A trailer hitch structure that facilitates unlocking

Abstract

The utility model relates to a trailer hook structure convenient to unlock belongs to trailer equipment technical field. Including a fixed on the car body's accepter and a with accepter's hook body of detachable connection, the hook body is set up with a lock hook in one end with accepter connection upward, the hook body is set up with a lock tongue sliding groove in the side of lock hook, the lock tongue sliding groove is set up with a lock tongue in the up and down sliding of inside, characteristics are: accepter is set up with the sliding block of cooperation with lock tongue rotation, when the lock tongue slides upward, forces the sliding block counterclockwise rotation and close lock tongue to realize the locking of hook body, when the lock tongue slides downward, the sliding block makes clockwise rotation and reduces the friction of lock tongue to realize the quick unlocking. Advantage: make the hook body in the more lock more tight condition also can quick unlock to reduce the unlocking difficulty, guarantee the fixed strength of hook body while reaching the purpose of quick unlocking.

Description

Technical Field

[0001] This utility model belongs to the field of trailer equipment technology, specifically relating to a trailer hook structure that is easy to unlock. Background Technology

[0002] The tow hook is the most important component for emergency rescue and towing operations between vehicles. When a vehicle is stuck due to a malfunction (such as engine stalling or brake failure) or is stuck in complex terrain (such as mud or sand), the tow hook can be used as a fulcrum to connect to the tow rope or tow bar, allowing the vehicle to get out of trouble using the power of other vehicles. At the same time, as a multi-functional interface, the tow hook can also expand the vehicle's functions, supporting the towing of luggage and outdoor equipment, such as towing caravans, yacht trailers, motorcycle transport racks, etc., thus expanding the vehicle's carrying capacity.

[0003] Currently, trailer hitches are mainly detachable and installable in the following ways: first, by fixing the hook body with a pin; second, by tightening the hook body with a thread; and third, by installing the hook body inside the receiver through a self-locking structure. The third type is the most convenient to install and the most reliable hook body structure, which can achieve quick installation and removal of the hook body while ensuring the fixing strength of the hook body. However, there are also some problems in actual use. For example, as the hook body is subjected to continuous force, its self-locking structure will become tighter and tighter, and when it is necessary to disassemble, the hook body is difficult to unlock, and the unlocking operation is very laborious.

[0004] In view of the aforementioned problems, it is necessary to design a trailer hitch structure that is simple in structure, low in cost, and can avoid the difficulty in unlocking after the self-locking structure is locked. To this end, the applicant has ingeniously designed this technical solution. Utility Model Content

[0005] The purpose of this invention is to provide a trailer hook structure that is easy to unlock. It helps to improve the receiver structure so that the hook can be quickly unlocked even when it is locked tighter, thereby reducing the difficulty of unlocking. It is beneficial to achieve the purpose of quick unlocking while ensuring the fixing strength of the hook.

[0006] The purpose of this utility model is to provide an easy-to-unlock trailer hitch structure, comprising a receiver fixed to the vehicle body and a hook body detachably connected to the receiver. The hook body has a locking hook at one end connected to the receiver, and a locking tongue groove is formed beside the locking hook. A locking tongue is slidably disposed within the locking tongue groove. The key feature is that a slider cooperating with the locking tongue is rotatably disposed on the receiver. When the locking tongue slides upward, it forces the slider to rotate counterclockwise and press against the locking tongue, thereby locking the hook body. When the locking tongue slides downward, the slider rotates clockwise to reduce the friction on the locking tongue, thus achieving quick unlocking.

[0007] In a specific embodiment of this utility model, the receiver has a vertically penetrating receiving cavity. One edge of the upper end of the receiving cavity forms a locking platform that cooperates with the locking hook. The slider is disposed on the other side of the upper end of the receiving cavity. The slider is rotatably supported in the receiving cavity by a slider shaft. The front and rear ends of the slider shaft are respectively connected to the front and rear side walls of the receiver. There is a gap between the slider and the left side wall of the receiving cavity to allow the slider to rotate. A slider inclined surface is formed on the side of the slider that contacts the locking tongue. The upper end of the locking tongue forms a locking tongue inclined surface for cooperating with the slider inclined surface.

[0008] In another specific embodiment of this utility model, the receiver has a receiver mounting hole, and the receiver is fixedly connected to the vehicle body through the receiver mounting hole.

