Vehicle carrier with a convenient locking structure

Abstract

The present invention relates to a vehicle-mounted carrier with a convenient locking structure, including a column and a support arm. A fixed frame with an accommodation cavity is provided at the top of the column. It is characterized in that: a first positioning ring and a second positioning ring are fixed on the support arm. The first positioning ring and the second positioning ring are arranged in the accommodation cavity. The inner end of the first positioning ring is provided with first passive locking teeth, and the inner end of the second positioning ring is provided with second passive locking teeth. A locking ring that can only move left and right is constrained in the accommodation cavity. The locking ring is sleeved on the support arm, and the support arm can rotate relative to the locking ring around its own axis. A first active locking tooth is provided on one side of the locking ring, and a second active locking tooth is provided on the other side. In this vehicle-mounted carrier, the locking and unlocking operations of the support arm can be achieved only through the locking ring. Compared with the traditional locking method of pin-hole insertion and matching, there is no need for multiple operations such as pulling out, aligning, and inserting. Therefore, the operation is more convenient and fast.

Description

Technical Field

[0001] The present invention relates to a vehicle-mounted rack connected to the rear of a vehicle, which can be used to hang a bicycle or other items, and particularly relates to a vehicle-mounted rack with a convenient locking structure. Background Art

[0002] When carrying a bicycle in a traditional vehicle, people place the bicycle in the trunk of the vehicle for carrying. However, due to the relatively large volume of the bicycle, a part of the bicycle extends out of the trunk. When the road surface is bumpy, it not only causes damage to both the bicycle and the vehicle, but also poses a safety hazard during driving.

[0003] For this reason, a vehicle-mounted bicycle rack for placing a bicycle at the rear of a vehicle appears on the market. For example, the Chinese utility model patent "Vehicle-mounted Rack" with the patent number ZL202122197224.4 (publication number CN216709189U) applied by the present applicant discloses such a vehicle-mounted rack. During use, the support arm swings to the horizontal, and the second connecting wall is in the vertical position. Then, the connecting member moves rearward relative to the strip-shaped guide hole along with the support arm until the second connecting wall approaches and fits with the first connecting wall. The positioning bolt passes through the first connecting perforation and is threadedly connected to the threaded hole, so that the first connecting wall and the second connecting wall are connected. When folding, the connecting member moves forward relative to the strip-shaped guide hole along with the support arm, and the first connecting wall and the second connecting wall move away from each other to avoid interference during flipping. At this time, the support arm is swung to the vertical, the second connecting wall is in the horizontal position, and the positioning bolt passes through the second connecting perforation and is threadedly connected to the threaded hole, so as to connect the top plate and the second connecting wall and position it in the folded state.

[0004] The aforementioned patent has the advantage that the support arm is not easily shaken during use, but during the positioning process, the positioning bolt needs to be re-folded and screwed in, which is somewhat difficult to align each time. It is necessary to hold the support arm and swing it until the threaded hole is aligned with the perforation on the required wall before tightening can be achieved.

[0005] In summary, the folding and positioning structure of the existing vehicle-mounted rack still needs to be further improved. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a folding and positioning structure for a vehicle-mounted rack with a completely new structure, reasonable design, and simple and convenient operation in view of the above-mentioned current situation of the prior art.

[0007] The technical solution adopted by the present invention to solve the above technical problems is as follows: A vehicle-mounted carrier with a convenient locking structure includes a column and a support arm for carrying an object. A fixed frame is provided at the top of the column. The fixed frame has a receiving cavity. The support arm passes through the fixed frame and can rotate around its own axis. It is characterized in that: A first positioning ring and a second positioning ring are fixed on the support arm and are arranged at intervals left and right. The first positioning ring and the second positioning ring are arranged in the receiving cavity. The inner end of the first positioning ring is provided with a first passive locking tooth, and the inner end of the second positioning ring is provided with a second passive locking tooth. A locking ring that can only move left and right is constrained in the receiving cavity. The locking ring is located between the first positioning ring and the second positioning ring. The locking ring is sleeved on the support arm and the support arm can rotate around its own axis relative to the locking ring. A first active locking tooth is provided on one side of the locking ring, and a second active locking tooth is provided on the other side. When in use, the support arm swings to the horizontal direction, the locking ring moves to abut against the first positioning ring, and the first active locking tooth meshes with the first passive locking tooth, and the support arm cannot rotate relative to the fixed frame. When folding, the support arm swings to the vertical direction, the locking ring moves to abut against the second positioning ring, and the second active locking tooth meshes with the second passive locking tooth, and the support arm cannot rotate relative to the fixed frame. When unlocking, the locking ring is moved so that the first active locking tooth is disengaged from the first passive locking tooth and the second active locking tooth is disengaged from the second passive locking tooth, and the support arm can rotate relative to the fixed frame.

