Bicycle frame convenient to adjust
By designing an adjustable bicycle frame, including car connection pipe, support pole, wheel duct, rotary fixing arm and adjustment arm, the problem of unreliable fixing effect of traditional bicycle frames is solved, and the bicycle is stable and convenient to adapt to different spaces is achieved.
Patent Information
- Application Number
- CN202422300183.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-09-20
AI Technical Summary
The fixing effect of traditional bicycle frames is not reliable and cannot be adjusted. When used in cars of different models, the space cannot be adjusted, which affects the placement and fixation of the bicycle.
A bicycle frame including a car connection pipe, a support bottom rod, a wheel duct, a rotary fixing arm and an adjustment arm is designed. It is fixed by adjustable wedges and clamping structures, and the support bottom rod can be adjusted angle. A ramp frame is installed on the wheel duct to facilitate the placement of the bicycle.
It realizes the stable and fixed bicycles, adapts to bicycles and car spaces of different sizes, is easy to use and store, and improves the convenience and stability of use.
Smart Images
Figure CN222988084U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of bicycle racks, and particularly relates to a bicycle rack that is convenient to adjust. Background Art
[0002] A bicycle rack is a device specifically used to fix a bicycle on an automobile or a means of transportation. It is usually made of metal or plastic and has sufficient strength and stability to ensure that the bicycle does not slide or tip over during transportation. Using a bicycle rack to fix a bicycle on an automobile can prevent the bicycle from swaying during driving, reduce the impact and damage to the vehicle, and also prevent the bicycle from being damaged or lost.
[0003] The fixing of traditional bicycle racks to bicycles is relatively simple. Generally, the front and rear wheels of the bicycle are respectively fixed on the consignment rack, and the bicycle is fixed to the consignment rack with straps or buckles. There is a lack of a special fixing structure, and the fixing effect is not reliable. After bumping and vibrating, it is easy to shift, which will further reduce the stability. Moreover, most ordinary bicycle racks are of a fixed structure, that is, they cannot be adjusted by themselves. When encountering automobiles of different models, the space between the rack and the automobile cannot be adjusted, which will affect the placement and fixing of the bicycle. If the space is too small and the bicycle is forcibly placed, it is very easy to cause scratches and abrasions on the surface of the automobile. Finally, when placing a bicycle on a traditional bicycle rack, the bicycle is lifted by manpower and placed in. When the bicycle is heavy, the height of the bicycle rack after installation is high, and the space is relatively narrow, etc., the traditional method is particularly inconvenient. Content of the Utility Model
[0004] The main purpose of the utility model is to provide a bicycle rack that is convenient to adjust, which can effectively solve the problems mentioned in the background art.
[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0006] A bicycle rack that is convenient to adjust includes an automobile connecting pipe. One end of the automobile connecting pipe is connected to an automobile tow hitch, and the other end is installed with a frame for placing a bicycle. The frame includes a support bottom rod. The support bottom rod is rotatably connected to the automobile connecting pipe and is fixed through an internal clamping structure. An adjustable wedge block is installed inside the automobile connecting pipe to abut against the connecting square opening of the automobile tow hitch. Above the support bottom rod, a pair of wheel holding pipes are fixedly installed in parallel through two pairs of mounting blocks. A rotating fixing arm for clamping a bicycle wheel is rotatably connected to each end of the wheel holding pipe. An adjusting block is movably installed at the top of the rotating fixing arm. The adjusting block slides up and down along the rotating fixing arm to fix the bicycle wheel. An adjusting arm is also installed between the rotating fixing arm and the wheel holding pipe to adjust and fix the angle of the rotating fixing arm relative to the wheel holding pipe.
[0007] Preferably, one end of the automobile connecting pipe is connected to the automobile trailer by a bolt, and the other end of the automobile connecting pipe is provided with a hand handle, and the hand handle is fixedly connected to a rotating rod, and the rotating rod extends into the interior of the automobile connecting pipe and is threadedly connected to the end of the automobile connecting pipe, and the other end of the rotating rod is limitedly connected to a driving block, and an adjustment groove is opened on the surface of the driving block, and the driving block is fitted with a wedge block through the adjustment groove. The wedge block is rotatably connected to the inner wall of the automobile connecting pipe through an axle pin, and its top protrudes from the surface of the automobile connecting pipe to be inserted into the square opening of the automobile trailer connection, and its bottom fits into the adjustment groove.
