Bicycle repair stand structure

Abstract

This utility model discloses a bicycle repair frame structure, including a clamping device and a lifting adjustment device. The adjusting clamp has a clamping part and a quick-release handle at the rear end. The rotating seat has a positioning ring and a control handle. The lifting adjustment device includes a lifting rod and a ring, as well as a hand crank. The longitudinal side of the first support tube wall has an adjustment track with a chain embedded in it, and the top side of the ring tube wall has a guide hole opposite to it. The hand crank has a transmission component, a driving component, and a hand crank, and is assembled with two interlocking housings to form a transmission mechanism. It works with the chain to form a transmission mechanism, so that the worm gear meshes with the helical gear. The meshing part of the transmission component's tooth plate extends through the guide hole of the ring and meshes with the chain of the first support adjustment track. Rotating the hand crank rotates the connecting rod, which in turn drives the worm gear of the driving component to rotate the helical gear tooth plate. The meshing part tightly abuts against the adjustment track chain, which drives the lifting rod to steadily adjust the lifting displacement stroke, so as to achieve the purpose of omnidirectional rotation adjustment angle and stable adjustment of the lifting position.

Description

Technical Field

[0001] This utility model relates to a bicycle repair rack structure, and more particularly to a bicycle repair rack that can provide bicycle stand and adjustable height for maintenance. Background Technology

[0002] Generally, self-maintenance support frames are available, which are equipped with inner and outer telescopic tubes and a quick-release collar. This allows for quick extension or retraction of the inner and outer tubes to the required height before pressing down and locking the positioning quick-release collar to fix the height of the adjustable tubes. Although the telescopic positioning height can be quickly adjusted, when the top clamp holds a heavy workpiece to be repaired, there is a risk of sudden slippage due to the weight of the workpiece when the quick-release collar is opened to extend the telescopic rod, resulting in a lack of safety.

[0003] In light of the aforementioned structural deficiencies, the creator devoted considerable effort to research and design, and with unwavering dedication, through intensive study, numerous tests and experiments, and with a fully refined concept and improvements, finally completed this work. Utility Model Content

[0004] The main objective of this invention is to provide a bicycle repair rack structure.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: The bicycle repair frame structure of this utility model includes: a clamping device, comprising an adjusting clamp and a rotating base connected to the adjusting clamp; the front end of the adjusting clamp has a clamping part that can clamp up and down, and the rear end has a quick-release handle that can adjust the clamping tightness; one end of the rotating base has two separable positioning rings with male and female meshing teeth, and the end away from the adjusting clamp has a control handle that can pivot and lock for positioning; a lifting adjustment device, comprising: a lifting rod, comprising: a first bracket, attached to a longitudinal axial section of the tube wall. A longitudinal adjustment track with a chain bar embedded and a smooth groove are recessed on each longitudinal side. Two grooves are recessed on the horizontal axis of the tube wall opposite to the longitudinal side. A second support is provided with a flange with a diameter larger than that of the first support protruding upward from the top of the tube wall, which can be compatible with the first support. A ring is provided between the first and second supports, which abuts against the flange of the first support on the tube wall. A guide hole and a spring are provided on the tube wall on the opposite longitudinal side of the adjustment track and groove of the first support. Two ribs are provided on the tube wall on the opposite longitudinal side of the two grooves of the first support.

