CN212281923U

CN212281923U - Wheel chair

Info

Publication number: CN212281923U
Application number: CN202021141539.6U
Authority: CN
Inventors: 李哲; 伍世英
Original assignee: Yangtze University
Current assignee: Yangtze University
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2021-01-05
Anticipated expiration: 2030-06-18

Abstract

The utility model discloses a wheelchair, it includes: a frame; a front wheel rotatably mounted to the frame; a seat mounted on the frame; the rear wheels comprise bases, a plurality of elastic telescopic pieces and limiting pieces, the bases are rotatably fixed on the rack, a plurality of supporting portions extend out of the outer edge of each base, a groove is formed between every two adjacent supporting portions, the elastic telescopic pieces are respectively arranged in the grooves, one end of each elastic telescopic piece is fixed on each base, a pressing surface is formed by the telescopic end of each elastic telescopic piece, and the limiting pieces limit the elastic telescopic pieces to stretch; the output end of the driving piece is connected with the rear wheel, and the driving piece drives the rear wheel to rotate. Front wheel and rear wheel support the frame, and driving piece drive rear wheel is rotatory, makes the wheelchair normally advance, and when the wheelchair scrambleed stair, when supporting the pressure face and supporting the edges and corners of pressing the step, the elastic expansion piece is undercut, makes the recess card in the edges and corners department of step, and then makes the rear wheel have sufficient frictional force when climbing stair.

Description

Wheel chair

Technical Field

The utility model relates to the field of articles for daily use, concretely relates to wheelchair.

Background

With the development of times, China has already stepped into an aging society, and the number of the old people is nearly two hundred million, while the number of the disabled people is more than eighty million. The wheelchair is a huge weak group, and the wheelchair is the most convenient vehicle for the disabled and the old at present. The wheelchair enables the disabled and the old with inconvenient legs and feet to have certain mobility. However, the common wheelchair can only travel on a plane, and the steps of the stairs become obstacles which are difficult to cross in the process of the wheelchair traveling, so that how to make the wheelchair climb the stairs is a technical problem which needs to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the technical insufficiency that the above wheelchair can not climb up the stairs, provides a wheelchair, solves the technical problem that the wheelchair climbs the stairs.

In order to achieve the above technical purpose, the technical solution of the present invention provides a wheelchair, which comprises:

a frame;

a front wheel rotatably mounted to the frame;

a seat mounted to the frame;

the rear wheels comprise bases, a plurality of elastic telescopic pieces and limiting pieces, the bases are rotatably mounted on the rack, a plurality of supporting portions extend out of the outer edge of each base, a groove is formed between every two adjacent supporting portions, the elastic telescopic pieces are correspondingly arranged in the grooves one by one, one end of each elastic telescopic piece is connected to the corresponding base, the other end of each elastic telescopic piece forms a pressing surface, the pressing surfaces can contract towards the bottom ends of the corresponding grooves, when the elastic telescopic pieces are in a natural state, the pressing surfaces and the free ends of the supporting portions are encircled to form a wheel surface, when the elastic telescopic pieces are in a compressed state, the pressing surfaces and the inner edges of the grooves form clamping surfaces, and the limiting pieces are used for limiting the elastic telescopic pieces to stretch;

and the output end of the driving piece is connected with the rear wheel, and the driving piece drives the rear wheel to rotate.

Compared with the prior art, the beneficial effects of the utility model include: the seat loads in the frame, and the user then takes on the seat, and front wheel and rear wheel support the frame, and driving piece drive rear wheel is rotatory to make the wheelchair normally advance, when the wheelchair scrambles stair, support when pressing the face and support the edges and corners of pressing the step, elastic expansion piece is sunken downwards, thereby makes the recess card in the edges and corners department of step, and then makes the rear wheel have sufficient frictional force when climbing stair. Then the driving piece drives the rear wheel to rotate, so that the groove is separated from the step, and the corresponding elastic telescopic piece is reset. And meanwhile, the other elastic expansion piece is contacted with the edge of the next step, and the elastic expansion piece contracts to enable the corresponding groove to be clamped at the edge of the next step. Reciprocating in this way, and enabling the wheelchair to climb up stairs in the continuous rotating process of the rear wheel. When the wheelchair travels on a plane, the limiting piece limits the elastic expansion piece to contract, so that the rear wheel keeps the wheel surface, and the wheelchair can normally travel on the plane.

