Turnover type mounting base assembly of vehicle-mounted bicycle frame

Abstract

The overturning type mounting base assembly of the vehicle-mounted bicycle frame comprises a mounting base and a mounting inserting pipe, limiting plates are vertically mounted on the two sides of one end of the mounting inserting pipe, and at least two clamping grooves are formed in the edge of each limiting plate in the circumferential direction. The mounting base is located above the limiting plates, the lower end of the mounting base is connected with a turnover connecting block, the turnover connecting block extends between the two limiting plates, side plates are vertically mounted on the two sides of the lower portion of the mounting base, a turnover shaft transversely penetrating through the limiting plates and the side plates is arranged in the middle of the turnover connecting block, and a swing clamping block is mounted on the upper portion of the turnover connecting block; one end of the swing clamping block is used for being connected with the clamping groove in a clamped mode, a gear operating rod axially connected with the clamping block rotating shaft is installed on the outer side of the side plate on any side, a positioning movable pin is arranged on the gear operating rod in a penetrating mode, and a movable pin driving assembly is installed on the positioning movable pin. The turnover type mounting base can solve the problems that an existing turnover type mounting base is insufficient in strength and has no safety locking structure.

Description

Technical Field

[0001] This utility model relates to the field of bicycle frame technology for automobiles, specifically a flip-type mounting base assembly for a vehicle-mounted bicycle frame. Background Technology

[0002] With the increasing number of outdoor cycling enthusiasts, people need to install bicycle racks on various vehicles. Current bicycle racks generally include roof racks and rear racks. For racks installed on the rear of a car, the mounting base and bicycle seat need to be flipped to a vertical position when not in use to reduce the rack's length. Existing flip-mounted bicycle racks have two problems: First, the connection structure between the mounting base and the mounting cable is not strong enough, making it unstable during the flipping process and prone to shaking and noise while the car is in motion. Second, when the mounting base is in a horizontal or vertical position, the gear shift lever can be accidentally activated, unlocking the rack and potentially causing a safety hazard. Utility Model Content

[0003] This utility model provides a flip-type mounting base assembly for a vehicle-mounted bicycle rack, which can solve the problems of insufficient strength and lack of safety locking structure in existing flip-type mounting bases.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a flip-type mounting base assembly for a bicycle rack, comprising a mounting base and a mounting connector. Limiting plates are vertically mounted on both sides of one end of the mounting connector. At least two snap-fit ​​grooves are provided along the circumferential edge of each limiting plate. The mounting base is located above the limiting plates, and a flip-connecting block is connected to its lower end. The flip-connecting block extends between the two limiting plates. Side plates are vertically mounted on both sides of the lower part of the mounting base. A flip-connecting block has a flip shaft that passes laterally through the limiting plates and side plates in its middle. A swinging block is mounted on the upper part of the flip-connecting block. One end of the swinging block engages with the snap-fit ​​groove, and the other end of the swinging block has a locking mechanism connected to the side plate. A gear shifting lever, axially connected to the pivot shaft, is mounted on the outer side of the side plate on either side of the shaft. A positioning pin passes through the gear shifting lever, and a pin drive assembly is mounted on the positioning pin. The pin drive assembly controls the positioning pin to extend into the corresponding positioning hole on the side plate when the swing block engages with the locking groove, and to disengage the positioning pin from the positioning hole when the swing block needs to disengage from the locking groove. By setting the positioning pin and the pin drive assembly, the gear shifting lever can be locked and limited to prevent it from rotating in the locked and limited state, ensuring that the mounting base remains locked. A flip-connecting block can be set as a support for flipping the mounting base. The flip-connecting block is in close contact with the limiting plate to reduce the vibration of the mounting base.

[0005] Preferably, a torsion spring is installed on the pivot shaft of the swing block. One end of the torsion spring is connected to the flip connecting block, and the other end of the torsion spring presses the swing block into the locking groove. The torsion spring can improve the safety of the swing block after it is locked into the locking groove.

[0006] Preferably, the movable pin drive assembly includes a base connected to the gear shift lever. The positioning movable pin is axially movable and installed inside the end of the base facing the side plate. An elastic element connected to the positioning movable pin is installed inside the base. A knob sleeve is fitted onto the outward end of the base. An inner sleeve is provided inside one end of the knob sleeve. A connecting screw that passes through the base and connects to the positioning movable pin is axially arranged at the center of the inner sleeve. The knob sleeve and the inner sleeve are screw-fitted or bevel-fitted. When the knob sleeve is rotated, it drives the inner sleeve to move axially, pulling the positioning movable pin out of the base or retracting it into the base. The axial movement of the positioning movable pin can be achieved by rotating the knob sleeve, which is convenient to operate.

