Counter-brace structure

Abstract

A counter support rod structure is suitable for being arranged on a wheelchair and includes a control mechanism and a counter support rod mechanism. The control mechanism includes a mounting body arranged on the wheelchair and defining a mounting space, and a positioning unit arranged in the mounting space and capable of being elastically reset and having a first positioning portion. The counter support rod mechanism includes a counter support rod unit movably inserted into the mounting body and having a second positioning portion, and an elastic member providing an elastic force for upward movement of the counter support rod unit. The positioning unit is movable between a locking position and a working position. In the locking position, the first positioning portion is clamped to the second positioning portion, and the counter support rod unit cannot move and is adjacent to the ground. In the working position, the first positioning portion is separated from the second positioning portion, and the counter support rod unit is upwardly moved by the elastic force and away from the ground. The present application can conveniently move the counter support rod, improve the flexibility of using the wheelchair, and also consider safety.

Description

Technical Field

[0001] This invention relates to a strut, and more particularly to a movable anti-strut structure for wheelchairs. Background Technology

[0002] See Figure 1 A typical wheelchair 9 includes a seat body 91 and at least one counter-bracing rod 92. The seat body 91 mainly includes a frame 911, and two front wheels 912 and two rear wheels 913 respectively disposed on the front and rear sides of the frame 911. The counter-bracing rod 92 extends integrally from the rear side of the lower frame 911 of the seat body 91, bends, and then extends downwards. It can support the wheelchair 9 to prevent it from tipping over when the wheelchair 9 is unstable and tilts backwards, thus avoiding the accidental fall of the occupant (not shown in the figure) and increasing the safety of the user when using the wheelchair 9.

[0003] However, since the counter-steering bar 92 is integrally molded and fixed to the seat body 91, when the wheelchair 9 needs to move from a lower road to a higher sidewalk, the counter-steering bar 92 gets stuck because it prematurely hits the road surface when the front wheels 912 are lifted, preventing the wheelchair 9 from tilting backward at a large angle using the rear wheels 913 as a support point. Therefore, the current wheelchair 9 still has room for improvement. Summary of the Invention

[0004] The purpose of this invention is to provide a counter-strut structure that can at least overcome the shortcomings of the prior art.

[0005] The anti-strut structure of the present invention is suitable for installation in a wheelchair and includes a control mechanism and an anti-strut mechanism.

[0006] The control mechanism includes a mounting body suitable for installation on the rear side of the wheelchair and extending along a first direction to define an installation space, and a positioning unit located in the installation space and capable of elastic reset, the positioning unit having a first positioning part.

[0007] The anti-bracing mechanism includes an anti-bracing unit that is movably inserted into the mounting body along a second direction intersecting the first direction, and an elastic member connected to the anti-bracing unit and providing an elastic force to move the anti-bracing unit in the opposite direction to the ground. The anti-bracing unit has a second positioning part.

[0008] The positioning unit can move relative to the mounting body between a locked position and a movable position. In the locked position, the first positioning part of the positioning unit engages with the second positioning part of the counter-bracing unit, preventing the counter-bracing unit from moving along the second direction, and the counter-bracing unit is close to the ground. In the movable position, the first positioning part disengages from the second positioning part, causing the counter-bracing unit to move away from the ground along the second direction under the elastic force of the elastic member.

[0009] The anti-bracing structure of the present invention further includes a control component mounted on the mounting body. The control component can be operated to move along the first direction to push the positioning unit to move in the first direction.

[0010] The anti-bracing structure of the present invention has a control member of the control mechanism having a pressing part located outside the mounting body and at least one pushing part connected to the pressing part and located in the mounting space of the mounting body, the at least one pushing part abutting against the positioning unit.

[0011] The anti-bracing structure of the present invention includes a positioning unit comprising a positioning member that is movable relative to the mounting body along the first direction in the mounting space, a fixing piece that is fixedly disposed in the mounting space and spaced apart from the positioning member, and an elastic member that supports the positioning member and the fixing piece. The positioning member has the first positioning portion, and the elastic member has an elastic force that constantly pushes the positioning member toward the anti-bracing unit.

[0012] The anti-bracing structure of the present invention includes a control member having two spaced-apart pushing portions, a positioning member located between the control member and the elastic member, and including a supporting portion that abuts against the elastic member, and a first positioning portion that extends from the supporting portion to the anti-bracing unit and can be engaged with the second positioning portion.