[0008] Preferably, a connecting shell is fixedly installed at the tail of the supporting bottom rod, a connecting base is sleeved in the connecting shell, the connecting base and the connecting shell are rotationally connected through a central connecting shaft, and the bottom of the connecting base is fixedly connected to the automobile connecting pipe.
[0009] Preferably, a handle is installed on the head of the supporting bottom rod, and a pull handle is connected to the internal limit of the handle, and the pull handle is fixedly connected to a pull rod. The pull rod passes through the handle and extends into the interior of the supporting bottom rod, and a slider is fixedly connected at the end, and the slider can slide along the bottom slide groove of the supporting bottom rod.
[0010] Preferably, the bottom of the slider is fixedly connected to a connecting block outside the supporting bottom rod by means of a slide groove, one end of the connecting block is fixedly connected to a limit rod, the end of the limit rod is fixedly connected to a limit block, the limit rod passes through the shell body of the connecting shell, and a limit spring is mounted on the limit rod and is stuck inside the shell body of the connecting shell.
[0011] Preferably, the upper end of the connecting base is arc-shaped and has a plurality of limiting grooves, and the limiting block connected to the end of the limiting rod can just fit into the limiting groove.
[0012] Preferably, the rotating fixed arm is in an inverted U-shape, and a number of insertion holes are evenly opened in the straight section of the rotating fixed arm, the two sides of the adjusting block are stuck inside the U-shaped structure, and a pair of squeezing handles are movably installed on the back of the limit block, and the squeezing handles are respectively connected to an insertion rod inside the adjusting block by a spring structure, and the insertion rod can be inserted into the corresponding insertion hole.
[0013] Preferably, the adjusting arm comprises a snap-fit fixture and an arm rod, the side surface of the snap-fit fixture is fixedly connected to the wheel tube and can rotate, one end of the arm rod is inserted into the snap-fit fixture, and the other end is rotatably connected to the rotating fixed arm.
[0014] Preferably, a rack is embedded at the bottom of the arm rod, and a button is movably installed inside the clamping fixator below the arm rod. The button is rotationally connected to the clamping fixator through a pin structure, and an integral clamping tooth is provided at the end of the button. The bottom of the clamping tooth is resisted by a return spring to engage with the rack.
[0015] Preferably, one end of the wheel custody tube is also movably connected to a ramp frame, which is composed of three concave panels. A connecting groove is formed at the bottom surface of the concave panel, and the concave panels are overlapped with each other and locked and fixed through a knob bolt at the connecting groove. A connecting head is provided at the end of one of the concave panels and is inserted and connected to the wheel custody tube through the connecting head.
[0016] Compared with the prior art, the utility model has the following beneficial effects:
[0017] In the utility model, firstly, inverted U-shaped rotating fixing arms are added at both ends of the wheel custody tube to clamp the bicycle wheel, and a slidable adjusting block is installed on the rotating fixing arm to facilitate adapting to wheels of different sizes. In addition, an adjusting arm is added between the rotating fixing arm and the wheel custody tube, and the angle between the rotating fixing arm and the wheel custody tube is adjusted by using the clamping tooth and rack structure to facilitate clamping bicycles of different sizes in all directions. Secondly, a supporting inclined structure is arranged on the supporting bottom rod to adjust the included angle between the supporting bottom rod and the vehicle connecting pipe, so as to adjust the inclination angle of the supporting bottom rod, facilitate obtaining a suitable space and enable the whole supporting bottom rod to be turned over and stored (here, the inclined structure has three states: 1. folded up upward without installing a bicycle; 2. in a flat state when installing a bicycle, which is the normal use state; 3. inclined downward and folded, which is convenient for opening the trunk after installing a bicycle). Finally, in order to facilitate putting the bicycle on the wheel custody tube, a ramp frame is additionally installed on the wheel custody tube to facilitate easily pushing the bicycle up. In addition, a jacking and locking structure is added between the vehicle connecting pipe and the vehicle trailer, and the connection stability is further enhanced by using a wedge block. Description of the Drawings
[0018] Figure 1 is a schematic diagram of the overall structure of the utility model;
[0019] Figure 2 is a schematic diagram of the internal structure of the supporting bottom rod of the utility model;
[0020] Figure 3 is a schematic diagram of the internal structure of the vehicle connecting pipe of the utility model;
[0021] Figure 4 is a schematic diagram of the structure of the adjusting arm of the utility model;
[0022] Figure 5Schematic diagram of the installation structure of the adjusting block of the present utility model;
[0023] Figure 6 Schematic diagram of the ramp frame structure of the present utility model.
