Lock head convertible three ball trailer arm

Abstract

The application discloses a three-ball trailer arm with convertible lock head, which comprises a fixing cylinder, a fixing frame, side plates, a clamping plate, first and second supporting plates, a pin rod, a positioning sleeve, hanging balls and a trailer hook, the fixing frame is fixedly installed on the left side of the clamping plate, the fixing cylinder is fixedly inserted into the fixing frame, the number of the side plates is two, the two side plates are fixedly installed on the right side of the clamping plate, the number of the first supporting plates is two, the two first supporting plates are fixedly clamped into the side plates from the right side, the second supporting plate is arranged below the first supporting plate, the three-ball trailer arm with the convertible lock head can be movably penetrated through pin holes one, two and three by the pin rod, three-point fixing is realized, the stability of the hanging balls and the trailer hook during use is ensured, the height of the hanging balls and the hook on the fixing frame can be conveniently adjusted by personnel, the lock head can be multifunctionally converted to facilitate the use of the trailer under different conditions, the three hanging balls can be used for different vehicle models, and the use limitation of the trailer arm is reduced.

Description

Technical Field

[0001] This invention relates to the field of vehicle traction technology, specifically to a three-ball trailer arm with a convertible lock head. Background Technology

[0002] Currently, trailer hitches are becoming increasingly common in daily life, and their applications are becoming more widespread. For example, vehicles may need to be towed due to breakdowns during use, and vehicles such as RVs, motorcycles, and speedboats require towing during transport and movement. Therefore, to facilitate towing, a trailer hitch assembly is installed on the front of the towed vehicle, and a matching trailer arm is installed at the rear of the towing vehicle. Existing trailer arm hook assemblies generally connect to the trailer arm through only two limiting points, resulting in insufficient installation and connection strength. When towing large vehicles, the connection is prone to breakage, and the height of the trailer arm hook assembly cannot be adjusted, making it unsuitable for towing in different situations and affecting the normal operation of towing.

[0003] For example, announcement number CN220594555U discloses a three-ball head trailer arm with a rotatable hook. Through its connecting components, in conjunction with the trailer assembly, ball head assembly, and limiting components, it not only provides a buffering effect but also enhances the overall structure and the connection stability between the trailer and the trailer, thus improving safety. In use, the connecting plate and the trailer towing plate are first threaded together. Then, the crossbar, connecting box, and clip are connected and fixed using pins. The pins enhance the connection strength and stability between the connecting components and the trailer assembly. During use, the three-ball head body connects to the trailer. When the trailer moves backward with the three-ball head body, the connecting rod compresses the spring, which provides a buffering effect.

[0004] To address this, we propose a three-ball trailer arm with a convertible lock head. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a three-ball trailer arm with a convertible lock head. This solves the problem that existing trailer arm hooks, when connected to the trailer arm, generally rely on only two limiting points for connection, resulting in insufficient installation and connection strength. This makes them prone to disconnection when towing large vehicles, and the height of the trailer arm hook cannot be adjusted, failing to adapt to different towing conditions and affecting normal towing operations.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a three-ball trailer arm with a convertible lock head, comprising a fixed cylinder, a fixed frame, side plates, a clamping plate, a first support plate, a second support plate, a pin, a positioning sleeve, a hanging ball, and a trailer hook. The fixed frame is fixedly installed on the left side of the clamping plate, and the fixed cylinder is fixedly inserted into the fixed frame. There are two side plates, both fixedly installed on the right side of the clamping plate. There are two first support plates, both fixedly inserted into the side plates from the right side. The second support plate is positioned below the first support plate, and the second support plate extends from... The right side is fixedly inserted into the side plate. The top and bottom, front and back of the positioning sleeve are respectively provided with slot 2 and slot 1. The positioning sleeve is inserted into the support plate 2 and the two side plates from the right side through slot 1 and slot 2. A connecting block is fixedly installed on the inner wall of the positioning sleeve. A connecting cylinder is fixedly installed at one end of the fixed cylinder. There are three hanging balls. The bottom of each of the three hanging balls is fixedly installed with a stud. A screw hole is opened on the outer wall of the connecting cylinder. The stud is threaded to the screw hole. Pin hole 3, pin hole 1 and pin hole 2 are respectively opened on the support plate 2, the positioning sleeve and the connecting block.

