WO2021147615A1

WO2021147615A1 - Anti-tipping wheelchair

Info

Publication number: WO2021147615A1
Application number: PCT/CN2020/139925
Authority: WO
Inventors: 朱吴伟; 谢家陵
Original assignee: 广州视源电子科技股份有限公司
Priority date: 2020-01-21
Filing date: 2020-12-28
Publication date: 2021-07-29
Also published as: CN111249079B; CN111249079A

Abstract

An anti-tipping wheelchair, comprising a front assembly (10) and a rear assembly (20). The front assembly (10) is provided with a front main body (11) and an anti-tipping support (12), the anti-tipping support (12) is rotationally connected to the position, close to the rear assembly (20), of the front main body (11), a reset member (13) is provided between the anti-tipping support (12) and the front main body (11), and the reset member (13) interacts with the anti-tipping support (12) and the front main body (11), respectively; a first clamping part (111) is provided at the end, matching the anti-tipping support (12), of the front assembly (10), a third clamping part (21) is provided on the lower portion of the rear assembly (20), the first clamping part (111) and the third clamping part (21) can match in a locked mode, and the rear assembly (20) interacts with the anti-tipping support (12) and the reset member (13), so that the wheelchair can be prevented from tipping over when inclining.

Description

Anti-tilt wheelchair

This disclosure takes the patent document with the application number 202010070112X and the name "anti-tilt wheelchair" submitted on January 21, 2020 as the priority document, the entire content of which is incorporated into this disclosure by reference.

Technical field

This application relates to the field of transportation tools, especially an anti-tilt wheelchair.

Background technique

As a means of transportation for people with reduced mobility, wheelchairs are very common. They not only enable people with mobility impairments to achieve mobility through wheelchairs, but also increase the possibility of them participating in social activities. When wheelchairs are used normally, they may have uphill behavior and may tilt directly. It is related to the safety of users.

Summary of the invention

The purpose of this application is to improve the shortcomings of the prior art and provide an anti-tilt wheelchair so that when the wheelchair is tilted, it can be prevented from toppling.

The embodiment of the present application provides an anti-tilt wheelchair, including a front assembly and a rear assembly. The front assembly has a front main body and an anti-roll bracket, and the anti-roll bracket is close to the front main body. The rear assembly is rotatably connected, and a reset piece is provided between the anti-tilt bracket and the front body, and the reset piece respectively interacts with the anti-tilt bracket and the front body; One end of the front assembly and the anti-tilt bracket is provided with a first clamping portion, and a third clamping portion is provided at the lower part of the rear assembly. The first clamping portion and the third clamping The connecting part can be locked and matched, and the rear assembly interacts with the restoring piece.

When the anti-tilt wheelchair is in use, the front assembly and the rear assembly are locked and matched, and the first clamping part arranged in the front assembly and the third clamping part arranged in the rear assembly are used for locking The anti-tilt bracket and the front main body are rotatably connected, and a reset piece is arranged between the two. The function of the reset piece is used to connect the anti-tilt bracket and the front main body in a resettable manner. When the front assembly and the rear assembly are locked together, the position of the anti-roll bracket is the original position; when the front assembly and the rear assembly are locked and matched, the position of the anti-roll bracket is Anti-tilt position. When the locking cooperation between the front assembly and the rear assembly is released, the anti-tilt bracket and the front main body are reset to the original position through the action of the reset piece. When the front assembly and the rear assembly are locked and matched, the rear assembly interacts with the reset member, and the reset member drives the anti-tilt bracket to force the anti-tilt bracket to rotate to the anti-tilt position, thereby achieving the anti-tilt effect. Because the anti-roll bracket is supported behind the front body, the wheelchair will not easily tilt backwards, ensuring the safety of the user. For example, when the wheelchair encounters an uphill slope, it is generally easier to tilt backwards. However, the anti-roll wheelchair of this embodiment is supported by the anti-roll bracket behind the front body, so the wheelchair will not easily tilt backwards.

The first clamping portion is provided with a rotating groove, the resetting member includes a rotating block, and the rotating block is rotatably matched in the rotating groove. The rotating block rotates in the rotating groove and is reset by rotating.

The first clamping portion includes a clamping groove, the clamping groove penetrates the wall portion of the rotating groove, the third clamping portion includes a clamping piece, and the outer wall of the rotating block is provided with a lock inwardly Groove, the clamping piece passes through the clamping groove to fit with the locking groove, and when the first clamping portion and the third clamping portion are separated, the rotating block rotates to the The opening of the locking groove is opposite to the engaging groove; when the first engaging portion and the third engaging portion are locked and matched, the rotating block rotates until the opening of the locking groove and the rotating The walls of the groove face each other. Specifically, the clamping piece passes through the clamping groove and enters the rotation groove to contact and cooperate with the rotation block, that is, the first clamping portion is indirectly matched with the third clamping portion through the rotation block. When the rear assembly is clamped into the first clamping part, the opening of the locking groove is opposite to the clamping groove, so when the clamping piece is clamped into the clamping groove, the clamping piece enters the locking groove; When it is necessary to lock and match the rear assembly and the front assembly, rotate the clamping piece. At this time, the clamping piece enters the locking groove and drives the rotating block to rotate together. The rotating block rotates until the opening of the locking groove and The walls of the rotating groove are opposite, so the clamping piece is blocked and cannot be taken out, so the rear part is always formed as a limit. At the same time, due to the rotation of the rotating block, the anti-tilt bracket can be driven to rotate. At this time, the anti-tilt bracket is lifted up and will not interfere with the work of the rear assembly. At the same time, once the tilt occurs, the anti-tilt bracket can act on the ground again. To prevent the wheelchair from tipping over. Therefore, the linkage cooperation method is very clever, and not only realizes the locking and fitting of the rear assembly on the front assembly, but also realizes the position adjustment of the anti-tilt bracket during the locking and fitting.

