A rotatable and switchable multi-ball head trailer arm

Abstract

This utility model relates to a rotatable and switchable multi-ball joint trailer arm, including an arm body and a ball joint fixing seat disposed at one end of the arm body. A traction ball joint is mounted on the ball joint fixing seat. The ball joint fixing seat includes a connecting part and a fixing part, which are fixedly connected. The connecting part is cylindrical, and the arm body has a square annular structure. The connecting part is inserted into the inner ring of the arm body, and one end of the arm body abuts against the side of the fixing part. The connecting part can rotate relative to the arm body. An annular groove is provided on the connecting part, and an installation groove is provided on the arm body. A fixing block is disposed in the installation groove, and the bottom end of the fixing block is located in the annular groove, with the side wall of the fixing block abutting against the side wall of the annular groove. A locking pin is provided between the connecting part and the arm body to lock the selected traction ball joint in the working position. With this solution, quick, convenient, and safe switching between different ball joints on the trailer arm can be achieved without cumbersome overall disassembly, saving time and effort and greatly improving the user experience.

Description

Technical Field

[0001] This utility model relates to the technical field of vehicle traction connection devices, and in particular to a rotatable and switchable multi-ball head trailer arm. Background Technology

[0002] With the popularization of car culture and the rise of outdoor activities, more and more vehicles need to tow trailers, RVs, motorcycle racks, or bicycle racks. As the core connecting component between the vehicle and the towing equipment, the versatility and convenience of the trailer arm are crucial.

[0003] Currently, most commercially available trailer booms integrate two or three ball joints of different sizes or other types of hooks at their ends to accommodate towing equipment of different standards and requirements. While this design improves the applicability of a single trailer boom to some extent, it still has significant drawbacks in practical use: when users need to switch to different ball joints, they must first completely remove the entire trailer boom from the vehicle's trailer hitch mount, manually rotate the trailer boom to the desired ball joint position, and then reinstall and secure the trailer boom to the vehicle.

[0004] For those skilled in the art, a readily conceived solution would be to divide the trailer arm into two parts, the arm itself and the ball joint, connected by a rotatable joint and secured with a pin. However, in this configuration, the weight and impact force of the entire trailer depend entirely on the shear strength of a single pin. Even with locking measures, the structure lacks rigidity under complex loads and is highly susceptible to loosening. Furthermore, if the pin breaks due to metal fatigue or overload, the trailer arm will immediately detach, potentially leading to a serious accident. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a rotatable and switchable multi-ball head trailer arm, which aims to achieve quick, convenient and safe switching between different ball heads without the need for cumbersome overall disassembly.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0007] A rotatable and switchable multi-ball head trailer arm includes a boom body and a ball head fixing seat at one end of the boom body. A traction ball head is installed on the ball head fixing seat. The ball head fixing seat includes a connecting part and a fixing part, which are fixedly connected. The connecting part is cylindrical, and the boom body has a square annular structure. The connecting part is inserted into the inner ring of the boom body, and one end of the boom body abuts against the side of the fixing part. The connecting part can rotate relative to the boom body. An annular groove is provided on the connecting part, and an installation groove is provided on the boom body. A fixing block is provided in the installation groove. The bottom end of the fixing block is located in the annular groove, and the side wall of the fixing block abuts against the side wall of the annular groove. A locking pin is provided between the connecting part and the boom body to lock the selected traction ball head in the working position.

[0008] This solution enables rapid and convenient ball joint switching with extremely high operational efficiency. When users need to switch towing ball joints, there's no need to remove the entire trailer arm from the vehicle's square receiver. Simply pull out the locking pin, manually rotate the ball joint mounting base to bring the desired ball joint or trailer hook to the working position, and then insert the locking pin to complete the switch. The entire process takes only a few seconds, saving time and effort and greatly improving the user experience, making it particularly suitable for scenarios requiring frequent changes of towing equipment. In this design, the core axial load-bearing and limiting structure is formed by the precise fit between the annular groove on the connecting part and the fixing block in the arm mounting groove. After the bottom end of the fixing block is embedded in the annular groove, its sidewall abuts tightly against the sidewall of the annular groove, effectively transferring the downward pressure generated by the towing equipment and the impact force during braking from the ball joint mounting base to the fixing block, and then from the fixing block to the entire arm. This design avoids force concentration on the rotating shaft, and its load-bearing capacity far exceeds that of simple pin connections.