[0007] The pin rod, with movable through pin holes one, two and three, is used to limit and fix the positioning sleeve on the support plate two and the side plate;

[0008] The trailer hitch is fixedly installed at the bottom of the connecting cylinder for towing vehicles.

[0009] Preferably, a ring plate is fixedly installed on the inner wall of each of the three pin holes. The ring plate is in close contact with the outer wall surface of the pin. By setting the ring plate, the pin can be squeezed in the three pin holes, which improves the stability of the pin during use. In addition, the ring plate will undergo elastic deformation during the towing process, which can also play a certain buffering role and reduce the possibility of damage to the trailer arm when subjected to instantaneous impact.

[0010] Preferably, the ring plate is arched in shape and made of elastic steel sheet. By setting the ring plate to an arched shape, the ring plate has a certain elastic deformation, ensuring the normal use effect of the ring plate. Furthermore, by using elastic steel sheet for the ring plate, the strength of the ring plate can be improved.

[0011] Preferably, a limiting mechanism is provided between each of the three hanging balls and the connecting cylinder. The limiting mechanism includes a fixed frame and a pin block. The fixed frame is fixedly installed on the inner wall of the connecting cylinder. A block hole is opened at the bottom end of the fixed frame. The pin block movably passes through the block hole. A pin groove is opened at the bottom end of the stud. The pin block is inserted into the pin groove. A baffle is fixedly sleeved on the outer wall of the pin block. A spring surrounds the outer wall of the pin block. One end of the spring is fixedly installed on the bottom end of the baffle, and the other end of the spring is fixedly installed on the inner wall of the fixed frame. A pull block is fixedly installed at the bottom end of the pin block. By setting the pull block, it is convenient for personnel to pull the pin block, thereby facilitating personnel operation. By setting the baffle, when the pin block moves downward, it can drive the baffle to compress the spring, ensuring that the pin block can automatically reset later.

[0012] Preferably, the pin block, pin groove, and pin hole are all rectangular in shape, and the pin block is adapted to the pin groove and pin hole. By setting the pin block and pin groove to be rectangular, the pin block can be inserted into the pin groove, thereby limiting the stud and preventing the stud from rotating and detaching from the screw hole, thus improving the stability of the hanging ball during use.

[0013] Preferably, there are several support plates, and the second and first slots are adapted to the side plate and the second support plate, respectively. By setting the first and second slots, the positioning sleeve can be inserted into the second support plate and the side plate through the first and second slots, which further improves the stability of the positioning sleeve during installation.

[0014] Preferably, the top of the pin is hinged with a handle, which makes it easier for personnel to pull the pin and thus facilitates operation.

[0015] Preferably, one end of the connecting cylinder is fitted with a cylinder cover, and the fixed cylinder has two positioning holes. By providing the cylinder cover, the internal structure of the connecting cylinder can be protected. By providing the positioning holes, the fixed cylinder can be connected and fixed to the vehicle by bolts.

[0016] This invention provides a three-ball trailer boom with a convertible lock head. Compared with the prior art, it has the following advantages:

[0017] Beneficial effects:

[0018] (1) The three-ball trailer arm with convertible lock head can be fixed at three points by passing through pin hole one, pin hole two and pin hole three through the pin rod, which ensures the stability of the hanging ball and trailer hook during use, and makes it easy for personnel to adjust the height of the hanging ball and hook on the fixed frame. The lock head can be multifunctional to adapt to different trailer use situations. By setting three hanging balls, it can be used for different vehicle models, reducing the limitations of trailer arm use.

[0019] (2) The convertible three-ball trailer arm of the lock head, through the joint cooperation of the fixed frame, pin block, block hole, pull block, spring and pin groove, can make the pin block insert into the pin groove opened at the bottom of the stud, thereby limiting the stud, ensuring the stability of the hanging ball during use, and preventing the hanging ball from rotating due to friction during the trailer, causing the stud to disengage from the screw hole, the hanging ball to fall off the connecting cylinder, and affecting the normal operation of the trailer.

