CN216725006U

CN216725006U - Folding and locking structure of backrest frame of wheelchair and folding wheelchair

Info

Publication number: CN216725006U
Application number: CN202122400029.7U
Authority: CN
Inventors: 朱靖果; 唐树果; 胡金航
Original assignee: Zhejiang Yingluohua Rehabilitation Equipment Co ltd
Current assignee: Zhejiang Yingluohua Rehabilitation Equipment Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-06-14
Anticipated expiration: 2031-09-30

Abstract

The utility model relates to a folding and locking structure of a backrest frame of a wheelchair and a folding wheelchair. The utility model provides a wheelchair back-to-back frame folding locking structure, includes and leans against the frame with cushion frame rear end articulated, cushion frame downside folding connection has the support frame, the support frame is including being located the back support body that leans against the frame downside, the back-to-back frame left and right sides all has downwardly extending's extension section, and two extension sections are connected with the connecting rod that extends along controlling the direction, back support body upper end is fixed with the connecting block, the connecting block is constituted to the support breach that runs through about to the upper shed, the connecting rod is located and supports the breach, the articulated connecting rod front end that is fixed in of connecting block front side, be equipped with hasp board, first cooperation axle and second cooperation axle on connecting rod and the back support body. The utility model has the advantages that the step that a user forgets to lock the backrest is avoided, the automatic locking of the backrest can be realized after the backrest frame is unfolded, and the safety of the wheelchair in use is ensured.

Description

Folding and locking structure of backrest frame of wheelchair and folding wheelchair

Technical Field

The utility model relates to a folding and locking structure of a backrest frame of a wheelchair and a folding wheelchair.

Background

The backrest frame of the folding wheelchair can be folded, and a locking structure is required to be arranged at the backrest frame to keep the structure of the wheelchair unchanged in the process of normal running state. The existing locking structure can be manually locked by a user, particularly a manually folded wheelchair, the unfolding of the wheelchair and the locking of a backrest frame are two steps, the user needs to manually lock the structure after completing the unfolding of the whole wheelchair, and sometimes the user forgets to lock the backrest frame after completing the unfolding of the backrest frame, so that potential safety hazards exist.

Disclosure of Invention

The utility model aims to provide a folding and locking structure of a wheelchair backrest frame, which can realize automatic locking after the backrest frame is unfolded so as to limit the folding of the backrest frame.

In order to achieve the purpose, the utility model adopts the following technical scheme: a folding and locking structure of a backrest of a wheelchair comprises a backrest frame hinged with the rear end of the backrest frame, a support frame is connected with the lower side of the backrest frame in a folding way, the support frame comprises a rear frame body positioned on the lower side of the backrest frame, the left side and the right side of the backrest frame are respectively provided with an extension section extending downwards, a connecting rod extending along the left direction and the right direction is connected between the two extension sections, a connecting block is fixed at the upper end of the rear frame body, the connecting block is provided with a supporting notch which is opened upwards and penetrates through the left side and the right side, the connecting rod is positioned in the supporting notch, the front end of the connecting block is hinged and fixed at the front side of the connecting rod, a lock catch plate, a first matching shaft and a second matching shaft are arranged between the connecting rod and the upper end of the rear frame body, one of the two matching shafts of the first matching shaft and the second matching shaft is arranged at the rear side of the connecting rod, the other matching shaft of the two matching shafts of the first matching shaft and the second matching shaft is arranged at the rear side of the upper end of the rear frame body, one end of the lock catch plate is rotationally fixed and matched with a torsion spring by taking the first matching shaft as a center, the other end of the lock catch plate is provided with a lock catch bulge extending forwards, and the lock catch plate rotates under the action of the torsion spring and enables the second matching shaft to abut against the included angle between the lock catch bulge and the lock catch plate.

