CN117731494A - Left-right folding type foldable wheelchair - Google Patents

Abstract

The invention provides a left-right folding type foldable wheelchair, which comprises a side bracket, a wheel assembly, a seat assembly and a locking mechanism, wherein the side bracket comprises a bottom stay bar, a seat stay bar, a rear vertical rod and a front connecting rod; when the locking mechanism is unlocked, the side brackets on two sides can be mutually close along the left-right direction, so that the first connecting rod and the second connecting rod drive the first six-connecting-rod mechanism to act, left-right folding is realized, the structure is novel, and the occupied space after folding is small.

Description

A left and right foldable wheelchair

Technical field

The invention belongs to the technical field of medical devices, and specifically relates to a left-right foldable foldable wheelchair.

Background technique

Wheelchairs are medical devices that assist patient treatment and rehabilitation. In order to facilitate storage, foldable wheelchairs have appeared on the market. Most common foldable wheelchairs are front-to-back foldable. When folding or unfolding operations, they need to have a certain amount of space in the front-to-back direction. The operating space is not suitable in some cases. There are also some foldable wheelchairs that use left and right folding. However, these solutions generally occupy a large space after folding and are weak in rigidity when unfolded. There are certain safety hazards when used. .

Contents of the invention

The purpose of the present invention is to overcome one or more shortcomings in the prior art and provide a left-right folding foldable wheelchair that has a novel structure and takes up little space after folding.

In order to achieve the above object, the technical solution adopted by the present invention is a left and right foldable foldable wheelchair, which includes two side brackets on the left and right sides, a wheel assembly connected to the bottom of the side brackets, and a wheel assembly arranged on the two side brackets. The seat assembly between the side brackets, and the locking mechanism for locking the foldable wheelchair in the unfolded state, the side brackets include a bottom support rod extending in the horizontal direction, and a seat arranged in parallel above the bottom support rod A support rod, a rear upright connected to the rear end of the bottom support and the seat support and extending in the vertical direction, and a front link connecting the bottom support and the front end of the seat support. , the wheel assembly includes a front wheel assembly connected to the bottom of the front link and a rear wheel assembly connected to the bottom of the rear upright;

The seat assembly includes a first rod, a second rod, a third rod and a fourth rod extending in the left and right direction, the first rod and the second rod are located on the same vertical plane, and the third rod and the The fourth rod is located on the same vertical plane, the left end of the first rod is rotationally connected to the front end of the seat support of the left side bracket, and the right end of the first rod is connected to the second The left end of the rod is rotatably connected, the right end of the second rod is rotatably connected to the front end of the seat stay of the right side bracket, and the left end of the third rod is rotatably connected to the left end of the side bracket. The rear end of the seat stay is rotatably connected, the right end of the third rod is rotatably connected to the left end of the fourth rod, and the right end of the fourth rod is connected to the side bracket on the right side. The rear end of the seat stay is rotatably connected, so that the first rod, the second rod, the third rod, the fourth rod and the seat stays on both sides form a first six-bar linkage. ;

The seat assembly also includes a first connecting rod and a second connecting rod that cross in an X shape. The front end of the first connecting rod is rotationally connected to the middle part of the first rod. The front end of the second connecting rod is rotatably connected to the middle part of the fourth rod, the front end of the second connecting rod is rotatably connected to the middle part of the second rod, and the rear end of the second connecting rod is rotatably connected to the middle part of the third rod. Rotary connection;

When the locking mechanism is unlocked, the side brackets on both sides can move closer to each other in the left and right directions, so that the first link and the second link drive the first six-link mechanism to move, thereby achieving the desired effect. The left and right folding of the foldable wheelchair is described.

Preferably, the first rod and the second rod are staggered in the up-down direction, the third rod and the fourth rod are staggered in the up-down direction, the first rod and the fourth rod are located in the same horizontal plane, and the second rod and the third rod are located in the same horizontal plane.

Further preferably, the second connecting rod, the first rod and the fourth rod are located on the same horizontal plane.

Further preferably, the locking mechanism includes a locking pin detachably disposed at the right end of the third rod, the locking pin is located above the fourth rod and is connected to the locking pin disposed at the left end of the fourth rod. Corresponding to the locking holes, when the locking pin is inserted into the locking hole, the locking mechanism is locked, and when the locking pin is disengaged from the locking hole, the locking mechanism is unlocked.

Further preferably, the right end of the third rod is provided with a connecting plate extending horizontally to the right, the locking pin is pluggably inserted into the connecting plate, and the upper end surface of the locking pin is connected to the third rod. The highest points of the three poles are flush with each other.