The entrance of the clamping groove is trumpet-shaped, and the width of the entrance is larger than the width of the clamping joint. The horn-shaped way can play a guiding role for the clamping piece, and it is convenient for the clamping piece to be inserted into the clamping groove.

The rotating groove is a cylindrical groove or a special-shaped groove with at least a part of a cylindrical surface. The rotation groove provided in the splicing position is matched with the rotation of the rotation block, and the rotation groove is at least partially cylindrical, so the rotation center can be kept unchanged when the rotation block rotates, and the stability of the rotation of the rotation block will not be affected.

The outer surface of the rotating block includes at least a partially cylindrical outer surface. When the rotating block is matched with the rotating groove, the cylindrical outer surface of the rotating block is rotationally matched with the rotating groove. This arrangement utilizes the principle of shaft rotation, and the contact rotation of the two arc surfaces is beneficial to the stability of the rotation of the rotating block.

The resetting member further includes a rotating rod and a spring, the rotating block is provided with a protruding portion outwardly, and the protruding portion is provided with a hinge hole, the rotating block is rotatably connected with the front body, and the protruding portion is hinged The hole is rotatably connected with one end of the rotating rod, and the other end of the rotating rod is rotatably connected with the anti-tilt bracket to form a four-link mechanism. One end of the spring is connected to the rotating block, and the other end is connected to the front body. The rotating block, the rotating rod and the anti-roll bracket are connected to form a four-bar linkage mechanism. The position change between the four links is realized by the rotation of the rotating block, thereby realizing the position adjustment of the anti-roll bracket. Pulling, when the rotating block rotates, the spring is forced to accumulate energy, and when the external force is removed, the spring releases the accumulating energy, and the rotating block returns to its original position, thereby driving the anti-tilt bracket to rotate and reset.

A four-bar linkage mechanism is formed between the rotating block, the rotating rod, the anti-roll bracket and the front body, and the rotating block rotates under the action of the clamping piece, so the four-link mechanism is driven to rotate, so that the anti-roll bracket rotates upward; When the connecting piece rotates in the reverse direction, the anti-tilt bracket rotates downward.

The spring is a tension spring, and the rotating block is provided with a perforated lug. One end of the spring is connected with the perforated lug, and the other end is connected with the front body. When separated from the third clamping portion, the length of the spring is the shortest; when the first clamping portion and the third clamping portion are locked and matched, the length of the spring is the longest. When the length of the spring is the shortest, that is, the anti-tilt bracket is in the reset position at this time, that is, the first clamping portion and the third clamping portion are separated. When the length of the spring is the longest, that is, the energy storage of the spring is the maximum. At this time, the first clamping part and the third clamping part are locked and matched, forcing the anti-tilt bracket to lift, and the spring is also accumulating energy at this time. Once the first clamping portion and the third clamping portion are separated, the spring releases the energy storage, so that the anti-tilt bracket and the rotating seat are reset.

When the rotating block and the rotating groove are rotationally matched, the center of rotation is the first center of rotation, the connection between the protrusion and the rotating rod is the second center of rotation, and the connection between the rotating rod and the anti-roll bracket is the first Three rotation centers, the connection between the anti-roll bracket and the rear assembly is the fourth rotation center; the connection between the first rotation center and the second rotation center is the first link, the second rotation center and the third rotation center The connecting rod is the second connecting rod, the connecting rod connecting the third rotation center and the fourth rotating center is the third connecting rod, and the connecting rod connecting the fourth rotating center and the first rotating center is the fourth connecting rod; the first card When the locking and cooperation of the connecting part and the third clamping part are released, the rotating block is rotated to drive the first connecting rod to rotate and approach the fourth connecting rod, the first connecting rod pushes the second connecting rod, and the second connecting rod drives the third connecting rod. The connecting rod is far away from the fourth connecting rod, that is, the anti-roll bracket is controlled to rotate downward; when the first clamping part and the third clamping part are locked and matched, the rotating block is rotated to drive the first connecting rod to rotate away from the first connecting rod. Four connecting rods, the first connecting rod pushes the second connecting rod, and the second connecting rod drives the third connecting rod to approach the fourth connecting rod, that is, to control the anti-roll bracket to rotate upward. The connecting distance between the first rotation center and the third rotation center is the first distance. When the first clamping portion and the third clamping portion are locked and matched, the sum of the lengths of the first connecting rod and the second connecting rod is greater than that of the first connecting rod. At a distance, when the first clamping part and the third clamping part are locked and engaged to release the lock, the first connecting rod approaches the fourth connecting rod, so that the angle between the first connecting rod and the second connecting rod is The angle becomes larger, and the first distance also increases, which forces the third link to rotate away from the fourth link. The third link is the connection between the two hinge holes on the anti-roll bracket, and the fourth link It is nearly parallel to the bearing surface, so when the third link is far away from the fourth link, it is approaching the bearing surface, so the anti-roll bracket is controlled to rotate downward. In the same way, the upward rotation of the anti-tilt bracket is realized when the locking contact of the first clamping part and the third clamping part is switched to the locking cooperation.

