Bicycle repair stand that can be adjusted up and down

Abstract

A bicycle repair stand that can be adjusted up and down, which includes a base, an upright rod, a lifting link group, a lifting seat, a linkage rod group and a holding elastic member, a resistance section and a force application section of the lifting link group are located on both sides of a pivot point, respectively, the pivot point is pivoted to the upright rod, such that the resistance section and the force application section are located at both sides of the upright rod, this allows the lifting link group to generate a force arm that can effectively apply force to the lifting seat, moreover, a first pull part of the holding elastic member is directly connected to a force application part of the lifting link group, so that an elastic strip part of the holding elastic member provides a vertical pulling force in the downward direction to the lifting link group, thereby, the lifting seat has a better lifting effect.

Description

Technical Field

[0001] This invention relates to bicycle repair racks, and in particular to a height-adjustable bicycle repair rack. Prior Technology

[0002] A bicycle repair rack is a tool used to secure a bicycle for repair or maintenance. It allows the bicycle to be stably suspended at different angles and heights, making it easier to repair components such as tires, chains, and derailleurs.

[0003] Referring to Figure 1, which shows a diagram of a "height-adjustable bicycle repair rack" provided by Republic of China Patent Application No. 113204933, it consists of a footrest (not shown), a pole 11, a lifting linkage unit 12, a clamp 13, a limiting member 14, and a locking release unit 15. The lifting linkage unit 12 is designed so that the clamp 13 can lift and lower after clamping the bicycle, so as to adjust the repair height. Through the design of the brake member 151 and the first elastic body 152 of the locking release unit 15, the lifting seat 121 of the lifting linkage unit 12 is positioned after lifting and lowering. The design of the second elastic body 16 in conjunction with the lifting linkage unit 12 makes it easier to lift the bicycle by utilizing the elasticity of the second elastic body 16, thus improving convenience.

[0004] However, the configuration of the prior art limited the holding effect of the second elastic body 16, resulting in a significant lack of effort-saving effect when the lifting seat 121 is raised. The main reason for this is the poor force direction. That is, since the second elastic body 16 extends upward from the lower fixed part 111, passes the guide wheel 112 above the column 11, and then connects downward to the upper fixed part 1211 of the lifting linkage unit 12, the second elastic body 16 generates an additional angle change after passing the guide wheel 112, so that some of the elastic force is consumed in the lateral component force instead of the pure vertical pulling force. As a result, the force direction of the lifting linkage unit 12 is closer to the horizontal. Since the horizontal component force cannot effectively overcome the gravity of the lifting seat 121, the lifting effect is poor. Summary of the Invention

[0005] The purpose of this invention is to provide a height-adjustable bicycle repair rack, which mainly provides a vertical pulling force to the lifting linkage assembly, making the lifting seat more labor-saving.

[0006] To achieve the aforementioned objectives, the present invention provides a height-adjustable bicycle repair rack, comprising: a footrest; a vertical pole fixed to the footrest, having a first side and a second side on opposite sides; a lifting linkage assembly having a fulcrum pivotally mounted on the vertical pole, a resistance portion located on the first side, and a force-applying portion located on the second side, wherein the force-applying portion and the fulcrum form a force-applying arm; a lifting seat assembled on the resistance portion and lifting and lowering with the pivoting of the lifting linkage assembly; a linkage assembly pivotally mounted on the lifting linkage assembly and the vertical pole, and located below the force-applying portion; and a tensioning elastic member having a first tensioning portion connected to the force-applying portion and a second tensioning portion connected to the linkage assembly; wherein the length of the tensioning elastic member in its normal state is L, and the length of the tensioning elastic member after stretching is S, satisfying the following condition: 1.07L≦S≦1.20L.

[0007] The advantages of this invention are as follows: By designing the resistance part and the force-applying part of the lifting linkage assembly to be located on both sides of the fulcrum, the fulcrum of the lifting linkage assembly is pivotally mounted behind the upright, and the resistance part and the force-applying part are located on both sides of the upright. This allows the lifting linkage assembly to generate a force-applying arm that can effectively apply force to the lifting seat. At the same time, the design of the first holding part of the holding elastic member being directly connected to the force-applying part of the lifting linkage assembly allows the elastic strip of the holding elastic member to provide a downward vertical pulling force to the lifting linkage assembly, avoiding the loss of some elastic force in the lateral component due to additional angle changes. Therefore, this invention can reduce the lateral component force generated by the holding elastic member, making the lifting seat lifting effortless. In addition, when the tension elastic element meets the condition of 1.07L≦S≦1.20L, the problem of insufficient tension caused by the tension elastic element being too short can be solved, as well as the problem of decreased tension and fatigue caused by the tension elastic element being too long, thereby reducing the problem of elastic force attenuation of the tension elastic element.