[0013] In the anti-bracing structure of the present invention, the second positioning part is a locking hole into which the first positioning part can extend.

[0014] The reverse strut structure of the present invention includes a reverse strut unit that is movably inserted into the mounting body along the second direction, and a cover fixedly disposed on the top side of the reverse strut. The reverse strut extends downward and backward in the second direction, and the elastic member is sleeved on the reverse strut and abuts against the mounting body and the cover.

[0015] The reverse strut structure of the present invention includes a mounting body having a mounting base tube extending along the first direction and defining the mounting space, and an intermediate sleeve fixedly connected to the outer peripheral surface of the mounting base tube and extending along the second direction. The reverse strut is movably inserted through the mounting base tube and the intermediate sleeve, and is radially spaced from the intermediate sleeve to define a telescopic space for the elastic member. The cover has a cover portion connected to the top side of the reverse strut, and a surrounding portion extending from the outer peripheral edge of the cover portion along the second direction and movably fitted onto the intermediate sleeve along the second direction.

[0016] The anti-bracing rod structure of the present invention further includes a rod portion that can be movably inserted into the mounting body, a connecting portion located below the mounting body and fixedly connected to the bottom side of the rod portion, and an anti-bracing portion connected to the bottom end of the connecting portion and used to support against the ground. In the active position, the connecting portion abuts against the bottom side of the mounting base tube to limit the anti-bracing rod from moving upward.

[0017] The anti-bracing structure of the present invention has a control member having two pushing portions respectively connected to the pressing portion, the anti-bracing unit extending in the second direction and located between the pushing portions at intervals.

[0018] The anti-strut structure of the present invention includes a mounting body having a through groove, a positioning unit including a positioning member pivotally mounted in the mounting space and a reset elastic member connected between the mounting body and the positioning member, and a control mechanism including a control member connected to the top side of the positioning member and protruding out of the through groove for pressing, and a bracing member installed in the mounting space and extending toward the anti-strut mechanism and spaced apart from the positioning member.

[0019] The anti-bracing structure of the present invention includes a positioning member having a first positioning portion located on the front side and facing the anti-bracing mechanism, and a sleeve portion located on the rear side. A reset elastic member is sleeved on the sleeve portion and provides an elastic force that drives the sleeve portion to move toward the through slot.

[0020] The anti-bracing structure of the present invention includes an anti-bracing rod extending along the second direction and being hollow, having the second positioning portion, and an installation member disposed in the anti-bracing rod and extending along the second direction. The elastic member is installed in the anti-bracing rod, sleeved on the installation member, and located between the installation member and the abutment member.

[0021] The anti-bracing structure of the present invention further includes a first slot extending along the second direction into which the abutment protrudes, and a second slot extending vertically along the second direction into which the abutment can also pass.

[0022] The beneficial effects of the present invention are as follows: by utilizing the design of the positioning unit and the anti-bracing rod mechanism, the anti-bracing rod can be easily moved upward to the active position, improving the flexibility of wheelchair movement, while also ensuring safety when the position is locked. Attached Figure Description

[0023] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, wherein:

[0024] Figure 1 This is a side view, illustrating that the wheelchair is currently equipped with a counter-bracing bar;

[0025] Figure 2 This is a perspective view illustrating a first embodiment of the anti-strut structure of the present invention, applicable to wheelchairs;

[0026] Figure 3 This is a perspective view illustrating the first embodiment of the anti-strut structure;

[0027] Figure 4 This is an exploded three-dimensional view illustrating the first embodiment of the anti-strut structure;

[0028] Figure 5 This is a sectional view illustrating that the anti-strut unit of the first embodiment of the anti-strut structure is in the locked position;

[0029] Figure 6 It is similar Figure 5 The view shows the anti-strut unit in the active position;

[0030] Figure 7 This is a perspective view illustrating a second embodiment of the anti-strut structure of the present invention;

[0031] Figure 8 This is an exploded perspective view illustrating a second embodiment of the anti-bracing structure, with the anti-bracing portion omitted;

[0032] Figure 9 This is a sectional view illustrating that the anti-strut unit of the second embodiment of the anti-strut structure is in the locked position;

[0033] Figure 10 It is similar Figure 9 The view shows the anti-strut unit in the active position. Detailed Implementation

[0034] See Figure 2 and Figure 3The first embodiment of the anti-stretcher structure 10 of the present invention is suitable for installation on a wheelchair 81. The wheelchair 81 includes a seat body 82, and two front wheels 83 and two rear wheels 84 respectively disposed on the front and rear sides of the seat body 82. The seat body 82 includes multiple frames 86 located on the underside of the seat body 82 and extending forward and backward. In this embodiment, two anti-stretcher structures 10 are installed on the wheelchair 81 and respectively mounted on the rear ends of the frames 86. Since the anti-stretcher structures 10 are identical, only one anti-stretcher structure 10 will be described below.