[0006] A hand crank base includes: a transmission component, which consists of a geared disc with several meshing teeth connected to a helical gear, and a positioning post protruding from the center of one end of both the geared disc and the helical gear; a drive component, which is a connecting rod, with a worm gear on one side of the connecting rod that abuts and drives the helical gear of the transmission component, and a bushing sleeve fitted on the end of the connecting rod away from the transmission component; a hand crank, which is configured as a crank arm, with a gripping part on one outer end of the crank arm, and a positioning part on one inner end of the gripping part that abuts against the bushing sleeve of the drive component and connects to the end connecting rod; and two lock housings, which are two separable and combinable covers, with first and second tube openings respectively recessed on one side of the interior, and two opposing grooves respectively provided at the first tube opening corresponding to the two ribs of the collar tube wall. The other two sides are respectively equipped with gear sleeves and worm gear sleeves; the clamping device uses the front clamping part of the adjusting chuck to clamp the workpiece, and the rear quick-release handle can adjust the clamping tightness. The opening and closing control handle of the rotating chuck can be linked to the positioning ring to open and close and adjust the positioning angle of the chuck. The transmission mechanism of the chain-type lifting and adjusting device is formed by the transmission component of the hand crank with toothed disc and helical gear, and the driving component with worm gear and connecting rod, which cooperates with the chain of the adjusting rail. This allows the chain of the adjusting rail to reliably and securely mesh with the toothed part of the transmission component, resulting in better transmission efficiency and durability. It effectively and securely controls the lifting position of the adjusting rod, so as to present a bicycle repair frame that can rotate and adjust the angle and control the lifting adjustment in all directions.

[0007] This utility model utilizes a chain-type lifting adjuster, which consists of a lifting rod with first and second supports forming retractable inner and outer tubes. A hollow tubular collar is fitted between the inner and outer tubes of the first and second supports, with one end of the collar abutting the top of the second support forming the outer tube, and the other end allowing the inner tube to pass through. A guide hole is cut into the side wall of the collar tube, and an adjusting track with a chain embedded is provided opposite to the longitudinal side wall of the first support forming the inner tube. A hand crank base lock housing has a first side with openings for the first and second tubes to accommodate the collar and the top of the second support. The second side accommodates a transmission component with a gear and helical gear, a drive component with a worm gear and connecting rod, and a component connected to the drive component. The hand crank connected to the lever works in conjunction with the adjusting track chain to form a transmission mechanism that controls the raising and lowering of the lifting lever. This ensures that the adjusting track chain reliably and securely meshes with the gear teeth of the transmission component, preventing wear or tooth breakage due to excessive rotational load during meshing. It also prevents the load-bearing workpiece from slipping down suddenly under gravity. Furthermore, it is pivotally mounted at the top with a clamping device featuring an adjusting chuck and a rotating seat, allowing for movable control of the vertical rotation angle. It also effectively and securely controls the raising and lowering position of the lifting lever, preventing slippage under the influence of load. This results in a bicycle repair frame that allows for omnidirectional rotational adjustment of the angle and stable adjustment of the lifting position. Attached Figure Description

[0008] Figure 1 This is a perspective view of the present utility model.

[0009] Figure 2 This is a partially enlarged three-dimensional representation of the present invention. Figure 1 .

[0010] Figure 3 This is a partially enlarged three-dimensional representation of the present invention. Figure 2 .

[0011] Figure 4 This is a partially enlarged exploded perspective view of this utility model.

[0012] Figure 5 This is a sectional view of the lifting rod section of this utility model.

[0013] Figure 6 This is a schematic diagram of the use of the lifting rod of this utility model. Figure 1 .

[0014] Figure 7 This is a schematic diagram of the use of the lifting rod of this utility model. Figure 2 .

[0015] Figure 8 This is a schematic diagram of the use of the lifting rod of this utility model. Figure 3 .

[0016] Figure 9 Tie Figure 8 A partially enlarged sectional view.

[0017] [Symbol Explanation]

[0018] 100 bicycle repair rack; 10 clamping device; 11 adjusting chuck; 111 clamping part.

[0019] 112 Quick-release handle 12 Rotary bracket 121 Positioning ring 122 Control handle

[0020] 123 Joint 20 Lifting and Adjusting Device 21 Lifting Rod 211 First Support

[0021] 2110 Hollow tube body 2111 Adjustable track 2112 Track groove 2113 Channel

[0022] 2114 Chain; 212 Second Support; 2120 Hollow Tube; 2121 Flange

[0023] 213 collar, 2131 guide channel, 2132 spring clip, 2133 rib

[0024] 22 Hand crank base 221 Transmission component 2211 Gear disc 2212 Helical gear

[0025] 2213 Positioning pin; 222 Drive component; 2221 Turbine; 2222 Connecting rod

[0026] 2223 Bushing, 223 Hand Crank, 2231 Crank Arm, 2232 Grip

[0027] 2233 Positioning hole; 224 Lock housing; 2240 Locking hole; 2241 First sleeve opening

[0028] 2242 Second sleeve opening; 2243 Gear sleeve opening; 2244 Worm rod sleeve opening; 2245 Groove.

