trailer coupler

Abstract

The present invention discloses a trailer coupler, comprising a mounting seat, a trailer hook, a locking member, and an unlocking device. The mounting seat is provided with a downwardly open mounting cavity. The trailer hook comprises a hooking portion and a connecting portion fixedly connected to the hooking portion. The locking member has a locking state for locking the connecting portion within the mounting cavity and an unlocking state for releasing the locking of the connecting portion. The unlocking device is used to drive the locking member to switch from the locked state to the unlocked state. The inner wall of the mounting cavity is provided with a blocking surface. The connecting portion is provided with an anti-falling surface. When the locking member is in the unlocked state, the anti-falling surface can be hung on the blocking surface to prevent the trailer hook from falling. The trailer coupler of the present invention can prevent the trailer hook from suddenly falling when the locking member is in the unlocked state, thereby protecting the safety of the user and improving the user experience.

Description

Technical field

[0001] The present invention relates to the field of automobile technology, in particular to a trailer coupler. [Background Technology]

[0002] As people's lifestyles continue to change, more and more people have greater demands on the mounting performance of cars. Fixed trailer hooks are widely used on existing cars. The trailer hooks are directly or indirectly connected to the car's supporting structure through an adapter chassis. The problems with this installation method are: since the hook portion of the trailer hook permanently extends beyond the rear bumper, it reduces the car's aesthetics and weakens the safety function of the car's rear bumper, posing a safety hazard to users. In addition, the trailer hook extending beyond the rear bumper may damage other vehicles during parking operations, causing economic losses to users.

[0003] To overcome the above-mentioned shortcomings, a detachable trailer coupler is disclosed in the prior art, comprising a mounting base, a trailer hook mounting base, a locking member, and an unlocking device. The mounting base is provided with a downwardly open mounting cavity, the bottom of which is provided with a socket. The trailer hook includes a connecting portion that is inserted into the mounting cavity through the socket. The locking member has a locked state for locking the connecting portion within the mounting cavity and an unlocked state for releasing the lock on the connecting portion. The unlocking device is used to drive the locking member to switch from the locked state to the unlocked state. This allows the trailer hook to be removed from the mounting base and stored when it is no longer needed, thereby avoiding the above-mentioned problems. However, when the trailer hook is removed, since the locking member is in the unlocked state, the trailer hook may fall and injure the user if the user does not tow the trailer hook, thereby reducing the user's experience. [Summary of the invention]

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a trailer coupler that can prevent the trailer hook from suddenly falling when the locking member is in the unlocked state, thereby protecting the safety of the user and improving the user experience.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A trailer coupler comprises a mounting seat, a trailer hook, a locking member and an unlocking device, wherein a mounting cavity open downward is provided in the mounting seat, the trailer hook comprises a hooking portion and a connecting portion fixedly connected to the hooking portion, the locking member has a locking state in which the connecting portion is locked in the mounting cavity and an unlocking state in which the connecting portion is unlocked, the unlocking device is used to drive the locking member to switch from the locked state to the unlocked state, the inner wall of the mounting cavity is provided with a blocking surface, and the connecting portion is provided with an anti-falling surface, and when the locking member is in the unlocked state, the anti-falling surface can be hung on the blocking surface to prevent the trailer hook from falling.

[0007] In the above-mentioned trailer coupler, a vertically extending anti-fall groove is provided on one side of the connecting portion, the upper end of the anti-fall groove is closed, the top wall of the anti-fall groove forms the anti-fall surface, and the inner wall of the mounting cavity is provided with a blocking block inserted into the anti-fall groove, and the top surface of the blocking block forms the blocking surface.

[0008] In the above trailer coupler, the lower end of the anti-falling groove is closed, and the lower end of the anti-falling groove is located in the installation cavity.

[0009] In the above-mentioned trailer coupler, the inner wall of the mounting cavity is provided with a vertically extending blocking groove, the lower end of the blocking groove is closed, the bottom wall of the blocking groove forms the blocking surface, and one side of the connecting part is provided with an anti-falling protrusion inserted into the blocking groove, and the bottom surface of the anti-falling protrusion forms the anti-falling surface.

[0010] In the above trailer coupler, the anti-falling surface is an inclined surface extending obliquely downward, and the blocking block extends obliquely upward toward the inside of the installation cavity to cooperate with the inclined surface.

[0011] In the above trailer coupler, a guide slope is further provided in the installation cavity, which is inclined from bottom to top toward the blocking surface. The guide slope is used to guide the connecting part to move toward the blocking surface during insertion, so that the anti-falling surface is located above the blocking surface.

[0012] In the above trailer coupler, the side of the connecting portion facing away from the blocking surface is locked in the installation cavity by a locking member, and the guiding inclined surfaces are provided on both sides of the locking member.

[0013] In the above-mentioned trailer coupler, the connecting part includes a main body and an insert block provided on the top of the main body, the insert block and the top of the main body form an avoidance step, the anti-fall surface is provided on the side of the insert block opposite to the avoidance step, when the locking member is in a locked state, the first gap between the anti-fall surface and the blocking surface is greater than the depth of the transverse surface of the avoidance step extending into the installation cavity, and a second gap exists between the vertical surface of the avoidance step and the inner wall of the installation cavity, when the locking member is in an unlocked state, the anti-fall surface moves downward to eliminate the first gap and then moves in a direction away from the blocking surface to eliminate the second gap to avoid the blocking surface, so that the connecting part is removed from the installation cavity.

[0014] In the above trailer coupler, the locking member is rotatably mounted in the mounting cavity, and a locking groove is provided on the side of the connecting portion facing away from the blocking surface. When the locking member is in a locked state, the locking member is engaged in the locking groove, and when the locking member is in an unlocked state, the locking member is disengaged from the locking groove.

[0015] In the above trailer coupler, the unlocking device includes an unlocking push rod and a manual operating assembly. The unlocking push rod is vertically slidably installed on the connecting portion, and the manual operating assembly drives the unlocking push rod to move upward into the installation cavity to switch the locking member to the unlocked state.

[0016] Beneficial effects of the present invention:

[0017] When the trailer hook is disassembled, the locking part of the present invention will be in an unlocked state. At this time, the trailer hook will move downward under the action of gravity, and the connecting part is hung on the blocking surface through the anti-fall surface, which can prevent the trailer hook from falling suddenly, thereby protecting the safety of the user and improving the user experience.