[0020] (3) The convertible three-ball trailer arm of the lock head can squeeze the pin in pin hole one, pin hole two and pin hole three by setting the ring plate, which improves the stability of the pin during use. In addition, the ring plate will produce elastic deformation during the trailer to play a certain buffering role, reducing the possibility of damage to the trailer arm when subjected to instantaneous impact. The structure is simple and practical. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a front cross-sectional view of the present invention;

[0023] Figure 3 This is a side sectional view of the hanging ball structure of the present invention;

[0024] Figure 4 For the present invention Figure 1 Enlarged structural diagram of section A in the middle;

[0025] Figure 5 For the present invention Figure 2 Enlarged structural diagram of section B in the middle;

[0026] Figure 6 For the present invention Figure 3 Enlarged structural diagram of section C.

[0027] In the diagram: 1. Fixed cylinder; 2. Fixed frame; 3. Side plate; 4. Clamping plate; 5. Support plate one; 6. Support plate two; 7. Positioning sleeve; 8. Connecting cylinder; 9. Handle; 10. Slot one; 11. Slot two; 12. Pin hole one; 13. Pin hole two; 14. Ring plate; 15. Pin hole three; 16. Hanging ball; 17. Stud; 18. Screw hole; 19. Fixed frame; 20. Pin block; 21. Block hole; 22. Pull block; 23. Spring; 24. Pin groove; 25. Positioning hole; 26. Cylinder cover; 27. Trailer hook; 28. Pin rod; 29. ​​Connecting block; 30. Baffle. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-6 This invention provides two technical solutions: a three-ball trailer arm with a convertible lock head, comprising a fixed cylinder 1, a fixed frame 2, side plates 3, a clamping plate 4, a first support plate 5, a second support plate 6, a pin 28, a positioning sleeve 7, a hanging ball 16, and a trailer hook 27. The fixed frame 2 is fixedly installed on the left side of the clamping plate 4, and the fixed cylinder 1 is fixedly inserted into the fixed frame 2. There are two side plates 3, which are fixedly installed on the right side of the clamping plate 4. There are two first support plates 5, which are fixedly inserted into the side plates 3 from the right side. The second support plate 6 is located below the first support plate 5 and is fixedly inserted into the side plates 3 from the right side. The positioning sleeve 7 has a second slot 11 and a first slot 10 at its top and bottom, and on its front and back sides, respectively. The positioning sleeve 7 is inserted into the second support plate 6 and the two side plates 3 from the right side through the first slot 10 and the second slot 11. There are several second support plates 6, and the second slot 11 and the first slot 10 are respectively adapted to the side plates 3 and the second support plate 6. By setting slot 10 and slot 21, the positioning sleeve 7 can be inserted into the support plate 26 and the side plate 3 through slot 10 and slot 21, which further improves the stability of the positioning sleeve 7 during installation. The inner wall of the positioning sleeve 7 is fixedly installed with a connecting block 29. One end of the fixing cylinder 1 is fixedly installed with a connecting cylinder 8. One end of the connecting cylinder 8 is fitted with a cylinder cover 26. The fixing cylinder 1 has two positioning holes 25. By setting the cylinder cover 26, the internal structure of the connecting cylinder 8 can be protected. By setting the positioning holes 25, the fixing cylinder 1 can be connected and fixed on the vehicle with bolts. There are three hanging balls 16. The bottom of each of the three hanging balls 16 is fixedly installed with a stud 17. The outer wall of the connecting cylinder 8 has a screw hole 18. The stud 17 is threadedly connected to the screw hole 18. The support plate 26, the positioning sleeve 7 and the connecting block 29 are respectively provided with pin hole 3 15, pin hole 12 and pin hole 2 13.