[0035] In this embodiment, the wheelchair 81 is a general wheelchair. In other variations, it can also be an electric wheelchair, as long as the rear bottom of the wheelchair 81 has an area for the installation of the anti-bracing structure 10, and the anti-bracing structure 10 can also be one.

[0036] See Figures 3 to 5 The anti-bracing structure 10 includes a control mechanism 1 and an anti-bracing mechanism 2. The control mechanism 1 includes a mounting body 11 fixedly inserted into the rear end of the frame 86 by a set of screws 31 and nuts 32, a positioning unit 12, and a control component 13.

[0037] The mounting body 11 has a cylindrical mounting base tube 111 that extends back and forth along a first direction T1 (i.e., the front-to-back direction) to define a mounting space 112, and an intermediate sleeve 113 that is fixedly connected to the top side of the outer peripheral surface of the mounting base tube 111 and communicates with the mounting base tube 111. The intermediate sleeve 113 is also cylindrical and extends along a second direction T2 that is at an angle to the first direction T1, and has an upward-facing abutment surface 114 located on its inner peripheral surface.

[0038] The positioning unit 12 is located in the mounting space 112 and can be elastically reset. It includes a positioning member 121 located in the mounting space 112 and movable relative to the mounting base tube 111 along the first direction T1; a fixing piece 122, which is circular and adhered to the mounting base tube 111, located in the mounting space 112, and spaced apart in front of the positioning member 121; and an elastic member 123 supporting the positioning member 121 and the fixing piece 122. The positioning member 121 includes a cylindrical abutment 124 extending along the first direction T1 and supporting the elastic member 123, and a first positioning portion 125 protruding rearward from the abutment 124 and gradually narrowing in width. The elastic member 123 is a compression spring with a constant elastic force that pushes the positioning member 121 rearward. The frame 86 passes through the mounting base tube 111 and communicates with the mounting space 112 in the first direction T1. In other embodiments, the fixing piece 122 of the positioning unit 12 and the elastic member 123 can also be disposed in the frame 86 that passes through the mounting base tube 111 and communicates with the mounting space 112, as long as the elastic member 123 is located between the positioning member 121 and the fixing piece 122 and can provide the positioning member 121 with elastic force in the opposite direction to the fixing piece 122.

[0039] In this embodiment, the supporting portion 124 also has a first movable limiting hole 126 extending along the first direction T1 and penetrating in a lateral direction (i.e., perpendicular to the first direction T1). A set of screws 33 and nuts 34, passing through the first movable limiting hole 126 and fixed to the mounting base tube 111, allow the positioning member 121 to move relative to the screws 33 within the mounting base tube 111 along the first direction T1. The distance the positioning member 121 can move is equal to the length of the first movable limiting hole 126. In other embodiments, the positioning member 121 may also have a limiting structure (not shown), such as a groove or flange, and the mounting base tube 111 may also have a corresponding mating structure (not shown), such as a protrusion corresponding to the groove or a groove corresponding to the flange, allowing the positioning member 121 to move within the mounting base tube 111 along the first direction T1.

[0040] The control element 13 is located behind the positioning element 121 and is movable in the first direction T1. It includes a flat pressing portion 131 located behind the mounting base tube 111, a limiting portion 132 extending forward from the pressing portion 131 and into the mounting space 112, and two pushing portions 133 spaced apart from each other and extending forward from the front end of the limiting portion 132 into the mounting space 112. The limiting portion 132 has a second moving limiting hole 134 that extends vertically (i.e., perpendicular to the first direction T1 and laterally) and along the first direction T1. A set of screws 35 and nuts 36, passing through the second moving limiting hole 134 and fixed to the mounting base tube 111, allows the control element 13 to move relative to the screws 35 within the mounting base tube 111 along the first direction T1. The distance the control element 13 can move is equal to the length of the second moving limiting hole 134. The pushing part 133 is elongated and abuts against the rear periphery of the supporting part 124 of the positioning member 121. Therefore, when the control member 13 is forced to move forward, it can push the positioning member 121 forward. In this embodiment, the control member 13 moves forward to push the positioning member 121 forward. However, in actual implementation, the control member 13 can also be a steel cable directly connected between the positioning member 121 and the seat body 82 of the wheelchair 81, used to pull the positioning member 121 forward.