When the first clamping portion and the third clamping portion are unlocked, the protruding portion conflicts with the front main body. When the front assembly and the rear assembly are separated, due to the action of the reset piece, the anti-tilt bracket always has a force action. Therefore, the protrusion is used to make the protrusion conflict with the front main body. Prevent the anti-tilt bracket from turning too far.

The anti-roll bracket includes a rotating fitting piece, a support rod, and an anti-roll wheel. The rotating fitting piece and the anti-roll wheel are respectively installed at both ends of the support rod. The rotating fitting piece is connected to the front main body. Rotate the connection at the rear. The anti-roll bracket is connected to the front main body by a rotating fitting, and the support rod can extend the length of the anti-roll bracket, and connect the anti-roll wheel at the other free end, when it is inclined, it can slide through the anti-roll wheel , Aid to reset, can also avoid rigid contact with the ground to damage the anti-tilt bracket.

One end of the rotation fitting piece is welded to the support rod, and the other end is provided with at least two hinge holes, which are respectively rotatably connected with the front main body and the rotation rod. Therefore, the rotating mating member plays a connecting role.

A corresponding second clamping portion and a fourth clamping portion are provided between the front main body and the rear assembly, and the second clamping portion and the fourth clamping portion are matched. The front main body and the rear assembly are first engaged with the first clamping part and the third clamping part, and then the second clamping part and the fourth clamping part are clamped and matched, so that the front assembly and the rear assembly The resulting lock fit is more stable.

The first clamping portion, the second clamping portion, the third clamping portion, the fourth clamping portion and the anti-tilt bracket are all provided with two, and they are arranged symmetrically. After the front assembly and the rear assembly are spliced, the first working wheel and the second working wheel form a four-point support, which has good stability. When the anti-tilt bracket is required to function, it is also bilaterally supported and has good stability.

The front body is provided with a first guide portion, the anti-tilt bracket is provided with a second guide portion, and the first guide portion and the second guide portion are matched. In order to avoid the displacement of the anti-tilt bracket during rotation, the cooperation between the first guide part and the second guide part is adopted.

The first guide part includes a guide plate provided with a guide groove, the guide groove is an arc-shaped groove, and the center of the rotation of the anti-tilt bracket and the front body is the center of the circle, and the second guide part It includes a guide protrusion, the guide protrusion is fixedly installed on the anti-tilt bracket, and the guide groove is matched. The first guide part includes a guide plate, and the second guide part includes a guide protrusion. The guide protrusion cooperates with the arc-shaped groove provided on the guide plate to provide guidance. Since the anti-tilt bracket moves in a rotating manner, the guide groove is set It is an arc-shaped groove, and the center of the circle is the same as the rotation center of the anti-tilt bracket, so it can be guided along the movement track when guiding.

The front assembly further includes first working wheels symmetrically installed on the left and right sides of the lower part, and the rear assembly further includes second working wheels symmetrically installed on the left and right sides of the lower part. After the front assembly and the rear assembly are spliced, the first working wheel and the second working wheel form a four-point support with good stability.

The upper part of the rear assembly is provided with a handle. The handle can easily lift the rear assembly, and the third clamping part needs to overcome the force of the reset part when it is locked into the first clamping part. The handle is located on the upper part of the rear assembly, that is, when the third clamping part rotates When the force is applied by the handle, the moment arm is longer, so it is more labor-saving when rotating, so that labor-saving splicing of the first clamping part and the third clamping part is achieved.

Description of the drawings

Figure 1 is a side view of the front assembly of an embodiment of the present application;

Figure 2 is a schematic diagram of the rear assembly structure of an embodiment of the present application;

Figure 3 is a side view of the front assembly and the rear assembly of the embodiment of the present application when spliced;

4 is a schematic diagram of a three-dimensional structure of an embodiment of the present application;

FIG. 5 is a schematic diagram of a three-dimensional structure of a resetting piece according to an embodiment of the present application;

6 is a schematic diagram of the front body part and the position of the anti-tilt bracket before the front assembly and the rear assembly are locked and matched according to the embodiment of the present application;

FIG. 7 is a schematic view showing the position of the front body part and the anti-roll bracket after the front assembly and the rear assembly of the embodiment of the present application are locked and matched;

8 is a schematic diagram of the positions of the rear assembly, a part of the front main body, and the anti-roll bracket before the front assembly and the rear assembly are locked and cooperated according to the embodiment of the present application;

9 is a schematic diagram of the positions of the rear assembly, a part of the front main body and the anti-roll bracket after the front assembly and the rear assembly of the embodiment of the present application are locked and matched;

10 is a schematic diagram of the front assembly and the rear assembly of the embodiment of the present application before the lock and cooperation, the rear assembly is partially disassembled, and the front body part and the anti-tilt bracket are disassembled;

11 is a schematic diagram of the position of the rear assembly with the second working wheel, the front main body part and the anti-roll bracket after the front assembly and the rear assembly of the embodiment of the present application are locked and matched;

12 is a perspective view of the front assembly and the rear assembly of the embodiment of the present application before the front assembly and the rear assembly are locked and engaged, the rear assembly, the front main body part and the disassembly position of the anti-tilt bracket;

13 is a schematic diagram of the exploded structure of the front main body part, the reset piece and the anti-tilt bracket of the embodiment of the present application;

FIG. 14 is a schematic diagram of a rear assembly structure without a second working wheel according to an embodiment of the present application;

FIG. 15 is a schematic diagram of an enlarged structure at A in FIG. 13 according to an embodiment of the present application.

