Backrest lumbar support device

Abstract

The present invention discloses a backrest lumbar support device, which is characterized in that: it includes a backrest frame, a lumbar support assembly and a telescopic driving member; the lumbar support assembly includes a mounting pipe and a lumbar support, both ends of the mounting pipe are respectively fixed on two side plates of the backrest frame, a connecting member extending away from the lumbar support is connected to the middle position on the back surface of the lumbar support, and the middle part of the connecting member is pivotally connected to the mounting pipe; one end of the telescopic driving member is pivotally connected to the top plate of the backrest frame, and the other end is pivotally connected to the middle position at the rear end of the connecting member to drive the lumbar support to swing. The present invention can improve the stability of the force on the lumbar support, and further improve the comfort of supporting the user's waist.

Description

Technical Field

[0001] The present invention relates to the field of sofas, and particularly to a backrest lumbar support device. Background Art

[0002] Functional sofas generally include a backrest part, a seat cushion part, a footrest part, and a lumbar support part; these three parts are sequentially linked and change the angles between them so that the functional sofa can switch between three postures: sitting, semi-reclining, and lying. The switching of the functional sofa between the above three postures can allow the user's back, legs, and waist to obtain different-angle supports to improve the user's postural comfort.

[0003] In the prior art, the general structure of the lumbar support part includes a lumbar support, a connecting rod group, and a driving motor. Both ends of the lumbar support are fixed on the left and right backrest plates of the functional sofa through the connecting rod group. There is one driving motor, which is fixed on one of the backrest plates and connected to the connecting rod group on the corresponding backrest plate to drive the lumbar support to move through the connecting rod group. In this structure, driven by the driving motor, one group of connecting rod groups is the active connecting rod group, and the other group of connecting rod groups is the driven connecting rod group, resulting in uneven forces on the active connecting rod group, the driven connecting rod group, and both ends of the lumbar support, reducing the support stability and comfort of the lumbar support. At the same time, it will also cause problems of uneven force and easy damage, so further improvement is needed. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a backrest lumbar support device, which can improve the stability of the force on the lumbar support, and further improve the comfort of supporting the user's waist.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A backrest lumbar support device, characterized in that: it includes a backrest frame, a lumbar support assembly, and a telescopic driving member;

[0007] The lumbar support assembly includes a mounting tube and a lumbar support. Both ends of the mounting tube are respectively fixed on two side plates of the backrest frame. A connecting member extending away from the lumbar support is connected to the middle position on the back of the lumbar support, and the middle part of the connecting member is pivotally connected to the mounting tube;

[0008] One end of the telescopic driving member is pivotally connected to the top plate of the backrest frame, and the other end is pivotally connected to the middle position at the rear end of the connecting member to drive the lumbar support to swing.

[0009] Preferably, the connecting member is two symmetrically arranged connecting pieces and a pivot shaft provided at the rear end position of the two connecting pieces for the telescopic driving member to be pivotally connected.

[0010] Preferably, the mounting tube is provided with two fixing plates for connecting the connecting plate, the connecting plate is located on the inner side of the fixing plate, and the axial length of the pivot axis is greater than the distance between the two fixing plates to define the lower limit position of the rear end of the connecting plate.

[0011] Preferably, a buffer washer is mounted on the end of the pivot shaft.

[0012] Preferably, the front ends of the two connecting sheets are bent outward to the outside of the fixing sheet to define the lower limit position of the front ends of the connecting sheets.

[0013] The advantages of the present invention are as follows: the connecting piece is located at the center of the back of the lumbar support, and the telescopic driving piece is connected to the center of the connecting piece, so that the lumbar support and the connecting piece are evenly stressed, thereby improving the supporting strength, stability and comfort of the lumbar support. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the backrest lumbar support device provided in this embodiment in an unfolded state;

[0015] Figure 2 This is a schematic diagram of the lumbar support device of the backrest provided in this embodiment in a folded state. DETAILED DESCRIPTION

[0016] Combination Figures 1 to 2 The backrest lumbar support device of the present invention is further described.