Drawings

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

FIG. 2 is a schematic diagram of an exploded structure of a rear wheel according to an embodiment of the present invention;

FIG. 3 is a schematic view illustrating an installation of a position limiting member according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a rack according to an embodiment of the present invention;

fig. 5 is an exploded view of a balancing assembly according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of three different embodiments of a guide assembly according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The utility model provides a wheelchair, it includes: the wheelchair comprises a frame 100, a front wheel 200, a seat 300, two rear wheels 400 and a driving part 500, wherein the frame 100 is used for supporting other parts, the front wheel 200 is rotatably fixed at the front part of the frame 100, the seat 300 is loaded on the frame 100, the seat 300 is used for bearing a user, the rear wheels 400 are arranged at the rear part of the frame 100, part of the wheel surfaces of the rear wheels 400 can stretch and retract so as to be beneficial to the wheelchair to climb stairs, the driving part 500 is used for driving the rear wheels 400 to rotate, and a guide assembly 600 is arranged on the frame 100 and plays an auxiliary role when the wheelchair climbs the stairs.

The frame 100 is used to carry other components, and therefore the frame 100 needs sufficient structural strength, while also being made of a lightweight material as possible, thereby reducing the overall weight of the wheelchair.

A front wheel 200 rotatably fixed to the frame 100, the front wheel 200 being intended to cooperate with the rear wheel 400 to support the wheelchair so that the wheelchair can travel in a plane. It should be noted that the front wheels 200 and the rear wheels 400 should support the wheelchair smoothly, and thus the present embodiment preferably employs two front wheels 200 fixed to the front of the frame 100.

The seat 300 is installed on the frame 100, the seat 300 is used for supporting a user, and the arrangement of the seat 300 can be adjusted according to the actual application scenario, and the specific arrangement method of the seat 300 is not described in detail herein.

For the arrangement of the rear wheel 400, the rear wheel 400 is the core of the technical solution, and the present embodiment preferably adopts two rear wheels 400, so that the two rear wheels 400 are fixed at the rear part of the frame 100. The rear wheel 400 includes a base 410, a plurality of auxiliary wheels 420, a plurality of elastic expansion members 430 and a limiting member 440, the base 410 is rotatably fixed to the frame 100, a plurality of supporting portions 411 extend from an outer edge of the base 410, a groove 412 is formed between two adjacent supporting portions 411, the elastic expansion members 430 are respectively disposed in the grooves 412, one end of each elastic expansion member 430 is fixed to the base 410, an abutting surface is formed at an expansion end of each elastic expansion member 430, and the limiting member 440 limits the elastic expansion members 430 to expand and contract.

In the process of climbing stairs by the wheelchair, the pressing surface of the elastic expansion piece 430 presses against the step of the stairs, so that the elastic expansion piece 430 is inwards sunken, the groove 412 is clamped on the step, the rear wheel 400 obtains enough friction force, and the wheelchair climbs the stairs. When the wheelchair is in a plane, the limiting member 440 limits the elastic expansion member 430 to expand and contract, so that the rear wheel 400 maintains a wheel surface state.

When the elastic expansion piece 430 is in a natural state, the plurality of abutting surfaces and the free ends of the plurality of supporting portions 411 enclose a wheel surface, and it should be noted that the wheel surface here should not be interpreted as a narrow circumferential surface, and a continuous rotating profile of the rear wheel 400 is not affected. When the elastic expansion piece 430 is in a compressed state, the abutting surface and the inner edge of the groove 412 form an engaging surface.

Considering the formed engaging surface of the pressing surface and the groove 412, the engaging surface may be locked with the step surface during climbing stairs, thereby affecting the rotation of the rear wheel 400. A plurality of auxiliary wheels 420 rotationally are fixed in a plurality of supporting parts 411 respectively, and the outstanding clamping face of auxiliary wheels 420 outer wheel face, when the clamping face card was on the step, auxiliary wheels 420 supported and pressed in the mesa to rotate as rear wheel 400, utilize auxiliary wheels 420's guide effect, can assist the clamping face and break away from the step, thereby be favorable to rear wheel 400 to scramble stair.