[0008] Preferably, the bicycle repair rack further includes a clamp, a limiting member, and a braking member; the clamp is fixed to the lifting seat and used to clamp a bicycle; the limiting member is fixed to the upright and has a plurality of limiting grooves arranged in a longitudinal direction; the braking member has a braking pivot portion pivotally mounted on the lifting linkage assembly and a locking portion for locking or disengaging from the limiting grooves.

[0009] Preferably, the tensioning elastic element is an elastic cord, a stretch cord, or a pull rope.

[0010] Preferably, the lifting linkage assembly includes two first lifting linkages and two second lifting linkages; the two first lifting linkages are parallel to each other and each has a fulcrum portion pivotally mounted on the upright, a resistance portion located on the first side, and a force-applying portion located on the second side; the two second lifting linkages are parallel to each other and each has a first pivot portion pivotally mounted on the upright, a second pivot portion pivotally mounted on the lifting seat, and a third pivot portion opposite to the second pivot portion and pivotally mounted on the lifting linkage assembly.

[0011] Preferably, the linkage assembly includes two first fixed rods, two second fixed rods, two third fixed rods, two first linkage rods, two second linkage rods, two third linkage rods, and two fourth linkage rods. The two first fixed rods are fixed to the upright and each has a first fixing part located on the second side and lower than the force-applying part. The two second fixed rods are fixed to the upright and located below the first fixed rods and each has a second fixing part located on the second side. The two third fixed rods are fixed to the upright and located below the second fixed rods and each has a third fixing part located on the second side. The two first linkage rods are pivotally mounted on the upright and each has a first linkage part. The two second linkage rods are pivotally mounted on the second fixed part and each has a second linkage part. The two third linkage rods are pivotally mounted between the first linkage part and the second linkage part. The two fourth linkage rods are pivotally mounted on the first linkage rod and each has a fourth linkage part pivotally mounted on the third pivot part.

[0012] Preferably, the tensioning elastic member further includes an elastic strip portion disposed between the first tensioning portion and the second tensioning portion, the elastic strip portion passing around the first fixing portion and the second linkage portion, and the second tensioning portion of the tensioning elastic member connecting to the third fixing portion. Preferably, the elastic strip portion has a straight elastic segment extending downward from the first tensioning portion to the first fixing portion.

[0013] Preferably, the linkage assembly includes two first fixed rods, two first linkage rods, two second linkage rods, two third linkage rods, and two fourth linkage rods. The two first fixed rods are fixed to the upright and each has a first fixed part located on the second side and lower than the force-applying part. The two first linkage rods are pivotally mounted on the third pivot and each has a first linkage part. The two second linkage rods are pivotally mounted on the first linkage part and each has a second linkage part for connection to the second holding part. The two third linkage rods are pivotally mounted on the upright and each has a third linkage part. The two fourth linkage rods are pivotally mounted between the third linkage part and the second linkage rod.

[0014] Preferably, the tensioning elastic member further includes an elastic strip portion disposed between the first tensioning portion and the second tensioning portion, the elastic strip portion passing around the first fixing portion, and the second tensioning portion of the tensioning elastic member being connected to the second linkage portion. Preferably, the elastic strip portion has a straight elastic segment extending downward from the first tensioning portion to the first fixing portion. Simple Explanation of the Diagram

[0015] Figure 1 is a side view of a conventional bicycle repair rack; Figure 2 is a perspective view of the first embodiment of the present invention; Figure 3 is a magnified view of a portion of Figure 2; Figure 4 is a partial exploded perspective view of the first embodiment of the present invention; Figure 5 is a partial side view of the first embodiment of the present invention, showing the lifting seat at its lowest height; Figure 6 is a usage diagram of the first embodiment of the present invention, showing the state where the lifting seat is adjusted to the middle height; Figure 7 is a usage diagram of the first embodiment of the present invention, showing the lifting seat adjusted to its highest height; Figure 8 is a partial perspective view of the second embodiment of the present invention; Figure 9 is a partial side view of the second embodiment of the present invention, showing the lifting seat at its lowest height. Figure 10 is a usage diagram of the second embodiment of the present invention, showing the state where the lifting seat is adjusted to the middle height; Figure 11 is a usage state diagram of the second embodiment of the present invention, showing the state of the lifting seat adjusted to the highest height. Implementation

[0016] The directional terms used in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the accompanying drawings. Therefore, the directional terms used in the embodiments are for illustrative purposes and not for limiting the invention. Furthermore, in the following description, similar elements and parts are represented by the same numbers.