[0007] Preferably, the outward-facing end of the base is inserted into the inner sleeve, and the inner sleeve and the base are fitted together by an axial rib structure to prevent rotation. The axial rib structure can prevent the inner sleeve from rotating and can only move axially.

[0008] Preferably, the inner sleeve has at least one wedge-shaped groove on its outer side wall, and the knob sleeve has a protrusion embedded in the corresponding wedge-shaped groove inside. When the protrusion moves to the lowest end of the wedge-shaped groove, the inner sleeve pulls the positioning pin back into the base. The wedge-shaped groove and the protrusion are reliably matched and will not disengage.

[0009] Preferably, a protrusion positioning groove is provided on the side of the wedge-shaped groove near the lowest end. When the protrusion is engaged in the protrusion positioning groove, the positioning movable pin remains in the base. The rotation of the knob sleeve can be positioned by the interlocking of the protrusion and the protrusion positioning groove, so that the positioning movable pin remains in the base. At this time, the gear operating lever can rotate freely, so that the flip connecting block can rotate around the limiting plate.

[0010] Preferably, the base has a mounting extension plate that extends radially to one side on its side wall. The mounting extension plate is equipped with fixing screws for connecting to the gear shift lever, which can easily fix the movable pin drive assembly to the gear shift lever and facilitate disassembly and assembly.

[0011] Preferably, the end of the mounting connector away from the limiting plate is equipped with a positioning block that passes through the side wall of the mounting connector. When the mounting connector is inserted into the corresponding mounting tube at the rear of the vehicle, the positioning block engages with the corresponding positioning groove inside the mounting tube. A movable block is installed inside the mounting connector, and the movable block and the mounting connector are anti-rotationally fitted. The movable block has an inclined surface on the side facing the positioning block, and a steel ball is placed between the inclined surface and the positioning block. A screw is also horizontally arranged inside the mounting connector. The first end of the screw is threaded to the movable block, and the second end extends to the first end of the mounting connector and is connected to a knob. The positioning block can be positioned with the mounting tube at the rear of the vehicle by extending and retracting relative to the side wall of the mounting connector. The extension and retraction of the positioning block is controlled by the rotation of the screw and the knob. The combination of the inclined surface and the steel ball allows the positioning block to extend and retract and remain locked, making operation simple and installation secure.

[0012] Furthermore, the movable block has a guide slot along its length, and a shaft is inserted horizontally through the guide slot on the side wall of the mounting connector, which can guide and limit the movement of the movable block and prevent the movable block from detaching from the screw.

[0013] Furthermore, a through groove is provided in the middle of the movable block, and openings corresponding to the through groove are provided on the two side walls of the mounting connector. Traditional fixing pins can pass through the through groove and the openings, since the positioning top block has already played a limiting and locking role.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] (1) By setting a positioning pin and a pin drive assembly, the gear shift lever can be locked and limited to prevent it from rotating in the locked and limited state, thus ensuring that the mounting base remains in the locked state and ensuring the safety of the mounting base.

[0016] (2) By setting a flip connecting block, the mounting base can be supported to flip. The flip connecting block and the limit plate are in close contact, which can reduce the shaking of the mounting base and improve the overall strength of the mounting base.

[0017] (3) The positioning top block can be positioned with the mounting tube at the rear of the vehicle by extending and retracting relative to the side wall of the mounting tube. The extension and retraction of the positioning top block is controlled by the rotation of the screw and the knob. The rotation of the screw can move the movable block. Thus, the combination of the inclined surface and the steel ball can make the positioning top block extend and retract and keep locked. The operation is simple and the installation is firm, which can improve the efficiency of disassembly and assembly of the bicycle frame. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a front sectional view of the present invention;

[0020] Figure 3 for Figure 2 AA-direction sectional view of the structure;

[0021] Figure 4 This is a three-dimensional structural diagram of the internal structure of the mounting connector of this utility model.