Preferably, the seat assembly further includes fifth, sixth, seventh and eighth rods extending in the left and right direction, the fifth rod is located directly below the first rod, and the sixth rod Located directly below the second rod, the left end of the fifth rod is rotationally connected to the front end of the bottom support rod of the left side bracket, and the right end of the fifth rod is connected to the sixth The left end of the rod is rotationally connected, and the right end of the sixth rod is rotationally connected with the front end of the bottom support rod of the side bracket on the right side; the seventh rod is located directly below the third rod, so The eighth rod is located directly below the fourth rod. The left end of the seventh rod is rotationally connected to the rear end of the bottom support rod of the left side bracket. The right end of the eighth rod The left end of the seventh rod is rotatably connected, and the right end of the eighth rod is rotatably connected with the rear end of the bottom support rod of the side bracket on the right side, so that the fifth rod and the third rod are rotatably connected. The six rods, the seventh rod, the eighth rod and the bottom support rods on both sides constitute a second six-bar linkage.

Further preferably, the fifth rod and the sixth rod are staggered in the up and down direction, the seventh rod and the eighth rod are staggered in the up and down direction, and the fifth rod and the eighth rod are located at On the same horizontal plane, the sixth rod and the seventh rod are located on the same horizontal plane.

Further preferably, the seat assembly further includes a first vertical rod, a second vertical rod, a third vertical rod and a fourth vertical rod, and both ends of the first vertical rod are respectively connected with the first rod and the first vertical rod. The fifth rod is connected, the two ends of the second vertical rod are connected to the second rod and the sixth rod respectively, and the two ends of the third vertical rod are connected to the third rod and the sixth rod respectively. The seventh rod is connected, and both ends of the fourth vertical rod are connected to the fourth rod and the eighth rod respectively, so that the first six-link mechanism and the second six-link mechanism The rod mechanisms are connected to each other to form a stable support frame.

Further preferably, the first vertical pole and the third vertical pole are arranged close to the side bracket on the left side, and the second vertical pole and the fourth vertical pole are arranged close to the side bracket on the right side.

Preferably, the upper end of the rear upright extends obliquely backward and upward to form a push handle, and/or the side bracket further includes an armrest, and the front end of the armrest extends forward and downward and is connected with the The front end of the seat stay is connected, and the rear end of the armrest extends backward and is connected to the middle part of the rear upright.

Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art:

By making the seat assembly include a first rod, a second rod, a third rod and a fourth rod extending in the left and right direction, the first rod and the second rod are located on the same vertical plane, and the third rod and the fourth rod are located on the same Vertically, the left end of the first rod is rotatably connected to the front end of the seat stay of the left side bracket, the right end of the first rod is rotatably connected to the left end of the second rod, and the right end of the second rod is rotatably connected to The front end of the seat stay of the right side bracket is rotationally connected, so that the left end of the third rod is rotationally connected to the rear end of the seat stay of the left side bracket, so that the right end of the third rod is connected to the left end of the fourth rod. The right end of the fourth pole is rotatably connected to the rear end of the seat support pole of the right side bracket, so that the first pole, the second pole, the third pole, the fourth pole and the seat supports on both sides can be rotatably connected. The rods constitute a first six-bar linkage mechanism; by making the seat assembly also include a first connecting rod and a second connecting rod crossing in an X shape, the front end of the first connecting rod is rotationally connected to the middle part of the first rod, so that the first connecting rod The rear end of the connecting rod is rotationally connected to the middle part of the fourth rod, the front end of the second connecting rod is rotationally connected to the middle part of the second rod, and the rear end of the second connecting rod is rotationally connected to the middle part of the third rod; When the locking mechanism is unlocked, the side brackets on both sides can move closer to each other in the left and right directions, so that the first link and the second link drive the first six-link mechanism to realize the left and right folding of the foldable wheelchair. The structure is novel, because Each rod of the seat assembly is relatively short, allowing the foldable wheelchair to occupy less space after folding.

Description of drawings

Figure 1 is a schematic three-dimensional view of a preferred embodiment of the present invention. At this time, the foldable wheelchair is in an unfolded state.

FIG. 2 is a schematic top view of FIG. 1 .

FIG. 3 is a schematic diagram of an intermediate state during the process of converting the foldable wheelchair in FIG. 2 to a folded state.

FIG. 4 is a schematic diagram of the foldable wheelchair in FIG. 2 after it is transformed into a folded state.