[0017] Referring to Figures 2 to 5, the first embodiment of the present invention provides a height-adjustable bicycle repair rack, which mainly consists of a footrest 21, a vertical pole 23, a lifting linkage assembly 30, a lifting seat 41, a clamp 43, a limiting member 50, a braking member 60, a linkage assembly 70, and a tensioning elastic member 80, wherein:

[0018] The foot 21 is a stable seat. In this embodiment, the foot 21 is flat, but it is not limited to this and can also be in the form of two legs, triangle, four legs, etc.

[0019] The upright 23 is fixed on the base 21 and has a first side 231 and a second side 232 on opposite sides. In this embodiment, with FIG5 as the directional definition reference and the upright 23 as the boundary, the left side of the upright 23 is defined as the first side 231 and the right side of the upright 23 is defined as the second side 232.

[0020] The lifting linkage assembly 30 is pivotally mounted on the upright 23 and includes two first lifting linkages 31 and two second lifting linkages 32. The two first lifting linkages 31 are parallel to each other and each has a fulcrum portion 311 pivotally mounted on the upright 23, a resistance portion 312 located on the first side 231 of the upright 23, and a force-applying portion 313 located on the second side 232 of the upright 23. A force-applying arm 314 is formed between the force-applying portion 313 and the fulcrum portion 311. The two second lifting linkages 32 are parallel to each other and located below the two first lifting linkages 31. Each second lifting linkage 32 has a first pivot portion 321 pivotally mounted on the upright 23, a second pivot portion 322 located on the first side 231 of the upright 23, and a third pivot portion 323 opposite to the second pivot portion 322 and located on the second side 232 of the upright 23.

[0021] The lifting seat 41 is pivotally mounted on the resistance portion 312 of the first lifting link 31 and the second pivot portion 322 of the second lifting link 32, so that the lifting seat 41 can rise and fall with the pivoting of the lifting link assembly 30.

[0022] The clamp 43 is fixed to the lifting seat 41 and is used to clamp a bicycle 100 (as shown in Figure 2). In this embodiment, the clamp 43 has a clamping part 431 for clamping the bicycle 100.

[0023] The limiting member 50 is fixed to the upright 23 and has a plurality of limiting grooves 51 arranged in a longitudinal direction and a closed strip hole 52 communicating with each of the limiting grooves 51.

[0024] The brake member 60 has a brake pivot 61 pivotally mounted between the two first lifting links 31, a locking part 62 for locking or disengaging from one of the limiting grooves 51, and a lever part 63 located further away from the locking part 62 than the brake pivot 61. The locking part 62 is further constrained by the closed slot 52 of the limiting member 50 to prevent the locking part 62 from completely disengaging from the limiting member 50.

[0025] The linkage assembly 70 is pivotally mounted on the lifting linkage assembly 30 and the upright 23, and is located on the second side 232 of the upright 23. Simultaneously, the linkage assembly 70 is located below the force-applying portion 313 of the first lifting linkage 31. In this embodiment, the linkage assembly 70 includes two first fixed rods 71, two second fixed rods 72, two third fixed rods 73, two first connecting rods 74, two second connecting rods 75, two third connecting rods 76, and two fourth connecting rods 77. The two first fixed rods 71 ​​are fixed to the upright 23, and each has a first fixed portion 711 located on the second side 232 and lower than the force-applying portion 313. Each first fixed portion 711 is provided with a guide wheel 78. The two second fixed rods 72 are fixed to the upright 23 and located below the first fixed rods 71. Each has a second fixing part 721 located on the second side 232. The two third fixing rods 73 are fixed to the upright 23 and located below the second fixing rod 72, and each has a third fixing part 731 located on the second side 232. The two first linkage rods 74 are pivotally mounted on the upright 23, and each has a first linkage part 741. The two second linkage rods 75 are pivotally mounted on the second fixing part 721, and each has a second linkage part 751. The second linkage part 751 is also provided with a guide wheel 78. The two third linkage rods 76 are pivotally mounted between the first linkage part 741 and the second linkage part 751. The two fourth linkage rods 77 are pivotally mounted on the first linkage rod 74, and each has a fourth linkage part 771 pivotally mounted on the third pivot part 323 of the second lifting linkage 32.