[0022] Figure 5 This is a partial three-dimensional structural diagram of the present invention;

[0023] Figure 6 This is a front view structural diagram of the gear shift lever of this utility model;

[0024] Figure 7 for Figure 6 BB-direction sectional view of the structure;

[0025] Figure 8 for Figure 7 Enlarged structural diagram at point A;

[0026] Figure 9 This is a partial three-dimensional view of the movable pin drive assembly of this utility model;

[0027] Figure 10 This is a three-dimensional structural diagram of the knob sleeve of this utility model;

[0028] Figure 11 This is a three-dimensional structural diagram of the inner sleeve of this utility model.

[0029] Figure label:

[0030] 1. Installation connector; 12. Installation base; 2. Limiting plate; 3. Snap-fit ​​groove; 4. Swinging block; 41. Block pivot; 5. Torsion spring; 6. Gear control lever; 7. Flip connecting block; 8. Flip shaft; 9. Side plate; 10. Movable pin drive assembly; 101. Knob sleeve; 102. Inner sleeve; 104. Base; 105. Elastic element; 106. Positioning movable pin; 107. Wedge groove; 108. 109. Protrusion positioning groove; 110. Mounting extension plate; 111. Fixing screw; 112. Protrusion; 113. Axial rib structure; 24. Screw; 25. End cap; 26. Knob; 27. Movable block; 28. Positioning top block; 29. ​​Guide sleeve; 200. Guide elongated hole; 2010. Insert shaft; 211. Through groove; 212. Beveled part; 213. Steel ball; 214. Opening part; 215. Reinforcing groove. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0032] like Figure 1-11As shown, this utility model provides the following technical solution to solve the problems of insufficient strength and lack of safety locking structure in existing flip-type mounting bases: A flip-type mounting base assembly for a bicycle rack includes a mounting base 12 and a mounting connector 1. Limiting plates 2 are vertically mounted on both sides of one end of the mounting connector 1. At least two snap-fit ​​grooves 3 are provided along the circumferential edge of the limiting plates 2. The mounting base 12 is located above the limiting plates 2, and a flip-connecting block 7 is connected to its lower end. The flip-connecting block 7 extends between the two limiting plates 2. Side plates 9 are vertically mounted on both sides of the lower part of the mounting base 12. A flip-type shaft 8 is provided in the middle of the flip-connecting block 7, passing laterally through the limiting plates 2 and the side plates 9. A swinging locking block 4 is mounted on the upper part of the flip-connecting block 7. One end of the swinging locking block 4 is used to engage with the snap-fit ​​groove 3, and the other end of the swinging locking block 4 is connected to the side plate 9. The locking block shaft 41 has a gear position operating lever 6 axially connected to the side plate 9 on either side. A positioning movable pin 106 passes through the gear position operating lever 6. A movable pin drive assembly 10 is installed on the positioning movable pin 106. The movable pin drive assembly 10 controls the positioning movable pin 106 to extend into the corresponding positioning hole on the side plate 9 when the swinging block 4 engages with the locking groove 3, and to disengage the positioning movable pin 106 from the positioning hole when the swinging block 4 needs to disengage from the locking groove 3. By setting the positioning movable pin 106 and the movable pin drive assembly 10, the gear position operating lever 6 can be locked and limited to prevent it from rotating in the locked and limited state, ensuring that the mounting base 12 remains in the locked state. The flip connecting block 7 can serve as a support for the flipping of the mounting base 12. The flip connecting block 7 is in close contact with the limiting plate 2 to reduce the vibration of the mounting base 12.

[0033] Specifically, the limiting plate 2 is installed on both sides of one end of the mounting tube 1 by rivets. Two locking grooves 3 are arranged circumferentially on the upper part of the limiting plate 2. One locking groove 3 engages with the locking block at the end of the swing locking block 4, corresponding to a horizontal position for the mounting base 12. When the other locking groove 3 engages with the locking block at the end of the swing locking block 4, the mounting base 12 is in a vertical position. At least one bicycle mounting bracket can be installed on the upper side of the mounting base 12. The mounting tube 1 is used to insert into the mounting tube at the rear of the vehicle for positioning.

[0034] The swing block 4 rotates at a relatively small angle, only requiring that the end of the swing block 4 can be disengaged from the locking groove 3. A torsion spring 5 can be installed on the locking shaft 41 of the swing block 4. One end of the torsion spring 5 is connected to the flip connecting block 7, and the other end of the torsion spring 5 presses the swing block 4 into the locking groove 3. The torsion spring 5 can improve the safety of the swing block 4 after it is locked into the locking groove 3.

