame support assembly and are respectively hinged to one ends of the corresponding transmission rods, and the other ends of the transmission rods are hinged to the backrest assembly by backrest transmission rod hinge shafts; two ends of a driving rod of the driving assembly are respectively connected to the two leg-foot assemblies; the seat frame support assembly includes two quadrilateral support frames symmetrically arranged on two sides and a connecting assembly for fixing the two quadrilateral support frames into one. Based on the above design, the present application provides an integrated structure of a seat frame support assembly arranged in bilateral symmetry. The two mechanical extension units are directly installed on the seat frame support assembly. The production, installation and maintenance are relatively convenient and accurate, saving costs. The mechanical extension units on the left and right sides have high symmetry, thus achieving good overall stability.

A connecting assembly of the seat frame support assembly described herein includes a front upper connecting component, a front lower connecting component, a rear upper connecting component, and a rear middle connecting component, and the front upper connecting component, the front lower connecting component, the rear upper connecting component, and the rear middle connecting component are all fixedly connected to the two quadrilateral support frames and are configured to fix front upper parts, front lower parts, rear upper parts, and rear middle parts of the two quadrilateral support frames respectively.

The driving assembly described herein further includes a driving device, a front end of the driving device is hinged to the driving rod, and a rear end of the driving device is hinged to the rear middle connecting component. The driving device adopts an electric push rod, and the backrest frame has a tilt angle steplessly adjustable between 75° and 25°.

The backrest assembly described herein includes a backrest frame and backrest connecting components; the backrest frame is connected to upper ends of the backrest connecting components by bolts, and lower ends of the backrest connecting components are fixed to the backrest frame by the backrest transmission rod hinge shafts; the other ends of the backrest connecting components are hinged to the seat frame support assembly by backrest-seat frame hinge shafts. In this way, disassembly and installation are very simple. The backrest frame and the backrest connecting components do not need to be installed on the seat frame support assembly first and can be packaged and transported separately. After being delivered, the backrest frame and the backrest connecting components can be installed on the apparatus of the present application. Transportation space and cost can be saved on the one hand, and the risk of damage can be reduced on the other hand.

The leg-foot assembly described herein comprises a first leg link, a second leg link, a third leg link, a fourth leg link, a fifth leg link, a sixth leg link, and a footrest connecting component; one ends of the first leg link and the second leg link are hinged to the seat frame support assembly, a middle part of the first leg link is fixedly connected to the driving rod, the first leg link is hinged to one end of the transmission rod through a first leg link transmission rod hinge shaft, the other end of the first leg link is hinged to one end of the third leg link, a middle part of the third leg link is hinged to a middle part of the second leg link, the other end of the third leg link is hinged to one end of the fifth leg link, a middle part of the fifth leg link is hinged to a middle part of the fourth leg link, the other end of the fifth leg link is hinged to one end of a sixth leg link, the other end of the sixth leg link is hinged to one end of the footrest connecting component, the other end of the footrest connecting component is hinged to one end of the fourth leg link, and the other end of the fourth leg link is hinged to the other end of the second leg link.

Compared with the prior art, the present application has the following advantages and effects: With a seat frame support assembly, the electric seat rack is easy to produce and install at a low cost and has good overall stability.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a three-dimensional schematic diagram of an electric seat rack in an embodiment of the present application in a sitting-posture state.

FIG. 2 is a side view of the electric seat rack in an embodiment of the present application in a sitting-posture state.

FIG. 3 is a three-dimensional schematic diagram of the electric seat rack in an embodiment of the present application in a lying-posture state.

FIG. 4 is a side view of the electric seat rack in an embodiment of the present application in a lying-posture state.

In the figures,

• • 1—driving assembly; 11—driving rod; 12—driving device; 2—leg-foot assembly; 21—first leg link; 211—first leg link transmission rod hinge shaft; 22—second leg link; 23—third leg link; 24—fourth leg link; 25—fifth leg link; 26—sixth leg link; 27—footrest connecting component; 3—seat frame support assembly; 31—quadrilateral support frames on two sides; 32—connecting assembly for fixing the two quadrilateral support frames into one; 321—front upper connecting component; 322—front lower connecting component; 323—rear upper connecting component; 324—rear middle connecting component; 4—backrest assembly; 41—backrest frame; 42—backrest connecting component; 43—backrest-seat frame hinge shaft; 44—backrest transmission rod hinge shaft; 45—bolt; 5—transmission rod; α—tilt angle of backrest frame.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present application is further described in detail below in conjunction with the accompanying drawings and by embodiments. The following embodiments are explanations of the present application and the present application is not limited to the following embodiments. In FIG. 2 of the present application, the upper right corner is designated front, and the lower left corner is designated rear.