[0026] The tensioning elastic element 80 is an elastic cord, but it is not limited to this; it can also be a stretch cord or pull rope, or other elements with elastic properties. The tensioning elastic element 80 has a first tensioning part 81, a second tensioning part 82, and an elastic strip 83 disposed between the first tensioning part 81 and the second tensioning part 82. The first tensioning part 81 is located on the second side 232 of the upright 23 and is connected to the force-applying part 313 of the first lifting link 31. The second tensioning part 82 is located on the second side 232 of the upright 23 and is connected to the third fixing part 731 of the third fixing rod 73. Referring to Figure 5, the elastic strip 83 extends from the first tensioning part 81 downwards, passing over the guide wheel on the first fixing part 711. 78 and the guide wheel 78 that winds upwards around the second linkage 751, so the elastic strip 83 also has a straight elastic segment 831 extending downwards from the first holding part 81 to the guide wheel 78; in this embodiment, the length of the holding elastic member 80 in its normal state is L, and the length of the holding elastic member 80 after stretching is S, and the following conditions are satisfied: 1.07L≦S≦1.20L; as shown in FIG5, the length of the holding elastic member 80 after stretching is S=1.10L; as shown in FIG7, the length of the holding elastic member 80 after stretching is S=1.14L.

[0027] The above describes the structure and configuration of the main components of the first embodiment of the present invention. The efficacy of the present invention is explained below.

[0028] Firstly, referring to Figure 5, by designing the resistance part 312 and the force-applying part 313 of the lifting linkage assembly 30 to be located on both sides of the fulcrum part 311, the fulcrum part 311 of the lifting linkage assembly 30 is pivotally mounted on the upright 23, and the resistance part 312 and the force-applying part 313 are located on both sides of the upright 23, so that the lifting linkage assembly 30 generates a force-applying arm 314 that can effectively apply force to the lifting seat 41, and at the same time, it is directly connected to the first holding part 81 of the holding elastic member 80. The design of the force-applying part 313 of the lifting linkage assembly 30 allows the elastic strip 83 of the holding elastic member 80 to provide a downward vertical pulling force to the lifting linkage assembly 30. This avoids the additional angle change between the linear elastic segment 831 of the holding elastic member 80 and the force-applying part 313 of the first lifting linkage 31, which would cause some of the elastic force to be consumed in the lateral component. Therefore, the present invention can reduce the lateral component force generated by the holding elastic member 80, making the lifting seat 41 more labor-saving.

[0029] Secondly, the present invention features a special design for the holding elastic element 80, namely, that the normal length of the holding elastic element 80 is L, and the stretched length of the holding elastic element 80 is S, satisfying the following condition: 1.07L≦S≦1.20L. Accordingly, when the holding elastic element 80 satisfies the aforementioned conditions, the problem of insufficient holding force caused by the excessively short stretched length of the holding elastic element 80 is solved, as is the problem of decreased holding force and fatigue caused by the excessively long stretched length of the holding elastic element 80, thereby reducing the elasticity attenuation problem of the holding elastic element 80.

[0030] Thirdly, referring to Figures 5 to 7, through the design of each fixed rod and each linkage rod of the linkage group 70, when the lifting seat 41 is adjusted to a high position or a low position, the state of the linkage group 70 after pivoting will not be too far away from the upright 23. Therefore, it can be used in maintenance sites with limited space, effectively improving applicability.