[0024] In the figure: 1, vehicle connection pipe; 2, support bottom rod; 3, wheel support tube; 4, rotary fixing arm; 5, adjusting arm; 6, adjusting block; 7, ramp frame; 8, mounting block; 9, handle; 10, pull handle; 11, pull rod; 12, slider; 13, connection block; 14, limit rod; 15, limit spring; 16, limit block; 17, connection housing; 18, connection base; 19, limit groove; 20, connection shaft; 21, hand-tightening handle; 22, rotating rod; 23, driving block; 24, wedge block; 25, adjusting groove; 26, clamping fixture; 27, arm rod; 28, rack; 29, button; 30, engaging tooth; 31, return spring; 32, extrusion handle; 33, inserting rod; 34, inserting hole; 35, concave panel; 36, connection groove; 37, knob bolt; 38, connection head. Detailed implementation manners
[0025] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with the detailed implementation manners.
[0026] As Figure 1 shown, a bicycle rack that is convenient to adjust includes a vehicle connection pipe 1. One end of the vehicle connection pipe 1 is connected to the vehicle trailer hitch, and the other end is installed with a frame for placing a bicycle. The frame includes a support bottom rod 2. The support bottom rod 2 is rotatably connected to the vehicle connection pipe 1 and is fixed through an internal clamping structure. An adjustable wedge block 24 is installed inside the vehicle connection pipe 1 for abutting against the vehicle trailer connection square opening. Above the support bottom rod 2, a pair of wheel support tubes 3 are fixedly installed in parallel through two pairs of mounting blocks 8. Rotating fixing arms 4 for clamping the bicycle wheels are respectively rotatably connected to both ends of the wheel support tubes 3. An adjusting block 6 is movably installed at the top of the rotating fixing arm 4. The adjusting block 6 slides up and down along the rotating fixing arm 4 for fixing the bicycle wheel. An adjusting arm 5 is also installed and connected between the rotating fixing arm 4 and the wheel support tube 3 for adjusting and fixing the angle between the rotating fixing arm 4 and the wheel support tube 3.
[0027] In order to further enhance the connection stability between the vehicle connection pipe 1 and the vehicle trailer, as Figure 3As shown, one end of the vehicle connecting pipe 1 is connected to the vehicle trailer through a bolt. At the same time, a hand-twisting handle 21 is provided at the other end of the vehicle connecting pipe 1. The hand-twisting handle 21 is fixedly connected to a rotating rod 22. The rotating rod 22 extends into the interior of the vehicle connecting pipe 1 and is threadedly connected to the end of the vehicle connecting pipe 1. The other end of the rotating rod 22 is limitedly connected to a driving block 23. An adjusting groove 25 is formed on the surface of the driving block 23 and is fitted and connected to a wedge block 24 through the adjusting groove 25. The wedge block 24 is rotatably connected to the inner wall of the vehicle connecting pipe 1 through a pin. Its top protrudes from the surface of the vehicle connecting pipe 1 to be inserted into the square opening of the vehicle trailer connection, and its bottom is fitted and abutted against the adjusting groove 25.
[0028] In order to realize the angle adjustment between the support bottom rod 2 and the vehicle connecting pipe 1 and obtain a larger placement space for the support bottom rod 2, as Figure 2 shown, a connection housing 17 is fixedly installed at the tail of the support bottom rod 2. A connection base 18 is sleeved inside the connection housing 17. The connection base 18 and the connection housing 17 are rotatably connected through a central connection shaft 20. The bottom of the connection base 18 is fixedly connected to the vehicle connecting pipe 1. A handle 9 is installed at the head of the support bottom rod 2. A pull handle 10 is limitedly connected inside the handle 9. The pull handle 10 is fixedly connected to a pull rod 11. The pull rod 11 passes through the handle 9 and extends into the interior of the support bottom rod 2 and is fixedly connected to a slider 12 at the end. The slider 12 can slide along the bottom chute of the support bottom rod 2. The bottom of the slider 12 is fixedly connected to a connection block 13 outside the support bottom rod 2 by using the chute. One end of the connection block 13 is fixedly connected to a limit rod 14. A limit block 16 is fixedly connected to the end of the limit rod 14. The limit rod 14 passes through the body of the connection housing 17, and a limit spring 15 is sleeved on the limit rod 14 and is stuck inside the body of the connection housing 17. The upper end of the connection base 18 is arc-shaped and is provided with a plurality of limit grooves 19. The limit block 16 connected to the end of the limit rod 14 can just be inserted into the limit grooves 19.