As shown in FIGS. 1-4, the electric seat rack in an embodiment of the present application includes a driving assembly 1, a seat frame support assembly 3, a backrest assembly 4 and two mechanical extension units symmetrically arranged on the left and right. The backrest assembly 4 is installed on the seat frame support assembly 3 by means of a backrest-seat frame hinge shaft 43. Each mechanical extension unit includes a leg-foot assembly 2 and a transmission rod 5. The design of the present application is characterized in that, the two leg-foot assemblies 2 are respectively installed on two sides of the seat frame support assembly 3 and are respectively hinged to one ends of the corresponding transmission rods 5, and the other ends of the transmission rods 5 are hinged to the backrest assembly 4 by backrest transmission rod hinge shafts 44; two ends of a driving rod 11 of the driving assembly 1 are respectively connected to the two leg-foot assemblies 2; the seat frame support assembly 3 includes two quadrilateral support frames 31 symmetrically arranged on two sides and a connecting assembly 32 for fixing the two quadrilateral support frames 31 into one. Based on the above design, the present application provides an integrated structure of a seat frame support assembly arranged in bilateral symmetry. The two mechanical extension units are directly installed on the seat frame support assembly 3. The production, installation and maintenance are relatively convenient and accurate, saving costs. The mechanical extension units on the left and right sides have high symmetry, thus achieving good overall stability.

A connecting assembly 32 of the seat frame support assembly 3 described herein includes a front upper connecting component 321, a front lower connecting component 322, a rear upper connecting component 323 and a rear middle connecting component 324, which are configured to fix front upper parts, front lower parts, rear upper parts, and rear middle parts of the two quadrilateral support frames 31 respectively.

The driving assembly 1 described herein further includes a driving device 12, a front end of the driving device 12 is hinged to the driving rod 11, and a rear end of the driving device 12 is hinged to the rear middle connecting component 324. Since the installation position of the rear middle connecting component 324 can be adjusted up and down according to actual needs, the driving force of the driving device 12 (a special case of an electric push rod) is roughly horizontal, thereby improving the working efficiency of the driving device 12.

The backrest assembly 4 described herein includes a backrest frame 41 and backrest connecting components 42; the backrest frame 41 is connected to upper ends of the backrest connecting components 42 by bolts 45, and lower ends of the backrest connecting components 42 are fixed to the backrest frame 41 by the backrest transmission rod hinge shafts 44; the other ends of the backrest connecting components 42 are hinged to the seat frame support assembly 3 by backrest-seat frame hinge shafts 43. In this way, disassembly and installation are very simple. The backrest frame 41 and the backrest connecting components 42 can be packaged and transported separately. After being delivered, the backrest frame 41 and the backrest connecting components 42 can be installed on the apparatus of the present application. Transportation space and cost can be saved on the one hand, and the risk of damage can be reduced on the other hand.

The leg-foot assembly 2 described herein comprises a first leg link 21, a second leg link 22, a third leg link 23, a fourth leg link 24, a fifth leg link 25, a sixth leg link 26, and a footrest connecting component 27; one ends of the first leg link 21 and the second leg link 22 are hinged to the seat frame support assembly 3, a middle part of the first leg link 21 is fixedly connected to the driving rod 11, an upper middle part of the first leg link is hinged to one end of the transmission rod 5 through a first leg link transmission rod hinge shaft 211, the other end of the first leg link 21 is hinged to one end of the third leg link 23, a middle part of the third leg link 23 is hinged to a middle part of the second leg link 22, the other end of the third leg link 23 is hinged to one end of the fifth leg link 25, a middle part of the fifth leg link 25 is hinged to a middle part of the fourth leg link 24, the other end of the fifth leg link 25 is hinged to one end of a sixth leg link 26, the other end of the sixth leg link 26 is hinged to one end of the footrest connecting component 27, the other end of the footrest connecting component 27 is hinged to one end of the fourth leg link 24, and the other end of the fourth leg link 24 is hinged to the other end of the second leg link 22.

The driving device 12 described herein adopts an electric push rod, and the backrest frame 41 has a tilt angle steplessly adjustable a between 75° and 25°.

The working process of the present application is as follows:

In the sitting-posture state described in FIG. 1, if a user wants to adjust the seat posture, a controller (a prior art, not shown in the figure) can be used to control the driving device 12 to act to drive the driving rod 11 to move forward, the leg-foot assemblies 2 are then driven to extend forward. When the leg-foot assemblies 2 extend forward, the first leg links 21 drive the driving rods 5 to move forward by means of the first leg link transmission rod hinge shafts 211, thereby driving the backrest transmission rod hinge shafts 44 to move forward, so that the backrest frame 41 tilts backward relative to the backrest-seat frame hinge shafts 43, and the controller is turned off after the backrest frame 41 reaches an expected position or the backrest frame 41 stops tilting after reaching a maximum backward tilt angle (i.e., the lying-posture state shown in FIGS. 3 and 4). Similar operation can be performed to return the backrest frame to the sitting-posture state from the lying-posture state.

The parts not described in the present application are all prior art and will not be described in detail. Any simple deformation or combination of the technical features and technical solutions of the present application should be considered to fall within the scope of the present application.