[0029] 2246 Adjustment hole; 2247 Positioning bolt; 23 Pivot seat; 231 Fitting part

[0030] 232 Pivot Ear 233 Pivot Component 30 Base 31 Movable Binding Ring

[0031] 32 tripod, 33 connecting rod, 50 locking assembly, X power tools Detailed Implementation

[0032] like Figures 1-5As shown, firstly, the structural composition and connection relationship of each component of this utility model will be explained. The bicycle repair rack 100 includes: a clamping device 10, a lifting adjustment device 20, and a base 30. The clamping device 10 includes an adjusting chuck 11 and a rotating seat 12 connected to the adjusting chuck 11. The front end of the adjusting chuck 11 has a clamping part 111 that can clamp up and down, and the rear end has a quick-release handle 112 that can adjust the clamping tightness. The rotating seat 12 has two separable and engaging positioning rings 121 and a control handle 122 that is linked to the positioning rings 121, which is used to operate the control handle 122 to open and close the positioning rings 122 to adjust the positioning angle of the adjusting chuck 11. The lifting adjustment device 20 includes a lifting rod 21 and a hand crank 22. The lifting rod 21 has two mutually compatible extensions that can extend inward and outward. The tube has first and second supports 211 and 212, and a collar 213 abutting between the first and second supports. The first support 211 is an inner tube with an adjustment track 2111 embedded with a chain 2114 and a smooth groove 2112 recessed on two opposite longitudinal sides of the tube wall. The second support 212 is an outer tube with a flange 2121 protruding upward from the top of the tube wall for abutting against the collar 213 and for receiving and extending the first support 211. The collar 213 has guide holes 2131 and spring pieces 2132 on opposite longitudinal sides of the adjustment track 2111 and groove 2112 of the first support 211, for the meshing part of the transmission component 221 of the hand crank 22 to be exposed. The chain 2114 meshes with the adjusting track 2111, and two ribs 2133 are provided on the longitudinal side of the corresponding first bracket 211's second groove 2113 to be fitted into the first bracket 211's groove 2113, forming a linearly moving limiting groove. The hand crank base 22 is composed of a transmission component 221 with a gear disc 2211 and a helical gear 2212, a driving component 222 with a turbine 2221 and a connecting rod 2222, a hand crank 221 connected to the driving component 222 and the connecting rod 2222, and two lock housings 224 assembled together. The base 30 is an adjustable retractable leg, with two movable retaining rings 31 pivotally mounted on the lower end of the second bracket 2120 that can move up and down and two movable retractable legs. The frame 32, and the connecting rod 33 linking the two movable retaining rings 31 and the foot 32, together with the transmission component 221 of the hand crank 22 (with a toothed disc 2211 and helical gear 2212) and the drive component 222 (with a worm gear 2221 and connecting rod 2222) and the chain 2114 of the adjusting track 2111, form a chain-type lifting and adjusting device transmission mechanism. This ensures that the meshing teeth of the toothed disc 2211 of the transmission component 221 can reliably and securely mesh with the chain 2114 of the adjusting track 2111 through the guide channel 2131, thus stably controlling the height of the lifting rod 21. This prevents wear or tooth breakage caused by excessive rotational load during meshing, resulting in improved transmission efficiency and durability of the lifting control.The bicycle repair frame 100, utilizing the rotating bracket 12 and adjusting chuck 11 of the clamping device 10, allows for quick adjustment of the rotation angle and clamping positioning, enabling flexible adjustment of various positioning angles for bicycle frame maintenance. This provides a fully adjustable bicycle repair frame with omnidirectional rotation for maintenance.