[0009] In another specific embodiment of this utility model, a latch return spring is provided at the bottom of the latch slide groove, a latch return spring cavity is formed at the lower end of the latch, the lower end of the latch return spring abuts against the bottom of the latch slide groove, and the upper end of the latch return spring is nested in the latch return spring cavity and abuts against the top of the latch return spring cavity.

[0010] In another specific embodiment of this utility model, the hook body has a drive gear hole that communicates with the lock tongue groove in the front-back direction at a position tangent to the lock tongue groove. A drive gear is rotatably supported in the drive gear hole. A lock tongue rack is formed along the length direction on the side of the lock tongue facing the drive gear hole. The drive gear meshes with the lock tongue rack. One end of the drive gear passes through the hook body and forms a rotating end.

[0011] In another specific embodiment of this utility model, a locking tongue limiting groove is provided in the middle of the locking tongue, and a limiting screw is fixed on the hook body at the position corresponding to the locking tongue limiting groove. The limiting screw passes through the hook body and extends into the locking tongue limiting groove.

[0012] In a further specific embodiment of this utility model, a positioning pin is protruding and fixed near the end of the lock hook, the receiver has a positioning pin hole at the position corresponding to the positioning pin, the lock hook has a positioning steel ball at the position corresponding to the positioning pin hole and facing the lock tongue, and the lock tongue has a positioning steel ball groove at the position corresponding to the positioning steel ball. When the lock tongue slides down until the positioning steel ball is embedded in the positioning steel ball groove, it indicates that the lock is unlocked.

[0013] In a further specific embodiment of this utility model, the width of the receiving cavity is greater than the width of the hook extending into the receiving cavity.

[0014] The present invention has the following advantages after adopting the above structure: due to the use of a structure in which a rotating slider and a locking tongue cooperate, the locking tongue can increase the contact surface to increase friction and thus improve the locking strength when locking with the slider. At the same time, the locking tongue can reduce the contact surface to reduce friction and thus reduce the difficulty of unlocking when unlocking with the slider, effectively ensuring the fixing strength of the hook and achieving the purpose of quick unlocking. Attached Figure Description

[0015] Figure 1 This is a side sectional view of the unlocked state according to an embodiment of the present invention; Figure 2 This is a side sectional view of the locked state according to an embodiment of the present invention.

[0016] In the diagram: 1. Receiver, 11. Receiver cavity, 12. Locking platform, 13. Receiver mounting hole, 14. Positioning pin hole; 2. Hook body, 21. Lock hook, 211. Positioning pin, 212. Positioning steel ball, 22. Lock tongue groove, 221. Lock tongue, 2211. Lock tongue inclined surface, 2212. Lock tongue rack, 2213. Lock tongue return spring cavity, 2214. Lock tongue limiting groove, 2215. Positioning steel ball groove, 222. Lock tongue return spring, 23. Drive gear hole, 231. Drive gear, 24. Limiting screw; 3. Slider, 31. Slider shaft, 32. Slider inclined surface. Detailed Implementation

[0017] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0018] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are based on... Figure 1 The positions shown are for reference only and should not be construed as a particular limitation on the technical solutions provided by this utility model.

[0019] Please see Figure 1 and combined Figure 2 This utility model relates to a trailer hitch structure that is easy to unlock, including a receiver 1 fixed on the vehicle body and a hook body 2 that is detachably connected to the receiver 1. The hook body 2 has a locking hook 21 at the end connected to the receiver 1. A locking tongue groove 22 is provided on one side of the locking hook 21. A locking tongue 221 is slidably disposed in the locking tongue groove 22.

[0020] The technical innovation of this utility model is as follows: a slider 3 that cooperates with the locking tongue 221 is rotatably arranged on the aforementioned receiver 1. When the locking tongue 221 slides upward, it forces the slider 3 to rotate counterclockwise and stick to the locking tongue 221, thereby locking the hook body 2. When the aforementioned locking tongue 221 slides downward, the aforementioned slider 3 rotates clockwise to reduce the friction force on the locking tongue 221 and achieve quick unlocking.

