TWI726452B - Caster for a wheelchair - Google Patents

Abstract

A caster for a wheelchair includes a sleeve having a sliding channel extending therethrough and an abutment member retractably mounted in the sliding channel, a turning shaft includes a shaft-coupling portion rotatably coupled with the sleeve, a return groove arranged on the outer periphery of the shaft-coupling portion, and a wheel unit having a wheel frame connected to the turning shaft and pivotally coupled with a wheel. The abutment member includes an abutment portion and a telescopic portion opposite to the abutment portion. The return groove aligns with the sliding channel of the sleeve to thereby press the telescopic portion by abutting the abutment portion. The return groove includes first and second ends. The radius from the axis of the shaft-coupling portion to the return groove gradually decreases from each of the first and second ends of the return groove to the intermediate section of the return groove.

Description

Wheelchair auxiliary wheels

The present invention relates to a wheelchair auxiliary wheel, in particular to a wheelchair auxiliary wheel for assisting back-up.

Conventional wheelchairs mainly rely on the user's own force to make the wheelchair turn and move forward. In particular, wheelchair users are usually elderly or patients with poor physical strength. Therefore, it is more expensive to control the wheelchair to return after turning. Physical strength. In view of this, the conventional wheelchair still needs to be improved.

In order to solve the above problems, the purpose of the present invention is to provide a wheelchair auxiliary wheel, which can assist the wheelchair to return to the right position.

The directionality described in the full text of the present invention or its similar terms, such as "front", "rear", "left", "right", "up (top)", "down (bottom)", "inner", "outer" , "Side", etc., mainly refer to the directions of the attached drawings, and the terms of directionality or similar terms are only used to help explain and understand the embodiments of the present invention, and are not used to limit the present invention.

The elements and components described in the full text of the present invention use the quantifiers "one" or "one" for convenience and to provide the general meaning of the scope of the present invention; in the present invention, it should be construed as including one or at least one, and single The concept of also includes the plural, unless it clearly implies other meaning.

Approximate terms such as "combination", "combination" or "assembly" mentioned in the full text of the present invention mainly include the types that can be separated without destroying the components after being connected, or the components cannot be separated after being connected, which are common knowledge in the field Those can be selected based on the materials of the components to be connected or assembly requirements.

The wheelchair auxiliary wheel of the present invention includes: a shaft sleeve with a penetrating sliding path, an abutting member telescopically located on the sliding path, and the abutting member having a relatively abutting portion and a telescopic portion; The steering shaft has a shaft joint rotatably coupled to the shaft sleeve. The circumferential surface of the shaft joint in the radial direction has a guide groove. The guide groove is located on the sliding path of the shaft sleeve. The groove abuts against the abutting part of the abutting piece to compress the telescopic part, the notch of the guiding groove has a first end and a second end opposite to each other, and the axis of the shaft connecting part is connected to the guiding groove The radius of is formed from the first end and the second end respectively decreasing toward the first end and the second end; and a wheel assembly having a wheel frame connected to the steering shaft and pivotally connected to a wheel body.

Accordingly, the wheelchair auxiliary wheel of the present invention can be installed on a wheelchair. The circumferential surface of the shaft connecting portion in the radial direction has the guiding groove, and the shaft center of the shaft connecting portion reaches the center of the guiding groove. The radius is formed from the first end and the second end of the guide groove respectively decreasing toward the center of the guide groove, so that the thrust piece of the sleeve abuts against the first end of the guide groove or The second end time system forms the maximum thrust force, and can generate a moment of sliding toward the center part. When the wheelchair is turned and wants to go straight back, the user can easily drive the wheel with the assistance of the moment. The shaft connecting part rotates to make the pushing member return to the position of pushing against the central part, so that the wheel body of the shaft connecting part returns to the center, achieving the effect of reducing the burden on the user.