[0008] Further improvement, it also includes a locking bolt for locking the locking ring. When the locking ring locks the support arm in the use or folding position, tightening the locking bolt can lock the locking ring to prevent the locking ring from shifting during the vehicle's travel, resulting in unstable locking and better use safety. Using the locking bolt for locking has the advantages of simple structure and simple and convenient locking and unlocking operations.

[0009] As a preferred solution, a strip-shaped hole is opened on the side wall of the above fixed frame, and a threaded hole is opened on the locking ring. The locking bolt passes through the strip-shaped hole and is threadedly connected to the threaded hole. Tightening the locking bolt can position the locking ring in the locking position. Loosening the locking bolt, the locking bolt can move left and right with the locking ring. The strip-shaped hole and the rod portion of the locking bolt form a guide and are always threadedly connected to the threaded hole. The whole operation does not require screwing out the locking bolt, and the locking ring can be driven to move by moving the locking bolt, which is convenient for operation.

[0010] Preferably, the tooth height of the first passive latching tooth is arranged opposite to the tooth recess of the second passive latching tooth. This structure ensures that the first passive latching tooth and the second passive latching tooth are always in an offset position, ensuring that the locking ring can only be locked by moving toward one of the first and second positioning rings in the use state, and can only be locked by moving toward the other of the first and second positioning rings in the folded state. When unlocking, even if the locking ring is moved in the opposite direction to contact the other positioning ring, the active and passive latching teeth will not engage with each other, making the unlocking operation more foolproof and preventing misoperation.

[0011] As a further improvement, a spring is provided between the second positioning ring and the locking ring to keep the locking ring moving toward the first positioning ring. This structure facilitates locking the support arm in the use position (i.e., the support arm swings to the horizontal direction). When in use, it is only necessary to release the lock of the locking bolt. Under the action of the spring, the locking ring moves toward the first positioning ring until it contacts the first positioning ring (the tooth height of the locking ring contacts the wing height of the positioning ring). At this time, the support arm is lifted to the horizontal position by hand (the support arm has a certain weight, so a certain amount of force is required to lift the support arm). Under the action of the spring, the locking ring further moves toward the first positioning ring until the first active tooth engages with the first passive tooth. Then, release the hand and tighten the locking bolt again. The operation can be completed with one hand, making the adjustment of the use state more convenient. During the folding operation, you need to support the support arm with your hand, and at the same time move the locking bolt to drive the locking ring to overcome the elastic force of the spring and move outward. After the lock is released, the support arm swings to the vertical position under the action of gravity (the hand always supports the support arm to avoid it from swinging down quickly and hitting the frame). Then move the locking bolt further to drive the locking ring to overcome the elastic force of the spring and move outward until the second active tooth engages with the second passive tooth. At the same time, tighten the locking bolt to complete the locking of the folded position. Although the folding operation requires the cooperation of both hands, the operation is not difficult because the support arm tends to swing downward under its own weight.

[0012] As a further improvement, the outer end of the first positioning ring is provided with two side protrusions and first blocks spaced along the circumference. The accommodating cavity is provided with a second block extending upward. The second block is located between the two first blocks. When the first positioning ring swings horizontally with the support arm, the second block engages with one of the first blocks. When the first positioning ring swings vertically with the support arm, the second block engages with the other first block. This solution is convenient for operation. The support arm only needs to be locked in two positions. When the second block engages with one of the first blocks, the support arm is in one of the horizontal or vertical positions. These two positions can ensure that the first active tooth is aligned with the first passive tooth, or the second active tooth is aligned with the second passive tooth. The operator does not need to fold the active and passive teeth in half, achieving fool-proof operation.