Among them: 10. Side bracket; 11. Bottom stay; 12. Seat stay; 13. Rear vertical bar; 131. Push handle; 14. Front link; 15. Armrest bar; 21. Front wheel assembly; 22. Rear wheel assembly; 30. Seat assembly; 31. First rod; 32. Second rod; 33. Third rod; 331. Connecting plate; 34. Fourth rod; 35. First connecting rod; 36. Second connecting rod pole; 37. The fifth pole; 38. The sixth pole; 39. The seventh pole; 40. The eighth pole; 41. The first vertical pole; 42. The second vertical pole; 43. The third vertical pole; 44. The third Four vertical rods; 51. Locking pin.

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art.

The front and rear, up and down, and left and right directions described in the present invention are the front and rear, up and down, and left and right directions observed by the user when riding.

As shown in Figures 1 to 4, the left and right foldable wheelchair provided by the present invention includes two side brackets 10 on the left and right sides, a wheel assembly connected to the bottom of the side brackets 10, and a wheel assembly arranged on the two side brackets 10. Between the seat assembly 30 and the locking mechanism for locking the foldable wheelchair in the unfolded state, the side bracket 10 includes a bottom support bar 11 extending in the horizontal direction, and a seat support bar 12 arranged in parallel above the bottom support bar 11 , the rear upright 13 connected to the rear ends of the bottom stay 11 and the seat stay 12 and extending in the vertical direction, and the front link 14 connecting the front ends of the bottom stay 11 and the seat stay 12. The wheel assembly includes The front wheel assembly 21 connected to the bottom of the front link 14 and the rear wheel assembly 22 connected to the bottom of the rear upright 13; the seat assembly 30 includes a first rod 31, a second rod 32, a third rod 33 and a The fourth rod 34, the first rod 31 and the second rod 32 are located on the same vertical plane and have the same length, the third rod 33 and the fourth rod 34 are located on the same vertical plane and have the same length, the left end of the first rod 31 and the left The front end of the seat stay 12 of the side bracket 10 is rotationally connected, the right end of the first rod 31 is rotationally connected to the left end of the second rod 32, and the right end of the second rod 32 is connected to the seat stay of the right side bracket 10. The front end of 12 is rotatably connected, the left end of the third rod 33 is rotatably connected with the rear end of the seat stay 12 of the left side bracket 10, the right end of the third rod 33 is rotatably connected with the left end of the fourth rod 34, The right end of the fourth rod 34 is rotationally connected to the rear end of the seat stay 12 of the right side bracket 10, so that the first rod 31, the second rod 32, the third rod 33, the fourth rod 34 and the seats on both sides The support rod 12 constitutes a first six-link mechanism; the seat assembly 30 also includes a first link 35 and a second link 36 that cross in an X shape (the projection in the up and down direction is an X shape). The front end is rotationally connected to the middle part of the first rod 31, the rear end part of the first connecting rod 35 is rotationally connected to the middle part of the fourth rod 34, the front end part of the second connecting rod 36 is rotationally connected to the middle part of the second rod 32, The rear end of the second connecting rod 36 is rotationally connected to the middle part of the third rod 33.

The advantage of this arrangement is that when the locking mechanism is unlocked, the side brackets on both sides can move closer to each other in the left and right directions, so that the first link and the second link drive the first six-link mechanism to move, thereby realizing the foldable wheelchair. It folds left and right and has a novel structure. Since each rod of the seat assembly (the first rod, the second rod, the third rod, and the fourth rod) is relatively short, the foldable wheelchair takes up less space after being folded.

In order to improve the rigidity of the foldable wheelchair when unfolded and improve the support force of the seat assembly, the first rod 31 and the second rod 32 are staggered in the up and down direction, and the third rod 33 and the fourth rod 34 are staggered in the up and down direction. The rod 31 and the fourth rod 34 are located on the same horizontal plane, the second rod 32 and the third rod 33 are located on the same horizontal plane, and further, the second connecting rod 36 is located on the same horizontal plane as the first rod 31 and the fourth rod 34 to enhance the fit. degree and save space.