[0041] The anti-stretcher mechanism 2 includes an anti-stretcher unit 21 that is movably inserted into the mounting body 11 along the second direction T2, and a spring member 22 connected to the anti-stretcher unit 21. The anti-stretcher unit 21 includes an anti-stretcher 211 extending along the second direction T2, and a cover 212 covering the top side of the anti-stretcher 211.

[0042] The counter-support rod 211 extends downward and backward in the second direction T2, and is located at intervals between the two pushing portions 133 of the control member 13. It has a hollow rod portion 213 that can move through the mounting base tube 111 and pass through the intermediate sleeve 113, a connecting portion 214 located below the mounting base tube 111 and fixedly sleeved on the rod portion 213 for supporting against the ground, a counter-support portion 215 installed at the bottom end of the connecting portion 214, and a second positioning portion 216 formed on the front side of the outer peripheral surface of the rod portion 213. The top side of the rod portion 213 and the intermediate sleeve 113 are radially spaced to define a generally annular telescopic space 210. The cover 212 has a cover portion 217 connected to the top side of the counter-support rod 211 and having a downward-facing inner surface 218, and a surrounding portion 219 extending downward from the outer periphery of the cover portion 217 along the second direction T2 and movably fitted onto the intermediate sleeve 113. In this embodiment, the first positioning portion 125 of the positioning member 121 is a rearwardly extending protrusion, and the second positioning portion 216 is a locking hole that can lock with the first positioning portion 125.

[0043] The elastic member 22 is fitted onto the counter-bracing rod 211 and located in the telescopic space 210, with its two ends abutting against the support surface 114 and the inner surface 218, respectively. The elastic member 22 provides the counter-bracing rod unit 21 with an elastic force that moves the counter-bracing rod unit 21 upward relative to the ground.

[0044] See Figure 2 , Figure 5 and Figure 6 The positioning unit 12 can be in a locked position relative to the mounting body 11 (e.g., Figure 5 ) and an activity location (such as Figure 6 The positioning member 121 moves between the two positions. In the locked position, the first positioning part 125 of the positioning member 121 is engaged with the second positioning part 216 of the counter-support rod 211, preventing the counter-support rod unit 21 from moving along the second direction T2, and the counter-support rod 211 is close to the ground. In the active position, the first positioning part 125 disengages from the second positioning part 216, and the counter-support rod unit 21 is subjected to the upward elastic force of the elastic member 22, moving upward along the second direction T2 away from the ground. At the same time, the top side of the connecting part 214 abuts against the bottom side of the mounting base tube 111, limiting the counter-support rod unit 21 from moving upward.

[0045] In this embodiment, the anti-support part 215 is, for example, but not limited to, a set of rollers. In other variations of this embodiment, the anti-support part 215 can also be a single piece, as long as it can prevent the wheelchair 81 from tipping backward when in the locked position.

[0046] See Figure 2 , Figure 5 During normal use, to ensure that the wheelchair 81 does not tip backward due to instability, the anti-bracing unit 21 is in the locked position. At this time, the first positioning part 125 is engaged with the second positioning part 216, and the anti-bracing part 215 is close to the ground, so that when the wheelchair 81 tilts backward, it can first support the ground to prevent the wheelchair 81 from continuing to tilt backward.

[0047] See Figure 2 and Figure 6When the wheelchair 81 needs to be moved from a lower ground (e.g., a road) to a higher ground (e.g., a sidewalk), a user (not shown) first presses the control member 13 forward along the first direction T1, causing the control member 13 to push the positioning member 121 forward and disengage from the second positioning part 216. Thereby, the counter-support rod 211 is automatically moved upward by the elastic force of the elastic member 22 to a position away from the ground, and the counter-support part 215 is located radially inside the rear wheel 84. Therefore, when the wheelchair 81 rotates with the rear wheel 84 as the support point, the counter-support rod unit 21 will not contact the ground. Thus, the wheelchair 81 is not easily restricted to rotating only a small angle by the counter-support rod 211, and can smoothly rotate the wheelchair 81 backward with its rear wheel as the support point until its front wheel 83 crosses the higher ground, allowing it to continue moving forward until the entire wheelchair 81 is moved to the higher ground.

