Self-locking trailer arm

Abstract

The utility model discloses a self -locking trailer arm, including connecting rod and trailer arm body, the utility model discloses a trailer arm simple structure, and operation is very convenient, and the trailer arm body is the integral structure with connecting rod and does not need to dismantle and use, when using, can be inserted into trailer insertion buckle mouth with the rotation of unlocking knob, and the self -locking is completed with the release of unlocking knob, and the trailer arm avoids the problem of swing, inclination and vibration of trailer arm in the movement.

Description

Technical Field

[0001] This utility model relates to the field of vehicle traction device technology, and in particular to a self-locking trailer arm. Background Technology

[0002] A trailer boom is a type of attachment that is installed at one end into a standard quick-connect square slot in the trailer bar of a vehicle chassis, and at the other end has a specific towing interface, serving a connecting function. It is mainly used for connecting and towing trailers, disabled vehicles, and other towing and carrying goods.

[0003] However, most trailer booms on the market have a design flaw where the locking pin (the part that connects to the tractor) is separate from the main body. This makes them easy to lose and the installation and disassembly process is cumbersome and time-consuming, greatly reducing the user experience. Utility Model Content

[0004] The purpose of this invention is to provide a self-locking trailer arm to solve the problems mentioned in the background section.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A self-locking trailer arm includes a connecting rod and a trailer arm body. The trailer arm body is fixedly connected to one end of the connecting rod. A self-locking assembly is provided inside the connecting rod. The self-locking assembly includes a base, an unlocking knob, a rack, a transmission rod, and a pin. A rotating rod is fixedly connected to the bottom of the unlocking knob. A gear is sleeved on the rotating rod and meshes with the rack. The transmission rod includes a reset section and a retraction section. A reset spring is sleeved on the reset section. A sleeve is vertically sleeved on the retraction section away from the reset section. The pin is installed at both ends of the sleeve. An arc plate is provided at the end of the pin near the retraction section. A fixing post is provided on the pin. The two fixing posts of the pin are connected by a tension spring. A slope extending from the middle to both sides and from the retraction section to the reset section is provided at the end of the retraction section away from the reset section. The arc plate abuts against the slope. A through hole is provided on the side of the connecting rod at a position corresponding to the pin.

[0007] Furthermore, a limiting ring is provided on the outer side of the connecting rod, and a set screw is provided on the limiting ring.

[0008] Furthermore, a first limiting groove is provided on the side wall of the connecting rod, and the set screw is inserted into the first limiting groove.

[0009] Furthermore, a limiting tube is provided on the outer side of the slope, and a second limiting groove is provided on both sides of the limiting tube, into which the arc plate is inserted.

[0010] Furthermore, a limiting block is fixedly provided on the base, a convex ring is provided between the reset section and the retraction section, the rack passes through the limiting block, one end of the rack is stuck on the convex ring, and the other end of the rack passes through the side of the base near the trailer arm body.

[0011] Furthermore, a sealing plate is provided at the end of the connecting rod away from the trailer arm body, and the sealing plate is fixedly connected to the connecting rod by screws.

[0012] Furthermore, the rack is a perforated rack.

[0013] Beneficial effects:

[0014] The trailer arm of this utility model has a simple structure and is very convenient to use. The trailer arm body and the connecting rod are an integral structure and do not need to be disassembled. When in use, simply rotate the unlocking knob to insert the connecting rod into the trailer buckle. Releasing the unlocking knob will complete the self-locking. This trailer arm avoids the problems of swaying, tilting and vibration during the movement of the trailer arm. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the self-locking component in this utility model;

[0017] Figure 3 This is a partial structural diagram of the self-locking component in this utility model;

[0018] Figure 4 This is a cross-sectional view of the present invention.

[0019] The following are the labels in the diagram: 1. Connecting rod; 2. Trailer arm body; 3. Unlock knob; 4. Limit ring; 5. Set screw; 6. First limit groove; 7. Through hole; 8. Sealing plate; 9. Base; 10. Gear; 11. Rack; 12. Reset section; 13. Retracting section; 14. Pin; 15. Fixing post; 16. Slope; 17. Rotating rod; 18. Tension spring; 19. Sleeve; 20. Locking strip; 21. Limit block; 22. Limit tube; 23. Second limit groove; 24. Reset spring. Detailed Implementation

[0020] In the description of this embodiment, it should be noted that the terms "upper," "lower," "inner," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, unless otherwise expressly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0021] In addition, unless otherwise specified, the components used in the following embodiments are all existing components, and their corresponding connection methods can also be achieved through conventional technical means, which will not be described in detail in this application. The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example