[0013] For convenient assembly, as an improvement, the above-mentioned fixing bracket is formed by the butting of a base and an upper cover. The base is fixed on the column. A lower groove penetrating left and right is provided on the base, and an upper groove penetrating left and right is provided on the upper cover. The lower groove and the upper groove are butted to form a through hole, and cover plates are provided at both left and right ends of the through hole to form the accommodating cavity. The support plate, the first positioning ring, the locking ring, the second positioning ring and the two cover plates can be placed in the lower groove first, and then the upper cover is covered. Bolts can be used to fasten between the upper cover and the lower cover, and the installation is convenient and reliable.

[0014] As a further improvement, the above-mentioned lower groove is composed of a rectangular groove part and arc groove parts located on both left and right sides of the rectangular groove part. The first positioning ring and the second positioning ring are located at the positions of the arc groove parts. The locking ring is formed by the butting of an upper half locking ring and a lower half locking ring. The bottom of the lower half locking ring has a guiding part extending downward and matching the shape of the rectangular groove part, and the upper half locking ring is constrained by the upper cover. The locking ring is formed by the butting of the upper half locking ring and the lower half locking ring, which is beneficial to installing the locking ring on the support arm. Moreover, the bottom of the lower half locking ring has a guiding part extending downward and matching the shape of the rectangular groove part, which has a constraining effect on the installation of the lower half locking ring, and thus has a constraining effect on the locking ring, further ensuring that the locking ring can only move along the lower groove.

[0015] As an improvement, a positioning hole is provided on the top surface of the above-mentioned lower half locking ring, and a positioning pin inserted into the positioning hole is provided on the upper half locking ring. The positioning pin and the positioning hole are aligned and inserted, so that the upper half locking ring and the lower half locking ring are better aligned.

[0016] If the positioning ring is a complete ring, it is necessary to sleeved the positioning ring from the end of the support arm, and the assembly is inconvenient. As a further improvement, the above-mentioned first positioning ring is composed of the butting of a first upper half ring and a first lower half ring, and a first pin passes through the first upper half ring, the support arm and the first lower half ring to lock the three together; the second positioning ring is composed of the butting of a second upper half ring and a second lower half ring, and a second pin passes through the second upper half ring, the support arm and the second lower half ring to lock the three together. The positioning ring is formed by the butting of the upper half ring and the lower half ring, which is conducive to installation. Moreover, the upper half ring, the lower half ring and the support arm are locked together by the positioning pin, without welding, and the assembly is convenient.

[0017] Compared with the prior art, the advantages of the present invention are as follows: In the vehicle-mounted carrier of the present vehicle, the locking and unlocking operations of the support arm only need to directly move the locking ring. Compared with the traditional locking method of pin hole insertion and matching, there is no need for multiple operations of pulling out, aligning and inserting. Therefore, the operation is more convenient and fast; the locking of the support arm relies on the active teeth on the locking ring to engage with the passive teeth on the corresponding side of the positioning ring to achieve anti-rotation locking. The teeth mesh with each other, and the meshing surface between the teeth is larger, so the locking is more stable and not easy to shake; the entire locking structure is hidden in the accommodating cavity and is not exposed, so the overall shape of the vehicle-mounted hanger is more concise, generous and not obtrusive; when the connecting arm is used, there is only the swinging action, and the action is simple. Description of the Drawings

[0018] Figure 1 Schematic three - dimensional structure diagram (support arm in deployed state) of an embodiment of the present invention;

[0019] Figure 2 Cross - sectional view (support arm in deployed state) of an embodiment of the present invention;

[0020] Figure 3 Schematic three - dimensional structure diagram after removing the upper cover (support arm in deployed state) of an embodiment of the present invention;

[0021] Figure 4 Schematic three - dimensional structure diagram (support arm in folded state) of an embodiment of the present invention;

[0022] Figure 5 Cross - sectional view (support arm in folded state) of an embodiment of the present invention;

[0023] Figure 6 Schematic three - dimensional structure diagram after removing the upper cover (support arm in folded state) of an embodiment of the present invention;

[0024] Figure 7 Partial three - dimensional exploded view of an embodiment of the present invention. Detailed implementation manners

[0025] The present invention will be further described in detail below in conjunction with the embodiments with reference to the drawings.