[0048] Then, the user steps down on the top surface of the cover 212 to move the anti-support rod unit 21 downwards until the second positioning part 216 is locked back into the first positioning part 125, and the anti-support rod unit 21 can then move back to the locked position.

[0049] Because the anti-stiffening unit 21 can be controlled to move up and down between the locked position and the movable position, when the wheelchair 81 needs to be kept stable, the anti-stiffening unit 21 moves to the locked position; when the wheelchair 81 needs to be controlled to rotate backward, the anti-stiffening unit 21 moves to the movable position. Therefore, the anti-stiffening structure 10 can balance the safety and mobility of the wheelchair 81, making it very practical and convenient. It is also worth mentioning that during use, the user pushing the wheelchair from the rear can directly press the control element 13 forward with their foot to automatically move the anti-stiffening unit 211 upward away from the ground, or directly step on the top surface of the cover 212 to move the anti-stiffening unit 21 downward so that the anti-stiffening part 215 is close to the ground. The user does not need to bend over to operate the anti-stiffening structure by hand, making it very convenient to operate.

[0050] See Figures 7 to 9 This is a second embodiment of the anti-strut structure of the present invention. The operation of the second embodiment is similar to that of the anti-strut structure 10 of the first embodiment, and it is also installed on the rear side of the frame 86. The difference is that the mounting base tube 111, the positioning unit 12 and the control member 13 of the control mechanism 1, and the anti-strut mechanism 2, and the control mechanism 1 also includes a support member 14.

[0051] The mounting base tube 111 also has a through groove 115 formed on the top side and extending radially through the first direction T1.

[0052] The positioning unit 12 includes a positioning member 121 pivotally mounted in the mounting space 112 via a pivot member 37, and a reset elastic member 127 connecting the mounting base tube 111 and the positioning member 121. The positioning member 121 has a first positioning portion 125 located on the front side facing the anti-bracing mechanism 2 and having a downward hook shape, and a sleeve portion 128 located on the rear side. The reset elastic member 127 is sleeved on the sleeve portion 128, and its top side is fixedly connected to the positioning member 121, and its bottom side is fixedly connected to the bottom edge of the inner circumferential surface of the mounting base tube 111. The reset elastic member 127 provides an elastic force that drives the sleeve portion 128 to move away from the bottom edge of the inner circumferential surface of the mounting base tube 111 and toward the through groove 115.

[0053] The control element 13 has a pressing portion 131 that extends upward from the top side of the positioning element 121 and protrudes from the through groove 115, and its thickness in the lateral direction is greater than the thickness of the positioning element 121, and it can be pressed.

[0054] The support member 14 is also fixedly installed in the installation space 112, and is located in front of the anti-bracing mechanism 2, extending toward the anti-bracing mechanism 2 and spaced apart from the positioning unit 12.

[0055] The anti-bracing mechanism 2 includes an anti-bracing unit 21 that is movably inserted into the mounting body 11 along the second direction T2, and an elastic member 22 installed in the anti-bracing unit 21. The anti-bracing unit 21 includes a hollow anti-bracing rod 211 extending along the second direction T2, a mounting member 41 fixed in the anti-bracing rod 211 by a fixing bolt 38 and extending vertically along the second direction T2, and a cover 212 covering the top side of the anti-bracing rod 211.

[0056] The counter-support rod 211 has a rod portion 213 extending vertically along the second direction T2, and a counter-support portion 215 mounted at the bottom end of the rod portion 213. The rod portion 213 has a second positioning portion 216 formed on the rear side, and a first slot 42 formed on the front side and extending along the second direction T2, into which the support member 14 protrudes. The second positioning portion 216 is a radially penetrating positioning hole. The mounting member 41 has a second slot 411 extending vertically along the second direction T2, into which the support member 14 can also pass. Thus, the counter-support rod unit 21 can move vertically along the second direction T2 relative to the mounting body 11 of the control mechanism 1. The accompanying drawings of this embodiment show multiple second positioning portions 216 made according to different types of wheelchairs, so as to have the function of adjusting the downward movement distance of the counter-support rod 211. After determining the downward movement distance, the second positioning portions 216 that are not needed can be closed. In actual use, only one second positioning portion 216 is needed.