[0018] A vertically extending anti-drop groove is provided on one side of the connecting portion. The upper end of the anti-drop groove is closed, and the top wall of the groove forms an anti-drop surface. The inner wall of the mounting cavity is provided with a blocking block that is inserted into the anti-drop groove, and the top surface of the blocking block forms a blocking surface. This design not only reduces the weight of the trailer hook by providing the anti-drop groove, making assembly and disassembly of the trailer hook more labor-saving, but also has a relatively simple overall structure that is easy to process and form, reducing the manufacturing cost of the trailer coupler.

[0019] The lower end of the anti-drop groove is closed and located within the mounting cavity. This design not only conceals the anti-drop groove within the mounting cavity, enhancing the trailer coupler's appearance, but also prevents dust and foreign matter from entering the anti-drop groove and mounting cavity, which could prevent the trailer hook from being pulled downward for removal.

[0020] The anti-fall surface is a sloped surface extending obliquely downward, and the blocking block extends obliquely upward toward the interior of the mounting cavity to cooperate with the sloped surface. This design allows the anti-fall surface to be hooked onto the blocking surface, thereby increasing the stability of the anti-fall surface hanging on the blocking surface and further preventing the trailer hook from falling.

[0021] The mounting cavity also features a guide slope that slopes upward from bottom to top toward the blocking surface. This slope guides the connector toward the blocking surface during installation, ensuring the anti-fall surface is positioned above it. This design ensures the anti-fall surface is positioned smoothly above the blocking surface when the connector is inserted into the mounting cavity. This ensures the anti-fall surface is positioned above the blocking surface as soon as the connector is properly installed, eliminating the need to adjust the connector's position. This simplifies trailer hook assembly.

[0022] The side of the connecting portion facing away from the blocking surface is locked in the installation cavity by a locking member, and the guiding slopes are provided on both sides of the locking member. This design not only improves the guiding stability of the guiding slopes on the connecting portion, preventing the connecting portion from tilting and getting stuck during insertion, but also allows the locking member to operate smoothly as the connecting portion moves toward the blocking surface, locking the connecting portion in the installation cavity.

[0023] The connecting portion includes a main body and an insert block disposed on the top of the main body, the insert block and the top of the main body forming an avoidance step, an anti-falling surface disposed on the side of the insert block opposite the avoidance step, and when the locking member is in a locked state, a first gap between the anti-falling surface and the blocking surface is greater than the depth of the transverse surface of the avoidance step extending into the installation cavity, and a second gap exists between the vertical surface of the avoidance step and the inner wall of the installation cavity, and when the locking member is in an unlocked state, the anti-falling surface moves downward to eliminate the first gap, and then moves in a direction away from the blocking surface to eliminate the second gap to avoid the blocking surface, allowing the connecting portion to be removed from the installation cavity. With this design, after the anti-falling surface is hung on the blocking surface, when the connecting portion is subsequently removed from the installation cavity, it is necessary to first lift the trailer hook so that the anti-falling surface is located above the blocking surface, then move the trailer hook toward the side away from the blocking surface to eliminate the second gap, so that the vertical projection of the anti-falling surface is completely located outside the blocking surface, and finally pull the trailer hook downward to remove the connecting portion from the installation cavity.

[0024] The locking member is rotatably mounted within the mounting cavity, and a locking groove is provided on the side of the connecting portion facing away from the blocking surface. When the locking member is in the locked state, the locking member engages in the locking groove, and when the locking member is in the unlocked state, the locking member disengages from the locking groove. This design has a simple structure and is easy to process and form, reducing the manufacturing cost of the trailer coupler.

[0025] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

Brief Description of the Drawings

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] Figure 1 This is a structural schematic diagram of a trailer coupler installed on a vehicle body in a first embodiment of the present invention;

[0028] Figure 2 This is an exploded schematic diagram of a trailer hook in the first embodiment of the present invention;

[0029] Figure 3 This is a partial structural diagram of the unlocking device in Example 1 of the present invention;

[0030] Figure 4 This is a cross-sectional view of a partial structure of the unlocking device installed on the main body in the first embodiment of the present invention;

[0031] Figure 5 This is a structural diagram of a blocking plate in Example 1 of the present invention;

[0032] Figure 6 This is a schematic structural diagram of a trailer hook in Embodiment 1 of the present invention;

[0033] Figure 7 This is an exploded schematic diagram of the mounting base in the first embodiment of the present invention;

[0034] Figure 8 This is an exploded schematic diagram of the mounting base structure in the first embodiment of the present invention;

[0035] Figure 9 is a cross-sectional view of the base body in embodiment 1 of the present invention;

[0036] Figure 10 This is a cross-sectional view of the locking member in the first embodiment of the present invention when the connecting portion is locked in the mounting cavity;

[0037] Figure 11 for Figure 10 Cross-sectional view of AA;

[0038] Figure 12 for Figure 10 Cross-sectional view of the middle BB;

[0039] Figure 13 This is a cross-sectional view of the locking member when it is out of the locking groove in the first embodiment of the present invention.

[0040] Reference numerals:

[0041] 001, anti-collision beam; 002, connecting plate; 100, mounting seat; 110, seat body; 111, mounting cavity; 1111, limiting surface; 1112, blocking surface; 1113, guiding slope; 112, first through-hole; 113, second through-hole; 114, mounting opening; 1141, main opening; 1142, foolproof opening; 115, third positioning portion; 116, limiting groove; 117, groove ; 120, locking member; 121, first conical arc surface; 122, first plug-in portion; 123, avoidance groove; 124, foolproof boss; 130, rotating shaft; 131, gripping end; 132, insertion end; 133, second plug-in portion; 134, positioning lug; 140, elastic reset member; 141, twist foot; 150, upper cover; 160, sealing cover; 170, lifting rod; 200 , trailer hook; 210, hooking portion; 220, connecting portion; 2201, locking groove; 22010, second conical arc surface; 221, main body; 2211, first positioning portion; 2210, cavity; 222, blocking plate; 2221, boss; 2222, positioning groove; 2223, first limiting surface; 2224, guide groove; 223, plug; 224, anti-fall groove; 2241, anti-fall Surface; 230, unlocking push rod; 240, manual operation assembly; 241, knob; 242, cam; 2421, rotating portion; 2422, extension portion; 243, cam shaft; 2431, non-cylindrical section; 2432, limiting boss; 24321, second positioning portion; 2433, cylindrical section; 244, connecting sleeve; 245, retaining ring; 246, sealing ring; 247, sealing gasket. [Specific implementation method]