Wherein, the sliding path is formed with an opening on the inner peripheral wall of the shaft sleeve, the telescopic part of the abutting member has a support part and an elastic part, and the support part of the telescopic part is fixed to the sliding path relative to the One end of the opening, the two ends of the elastic member of the telescopic part are respectively abutted against the support member and the abutment unit. In this way, the steering shaft can be supported by the elastic restoring force of the elastic member to generate a moment that slides toward the center portion, and it can assist in driving the shaft connection portion to rotate so that the pushing member returns to the pushing member. The effect of reaching the center position.

Wherein, a positioning post is connected between the abutting part and the support, so that the positioning post is reduced in diameter relative to the abutting part, so that the outer peripheral surface of the positioning post is combined with the elastic part of the telescopic part. In this way, the elastic member can be stably compressed and elastically reset on the outer periphery of the positioning column without shaking, and has the effect of improving the smoothness of the abutment member in the sliding path.

Wherein, the outer peripheral wall of the shaft sleeve has a connecting part for connecting to the wheelchair frame, and the sliding path of the shaft sleeve is arranged at the connecting part and penetrates the connecting part and the inner peripheral wall of the shaft sleeve. In this way, other parts of the sleeve can be formed with a thinner wall thickness relative to the connecting part, so as to reduce unnecessary material consumption and have the effect of lightening.

Wherein, a groove bottom of the guiding groove has a center portion, and the axis of the shaft connecting portion forms a minimum radius to the center portion. In this way, the pushing force formed by the first end and the second end against the abutting element can be greater than the pushing force formed by the central portion against the abutting element, and a moment of sliding toward the central portion can be generated , It has the effect of assisting the rotation of the shaft connecting part so that the pushing member can return to the position of pushing against the central part.

Wherein, the central part has a positioning hole. In this way, there is an effect of ensuring that the abutting member can abut against the center portion of the guiding groove.

Wherein, the shaft sleeve has an auxiliary sliding path, the auxiliary sliding path is opposite to the sliding path, and an auxiliary positioning member is telescopically located on the auxiliary sliding path. In this way, the auxiliary positioning member can support the steering shaft, and has the function of positioning the steering shaft.

Wherein, one end of the shaft connection portion opposite to the positioning hole has an auxiliary positioning hole. In this way, there is an effect of ensuring that the abutting member can abut against the center portion of the guiding groove.

Wherein, the radius from the shaft center of the shaft connecting portion to the first end and the second end is equal to The radius from the shaft center of the shaft joint to the outer peripheral surface of the shaft joint. In this way, the guide groove can be formed by the radial difference of the shaft connecting portion, which has the effect of convenient manufacturing.

among them. The wheel frame has a first frame and a second frame that are pivotally connected to each other to form a pivot part. The first frame is connected to the steering shaft, the second frame is connected to the wheel body, and the second frame has a A sliding rail extending from the pivotal portion to the wheel body, a sliding end of a linkage member is slidably coupled to the sliding rail, and the linkage member is pivotally connected to the first sliding end relative to a pivotal end of the sliding end Between the pivotal portion of the bracket and the steering shaft, the wheel frame has an elastic member, and two ends of the elastic member of the wheel frame are respectively connected to the pivotal portion and the sliding end of the linkage member. In this way, it is possible to provide the force that the wheel body always abuts against the ground, and the effect of being attached to the ground.

1: Bushing

1a: first opening

1b: second opening

11: Bearing assembly

11a: inner ring

11b: Outer ring

12: Abut the shoulders

13: Lid

14: slipway

141: Open

15: abutment

15a: Abutment part

15b: Telescopic part

151: Rolling pieces

152: Support

153: Elastic

154: Positioning column

16: Auxiliary slipway

161: open

162: auxiliary positioning parts

162a: Auxiliary abutment part

162b: Auxiliary telescopic part

163: auxiliary rolling element

17: Connection part

171: Lock firmware

2: steering shaft

21: Shaft joint

21a: Shaft tube

21b: Mandrel

21c: Limit ring

21d: gear stop ring

22: guide groove

221: Notch

221a: first end

221b: second end

222: groove bottom

223: Center

224: positioning hole

225: auxiliary positioning hole

3: Wheel assembly

31: Wheel frame

31a: first bracket

31b: second bracket

311: Pivot

312: first connection end

313: second connection end

314: Slide

32: Wheel center

33: Linkage

33a: Sliding end

33b: pivot end

331: Elastic

S: Room

C: Wheelchair frame

[Figure 1] An exploded perspective view of a preferred embodiment of the present invention.

