Stepless unlocking fixture

Abstract

This invention provides a stepless unlocking fixing device, comprising: a base, including a bottom plate and two side plates forming a receiving cavity, a through hole in the middle of the bottom plate and a buckle on one side; a handle, including a cam portion pivotally connected between the two side plates of the base and housed in the receiving cavity, the cam portion extending toward the buckle direction to have an operating portion, and the cam portion having a protruding contact portion and an arc surface on the other side opposite to the operating portion, the arc surface having a first abutting portion near the contact portion and a second abutting portion away from the contact portion; and a top holding base, including a positioning plate with a through hole extending into the base and a top rod entering the receiving cavity protruding upward from the positioning plate, the top side of the top rod having a contact surface, and a wider interference portion above the side and a narrower locking portion below.

Description

Technical Field

[0001] This invention relates to a stepless unlocking fixing device, and more particularly to a fixing device in which the contact portion of the handle of the fixing device forms a fully unlocked state with the top rod of the top support not in contact with the arc surface; the contact portion of the handle forms contact with the contact surface and the first abutment portion forms contact with the interference portion of the top support to form a buffered unlocking state; the contact portion of the handle forms contact with the contact surface and the second abutment portion forms contact with the locking portion of the top support; and the operating portion of the handle is engaged with the buckle of the base to form a fully locked state. By means of the above, the fixing device can be locked at one time and unlocked steplessly to avoid damage to the fixing device caused by instantaneous rotational abutment stress. Background Technology

[0002] With the rapid development of industrial technology, various industrial products such as computers, televisions, telephones, refrigerators, washing machines, wardrobes, drawers, and desks have long become indispensable items in people's lives. These industrial products are mostly assembled from multiple components, such as the casing of a computer host, the circuit board and heat sink inside a television casing, and the desktop and supporting side panels of a desk. These components are mostly assembled by screws. This allows the industrial product to be disassembled into multiple components for easy transportation, and subsequently, parts of the assembled product can be disassembled for repair or replacement.

[0003] Furthermore, since the components of the aforementioned industrial products are assembled together using screws, the surfaces of these components, which are pressed against by the screw heads during assembly, often suffer damage such as dents and cracks due to excessive tightening of the screws. To address the issue of component damage caused by screw connections, some manufacturers use welding to assemble the components. However, this design makes it difficult to disassemble some components after assembly, leading to difficulties in repairing or replacing them.

[0004] Therefore, how to solve the various problems caused by the assembly method of the aforementioned industrial product components is the direction that relevant manufacturers in this industry urgently want to study and improve. Summary of the Invention

[0005] Therefore, in view of the above-mentioned problems and deficiencies, the main objective of the present invention is to provide a stepless unlocking fixing device.

[0006] This invention provides a stepless unlocking fixing device, comprising: a base, including a bottom plate and two side plates forming a receiving cavity, a through hole in the middle of the bottom plate and a buckle on one side; a handle, including a cam portion pivotally connected between the two side plates of the base and housed in the receiving cavity, the cam portion extending toward the buckle direction to have an operating portion, and the cam portion having a protruding contact portion and an arc surface on the other side opposite to the operating portion, the arc surface having a first abutting portion near the contact portion and a second abutting portion away from the contact portion; and a top holding base, including a positioning plate with a through hole extending into the base and a top rod entering the receiving cavity protruding upward from the positioning plate, the top side of the top rod having a contact surface, and a wider interference portion above the side and a narrower locking portion below.

[0007] As described above, the contact part of the lever and the top rod of the top support seat that do not contact the arc surface form a fully unlocked state; the contact part of the lever and the contact surface form a contact, and the first abutment part and the interference part of the top support seat form a buffered unlocked state; the contact part of the lever and the contact surface form a contact, and the second abutment part and the locking part of the top support seat form a contact, and the operating part of the lever and the buckle of the base are engaged and positioned to form a fully locked state. Through the above, the purpose of one-time locking and stepless buffered unlocking of the fixing device is achieved to avoid damage to the fixing device caused by instantaneous rotational abutment stress is avoided.