[0033] The components of this utility model and their corresponding relationships are described in detail below:

[0034] The clamping device 10 includes an adjusting chuck 11 and a rotating bracket 12. The front end of the adjusting chuck 11 is provided with a clamping part 111 that can clamp up and down, and the rear end is provided with a quick-release handle 112 that can adjust the clamping tightness. It is used to clamp the bicycle seat post to equip the bicycle. The rotating bracket 12 is connected to the adjusting chuck 11 and moves synchronously. One end has a positioning ring sleeve 121 with two separable engaging male and female teeth, and the other end away from the adjusting chuck 11 has a control handle 122 that can pivot and lock in position. When the control handle 122 is pulled down, the positioning ring sleeve 121 closes and locks in position, keeping the rotating bracket 12 and the adjusting chuck 11 in position and not rotating. When the control handle 122 is pulled up, the male and female teeth of the positioning ring sleeve 121 separate and disengage, allowing the rotating bracket 12 and the adjusting chuck 11 to rotate freely, so that the bicycle can be freely adjusted for maintenance angle positioning.

[0035] In this embodiment, a connecting part 123 is provided below the rotating seat 12 of the clamping device 10 for pivotally connecting with the first bracket 211 of the lifting adjustment device 20, so that the clamping device 10 is pivotally connected to the top of the lifting rod 21.

[0036] The lifting and adjusting device is a chain-type lifting and adjusting device, which includes a lifting rod 21 and a hand crank base 22, wherein:

[0037] The lifting rod 21 includes two telescopic rods, first and second supports 211 and 212, which are compatible and extend to form inner and outer tubes facing each other, and a collar 213 abutting between the first and second supports 211 and 212. The first support 211 is a hollow tube 2110 with an inner tube. An adjusting track 2111 with a chain 2114 embedded in it is recessed on one longitudinal side of the tube wall of the first support 211, and a smooth groove 2112 with a corresponding longitudinal side is recessed on the opposite side. Furthermore, two opposing channels 2113 are respectively provided on the two longitudinal sides of the adjusting track 2111 that are perpendicular to each other along the longitudinal axis. The second support 212 is a hollow tube body 2120 in the shape of an outer tube. The top of the first support 211 has a flange 2121 with a smaller diameter step protruding upward, which is used to accommodate the second tube opening 2242 of the hand crank base 22 lock housing 224. The collar 213 is a hollow ring block, which is set in the first tube opening 2241 of the lock housing 24, and one end of the bottom is connected to the... The second bracket 212 flange 2121 abuts against the first bracket 211, and one end allows the first bracket 211 to pass through and extend. A guide channel 2131 is provided on the tube wall of the collar 213 corresponding to the longitudinal side of the adjustment track 2111 of the first bracket 211, so that the meshing part of the transmission component 221 of the hand crank 22 can be exposed and mesh with the chain 2114 of the adjustment track 2111. A spring piece 2132 is provided on the longitudinal side of the track groove 2112 of the first bracket 211. A positioning bolt 2247 with adjustable tightness is used to elastically abut against the first bracket 211 rail groove 2112 to form an auxiliary positioning function, and two ribs 2133 are respectively provided on the longitudinal side of the two grooves 2113 of the first bracket 211, so that the ribs 2133 of the collar 213 and the grooves 2113 of the first bracket 211 can be embedded in a limiting slide groove that can form a straight line movement, so as to limit the vertical linear displacement of the first bracket 211.

[0038] In this embodiment, the diameter of the collar 213 is larger than that of the first bracket 211 and is exactly opposite to the diameter of the flange 2121 of the second bracket 212. The collar 213 is used to accommodate the first tube opening 2241 of the lock shell 224 of the hand crank base 22. The upper end can be accommodated by the first bracket 211, and the lower end is accommodated to abut against the flange 2121 of the second bracket 212 in the second tube opening 2242 of the lock shell 224. It is used to pivotally connect the lifting rod 21 of the first and second brackets 211 and 212, which can be extended and retracted with the inner and outer tubes opposite each other.