[0042] The present invention provides a trailer coupler, including a mounting seat, a trailer hook, a locking member and an unlocking device, wherein a mounting cavity open downward is provided in the mounting seat, the trailer hook includes a hooking portion and a connecting portion fixedly connected to the hooking portion, the locking member has a locking state in which the connecting portion is locked in the mounting cavity and an unlocking state in which the connecting portion is released, the unlocking device is used to drive the locking member to move so that the locking member switches from the locked state to the unlocked state, the inner wall of the mounting cavity is provided with a blocking surface, and the connecting portion is provided with an anti-falling surface, and when the locking member is in the unlocked state, the anti-falling surface can be hung on the blocking surface to prevent the trailer hook from falling.

[0043] In the present invention, when the trailer hook is disassembled, the locking part will be in an unlocked state. At this time, the trailer hook will move downward under the action of gravity, and the connecting part is hung on the blocking surface through the anti-fall surface, which can prevent the trailer hook from falling suddenly, thereby protecting the safety of the user and improving the user experience.

[0044] The technical solutions of the embodiments of the present invention are explained and illustrated below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without making creative work all fall within the scope of protection of the present invention. In addition, it should be understood that the following words indicating orientation or positional relationship such as "up", "down", "left", "right", "longitudinal", "lateral", "inside", "outside", "vertical", "horizontal", "top", "bottom", etc. are only based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0045] Example 1

[0046] Reference Figures 1 to 13As shown, the trailer coupler in this embodiment includes a mounting base 100, a trailer hook 200, a locking member 120 and an unlocking device. The mounting base 100 is fixedly connected to the connecting plate 002 of the anti-collision beam 001 by screws. The mounting base 100 includes a base body 110, and a mounting cavity 111 is provided in the base body 110. The lower end of the mounting cavity 111 is open to form a socket. The trailer hook 200 includes a hook portion 210 and a connecting portion 220. The hook portion 210 is L-shaped. The connecting portion 220 and the transverse section of the hook portion 210 are integrally processed and formed to achieve a fixed connection between the two. The part 220 extends vertically upward and is inserted upward into the installation cavity 111 through the socket. The locking member 120 has a locking state in which the connecting part 220 is locked in the installation cavity 111 and an unlocking state in which the connecting part 220 is unlocked. The unlocking device is used to drive the locking member 120 to move so that it switches from the locked state to the unlocked state. The inner wall of the installation cavity 111 is provided with a blocking surface 1112, and the connecting part 220 is provided with an anti-falling surface 2241. When the locking member 120 is in the unlocked state, the anti-falling surface 2241 can be hung on the blocking surface 1112 to prevent the trailer hook 200 from falling.

[0047] In this embodiment, when the trailer hook 200 is disassembled, the locking member 120 will be in an unlocked state. At this time, the trailer hook 200 will move downward under the action of gravity, and the connecting portion 220 is hung on the blocking surface 1112 through the anti-fall surface 2241, which can prevent the trailer hook 200 from falling suddenly, thereby protecting the user's safety and improving the user experience.

[0048] Specifically, such as Figures 2 to 6 、 Figure 10 、 Figure 12As shown, the connecting portion 220 in this embodiment includes a main body 221 provided with a cavity 2210, a sealing plate 222, and an insert block 223 provided on the top of the main body 221. The insert block 223 is integrally formed at the top of the main body 221, and an opening is provided on one side of the cavity 2210. The unlocking device includes an unlocking push rod 230 and a manual operation component 240. The unlocking push rod 230 slides vertically through the top wall of the cavity 2210, and the manual operation component 240 includes a knob 241, a cam 242, a cam shaft 243 and a connecting sleeve 244. The cam 242 is provided with a first non-circular hole, and the connecting sleeve 244 is provided with a second non-circular hole. The first non-circular hole and the second non-circular hole can be D-shaped holes, square holes, etc. Preferably, the first non-circular hole and the second non-circular hole are both D-shaped holes. The cam shaft 243 includes a non-cylindrical section 2431, a limiting boss 2432 provided at one end of the non-cylindrical section 2431, and a cylindrical section 2433 provided at the other end of the non-cylindrical section 2431. The limiting boss 2432 is limited to the outside of the cavity 2210. The non-cylindrical section 2431 passes through the cavity 2210, the first non-circular hole and the second non-circular hole. The cylindrical section 2433 passes through the knob 241 and is covered with a retaining spring 245 to achieve the connection between the cam shaft 243 and the knob 241. The middle connecting sleeve 244 has a non-cylindrical section that cooperates with the knob 241. Rotating the knob 241 drives the connecting sleeve 244, the cam shaft 243, and the cam 242 to rotate synchronously. After assembly, the bottom end of the unlocking push rod 230 abuts against the arc surface of the cam 242. When the knob 241 drives the cam 242 to rotate upward, the unlocking push rod 230 is driven upward. When the knob 241 drives the cam 242 to rotate downward, the unlocking push rod 230 moves downward and resets under the action of gravity. In addition, this design is also relatively simple in structure, and the assembly of the cam 242 and the cam shaft 243 is more convenient, thereby further reducing the difficulty of assembling the unlocking device. Finally, compared with the electric unlocking device, manual unlocking not only simplifies the unlocking device structure, thereby facilitating the assembly of the trailer hook 200 and improving the assembly efficiency of the trailer hook 200, but also reduces the problem of the trailer hook 200 being unable to be disassembled and assembled due to electrical failure.