[0026] As Figures 1 to 7 shown, it is a preferred embodiment of the present invention.

[0027] A vehicle - mounted carrier with a convenient locking structure includes a column 1 directly or indirectly connected to an automobile and a support arm 2 for carrying an object. The support arm 2 is a U - shaped pipe fitting. The two parallel rod parts of the support arm 2 are for placing a bicycle, and fixing clips are installed on the two parallel rod parts of the support arm 2. The above is the conventional design of an existing bicycle hanger. A fixing frame 3 is provided at the top of the column 1. The fixing frame 3 has a receiving cavity 3a. The middle cross - beam of the support arm 2 passes through the fixing frame 3 and can rotate around its own axis.

[0028] A first positioning ring 5a and a second positioning ring 5b are fixedly arranged on the support arm 2 at intervals left and right. The first positioning ring 5a and the second positioning ring 5b are arranged in the receiving cavity 3a. A first passive locking tooth 51 is provided at the inner end of the first positioning ring 5a, and a second passive locking tooth 52 is provided at the inner end of the second positioning ring 5b. The tooth height in the first passive locking tooth 51 is arranged opposite to the tooth recess in the second passive locking tooth 52.

[0029] A locking ring 6, capable of only left-right movement, is constrained within cavity 3a. It's located between first positioning ring 5a and second positioning ring 5b. Sleeved on support arm 2, the ring can rotate relative to the support arm 2 about its own axis. One side of the ring is equipped with a first active tooth 61, and the other side with a second active tooth 62. A spring 7 is located between second positioning ring 5b and the ring, ensuring the ring maintains its tendency to move toward first positioning ring 5a.

[0030] When in use, the support arm 2 swings to the horizontal direction, the locking ring 6 moves to abut against the first positioning ring 5a, the first active tooth 61 engages with the first passive tooth 51, and the support arm 2 cannot rotate relative to the fixed frame 3; when folded, the support arm 2 swings to the vertical direction, the locking ring 6 moves to abut against the second positioning ring 5b, the second active tooth 52 engages with the second passive tooth 62, and the support arm 2 cannot rotate relative to the fixed frame 3; when unlocked, the locking ring 6 is moved so that the first active tooth 61 is disengaged from the first passive tooth 51 and the second active tooth 62 is disengaged from the second passive tooth 52, and the support arm 2 can rotate relative to the fixed frame 3.

[0031] The fixing frame 3 also includes a locking bolt 4 for locking the locking ring 6. A strip-shaped hole 3b is formed in the side wall of the fixing frame 3, and a threaded hole 63 is formed in the locking ring 6. The locking bolt 4 passes through the strip-shaped hole 3b and is threadedly connected to the threaded hole 63. Tightening the locking bolt 4 locks the locking ring 6 in the locked position. Loosening the locking bolt 4 allows the locking bolt 4 to move left and right with the locking ring 6.

[0032] The outer end of the first positioning ring 5a is provided with two side protrusions and first stops 8a arranged at intervals along the circumference. The accommodating cavity 3a is provided with an upwardly extending second stop 8b, and the second stop 8b is located between the two first stops 8a. When the first positioning ring 5a swings to the horizontal direction with the support arm 2, the second stop 8b is engaged with one of the first stops 8a. When the first positioning ring 5a swings to the vertical direction with the support arm 2, the second stop 8b is engaged with the other first stop 8a.

[0033] The fixing frame 3 is formed by a base 31 and an upper cover 32. The base 31 is fixed on the column 1. The base 31 is provided with a lower groove 311 running through the left and right sides. The upper cover 32 is provided with an upper groove 321 running through the left and right sides. The lower groove 311 and the upper groove 321 are matched to form a through hole. Cover plates 33 are provided at the left and right ends of the through hole to cover and form the accommodating cavity 3a.

[0034] The lower groove 311 consists of a rectangular groove portion 31a and arc-shaped groove portions 31b located on the left and right sides of the rectangular groove portion 31a. The first positioning ring 5a and the second positioning ring 5b are located at the position of the arc-shaped groove portion 31b. The locking ring 6 is formed by the upper half locking ring 6a and the lower half locking ring 6b. The bottom of the lower half locking ring 6b has a guide portion 6b1 extending downward and having an outer shape matching the rectangular groove portion 31a. The upper half locking ring 6a is constrained by the upper cover 32.