Description of reference signs:

10. Front assembly; 11. Front body; 111. First clamping part; 1111, clamping groove; 112, second clamping part; 113, rotating groove; 114, first guiding part; 1141, guiding 12, anti-tilt bracket; 121, rotation fitting; 122, support rod; 123, anti-roll wheel; 124, second guide part; 1241, guide protrusion; 13, reset piece; 131, rotating block; 1311, lock Retaining groove; 1312, perforated lug; 1313, protrusion; 132, rotating rod; 133, spring; 101, first working wheel; 20, rear assembly; 21, third clamping part; 211, clamping connection 22, the fourth clamping part; 23, the handle; 201, the second working wheel; 31, the first center of rotation; 32, the second center of rotation; 33, the third center of rotation; 34, the fourth center of rotation.

Detailed ways

The embodiments of the present application will be described in detail below.

The anti-roll wheelchair includes a front assembly 10 and a rear assembly 20. As shown in FIG. 1, the front assembly 10 includes a first working wheel 101, an anti-roll bracket 12, a first clamping portion 111, and a second clamping portion. Part 112, as shown in FIG. 2, the rear assembly 20 includes a second working wheel 201, a third clamping part 21 and a fourth clamping part 22. Before splicing the wheelchair, the front assembly 10 uses the first working wheel 101 and anti-tilt bracket 12 support to prevent tipping. When splicing the wheelchair, the first clamping portion 111 is matched with the third clamping portion 21, and the second clamping portion 112 is matched with the fourth clamping portion 22, as shown in FIG. 3, the rear assembly of the wheelchair after splicing 20 is firmly connected to the front assembly 10, wherein the anti-tilt bracket 12 is lifted up. At this time, the first working wheel 101 and the second working wheel 201 support the entire wheelchair. The front assembly 10 and the rear assembly 20 in Figure 1, Figure 2 and Figure 3 both have a shell.

The front assembly 10 and the rear assembly 20 of the wheelchair are spliced and placed on the receiving surface. The above upper and lower parts indicate that the lower part relative to the receiving surface is the lower part, and the upper part is the upper part; for the same reason, upward and downward All are relative to the receiving surface; locking means that at least two components can move relative to each other to achieve the buckle of the third component.

As shown in FIG. 4, the front assembly 10 has a front body 11 and an anti-tilt bracket 12, and the anti-tilt bracket 12 is rotatably connected with the front body 11 near the rear assembly 20. As shown in Figures 5, 6 and 7, a reset member 13 is provided between the anti-tilt bracket 12 and the front body 11, and the reset member 13 is connected to the anti-tilt bracket 12 and the The front body 11 interacts; a first clamping portion 111 is provided at the mating end of the front assembly 10 and the anti-tilt bracket 12, and a third clamping portion is provided at the lower part of the rear assembly 20 21. The first clamping portion 111 and the third clamping portion 21 can be locked and matched, and the rear assembly 20 interacts with the restoring member 13.

When the anti-tilt wheelchair is in use, as shown in Figure 4, the front assembly 10 and the rear assembly 20 are locked and matched, wherein the first clamping portion 111 provided in the front assembly 10 and the rear The third clamping part 21 of the assembly 20 is locked and fitted, and the anti-tilt bracket 12 and the front main body 11 are rotatably connected, and a resetting member 13 is arranged between the two. The resetting member 13 is used to prevent tilting. The bracket 12 and the front body 11 can be reset and connected. Figures 6 and 8 show the original position of the anti-tilt bracket 12 when the front assembly 10 and the rear assembly 20 are unlocked when the lock cooperation is released; Figures 7 and 9 show the front assembly 10 and When the rear assembly 20 is locked and matched, the position where the anti-tilt bracket 12 is located is the anti-tilt position. When the lock and cooperation of the front assembly 10 and the rear assembly 20 are released, the anti-tilt bracket 12 and the front main body 11 are reset to the original position through the action of the resetting member 13. When the front assembly 10 and the rear assembly 20 are locked and matched, the rear assembly 20 interacts with the restoring member 13, and the restoring member 13 drives the anti-tilt bracket 12 to force the anti-tilt bracket 12 to rotate to the anti-tilt position, thereby achieving Anti-tip function.

In the embodiment, because the anti-roll bracket 12 is supported at the rear of the front body 11, the wheelchair will not easily tilt back and ensure the safety of the user. For example, when the wheelchair encounters an uphill slope, it is generally easier to tilt backwards. However, the anti-roll wheelchair of the present embodiment is supported by the anti-roll bracket 12 behind the front body 11, so the wheelchair will not easily tilt backwards. In this embodiment, the wheelchair may be a stroller.

Here, a second working wheel 201 is installed on the rear assembly 20. When the front assembly 10 and the rear assembly 20 are locked and matched, the anti-roll bracket 12 is used to prevent backward tilting; the front assembly 10 and the rear assembly When the lock and cooperation of the part assembly 20 is released, the rear assembly 20 is removed. Therefore, the support of the second working wheel 201 is easily lost, and the front assembly 10 is likely to tilt and fall, and because the support bracket 12 is at this time In the original position as shown in FIG. 3, the support bracket 12 replaces the position of the second working wheel 201 to support the front assembly 10 to prevent tilting.

Specifically, as shown in Figures 1 and 2, the front assembly 10 further includes first working wheels 101 symmetrically mounted on the left and right sides of the lower part, and the rear assembly 20 also includes two left and right wheels symmetrically mounted on the lower part. Side of the second working wheel 201. After the front assembly 10 and the rear assembly 20 are spliced together, the first working wheel 101 and the second working wheel 201 form a four-point support with good stability.