[Figure 2] A side sectional view of a preferred embodiment of the present invention.

[Figure 3] A cross-sectional view along the line A-A in Figure 2.

[Figure 4] A schematic diagram of a preferred embodiment of the present invention installed in a wheelchair.

[Figure 5] A schematic diagram of the abutment member abutting on both ends of the shaft joint when the auxiliary wheel of the wheelchair of the present invention is steered.

[Figure 6] A schematic diagram of the abutting member abutting against the central part of the wheelchair auxiliary cycle timing of the present invention.

In order to make the above and other objectives, features and advantages of the present invention more comprehensible, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings: Please refer to Figures 1 and 2 As shown, it is a preferred embodiment of the wheelchair auxiliary wheel of the present invention, which includes a shaft sleeve 1, a steering shaft 2 and a wheel assembly 3, and the steering shaft 2 is rotatably coupled to The shaft sleeve 1 and the wheel assembly 3 are combined with the steering shaft 2 to rotate with the steering shaft 2.

The sleeve 1 has a first opening 1a and a second opening 1b opposite to each other. The steering shaft 2 can extend through the first opening 1a and the second opening 1b to rotate in the sleeve 1. Details In other words, the shaft sleeve 1 can be combined with the steering shaft 2 by a bearing assembly 11. In this embodiment, the bearing assembly 11 can be a plurality of ball bearings, and the plurality of ball bearings respectively have an inner ring 11a and an inner ring 11a. The outer ring 11b, the inner ring 11a can be combined with the steering shaft 2, the outer ring 11b can be combined with the sleeve 1, for example, the outer ring 11b can be tightly fitted to the inner wall surface of the sleeve 1, or, In this embodiment, the sleeve 1 can form an abutting shoulder 12 facing the first opening 1a with a diameter difference from the inner wall surface, and the outer ring 11b of the bearing assembly 11 can abut the abutting shoulder 12 Therefore, the steering shaft 2 can be rotatably located in the shaft sleeve 1 by the bearing assembly 11. In addition, the first opening 1a can be combined with a cover 13 which can seal the sleeve 1 to prevent foreign matter such as dust from entering.

The sleeve 1 further has a sliding path 14 passing through the sleeve 1. The sliding path 14 is tied to the inner peripheral wall of the sleeve 1 to form an opening 141, and an abutting member 15 is telescopically located on the sliding path 14, so that the abutment member 15 can abut against the steering shaft 2. In detail, the abutment member 15 has an opposite abutment portion 15a and a telescopic portion 15b, and the abutment portion 15a has a rolling The rolling member 151 can roll relative to the abutting member 15, so that when the steering shaft 2 rotates, the rolling member 151 can be driven to roll. For example, the rolling member 151 can be in contact with the abutting member 15 A roller arranged in parallel with the direction of rotation of the steering shaft 2, or, as in this embodiment, the rolling element 151 is a ball that can rotate in any direction, so that the setting direction can be ignored, which has the effect of improving assembly convenience.