[0049] In addition, if Figure 3 、 Figure 5 and Figure 10As shown, in order to further reduce the difficulty of assembling the unlocking device, in this embodiment, the inner side surface of the blocking plate 222 is provided with a boss 2221 located in the cavity 2210, and the boss 2221 is provided with a positioning groove 2222. The cam 242 includes a rotating part 2421 that cooperates with the cam shaft 243 and an extension part 2422 that is connected to the outer peripheral side of the rotating part 2421. The rotating part 2421 is confined in the positioning groove 2222, and the boss 2221 is provided with a first limiting surface 2223 located below the positioning groove 2222. One side of the extension part 2422 cooperates with the first limiting surface 2223 so that the cam 242 is hung on the boss 2221. With such a design, the posture of the cam 242 hung on the boss 2221 can be limited by the first limiting surface 2223 to ensure the posture of the first non-circular hole. During assembly, the cam 242 is first hung on the boss 2221 for pre-positioning, and then the cam shaft 243 is passed through the main body 221 and the cam 242. It can be seen that when the cam 242 is assembled, there is no need to manually maintain the posture of the first non-circular hole, thereby further reducing the assembly difficulty of the unlocking device; finally, the blocking plate 222 is installed on the main body 221 by screws. With such a design, the blocking plate 222 can be detachably connected to facilitate the later disassembly or maintenance of the cam 242.

[0050] Preferably, the boss 2221 is further provided with a guide groove 2224 located above the positioning groove 2222. The guide groove 2224 has an opening, and the unlocking push rod 230 is inserted into the guide groove 2224 through the opening and vertically slides in the guide groove 2224. This design allows the unlocking push rod 230 to be guided in its vertical movement by the guide groove 2224, thereby preventing the unlocking push rod 230 from deflecting and getting stuck during its vertical movement.

[0051] like Figure 6 As shown, in order to further facilitate the assembly of the cam shaft 243, in this embodiment, a first positioning portion 2211 is provided on the surface of the main body 221, and the first positioning portion 2211 is a positioning countersunk hole or a positioning convex point. The outer peripheral side of the limiting boss 2432 is provided with a second positioning portion 24321. When the cam shaft 243 is inserted into the main body 221, the second positioning portion 24321 corresponds to the first positioning portion 2211, so that the transmission plane of the non-cylindrical segment 2431 can be aligned with the transmission plane of the first non-circular hole, so that the non-cylindrical segment 2431 can smoothly pass through the first non-circular hole, and there is no need to rotate the cam shaft 243 to make the transmission plane of the non-cylindrical segment 2431 aligned with the transmission plane of the first non-circular hole, thereby further reducing the difficulty of assembling the cam shaft 243 and the cam, and further reducing the difficulty of assembling the unlocking device.

[0052] Secondly, in order to prevent dust and water from entering the cavity 2210, a sealing ring 246 is also provided on the outside of the limiting boss 2432 and the connecting sleeve 244. The axial cross-section of the sealing ring 246 is a V-shaped structure with the opening facing outward to improve the sealing reliability, and a sealing gasket 247 is clamped between the sealing plate 222 and the main body 221. Such a design can achieve dustproof and waterproof effects through the sealing gasket 247, thereby preventing foreign matter from existing in the cavity 2210 and causing the cam 242 to be unable to move, thereby affecting the disassembly and assembly of the trailer hook 200.

[0053] It should be noted that, in this embodiment, the plug block 223 and the top of the main body 221 form an avoidance space for avoiding the unlocking push rod 230, and the plug block 223 is partially recessed on one side of the avoidance space (i.e., the side facing away from the blocking surface 1112) to form a lock groove 2201. The lock groove 2201 is an arc-shaped groove. In this embodiment, part of the connecting portion 220 is inserted into the mounting cavity 111, that is, the plug block 223 is inserted into the mounting cavity 111, and the locking member 120 is snapped into the lock groove 2201 to achieve locking of the plug block 223. When the unlocking push rod 230 moves upward, it can enter the avoidance space to push the locking member 120 to rotate upward and thereby release the lock on the connecting portion 220.

[0054] like Figures 7 to 9 As shown, in this embodiment, the mounting base 100 is further provided with a rotating shaft 130 that passes through the mounting cavity 111, and the locking member 120 is a fan-shaped plate. The locking member 120 is sleeved on the rotating shaft 130 and can rotate. The opposite sides of the base body 110 are respectively provided with a first through-hole 112 and a second through-hole 113 that are coaxially arranged. The first through-hole 112 and the second through-hole 113 are communicated with the mounting cavity 111. The rotating shaft 130 has a gripping end 131 and an insertion end 132, wherein the first through-hole 112 Corresponding to the gripping end 131, the diameter of the first through-hole 112 is smaller than the outer diameter of the gripping end 131, and the outer diameter of the insertion end 132 is smaller than the diameter of the second through-hole 113. The rotating shaft 130 is sequentially arranged through the first through-hole 112, the mounting cavity 111, and the second through-hole 113. An elastic circlip is mounted on the insertion end 132. The elastic circlip is larger than the diameter of the second through-hole 113. The gripping end 131 and the elastic circlip axially constrain the rotating shaft 130 to the base 110. The locking member 120 is rotatably mounted on the portion of the rotating shaft 130 located in the mounting cavity 111, thereby achieving rotatable installation of the locking member 120 within the mounting cavity 111. In this embodiment, the locking member 120 is rotatably installed in the installation cavity 111, and the unlocking device is installed in the connecting portion 220 of the trailer hook 200. When the locking member 120 or the unlocking device needs to be repaired, it is only necessary to disassemble the mounting base 100 or the trailer hook 200 separately, which makes the disassembly and maintenance of the trailer coupler simpler and more convenient. Finally, the unlocking device is arranged on the trailer hook 200, and the unlocking device can be kept away from the chassis, so as to facilitate the user to operate the unlocking device and enhance the user experience.

[0055] In addition, an elastic reset member 140 is further provided in the mounting cavity 111 of the present embodiment. The elastic reset member 140 is a torsion spring having two torsion feet 141. A first plug-in portion 122 is provided on the fan-shaped surface of the locking member 120 facing the first through-hole 112. The first plug-in portion 122 is a conical countersunk hole. The rotating shaft 130 includes a shaft body and a limit plate provided at one end of the shaft body. The outer diameter of the limit plate is greater than the outer diameter of the shaft body. The limit plate forms the above-mentioned holding end 131, and the other end of the shaft body forms an insertion end 132. An annular boss is provided between the outer diameters of the two between the shaft body and the holding end 131. The annular boss is provided with a second plug-in portion 133. The second plug-in portion 133 is along the axis of the shaft body. The line extends into the slot, and the torsion spring is sleeved on the shaft, one of the torsion pins 141 is inserted into the tapered countersunk hole, and the other torsion pin is inserted into the slot, so that the locking member 120 can be driven to rotate and reset by the restoring force of the torsion spring to be stuck in the lock slot 2201. There is no need to set up other complex structures to drive the locking member 120 to rotate and reset, and only one torsion spring needs to be added, thereby simplifying the structure of the mounting base 100 and the trailer connector, and improving the assembly efficiency of the trailer connector; in addition, with this design, the design of the first plug-in portion 122 and the second plug-in portion 133 also facilitates the assembly of the torsion spring, further reduces the assembly difficulty of the mounting base 100, and improves the assembly efficiency of the mounting base 100.