[0021] Please see Figure 1 The aforementioned receiver 1 has a vertically penetrating receiving cavity 11. A locking platform 12, which engages with the locking hook 21, is formed on one edge of the upper end of the receiving cavity 11. A slider 3 is disposed on the other side of the upper end of the receiving cavity 11. The slider 3 is rotatably supported within the receiving cavity 11 by a slider shaft 31. The front and rear ends of the slider shaft 31 are connected to the front and rear side walls of the receiver 1, respectively. A gap exists between the slider 3 and the left side wall of the receiving cavity 11 to allow the slider 3 to rotate. A slider inclined surface 32 is formed on the side of the slider 3 that contacts the locking tongue 221. A locking tongue inclined surface 2211 is formed at the upper end of the locking tongue 221 to engage with the slider inclined surface 32. The receiver 1 has a receiver mounting hole 13, through which it is fixedly connected to the vehicle body. The width of the receiving cavity 11 is greater than the width of the hook 2 extending into the receiving cavity 11.

[0022] Please see Figure 1 and Figure 2 A latch return spring 222 is provided at the bottom of the aforementioned latch slide groove 22. A latch return spring cavity 2213 is formed at the lower end of the aforementioned latch 221. The lower end of the aforementioned latch return spring 222 abuts against the bottom of the latch slide groove 22, and the upper end of the aforementioned latch return spring 222 is nested in the latch return spring cavity 2213 and abuts against the top of the latch return spring cavity 2213.

[0023] Furthermore, the hook body 2 has a drive gear hole 23 connected to the lock tongue groove 22 at a position tangent to it in the front-back direction. A drive gear 231 is rotatably supported in the drive gear hole 23. A lock tongue rack 2212 is formed along the length direction on the side of the lock tongue 221 facing the drive gear hole 23. The drive gear 231 meshes with the lock tongue rack 2212. One end of the drive gear 231 extends out of the hook body 2 and forms a rotating end. In actual operation, the rotating end of the drive gear 231 is rotated by the handle, causing the drive gear 231 to drive the lock tongue rack 2212 to slide, thereby causing the lock tongue 221 to move up and down.

[0024] A locking tongue limiting groove 2214 is provided in the middle of the aforementioned locking tongue 221. A limiting screw 24 is fixed at the position corresponding to the locking tongue limiting groove 2214 of the aforementioned hook body 2. The aforementioned limiting screw 24 passes through the hook body 2 and extends into the locking tongue limiting groove 2214.

[0025] A positioning pin 211 is protruding and fixed near the end of the aforementioned lock hook 21. The aforementioned receiver 1 has a positioning pin hole 14 at the position corresponding to the positioning pin 211. A positioning steel ball 212 is provided on the lock hook 21 at the position corresponding to the positioning pin hole 14 and facing the lock tongue 221. A positioning steel ball groove 2215 is provided on the lock tongue 221 at the position corresponding to the positioning steel ball 212. When the aforementioned lock tongue 221 slides down until the positioning steel ball 212 is embedded in the positioning steel ball groove 2215, it indicates that the lock is unlocked.

[0026] Please see Figure 1 and Figure 2 When the tow hook is needed, the aforementioned receiver 1 is pre-fixed to the vehicle body through the receiver mounting hole 13. The hook body 2, with one end having a locking hook 21, is inserted into the receiving cavity 11 from bottom to top. The aforementioned positioning pin 211 is inserted into the positioning pin hole 14, causing the locking hook 21 to hook onto the locking platform 12. Then, by rotating the aforementioned drive gear 231 through the operating handle, the locking tongue rack 2212 slides upward, thereby causing the locking tongue 221 to insert upward into the position between the slider 3 and the locking hook 21. At this time, the aforementioned The latching tongue inclined surface 2211 contacts the slider 3. As the latching tongue inclined surface 2211 rubs against the slider 3, the slider 3 rotates counterclockwise around the slider shaft 31 by a certain angle until the latching tongue inclined surface 2211 and the slider inclined surface 32 are completely attached and the space between the slider 3 and the locking platform 12 is tightened. When the tow hook is not needed, the aforementioned drive gear 231 is rotated by operating the handle to make the latching tongue rack 2212 slide downward, thereby causing the latching tongue 221 to be inserted downward into the latching tongue groove 22 and separated from the slider 3. After the trailer hook has been used, the locking tongue 221 and the slider 3 are locked very tightly, and the friction is very large. When the locking tongue 221 moves downward, the friction causes the slider 3 to rotate clockwise around the slider shaft 31 by a certain angle, which reduces the contact area between the locking tongue 221 and the slider 3, thereby reducing the friction. The locking tongue 221 continuously compresses the locking tongue return spring 222 downward until the positioning steel ball 212 is embedded in the positioning steel ball groove 2215, indicating that the unlocking is in place. Finally, the hook body 2 is separated from the receiver 1 from top to bottom by continuously changing the angle.

