Wheelchair backrest support connecting structure

Abstract

A wheelchair backrest support connecting structure comprises a connecting plate arranged on a connecting part in a sleeving mode, a fixing base installed on the upper portion of the connecting plate and a supporting block installed on the lower portion of the connecting plate, an installing hole is formed in the fixing base, and a backrest support is inserted into the installing hole. The supporting block vertically extends downwards, wheelchair rear wheels are installed on the supporting block, and therefore supporting is formed. A connecting structure composed of the connecting plate, the fixing base and the supporting block is adopted, and a traditional welding connecting mode is replaced; the problems of backrest breakage and looseness or breakage of the connecting position caused by residual stress and deformation accumulation of a welding structure in long-term use are avoided, the stability of the wheelchair backrest support connecting structure is improved, the service life of the wheelchair backrest support connecting structure is prolonged, and the safety of a user with mobility difficulties is guaranteed. Meanwhile, the connecting structure is convenient to disassemble, the difficulty and cost of replacing and maintaining the backrest are reduced, and high practicability and popularization value are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wheelchair technical field, concretely relates to a wheelchair backrest support connecting structure. BACKGROUND

[0002] The modern wheelchair frame is not only light and firm, but also has height adjustability, which can meet the specific needs of different users. However, although the wheelchair technology is constantly developing, the backrest support connecting structure of the existing wheelchair still has some deficiencies. Referring to the utility model patent with patent application number 202410884912.3, a nursing wheelchair that can assist leg stretching is disclosed. The wheelchair in this structure is similar to the common wheelchair on the market. The backrest is directly connected with the chair frame body by welding. This connection method has hidden dangers in structural stability. Residual stress and deformation may gradually accumulate in the welding structure during long-term use, making the backrest more prone to breakage when subjected to dynamic load. This leads to loosening or breakage at the connection between the backrest and the chair frame, affecting the service life of the wheelchair and posing certain safety hazards to users with limited mobility.

[0003] In terms of maintenance, the welding structure is difficult to disassemble. If the backrest needs to be replaced or repaired, the original welding points need to be damaged, increasing the maintenance cost and difficulty. UTILITY MODEL CONTENTS

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a wheelchair backrest support connecting structure.

[0005] The utility model solves the technical problems by adopting the following technical scheme:

[0006] A wheelchair backrest support connecting structure, comprising a connecting plate sleeved on a connecting part, a fixed seat installed on the upper part of the connecting plate, and a support block installed on the lower part of the connecting plate, the fixed seat is provided with a mounting hole, the backrest support is inserted into the mounting hole, the support block extends vertically downward and is provided with a wheelchair rear wheel installed thereon to form a support, the connecting plate is provided with a U-shaped groove with an opening facing downward, the connecting plate is sleeved on the connecting part through the U-shaped groove, and a bolt is used to fix the connecting part from the side of the connecting plate and the U-shaped groove, the connecting part is provided with a plurality of limiting holes arranged in the front and rear directions, the limiting holes pass through the connecting part from left to right, a plurality of connecting holes corresponding to the limiting holes are provided on the two side walls of the U-shaped groove on the connecting plate, the bolt passes through the connecting hole on one side into the U-shaped groove, then passes through the limiting hole and comes out from the connecting hole on the other side, and the bolt that comes out is fixed by screwing the nut.

[0007] The utility model discloses a fixing seat includes the connecting block of horizontal arrangement and the connecting column of vertical arrangement in the upper portion of connecting block, the mounting hole is arranged on the connecting column, the connecting block and connecting column integrated, and be equipped with the reinforcing rib of connecting with connecting block in the rear portion of connecting column, when the fixing seat installs in the upper portion of connecting plate, passes through bolt and is fixedly connected with connecting plate through connecting block, the top of connecting plate is equipped with a plurality of positioning hole of arranging along the front -back direction, and the bolt is fixed in one or more positioning holes and forms the fixed through the rotation of connecting block.

[0008] Further, the upper portion of the connecting plate is also provided with a limiting surface extending in the front-back direction, the limiting surface is a trapezoidal surface, the bottom of the connecting block is provided with a trapezoidal groove matched with the limiting surface, and a plurality of the positioning holes are arranged on the planar structure at the top of the limiting surface.

[0009] In the utility model, the support block includes two symmetrically matched support plates, the top of each of the two support plates is provided with a notch, and the two notches form an installation opening opening upward after being matched.

[0010] Further, assembly grooves extending in the front-back direction are arranged on the two sides of the connecting plate, the connecting holes are distributed along the assembly grooves, the notch at the top of the left support plate is correspondingly installed in the assembly groove on the left side of the connecting plate, and is fixedly connected with the connecting hole on the left side through a bolt, and the notch at the top of the right support plate is correspondingly installed in the assembly groove on the right side of the connecting plate, and is fixedly connected with the connecting hole on the right side through a bolt.