[0056] In order to facilitate the assembly of the mounting base 100, the outer side of the base body 110 is provided with a third positioning portion 115 and a limiting groove 116 located on the periphery of the first through-hole 112 and circumferentially spaced. The third positioning portion 115 is a positioning blind hole or a positioning protrusion, preferably a positioning blind hole. The outer periphery of the limiting plate is convexly provided with a positioning lug 134. The top of the base body 110 is provided with a mounting port 114 connected to the mounting cavity 111, and the inner wall of the mounting cavity 111 is provided with a second limiting surface 1111. The second limiting surface 1111 is located directly below the mounting port 114 and extends downwardly in the direction of the lock slot 2201. Mounting base 100 also includes an upper cover plate 150 screwed onto the top of base body 110 to cover mounting opening 114. A sealing gasket is provided between upper cover plate 150 and base body 110 to seal and cover mounting opening 114, achieving a dust-proof and waterproof effect. This prevents foreign matter from entering mounting cavity 111, which could cause locking member 120 to fail to rotate and thus affect assembly and disassembly of trailer hook 200. A groove 117 is also defined on one side of base body 110, with a second through-hole 113 disposed on the bottom wall of groove 117.

[0057] When assembling the mounting seat 100, first insert the locking member 120 into the mounting cavity 111 through the mounting opening 114, and the radial side surface of the locking member 120 cooperates with the second limiting surface 1111, so as to pre-position the locking member 120 through the second limiting surface 1111, so that the first plug-in portion 122 and the third positioning portion 115 are located on the same straight line, and then the nylon gasket, sealing sheet and torsion spring are successively mounted on the rotating shaft 130, and one twist leg 141 of the torsion spring is inserted into the second plug-in portion 133. At this time, the positioning lug 134, the second plug-in portion 133 and the two twist legs 141 are all located on the same straight line, and then this assembly is successively inserted into the seat body 110 through the first through-hole 112, the locking member 120 and the second through-hole 113. When inserting, first align the positioning lug 134 on the rotating shaft 130 with the third positioning portion 115, so that the rotating shaft 1 When the cam 130 is in the closed position, the locking member 120 is pressed against the second limiting surface 1111 under the torsion force of the torsion spring, thereby preventing the locking member 120 from shaking and colliding with the wall of the mounting cavity 111 and making noise after the trailer hook is disassembled, and at the same time, preventing the rotating shaft 130 from rotating relative to the seat body 110; then, the elastic retaining ring is clamped on the insertion end 132 of the rotating shaft 130 to fix the rotating shaft 130 and prevent it from falling off; finally, the sealing cover 160 is inserted into the groove 117, and the upper cover plate 150 and the sealing gasket are installed on the top of the seat body 110, thus completing the assembly of the mounting seat 100.

[0058] It should be noted that two threaded blind holes are also provided on the sealing cover 160. When the sealing cover 160 needs to be removed, the screws are screwed onto the sealing cover 160, and then the screws are pulled outward to remove the sealing cover 160 from the groove 117.

[0059] When the trailer coupler of this embodiment is used, if it is necessary to assemble the trailer hook 200 for hooking, first ensure that the unlocking push rod 230 is in the downward reset state, and then insert the connecting part 220 into the installation cavity 111 through the socket. During the insertion into the installation cavity 111, the plug block 223 will push the locking member 120 to rotate upward around the rotating shaft 130. When the connecting part 220 is assembled in place, the locking member 120 rotates downward and resets under the torsion force of the torsion spring and is stuck in the locking groove 2201 to lock the connecting part 220 in the installation cavity 111. At this time, the locking member 120 is in a locked state against the second limiting surface 1111 (as shown in FIG. Figure 10As shown), in this way, the second limiting surface 1111 can prevent the locking member 120 from rotating downward when in the locked state, so as to prevent the trailer hook 200 from driving the locking member 120 to rotate downward under the action of its own gravity or the action of external force to disengage the locking groove 2201, that is, to prevent the trailer hook 200 from falling off, thereby improving the locking reliability of the locking member 120 on the connecting portion 220. If it is necessary to remove the trailer hook 200 for storage, the knob 241 is rotated to make the cam shaft 243 drive the cam 242 to rotate upward, so that the cam 242 drives the unlocking push rod 230 to move upward, and the unlocking push rod 230 enters the installation cavity 111 and pushes the locking member 120 to rotate upward and disengage the locking groove 2201, so as to release the locking member 120 from the connecting portion 220. At this time, the locking member 120 is in the unlocked state (as shown). Figure 13 shown).

[0060] It is understandable that in other embodiments of the present invention, the elastic reset member may also be a tension spring provided between the locking member and the second limiting surface, and the tension spring is used to drive the locking member to rotate and reset and snap into the lock groove.

[0061] It is understandable that in other embodiments of the present invention, the cam shaft is connected to the motor, and the motor drives the cam shaft to rotate the cam, which can move the unlocking push rod upward to push the locking member to rotate upward and disengage from the lock slot.

[0062] like Figure 9 and Figure 13 As shown, in order to prevent the trailer hook 200 from suddenly falling and injuring the user when the locking member 120 is in the unlocked state, a vertically extending anti-falling groove 224 is provided on the side of the plug block 223 away from the lock groove 2201 in this embodiment. The upper end of the anti-falling groove 224 is closed, and the top wall of the anti-falling groove 224 forms the above-mentioned anti-falling surface 2241. A blocking block is convexly provided on the inner wall of the installation cavity 111, and the top surface of the blocking block forms the blocking surface 1112. The connecting portion 220 is locked in the installation cavity 11 1, the blocking block is inserted into the anti-fall groove 224, and the blocking surface 1112 is located below the anti-fall surface 2241. In this way, when the locking member 120 is in the unlocked state, the anti-fall surface 2241 can be hung on the blocking surface 1112 to prevent the trailer hook 200 from falling. The overall structure is relatively simple and easy to process and form, which reduces the manufacturing cost of the trailer coupler. In addition, the design of the anti-fall groove can also reduce the weight of the trailer hook 200, so that the disassembly and assembly of the trailer hook 200 is more labor-saving.