[0008] The base has a first positioning groove on each side relative to the first side of the push rod. The cam portion of the lever has a shaft hole corresponding to the first positioning groove. The two first positioning grooves and the shaft hole are positioned by a pivot, forming a pivotal connection between the base and the lever. An elastic member is sleeved on the outside of the pivot. The two annular portions of the elastic member are located between the side plate of the base and the cam portion of the lever. A fixed section extends from the two annular portions toward the operating part of the lever and abuts against the bottom positioning surface of the operating part and is connected. Two abutting sections extend from the other side of the annular portions relative to the fixed section and contact the bottom plate of the base. The elastic member is a torsion spring.

[0009] The base has a second positioning groove on each side relative to the second side of the top rod. The two second positioning grooves are for the stop rod that the top rod supports laterally to be positioned through. The bottom surface of the base plate has at least one engaging body protruding downward for being fixed in the first fixing groove of the preset first plate.

[0010] The lever has an arc-shaped top surface on the top side of the cam portion that can avoid the stop bar, and a protruding contact portion extending forward from the top surface; and a slot is provided in the operating portion of the lever, and the slot is for the hook-shaped buckle at the end to extend into and be positioned.

[0011] The positioning plate of the top support has an anti-rotation directional cutting edge cut on one side, and the positioning plate with the anti-rotation directional cutting edge is fixed in the second fixing groove of the preset second plate; the top rod of the top support has an inwardly tapered surface between the interference part and the locking part, and the locking part has an outwardly tapered slope that allows the arc surface of the cam part to avoid it.

[0012] This invention provides a stepless unlocking fixing device, comprising: a base including a bottom plate and two side plates forming a receiving cavity; buckles on both sides of the bottom plate and a through hole in the middle; two levers having the same structure and symmetrically pivotally connected between the two side plates of the base; rotating the two levers toward the center unlocks the device and rotating them toward the sides locks the device; each lever includes a cam portion housed in the receiving cavity; the cam portion extends toward the buckles to form an operating portion; and the cam portion has a protruding contact portion and an arc surface on the other side of the operating portion; the arc surface has a first abutting portion near the contact portion and a portion away from the contact portion. The base has a second abutment portion; and a top support, which includes a positioning plate and the positioning plate has an upwardly protruding through hole that can be inserted into the base and a top rod that can enter the receiving cavity. The top side of the top rod has a contact surface and two sides have an interference portion with a larger upper width and a locking portion with a smaller lower width. The top rod is in a fully unlocked state when the contact portion does not contact the arc surface; a buffered unlocked state is formed when the contact portion contacts the contact surface and the first abutment portion contacts the interference portion; and a fully locked state is formed when the contact portion contacts the contact surface and the second abutment portion contacts the locking portion, and the operating part is engaged and fixed with the buckle. Attached Figure Description

[0013] Figure 1 This is a perspective view of the fixing device of the present invention.

[0014] Figure 2 This is an exploded perspective view of the fixing device of the present invention.

[0015] Figure 3 This is an exploded perspective view of the fixing device of the present invention.

[0016] Figure 4 This is a side cross-sectional view of the fixing device of the present invention in the fully unlocked state.

[0017] Figure 5 This is a side cross-sectional view of the fixing device of the present invention in the buffer unlocked state.

[0018] Figure 6 This is a side cross-sectional view of the fixing device of the present invention in the fully locked state.

[0019] Figure 7This is a perspective view of another embodiment of the fixing device of the present invention.

[0020] Figure 8 This is an exploded perspective view of another embodiment of the fixing device of the present invention.

[0021] Figure 9 This is an exploded perspective view of another embodiment of the fixing device of the present invention.

[0022] Figure 10 This is a side cross-sectional view of another embodiment of the fixing device of the present invention in the buffer unlocked state.