[0017] A backrest lumbar support device, characterized in that it includes a backrest frame 1, a lumbar support assembly 3 and a telescopic drive member 2. The backrest frame 1 is composed of a left side plate, a right side plate, a top plate and a bottom plate. The lumbar support assembly 3 includes a mounting tube 31 and a lumbar support 32, the two ends of the mounting tube 31 are respectively fixed to the left side plate and the right side plate of the backrest frame 1 by bolts, and a connecting member 321 extending back to the lumbar support 32 is connected to the left and right center position of the back side of the lumbar support 32 by bolts or welding, and the connecting member 321 is pivotally connected to the mounting tube 31 near the middle of the length direction. The telescopic drive member 2 is a push rod motor, the motor end of the push rod motor is pivotally connected to the pivot seat of the top plate, and the piston rod end of the push rod motor is pivotally connected to the left and right center position of the rear end of the connecting member 321 to drive the lumbar support 32 to swing.

[0018] Specifically, the connecting member 321 includes two symmetrically arranged connecting pieces 3211 on the left and right and a pivot shaft 3213 disposed at the rear ends of the two connecting pieces 3211 for pivotally connecting the telescopic driving member 2. Two fixing pieces 311 for pivotally connecting the connecting pieces 3211 through a pin shaft are welded on the mounting pipe 31. The connecting pieces 3211 are located inside the fixing pieces 311, and the axial length of the pivot shaft 3213 is greater than the distance between the two fixing pieces 311. When the rear end of the connecting member 321 swings downward to a certain height, the end position of the pivot shaft 3213 will abut against the top surface of the fixing piece 311 to define the lower limit position, i.e., the unfolded position, of the rear end of the connecting piece 3211.

[0019] A buffer washer 3214 is sleeved on the end position of the pivot shaft 3213, and the end of the pivot shaft 3213 abuts against the fixing piece 311 through the buffer washer 3214 to perform shock absorption and buffering.

[0020] The front ends of the fixing pieces 311 are bent upward as 3111, and the front end parts of the two connecting pieces 3211 are bent outward as 3212 to the outside of the fixing pieces 311. When the front ends of the connecting pieces 3211 swing downward to a certain height, the bent parts will abut against the front end surfaces of the fixing pieces 311 to define the lower limit position, i.e., the folded position, of the front ends of the connecting pieces 3211. The upward bending of the front ends of the fixing pieces 311 can provide a front side for the bent parts to support after the front ends of the connecting pieces 3211 swing downward, so as to control the reasonable height of the swing of the lumbar support 32.

[0021] Based on the above structure, the connecting member 321 is located at the central position on the back surface of the lumbar support 32, and the telescopic driving member 2 is connected to the central position of the connecting member 321, which can make the lumbar support 32 and the connecting member 321 receive uniform force, and improve the support strength, stability and comfort of the lumbar support 32.

[0022] Unless otherwise specified, in the present invention, if there are terms such as "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for exemplary illustration and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood in combination with the drawings and according to specific circumstances.

[0023] Unless otherwise clearly specified and defined, in the present invention, if there are terms such as "arranged", "connected" and "coupled", they should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0024] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and modifications made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A backrest lumbar support device, characterized in that: It includes a backrest frame, a lumbar support assembly and a telescopic drive member; The lumbar support assembly includes a mounting tube and a lumbar support. Both ends of the mounting tube are respectively fixed on two side plates of the backrest frame. A connecting member extending away from the lumbar support is connected to the middle position on the back surface of the lumbar support, and the middle part of the connecting member is pivotally connected to the mounting tube; One end of the telescopic drive member is pivotally connected to the top plate of the backrest frame, and the other end is pivotally connected to the middle position at the rear end of the connecting member to drive the lumbar support to swing; The connecting member is composed of two symmetrically arranged connecting pieces and a pivot shaft arranged at the rear end positions of the two connecting pieces for the telescopic drive member to be pivotally connected; Two fixing pieces for connecting the connecting pieces are arranged on the mounting tube. The connecting pieces are located inside the fixing pieces, and the axial length of the pivot shaft is greater than the distance between the two fixing pieces to define the lower limit position of the rear end of the connecting piece; A buffer washer is sleeved on the end position of the pivot shaft; The front end parts of the two connecting pieces are bent outward to the outside of the fixing pieces to define the lower limit position of the front end of the connecting piece.

Images