[0031] Lifting upwards: Referring to Figures 5 to 7, the lifting seat 41 or clamp 43 is supported from below and lifted upwards. At this time, the lifting linkage 30 will pivot. The lifting linkage 30 in the pivot will drive the brake 60 to pivot and move upwards. At this time, the locking part 62 of the brake 60 slides along the contour of the limiting groove 51, allowing the locking part 62 to gradually disengage from the lowermost limiting groove 51 of the limiting member 50. At this time, the lifting linkage 30 is pulled downwards by the holding elastic member 80 and rotates clockwise by an angle. At the same time, the linkage rods of the linkage 70 are linked and the holding elastic member 80 gradually becomes longer to increase the holding force. During the process of the lifting linkage assembly 30 driving the brake 60 to pivot and move upward, once the height of the lifting seat 41 or clamp 43 is adjusted to the positioning, the brake 60 is moved and pivoted counterclockwise around the brake pivot 61, so that the locking part 62 of the brake 60 is locked again in the limiting groove 51 of the limiting member 50 at the required height, thus completing the positioning of the lifting seat 41 after upward adjustment. Referring to Figure 6, the state of the lifting seat 41 adjusted to the middle height is shown; referring to Figure 7, the state of the lifting seat 41 adjusted to the highest height is shown.

[0032] Lowering: Referring to Figure 7, turn the lever 63 of the brake 60 clockwise to disengage the locking part 62 laterally from the limiting groove 51, thereby lowering the lifting seat 41 to the desired height. Referring to Figure 6, after the height is determined, turn the lever 63 of the brake 60 counterclockwise to re-lock the locking part 62 of the brake 60 into the limiting groove 51 of the limiting member 50 at the desired height, thus completing the positioning of the lifting seat 41 after downward adjustment.

[0033] Referring to Figures 8 to 11, the second embodiment of the present invention provides a height-adjustable bicycle repair rack, which differs from the first embodiment in the composition design of the linkage group 70 and the winding method of the tension elastic member 80.

[0034] The linkage assembly 70 includes two first fixed rods 71, two first linkage rods 74, two second linkage rods 75, two third linkage rods 76, and two fourth linkage rods 77. The two first fixed rods 71 ​​are fixed to the upright 23 and each has a first fixing part 711 located on the second side 232 of the upright 23 and lower than the force-applying part 313 of the first lifting linkage 31. The two first linkage rods 74 are pivotally mounted on the third pivot part 323 of the second lifting linkage 32 and each has a first linkage part 741. The two second linkage rods 75 are pivotally mounted on the first linkage part 741 and each has a second linkage part 751 for connection to the second holding part 82. The two third linkage rods 76 are pivotally mounted on the upright 23 and each has a third linkage part 761. The two fourth linkage rods 77 are pivotally mounted between the third linkage part 761 and the second linkage rods 75.

[0035] The first holding part 81 of the holding elastic member 80 is located on the second side 232 of the upright 23 and is connected to the force-applying part 313 of the first lifting link 31. The second holding part 82 of the holding elastic member 80 is located on the second side 232 of the upright 23 and is connected to the second linking part 751 of the second linking rod 75. As shown in FIG8, the elastic strip part 83 of the holding elastic member 80 passes around the guide wheel 78 on the first fixing part 711 from top to bottom.

[0036] Figure 9 shows the lifting seat 41 at its lowest height; Figure 10 shows the lifting seat 41 at its middle height; and Figure 11 shows the lifting seat 41 at its highest height.

[0037] 100: Bicycle 11: Erecting poles 111: Lower fixing part 112: Guide wheel 12: Lifting Linkage Unit 121: Adjustable seat 1211: Upper fixing part 13: Fixture 14: Limiting components 15: Lock Release Unit 151: Braking components 152: First elastic body 16: Second elastic body 21: Foot base 23: Erecting poles 231: First side 232: Second side 30: Lifting Linkage Assembly 31: First lifting linkage 311: Fulcrum Department 312: Resistance Department 313: Force-Exerting Unit 314: Lever arm 32: Second lifting linkage 321: First Pivot 322: Second Pivot 323: Third Pivot 41: Adjustable seat 43: Fixture 431: Clamping part 50: Limiting component 51: Limiting groove 52: Closed hole 60: Braking components 61: Braking pivot 62: Fastening section 63: Lever section 70: Linkage rod assembly 71: First fixing rod 711: First fixing part 72: Second fixing rod 721: Second fixing part 73: Third fixing rod 731: Third fixing part 74: First linkage 741: First Linkage Section 75: Second linkage 751: Second Linkage Section 76: Third linkage 761: Third Linkage Section 77: Fourth linkage 771: Fourth Link 78: Guide wheel 80: Tension elastic element 81: First Pulling Section 82: Second Pulling Section 83: Elastic strip 831: Linear Elastic Segment