[0011] Further, the lower portion of the support block is connected with the chair frame body to form a stable support structure, and a plurality of axle holes for installing rear wheels are arranged on the support block.

[0012] The utility model has the following advantages and beneficial effects:

[0013] By adopting the connecting structure composed of the connecting plate, the fixing seat and the support block, the traditional welding connection mode is replaced, the problem that the residual stress and deformation accumulation of the welding structure in long-term use leads to the fracture of the backrest, the loosening or fracture of the connecting portion is avoided, the stability and service life of the wheelchair backrest support connecting structure are improved, and the safety of the user with difficulty in movement is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model will be further described in connection with the drawings and embodiments:

[0015] Figure 1 Figure 3 is a schematic view of the connection structure in the wheelchair according to the embodiment of the present application;

[0016] Figure 2 Figure 4 is a schematic view of the disassembly of the connection structure according to the embodiment of the present application;

[0017] Figure 3 Figure 5 is a schematic view of the structure of the connection plate according to the embodiment of the present application;

[0018] Figure 4 Figure 6 is a schematic view of the structure of the fixing seat according to the embodiment of the present application;

[0019] Figure 5 Figure 7 is a schematic view of the bottom structure of the fixing seat according to the embodiment of the present application;

[0020] Figure 6 Figure 8 is a schematic view of the structure of the support plate according to the embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application, and the present application is not limited to the following embodiments.

[0022] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, top, bottom, inner, outer, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0023] In addition, if the embodiments of the present application involve descriptions of "first" or "second" and the like, the descriptions of "first" or "second" and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled persons in the art, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0024] As Figures 1 to 6As shown, the embodiment discloses a wheelchair backrest support connecting structure, the backrest support 1 is connected at the rear of the chair frame main body 2 through the connecting structure 3, the backrest support 1 and the chair frame main body 2 are both spliced by a plurality of circular hollow steel pipes, a connecting part 20 formed by the hollow steel pipe extending outward horizontally is arranged at the rear end of the chair frame main body 2, the connecting structure 3 specifically comprises a connecting plate 31 sleeved on the connecting part 20, a fixing seat 32 installed on the upper part of the connecting plate 31 and a supporting block 33 installed on the lower part of the connecting plate 31, the fixing seat 32 is provided with a mounting hole 320, the backrest support 1 is inserted and mounted in the mounting hole 320, the supporting block 33 extends vertically downward and the rear wheel of the wheelchair is installed thereon to form support, the connecting plate 31 is sleeved on the connecting part 20 through the U-shaped groove 310 with the opening downward, and then fixed by the bolt penetrating the connecting plate 31 and the connecting part 20 in the U-shaped groove 310 from the side, specifically, a plurality of limiting holes 200 arranged in the front-rear direction are arranged on the connecting part 20, the limiting holes 200 penetrate the connecting part 20 left and right, a plurality of connecting holes 311 corresponding to the limiting holes 200 are arranged on the two side walls of the U-shaped groove 310 on the connecting plate 31, the bolt penetrates into the U-shaped groove 310 from one side connecting hole 311, penetrates the limiting hole 200 and then penetrates out from the other side connecting hole 311, and the penetrating part of the bolt is fixed by screwing the nut, the corresponding installation of the plurality of connecting holes 311 and the limiting holes 200 can improve the connection stability.

[0025] Further, the fixing seat 32 comprises a connecting block 321 arranged horizontally and a connecting column 322 arranged vertically above the connecting block 321, the mounting hole 320 is arranged on the connecting column 322, the connecting block 321 and the connecting column 322 are integrally formed, and a reinforcing rib 323 connected with the connecting block 321 is arranged at the rear of the connecting column 322, when the fixing seat 32 is installed on the upper part of the connecting plate 31, the connecting block 321 is fixedly connected with the connecting plate 31 by the bolt, in addition, one of the bolts is connected with the connecting plate 31 after penetrating the connecting block 321 from top to bottom in the mounting hole 320, specifically, a plurality of positioning holes 312 arranged in the front-rear direction are arranged on the top of the connecting plate 31, the bolt is fixed in one or more of the positioning holes 312 after penetrating the connecting block 321 and being screwed.

[0026] Further, in order to facilitate the installation of the fixing seat 32, a limiting surface 313 extending in the front-rear direction is further arranged on the upper part of the connecting plate 31, the limiting surface 313 is specifically a trapezoidal surface, a trapezoidal groove 324 matched with the limiting surface 313 is arranged on the bottom of the connecting block 321, and a plurality of the positioning holes 312 are arranged on the planar structure on the top of the limiting surface 313.