In order to further improve the rigidity of the foldable wheelchair when unfolded, in this embodiment, the seat assembly 30 also includes fifth rods 37, sixth rods 38, seventh rods 39 and eighth rods 40 extending in the left and right directions. The rod 37 is located directly below the first rod 31 and has the same length as the first rod 31. The sixth rod 38 is located directly below the second rod 32 and has the same length as the second rod 32. The left end of the fifth rod 37 is The front end of the bottom support rod 11 of the side bracket 10 is rotationally connected, the right end of the fifth rod 37 is rotationally connected to the left end of the sixth rod 38, and the right end of the sixth rod 38 is connected to the bottom support rod 11 of the right side bracket 10. The front end of the front end is rotatably connected; the seventh rod 39 is located directly below the third rod 33 and is the same length as the third rod 33, the eighth rod 40 is located directly below the fourth rod 34 and is the same length as the fourth rod 34, and the seventh rod 39 The left end of the rod 39 is rotationally connected to the rear end of the bottom support rod 11 of the left side bracket 10, the right end of the eighth rod 40 is rotationally connected to the left end of the seventh rod 39, and the right end of the eighth rod 40 is connected to the right The rear ends of the bottom support rods 11 of the side brackets 10 are rotationally connected, so that the fifth rod 37, the sixth rod 38, the seventh rod 39, the eighth rod 40 and the bottom support rods 11 on both sides form a second sixth connecting rod. mechanism; specifically, the fifth rod 37 and the sixth rod 38 are staggered in the up and down direction, the seventh rod 39 and the eighth rod 40 are staggered in the up and down direction, the fifth rod 37 and the eighth rod 40 are located on the same horizontal plane, and the sixth rod 37 and the eighth rod 40 are staggered in the up and down direction. The rod 38 and the seventh rod 39 are located on the same horizontal plane.

Further, the seat assembly 30 also includes a first vertical rod 41, a second vertical rod 42, a third vertical rod 43 and a fourth vertical rod 44. Both ends of the first vertical rod 41 are connected with the first rod 31 and the fifth vertical rod respectively. The rod 37 is connected, the two ends of the second vertical rod 42 are connected to the second rod 32 and the sixth rod 38 respectively, and the two ends of the third vertical rod 43 are connected to the third rod 33 and the seventh rod 39 respectively. , both ends of the fourth vertical rod 44 are connected to the fourth rod 34 and the eighth rod 40 respectively, so that the first six-bar linkage mechanism and the second six-bar linkage mechanism are connected to each other to form a stable support frame; at the same time, the third A vertical pole 41 and a third vertical pole 43 are arranged close to the side bracket 10 on the left side, and a second vertical pole 42 and a fourth vertical pole 44 are arranged close to the side bracket 10 on the right side.

In this embodiment, the locking mechanism includes a locking pin 51 that is pluggably disposed at the right end of the third rod 33. The locking pin 51 is located above the fourth rod 34 and is connected to the locking hole ( (not shown in the figure) correspondingly, when the locking pin 51 is inserted into the locking hole, the locking mechanism is locked, and when the locking pin 51 is disengaged from the locking hole, the locking mechanism is unlocked.

Furthermore, the right end of the third rod 33 is provided with a connecting plate 331 extending horizontally to the right. The locking pin 51 is pluggably inserted through the connecting plate 331. The upper end surface of the locking pin 51 is in contact with the highest point of the third rod 33. flush with each other.

In order to improve the comfort during use, in this embodiment, the upper end of the rear upright pole 13 extends obliquely toward the rear and upward to form a push handle portion 131. The side bracket 10 also includes an armrest bar 15, and the front end of the armrest bar 15 faces forward. It extends downward and is connected to the front end of the seat stay 12 , and the rear end of the armrest bar 15 extends backward and is connected to the middle part of the rear upright 13 .

The above embodiments are only for illustrating the technical concepts and characteristics of the present invention. Their purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly. They cannot thereby limit the scope of protection of the present invention. Equivalent changes or modifications in spirit shall be included in the protection scope of the present invention.

Claims (10)