As shown in FIG. 15, the first clamping portion 111 is provided with a rotating groove 113. As shown in FIGS. 5 and 6, the resetting member 13 includes a rotating block 131, and the rotating block 131 is in the rotating slot 113. Internal rotation fit. The rotating block 131 rotates in the rotating groove and is reset by rotating.

As shown in FIG. 6, the first clamping portion 111 includes a clamping groove 1111, the clamping groove 1111 penetrates the wall of the rotating groove 113, and the third clamping portion 21 includes a clamping piece 211, As shown in Figures 5 and 7, the outer wall of the rotating block 131 is provided with a locking groove 1311 inwardly, and the locking piece 211 passes through the locking groove 1111 to cooperate with the locking groove 1311, as shown in the figure. 6. As shown in FIGS. 8 and 10, when the first clamping portion 111 and the third clamping portion 21 are separated, the rotating block 131 rotates until the opening of the locking groove 1311 is connected to the card The connecting grooves 1111 are opposite; as shown in FIGS. 7 and 9, when the first engaging portion 111 and the third engaging portion 21 are locked and engaged, the rotating block 131 rotates to the locking groove 1311 The opening is opposite to the wall of the rotating groove 113. Specifically, the clamping piece 211 passes through the clamping groove 1111 and enters the rotating groove 113 to contact and cooperate with the rotating block 131, that is, the first clamping portion 111 indirectly cooperates with the third clamping portion 21 through the rotating block 131. Wherein, as shown in FIG. 7, the entrance of the clamping groove 1111 is trumpet-shaped, and the width of the entrance is larger than the width of the clamping joint. By adopting a horn-like manner, the clamping piece 211 can be given a guiding effect, so that the clamping piece 211 can be inserted into the clamping groove 1111 conveniently. When the rear assembly 20 is inserted into the first engaging portion 111, the opening of the locking groove 1311 is opposite to the engaging groove 1111, so when the engaging piece 211 is inserted into the engaging groove 1111, the engaging piece 211 Enter the locking groove 1311; when the rear assembly 20 and the front assembly 10 need to be locked and matched, then the clamping piece 211 is rotated. At this time, the clamping piece 211 enters the locking groove 1311 and drives the rotation The block 131 rotates together, and the rotating block 131 rotates until the opening of the locking groove 1311 is opposite to the wall of the rotating groove 113. Therefore, the clamping piece 211 is blocked and cannot be removed, thus forming a limit for the rear assembly 20. At the same time, due to the rotation of the rotating block 131, the anti-tilt bracket 12 can be driven to rotate. At this time, the anti-tilt bracket 12 is lifted up without interfering with the work of the rear assembly 20. At the same time, once the tilt occurs, the anti-tilt bracket 12 It can also act on the ground to prevent the wheelchair from tipping over. Therefore, the linkage cooperation method is very clever. It not only realizes the locking and fitting of the rear assembly 20 on the front assembly 10, but also realizes the position adjustment of the anti-tilt bracket 12 in the locking and fitting.

In one embodiment, as shown in FIG. 15, the rotating groove 113 is a cylindrical groove or a special-shaped groove with a cylindrical surface at least partially. The rotation groove 113 opened in the splicing position 113 is in rotation with the rotation block 131, and the rotation groove 113 is at least partially cylindrical, so the rotation center of the rotation block 131 can be kept unchanged when the rotation block 131 rotates, and the stability of the rotation block 131 will not be affected. sex. Specifically, in this embodiment, it is a cylindrical groove.

The outer surface of the rotating block 131 includes at least a partially cylindrical outer surface. When the rotating block 131 is matched with the rotating groove 113, the cylindrical outer surface of the rotating block 131 rotates with the rotating groove 113. Cooperate. This arrangement utilizes the principle of shaft rotation, and the contact rotation of the two arc surfaces facilitates the stability of the rotation of the rotating block 131.

As shown in FIG. 5, the reset member 13 further includes a rotating rod 132 and a spring 133. The rotating block 131 is provided with a protrusion 1313 outwardly, and a hinge hole is provided on the protrusion 1313, as shown in FIGS. 6 and 7 As shown, the rotating block 131 is rotatably connected with the front body 11, the hinge hole of the protrusion 1313 is rotatably connected with one end of the rotating rod 132, and the other end of the rotating rod 132 rotates with the anti-roll bracket 12 It is connected to form a four-bar linkage mechanism. One end of the spring 133 is connected to the rotating block 131 and the other end is connected to the front body 11. The rotating block 131, the rotating rod 132 and the anti-roll bracket 12 are connected to form a four-bar linkage mechanism. The position change between the four links is realized by the rotation of the rotating block 131, thereby realizing the position adjustment of the anti-roll bracket 12. The action of 133 pulls the rotating block 131. When the rotating block 131 rotates, the spring 133 is forced to accumulate energy. When the external force is removed, the spring 133 releases the energy, and the rotating block 131 returns to its original position, thereby driving the anti-tilt bracket 12 to rotate and reset , That is, the reset connection of the anti-tilt bracket 12 and the front body 11 is realized.

As shown in FIG. 4, a handle 23 is provided on the upper part of the rear assembly 20. The handle 23 can easily lift the rear assembly 20, and the third clamping portion 21 needs to overcome the force of the resetting member 13 when it is locked into the first clamping portion 111. The handle 23 is located on the upper part of the rear assembly 20, namely When the third clamping portion 21 rotates, force is applied by the handle 23. At this time, the moment arm is longer, so it is more labor-saving during rotation, and the first clamping portion 111 and the third clamping portion 21 are joined with less effort.