[0009] Furthermore, the arm body is equipped with positioning holes, and the connecting part has four fixing holes evenly spaced circumferentially. The locking pin is inserted into the fixing holes through the positioning holes to fix the arm body and the connecting part. The four evenly spaced fixing holes circumferentially correspond precisely to the positioning holes on the arm body. When the locking pin is inserted, a rigid connection is achieved between the ball joint fixing seat and the arm body. This connection method can effectively resist the huge torsional and impact forces generated during traction, preventing the ball joint fixing seat from rotating or wobbling slightly in any direction, ensuring the absolute stability and safety of traction operation. At the same time, the four evenly distributed fixing holes indicate that the ball joint fixing seat can be accurately positioned to a new working position every 90° rotation. This design provides a clear sense of gear shifting, and users do not need to visually observe or repeatedly adjust. They can quickly and accurately rotate the required ball joint and lock it to the standard working position by feel alone, significantly improving the convenience and efficiency of operation. In addition, the locking pin, as an independent fastener, can be further secured by cotter pins, R-clamps, or safety chains after insertion, and corresponding holes can be designed at the end of the locking pin. This creates a safety barrier that completely prevents the locking pin from falling off due to accidental vibration, even if the vehicle is subjected to severe bumps, providing users with double protection and making the safety factor higher.

[0010] Furthermore, the fixing part is square, with three different sizes of towing ball joints and a trailer hitch mounted circumferentially on it. Integrating three different sizes of towing ball joints and a trailer hitch on a single trailer arm allows it to be compatible with most common towing equipment on the market, and can also be used for rescue and towing. Users no longer need to purchase, carry, and replace multiple independent trailer arms for different tasks, greatly improving the equipment's versatility and convenience. Meanwhile, the four functional points are evenly distributed circumferentially, meaning that a function can be switched every 90° rotation. This design makes each workstation extremely clear and distinct, allowing users to easily judge whether the switch is in place by feel. Combined with the locking pin mechanism, precise and reliable positioning can be achieved, effectively preventing misoperation.

[0011] Furthermore, the fixing block is square, with its top end level with the boom. The fixing block is securely fastened within the mounting groove and annular groove. The square fixing block and the annular groove mate, with multiple planes forming a large surface contact with the sidewalls of the annular groove. When the trailer boom experiences significant downward pressure or impact forces from sudden braking, this force acts on the fixing block as a shear force. Compared to round pins, the square cross-section has a much larger shear-resistant area, evenly distributing the load and significantly improving the axial load-bearing capacity and impact resistance of the entire structure. This effectively prevents the connection from detaching from the boom, ensuring extremely high safety and reliability. In addition, the fixing block and mounting groove are secured using high-strength fasteners, preventing wobbling at the connection and eliminating the possibility of accidental loosening or jumping out under heavy loads, making it more reliable than simple pin connections.

[0012] Furthermore, a high-strength coating is applied to the surfaces of the arm and the mounting block, further securing the mounting block to the arm. This high-strength coating possesses extremely strong adhesion and excellent smoothing and filling properties; it flows and fills the connection between the mounting block and the mounting groove. After curing, the coating molecules bond tightly to the metal substrate, significantly enhancing the adhesion between the mounting block and the arm, and greatly improving the impact resistance and fatigue resistance of the connection point.

[0013] Furthermore, symmetrical connection holes are provided on the end of the arm away from the ball joint mounting base. This design conforms to the standard hole design of most vehicle square-mouth receivers on the market, requiring no special modifications and improving the product's versatility and user convenience.