[0063] Preferably, the anti-fall surface 2241 is an inclined surface extending obliquely downward, and the blocking surface 1112 extends obliquely upward toward the inside of the installation cavity 111. When the anti-fall surface 2241 is hung on the blocking surface 1112, the blocking surface 1112 cooperates with the inclined surface. Such a design can enable the anti-fall surface 2241 to be hooked on the blocking surface 1112, thereby increasing the stability of the anti-fall surface 2241 hanging on the blocking surface 1112, and further preventing the trailer hook 200 from falling.

[0064] Preferably, the lower end of the anti-fall groove is closed and located in the mounting cavity 111. This design not only allows the anti-fall groove to be hidden in the mounting cavity 111 to enhance the appearance of the trailer coupler, but also prevents dust and foreign matter from entering the anti-fall groove and the mounting cavity 111, thereby preventing the trailer hook 200 from being pulled downward for removal.

[0065] In addition, if Figure 13 As shown, in this embodiment, the plug block 223 and the top of the main body 221 form an avoidance step, the vertical surface of the avoidance step is provided with the above-mentioned lock groove 2201, the unlocking push rod 230 passes through the horizontal surface of the avoidance step, the size of the plug block 223 is smaller than the size of the socket, and the size of the main body 221 matches the size of the socket, so that when the locking member 120 is in the locked state, the main body 221 can block the socket, and when the locking member 120 is in the locked state, the anti-falling surface 2241 is located above the blocking surface 1112, and the first gap between the anti-falling surface 2241 and the blocking surface 1112 is H1, and the depth of the horizontal surface of the avoidance step extending into the installation cavity 111 is H2, satisfying H1>H2, and there is a second gap W1 between the vertical surface of the avoidance step and the inner wall of the installation cavity 111. When the anti-fall surface 2241 is hung on the blocking surface 1112, the fitting width of the two is W2, satisfying W1>W2. After the anti-fall surface 2241 is hung on the blocking surface 1112, when the connecting part 220 is subsequently removed from the installation cavity 111, it is necessary to first lift the trailer hook 200 so that the anti-fall surface 2241 is located above the blocking surface 1112 and ensure that the horizontal surface of the avoidance step is located outside the installation cavity 111. Then, move the trailer hook 200 toward the side away from the blocking surface 1112 to eliminate the second gap, so that the vertical projection of the anti-fall surface 2241 is completely located outside the vertical projection of the blocking surface 1112, that is, the anti-fall surface 2241 avoids the blocking surface 1112. Finally, pull the trailer hook 200 downward to remove the connecting part 220 from the installation cavity 111.

[0066] In addition, in this embodiment, a guide slope 1113 is provided in the installation cavity 111, which is inclined from bottom to top toward the blocking surface 1112. The guide slope 1113 is located on the left and right sides of the locking member 120 when it is in a locked state. When the connecting portion 220 is against the bottom of the guide slope 1113, the blocking block is located outside the anti-fall groove, that is, it is not inserted into the anti-fall groove. When the connecting portion 220 is against the top of the guide slope 1113, the blocking block is inserted into the anti-fall groove, and the anti-fall surface 2241 is located above the blocking surface 1112. With this design, when the connecting portion 220 is inserted into the installation cavity 111, the guiding inclined surface 1113 can guide the connecting portion 220 to move laterally toward the blocking surface 1112, so that the blocking block is inserted into the anti-fall groove 224, and the anti-fall surface 2241 is smoothly moved to the top of the blocking surface 1112, that is, after the connecting portion 220 is inserted into place, the anti-fall surface 2241 can be ensured to be located above the blocking surface 1112, and there is no need to adjust the position of the connecting portion 220 separately, thereby reducing the assembly difficulty of the trailer hook 200. When disassembling, push the trailer hook 200 upward to make the insertion block 223 abut against the guiding inclined surface 1113, and ensure that the anti-fall surface 2241 is located above the blocking surface 1112, and then pull the trailer hook downward. 200, at this time, the insertion block 223 moves obliquely to the left and downward along the guiding inclined surface 1113, so that the trailer hook 200 can be removed from the mounting base 100, making disassembly more convenient; in addition, the guiding inclined surfaces 1113 are provided on both sides of the locking member 120, which can also improve the guiding stability of the guiding inclined surfaces 1113 on the connecting portion 220, and avoid the connecting portion 220 from tilting and getting stuck during insertion; finally, since the locking groove 2201 is provided on the side of the connecting portion 220 facing away from the blocking surface 1112, the locking groove 2201 can be avoided by moving the connecting portion 220 toward the blocking surface 1112, so that the locking member 120 can be smoothly rotated and inserted into the locking groove 2201 to lock the connecting portion 220 in the mounting cavity 111.

[0067] It can be understood that in other embodiments of the present invention, the inner wall of the installation cavity is further provided with a vertically extending blocking groove, the lower end of the blocking groove is closed, and the bottom wall of the blocking groove forms a blocking surface, and the connecting part is provided with an anti-fall protrusion on the side away from the lock groove, and the bottom surface of the anti-fall protrusion forms an anti-fall surface. After the connecting part is inserted into place, the anti-fall protrusion is inserted into the blocking groove, thereby preventing the trailer hook from falling by hanging on the blocking surface through the anti-fall surface.