After the backrest frame of the wheelchair is unfolded, namely the connecting rod of the backrest frame is supported in the supporting notch of the connecting block, the locking plate can automatically rotate under the action of the torsion spring so as to be buckled on the second matching shaft, and the second matching shaft is abutted between the locking plate and the locking part bulge; the connecting rod of the backrest frame is hinged with the rear frame body with the connecting block, so that the backrest frame and the rear frame body are automatically locked and fixed, a user is prevented from forgetting to perform locking operation, and the safety of the wheelchair in use is ensured. The lock catch plate is matched with the torsion spring, so that when the backrest frame is unfolded, the lock catch plate can interfere with the connecting rod of the backrest frame or the upper end of the rear frame body, and a user must pull the lock catch plate when the backrest frame is unfolded, so that the situation that the user forgets to pull the lock catch plate is avoided.

Preferably, the matching part of the lock catch plate and the first matching shaft is provided with a first limiting bulge and a second limiting bulge which extend forwards, and the first limiting bulge and the second limiting bulge are arranged at an upper-lower interval. The first limiting bulge and the second limiting bulge which are spaced up and down are used for realizing the upper limiting and the lower limiting of the lock catch plate so as to avoid the excessive rotation of the lock catch plate, thereby ensuring the service life of the torsion spring and ensuring that the contact position of the second matching shaft, the lock catch plate and the included angle of the lock catch part is not changed.

Preferably, the first matching shaft is arranged on the first connecting seat, the first connecting seat comprises a first connecting portion and a second connecting portion, the first connecting portion is arranged on the left side and the right side of the first connecting portion, the first connecting portion is arranged between the two first connecting portions, two ends of the first matching shaft are connected with the first connecting portion respectively, and the first limiting protrusion and the second limiting protrusion are arranged on the rear side of the second connecting portion and between the two first connecting portions. The arrangement is such that the first and second limit projections can be arranged shorter.

Preferably, a limiting shaft is fixed between the two first connecting parts, and the limiting shaft is located on the front side of the first matching shaft and located between the first limiting protrusion and the second limiting protrusion. The limiting shaft is used for avoiding the first limiting bulge and the second limiting bulge from excessively rotating.

Preferably, the front end of the connecting block extends forwards and upwards, a second connecting seat is fixed on the front side of the connecting rod, the connecting block is hinged to the second connecting seat, and a hinge shaft at the second connecting seat is arranged along the left-right direction.

Preferably, the support notch has an arc surface shape and a contact surface matched with the connecting rod. The cambered surface-shaped contact surface is matched with the tubular connecting rod and can also play a role in front and back limiting.

Preferably, the support notch is provided with a concave fixing groove, a buffer block is arranged in the fixing groove, and the upper end surface of the buffer block is of an arc-surface-shaped structure with an upward opening. The arrangement is used for avoiding the abrasion of the lower end surface of the connecting rod.

The utility model discloses a folding wheelchair with the folding and locking structure of the backrest frame of the wheelchair, wherein the supporting frames comprise supporting rods which are positioned at the left side and the right side of the cushion frame and extend downwards from front to back, the front ends of the supporting rods are hinged with the upper ends of front wheel fixing rods, the positions of the supporting rods deviating from the front ends are hinged with the front ends of the cushion frame, the lower ends of the supporting rods are used for connecting rear wheels, the rear frame body is arranged between the two supporting rods, a positioning rod is arranged between the position of the front wheel fixing rod deviating from the front ends and the rear frame body, and the front end and the rear end of the positioning rod are respectively hinged and fixed with the front wheel fixing rods and the rear frame body. The utility model discloses a locking structure can be used for the locking of whole wheelchair after expanding.

Preferably, the connecting rod deviates from the lower end of the extension section, and the lower end of the extension section extends to the side of the rear frame body. The part of the extension section below the connecting rod can be used as a handle, so that a user can turn over the backrest frame conveniently.

The utility model has the advantages that the step that a user forgets to lock the backrest is avoided, the automatic locking of the backrest can be realized after the backrest frame is unfolded, and the safety of the wheelchair in use is ensured.

Drawings

FIG. 1 is a schematic view of a wheelchair in accordance with the present invention;

FIG. 2 is a schematic view of a backrest frame folding and locking structure of the wheelchair of the present invention;

fig. 3 is a schematic structural view of the upper end of the rear frame body according to the present invention.