[0023] Figure 11 This is a perspective view of the fixing device embodiment of the present invention in the fully unlocked state.

[0024] Figure 12 This is a perspective view of the fixing device embodiment of the present invention in the fully locked state.

[0025] Explanation of reference numerals in the attached drawings: 1-Base; 10-Accommodating cavity; 11-Bottom plate; 110-Through hole; 12-Side plate; 13-Snap fastener; 14-First positioning groove; 15-Second positioning groove; 16-Stop rod; 17-Clamping body; 2-Handle; 21-Cam part; 210-Shaft hole; 211-Top surface; 22-Operating part; 221-Positioning surface; 222-Slot; 23-Contact part; 24-Arc surface; 241-First abutment part; 242-Second abutment part 25-Holding part; 26-Pivot; 26-Elastic element; 261-Annular part; 262-Fixing section; 263-Abutting section; 27-Connecting rod; 3-Top holding seat; 31-Positioning plate; 311-Anti-rotation directional cutting edge; 32-Top rod; 321-Contact surface; 322-Interference part; 323-Locking part; 324-Gradual contraction surface; 325-Sloping surface; 4-First plate; 41-First fixing groove; 42-Heat dissipation fin; 5-Second plate; 51-Second fixing groove. Detailed Implementation

[0026] To achieve the above objectives and effects, the technical means and structure adopted by the present invention are described in detail below with reference to the accompanying drawings, so as to facilitate a complete understanding.

[0027] Please see Figures 1-6 The figures shown are a perspective view, an exploded perspective view, an exploded perspective view from another angle, a side sectional view in the fully unlocked state, a side sectional view in the buffered unlocked state, and a side sectional view in the fully locked state of the fixing device of the present invention. As can be clearly seen from the figures, the present invention provides a stepless unlocking fixing device, mainly comprising a base 1, a handle 2, and a top support 3. Its main components and features are detailed below:

[0028] The base 1 includes a base plate 11 and two side plates 12, which together form an accommodating cavity 10. A through hole 110 is provided in the middle of the base plate 11 and a buckle 13 is provided on one side.

[0029] The lever 2 includes a cam portion 21 pivotally connected between the two side plates 12 of the base 1 and housed in the receiving cavity 10. The cam portion 21 extends toward the latch 13 and has an operating portion 22. On the other side of the cam portion 21 opposite to the operating portion 22, a protruding contact portion 23 and an arc surface 24 are formed. The arc surface 24 has a first abutting portion 241 near the contact portion 23 and a second abutting portion 242 away from the contact portion 23.

[0030] The top support 3 includes a positioning plate 31, which has an upwardly protruding through hole 110 that can extend into the base 1 and a top rod 32 that enters the receiving cavity 10. The top side of the top rod 32 has a contact surface 321, and an interference portion 322 with a larger width and a locking portion 323 with a smaller width are formed on the upper side. The top rod 32 is fully unlocked when the contact portion 23 does not contact the arc surface 24. The top rod 32 is in a buffered unlocked state when the contact portion 23 contacts the contact surface 321 and the first abutment portion 241 contacts the interference portion 322. The top rod 32 is in a fully locked state when the contact portion 23 contacts the contact surface 321, the second abutment portion 242 contacts the locking portion 323, and the operating portion 22 is engaged with the buckle 13.

[0031] The base 1 is provided with first positioning grooves 14 on both sides relative to the first side of the top rod 32. The cam portion 21 of the lever 2 is provided with a shaft hole 210 corresponding to the first positioning groove 14. The two first positioning grooves 14 and the shaft hole 210 are positioned by a pivot 25 to form a pivotal connection structure between the base 1 and the lever 2. An elastic member 26 is sleeved on the outside of the pivot 25. The two annular portions 261 of the elastic member 26 are located between the side plate 12 of the base 1 and the cam portion 21 of the lever 2. A fixed section 262 extends from the two annular portions 261 toward the operating portion 22 of the lever 2, abutting against the bottom positioning surface 221 of the operating portion 22 and in a connected manner. The two abutting sections 263 extend from the other side of the annular portions 261 relative to the fixed section 262 and contact the bottom plate 11 of the base 1. The elastic member 26 is a torsion spring.