[0068] Preferably, Figures 6 to 9As shown, the locking member 120 in this embodiment is slidably mounted on the rotating shaft 130, the arc surface of the locking member 120 forms a first conical arc surface 121, and the locking groove 2201 has a second conical arc surface 22010, the first conical arc surface 121 and the second conical arc surface 22010 have the same inclination direction, the axis of the first conical arc surface 121, the axis of the second conical arc surface 22010 and the rotation axis of the locking member 120 (that is, the axis of the rotating shaft 130) are coaxial, the generatrix of the two conical arc surfaces is inclined relative to the axis of the rotating shaft 130, and the distance between the two conical arc surfaces and the axis of the rotating shaft 130 gradually increases toward the direction approaching the first through hole 112, and the torsion spring is a retractable torsion spring so that the locking member 120 can elastically float along the axial direction of the rotating shaft 130. When the locking member 120 is inserted into the locking groove 2201, the first conical arc surface 121 cooperates with the second conical arc surface 22010 to lock the connecting portion 220 in the mounting cavity 111. After the locking member 120 is inserted into the locking groove 2201, if the locking member 120 and the locking groove 2201 have a clearance fit or an interference fit due to manufacturing tolerances, the locking member 120 will move along the axis of the rotating shaft 130 under the joint action of the torsion spring and the second conical arc surface 22010. Since the first conical arc surface 121 and the second conical arc surface 22010 are both inclined relative to the axis of the rotating shaft 130, the movement of the locking member 120 will cause the first conical arc surface 121 and the second conical arc surface 22010 to come into contact, that is, the first conical arc surface 121 and the second conical arc surface 22010 achieve a zero-clearance fit to lock the connecting portion. 220 prevents the connecting portion 220 from shaking up and down, thereby improving the mounting performance of the trailer coupler; in addition, the first conical arc surface 121 and the second conical arc surface 22010 are both conical arc surfaces, and the first conical arc surface 121 and the second conical arc surface 22010 can also achieve surface contact, thereby increasing the contact area of ​​the first conical arc surface 121 and the second conical arc surface 22010, thereby increasing the friction between the locking member 120 and the connecting portion 220, and improving the locking effect of the connecting portion 220; finally, such a design can also reduce the manufacturing accuracy of the locking member 120 and the locking groove 2201, thereby reducing manufacturing costs and improving economic benefits.

[0069] It can be understood that in other embodiments of the present invention, the distance between the two conical arc surfaces and the axis of the rotating shaft can gradually decrease toward the direction approaching the first perforation. Such a design can also achieve the inclined setting of the first conical arc surface and the second conical arc surface relative to the axis of the rotating shaft.

[0070] like Figure 8As shown, in order to prevent the locking member 120 from being installed upside down, the locking member 120 in this embodiment also includes an anti-foolproofing boss 124, which is protruding from the fan surface of the fan-shaped plate facing the first through-hole 112. The anti-foolproofing boss 124 is sleeved on the outside of the rotating shaft 130, and the mounting port 114 includes a main opening 1141 and an anti-foolproofing port 1142. The anti-foolproofing port 1142 is provided on the side of the main opening 1141 facing the first through-hole 112 and is connected to the main opening 1141. When the locking member 120 is assembled, the fan-shaped plate is installed into the mounting cavity 111 through the main opening 1141, and the anti-foolproofing boss 124 is installed into the mounting cavity 111 through the anti-foolproofing port 1142. Such a design can prevent the locking member 120 from being installed upside down, which would cause the first conical arc surface 121 to be unable to cooperate with the second conical arc surface 22010, and thus cause the trailer hook 200 to be unable to be assembled to the mounting base 100, thereby avoiding rework due to incorrect installation and improving the assembly efficiency of the mounting base 100 and the trailer connector.

[0071] It can be understood that in other embodiments of the present invention, the anti-foolproof boss can also be protruded on the fan surface of the fan-shaped plate facing the second perforation, and the anti-foolproof mouth is provided on the side of the main opening facing the second perforation and is connected with the main opening. When the locking piece is assembled, the fan-shaped plate is installed in the installation cavity through the main opening, and the anti-foolproof boss is installed in the installation cavity through the anti-foolproof mouth. Such a design can also prevent the locking piece from being installed upside down.

[0072] Finally, if Figure 7 and Figure 11 As shown, in order to enable the unlocking push rod 230 to drive the locking member 120 to rotate upward smoothly and disengage from the lock groove 2201, the mounting seat 100 in this embodiment also includes a lifting push rod 170. The two lifting push rods 170 pass through the bottom wall of the groove 117 and extend into the mounting cavity 111. The two lifting push rods 170 are symmetrically distributed on both sides of the second through-hole 113. The sealing cover 160 blocks the two lifting push rods 170 while also limiting the axial position of the lifting push rod 170 to prevent the lifting push rod 170 from moving axially and falling off. Two avoidance grooves 123 are also provided on the fan surface of the side of the locking member 120 facing the second through-hole 113. The avoidance groove 123 is an arc-shaped groove, and the end of the lifting push rod 170 extending into the mounting cavity 111 is a spherical head surface. When the locking member 120 is inserted into the locking groove 2201, the lifting push rod 170 is inserted into the avoidance groove 123. When the locking member 120 rotates upward, the lifting push rod 170 will disengage from the avoidance groove 123 and abut against the side fan surface of the locking member 120 toward the second through hole 113, so as to drive the locking member 120 to move along the axial direction of the rotating shaft 130 in the direction away from the lifting push rod 170 and at least partially locate outside the locking groove 2201, thereby reducing the contact between the first conical arc surface 121 and the second conical arc surface 22010 or even disengaging the contact. The smaller the contact area between the first conical arc surface 121 and the second conical arc surface 22010, the easier it is for the locking member 120 to disengage from the locking groove 2201 when rotating, thereby making the disassembly of the trailer hook 200 more labor-saving.

[0073] It should be noted that when the connecting portion 220 is locked in the installation cavity 111 by the locking member 120, the connecting portion 220 is not completely locked and cannot move. A margin of movement is reserved between the inner wall of the installation cavity 111 opposite the locking member 120 and the connecting portion 220. This margin of movement allows the locking member 120 to move toward the inner wall of the installation cavity opposite the locking member 120 when it is pushed by the lifting push rod 170 and deflected axially, thereby smoothly reducing the contact between the first tapered arc surface 121 and the second tapered arc surface 22010. However, the reserved margin of movement does not affect the normal engagement of the locking member 120 with the locking groove 2201.

[0074] It can be understood that in other embodiments of the present invention, the avoidance groove can also be provided on the inner wall of the installation cavity, and the lifting push rod is installed on the fan surface of the fan plate facing the second perforation. Such a design can also force the locking member to move axially away from the second perforation by lifting the push rod out of the avoidance groove when the locking member rotates, thereby reducing the contact between the first conical arc surface 121 and the second conical arc surface 22010 or even losing contact.