For the specific design of the elastic telescopic member 430, the following mode is preferably adopted in this embodiment, the elastic telescopic member 430 includes a guide rod 431, a spring 432 and a pressing block 433, the guide rod 431 is fixed to the groove 412, a pressing surface is formed at one end of the pressing block 433, a guide hole 433a is formed at one end of the pressing block 433, the guide rod 431 is sleeved with the guide hole 433a, the spring 432 is disposed inside the guide hole 433a, one end of the spring 432 is connected to the bottom end of the guide hole 433a, and the other end of the spring 432 is connected to the groove 412. In order to facilitate the rotation of the rear wheel 400, the pressing surface should be configured as a circular arc surface.

The limiting member 440 is a plurality of limiting locks 441, the pressing block 433 is provided with a lock groove 433b, the limiting locks 441 are fixed on the base 410, in order to adjust the installation position of the limiting locks 441, the base 410 extends out of a plurality of lock holders 413, and then the limiting locks 441 are fixed on the lock holders 413.

The output end of the limiting lock 411 is opposite to the lock groove 433b, and the elastic expansion piece 430 can be limited to expand and contract when the output end of the limiting lock 411 is inserted into the lock groove 433 b.

In the present embodiment, the position-limiting lock 441 is preferably an electromagnetic lock, and the electromagnetic lock is LY-032. It should be noted that the electromagnetic lock is only a preferred embodiment of the position limiter 440, and that a mechanical spring lock may be equally satisfactory. In addition, the limit lock 441 without the bolt can also meet the requirement, for example, the elastic expansion piece 430 is limited to expand and contract by magnetic force, the side surface of the pressing block 433 is pressed by a rubber pad, and the expansion and contraction of the elastic expansion piece 430 are limited by friction damping, similar to a bicycle brake.

When the pressing block 433 presses the edge of the step, the pressing block 433 slides along the guide rod 431, and when the pressing block 433 leaves the edge of the step, the pressing block 433 is reset under the action of the spring 432.

On the basis of the above scheme, in order to avoid the pressing block 433 from rotating along the guide rods 431, it is preferable to simultaneously fix two guide rods 431 in the same groove 412, and two guide holes 433a are formed in one end of the pressing block 433 away from the pressing surface, and the two guide holes 433a are respectively sleeved on the two guide rods 431.

The driving member 500 has an output end connected to the rear wheel 400, and the driving member 500 drives the rear wheel 400 to rotate. The driving member 500 of the present embodiment preferably employs a dc brush motor, which is a rotating electrical machine having a brush device therein to convert dc electrical energy into mechanical energy or mechanical energy into dc electrical energy. In contrast to dc brushless motors, brush devices are used to draw in or out dc voltages and dc currents. The DC brush motor is the basis of all motors, and has the characteristics of quick start, timely braking, capability of smoothly regulating the speed in a large range, relatively simple control circuit and the like.

In the process of climbing stairs of the wheelchair, the wheelchair needs to obtain an elevation angle, but if the radius of the front wheel 200 is smaller than the height of the step, the radius of the front wheel 200 cannot play a role in guiding, so that the front wheel 200 climbs the step, but if the radius of the front wheel 200 is designed to be too large, the radius of the front wheel is larger than the height of the step, so that the guiding effect can be correctly played, the center of gravity of the wheelchair can be inclined backwards, and the possibility that the wheelchair tilts backwards and topples can be increased.

In order to solve the problem, a guide assembly 600 is further added, the guide assembly 600 includes a base 610 and a plurality of guide wheels 620, the plurality of bases 610 are rotatably fixed to the frame 100, the base 610 extends outwards to form a plurality of connecting ribs 611, and the plurality of guide wheels 620 are respectively rotatably fixed to free ends of the plurality of connecting ribs 611.

In the process of climbing stairs by the wheelchair, two adjacent guide wheels 620 respectively abut against the plane and the vertical plane of the step, and meanwhile, the base 610 can rotate, so that the guiding function can be played when the wheelchair climbs the stairs. Meanwhile, the backward inclination range of the gravity center of the wheelchair is reduced, and the stability of climbing stairs by the wheelchair is improved.