The telescopic portion 15b of the abutting member 15 may have a supporting member 152 and an elastic member 153. The supporting member 152 may be fixed to one end of the sliding path 14 opposite to the opening 141, and both ends of the elastic member 153 are Respectively abut against the support 152 and the abutment portion 15a, whereby the abutment The connecting portion 15 a can be pushed by the steering shaft 2 to compress the elastic member 153, and is supported against the steering shaft 2 by the elastic restoring force of the elastic member 153. In this embodiment, a positioning post 154 may be connected between the abutting portion 15a and the supporting member 152. The radial cross-sectional area of the positioning post 154 is smaller than the radial cross-sectional area of the abutting portion 15a, so that the positioning post The diameter of 154 is reduced relative to the abutment portion 15a, so that the outer peripheral surface of the positioning column 154 can be combined with the elastic member 153. In addition, the support member 152 has a chamber S opposite to the positioning column 154, and the abutment When the connecting portion 15a is pushed against, the positioning post 154 can extend through the chamber S, so that the elastic member 153 can be stably compressed and elastically reset on the outer periphery of the positioning post 154 without shaking, and has a lift The abutting member 15 has the effect of the smoothness of expansion and contraction in the sliding path 14.

It is worth noting that the sleeve 1 may also have an auxiliary sliding channel 16, which is opposite to the sliding channel 14, that is, the auxiliary sliding channel 16 is on the inner peripheral wall of the sleeve 1 An opening 161 is formed, and the opening 161 is opposite to the opening 141 of the sliding path 14, and an auxiliary positioning member 162 is telescopically located on the auxiliary sliding path 16, so that the auxiliary positioning member 162 can abut against the The steering shaft 2 is used to position the steering shaft 2. In detail, the auxiliary positioning member 162 has an auxiliary abutting portion 162a and an auxiliary telescoping portion 162b opposite to each other. The auxiliary abutting portion 162a has an auxiliary rolling member 163, and the auxiliary rolling member 163 can be opposed to the auxiliary positioning member 162. By rolling, when the steering shaft 2 rotates, the auxiliary rolling element 163 can be driven to roll. Similarly, the auxiliary rolling element 163 is a ball that can rotate in any direction, so there is no need to consider the installation Direction, has the effect of improving the convenience of assembly. The auxiliary telescopic portion 162b can also be an elastic member, and respectively abut against the auxiliary rolling member 163 and a closed end of the auxiliary sliding way 16, so that the auxiliary abutting portion 162a can be pushed against by the steering shaft 2 The elastic element is compressed, and the steering shaft 2 is supported by the elastic restoring force of the elastic element.

The shaft sleeve 1 may also have a connecting portion 17 which may be located on the outer peripheral wall of the shaft sleeve 1 for connecting the shaft sleeve 1 to a wheelchair frame C via a fastener 171, The sliding channel 14 of the sleeve 1 can be provided at the connecting portion 17 and penetrates the connecting portion 17 and the inner peripheral wall of the sleeve 1, whereby other parts of the sleeve 1 can be formed relative to the connection The thinner wall thickness of the part 17 reduces unnecessary material consumption and has the effect of lightening. However, the sleeve 1 may also have a wall thickness sufficient to provide the sliding path 14 without the sliding path 14 being disposed at the connecting portion 17, which is understood by those skilled in the art, and the present invention will not be repeated here.

The steering shaft 2 has a shaft joint 21, which can be used as a rotation axis, and can be rotatably coupled to the sleeve 1 by the shaft joint 21. In this embodiment, the shaft joint 21 21 can have a shaft tube 21a combined with a mandrel 21b, the outer circumference of the shaft tube 21a can be combined with the inner ring 11a of the bearing assembly 11, preferably the outer circumference of the shaft tube 21a can be combined with a limit ring 21c, the limit ring 21c Abutting against the bearing assembly 11 to prevent the bearing assembly 11 from lifting and shaking, the free end of the core shaft 21b protruding from the shaft tube 21a may have a stop ring 21d to avoid being coupled to the outer circumference of the shaft tube 21a The bearing assembly 11 and the limit ring 21c are protruded from the free end. In addition, the shaft connecting portion 21 can also be an integrally formed shaft rod, which can also be rotatably coupled to the shaft sleeve 1, which is not limited by the present invention .