[0014] In summary, this rotatable and switchable multi-ball joint trailer arm enables quick, convenient, and safe switching between different ball joints without the need for cumbersome overall disassembly. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0016] Figure 1 This is a schematic diagram of the overall assembly structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the arm body and ball head fixing seat of this utility model;

[0018] Figure 3 This is a schematic diagram of the arm body of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the ball head fixing seat of this utility model;

[0020] The components include: boom body-1, mounting groove-11, positioning hole-12, connecting hole-13, ball head fixing seat-2, connecting part-21, annular groove-211, fixing hole-212, fixing part-22, traction ball head-3, fixing block-4, locking pin-5, and trailer hook-6. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] In the description of this utility model, it should be understood that the orientation and positional relationship indicated by terms such as "up", "down", "left", "right", "front", "back", "vertical", "bottom", "inner", and "outer" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] like Figures 1 to 4 As shown, a rotatable switchable multi-ball head trailer arm includes a boom body 1 and a ball head fixing seat 2 disposed at one end of the boom body 1. A traction ball head 3 is installed on the ball head fixing seat 2. The ball head fixing seat 2 includes a connecting part 21 and a fixing part 22, which are fixedly connected. The connecting part 21 is cylindrical, and the boom body 1 has a square ring structure. The connecting part 21 is inserted into the inner ring of the boom body 1, and one end of the boom body 1 is pressed against the side of the fixing part 22. The connecting part 21 can rotate relative to the boom body 1. An annular groove 211 is provided on the connecting part 21, and an installation groove 11 is provided on the boom body 1. A fixing block 4 is provided in the installation groove 11. The bottom end of the fixing block 4 is located in the annular groove 211, and the side wall of the fixing block 4 abuts against the side wall of the annular groove 211. A locking pin 5 is provided between the connecting part 21 and the boom body 1 to lock the selected traction ball head 3 in the working position.

[0024] This solution enables rapid and convenient ball joint switching with extremely high operational efficiency. When users need to switch the towing ball joint 3, there is no need to remove the entire trailer arm from the vehicle's square receiver. Simply pull out the locking pin 5, manually rotate the ball joint fixing seat 2 to rotate the required ball joint or trailer hook 6 to the working position, and then insert the locking pin 5 to complete the switch. The entire process takes only a few seconds, saving time and effort and greatly improving the user experience, making it particularly suitable for scenarios requiring frequent changes of towing equipment. In this design, the core axial load-bearing and limiting structure is formed by the precise fit between the annular groove 211 on the connecting part 21 and the fixing block 4 in the mounting groove 11 of the arm body 1. After the bottom end of the fixing block 4 is embedded in the annular groove 211, its side wall abuts tightly against the side wall of the annular groove 211, which can effectively transmit the downward pressure generated by the towing equipment and the impact force during braking from the ball joint fixing seat 2 to the fixing block 4, and then from the fixing block 4 to the entire arm body 1. This design avoids concentrating force on the rotating shaft, and its load-bearing capacity far exceeds that of simple pin connections.

[0025] Furthermore, the arm body 1 is provided with positioning holes 12, and the connecting part 21 is provided with four fixing holes 212 evenly spaced circumferentially. The locking pin 5 is inserted into the fixing holes 212 through the positioning holes 12 to fix the arm body 1 and the connecting part 21. The four fixing holes 212 evenly spaced circumferentially correspond precisely to the positioning holes 12 on the arm body 1. When the locking pin 5 is inserted, a rigid connection is achieved between the ball head fixing seat 2 and the arm body 1. This connection method can effectively resist the huge torsional force and impact force generated during traction, and prevent the ball head fixing seat 2 from rotating or shaking slightly in any direction, ensuring the absolute stability and safety of traction operation. At the same time, the four evenly distributed fixing holes 212 indicate that the ball head fixing seat 2 can be accurately positioned to a new working position every 90° rotation. This design gives the switching operation a clear sense of gear, and the user does not need to observe visually or make repeated adjustments. He / she can quickly and accurately rotate the required ball head and lock it to the standard working position by feel, which significantly improves the convenience and efficiency of operation. Furthermore, the locking pin 5, as an independent fastener, can be further secured using cotter pins, R-clamps, or safety chains after insertion, and corresponding holes can be designed at the end of the locking pin 5. This creates a safety barrier, completely preventing the locking pin 5 from falling off due to accidental vibrations even during severe vehicle jolting, providing users with double protection and enhancing the safety factor.