[0030] The pin 28, with movable through pin holes 12, 13, and 15, is used to limit and fix the positioning sleeve 7 on the support plate 2 6 and the side plate 3. A ring plate 14 is fixedly installed on the inner wall of each of the pin holes 12, 13, and 15. The ring plate 14 is in close contact with the outer surface of the pin 28. By setting the ring plate 14, the pin 28 can be compressed within the pin holes 12, 13, and 15, improving the stability of the pin 28 during use. Furthermore, the ring plate 14 will undergo elastic deformation during trailer operation. It plays a certain role in buffering and reducing the possibility of damage to the trailer arm when subjected to instantaneous impact. The ring plate 14 is arched and made of elastic steel sheet. By setting the ring plate 14 to an arch shape, the ring plate 14 has a certain elastic deformation, ensuring the normal use effect of the ring plate 14. Furthermore, by using elastic steel sheet, the strength of the ring plate 14 can be improved. The top of the pin 28 is hinged with a handle 9. By setting the handle 9, it is easy for personnel to pull the pin 28, thus facilitating operation.

[0031] The trailer hook 27 is fixedly installed at the bottom of the connecting cylinder 8 for towing vehicles.

[0032] Example 1

[0033] In use, pull handle 9 upwards. Handle 9 moves pin 28 upwards, causing pin 28 to disengage from support plate 1 5, support plate 2 6, and positioning sleeve 7. This removes pin 28 from limiting positioning sleeve 7 and connecting block 29. Then, pull positioning sleeve 7 outwards to disengage positioning sleeve 7 and connecting block 29 from support plate 2 6 and side plate 3. Next, insert positioning sleeve 7 and connecting block 29 into support plate 2 6 and side plate 3 at the required height through slots 1 10 and 11. Then, insert pin 28 from above, moving through pin holes 1 12, 13, and 15 to fix positioning sleeve 7 again, ensuring the stability of hanging ball 16 and trailer hook 27 during use. The above structure allows adjustment of the height of hanging ball 16 and hook on the fixing frame 2, and the lock can be multifunctionally converted to adapt to different trailer use situations. By setting three hanging balls 16, it can be used with different vehicle models, reducing the limitations of trailer arm use.

[0034] Example 2

[0035] The technical solution of this embodiment, which differs from that of Embodiment 1, includes: a limiting mechanism is provided between each of the three hanging balls 16 and the connecting cylinder 8. The limiting mechanism includes a fixed frame 19 and a pin block 20. The fixed frame 19 is fixedly installed on the inner wall of the connecting cylinder 8. A block hole 21 is opened at the bottom end of the fixed frame 19, and the pin block 20 movably passes through the block hole 21. A pin groove 24 is opened at the bottom end of the stud 17, and the pin block 20 is inserted into the pin groove 24. The shapes of the pin block 20, the pin groove 24, and the block hole 21 are all rectangular, and the pin block 20 is adapted to the pin groove 24 and the block hole 21. By setting the pin block 20 and the pin groove 24 to be rectangular, the pin block 20 can be inserted into the pin groove 24, thereby limiting the stud 17. 7. Limiting the movement of the stud 17 to prevent it from rotating and disengaging from the screw hole 18, thus improving the stability of the hanging ball 16 during use. A baffle 30 is fixedly sleeved on the outer wall of the pin 20, and a spring 23 surrounds the outer wall of the pin 20. One end of the spring 23 is fixedly installed at the bottom of the baffle 30, and the other end is fixedly installed on the inner wall of the fixed frame 19. A pull block 22 is fixedly installed at the bottom of the pin 20. By setting the pull block 22, it is easy for personnel to pull the pin 20, thus facilitating operation. By setting the baffle 30, when the pin 20 moves downward, it can drive the baffle 30 to compress the spring 23, ensuring that the pin 20 can automatically reset later.

[0036] Before installing the ball 16, open the cylinder cover 26 and pull down the pull block 22. The pull block 22 moves the pin block 20 downward, and the pin block 20 moves the baffle 30 downward to compress the spring 23, so that the pin block 20 is no longer in the screw hole 18. Then the ball 16 can be rotated to turn the stud 17 into the screw hole 18. When the stud 17 is fully turned into the screw hole 18, the pull block 22 can be released. At this time, the baffle 30 will drive the pin block 20 to insert into the pin groove 24 opened at the bottom of the stud 17 under the restoring force of the spring 23, thereby limiting the stud 17 and ensuring the stability of the ball 16 during use. This prevents the ball 16 from rotating due to friction during trailer towing, which could cause the stud 17 to disengage from the screw hole 18 and the ball 16 to fall off the connecting cylinder 8, affecting the normal operation of the trailer.