Please continue to refer to Figures 2 and 3, the circumferential surface of the shaft connecting portion 21 in the radial direction may have a guiding groove 22, and the guiding groove 22 is opposed to the opening 141 on the inner circumferential wall of the sleeve 1 so that The abutting member 15 can abut against the guiding groove 22. In detail, the notch 221 of the guide groove 22 has a first end 221a and a second end 221b opposite to each other. The abutting portion 15a of the abutting member 15 can slide on the steering shaft 2 as the steering shaft 2 rotates. Between the first end 221a and a second end 221b, the guiding groove 22 can compress the elastic member 153 of the abutting member 15 and be pushed by the abutting member 15. The radius from the shaft connecting portion 21 to the guide groove 22 is formed from the first end 221a and the second end 221b toward the first end 221a and the second end 221b, that is, the elastic member The degree of compression 153 from the first end 221a or the second end 221b to the center of the guide groove 22 is different.

In detail, the groove bottom surface 222 of the guide groove 22 has a central portion 223, and the shaft The axis of the connecting portion 21 forms a minimum radius to the central portion 223, whereby the pushing force of the first end 221a and the second end 221b against the abutting member 15 is greater than that of the central portion 223 against the abutting member 15 The pushing force formed by the abutting member 15. In this embodiment, the central portion 223 may have a positioning hole 224, so that when the abutting portion 15a slides to the central portion 223, it can be clamped against the positioning hole 224, thereby ensuring that the abutting member 15 It can abut against the central part 223 of the guide groove 22. Similarly, the shaft connecting portion 21 may have an auxiliary positioning hole 225 at one end relative to the positioning hole 224, and the auxiliary positioning hole 225 may be used for the auxiliary positioning member 162 to be pressed against, so as to further ensure the abutting member 15 can abut against the central part 223 of the guiding groove 22. In addition, the radius from the shaft center of the shaft connecting portion 21 to the first end 221a and the second end 211b may be equal to the radius from the shaft center of the shaft connecting portion 21 to the outer peripheral surface of the shaft connecting portion 21, that is, The groove bottom surface 222 of the guide groove 22 extends to the first end 221a and the second end 221b of the notch 221, whereby the guide groove 22 can be formed by the radial difference of the shaft connecting portion 21, It has the function of manufacturing convenience.

The wheel assembly 3 may be connected to the shaft connection portion 21 of the steering shaft 2 to rotate with the rotation of the shaft connection portion 21. In this embodiment, the wheel assembly 3 may have a wheel frame 31 connected to the steering shaft 2. The wheel frame 31 is pivotally connected to a wheel body 32. The wheel body 32 can be used to abut against the ground to assist the movement of the wheelchair. Therefore, when the wheelchair turns, the wheel body 32 can be steered to drive the steering shaft 2 Rotate relative to the sleeve 1.

In detail, the wheel frame 31 of the wheel assembly 3 may have a first frame 31a and a second frame 31b. The first frame 31a and the second frame 31b are pivotally connected to each other, so that the wheel frame 31 forms a The pivoting portion 311, the end of the first bracket 31a away from the pivoting portion 311 has a first connecting end 312, the first connecting end 312 is connected to the steering shaft 2, and the second bracket 31b is away from the pivoting portion One end of the 311 has a second connecting end 313. The second connecting end 313 is used to be pivotally connected to the wheel body 32, and the pivoting portion 311 is not in axis with the steering shaft 2, and the wheel body 32 is connected to the wheel body 32. The steering shaft 2 is positioned relative to each other in the axial direction, so that the wheel carrier 31 can be in the shape of a U, so that the wheel body 32 can be borrowed The pivot portion 311 of the wheel carrier 31 generates a relative displacement with the steering shaft 2.

