ELECTRIC SEAT RACK

Abstract

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 comprising a leg-foot assembly and a transmission rod. The two leg-foot assemblies are installed on two sides of the seat frame support assembly and are respectively hinged to one ends of the corresponding transmission rods, 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 are respectively connected to the two leg-foot assemblies; the seat frame support assembly comprises two quadrilateral support frames symmetrically arranged on two sides and a connecting assembly for fixing the two quadrilateral support frames into one. The backrest assembly includes a backrest frame and backrest connecting components.

Claims

1. An electric seat rack, comprising a driving assembly, a seat frame support assembly, a backrest assembly and two mechanical extension units symmetrically arranged on left and right, the backrest assembly being hinged to the seat frame support assembly, each of the two mechanical extension units comprising a leg-foot assembly and a transmission rod, wherein two leg-foot assemblies are respectively installed on two sides of the seat frame support assembly and are respectively hinged to first ends of transmission rods, and second 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; and the seat frame support assembly comprises two quadrilateral support frames symmetrically arranged on two sides and a connecting assembly for fixing the two quadrilateral support frames into one.

2. The electric seat rack according to claim 1, wherein a connecting assembly of the seat frame support assembly comprises 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 fixedly connected to the two quadrilateral support frames.

3. The electric seat rack according to claim 2, wherein the driving assembly further comprises 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.

4. The electric seat rack according to claim 1, wherein the backrest assembly comprises 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; other ends of the backrest connecting components are hinged to the seat frame support assembly by backrest-seat frame hinge shafts.

5. The electric seat rack according to claim 1, wherein each of the two leg-foot assemblies 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; and first 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 the first end of the transmission rod through a first leg link transmission rod hinge shaft, a second end of the first leg link is hinged to a first 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, a second end of the third leg link is hinged to a first 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, a second end of the fifth leg link is hinged to a first end of a sixth leg link, a second end of the sixth leg link is hinged to a first end of the footrest connecting component, a second end of the footrest connecting component is hinged to a first end of the fourth leg link, and a second end of the fourth leg link is hinged to a second end of the second leg link.

6. The electric seat rack according to claim 3, wherein the driving device adopts an electric push rod, and a backrest frame has a tilt angle steplessly adjustable a between 75 and 25.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] 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.

[0012] FIG. 2 is a side view of the electric seat rack in an embodiment of the present application in a sitting-posture state.

[0013] 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.

[0014] FIG. 4 is a side view of the electric seat rack in an embodiment of the present application in a lying-posture state.

[0015] In the figures, [0016] 1driving assembly; 11driving rod; 12driving device; 2leg-foot assembly; 21first leg link; 211first leg link transmission rod hinge shaft; 22second leg link; 23third leg link; 24fourth leg link; 25fifth leg link; 26sixth leg link; 27footrest connecting component; 3seat frame support assembly; 31quadrilateral support frames on two sides; 32connecting assembly for fixing the two quadrilateral support frames into one; 321front upper connecting component; 322front lower connecting component; 323rear upper connecting component; 324rear middle connecting component; 4backrest assembly; 41backrest frame; 42backrest connecting component; 43backrest-seat frame hinge shaft; 44backrest transmission rod hinge shaft; 45bolt; 5transmission rod; tilt angle of backrest frame.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] The working process of the present application is as follows:

[0025] 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.

[0026] 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.