[0039] In this embodiment, the lifting rod 21 further includes a pivot 23. One end of the pivot 23 is provided with a fitting part 231 that can be fitted with the top diameter of the first support 211 of the lifting rod 21, so that one end of the fitting part 231 is fixed to the top of the first support 211 of the lifting rod 21 of the lifting adjustment device 20. The other end is provided with a pivot ear 232 that is opposite to and pivotally connected to the joint part 123 of the rotating card seat 12. A pivot member 233 can be provided at the joint part 123 of the rotating card seat 12. The pivot member 233 can be provided as a quick-release shaft, so that the clamping device 10 can be in a longitudinal straight line, the tilt angle can be quickly adjusted, the device can be pivoted up and down to unfold or retract, and the device can be quickly positioned.

[0040] The hand crank base 22 includes a transmission component 221, a driving component 222, a hand crank 223, and two interlocking lock housings 224 for engaging with the chain 2114 of the adjusting track 2111 of the first support 211 of the lifting rod 21 to form a transmission mechanism. The transmission component 221 is equipped with a gear disc 2211 of a larger diameter and surrounded by a plurality of meshing teeth, which is connected to a helical gear 2212 of a smaller diameter. A positioning post 2213 is protruding from the center of one end of both the disc 2211 and the helical gear 2212. The drive component 222 has a worm gear 2221 of appropriate length on one side and a connecting rod 2222 of appropriate length extending from the other side and fitted with a bushing 2223. The hand crank 223 is mounted as a crank arm 2231. A grip portion 2232 is provided at one outer end of the crank arm 2231, and a positioning hole 22 is provided at one inner end of the grip portion 2232. 33 is connected to the connecting rod 2222 of the drive member 222. The lock shell 224 is a cover that can be separated and combined. It has locking holes 2240 on two opposite sides to cooperate with a number of locking components 50 for locking and positioning. On one side of the interior, two mating collars 213 and the flange 2121 of the second bracket 212 are respectively recessed to accommodate the first and second tube openings 2241 and 2242. On the other side, a gear opening 2243 and a worm gear opening 2244 are respectively provided to correspond to the shape of the transmission member 221 and the drive member 222. Two opposite grooves 2245 are respectively provided at the ribs 2133 on the corresponding longitudinal position of the tube wall of the collar 213, so that the collar 213 is accommodated in the first tube opening 2241 and the ribs 2133 are properly fitted and positioned in the grooves 2245. The flange 2121 of the second bracket 212 is accommodated in the second tube opening 2242 and abuts against the collar 213.

[0041] In this embodiment, the lock housing 224 is provided with an adjustment hole 2246 at the first tube opening 2241 corresponding to the spring piece 2131 of the collar 213. It is pivotally mounted with an adjustable positioning bolt 2247 to keep it in contact with the spring piece 2131. At the same time, it can provide elastic support and positioning for the first branch pipe 211 that extends through the collar 213. Meanwhile, the gear plate 2211 of the transmission component 221 is kept in stable engagement with the chain 2114 of the adjustment track 2111 on the opposite side through the guide hole 2131 of the collar 213, so that it does not deviate or loosen. This allows the first bracket 211 of the lifting rod 21 to extend in the collar 213 and the second bracket 212 and move up and down, so as to keep it in stable contact without shaking and prevent the lifting from jamming.

[0042] In this embodiment, the aforementioned positioning bolt 2247 is configured as an adjusting screw, with a top abutment and a pressure rod at the front and rear ends, respectively. This allows for the elastic support of the spring piece 2132 of the pressure ring 213 to maintain a tightness against the first bracket 211 of the lifting rod 21 to prevent loosening, and the pressure rod can be rotated to adjust the tightness of the positioning bolt 2247.

[0043] In this embodiment, the aforementioned collar 213 spring piece 2132 is correspondingly abutted against the first bracket 211 rail groove 2112 to form a limiting elastic abutment, and is pushed against the rail groove 2112 by the positioning bolt 2247, so that the vertical displacement force of the first bracket 211 can push the spring piece 2132 to maintain a tight elastic pressure positioning.

[0044] In this example, the aforementioned lifting rod further includes a base 30, which includes a movable retaining ring 31, a bipod 32, and a two-linkage rod 33. The movable retaining ring 31 is pivotally mounted on the second support 212 and can move up and down. One end of the bipod 32 is a fixed end, pivotally mounted on the lower end of the second support 212 for positioning, and the other end is a free end, which can be folded upwards and retracted. The linkage rod 33 is provided with a connecting pivot piece, and its two ends are respectively connected to the movable retaining ring 31 and the bipod 32 to form a linkage, which is used to pull the free end of the bipod 32 upwards and retract it, while driving the two-linkage rod 33 to retract upwards and push the movable retaining ring 31 downwards, so as to form a movable, adjustable, retractable, and upright base that is folded upwards and extended downwards for support.