In this embodiment, the second bracket 31b may have a sliding rail 314 extending from the pivot portion 311 to the second connecting end 313, and a sliding end 33a of a link 33 is slidably coupled to the A sliding rail 314, a pivotal end 33b of the linkage 33 relative to the sliding end 33a can be pivotally connected between the pivotal portion 311 of the first bracket 31a and the first connection end 312, and the linkage 33 can also There is an elastic member 331. The two ends of the elastic member 331 of the linkage member 33 are respectively connected to the pivot portion 311 and the sliding end 33a of the linkage member 33, whereby the elastic member 331 of the linkage member 33 can be The sliding end 33a of the link 33 is pulled from the second connecting end 313 of the second bracket 31b to the pivoting portion 311, and the second bracket 31b is driven by the pivoting portion 311 with a reaction force. A pivot is generated to displace the wheel body 32 in a direction away from the steering shaft 2, whereby when the wheel body 32 passes through the ground of the recess, the wheel body 32 can descend with the recess, and when When the wheel body 32 passes through the raised ground, the wheel body 32 can rise with the projection. According to this, the wheel body 32 can always abut the ground with the force to fit the ground and follow the ground. The ups and downs have a buffering effect.

Please refer to Figures 4 and 5. According to the aforementioned structure, the wheelchair auxiliary wheel train of the present invention can be installed on the wheelchair frame C. When the wheelchair turns, the wheel body 32 of the wheel assembly 3 turns accordingly, and Drive the shaft connecting portion 21 of the steering shaft 2 to rotate relative to the sleeve 1. At this time, the abutting portion 15a of the abutting member 15 rotates to the left or right according to the steering shaft 2, and is driven by the guide groove 22 The central portion 223 forms a relative sliding movement toward the first end 221a or the second end 221b of the guiding groove 22, because the axis of the steering shaft 2 to the radius of the guiding groove 22 is determined by the central portion 223 respectively Towards the first end 221a and the second end 221b gradually increase, that is, the compressive force of the groove bottom surface 222 of the guide groove 22 against the elastic member 153 of the abutting member 15 also rotates with the shaft connecting portion 21, The central portion 223 gradually increases toward the first end 221a and the second end 221b, respectively.

Please refer to Figure 6, and when the wheelchair turns back to go straight, the shaft connecting portion 21 rotates relative to the sleeve 1, so that the abutting portion 15a of the abutting member 15 is separated from the first end 221a or the second end 221a. The end 221b slides toward the central portion 223. At this time, since the abutting portion 15a of the abutting member 15 abuts against the first end 221a or the second end 221b, it relatively abuts against the central portion 223. A greater thrust force generates a moment of sliding towards the central portion 223, whereby when the abutting portion 15a forms a relative slip towards the central portion 223, the moment can be used to assist the shaft connection portion 21 rotates relative to the sleeve 1 so that the abutting portion 15a returns to the position of abutting the center portion 223 in the guiding groove 22 to assist the wheel body 32 of the wheel assembly 3 to return to the center.

To sum up, the wheelchair auxiliary wheel of the present invention can be installed on a wheelchair, by having the guide groove on the circumferential surface of the shaft connecting portion in the radial direction, and the shaft center of the shaft connecting portion reaches the guide The radius of the groove is formed from the first end and the second end of the guide groove respectively decreasing toward the center of the guide groove, so that the pushing member of the sleeve abuts against the first guide groove At the end or the second end, the maximum thrust is formed, and a moment of slipping toward the center is generated. When the wheelchair is turned and wants to go straight back, the user can easily drive with the assistance of the moment. The shaft connection part rotates to make the pushing member return to the position of pushing against the central part, so that the wheel body of the shaft connection part is returned to the center, achieving the effect of reducing the burden on the user.

Although the present invention has been disclosed using the above-mentioned preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art without departing from the spirit and scope of the present invention may make various changes and modifications relative to the above-mentioned embodiments. The technical scope of the invention is protected. Therefore, the scope of protection of the invention shall be subject to the scope of the attached patent application.