[0035] The rotation of the swing block 4 is achieved by the shift lever 6 swinging around the block shaft 41, and the rotation angle of the swing block 4 is limited by the groove provided on the upper part of the flip connecting block 7.

[0036] In some embodiments, the positioning pin 106 can be axially moved by the positioning pin drive assembly 10. The structure of the positioning pin drive assembly 10 can be varied. A simple structure can be achieved by manually pulling a rod to lift the positioning pin 106 directly out of the positioning hole, such as a plug-in structure.

[0037] In some embodiments, such as Figure 6-11 As shown, as a specific structure of the movable pin drive assembly 10, the movable pin drive assembly 10 includes a base 104 connected to the gear shift lever 6. The positioning movable pin 106 is axially movable and installed in the end of the base 104 facing the side plate 9. An elastic element 105 connected to the positioning movable pin 106 is installed inside the base 104. A knob sleeve 101 is sleeved on the outward end of the base 104. An inner sleeve 102 is provided inside one end of the knob sleeve 101. A connecting screw 103 is axially arranged at the center of the inner sleeve 102, passing through the base 104 and connected to the positioning movable pin 106. The knob sleeve 101 and the inner sleeve 102 are screw-fitted or inclined-face-fitted. When the knob sleeve 101 rotates, it drives the inner sleeve 102 to move axially, pulling the positioning movable pin 106 out of the base 104 or retracting it into the base 104. The axial movement of the positioning movable pin 106 can be realized by rotating the knob sleeve 101, which is convenient to operate.

[0038] In this embodiment, if Figure 9-11 As shown, the outward-facing end of the base 104 is inserted into the inner sleeve 102. The inner sleeve 102 and the base 104 are anti-rotationally engaged through an axial rib groove structure 112. The axial rib groove structure 112 can prevent the inner sleeve 102 from rotating and can only move axially. The axial rib groove structure 112 is a structure in which a rib and a slot are engaged. The rib can be set on the outward-facing end of the base 104, and the slot can be set on the inner sidewall of the inner sleeve 102. Of course, the rib can also be set on the inner sidewall of the inner sleeve 102 or on the outward-facing end of the base 104, which can be selected as needed.

[0039] In this embodiment, if Figure 9 and 11As shown, at least one wedge-shaped groove 107 is provided on the outer wall of the inner sleeve 102. The inside of the knob sleeve 101 is provided with a protrusion 111 that is embedded in the corresponding wedge-shaped groove 107. When the protrusion 111 moves to the lowest end of the wedge-shaped groove 107, the inner sleeve 102 pulls the positioning pin 106 back into the base 104. The wedge-shaped groove 107 and the protrusion 111 are reliably engaged and will not disengage. At the same time, a protrusion positioning groove 108 is provided on the side of the wedge-shaped groove 107 near the lowest end. When the protrusion 111 is engaged in the protrusion positioning groove 108, the positioning pin 106 remains in the base 104. The engagement of the protrusion 111 and the protrusion positioning groove 108 can position the rotation of the knob sleeve 101, keeping the positioning pin 106 in the base 104. At this time, the gear operating lever 6 can rotate freely, and the flip connecting block 7 can rotate around the limiting plate 2.

[0040] In this embodiment, as Figure 9 As shown, the base 104 has a mounting extension plate 109 extending radially to one side on its side wall. The mounting extension plate 109 is equipped with a fixing screw 110 for connecting with the gear shift lever 6, which can easily fix the movable pin drive assembly 10 to the gear shift lever 6, and is easy to assemble and disassemble.

[0041] In this embodiment, as Figure 1-5 As shown, a positioning top block 26 is installed at the end of the mounting connector 1 away from the limiting plate 2, passing through the side wall of the mounting connector 1. When the mounting connector 1 is inserted into the corresponding mounting tube at the rear of the vehicle, the positioning top block 26 engages with the corresponding positioning groove inside the mounting tube. A movable block 25 is installed inside the mounting connector 1, and the movable block 25 and the mounting connector 1 are in an anti-rotation fit. The movable block 25 has an inclined surface 211 on the side facing the positioning top block 26, and a steel ball 21 is provided between the inclined surface 211 and the positioning top block 26. 2. The mounting connector 1 is also provided with a horizontally arranged screw 22 inside. The first end of the screw 22 is threadedly connected to the movable block 25, and the second end extends to the first end of the mounting connector 1 and is connected to the knob 24. The positioning top block 26 can be positioned with the mounting tube at the rear of the vehicle by extending and retracting relative to the side wall of the mounting connector 1. The extension and retraction of the positioning top block 26 is controlled by the rotation of the screw 2 and the knob 24. The combination of the inclined part 211 and the steel ball 212 can realize that the positioning top block 26 can extend and retract and remain locked. The operation is simple and the installation is firm.