In this embodiment, three connecting ribs 611 with the same length are preferably uniformly arranged around the base 610, and it is obvious that, as shown in fig. 5, the length of each connecting rib 611A is slightly different, the guiding assembly 600 can still perform the guiding function, the included angle between the same connecting ribs 611B is slightly different, the number of the connecting ribs 611C can also be increased appropriately, and the guiding assembly 600 can also perform the guiding function normally. Specifically, at any time, a guide wheel 620 may be pressed against the step surface.

Consider that the wheelchair is climbing stair's in-process, seat 300 can be faced back, can influence user's comfort on the one hand, and on the other hand user also can make the holistic focus of wheelchair face back along with seat 300 is faced back, influences the stability of the climbing stair of wheelchair.

Therefore, the housing 100 includes a housing body 110 and a balance assembly 120, the balance assembly 120 includes an inner rotating member 121 and an outer rotating member 122, the inner rotating member 121 is rotatably fixed to the housing body 110, the outer rotating member 122 is rotatably fixed to the inner rotating member 121, the base 610 is rotatably fixed to the inner rotating member 121, and the base 610 is rotatably fixed to the outer rotating member 122. With the frame 100 designed by the above scheme, during the process of climbing stairs of the wheelchair, the rear wheel 400 rotates along with the outer rotating member 122, the guide assembly 600 rotates along with the inner rotating member 121, and the rotation of the inner rotating member 121 and the outer rotating member 122 does not affect the frame body 110, so that the seat 300 is kept stable.

In order to explain the operation principle of the balance assembly 120 more clearly, the inner rotating member 121 includes an inner guide groove 121a, an inner rotating rod 121b and an inner sliding block 121c, the inner guide groove 121a is arc-shaped and fixed to the rack body 110, the middle portion of the inner rotating rod 121b is hinged to the rack body 110, the inner sliding block 121c is slidably disposed in the inner guide groove 121a, a hinge point of the inner rotating rod 121b and the rack body 110 is located at the center of the guide groove 121a, one end of the inner rotating rod 121b is hinged to the inner sliding block 121c, and the base portion 610 is rotatably fixed to the other end of the inner rotating rod 121 b. When the wheelchair climbs stairs, the guide assembly 600 drives the inner rotating rod 121b to rotate along the inner guide groove 121 a.

The outer rotating member 122 includes an outer guide slot 122a, an outer rotating rod 122b and an outer sliding block 122c, the outer guide slot 122a is arc-shaped, the outer guide slot 122a is fixed on the inner guide slot 121a, the center of the outer guide slot 122a is the same as the center of the inner guide slot 121a, the outer sliding block 122c is slidably disposed on the inner guide slot 121a, the middle portion of the outer rotating rod 122b is hinged to the inner rotating rod 121b, the hinge point of the outer rotating rod 122b and the inner rotating rod 121b is located at the center of the outer guide slot 122a, one end of the outer rotating rod 122b is hinged to the outer sliding block 122c, and the base 610 is rotatably fixed at the other end of. When the wheelchair climbs stairs, the rear wheel 400 drives the outer rotating rod 122b to rotate along the inner guide groove 122 a.

In order to avoid the excessive rotation of the inner and outer

rotating members

121 and 122 during the climbing of the stairs. The inner rotating member 121 further includes an inner telescopic rod 121d, the outer rotating member 122 further includes an outer telescopic rod 122d, one end of the inner telescopic rod 121d is hinged to the inner guide groove 121a, the other end of the inner telescopic rod 121d is hinged to the inner rotating rod 121b, one end of the outer telescopic rod 122d is hinged to the outer guide groove 122a, and the other end of the outer telescopic rod 122d is hinged to the outer rotating rod 122 b. By utilizing the pulling action of the inner telescopic rod 121d and the outer telescopic rod 122d, the inner telescopic rod 121d and the outer telescopic rod 122d play a role in buffering in the rotating process of the inner rotating member 121 and the outer rotating member 122, so that the wheelchair can climb more stably.