[0023] This embodiment provides a self-locking trailer arm, including a connecting rod 1 and a trailer arm body 2. The trailer arm body 2 is fixedly connected to one end of the connecting rod 1. A self-locking assembly is provided inside the connecting rod 1. The self-locking assembly includes a base 9, an unlocking knob 3, a rack 11, a transmission rod, and a pin 14. A rotating rod 17 is fixedly connected to the bottom of the unlocking knob 3. A gear 10 is sleeved on the rotating rod 17 and meshes with the rack 11. The transmission rod includes a reset section 12 and a retraction section 13. A reset spring 24 is sleeved on the reset section 12 and the retraction section... A sleeve 19 is vertically sleeved at the end of the connecting rod 1 away from the reset section 12. Pins 14 are installed at both ends of the sleeve 19. An arc plate is provided at the end of the pin 14 near the contraction section 13. A fixing post 15 is provided on the pin 14. The fixing posts 15 of the two pins 14 are connected by a tension spring 18. A slope 16 is provided at the end of the contraction section 13 away from the reset section 12, extending from the middle to both sides and from the contraction section 13 to the reset section 12. The arc plate abuts against the slope 16. A through hole 7 is provided on the side of the connecting rod 1 at the position corresponding to the pin 14.

[0024] Specifically, the self-locking trailer arm in this embodiment includes a connecting rod 1 and a trailer arm body 2 connected together. A self-locking component is provided inside the connecting rod 1 to achieve the self-locking function. Specifically, a base 9 with an opening at the top is installed inside the connecting rod 1. The side of the base 9 along its length is fixedly connected to the side wall of the connecting rod 1 by screws. A rotating rod 17 is rotatably installed inside the end of the base 9 near the trailer arm body 2. A gear 10 is fitted on the rotating rod 17. The top of the rotating rod 17 passes through the upper wall of the connecting rod 1 and is fixedly connected to an unlocking knob 3. The internal gear 10 meshes with a rack 11, so that the unlocking knob 3 can be rotated from the outside of the connecting rod 1 to pull the rack 11 and make it move laterally. Inside the base 9, there is a transmission rod divided into two sections. The section near the unlocking knob 3 is a reset section 12, on which a reset spring 24 is fitted. The other section is a retraction section 13, which passes through one side of the base 9 and has a sleeve 19 vertically fitted at its end. Pins 14 are inserted into the two ends of the sleeve 19. A through hole 7 for the pins 14 to extend and retract is provided on the side of the connecting rod 1. One side of the pin 14 is an arc section, with a slope 16 on the surface of the retraction section 13. The arc section rests against the slope 16. Fixing posts 15 are provided on the upper and lower surfaces of the pin 14. One end of a tension spring 18 is connected to the fixing post 15 of one side of the pin 14, and the other end is connected to the fixing post 15 of the other side of the pin 14. The tension spring 18 allows the pins 14 on both sides to move towards the middle. One end of the rack 11 is connected to the transmission rod, so that when the rack 11 moves laterally, it can drive the transmission rod to move laterally as well. The trailer arm body 2 also includes components such as a towing ball, which are the same as the existing trailer arm structure and will not be described in detail here.

[0025] Preferably, a limiting ring 4 is provided on the outer side of the connecting rod 1, and a set screw 5 is provided on the limiting ring 4. A first limiting groove 6 is provided on the side wall of the connecting rod 1, and the set screw 5 is inserted into the first limiting groove 6.

[0026] Specifically, the limiting ring 4 can slide on the outer wall of the connecting rod 1. When the connecting rod 1 is inserted into the traction interface of the tractor, the limiting ring 4 can slide to a suitable position, and then the set screw 5 is tightened to fix the position of the limiting ring 4. A first limiting groove 6 is also provided to limit the movement distance of the limiting ring 4 within the limiting groove.

[0027] Preferably, a limiting tube 22 is provided on the outer side of the slope 16, and a second limiting groove 23 is provided on both sides of the limiting tube 22. The arc plate is inserted into the second limiting groove 23, so that the arc plate can only move laterally within the second limiting groove 23 and will not accidentally move up and down and detach from the slope 16.

[0028] Preferably, a limiting block 21 is fixedly provided on the base 9, a convex ring is provided between the reset section 12 and the retraction section 13, the rack 11 passes through the limiting block 21, and one end of the rack 11 is locked on the convex ring. Specifically, the end of the rack 11 is right-angled, and its right-angled side can be locked on the convex ring. The other end of the rack 11 passes through the side of the base 9 near the trailer arm body 2, and a retaining strip 20 is provided at the end of the rack 11 to prevent the rack 11 from disengaging from the side of the base 9.