[0045] like Figures 6-7As shown, in use, first, the clamping device 10 adjusts the clamping part 111 at the front end of the chuck 11, which can clamp up and down, to clamp the bicycle seat post (not shown in the figure). Then, the quick-release handle 112 at the rear end, which can adjust the clamping tightness, is used to secure the bicycle. The rotating chuck 12 can then be operated to control the handle 122, which in turn moves the positioning ring 122 to open and close, adjusting the positioning angle of the chuck 11. Pulling down the operating control handle 122 closes the positioning ring 121, locking it in place, keeping the rotating chuck 12 and the adjusting chuck 11 in position without rotation. Pulling up the operating control handle 122 separates the male and female teeth of the positioning ring 121, allowing the rotating chuck 12 and the adjusting chuck 11 to rotate freely, enabling the bicycle to be adjusted for maintenance. When adjusting the height of the lifting rod, simply hold the grip 2232 of the hand crank 223 and rotate it. This will cause the connecting rod 2222 to rotate in one direction, making the worm gear 2221 of the drive component 222 mesh with the connecting rod 2222, driving the helical gear 2312 and the gear disc 2211 to rotate. This will cause the meshing teeth to tightly engage with the adjusting track 2111 and the chain 2114, moving them up or down. In this example, when the hand crank 223 is rotated clockwise, the drive component 222 and the transmission component 221 will rotate in the same clockwise direction. The meshing teeth 2211 of the transmission component 221 will engage the adjusting track 2111 and the chain 2114, causing them to move upward. This will stretch the first support 211 of the lifting rod 21 upward, thus raising the lifting rod. When the hand crank 223 is rotated counterclockwise, it causes the drive component 222 and the transmission component 221 to rotate counterclockwise in the same direction. The teeth 2211 of the transmission component 221 engage the chain 2114 of the adjustment track 2111, causing it to climb downwards. This causes the first support 211 of the lifting rod 21 to retract downwards, lowering the lifting rod 21. The hand crank 223 of the hand crank base 22 then drives the drive component 222 to engage the gear 2211 of the transmission component 221 with the chain 2114 of the adjustment track 2111, forming a transmission mechanism for the chain-type lifting adjustment device 20. This ensures that the teeth 2211 of the transmission component 221 can reliably and securely engage with the chain 2114 of the adjustment track 2111, thus stably controlling the adjustment of the lifting rod 21. The height control, in addition to preventing wear or tooth breakage caused by excessive rotational load in the meshing transmission, allows for better transmission efficiency and durability. It can also effectively and stably control the lifting position of the lifting rod and ensure that the meshing part can stably engage in the chain 2114 for safer operation. It effectively improves the shortcomings of traditional telescopic tubes, which are prone to rapid slippage when adjusting the height under heavy loads. This results in better transmission efficiency and durability. Furthermore, the rotating bracket 12 and adjusting chuck 11 of the clamping device 10 can quickly adjust the rotation angle and clamping position for clamping the bicycle seat post, allowing the bicycle frame to be flexibly adjusted at various positioning angles for maintenance. Thus, the bicycle repair frame 100 presents a 360-degree rotating adjustment and maintenance angle.

[0046] like Figures 8-9 As shown, during operation, the hand crank 223 can be directly removed, and the power tool X can be directly connected to the tool end that matches the hexagonal prism end of the connecting rod 2222. This allows for quick adjustment of the lifting position of the lifting rod by rotating it forward or backward.