As shown in Figure 6, the rotating block 131, the rotating rod 132, the anti-roll bracket 12 and the front body 11 form a four-link mechanism. As shown in Figures 5 and 6, the rotating block 131 acts on the clamping piece 211 Rotation downwards, so the four-bar linkage mechanism is driven to rotate, so that the anti-roll bracket 12 rotates upward; when the clamping piece 211 rotates in the reverse direction, the anti-roll bracket 12 rotates downward.

As shown in FIG. 5, the spring 133 is a tension spring, and the rotating block 131 is provided with a perforated lug 1312. One end of the spring 133 is connected to the perforated lug 1312, and the other end is connected to the front part. The main body 11 is connected, as shown in FIGS. 6 and 7, when the first clamping portion 111 and the third clamping portion 21 are separated, the length of the spring 133 is the shortest; When 111 and the third clamping portion 21 are locked and matched, the length of the spring 133 is the longest. When the length of the spring 133 is the shortest, that is, the anti-tilt bracket 12 is in the reset position at this time, that is, the first clamping portion 111 and the third clamping portion 21 are separated. When the length of the spring 133 is the longest, that is, when the energy storage of the spring 133 is the maximum, the first clamping portion 111 and the third clamping portion 21 are locked and matched to force the anti-roll bracket 12 to lift up. 133 is also accumulating energy. Once the first clamping portion 111 is separated from the third clamping portion 21, the spring 133 releases the stored energy, so that the anti-tilt bracket 12 and the rotating seat are reset.

As shown in Figures 6, 7 and 8, when the rotating block 131 and the rotating groove 113 are rotatably matched, the center of rotation is the first center of rotation 31, and the connection between the protrusion 1313 and the rotating rod 132 is the second The rotation center 32, the connection between the rotation rod 132 and the anti-roll bracket 12 is the third rotation center 33, and the connection between the anti-roll bracket 12 and the rear assembly 20 is the fourth rotation center 34; the first rotation The connection between the center 31 and the second rotation center 32 is the first link, the connection between the second rotation center 32 and the third rotation center 33 is the second link, and the third rotation center 33 and the fourth rotation center 34 are connected The line is the third link, and the connection between the fourth rotation center 34 and the first rotation center 31 is the fourth link; when the first clamping portion 111 and the third clamping portion 21 are unlocked, Rotating the rotating block 131 drives the first connecting rod to turn toward the fourth connecting rod, the first connecting rod pushes the second connecting rod, and the second connecting rod drives the third connecting rod away from the fourth connecting rod, that is, controlling the anti-roll bracket 12 to move closer to the fourth connecting rod. When the first clamping portion 111 and the third clamping portion 21 are locked and matched, the rotating block 131 is rotated to drive the first connecting rod to rotate away from the fourth connecting rod, and the first connecting rod pushes the second The connecting rod, the second connecting rod drives the third connecting rod to approach the fourth connecting rod, that is, the anti-roll bracket 12 is controlled to rotate upward.

The first link, the second link, the third link, and the fourth link mentioned above are virtual rods, which are used to illustrate the rotation state of the four-bar linkage.

The distance between the first rotation center 31 and the third rotation center 33 is the first distance. When the first clamping portion 111 and the third clamping portion 21 are locked and matched, the length of the first connecting rod and the second connecting rod is The sum is greater than the first distance. When the first clamping portion 111 and the third clamping portion 21 are locked and engaged to switch to unlocking, the first connecting rod approaches the fourth connecting rod, so that the first connecting rod and the second connecting rod The angle between the two connecting rods increases, and the first distance increases accordingly, thereby forcing the third connecting rod to rotate away from the fourth connecting rod. The third connecting rod is the two hinge holes on the anti-roll bracket 12 Connecting the line, the fourth link is nearly parallel to the receiving surface, so when the third link is far away from the fourth link, it is approaching the receiving surface, so the anti-roll bracket 12 is controlled to rotate downward. In the same way, the upward rotation of the anti-tilt bracket 12 is realized when the locking contact of the first clamping portion 111 and the third clamping portion 21 is switched to the locking cooperation.

As shown in FIG. 5, when the first clamping portion 111 and the third clamping portion 21 are unlocked, the protruding portion 1313 abuts against the front main body 11. When the front assembly 10 and the rear assembly 20 are separated, due to the action of the reset member 13, there is always a force on the anti-tilt bracket 12, so the protrusion 1313 is used to make the protrusion 1313 and the front The main body 11 conflicts to prevent the anti-tilt bracket 12 from rotating too much.

As shown in Figures 12 and 13, the anti-roll bracket 12 includes a rotating fitting 121, a supporting rod 122, and an anti-roll wheel 123. The rotating fitting 121 and the anti-roll wheel 123 are respectively mounted on the supporting rod. At both ends of 122, the rotating fitting 121 is rotatably connected to the rear of the front body 11. The anti-roll bracket 12 is rotatably connected with the front main body 11 by a rotating fitting 121, and the support rod 122 can extend the length of the anti-roll bracket 12, and is connected to the anti-roll wheel 123 at the other free end. The sliding of the anti-roll wheel 123 assists in resetting, and it can also prevent the rigid contact with the ground from damaging the anti-roll bracket 12.

As shown in FIG. 13, one end of the rotating fitting 121 is welded to the support rod 122, and the other end is provided with at least two hinge holes, which are respectively rotatably connected with the front body 11 and the rotating rod. Therefore, the rotating fitting 121 plays a role of connection.