[0037] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-ball trailer arm with convertible lock head, comprising a fixed cylinder (1), a fixed frame (2), a side plate (3), a clamping plate (4), a first support plate (5), a second support plate (6), a pin (28), a positioning sleeve (7), a hanging ball (16), and a trailer hook (27), characterized in that: The fixing frame (2) is fixedly installed on the left side of the card plate (4), and the fixing cylinder (1) is fixedly inserted into the fixing frame (2). There are two side plates (3), and the two side plates (3) are fixedly installed on the right side of the card plate (4). There are two support plates (5), and the two support plates (5) are fixedly inserted into the side plates (3) from the right side. The support plate (6) is set below the support plate (5), and the support plate (6) is fixedly inserted into the side plates (3) from the right side. The positioning sleeve (7) has a slot (11) at the top and bottom, and a slot (10) at the front and back, respectively. The positioning sleeve (7) passes through the slot (11). (10) and the slot two (11) are inserted into the support plate two (6) and the two side plates (3) from the right side. The inner wall of the positioning sleeve (7) is fixedly installed with a connecting block (29). One end of the fixing cylinder (1) is fixedly installed with a connecting cylinder (8). There are three hanging balls (16). The bottom ends of the three hanging balls (16) are fixedly installed with studs (17). The outer wall of the connecting cylinder (8) is provided with a screw hole (18). The stud (17) is threadedly connected to the screw hole (18). The support plate two (6), the positioning sleeve (7) and the connecting block (29) are respectively provided with a pin hole three (15), a pin hole one (12) and a pin hole two (13). The pin (28), through pin hole one (12), pin hole two (13) and pin hole three (15) are used to limit and fix the positioning sleeve (7) on the support plate two (6) and the side plate (3); The trailer hook (27) is fixedly installed at the bottom of the connecting cylinder (8) for towing vehicles.

2. A three-ball trailer boom with a convertible lock head according to claim 1, characterized in that: The inner walls of the first pin hole (12), the second pin hole (13) and the third pin hole (15) are all fixedly installed with ring plates (14), and the ring plates (14) are in close contact with the outer wall surface of the pin rod (28).

3. A three-ball trailer boom with a convertible lock head according to claim 2, characterized in that: The ring plate (14) is arched in shape and is made of elastic steel sheet.

4. A three-ball trailer boom with a convertible lock head according to claim 1, characterized in that: A limiting mechanism is provided between each of the three hanging balls (16) and the connecting cylinder (8). The limiting mechanism includes a fixed frame (19) and a pin block (20). The fixed frame (19) is fixedly installed on the inner wall of the connecting cylinder (8). A block hole (21) is opened at the bottom end of the fixed frame (19). The pin block (20) is movably inserted through the block hole (21). A pin groove (24) is opened at the bottom end of the stud (17). The pin block (20) is inserted into the pin groove (24). A baffle (30) is fixedly sleeved on the outer wall of the pin block (20). A spring (23) surrounds the outer wall of the pin block (20). One end of the spring (23) is fixedly installed at the bottom end of the baffle (30). The other end of the spring (23) is fixedly installed on the inner wall of the fixed frame (19). A pull block (22) is fixedly installed at the bottom end of the pin block (20).

5. A three-ball trailer boom with a convertible lock head according to claim 4, characterized in that: The pin block (20), pin groove (24), and block hole (21) are all rectangular in shape, and the pin block (20) is adapted to the pin groove (24) and block hole (21).

6. A three-ball trailer boom with a convertible lock head according to claim 1, characterized in that: The number of the second support plate (6) is several, and the second slot (11) and the first slot (10) are respectively adapted to the side plate (3) and the second support plate (6).

7. A three-ball trailer boom with a convertible lock head according to claim 1, characterized in that: The top of the pin (28) is hinged to a handle (9).

8. A three-ball trailer boom with a convertible lock head according to claim 1, characterized in that: One end of the connecting cylinder (8) is fitted with a cylinder cover (26), and the fixing cylinder (1) has a through-hole (25), the number of which is two.

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