[0032] The base 1 is provided with a second positioning groove 15 on both sides relative to the second side of the top rod 32. The two second positioning grooves 15 are for the stop rod 16 that the top rod 32 supports laterally to be positioned through. The bottom surface of the base plate 11 of the base 1 is provided with at least one engaging body 17 for being fixed in the first fixing groove 41 of the preset first plate 4.

[0033] The cam portion 21 of the aforementioned lever 2 has an arc-shaped top surface 211 that can avoid the stop bar, and the top surface 211 extends forward to form a protruding contact portion 23; and the operating portion 22 of the lever 2 has a slot 222 through it, and the slot 222 is for the hook-shaped buckle 13 at the end to extend into and be positioned.

[0034] The positioning plate 31 of the aforementioned top support 3 has an anti-rotation directional cutting edge 311 cut on one side, and the positioning plate 31 with the anti-rotation directional cutting edge 311 is fixed in the second fixing groove 51 of the preset second plate 5; the top rod 32 of the top support 3 has an inwardly tapered surface 324 formed between the interference part 322 and the locking part 323, and the locking part 323 has an outwardly tapered inclined surface 325 formed downward for the arc surface 24 of the cam part 21 to avoid.

[0035] To assemble the fixing device of the present invention, firstly, the two annular portions 261 of the elastic member 26 are aligned with the two sides of the shaft hole 210 of the handle 2, and the fixing section 262 is held against the bottom positioning surface 221 of the operating part 22. Then, the handle 2 is placed into the base 1, and the shaft hole 210 is aligned with the two first positioning grooves 14. The pivot 25 is then inserted and positioned, and the two abutting sections 263 of the elastic member 26 are in inclined contact with the bottom plate 11 of the base 1. Finally, the stop rod 16 is inserted into the two second positioning grooves 15 of the base 1 to form a positioning, thereby completing the assembly of the base 1 and the handle 2. The assembled structure of the base 1 and the handle 2 is then fixed in the first fixing groove 41 of the first plate 4 by the two snap-fit ​​parts on the bottom side of the base 1, thus completing the assembly structure of the base 1, the handle 2, and the first plate 4. The positioning plate 31 of the top support 3 is then fixed in the second fixing groove 51 of the second plate 5, thus completing the assembly structure of the top support 3 and the second plate 5.

[0036] Please see Figure 4 As shown, the first plate 4 is fixed with a base 1 and a handle 2, and the second plate 5 is fixed with a top support 3. This is the fully unlocked state of the fixing device. Please refer to [link / reference]. Figure 5 As shown, when force is applied to move the first plate 4 downwards towards the second plate 5, the push rod 32 of the top support 3 extends into the through hole 110 of the base 1 and enters the receiving cavity 10. The contact surface 321 of the push rod 32 and the contact portion 23 of the handle 2 first form contact and abut against each other. Pushing the handle 2 generates clockwise rotation. Then, the interference portion 322 of the top support 3 and the first abutting portion 241 of the handle 2 also form contact and abut against each other, generating a small interference resistance (because the first abutting portion 241 is closer to the shaft hole 210). This is the buffer unlocking state of the fixing device, which can buffer the rotational abutting stress generated by the handle 2 during the locking process and effectively avoid overall damage to the fixing device. Please refer to Figure 6As shown, when the surface of the positioning plate 31 of the top support 3 abuts against the bottom plate 11 of the base 1 and forms a stop positioning, at the same time, the push rod 32 also pushes the handle 2 to rotate, and the contact part 23 of the handle 2 and the contact surface 321 of the push rod 32 maintain contact and abutment; the second abutment part 242 contacts and abuts against the locking part 323 of the top support 3 and generates a large interference resistance (because the second abutment part 242 is far from the shaft hole 210); then force is applied to the operating part 22 of the handle 2 so that the slot 222 and the buckle 13 of the base 1 are engaged and positioned and the elastic member 26 is in a compressed state. This is the fully locked state of the fixing device, which can make the first plate 4 and the second plate 5 form a combined fixing structure.