As shown in Figures 1 and 2, a corresponding second clamping portion 112 and a fourth clamping portion 22 are provided between the front body 11 and the rear assembly 20, and the second card The connecting portion 112 cooperates with the fourth clamping portion 22. The front main body 11 and the rear assembly 20 are first engaged with the first clamping portion 111 and the third clamping portion 21, and then the second clamping portion 112 and the fourth clamping portion 22 are engaged with each other, so that the front The assembly 10 and the rear assembly 20 lock and cooperate more firmly.

As shown in FIG. 4, the first clamping portion 111, the second clamping portion 112, the third clamping portion 21, the fourth clamping portion 22 and the anti-tilt bracket 12 are all provided with two, and they are arranged symmetrically. . After the front assembly 10 and the rear assembly 20 are spliced together, the first working wheel 101 and the second working wheel 201 form a four-point support with good stability. When the anti-tilt bracket 12 is required to function, it is also supported bilaterally, which has good stability.

As shown in Figure 6, the front body 11 is provided with a first guide portion 114, the anti-tilt bracket 12 is provided with a second guide portion 124, the first guide portion 114 and the second guide portion 124 cooperate. In order to avoid the displacement of the anti-tilt bracket 12 when rotating, the cooperation between the first guide portion 114 and the second guide portion 124 is adopted.

As shown in FIG. 7, the first guide portion 114 includes a guide plate provided with a guide groove 1141. The guide groove 1141 is an arc-shaped groove and is rotated by the anti-tilt bracket 12 and the front body 11 The center of is the center of the circle, the second guide portion 124 includes a guide protrusion 1241, the guide protrusion 1241 is fixedly mounted on the anti-tilt bracket 12, and the guide groove 1141 is matched. The first guide portion 114 includes a guide plate, and the second guide portion 124 includes a guide protrusion 1241. The guide protrusion 1241 cooperates with a circular arc groove provided on the guide plate to provide guidance. Since the anti-tilt bracket 12 moves in a rotating manner, Therefore, the guide groove 1141 is set as an arc-shaped groove, and the center of the circle is the same as the rotation center of the anti-tilt bracket 12, so it can be guided along the movement track when guiding.

Not only that, as shown in Figure 7, the two ends of the guide groove 1141 are closed, so the maximum rotation position of the anti-tilt bracket 12 can also be restricted. After the front assembly 10 and the rear assembly 20 are locked and matched, the anti-tilt The guide protrusion 1241 on the bracket 12 is close to the top of the guide groove 1141. If anti-tilting is required, the anti-tilt bracket 12 is forced to continue to rotate upward, so that the guide protrusion 1241 and the top of the guide groove 1141 are in contact with each other. The force point prevents the anti-tilt bracket 12 from rotating too much and being damaged.

As shown in FIG. 11, the rear assembly 20 includes a second working wheel 201. When the first clamping portion 111 and the third clamping portion 21 are locked and engaged, the second working wheel 201 The lowest point of is lower than the lowest point of the anti-tilt bracket 12. At this time, the rear assembly 20 is in a working state, the second working wheel 201 is in contact with the ground, and the lowest point of the anti-roll bracket 12 is higher than the lowest point of the second working wheel 201, so it will not contact the ground.

As shown in FIG. 11, when the first clamping portion 111 and the third clamping portion 21 are locked and engaged, in the horizontal direction, the anti-tilt bracket 12 protrudes a distance from the second working wheel 201 Big. At this time, the coverage area of the anti-tilt bracket 12 is the largest, so the anti-tilt effect is strong and stable.

To use the anti-tilt wheelchair, the anti-tilt bracket 12 and the front body 11 are rotationally connected, and the reset member 13 is arranged between the anti-tilt bracket 12 and the front body 11; when in use, the first card of the front assembly 10 The connecting part 111 and the third clamping part 21 of the rear assembly 20 are locked and matched; the rear assembly 20 interacts with the anti-tilt bracket 12 or the resetting member 13, and the resetting member 13 is forced to accumulate energy, and the anti-rolling bracket 12 Rotate upward around the connection of the front main body 11 as the center of rotation; when disassembling, the first clamping portion 111 of the front assembly 10 and the third clamping portion 21 of the rear assembly 20 are locked and released; The role of the rear assembly 20 with the anti-tilt bracket 12 or the reset member 13 is gradually released, the reset member 13 releases energy storage, and the anti-tilt bracket 12 rotates downward around the connection point of the front main body 11 as the center of rotation.

It should be noted:

The aforementioned "first, second, third..." does not represent a specific number and order, but is only used to distinguish names.

The dotted line in FIG. 13 indicates the connection relationship of the components.

The above are only specific embodiments of this application, and do not limit the scope of protection of this application; any substitutions and improvements made on the basis of not violating the concept of this application belong to the scope of protection of this application.

Industrial applicability

The solutions provided by the embodiments of the present application can be applied to the field of mobility tools. In the embodiments of the present application, the anti-tilt bracket, the first clamping part, the third clamping part, and the anti-roll bracket and the front body are used. The reset piece provided has achieved the technical effect of preventing toppling when the wheelchair is tilted.