[0026] Furthermore, the fixing part 22 is square, and three different sizes of towing ball joints 3 and a trailer hook 6 are installed circumferentially on the fixing part 22. By integrating three different sizes of towing ball joints 3 and a trailer hook 6 on a single trailer arm, it can be adapted to most common towing equipment on the market and can also be used for rescue and towing. Users no longer need to purchase, carry, and replace multiple independent trailer arms for different tasks, which greatly improves the equipment's versatility and convenience. At the same time, the four functional points are evenly distributed circumferentially, meaning that a function can be switched every 90° rotation. This design makes each workstation extremely clear and distinct, allowing users to easily judge whether the switch is in place by feel. Combined with the locking pin 5 mechanism, precise and reliable positioning can be achieved, effectively avoiding misoperation.

[0027] Furthermore, the fixing block 4 is square, with its top end level with the boom 1. The fixing block 4 is fastened in the mounting groove 11 and the annular groove 211. The square fixing block 4 and the opening of the annular groove 211 cooperate with each other, with multiple planes forming a large surface contact with the sidewall of the annular groove 211. When the trailer boom is subjected to enormous downward pressure or impact force generated during sudden braking, this force acts on the fixing block 4 in the form of shear force. Compared to round pins, the square cross-section has a much larger shear resistance area, which can evenly distribute the load, thus significantly improving the axial load-bearing capacity and impact resistance of the entire structure, effectively preventing the connection part 21 from detaching from the boom 1, and possessing extremely high safety and reliability. In addition, the fixing block 4 and the mounting groove 11 are installed using high-strength fasteners, which can prevent shaking at the connection point and also eliminate the possibility of accidental loosening or jumping out under heavy load conditions, making it more reliable than simply relying on pin connections.

[0028] Furthermore, the surfaces of the arm body 1 and the fixing block 4 are coated with a high-strength coating, which further secures the fixing block 4 to the arm body 1. The high-strength coating possesses extremely strong adhesion and excellent smoothing and filling properties; it flows and fills the connection between the fixing block 4 and the mounting groove 11. After curing, the coating molecules tightly bond with the metal substrate, significantly enhancing the bonding force between the fixing block 4 and the arm body 1, and greatly improving the impact resistance and fatigue resistance of the connection point.

[0029] Furthermore, symmetrical connection holes 13 are provided on the end of the arm 1 away from the ball head fixing seat 2. This design conforms to the standard hole design of most vehicle square-mouth receivers on the market, requiring no special modification and improving the product's versatility and user convenience.

[0030] In summary, this rotatable and switchable multi-ball joint trailer arm enables quick, convenient, and safe switching between different ball joints without the need for cumbersome overall disassembly.

[0031] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotatable and switchable multi-ball joint trailer boom, comprising a boom body and a ball joint mounting base disposed at one end of the boom body, wherein a traction ball joint is mounted on the ball joint mounting base, characterized in that: The ball head fixing seat includes a connecting part and a fixing part, which are fixedly connected. The connecting part is cylindrical, and the arm body is a square ring structure. The connecting part is inserted into the inner ring of the arm body, and one end of the arm body abuts against the side of the fixing part. The connecting part can rotate relative to the arm body. An annular groove is provided on the connecting part, and an installation groove is provided on the arm body. A fixing block is provided in the installation groove. The bottom end of the fixing block is located in the annular groove, and the side wall of the fixing block abuts against the side wall of the annular groove. A locking pin is provided between the connecting part and the arm body to lock the selected traction ball head in the working position.

2. The rotatable changeable multi-ball head trailer arm of claim 1, wherein: The arm body is provided with positioning holes, and the connecting part is provided with four fixing holes evenly spaced around the circumference. The locking pin is inserted into the fixing holes through the positioning holes to fix the arm body and the connecting part.

3. The rotatable changeable multi-ball head trailer arm of claim 1, wherein: The fixing part is square, and three different sizes of traction ball joints and a trailer hook are installed on the fixing part along the circumference.

4. The rotatable changeable multi-ball head trailer arm of claim 1, wherein: The fixing block is square, with its top end level with the arm body, and is fastened in the mounting groove and the annular groove.

5. The rotatable changeable multi-ball head trailer arm of claim 4, wherein: The surfaces of the arm body and the fixing block are coated with a high-strength coating, which further secures the fixing block to the arm body.

6. The rotatable changeable multi-ball head trailer arm of claim 1, wherein: The arm has symmetrical connecting holes at one end away from the ball head fixing seat.

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