[0037] To separate and disassemble the first plate 4 and the second plate 5, first apply force to pull the hook-shaped buckle 13 in the slot 222 of the handle 2 outward to form a non-interference state. Under the restoring extension force of the elastic member 26, the handle 2 rotates counterclockwise and disengages from the buckle 13. Then, apply force to the operating part 22 of the handle 2 and pull it up, so that the contact part 23 of the handle 2 continuously presses on the contact surface 321 of the top support 3, causing the first plate 4 to move upward and away from the second plate 5, and causing the top rod 32 of the top support 3 to disengage from the through hole 110 of the base 1. The separation and disassembly of the first plate 4 and the second plate 5 are completed by the aforementioned operation.

[0038] Please see Figures 7-10 The figures shown are a perspective view, an exploded perspective view, an exploded perspective view from another angle, and a side sectional view in the buffer unlocked state, respectively, of another embodiment of the fixing device of the present invention. The disclosed embodiment is similar to... Figures 1-6 The only difference disclosed is that this embodiment uses two identical levers 2 symmetrically pivotally connected between the two side plates 12 of the base 1; both levers 2 are unlocked by rotating towards the center and locked by rotating towards the sides; the top rod 32 of the top support 3 has an upper interference portion 322 and a lower locking portion 323 on both sides. The advantage of this embodiment is that it achieves better locking effect by generating a larger locking force through the two levers 2. Its main components and features are detailed below:

[0039] The present invention provides a stepless unlocking fixing device, comprising: a base 1, which includes a bottom plate 11 and two side plates 12 and forms a receiving cavity 10, wherein buckles 13 are provided on both sides of the bottom plate 11 and a through hole 110 is provided in the middle.

[0040] Two levers 2, both having the same structure and symmetrically pivotally connected between the two side plates 12 of the base 1, can be rotated towards the center to unlock and rotated to the sides to lock. Each lever 2 includes a cam portion 21 housed in the receiving cavity 10. The cam portion 21 extends towards the buckle 13 and has an operating portion 22. On the other side of the cam portion 21 opposite to the operating portion 22, a protruding contact portion 23 and an arc surface 24 are formed. The arc surface 24 has a first abutting portion 241 near the contact portion 23 and a second abutting portion 242 away from the contact portion 23.

[0041] A top support 3 includes a positioning plate 31 with an upwardly protruding through-hole 110 that can extend into the base 1 and a top rod 32 that enters the receiving cavity 10. The top side of the top rod 32 has a contact surface 321 and two sides have an interference portion 322 with a larger upper width and a locking portion 323 with a smaller lower width. The top rod 32 is fully unlocked when the contact portion 23 does not contact the arc surface 24. The top rod 32 is in a buffered unlocked state when the contact portion 23 contacts the contact surface 321 and the first abutment portion 241 contacts the interference portion 322. The top rod 32 is in a fully locked state when the contact portion 23 contacts the contact surface 321, the second abutment portion 242 contacts the locking portion 323, and the operating portion 22 engages with the buckle 13.