Claims

An anti-tilt wheelchair includes a front assembly and a rear assembly. The front assembly has a front main body and an anti-roll bracket, and the anti-roll bracket is rotatably connected with the front main body near the rear assembly, A reset piece is provided between the anti-tilt bracket and the front body, and the reset piece respectively interacts with the anti-tilt bracket and the front body;

A first clamping portion is provided at one end of the front assembly and the anti-tilt bracket, and a third clamping portion is provided at the lower part of the rear assembly. The first clamping portion and the The third clamping part can be locked and matched, and the rear assembly interacts with the restoring member.
The anti-tilt wheelchair according to claim 1, wherein the first clamping portion is provided with a rotating groove, the reset member includes a rotating block, and the rotating block rotates in the rotating slot.
The anti-tilt wheelchair according to claim 2, wherein the first clamping portion includes a clamping groove, the clamping groove penetrates the wall of the rotating groove, and the third clamping portion includes a clamping piece, The outer side wall of the rotating block is provided with a locking groove inwardly, and the locking piece passes through the locking groove to cooperate with the locking groove. When separated, the rotating block rotates until the opening of the locking groove is opposite to the clamping groove; when the first clamping portion and the third clamping portion are locked and engaged, the rotating block Rotate until the opening of the locking groove is opposite to the wall of the rotating groove.
The anti-tilt wheelchair according to claim 3, wherein the entrance of the clamping groove is trumpet-shaped, and the width of the entrance is larger than the width of the clamping joint.
The anti-tilt wheelchair according to claim 3, wherein the rotating groove is a cylindrical groove or a special-shaped groove with at least part of a cylindrical surface.
The anti-tilt wheelchair according to claim 5, wherein the outer surface of the rotating block includes at least a partially cylindrical outer surface, and when the rotating block is matched with the rotating groove, the rotating block has a cylindrical outer surface. The surface is rotatably matched with the rotation groove.
The anti-tilt wheelchair according to claim 2, wherein the restoring member further comprises a rotating rod and a spring, the rotating block is provided with a protruding portion outwardly, and the protruding portion is provided with a hinge hole, and the rotating block is connected to the The front body is rotatably connected, the hinge hole of the protruding part is rotatably connected with one end of the rotation rod, the other end of the rotation rod is rotatably connected with the anti-roll bracket to form a four-bar linkage mechanism, and one end of the spring is connected to the rotation block The other end is connected to the front body.
The anti-tilt wheelchair according to claim 7, wherein the spring is a tension spring, the rotating block is provided with a perforated lug, one end of the spring is connected to the perforated lug, and the other end is connected to the front Part main body is connected, when the first clamping part and the third clamping part are separated, the length of the spring is the shortest; when the first clamping part and the third clamping part are locked and matched When the length of the spring is the longest.
The anti-tilt wheelchair according to claim 7, wherein the rotation center of the rotation block and the rotation groove is the first rotation center, and the connection between the protruding part and the rotation rod is the second rotation center. The connection between the rotation rod and the anti-roll bracket is the third rotation center, and the connection between the anti-roll bracket and the rear assembly is the fourth rotation center; the connection between the first rotation center and the second rotation center is the first rotation center. The connecting rod, the connection between the second rotation center and the third rotation center is the second connecting rod, the connection between the third rotation center and the fourth rotation center is the third connecting rod, and the connection between the fourth rotation center and the first rotation center The line is the fourth link;

When the locking and cooperation of the first clamping portion and the third clamping portion are released, the rotating block is rotated to drive the first connecting rod to rotate and approach the fourth connecting rod, the first connecting rod pushes the second connecting rod, and the second connecting rod pushes the second connecting rod. The connecting rod drives the third connecting rod away from the fourth connecting rod, that is, controlling the anti-roll bracket to rotate downward;

When the first clamping portion and the third clamping portion are locked and matched, the rotating block is rotated to drive the first connecting rod to rotate away from the fourth connecting rod, the first connecting rod pushes the second connecting rod, and the second connecting rod The rod drives the third link to approach the fourth link, that is, to control the anti-roll bracket to rotate upward.
7. The anti-tilt wheelchair according to claim 7, wherein, when the locking of the first engaging portion and the third engaging portion is released, the protruding portion conflicts with the front body.
The anti-roll wheelchair according to any one of claims 1 to 10, wherein the anti-roll bracket includes a rotating fitting piece, a support rod and an anti-roll wheel, and the rotating fitting piece and the anti-roll wheel are respectively mounted on the At both ends of the support rod, the rotation fitting piece is rotatably connected to the rear of the front main body.
The anti-tilt wheelchair according to claim 11, wherein one end of the rotation fitting piece is welded to the support rod, and the other end is provided with at least two hinge holes, which are respectively connected to the front body and the rotation rod in rotation .
The anti-tilt wheelchair according to any one of claims 1 to 10, wherein a corresponding second clamping portion and a fourth clamping portion are provided between the front body and the rear assembly, so The second clamping portion is matched with the fourth clamping portion.
The anti-tilt wheelchair according to claim 13, wherein the first clamping portion, the second clamping portion, the third clamping portion, the fourth clamping portion and the anti-roll bracket are all provided with two, and are relatively symmetrical set up.
The anti-tilt wheelchair according to any one of claims 1 to 10, wherein the front body is provided with a first guide portion, the anti-tilt bracket is provided with a second guide portion, the first guide portion and The second guide part cooperates.
The anti-tilt wheelchair according to claim 15, wherein the first guide portion includes a guide plate provided with a guide groove, the guide groove is an arc-shaped groove, and the anti-tilt bracket is connected to the front main body. The center of rotation is the center of the circle, the second guide portion includes a guide protrusion, the guide protrusion is fixedly mounted on the anti-tilt bracket, and the guide groove is matched.
The anti-tilt wheelchair according to any one of claims 1 to 10, wherein the front assembly further includes first working wheels symmetrically installed on the left and right sides of the lower part, and the rear assembly further includes first working wheels symmetrically installed on the lower part. The second working wheel on the left and right sides.
The anti-tilt wheelchair according to any one of claims 1 to 10, wherein a handle is provided on the upper part of the rear assembly.