[0029] In order to better fix the wheels, as Figure 1 and Figure 5 shown, the rotary fixing arm 4 is in an inverted U shape, and a plurality of insertion holes 34 are evenly formed in the straight section of the rotary fixing arm 4. Both sides of the adjusting block 6 are stuck inside the U-shaped structure, and a pair of extrusion handles 32 are movably installed on the back of the limit block 16. The extrusion handles 32 are respectively connected to a plug rod 33 by a spring structure inside the adjusting block 6. The plug rod 33 can be correspondingly inserted into the insertion holes 34.
[0030] At the same time, in order to facilitate the rotary fixing arm 4 to fix bicycles of different sizes, as Figure 4As shown, the adjusting arm 5 includes two parts: a clamping fixture 26 and an arm rod 27. The side of the clamping fixture 26 is fixedly connected to the wheel carrier 3 and can rotate. One end of the arm rod 27 is inserted into the clamping fixture 26, and the other end is rotatably connected to the rotating fixed arm 4. A rack 28 is embedded at the bottom of the arm rod 27. Inside the clamping fixture 26, below the arm rod 27, a button 29 is movably installed. The button 29 is rotatably connected to the clamping fixture 26 through a pin structure, and an integral clamping tooth 30 is provided at the end of the button 29. The bottom of the clamping tooth 30 is resisted by a return spring 31, so as to engage with the rack 28.
[0031] To easily place the bicycle on the wheel carrier 3, as Figure 1 and Figure 6 shown, one end of the wheel carrier 3 is also movably connected to a ramp frame 7. The ramp frame 7 is composed of three concave panels 35. A connecting groove 36 is opened at the bottom surface of the concave panel 35. The concave panels 35 are stacked on each other and are locked and fixed at the connecting groove 36 through a knob bolt 37. A connecting head 38 is provided at the end of one of the concave panels 35 and is inserted and connected to the wheel carrier 3 through the connecting head 38.
[0032] In actual use, first insert the vehicle connecting pipe 1 into the towing structure of the vehicle and lock it with bolts. Then rotate the hand crank 21, use the threaded connection structure to push the rotating rod 22 inward, so as to drive the driving block 23 to slide inward. Since the bottom of the wedge block 24 fits into the adjusting groove 25 on the driving block 23, and the wedge block 24 itself is rotatably connected inside the vehicle connecting pipe 1, the wedge block 24 will be driven to rotate, so that the top turns out of the surface of the vehicle connecting pipe 1 and is clamped into the vehicle towing connection square opening, finally achieving the tensioning effect and improving the installation stability of the vehicle connecting pipe 1.
[0033] Then, according to the different structures of the rear of the car and the size of the space, the angle of the supporting bottom bar 2 and the car connecting pipe 1 is adjusted. Since the car connecting pipe 1 is fixed after installation, if the angle between the two is increased, the supporting bottom bar 2 and the wheel hosting 3 will be turned down to expand the placement space above, and if the angle between the two is reduced, the supporting bottom bar 2 and the wheel hosting 3 will be turned up to reduce the placement space above. The user can adjust according to the actual situation; and the specific adjustment method is: pull the handle 10 outward by hand, drive the slider 12 to slide outward through the pull rod 11, thereby drive the connecting block 13 and the limit rod 14 to move outward, and then drive the limit rod 1 The limit block 16 at the end of 4 is separated from the limit groove 19. At this time, there is only one centrally connected connecting shaft 20 between the connecting shell 17 and the connecting base 18. Therefore, the supporting bottom rod 2 connected to the connecting shell 17 and the automobile connecting pipe 1 connected to the connecting base 18 can rotate relative to each other, and the automobile connecting pipe 1 is fixed, so the supporting bottom rod 2 can be rotated to adjust the appropriate angle, and then the handle 10 is released. Under the action of the limit spring 15, the limit rod 14 and the limit block 16 are reset to the center and snapped into the limit groove 19, thereby limiting the connection between the connecting shell 17 and the connecting base 18 and completing the fixation after adjustment.