[0042] Specifically, during installation, the positioning top block 26 is initially retracted into the side wall of the mounting connector 1. Then, the mounting connector 1 is inserted into the mounting tube at the rear of the vehicle. The inner side wall of the mounting tube also has a positioning groove that matches the positioning top block 26. After the mounting connector 1 is inserted into place, rotating the knob 24 causes the screw 22 to rotate laterally, as the screw 22 and the movable block 25 are threaded together. During this movement, the inclined surface 211 and the steel ball 212 move relative to each other. Figure 3-4 As shown, the steel ball 212 and the positioning block 26 are lifted together, and the positioning block 26 extends out to the outside of the side wall of the mounting tube 1 and embeds into the positioning groove on the mounting tube, thus realizing the installation of the bicycle frame. For example, Figure 3 As shown, the cross-section of the inclined surface 211 is a concave arc shape, which can prevent the steel ball 212 from deviating when rolling along the inclined surface 211.

[0043] In this embodiment, if Figure 1-4 As shown, the mounting connector 1 is a square tube, which facilitates the insertion of the mounting connector 1 into the mounting tube at the correct angle and also has an anti-rotation effect. Meanwhile, the movable block 25 is flat and is arranged along the diagonal of the cross-section of the mounting connector 1. The diagonal arrangement of the movable block 25 allows it to form an anti-rotation fit with the apex corner of the mounting connector 1.

[0044] In this embodiment, if Figure 1-5 As shown, the movable block 25 has a guide elongated hole 28 along its length direction, and the mounting connector 1 has a plug shaft 29 inserted horizontally through the guide elongated hole 28 on its side wall. This can guide and restrict the movement of the movable block 25 and prevent the movable block 25 from disengaging from the screw 22.

[0045] Furthermore, a through groove 210 is provided in the middle of the movable block 25, and openings 213 corresponding to the through groove 210 are provided on both side walls of the mounting connector 1. A conventional fixing pin can pass through the through groove 210 and the openings 213, since the positioning top block 26 has already played a limiting and locking role. Specifically, since a conventional fixing pin can pass through the through groove 210 and the openings 213, and the positioning top block 26 has already played a limiting and locking role, the through groove 210 and the openings 213 can adopt an oblong shape, allowing the fixing pin to be easily inserted. The fixing pin has the same structure as the fixing pin in the prior art, which is prior art, and its structure will not be described in detail here. The width of the through groove 210 and the openings 213 matches the diameter of the fixing pin.

[0046] To increase the strength of active block 25, such as Figure 4As shown, several reinforcing grooves 214 are provided on the two side walls of the movable block 25 at positions corresponding to the inclined surface 211, which can improve the strength of the movable block 25, especially the strength at the position where it mates with the positioning top block 26.

[0047] like Figure 2 As shown, the first end of the mounting connector 1 is provided with an end cap 23, and the screw 22 passes through the end cap 23, which can support the rotation of the screw 22 and limit its axial movement. The end cap 23 and the mounting connector 1 are detachable. The connection between the screw 22 and the movable block 25 can be threaded, while other positions are smooth. Limiting steps can be set at appropriate positions. The limiting steps cooperate with the end cap 23 to prevent the screw 22 from moving axially.

[0048] Meanwhile, the inner end of the end cap 23 is provided with a guide sleeve 27 sleeved on the outside of the screw 22, which can make the screw 22 rotate stably.

[0049] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0050] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0052] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A flip-type mounting base assembly for a bicycle rack, comprising a mounting base (12) and a mounting connector (1), wherein limiting plates (2) are vertically mounted on both sides of one end of the mounting connector (1), and the limiting plates (2) are provided with at least two snap-fit ​​grooves (3) along their circumferential direction on their edges, characterized in that, The mounting base (12) is located above the limiting plate (2) and its lower end is connected to a flip connecting block (7). The flip connecting block (7) extends between the two limiting plates (2). Side plates (9) are vertically installed on both sides of the lower part of the mounting base (12). A flip shaft (8) is provided in the middle of the flip connecting block (7) that passes horizontally through the limiting plate (2) and the side plate (9). A swing block (4) is installed on the upper part of the flip connecting block (7). One end of the swing block (4) is used to engage with the locking groove (3). The other end of the swing block (4) is connected to the side plate (9). The card block rotating shaft (41) has a gear operating lever (6) axially connected to the card block rotating shaft (41) installed on the outer side of the side plate (9) on either side. A positioning movable pin (106) is provided through the gear operating lever (6). A movable pin drive assembly (10) is installed on the positioning movable pin (106). The movable pin drive assembly (10) controls the positioning movable pin (106) to extend into the corresponding positioning hole on the side plate (9) when the swinging card block (4) engages with the card slot (3), and to disengage the positioning movable pin (106) from the positioning hole when the swinging card block (4) needs to disengage from the card slot (3).