[0035] The top surface of the lower locking ring 6b is provided with a positioning hole 6b2, and the upper locking ring 6a is provided with a positioning pin 6a1 that is inserted into the positioning hole 6b2. The first positioning ring 5a is composed of a first upper half ring 5a1 and a first lower half ring 5a2, with a first latch 9a passing through the first upper half ring 5a1, the support arm 2, and the first lower half ring 5a2 to lock the three together. The second positioning ring 5b is composed of a second upper half ring 5b1 and a second lower half ring 5b2, with a second latch 9b passing through the second upper half ring 5b1, the support arm 2, and the second lower half ring 5b2 to lock the three together.

[0036] During operation, it is only necessary to release the lock of the locking bolt 4 (loosen the locking bolt 4), and the locking ring 6 moves toward the first positioning ring 5a under the action of the spring 7 until it contacts the first positioning ring 5a (the tooth height of the first active latch tooth 61 contacts the wing height of the first passive latch tooth 51). At this time, lift the support arm 2 to the horizontal position by hand (the support arm 2 has a certain weight, and a certain force is required to lift the support arm 2). The locking ring 6 moves further toward the first positioning ring 5a under the action of the spring 7 until the first active latch tooth 61 engages with the first passive latch tooth 51. Let go and tighten the locking bolt 4 to complete the locking. The operation can be completed with one hand, and the adjustment operation of the use status is more convenient.

[0037] During the folding operation, the support arm 2 needs to be supported by the hand to release the lock of the locking bolt 4 (loosen the locking bolt 4), and at the same time, move the locking bolt 4 to drive the locking ring 6 to overcome the elastic force of the spring 7 and move outward. Under the action of external force, the locking ring 6 moves toward the second positioning ring 5b until it contacts the second positioning ring 5b (the tooth height of the second active latch tooth 62 contacts the wing height of the second passive latch tooth 52), and the support arm 2 swings to the vertical position under the action of gravity (the hand always supports the support arm 2 to avoid rapid swinging and hitting the frame), and then further move the locking bolt 4 to drive the locking ring 6 to overcome the elastic force of the spring 7 and move outward until the second active latch tooth 62 engages with the second passive latch tooth 52, and at the same time tighten the locking bolt 4 to complete the locking of the folded position. Although the folding operation requires the cooperation of both hands, the operation is not difficult because the support arm 2 has a tendency to swing downward under its own weight.

[0038] It should be noted that in the description of this embodiment, the terms "front, rear", "left, right", "up, down", etc. indicating directions or positional relationships are all based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "install", "connect", and "connected" should be understood in a broad sense. For example, they can be fixed connections, detachable connections, or integral connections; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A vehicle-mounted carrier with a convenient locking structure, comprising a column (1) and a support arm (2) for carrying an object. A fixing frame (3) is provided at the top of the column (1). The fixing frame (3) has a receiving cavity (3a). The support arm (2) is inserted through the fixing frame (3) and can rotate around its own axis. It is characterized in that: The two parallel rod portions of the support arm (2) are for placing a bicycle. A first positioning ring (5a) and a second positioning ring (5b) are fixed on the support arm (2) and are arranged at intervals left and right. The first positioning ring (5a) and the second positioning ring (5b) are arranged in the accommodating cavity (3a). The inner end of the first positioning ring (5a) is provided with a first passive engaging tooth (51), and the inner end of the second positioning ring (5b) is provided with a second passive engaging tooth (52). A locking ring (6) that can only move left and right is constrained in the accommodating cavity (3a). The locking ring (6) is located between the first positioning ring (5a) and the second positioning ring (5b). The locking ring (6) is sleeved on the support arm (2) and the support arm (2) can rotate relative to the locking ring (6) around its own axis. One side of the locking ring (6) is provided with a first active engaging tooth (61), and the other side is provided with a second active engaging tooth (62). When in use, the support arm (2) swings to the horizontal, the locking ring (6) moves to abut against the first positioning ring (5a), and the first active engaging tooth (61) meshes with the first passive engaging tooth (51), and the support arm (2) cannot rotate relative to the fixed frame (3). When folding, the support arm (2) swings to the vertical, the locking ring (6) moves to abut against the second positioning ring (5b), and the second active engaging tooth (62) meshes with the second passive engaging tooth (52), and the support arm (2) cannot rotate relative to the fixed frame (3). When unlocking, the locking ring (6) is moved to a state where the first active engaging tooth (61) is disengaged from the first passive engaging tooth (51) and the second active engaging tooth (62) is disengaged from the second passive engaging tooth (52), and the support arm (2) can rotate relative to the fixed frame (3).