[0034] When placing the bicycle, it is necessary to first pull out the arm 27 on one side from the snap-fit fixture 26 so that the rotatable fixing arm 4 is completely flipped over to the bottom of the wheel tube 3. At this time, the assembled ramp frame 7 is connected to the end of the wheel tube 3, and the bicycle can be easily pushed onto the wheel tube 3 along the ramp frame 7 until the front wheel is against the rotatable fixing arm 4 at the other end; then, the previously flipped rotatable fixing arm 4 is flipped up, and the arm 27 is reinserted into the snap-fit fixture 26. Due to the setting of the angles of the rack 28 and the latching teeth 30, the arm 27 can be easily inserted into the latching fixture 26 without being blocked, that is, the rotatable fixing arm 4 will not be affected when flipping up, and when flipping the rotatable fixing arm 4 downward, the structure of the rack 28 and the latching teeth 30 is similar to the ratchet pawl structure, and the button 29 needs to be pressed by hand to make the latching teeth 30 is disengaged from the meshing of the rack 28 to ensure that the arm 27 can slide in the clamping fixture 26; in this way, the angle of the rotating fixing arm 4 can be adjusted, which is convenient for clamping and fixing bicycles of different sizes; at the same time, in order to facilitate the handling of bicycle wheels of different sizes, an adjusting block 6 is also installed on each rotating fixing arm 4, and the two sides of the adjusting block 6 are clamped in the rotating fixing arm 4. The squeezing handle 32 is pinched by hand to contract the spring inside the adjusting block 6 and retract the insertion rod 33 at the same time, so that the adjusting block 6 can slide up and down along the rotating fixing arm 4, which is convenient for the top of the rotating fixing arm 4 to clamp wheels of different sizes. After adjusting to the appropriate position, it is only necessary to release the squeezing handle 32, and under the action of the spring inside the adjusting block 6, the insertion rod 33 is pushed out again and inserted into the socket 34 on the rotating fixing arm 4 for fixing.
[0035] As for the ramp frame 7 after use, it can be removed. Since the ramp frame 7 is assembled by stacking three concave panels 35, the concave structure is to facilitate the walking of the bicycle without slipping. After stacking the three concave panels 35 in sequence, the unified connecting groove 36 in the middle of the three is used to cooperate with the knob bolt 37 to complete the fixation. The length of the ramp frame 7 can be fixed when stacking and placing, or the knob bolt 37 can be loosened for adjustment after assembly. After use, the ramp frame 7 can be disassembled and stored for the next use.
[0036] The above process is the process of using the bicycle rack. When removing the bicycle and disassembling the bicycle rack, just reverse the above steps, and this embodiment will not be elaborated too much.
[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.
Claims
1. A conveniently adjustable bicycle rack, comprising a car connecting pipe (1), one end of the car connecting pipe (1) is connected to a car trailer, and the other end is mounted on a bicycle frame, characterized in that: The frame comprises a supporting bottom bar (2), the supporting bottom bar (2) is rotatably connected to a car connecting pipe (1) and fixed by an internal clamping structure, an adjustable wedge (24) is installed inside the car connecting pipe (1) for abutting against the car trailer connecting square mouth, a pair of wheel tubes (3) are fixedly installed in parallel above the supporting bottom bar (2) through two pairs of mounting blocks (8), the two ends of the wheel tubes (3) are respectively rotatably connected to a rotating fixed arm (4) for clamping a bicycle wheel, an adjusting block (6) is movably installed on the top of the rotating fixed arm (4), the adjusting block (6) slides up and down along the rotating fixed arm (4) for fixing the bicycle wheel, and an adjusting arm (5) is additionally installed and connected between the rotating fixed arm (4) and the wheel tube (3) for adjusting and fixing the angle of the rotating fixed arm (4) relative to the wheel tube (3).