[0057] The elastic member 22 is located in the counter-bracing rod 211 and is sleeved on the mounting member 41, and is located between the top side of the mounting member 41 and the abutment member 14. The elastic member 22 provides a constant elastic force to push the counter-bracing rod unit 21 away from the ground.

[0058] See Figure 9 and Figure 10 The positioning unit 12 can be in a locked position relative to the mounting body 11 (e.g., Figure 10 ) and an activity location (such as Figure 9 The positioning unit 12 moves between the two positions. In the locked position, the first positioning part 125 of the positioning unit 12 is engaged with the second positioning part 216 of the counter-support rod unit 21, preventing the counter-support rod unit 21 from moving along the second direction T2, and the counter-support rod unit 21 is close to the ground. In the active position, the first positioning part 125 disengages from the second positioning part 216, causing the counter-support rod unit 21 to move upward along the second direction T2 and away from the ground under the elastic force of the elastic member 22.

[0059] In use, step down on the top side of the counter-support unit 21 until the first positioning part 125 engages and locks onto the second positioning part 216, moving it from the active position to the locked position. To reset the counter-support unit 21, press down on the control member 13. The positioning unit 12 rotates in the direction of arrow A, causing the first positioning part 125 to disengage from the second positioning part 216. The counter-support unit 21 then moves upward under the force of the elastic member 22, returning to the active position. Therefore, the counter-support structure 10 of the second embodiment can also accommodate the wheelchair 81 (e.g., Figure 2 The security and mobility (as shown) make it very practical and convenient.

[0060] In summary, the anti-stiffening rod structure 10 of the present invention, utilizing the integrated design of the anti-stiffening rod mechanism 2 and the control mechanism 1, allows the anti-stiffening rod unit 21 to automatically move upward to a position away from the ground when the control member 13 is pressed. It also allows the anti-stiffening rod 211 to move downward when the user steps on the top side of the anti-stiffening rod unit 21 until the first positioning part 125 of the positioning member 121 automatically engages with the second positioning part 216, thus resetting to the locked position. Besides its ease of operation, it also improves the current shortcomings of wheelchairs 81 equipped with the anti-stiffening rod structure 10: it not only maintains the stability of the wheelchair 81 and prevents it from tipping backward, but also allows it to rotate backward at a large angle when needed. Therefore, the wheelchair 81 can move easily on surfaces of various heights, which is very convenient. Thus, the purpose of the present invention is indeed achieved.

[0061] The above description is merely an embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.

Claims

1. A counter-brace structure adapted to be provided on a wheelchair, characterized in that: The counter support rod structure comprises a control mechanism and a counter support rod mechanism. The control mechanism comprises a mounting body adapted to be mounted on the rear side of the wheelchair and extending along a first direction and defining a mounting space, and a positioning unit located in the mounting space and capable of elastic reset, the positioning unit having a first positioning portion. The counter support rod mechanism comprises a counter support rod unit movably inserted into the mounting body along a second direction intersecting the first direction, and a spring member connected to the counter support rod unit and providing elastic force for moving the counter support rod unit in the opposite direction of the ground. The counter support rod unit has a second positioning portion, wherein the positioning unit is movable relative to the mounting body between a locking position and a movable position. In the locking position, the first positioning portion of the positioning unit is latched to the second positioning portion of the counter support rod unit, so that the counter support rod unit cannot move along the second direction, and the counter support rod unit is adjacent to the ground. In the movable position, the first positioning portion is disengaged from the second positioning portion, so that the counter support rod unit is moved away from the ground along the second direction by the elastic force of the spring member. The control mechanism further comprises a control member mounted on the mounting body, which can be operated to move along the first direction to push the positioning unit to move in the first direction.

2. The counter-brace structure of claim 1, wherein: The control member of the control mechanism has a pressing portion located outside the mounting body, and at least one pushing portion connected to the pressing portion and located in the mounting space of the mounting body, which abuts against the positioning unit.

3. The counter-brace structure of claim 2, wherein: The positioning unit comprises a positioning member movably located in the mounting space relative to the mounting body along the first direction, a fixed sheet fixedly arranged in the mounting space and spaced from the positioning member, and an elastic member supported between the positioning member and the fixed sheet. The positioning member has the first positioning portion, and the elastic member has an elastic force constantly pushing the positioning member towards the counter support rod unit.