2. The flip-type mounting base assembly for a bicycle rack according to claim 1, characterized in that: A torsion spring (5) is installed on the pivot shaft (41) of the swing block (4). One end of the torsion spring (5) is connected to the flip connecting block (7), and the other end of the torsion spring (5) presses the swing block (4) into the locking groove (3).

3. The flip-type mounting base assembly for a bicycle rack according to claim 1, characterized in that: The movable pin drive assembly (10) includes a base (104) connected to the gear shift lever (6). The positioning movable pin (106) is axially movable and installed in the end of the base (104) facing the side plate (9). An elastic element (105) connected to the positioning movable pin (106) is installed inside the base (104). A knob sleeve (101) is fitted on the outward end of the base (104). The part is provided with an inner sleeve (102), and the inner sleeve (102) is provided with a connecting screw (103) that passes through the base (104) and connects to the positioning movable pin (106) in the central axis. The knob sleeve (101) and the inner sleeve (102) are screwed or inclined. When the knob sleeve (101) rotates, it drives the inner sleeve (102) to move axially, pulling the positioning movable pin (106) out of the base (104) or retracting into the base (104).

4. The flip-type mounting base assembly for a bicycle rack according to claim 3, characterized in that: The outer end of the base (104) is inserted into the inner sleeve (102), and the inner sleeve (102) and the base (104) are anti-rotationally fitted by an axial rib groove structure (112).

5. The flip-type mounting base assembly for a bicycle rack according to claim 4, characterized in that: The inner sleeve (102) has at least one wedge groove (107) on its outer side wall. The knob sleeve (101) has a protrusion (111) embedded in the corresponding wedge groove (107). When the protrusion (111) moves to the lowest end of the wedge groove (107), the inner sleeve (102) pulls the positioning pin (106) back into the base (104).

6. The flip-type mounting base assembly for a bicycle rack according to claim 5, characterized in that: The wedge-shaped groove (107) is provided with a protrusion positioning groove (108) on the side near the lowest end. When the protrusion (111) is inserted into the protrusion positioning groove (108), the positioning movable pin (106) remains in the base (104).

7. The flip-type mounting base assembly for a bicycle rack according to claim 3, characterized in that: The base (104) has a mounting extension plate (109) that extends radially to one side on its side wall, and the mounting extension plate (109) is equipped with a fixing screw (110) for connecting to the gear shift lever (6).

8. The flip-type mounting base assembly for a bicycle rack according to claim 1, characterized in that: The mounting connector (1) is equipped with a positioning top block (26) that passes through the side wall of the mounting connector (1) at one end away from the limiting plate (2). When the mounting connector (1) is inserted into the corresponding mounting tube at the rear of the car, the positioning top block (26) engages with the corresponding positioning groove inside the mounting tube. A movable block (25) is installed inside the mounting connector (1). The movable block (25) and the mounting connector (1) are anti-rotation fit. The movable block (25) has a beveled part (211) on the side facing the positioning top block (26). A steel ball (212) is provided between the beveled part (211) and the positioning top block (26). A screw (22) is also provided laterally inside the mounting connector (1). The first end of the screw (22) is threaded to the movable block (25), and the second end extends to the first end of the mounting connector (1) and is connected to the knob (24).

9. The flip-type mounting base assembly for a bicycle rack according to claim 8, characterized in that: The movable block (25) has a guide strip hole (28) along its length direction, and the mounting connector (1) has a plug shaft (29) that passes through the guide strip hole (28) inserted horizontally on its side wall.

10. The flip-type mounting base assembly for a bicycle rack according to claim 8, characterized in that: The movable block (25) has a through groove (210) in the middle, and the mounting connector (1) has openings (213) on both sides corresponding to the through groove (210).

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