[0027] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

[0028] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the invention task, and accurately realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A trailer hitch structure for easy unlocking, comprising a receiver (1) fixed to a vehicle body and a hook body (2) detachably connected to the receiver (1), wherein the hook body (2) has a locking hook (21) extending upward at the end connected to the receiver (1), and a locking tongue groove (22) is provided on one side of the locking hook (21) of the hook body (2), wherein a locking tongue (221) is slidably disposed within the locking tongue groove (22), characterized in that... The receiver (1) is rotatably provided with a slider (3) that cooperates with the locking tongue (221). When the locking tongue (221) slides upward, it forces the slider (3) to rotate counterclockwise and press against the locking tongue (221) to lock the hook (2). When the locking tongue (221) slides downward, the slider (3) rotates clockwise to reduce the friction force on the locking tongue (221) to achieve quick unlocking.

2. The trailer hitch structure for easy unlocking according to claim 1, characterized in that: The receiver (1) has a vertically penetrating receiving cavity (11). The upper edge of the receiving cavity (11) forms a locking platform (12) that cooperates with the locking hook (21). The slider (3) is located on the other side of the upper end of the receiving cavity (11). The slider (3) is rotatably supported in the receiving cavity (11) by a slider shaft (31). The front and rear ends of the slider shaft (31) are respectively connected to the front and rear side walls of the receiver (1). There is a gap between the slider (3) and the left side wall of the receiving cavity (11) to allow the slider (3) to rotate. The side surface of the slider (3) that contacts the locking tongue (221) forms a slider inclined surface (32). The upper end of the locking tongue (221) forms a locking tongue inclined surface (2211) for cooperating with the slider inclined surface (32).

3. The trailer hitch structure for easy unlocking according to claim 1, characterized in that: The receiver (1) has a receiver mounting hole (13) and the receiver (1) is fixedly connected to the vehicle body through the receiver mounting hole (13).

4. The trailer hitch structure for easy unlocking according to claim 1, characterized in that: A latch return spring (222) is provided at the bottom of the latch slide groove (22), and a latch return spring cavity (2213) is formed at the lower end of the latch (221). The lower end of the latch return spring (222) abuts against the bottom of the latch slide groove (22), and the upper end of the latch return spring (222) is nested in the latch return spring cavity (2213) and abuts against the top of the latch return spring cavity (2213).

5. The trailer hitch structure for easy unlocking according to claim 1, characterized in that: The hook body (2) has a drive gear hole (23) that communicates with the lock tongue groove (22) in the front-back direction at a position tangent to the lock tongue groove (22). A drive gear (231) is rotatably supported in the drive gear hole (23). A lock tongue rack (2212) is formed along the length direction on the side of the lock tongue (221) facing the drive gear hole (23). The drive gear (231) meshes with the lock tongue rack (2212). One end of the drive gear (231) extends out of the hook body (2) and forms a rotating end.

6. The trailer hitch structure for easy unlocking according to claim 1, characterized in that: A locking tongue limiting groove (2214) is provided in the middle of the locking tongue (221). A limiting screw (24) is fixed on the hook body (2) at the position corresponding to the locking tongue limiting groove (2214). The limiting screw (24) passes through the hook body (2) and extends into the locking tongue limiting groove (2214).

7. The trailer hitch structure for easy unlocking according to claim 1, characterized in that: A positioning pin (211) protrudes and is fixed near the end of the lock hook (21). The receiver (1) has a positioning pin hole (14) at the position corresponding to the positioning pin (211). A positioning steel ball (212) is provided on the lock hook (21) at the position corresponding to the positioning pin hole (14) and facing the lock tongue (221). A positioning steel ball groove (2215) is provided on the lock tongue (221) at the position corresponding to the positioning steel ball (212). When the lock tongue (221) slides down until the positioning steel ball (212) is embedded in the positioning steel ball groove (2215), it means that the lock is unlocked.

8. The trailer hitch structure for easy unlocking according to claim 2, characterized in that: The width of the receiving cavity (11) is greater than the width of the hook (2) extending into the receiving cavity (11).

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