2. The vehicle-mounted carrier with a convenient locking structure according to claim 1, characterized in that: It further includes a locking bolt (4) for locking the locking ring (6).

3. The vehicle-mounted carrier with a convenient locking structure according to claim 2, wherein: A strip-shaped hole (3b) is formed on the side wall of the fixed frame (3), and a threaded hole (63) is formed on the locking ring (6). The locking bolt (4) passes through the strip-shaped hole (3b) and is threadedly connected to the threaded hole (63). Tightening the locking bolt (4) can position the locking ring (6) at the locking position. Loosening the locking bolt (4), the locking bolt (4) can move left and right along with the locking ring (6).

4. The vehicle-mounted carrier with a convenient locking structure according to claim 3, characterized in that: The tooth height in the first passive engaging tooth (51) is arranged opposite to the tooth recess of the second passive engaging tooth (52).

5. The vehicle-mounted carrier with a convenient locking structure according to any one of claims 1 to 4, characterized in that: A spring (7) for keeping the locking ring (6) in a moving trend towards the first positioning ring (5a) is arranged between the second positioning ring (5b) and the locking ring (6).

6. The vehicle-mounted carrier with a convenient locking structure according to claim 1, wherein: Two side protrusions are provided at the outer end of the first positioning ring (5a) and are arranged at intervals along the circumference as first stoppers (8a). A second stopper (8b) extending upward is provided in the accommodating cavity (3a). The second stopper (8b) is located between the two first stoppers (8a). When the first positioning ring (5a) swings to the horizontal along with the support arm (2), the second stopper (8b) is engaged with one of the first stoppers (8a). When the first positioning ring (5a) swings to the vertical along with the support arm (2), the second stopper (8b) is engaged with the other first stopper (8a).

7. The vehicle-mounted carrier with a convenient locking structure according to claim 1, wherein: The fixing bracket (3) is formed by the mating of a base (31) and an upper cover (32). The base (31) is fixed on the column (1). A lower groove (311) penetrating left and right is provided on the base (31). An upper groove (321) penetrating left and right is provided on the upper cover (32). The lower groove (311) and the upper groove (321) are mated to form a perforation. Cover plates (33) are provided to cover both left and right ends of the perforation, thereby forming the accommodating cavity (3a).

8. The vehicle-mounted carrier with a convenient locking structure according to claim 7, characterized in that: The lower groove (311) is composed of a rectangular groove portion (31a) and arc groove portions (31b) located on both left and right sides of the rectangular groove portion (31a). The first positioning ring (5a) and the second positioning ring (5b) are located at the positions of the arc groove portions (31b). The locking ring (6) is formed by the mating of an upper half locking ring (6a) and a lower half locking ring (6b). A guiding portion (6b1) extending downward and having an outer shape matching that of the rectangular groove portion (31a) is provided at the bottom of the lower half locking ring (6b). The upper half locking ring (6a) is constrained by the upper cover (32).

9. The vehicle-mounted carrier with a convenient locking structure according to claim 8, characterized in that: A positioning hole (6b2) is provided on the top surface of the lower half locking ring (6b). A positioning pin (6a1) inserted into the positioning hole (6b2) is provided on the upper half locking ring (6a).

10. The vehicle-mounted carrier with a convenient locking structure according to claim 8, characterized in that: The first positioning ring (5a) is composed of the mating of a first upper half ring (5a1) and a first lower half ring (5a2). A first pin (9a) passes through the first upper half ring (5a1), the support arm (2), and the first lower half ring (5a2) to lock the three together. The second positioning ring (5b) is composed of the mating of a second upper half ring (5b1) and a second lower half ring (5b2). A second pin (9b) passes through the second upper half ring (5b1), the support arm (2), and the second lower half ring (5b2) to lock the three together.

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