[0075] Example 2

[0076] Compared with the first embodiment, the difference of this embodiment is that: the unlocking push rod is provided with a rack portion, and the manual operation assembly also includes a gear and a knob. The gear is installed in the cavity and meshes with the tooth portion. The knob is connected to the gear. By rotating the knob, the gear is driven to rotate to drive the unlocking push rod to move up and down. When the trailer hook needs to be disassembled, the knob is rotated to drive the gear to rotate to drive the unlocking push rod to move upward, thereby pushing the locking piece to rotate upward and disengage from the lock slot, thereby releasing the lock of the locking piece on the connecting portion. After the disassembly is completed, the knob can be rotated in the opposite direction to move the unlocking push rod downward and reset, so as to avoid the unlocking push rod interfering with the locking piece and rotating downward when the trailer hook and the mounting base are assembled again, so that it cannot be stuck in the lock slot.

[0077] It is understandable that in other embodiments of the present invention, the gear may also be connected to a motor, so that electric unlocking can be achieved.

[0078] Example 3

[0079] Compared with the first and second embodiments, the difference of this embodiment is that: the unlocking device includes an unlocking screw and an operating part fixedly connected to the lower end of the unlocking screw, the connecting part is provided with a vertically extending threaded hole, and the unlocking screw is threadedly connected to the threaded hole. With such a design, when the trailer hook needs to be disassembled, the rotating operating part can move the unlocking screw upward to push the locking part to rotate upward and disengage from the lock groove, thereby releasing the lock of the locking part on the connecting part. After the disassembly is completed, the reverse rotation of the operating part can move the unlocking screw downward and reset it, so as to avoid the unlocking screw interfering with the locking part and rotating downward when the trailer hook and the mounting base are assembled again, so that it cannot be stuck in the lock groove.

[0080] Example 4

[0081] Compared with the first to third embodiments, this embodiment differs in that the locking member is rotatably mounted on the side of the insert block facing away from the blocking surface. In this case, a clearance hole is provided on the insert block below the locking member's rotation axis, and a locking slot is provided on the inner wall of the mounting cavity. When the connecting portion is inserted into the mounting cavity, the locking member rotates downward about the rotation axis into the clearance hole. When the connecting portion is properly assembled, the locking member rotates upward under the torsion force of the torsion spring and snaps into the locking slot, locking the connecting portion in the mounting cavity. If the trailer hook needs to be removed for storage, the unlocking push rod is driven upward, enters the mounting cavity, and pushes the locking member to rotate upward and disengage the locking slot, thereby releasing the locking member from locking the connecting portion.

[0082] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A trailer coupler comprising a mounting seat, a trailer hook, a locking member, and an unlocking device, wherein the mounting seat is provided with a downwardly open mounting cavity, the trailer hook comprises a hooking portion and a connecting portion fixedly connected to the hooking portion, the locking member has a locking state for locking the connecting portion within the mounting cavity and an unlocking state for releasing the locking of the connecting portion, the unlocking device is used to drive the locking member to switch it from the locked state to the unlocked state, and is characterized in that: The inner wall of the installation cavity is provided with a blocking surface, and the connecting part is provided with an anti-falling surface. When the locking piece is in the unlocked state, the anti-falling surface can be hung on the blocking surface to prevent the trailer hook from falling. The installation cavity is also provided with a guide inclined surface inclined from bottom to top toward the blocking surface. The guide inclined surface is used to guide the connecting part to move toward the blocking surface when inserted, so that the anti-falling surface is located above the blocking surface.

2. The trailer coupler according to claim 1, wherein A vertically extending anti-fall groove is provided on one side of the connecting portion, the upper end of the anti-fall groove is closed, the top wall of the anti-fall groove forms the anti-fall surface, and the inner wall of the mounting cavity is provided with a blocking block inserted into the anti-fall groove, and the top surface of the blocking block forms the blocking surface.

3. The trailer coupler according to claim 2, wherein: The lower end of the anti-falling groove is closed, and the lower end of the anti-falling groove is located in the installation cavity.

4. The trailer coupler according to claim 1, wherein: The inner wall of the mounting cavity is provided with a vertically extending blocking groove, the lower end of the blocking groove is closed, the bottom wall of the blocking groove forms the blocking surface, and one side of the connecting part is provided with an anti-falling protrusion inserted into the blocking groove, and the bottom surface of the anti-falling protrusion forms the anti-falling surface.

5. The trailer coupler according to claim 1, wherein: The anti-falling surface is an inclined surface extending obliquely downward, and the blocking surface extends obliquely upward toward the inside of the installation cavity to cooperate with the inclined surface.

6. The trailer coupler according to claim 1, wherein: The side of the connecting portion facing away from the blocking surface is locked in the installation cavity by a locking piece, and the guiding inclined surfaces are arranged on both sides of the locking piece.

7. The trailer coupler according to any one of claims 1 to 5, characterized in that The connecting portion includes a main body and an insert block provided on the top of the main body, the insert block and the top of the main body form an avoidance step, the anti-falling surface is provided on the side of the insert block opposite to the avoidance step, when the locking piece is in a locked state, the first gap between the anti-falling surface and the blocking surface is greater than the depth of the transverse surface of the avoidance step extending into the installation cavity, and there is a second gap between the vertical surface of the avoidance step and the inner wall of the installation cavity, when the locking piece is in an unlocked state, the anti-falling surface moves downward to eliminate the first gap and then moves in a direction away from the blocking surface to eliminate the second gap to avoid the blocking surface, so that the connecting portion is removed from the installation cavity.

8. The trailer coupler according to any one of claims 1 to 5, characterized in that The locking member is rotatably installed in the installation cavity, and a locking groove is provided on the side of the connecting portion facing away from the blocking surface. When the locking member is in a locked state, the locking member is stuck in the locking groove, and when the locking member is in an unlocked state, the locking member is disengaged from the locking groove.

9. The trailer coupler according to any one of claims 1 to 5, characterized in that The unlocking device includes an unlocking push rod and a manual operation component. The unlocking push rod is vertically slidably installed on the connecting part, and the manual operation component drives the unlocking push rod to move upward into the installation cavity to switch the locking member to the unlocked state.

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