4. The counter-brace structure of claim 3, wherein: The control member has two said pushing portions spaced from each other, the positioning member is located between the control member and the elastic member, and comprises a supporting portion supported against the elastic member, and the first positioning portion extending from the supporting portion towards the counter support rod unit and capable of being latched to the second positioning portion.

5. The counter-brace structure of claim 1 or 4, wherein: The second positioning portion is a latching hole into which the first positioning portion extends.

6. The counter-brace structure of claim 1, wherein: The counter support rod unit comprises a counter support rod movably inserted into the mounting body along the second direction, and a cover member fixedly arranged on the top side of the counter support rod. The counter support rod extends downward and rearward in the second direction. The spring member is sleeved on the counter support rod and abuts against the mounting body and the cover member.

7. The counter-brace structure of claim 6, wherein: The mounting body has a mounting base pipe extending along the first direction and defining the mounting space, and an intermediate sleeve fixedly connected to the outer circumferential surface of the mounting base pipe and extending along the second direction. The counter support rod is movably arranged in the mounting base pipe and the intermediate sleeve and radially spaced from the intermediate sleeve to define an expansion space for arranging the spring member. The cover member has a cover portion connected to the top side of the counter support rod, and a surrounding portion extending from the outer circumferential edge of the cover portion along the second direction and movably sleeved on the intermediate sleeve along the second direction.

8. The counter-brace structure of claim 7, wherein: The counter support rod unit further has a rod portion movably inserted into the mounting body, a connecting portion fixedly connected to the bottom side of the rod portion and located below the mounting body, and a counter support portion connected to the bottom end of the connecting portion and used for supporting the ground, and in the active position, the connecting portion abuts against the bottom side of the mounting base pipe to limit the upward movement of the counter support rod.

9. The counter-brace structure of claim 2, wherein: The control member has two push portions respectively connected to the pressing portion, and the counter support rod unit extends in the second direction and is located between the push portions.

10. A counter-brace structure adapted to be provided on a wheelchair, characterized by: The counter support rod structure comprises a control mechanism and a counter support rod mechanism, the control mechanism includes a mounting body adapted to be mounted to the rear side of the wheelchair and extending in a first direction and defining a mounting space, and a positioning unit located in the mounting space and capable of being elastically reset, the positioning unit has a first positioning portion, the counter support rod mechanism includes a counter support rod unit movably inserted into the mounting body in a second direction intersecting the first direction, and a resilient member connected to the counter support rod unit and providing an elastic force for moving the counter support rod unit in the opposite direction of the ground, the counter support rod unit has a second positioning portion, wherein the positioning unit is movable relative to the mounting body between a locked position and an active position, in the locked position, the first positioning portion of the positioning unit is latched to the second positioning portion of the counter support rod unit, so that the counter support rod unit cannot move in the second direction, and the counter support rod unit is adjacent to the ground, in the active position, the first positioning portion is disengaged from the second positioning portion, so that the counter support rod unit is moved upward in the second direction by the elastic force of the resilient member to move away from the ground, wherein the mounting body has a through slot, the positioning unit includes a positioning member pivoted in the mounting space, and a reset resilient member connected between the mounting body and the positioning member, the control mechanism further includes a control member connected to the top side of the positioning member and protruding out of the through slot for pressing, and a support member mounted in the mounting space and extending towards the counter support rod mechanism and spaced from the positioning member.

11. The counter-brace structure of claim 10, wherein: The positioning member has a first positioning portion located on the front side and towards the counter support rod mechanism, and a sleeving portion located on the rear side, the reset resilient member is sleeved in the sleeving portion and provides an elastic force for driving the sleeving portion to move towards the through slot.

12. The counter-brace structure of claim 11, wherein: The counter support rod unit includes a counter support rod extending in the second direction and being hollow and having the second positioning portion, and a mounting member arranged in the counter support rod and extending in the second direction, the resilient member is mounted in the counter support rod and sleeved in the mounting member and located between the mounting member and the support member.

13. The counter-brace structure of claim 12, wherein: The counter support rod further has a first slot extending in the second direction and for the support member to protrude into, and the mounting member has a second slot extending up and down in the second direction and for the support member to also be able to pass through.

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