1. A left and right foldable wheelchair, including two side brackets located on the left and right sides, a wheel assembly connected to the bottom of the side brackets, a seat assembly disposed between the two side brackets, and A locking mechanism for locking the foldable wheelchair in an unfolded state. The side bracket includes a bottom support bar extending in the horizontal direction, a seat support bar arranged parallel to the bottom support bar, and a seat support bar connected to the bottom support bar. rod and the rear end of the seat stay and a rear upright extending in the vertical direction, and a front link connecting the bottom stay and the front end of the seat stay. The wheel assembly includes a The front wheel assembly at the bottom of the front link and the rear wheel assembly connected to the bottom of the rear upright; Its characteristics are: The seat assembly includes a first rod, a second rod, a third rod and a fourth rod extending in the left and right direction, the first rod and the second rod are located on the same vertical plane, and the third rod and the The fourth rod is located on the same vertical plane, the left end of the first rod is rotationally connected to the front end of the seat support of the left side bracket, and the right end of the first rod is connected to the second The left end of the rod is rotatably connected, the right end of the second rod is rotatably connected to the front end of the seat stay of the right side bracket, and the left end of the third rod is rotatably connected to the left end of the side bracket. The rear end of the seat stay is rotatably connected, the right end of the third rod is rotatably connected to the left end of the fourth rod, and the right end of the fourth rod is connected to the side bracket on the right side. The rear end of the seat stay is rotatably connected, so that the first rod, the second rod, the third rod, the fourth rod and the seat stays on both sides form a first six-bar linkage. ; The seat assembly also includes a first link and a second link that cross in an The front end of the second connecting rod is rotatably connected to the middle part of the fourth rod, the front end of the second connecting rod is rotationally connected to the middle part of the second rod, and the rear end of the second connecting rod is rotatably connected to the middle part of the third rod. Turn the connection. 2. The left and right foldable wheelchair according to claim 1, characterized in that: the first rod and the second rod are staggered in the up and down direction, and the third rod and the fourth rod are in the up and down direction. The directions are arranged in staggered directions, the first rod and the fourth rod are located on the same horizontal plane, and the second rod and the third rod are located on the same horizontal plane. 3. The left and right foldable wheelchair according to claim 2, wherein the second link, the first rod and the fourth rod are located on the same horizontal plane. 4. The left and right folding wheelchair according to claim 2, wherein the locking mechanism includes a locking pin pluggably disposed at the right end of the third rod, and the locking pin is located on the third rod. Above the four rods and corresponding to the locking hole provided at the left end of the fourth rod, when the locking pin is inserted into the locking hole, the locking mechanism is locked, and when the locking pin is disengaged from the locking hole , the locking mechanism is unlocked. 5. The left and right foldable wheelchair according to claim 4, characterized in that: the right end of the third rod is provided with a connecting plate extending horizontally to the right, and the locking pin is pluggably inserted through the third rod. On the connecting plate, the upper end surface of the locking pin is flush with the highest point of the third rod. 6. The left and right foldable wheelchair according to claim 1, wherein the seat assembly further includes fifth, sixth, seventh and eighth rods extending in the left and right direction, and the third rod Five rods are located directly below the first rod, and the sixth rod is located directly below the second rod. The left end of the fifth rod is connected with the front end of the bottom support rod of the left side bracket. The right end of the fifth rod is rotationally connected to the left end of the sixth rod, and the right end of the sixth rod is rotationally connected to the front end of the bottom support rod of the right side bracket. ; The seventh rod is located directly below the third rod, the eighth rod is located directly below the fourth rod, and the left end of the seventh rod is connected with the bottom of the left side bracket The rear end of the support rod is rotationally connected, the right end of the eighth rod is rotationally connected to the left end of the seventh rod, and the right end of the eighth rod is connected to the bottom support rod of the side bracket on the right side. The rear end of the rod is rotatably connected, so that the fifth rod, the sixth rod, the seventh rod, the eighth rod and the bottom support rods on both sides form a second six-bar linkage. 7. The left and right foldable wheelchair according to claim 6, characterized in that: the fifth rod and the sixth rod are staggered in the up and down direction, and the seventh rod and the eighth rod are arranged in the up and down direction. The directions are arranged in staggered directions, the fifth rod and the eighth rod are located on the same horizontal plane, and the sixth rod and the seventh rod are located on the same horizontal plane. 8. The left and right foldable wheelchair according to claim 6, wherein the seat assembly further includes a first vertical rod, a second vertical rod, a third vertical rod and a fourth vertical rod, and the first vertical rod The two ends of the vertical rod are connected to the first rod and the fifth rod respectively, and the two ends of the second vertical rod are connected to the second rod and the sixth rod respectively. The two ends of the third vertical rod are connected to the third rod and the seventh rod respectively, and the two ends of the fourth vertical rod are connected to the fourth rod and the eighth rod respectively, The first six-bar linkage mechanism and the second six-bar linkage mechanism are connected to each other to form a stable support frame. 9. The left and right foldable wheelchair according to claim 8, characterized in that: the first vertical rod and the third vertical rod are arranged close to the side bracket on the left side, and the second vertical rod, The fourth vertical rod is disposed close to the side bracket on the right side. 10. The left and right foldable wheelchair according to claim 1, characterized in that: the upper end of the rear pole extends upward and backward to form a push handle portion, and/or the side bracket further includes an armrest. The front end of the armrest bar extends forward and downward and is connected to the front end of the seat support bar, and the rear end of the armrest bar extends backward and is connected to the middle part of the rear upright pole.