Detailed Description

The utility model is further described below with reference to the figures and specific embodiments.

As shown in fig. 1 to 3, the folding wheelchair of the present invention includes a backrest 10 hinged to the rear end of a cushion frame 11, a support frame is connected to the lower side of the cushion frame 11 in a folding manner, the support frame includes support rods 12 located on the left and right sides of the cushion frame 11 and extending downward from front to back, the front ends of the support rods 12 are hinged to the upper ends of front wheel fixing rods 13, the positions of the support rods 12 deviating from the front ends are hinged to the front end of the cushion frame 11, the lower ends of the support rods 12 are used for connecting rear wheels 14, a rear frame body 15 extending upward is fixed between the rear ends of the two support rods 12, a positioning rod 16 is arranged between the position of the front wheel fixing rod 13 deviating from the front ends and the rear frame body 15, and the front and rear ends of the positioning rod 16 are respectively hinged to the front wheel fixing rods 13 and the rear frame body 15.

The wheelchair backrest frame folding and locking structure comprises a backrest frame 10 and a rear frame body 15, wherein the left side and the right side of the backrest frame 10 are respectively provided with an extension section 3 extending downwards, a connecting rod 31 extending along the left-right direction is connected between the two extension sections 3, the upper end of the rear frame body 15 is fixed with a connecting block 2, the connecting block 2 is provided with a supporting notch 21 which is opened upwards and penetrates through the connecting block 2 from left to right, the connecting rod 31 is positioned in the supporting notch 21, and the front end of the connecting block 2 is hinged and fixed on the front side of the connecting rod 31. Wherein, connecting rod 31 is located the upside of extension 3 lower extremes, and 3 lower extremes of extension extend to the side of after-frame body 15.

A lock catch plate 41, a first matching shaft 42 and a second matching shaft 51 are arranged between the connecting rod 31 and the upper end of the rear frame body 15, the first matching shaft 42 is rotationally fixed at the rear side of the connecting rod 31, the second matching shaft 41 is rotationally fixed at the rear side of the upper end of the rear frame body 15, the upper end of the lock catch plate 41 is sleeved outside the first matching shaft 42, the lock catch plate 41 can be rotationally fixed and matched with a torsion spring (not shown) by taking the first matching shaft 42 as a center, the other end of the lock catch plate 41 is provided with a lock catch bulge 410 extending forwards, and the lock catch plate 41 rotates under the action of the torsion spring and enables the second matching shaft 51 to abut against the included angle between the lock catch bulge 410 and the lock catch plate 41.

The first mating shaft 42 is disposed on the first connecting base 4, the first connecting base 4 includes a first connecting portion 401 and a second connecting portion 402, the first connecting portion 401 is disposed between the first connecting portions 401, and two ends of the first mating shaft 42 are rotatably connected to the first connecting portion 401.

The second matching shaft 51 is disposed on the third connecting seat 5, the third connecting seat 5 includes a third connecting portion 501 and a fourth connecting portion 502 located between the two third connecting portions 501, the third connecting portion 501 is disposed opposite to the left and right, and two ends of the second matching shaft 51 are fixed to a fourth connecting portion 401.

The upper end of the locking plate 41 has a first limiting protrusion 411 and a second limiting protrusion 412 extending forward, the first limiting protrusion 411 and the second limiting protrusion 412 are spaced up and down, and the first limiting protrusion 411 and the second limiting protrusion 412 are located at the rear side of the second connecting portion 402 and between the two first connecting portions 401. A limiting shaft 403 is fixed between the two first connecting portions 401, and the limiting shaft 403 is located at the front side of the first mating shaft 42 and located between the first limiting protrusion 411 and the second limiting protrusion 412. The first connecting portion 401 further has a fixing hole 404 penetrating left and right to fix the end of the torsion spring.