Claims

1. A height-adjustable bicycle repair rack, comprising: a footrest; a vertical pole fixed to the footrest and having a first side and a second side opposite to each other; a lifting linkage assembly having a fulcrum pivotally mounted on the vertical pole, a resistance portion located on the first side, and a force-applying portion located on the second side, wherein the force-applying portion and the fulcrum form a force-applying arm; a lifting seat assembled on the resistance portion and lifting and lowering with the pivoting linkage assembly; a linkage assembly pivotally mounted on the lifting linkage assembly and the vertical pole, and located below the force-applying portion; and a tension elastic member having a first tension portion connected to the force-applying portion and a second tension portion connected to the linkage assembly; wherein the length of the tension elastic member in its normal state is L, and the length of the tension elastic member after extension is S, and satisfies the following condition: 1.07L≦S≦1.20L.

2. The height-adjustable bicycle repair rack as described in claim 1, wherein, The bicycle repair rack also includes a clamp, a limiting member, and a brake; the clamp is fixed to the lifting seat and is used to clamp a bicycle; the limiting member is fixed to the upright and has a plurality of limiting grooves arranged in a longitudinal direction; the brake has a brake pivot portion pivotally mounted to the lifting linkage assembly and a locking portion for locking or disengaging from the limiting grooves.

3. The height-adjustable bicycle repair rack as described in claim 1, wherein, The tensioning elastic element is an elastic cord, a stretch cord, or a pull rope.

4. The height-adjustable bicycle repair rack as described in claim 2, wherein, The lifting linkage assembly includes two first lifting linkages and two second lifting linkages; the two first lifting linkages are parallel to each other and each has a fulcrum portion pivotally mounted on the upright, a resistance portion located on the first side, and a force-applying portion located on the second side; the two second lifting linkages are parallel to each other and each has a first pivot portion pivotally mounted on the upright, a second pivot portion pivotally mounted on the lifting seat, and a third pivot portion opposite to the second pivot portion and pivotally mounted on the lifting linkage assembly.

5. The height-adjustable bicycle repair rack as described in claim 4, wherein, The linkage assembly includes two first fixed rods, two second fixed rods, two third fixed rods, two first linkage rods, two second linkage rods, two third linkage rods, and two fourth linkage rods. The two first fixed rods are fixed to the upright and each has a first fixing part located on the second side and lower than the force-applying part. The two second fixed rods are fixed to the upright and located below the first fixed rods and each has a second fixing part located on the second side. The two third fixed rods are fixed to the upright and located below the second fixed rods and each has a third fixing part located on the second side. The two first linkage rods are pivotally mounted on the upright and each has a first linkage part. The two second linkage rods are pivotally mounted on the second fixed part and each has a second linkage part. The two third linkage rods are pivotally mounted between the first linkage part and the second linkage part. The two fourth linkage rods are pivotally mounted on the first linkage rod and each has a fourth linkage part pivotally mounted on the third pivot part.

6. The height-adjustable bicycle repair rack as described in claim 5, wherein, The tensioning elastic member also has an elastic strip portion disposed between the first tensioning portion and the second tensioning portion, the elastic strip portion passing around the first fixing portion and the second linkage portion, and the second tensioning portion of the tensioning elastic member is connected to the third fixing portion.

7. The height-adjustable bicycle repair rack as described in claim 6, wherein, The elastic strip has a straight elastic segment extending downward from the first holding part to the first fixing part.

8. The height-adjustable bicycle repair rack as described in claim 4, wherein, The linkage assembly includes two first fixed rods, two first linkage rods, two second linkage rods, two third linkage rods, and two fourth linkage rods. The two first fixed rods are fixed to the upright and each has a first fixed part located on the second side and lower than the force-applying part. The two first linkage rods are pivotally mounted on the third pivot and each has a first linkage part. The two second linkage rods are pivotally mounted on the first linkage part and each has a second linkage part for connection to the second holding part. The two third linkage rods are pivotally mounted on the upright and each has a third linkage part. The two fourth linkage rods are pivotally mounted between the third linkage part and the second linkage rod.

9. The height-adjustable bicycle repair rack as described in claim 8, wherein, The tensioning elastic member also has an elastic strip portion disposed between the first tensioning portion and the second tensioning portion, the elastic strip portion passing around the first fixing portion, and the second tensioning portion of the tensioning elastic member being connected to the second linkage portion.

10. The height-adjustable bicycle repair rack as described in claim 9, wherein, The elastic strip has a straight elastic segment extending downward from the first holding part to the first fixing part.

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