[0027] In the embodiment, the support block 33 comprises two symmetrical support plates 331, the top of each of the two support plates 331 is provided with a notch, and the two notches form an installation opening 330 with the opening upward after being matched, the support block 33 is installed on the lower part of the connecting plate 31 through the installation opening 330, specifically, the connecting plate 31 is provided with an assembly groove 314 extending along the front and back direction on each side, the connecting holes 311 are distributed along the assembly groove 314, the notch on the top of the left support plate 331 is installed in the assembly groove 314 on the left side of the connecting plate 31, and is connected and fixed with the left connecting hole 311 through a bolt, the notch on the top of the right support plate 331 is installed in the assembly groove 314 on the right side of the connecting plate 31, and is connected and fixed with the right connecting hole 311 through a bolt, in addition, the two support plates 331 are connected and fixed through a bolt to form a whole.

[0028] Further, the lower part of the support block 33 is connected with the chair frame body 2 to form a stable support structure, and the support block 33 is provided with a plurality of wheel shaft holes 332 for installing rear wheels, the rotating shaft of the wheelchair rear wheel is fixed in the wheel shaft hole 332 in the middle part of the support block 33, and the plurality of wheel shaft holes 332 can also reduce the overall weight while ensuring the stability of the structure of the support block 33.

[0029] The above described in the specification of the present application is only an example of the present application, and the skilled in the art can make various modifications or supplements or adopt similar ways to replace the described specific embodiments, as long as it does not deviate from the content of the specification of the present application or exceed the scope defined by the claims, and it shall belong to the protection scope of the present application.

Claims

1. A wheelchair backrest support connection structure, characterized in that, The backrest support (1) is inserted into the mounting hole (320), the support block (33) extends vertically downward and the rear wheel of the wheelchair is installed thereon to form a support, the connecting plate (31) is provided with a downward-opening U-shaped groove (310), the connecting plate (31) is sleeved on the connecting portion (20) through the U-shaped groove (310), and the connecting portion (20) is fixed by bolts penetrating the connecting plate (31) and the connecting portion (20) in the U-shaped groove (310) from the side, the connecting portion (20) is provided with a plurality of limiting holes (200) arranged in the front-rear direction, the limiting holes (200) penetrate the connecting portion (20) left and right, the connecting plate (31) is provided with a plurality of connecting holes (311) corresponding to the limiting holes (200) on the two side walls of the U-shaped groove (310), the bolt penetrates the connecting hole (311) on one side into the U-shaped groove (310), penetrates the limiting hole (200) and then penetrates out of the connecting hole (311) on the other side, and the bolt penetrating out is fixed by screwing the nut.

2. The wheelchair backrest support connecting structure according to claim 1, characterized in that, The fixing seat (32) comprises a connecting block (321) arranged horizontally and a connecting column (322) arranged vertically above the connecting block (321), the mounting hole (320) is arranged on the connecting column (322), the connecting block (321) and the connecting column (322) are integrally formed, and a reinforcing rib (323) connected with the connecting block (321) is arranged at the rear of the connecting column (322), when the fixing seat (32) is installed on the upper portion of the connecting plate (31), the connecting block (321) is fixedly connected with the connecting plate (31) by the bolt, the top of the connecting plate (31) is provided with a plurality of positioning holes (312) arranged in the front-rear direction, the bolt is fixed in one or more positioning holes (312) by screwing after penetrating the connecting block (321) to form a fixing.

3. The wheelchair backrest support connection structure according to claim 2, characterized in that A limiting surface (313) extending in the front-rear direction is further arranged on the upper portion of the connecting plate (31), the limiting surface (313) is a trapezoidal surface, a trapezoidal groove (324) matched with the limiting surface (313) is arranged at the bottom of the connecting block (321), and a plurality of the positioning holes (312) are arranged on the planar structure at the top of the limiting surface (313).

4. The wheelchair backrest support connecting structure according to claim 1, characterized in that, The support block (33) comprises two symmetrical support plates (331), the top of each of the two support plates (331) is provided with a notch, and the two notches are matched to form an installation opening (330) with an upward opening, the support block (33) is installed on the lower portion of the connecting plate (31) through the installation opening (330), and the two support plates (331) are fixedly connected by bolts to form a whole.

5. The wheelchair backrest support connection structure according to claim 4, wherein Assembly grooves (314) extending in the front-rear direction are arranged on both sides of the connecting plate (31), the connecting holes (311) are arranged along the assembly grooves (314), the notch at the top of the left support plate (331) is arranged in the assembly groove (314) on the left side of the connecting plate (31) and is fixed by being connected with the connecting hole (311) on the left side through a bolt, and the notch at the top of the right support plate (331) is arranged in the assembly groove (314) on the right side of the connecting plate (31) and is fixed by being connected with the connecting hole (311) on the right side through a bolt.

6. The wheelchair backrest support connection structure according to claim 5, wherein The lower part of the support block (33) is connected with the chair frame body (2) to form a stable support structure, and a plurality of wheel shaft holes (332) for mounting rear wheels are arranged on the support block (33), and the rotating shafts of the rear wheels of the wheelchair are fixed in the wheel shaft holes (332) in the middle part of the support block (33).

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