[0047] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A bicycle repair stand structure, characterized by include: A clamping device includes an adjusting chuck and a rotating base connected to the adjusting chuck. The front end of the adjusting chuck is provided with a clamping part that can clamp up and down, and the rear end is provided with a quick-release handle that can adjust the clamping tightness. One end of the rotating base has two positioning rings that can be separated and joined together to form male and female meshing parts, and the other end away from the adjusting chuck has a control handle that can be pivoted and locked for positioning. A lifting and adjusting device, comprising: A lifting boom, comprising: A first support is provided with an adjustment track with a chain embedded and a smooth groove recessed on a longitudinal side of the pipe wall, and two grooves recessed on a horizontal side of the pipe wall. A second support is attached to the top of the pipe wall and has a flange with a diameter larger than that of the first support, which is compatible with the first support. A ring is set between the first and second supports, and is in vertical contact with the flange tube wall of the first support. A guide hole and a spring are respectively provided on the tube wall of the corresponding longitudinal side of the adjustment track and the groove of the first support. Two ribs are respectively provided on the tube wall of the corresponding longitudinal side of the two grooves of the first support. A hand-cranked seat, including: A transmission component is provided with a toothed disc having several meshing teeth connected to a helical gear, and a positioning post is protruding from the center of one end of both the toothed disc and the helical gear; A drive component is connected to a connecting rod. A turbine is provided on one side of the connecting rod, which abuts and moves in conjunction with the helical gear of the transmission component. A bushing is sleeved on the end of the connecting rod away from the transmission component. A hand crank is configured as a crank arm. A grip is provided at one outer end of the crank arm, and a positioning part is provided at one inner end of the grip, which abuts against the drive component bushing and is connected to the end connecting rod. The two lock shells are two separable and combinable covers. The first and second tube sleeve openings are respectively recessed on one side of the interior, and two opposite grooves are respectively provided at the two ribs of the collar tube wall corresponding to the first tube sleeve opening. Gear sleeve openings and worm gear sleeve openings are respectively provided on the other two sides. The device utilizes the adjusting chuck's front clamping part to clamp the workpiece, and the rear quick-release handle can adjust the clamping tightness. The opening and closing control handle of the rotating chuck can be linked to the positioning ring to open and close, adjusting the chuck's positioning angle. The transmission mechanism of the chain-type lifting and adjusting device is formed by the cooperation of the hand-cranked base with a toothed disc and helical gear, and the drive component with a worm gear and connecting rod, and the chain of the adjusting track. This ensures that the chain of the adjusting track can reliably and securely mesh with the toothed part of the transmission component.

2. Bicycle repair stand structure according to claim 1, characterized in that The lifting rod further includes a pivot seat, one end of which is provided with a fitting part that can be fitted with the top diameter of the first support tube of the lifting rod, and the other end is provided with a pivot ear part that is opposite to the rotating card seat joint part, and a pivot member is provided at the joint part.

3. The bicycle repair stand structure of claim 1, wherein, The lifting rod further includes a base, which includes a movable retaining ring, two legs, and two connecting rods. The movable retaining ring is pivotally mounted on the second support and can move up and down. One end of the two legs is fixed and pivotally mounted on the lower end of the second support, and the other end is free. The connecting rod is a connecting pivot piece, and its two ends are connected to the movable retaining ring and the legs to form a linkage, so that the base is folded up and contracted, and unfolded and supported downward.

4. The bicycle repair rack structure according to claim 1, characterized in that, The first and second supports of the lifting rod are configured as telescopic rods that can accommodate each other and extend with inner and outer tubes facing each other.

5. A bicycle repair stand structure according to claim 4, characterised in that, The first support of the lifting rod is configured as an inner tube, and the second support is configured as an outer tube that can accommodate the first support and is opposite to the inner tube of the first support.

6. The bicycle repair stand structure of claim 1, wherein, The first sleeve opening of the lock case has an adjustment hole at the corresponding collar spring piece, which is fitted with a positioning bolt.

7. A bicycle repair stand structure according to claim 6, characterised in that, The positioning bolt pivotally mounted on the lock housing adjustment hole is configured as an adjustment screw, with a top abutment and a pressure rod at the front and rear ends, respectively. The top abutment can press against the spring sheet of the collar to maintain a tight elastic support against the first bracket of the lifting rod to prevent loosening, and the pressure rod can be rotated to adjust the tightness of the positioning bolt.

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