2. The conveniently adjustable bicycle rack according to claim 1, characterized in that: One end of the automobile connecting pipe (1) is connected to the automobile trailer via a bolt, and the other end of the automobile connecting pipe (1) is provided with a hand twist handle (21), and the hand twist handle (21) is fixedly connected to a rotating rod (22), and the rotating rod (22) extends into the interior of the automobile connecting pipe (1) and is threadedly connected to the end of the automobile connecting pipe (1). The other end of the rotating rod (22) is limitedly connected to a driving block (23), and an adjusting groove (25) is provided on the surface of the driving block (23), and the driving block (23) is connected to the wedge block (24) through the adjusting groove (25). The wedge block (24) is rotatably connected to the inner wall of the automobile connecting pipe (1) through an axle pin, and its top protrudes from the surface of the automobile connecting pipe (1) to be clamped into the automobile trailer connection square port, and its bottom is fitted into the adjusting groove (25).
3. The conveniently adjustable bicycle rack according to claim 2, characterized in that: A connecting shell (17) is fixedly mounted on the rear end of the supporting bottom rod (2), a connecting base (18) is mounted inside the connecting shell (17), the connecting base (18) and the connecting shell (17) are rotatably connected via a central connecting shaft (20), and the bottom of the connecting base (18) is fixedly connected to the automobile connecting pipe (1).
4. The conveniently adjustable bicycle rack according to claim 3, characterized in that: A handle (9) is installed at the head of the supporting bottom rod (2), and a pull handle (10) is connected to the internal limit of the handle (9). The pull handle (10) is fixedly connected to a pull rod (11). The pull rod (11) passes through the handle (9) and extends into the interior of the supporting bottom rod (2), and a slider (12) is fixedly connected at the end. The slider (12) can slide along the bottom slide groove of the supporting bottom rod (2).
5. The conveniently adjustable bicycle rack according to claim 4, characterized in that: The bottom of the slider (12) is fixedly connected to a connecting block (13) outside the supporting bottom rod (2) by means of a sliding groove, one end of the connecting block (13) is fixedly connected to a limiting rod (14), the end of the limiting rod (14) is fixedly connected to a limiting block (16), the limiting rod (14) passes through the shell body of the connecting shell (17), and a limiting spring (15) is mounted on the limiting rod (14) and is clamped inside the shell body of the connecting shell (17).
6. The conveniently adjustable bicycle rack according to claim 5, characterized in that: The upper end of the connecting base (18) is arc-shaped and is provided with a plurality of limiting grooves (19), and the limiting block (16) connected to the end of the limiting rod (14) can just fit into the limiting groove (19).
7. The conveniently adjustable bicycle rack according to claim 1, characterized in that: The rotating fixed arm (4) is in an inverted U-shape, and a plurality of insertion holes (34) are evenly provided on the straight section of the rotating fixed arm (4). The two sides of the adjusting block (6) are stuck inside the U-shaped structure, and a pair of squeezing handles (32) are movably installed on the back of the limit block (16). The squeezing handles (32) are respectively connected to an insertion rod (33) inside the adjusting block (6) by means of a spring structure, and the insertion rod (33) can be correspondingly inserted into the insertion holes (34).
8. The conveniently adjustable bicycle rack according to claim 1, characterized in that: The regulating arm (5) comprises a snap-fit fixture (26) and an arm rod (27). The side surface of the snap-fit fixture (26) is fixedly connected to the wheel tube (3) and can rotate. One end of the arm rod (27) is inserted into the snap-fit fixture (26), and the other end is rotatably connected to the rotating fixed arm (4).
9. The conveniently adjustable bicycle rack according to claim 8, characterized in that: A rack (28) is embedded at the bottom of the arm (27), and a button (29) is movably installed inside the clamping fixture (26) below the arm (27). The button (29) is rotatably connected to the clamping fixture (26) through an axle pin structure, and an integrated clamping tooth (30) is provided at the end of the button (29). The bottom of the clamping tooth (30) is supported by a return spring (31) so as to mesh with the rack (28).
10. The conveniently adjustable bicycle rack according to claim 1, characterized in that: One end of the wheel tube support (3) is also movably connected to a ramp frame (7), and the ramp frame (7) is composed of three concave panels (35). The bottom surface of the concave panel (35) is provided with a connecting groove (36). The concave panels (35) are overlapped with each other and are locked and fixed at the connecting groove (36) by a knob bolt (37). The end of one of the concave panels (35) is also provided with a connecting head (38), which is plugged and connected to the wheel tube support (3) through the connecting head (38).