[0029] Specifically, the limiting block 21 has slots on both sides, which are used to lock onto the sides of the base 9. The limiting block 21 has a mounting hole in the middle for the rack 11 and the transmission rod to pass through, thereby limiting the position of the rack 11 and the transmission rod, so that they can move laterally and not deviate from the movement trajectory.

[0030] Preferably, a sealing plate 8 is provided at the end of the connecting rod 1 away from the trailer arm body 2, and the sealing plate 8 is fixedly connected to the connecting rod 1 by screws. The sealing plate 8 encapsulates the self-locking component inside the connecting rod 1, preventing it from being exposed to the outside and thus avoiding easy damage.

[0031] Preferably, the rack 11 is a perforated rack 11, and the teeth of the gear 10 are inserted into the perforated rack 11 to lock the position of the rack 11. The hole can be used as a positioning reference to control the movement distance of the transmission rod.

[0032] Working principle:

[0033] When idle, the return spring 24 of the reset section 12 is stretched so that one end of the rack 11 with the retaining strip 20 abuts against the side of the base 9, the transmission rod is closer to the sealing plate 8, and the slope 16 pushes the arc section of the pin 14 outward, so that the pin 14 passes through the through hole 7 and is exposed on the outside of the connecting rod 1.

[0034] When needed, first turn the unlocking knob 3, which moves the rack 11 towards the trailer arm body 2. Simultaneously, the rack 11 moves the transmission rod towards the trailer arm body 2. At this time, the return spring 24 is compressed. The movement of the retractable section 13 causes the slope 16 to move further away from the arc segment of the pin 14, thus preventing it from pushing outwards. The tension spring 18 then pulls the pin 14 towards the center, ultimately causing it to retract into the through hole 7 of the connecting rod 1, preventing it from being exposed on the outside of the connecting rod 1. Then, insert the connecting rod 1 into the tractor's towing interface. Release the unlocking knob 3, and the return spring 24 returns to its original length, moving the rack 11 towards the sealing plate 8. The rack 11 moves the transmission rod, causing the slope 16 of the retractable section 13 to push the pin 14 outwards again, locking it into the insertion port of the towing interface, completing the fixed connection.

[0035] Although the embodiments of this utility model have been described in the specification, these embodiments are merely illustrative and should not limit the scope of protection of this utility model. Various omissions, substitutions, and modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A self-locking trailer arm characterized by: The device includes a connecting rod and a trailer arm body. The trailer arm body is fixedly connected to one end of the connecting rod. A self-locking assembly is installed inside the connecting rod. The self-locking assembly includes a base, an unlocking knob, a rack, a transmission rod, and a pin. A rotating rod is fixedly connected to the bottom of the unlocking knob. A gear is sleeved on the rotating rod and meshes with the rack. The transmission rod includes a reset section and a retraction section. A reset spring is sleeved on the reset section. A sleeve is vertically sleeved on the retraction section at the end away from the reset section. The pin is mounted on both ends of the sleeve. An arc plate is provided at the end of the pin near the retraction section. A fixing post is provided on the pin. The two fixing posts of the pin are connected by a tension spring. A slope extending from the center to both sides and from the retraction section to the reset section is provided at the end of the retraction section away from the reset section. The arc plate abuts against the slope. A through hole is provided on the side of the connecting rod corresponding to the pin.

2. The self-locking trailer arm according to claim 1, characterized in that: A limiting ring is provided on the outer side of the connecting rod, and a set screw is provided on the limiting ring.

3. The self-locking trailer arm according to claim 2, characterized in that: A first limiting groove is provided on the side wall of the connecting rod, and the set screw is inserted into the first limiting groove.

4. The self-locking trailer arm according to claim 1, characterized in that: A limiting tube is provided on the outer side of the slope, and a second limiting groove is provided on both sides of the limiting tube. The arc plate is inserted into the second limiting groove.

5. The self-locking trailer arm according to claim 1, characterized in that: A limiting block is fixedly installed on the base, and a convex ring is provided between the reset section and the retraction section. The rack passes through the limiting block, and one end of the rack is stuck on the convex ring. The other end of the rack passes through the side of the base near the trailer arm body.

6. The self-locking trailer arm according to claim 1, characterized in that: The end of the connecting rod away from the trailer arm body is provided with a sealing plate, which is fixedly connected to the connecting rod by screws.

7. The self-locking trailer arm according to claim 1, characterized in that: The rack is a perforated rack.

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