The front end of the connecting block 2 extends forwards and upwards, the front side of the connecting rod 31 is fixed with a second connecting seat 6, and the connecting block is hinged with the second connecting seat and the hinged shaft 61 at the second connecting seat is arranged along the left-right direction. A concave fixing groove is arranged at the position of the supporting notch 21, a buffer block 22 is arranged in the fixing groove, and the upper end surface of the buffer block 22 is of an arc surface-shaped structure with an upward opening.

Claims

1. A folding and locking structure of a backrest of a wheelchair is characterized by comprising a backrest frame hinged with the rear end of the backrest frame, a support frame is connected to the lower side of the backrest frame in a folding manner, the support frame comprises a rear frame body positioned on the lower side of the backrest frame, the left side and the right side of the backrest frame are respectively provided with an extension section extending downwards, a connecting rod extending along the left direction and the right direction is connected between the two extension sections, a connecting block is fixed at the upper end of the rear frame body, the connecting block is provided with a supporting notch which is opened upwards and penetrates through the left side and the right side, the connecting rod is positioned in the supporting notch, the front end of the connecting block is hinged and fixed at the front side of the connecting rod, a lock catch plate, a first matching shaft and a second matching shaft are arranged between the connecting rod and the upper end of the rear frame body, one matching shaft of two matching shafts of the first matching shaft and the second matching shaft is arranged at the rear side of the connecting rod, the other matching shaft of the first matching shaft and the second matching shaft is arranged at the rear side of the upper end of the rear frame body, one end of the lock catch plate is rotationally fixed and matched with a torsion spring by taking the first matching shaft as a center, the other end of the lock catch plate is provided with a lock catch bulge extending forwards, and the lock catch plate rotates under the action of the torsion spring and enables the second matching shaft to abut against the included angle between the lock catch bulge and the lock catch plate.

2. The wheelchair backrest frame folding and locking structure as claimed in claim 1, wherein the fitting part of the latch plate and the first fitting shaft has a first limiting protrusion and a second limiting protrusion extending forward, and the first limiting protrusion and the second limiting protrusion are spaced up and down.

3. The folding and locking structure of the wheelchair backrest frame according to claim 2, wherein the first engaging shaft is provided on a first connecting base, the first connecting base comprises first connecting portions oppositely provided left and right and a second connecting portion located between the two first connecting portions, two ends of the first engaging shaft are respectively connected with one first connecting portion, and the first and second limiting protrusions are located on the rear side of the second connecting portion and between the two first connecting portions.

4. The wheelchair backrest frame folding and locking structure of claim 3, wherein a limiting shaft is fixed between the two first connecting parts, and the limiting shaft is located at the front side of the first matching shaft and between the first limiting protrusion and the second limiting protrusion.

5. The wheelchair back-rest folding and locking structure of claim 1, wherein the front end of the connecting block extends forward and upward, a second connecting seat is fixed to the front side of the connecting rod, the connecting block is hinged to the second connecting seat, and the hinge shaft at the second connecting seat is arranged in the left-right direction.

6. The wheelchair backrest frame folding and locking structure as claimed in claim 1, wherein the support notch has an arc shape and a contact surface for engaging with the connecting rod.

7. The wheelchair backrest frame folding and locking structure as claimed in claim 1 or 6, wherein the supporting notch is provided with a concave fixing groove, a buffer block is arranged in the fixing groove, and the upper end surface of the buffer block is in an arc surface shape with an upward opening.

8. A folding wheelchair with the wheelchair back-to-back frame folding locking structure of any one of claims 1 to 7, characterized in that the support frame is including the bracing piece that is located the cushion frame left and right sides and extends downwards after by preceding, the bracing piece front end is articulated with front wheel dead lever upper end, the skew front end department of bracing piece is articulated with cushion frame front end, the bracing piece lower extreme is used for connecting the rear wheel, the back support body sets up between two bracing pieces, be equipped with the locating lever between skew tip department of front wheel dead lever and back support body, both ends are articulated fixedly with front wheel dead lever and back support body respectively around the locating lever.

9. The folding wheelchair as claimed in claim 8, wherein the connecting rod is offset from a lower end of the extension section which extends to the side of the rear frame body.