1: Bushing

1a: first opening

1b: second opening

11: Bearing assembly

13: Lid

14: slipway

141: Open

15: abutment

15a: Abutment part

15b: Telescopic part

151: Rolling pieces

152: Support

153: Elastic

154: Positioning column

16: Auxiliary slipway

161: open

162: auxiliary positioning parts

162a: Auxiliary abutment part

162b: Auxiliary telescopic part

17: Connection part

171: Lock firmware

2: steering shaft

21: Shaft joint

21a: Shaft tube

21b: Mandrel

21c: Limit ring

21d: gear stop ring

22: guide groove

221: Notch

221a: first end

221b: second end

222: groove bottom

223: Center

224: positioning hole

225: auxiliary positioning hole

3: Wheel assembly

31: Wheel frame

31a: first bracket

31b: second bracket

311: Pivot

312: first connection end

313: second connection end

314: Slide

32: Wheel center

33: Linkage

33a: Sliding end

33b: pivot end

331: Elastic

C: Wheelchair frame

Claims (10)

A wheelchair auxiliary wheel, comprising: a shaft sleeve with a penetrating sliding path, an abutting piece telescopically located on the sliding path, the abutting piece having a relatively abutting portion and a telescopic portion; a steering shaft , There is a shaft connecting portion rotatably coupled to the shaft sleeve, the circumferential surface of the shaft connecting portion in the radial direction has a guiding groove, the guiding groove is located on the sliding path of the shaft sleeve, and the guiding groove abuts The abutting part connected to the abutting piece to compress the telescopic part, the notch of the guide groove has a first end and a second end opposite to each other, the axis of the shaft connecting part is to the radius of the guide groove , Is formed from the first end and the second end respectively decreasing toward the first end and the second end; and a wheel assembly having a wheel frame connected to the steering shaft and pivotally connected to a wheel body. Such as the wheelchair auxiliary wheel of claim 1, wherein the sliding path is formed on the inner peripheral wall of the sleeve to form an opening, the telescopic part of the abutting part has a support part and an elastic part, and the support part of the telescopic part It is fixed to one end of the sliding path opposite to the opening, and the two ends of the elastic member of the telescopic part abut against the support member and the abutting part respectively. Such as the wheelchair auxiliary wheel of claim 2, wherein a positioning column is connected between the abutting portion and the support, so that the positioning column is reduced in diameter relative to the abutting portion, so that the outer peripheral surface of the positioning column is combined The elastic part of the telescopic part. Such as the wheelchair auxiliary wheel of claim 1, wherein the outer peripheral wall of the sleeve has a connecting portion for connecting to the wheelchair frame, and the sliding path of the sleeve is attached to the connecting portion and passes through the connecting portion and The inner peripheral wall of the sleeve. The wheelchair auxiliary wheel of any one of claims 1 to 4, wherein a groove bottom of the guiding groove has a center portion, and the axis of the shaft connecting portion forms a minimum radius to the center portion. For example, the wheelchair auxiliary wheel of claim 5, wherein the center part has a positioning hole. Such as the wheelchair auxiliary wheel of claim 6, wherein the shaft sleeve has an auxiliary sliding path, The auxiliary sliding path is opposite to the sliding path, and an auxiliary positioning member is telescopically located on the auxiliary sliding path. For example, the wheelchair auxiliary wheel of claim 7, wherein the axle connecting portion has an auxiliary positioning hole at one end relative to the positioning hole. For example, the wheelchair auxiliary wheel of claim 5, wherein the radius of the axis of the axle connecting portion to the first end and the second end is equal to the radius of the axle center of the axle connecting portion to the outer peripheral surface of the axle connecting portion. The wheelchair auxiliary wheel of claim 5, wherein the wheel frame has a first frame and a second frame that are pivotally connected to each other to form a pivoting portion, the first frame is connected to the steering shaft, and the second frame is connected On the wheel body, the second bracket has a sliding rail extending from the pivotal portion to the wheel body, a sliding end of a linkage member is slidably coupled to the sliding rail, and the linkage member is slidable relative to the sliding rail. A pivot end of the end is pivotally connected between the pivot portion of the first bracket and the steering shaft, the wheel frame has an elastic member, and both ends of the elastic member of the wheel frame are respectively connected to the pivot portion and the steering shaft. The sliding end of the linkage.

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