The seat 300 is loaded on the frame 100, the user sits on the seat 300, the front wheel 200 and the rear wheel 400 support the frame 100, the driving piece 500 drives the rear wheel 400 to rotate, so that the wheelchair can normally advance, when the wheelchair climbs stairs, the pressing surface presses the edges of the steps, the elastic telescopic piece 430 is downwards sunken, so that the groove 412 is clamped at the edges of the steps, and the rear wheel has enough friction force when climbing the stairs. The driving member 500 drives the rear wheel 400 to rotate, and the groove 412 is separated from the step by the guiding action of the auxiliary wheel 420, so that the corresponding elastic expansion member 430 is reset. Meanwhile, another elastic expansion piece 430 is contacted with the corner of the next step, and the elastic expansion piece 430 contracts, so that the corresponding groove 412 is clamped at the corner of the next step. Reciprocating in this way, and enabling the wheelchair to climb up stairs in the continuous rotating process of the rear wheel.

Claims

1. A wheelchair, comprising:

a frame;

a front wheel rotatably mounted to the frame;

a seat mounted to the frame;

2. The wheelchair of claim 1 wherein said rear wheel further comprises a plurality of auxiliary wheels rotatably secured to said plurality of support portions, respectively, and wherein said auxiliary wheel outer surface protrudes from said engagement surface.

3. The wheelchair of claim 1, wherein the elastic expansion member comprises a guide rod, a spring and a pressing block, the guide rod is fixed to the groove, one end of the pressing block forms a pressing surface, one end of the pressing block, which is far away from the pressing surface, is provided with a guide hole, the guide hole is sleeved on the guide rod, the spring is arranged inside the guide hole, one end of the spring is connected with the bottom end of the guide hole, and the other end of the spring is connected with the groove.

4. The wheelchair of claim 3, wherein the two guide rods are fixed to the grooves, two guide holes are formed in one end of the pressing block, which is away from the pressing surface, and the two guide holes are respectively sleeved on the two guide rods.

5. The wheelchair of claim 1, wherein the limiting member comprises a plurality of limiting locks, the elastic extensible member has a locking slot at its extensible end, the limiting locks are fixed to the supporting members, and the output ends of the limiting locks face the locking slot.

6. The wheelchair of claim 1 further comprising a guide assembly including a base rotatably secured to the frame and having a plurality of links extending outwardly therefrom, and a plurality of guide wheels rotatably secured to free ends of the plurality of links, respectively.

7. The wheelchair of claim 6 wherein the frame includes a frame body and a counterbalance assembly, the counterbalance assembly including an inner rotatable member rotatably secured to the frame body and an outer rotatable member rotatably secured to the inner rotatable member, the base rotatably secured to the inner rotatable member, and the base rotatably secured to the outer rotatable member.

8. The wheelchair of claim 7, wherein the inner rotating member comprises an inner guide groove, an inner rotating rod and an inner sliding block, the inner guide groove is arc-shaped and fixed on the frame body, the middle part of the inner rotating rod is hinged to the frame body, the inner sliding block is slidably arranged in the inner guide groove, a hinged point of the inner rotating rod and the frame body is located at the center of the guide groove, one end of the inner rotating rod is hinged to the inner sliding block, and the base part is rotatably fixed at the other end of the inner rotating rod.

9. The wheelchair of claim 8, wherein the outer rotating member comprises an outer guide slot, an outer rotating rod and an outer sliding block, the outer guide slot is arc-shaped, the outer guide slot is fixed in the inner guide slot, the center of the outer guide slot is the same as that of the inner guide slot, the outer sliding block is slidably arranged in the inner guide slot, the middle of the outer rotating rod is hinged to the inner rotating rod, the hinged point of the outer rotating rod and the inner rotating rod is located at the center of the outer guide slot, one end of the outer rotating rod is hinged to the outer sliding block, and the base is rotatably fixed at the other end of the outer rotating rod.

10. The wheelchair of claim 9 wherein said inner rotatable member further comprises an inner telescoping bar and said outer rotatable member further comprises an outer telescoping bar, said inner telescoping bar being hingedly connected at one end to said inner channel and at the other end to said inner rotatable bar, said outer telescoping bar being hingedly connected at one end to said outer channel and at the other end to said outer rotatable bar.