[0042] Please see Figure 11 , Figure 12 The figures shown are perspective views of the fixing device embodiment of the present invention in a fully unlocked state and a fully locked state, respectively. The first plate 4 assembled on the bottom side of the base 1 and the handle 2 of the fixing device refers to the metal plate mounted on the edge of the heat sink fin 42 on the surface of electronic components that are prone to generating high temperatures (such as: central processing unit (CPU), graphics processing unit (GPU), microcontroller unit (MCU) or power supply component); while the second plate 5 assembled on the bottom side of the top support 3 refers to the metal plate on the edge of the socket (not shown) of the high-temperature electronic component fixed on the circuit board (PCB). The heat sink fins 42 have a first plate 4 with four sets of bases 1 and levers 2, and the socket has a second plate 5 with four top supports 3. The four levers 2 are arranged in pairs and each has a connecting rod 27 that links them. When the four levers 2 connected by the two connecting rods 27 are at approximately a perpendicular angle to the base 1, they are in a fully unlocked state. When the two connecting rods 27 are rotated outwards and the four levers 2 are at approximately a horizontal angle and locked at the latch 13, they are in a fully locked state. When the two connecting rods 27 are rotated outwards and the four levers 2 are at an angle between 1 and 89 degrees, they are in a buffered unlocked state. Through the above embodiment, the heat sink fins 42 and the socket on the circuit board can be quickly installed and removed, and the operation of stepless buffered unlocking can be realized.

[0043] The main feature of this invention is that the contact portion 23 of the handle 2 of the fixing device and the arc surface 24 do not contact the top rod 32 of the top support 3 to form a fully unlocked state; the contact portion 23 of the handle 2 and the contact surface 321 make contact and the first abutting portion 241 makes contact with the interference portion 322 of the top support 3 to form a buffered unlocked state; the contact portion 23 of the handle 2 and the contact surface 321 make contact and the second abutting portion 242 makes contact with the locking portion 323 of the top support 3; and the operating portion 22 of the handle 2 and the buckle 13 of the base 1 are engaged and positioned to form a fully locked state. By means of the above, the fixing device can be locked at one time and unlocked steplessly to avoid damage to the fixing device caused by instantaneous rotational abutment stress.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Therefore, any simple modifications and equivalent structural changes made based on the description and drawings of the present invention should also be included within the patent scope of the present invention and are hereby stated.

Claims

1. A stepless unlocking fixing device, characterized in that, include: A base includes a bottom plate and two side plates, and the bottom plate and the two side plates form a receiving cavity. A through hole is provided in the middle of the bottom plate, and a buckle is provided on one side of the bottom plate. A lever includes a cam portion pivotally connected between the two side plates of the base and housed in the receiving cavity. The cam portion extends towards the latching direction and has an operating portion. On the side of the cam portion opposite to the operating portion, a protruding contact portion and an arcuate surface are formed. The arcuate surface has a first abutting portion near the contact portion and a second abutting portion away from the contact portion. A top support includes a positioning plate, and the positioning plate has an upwardly protruding through-hole that can extend into the base and a top rod that can enter the receiving cavity. The top side of the top rod has a contact surface, and a wider interference portion and a narrower locking portion are formed above the side of the top rod. The top rod is in a fully unlocked state when the contact portion does not contact the arc surface; a buffered unlocked state is formed when the contact portion contacts the contact surface and the first abutment portion contacts the interference portion; and a fully locked state is formed when the contact portion contacts the contact surface and the second abutment portion contacts the locking portion, and the operating portion engages with the latch.

2. The stepless unlocking fixing device as described in claim 1, characterized in that: The base has a first positioning groove on each side relative to the first side of the push rod, and the cam part of the lever has a shaft hole corresponding to the first positioning groove. The two first positioning grooves and the shaft hole are positioned by a pivot, thus forming a pivot connection structure between the base and the lever.

3. The stepless unlocking fixing device as described in claim 2, characterized in that: An elastic element is fitted around the outside of the pivot, and the two annular portions of the elastic element are located between the side plate of the base and the cam portion of the lever. A fixed section extends from the two annular portions toward the operating portion of the lever and abuts against the bottom positioning surface of the operating portion and is connected in a connecting manner. On the side opposite to the fixed section, the annular portions extend to two abutting sections that contact the bottom plate of the base. The elastic element is made of a torsion spring.

4. The stepless unlocking fixing device as described in claim 1, characterized in that: The base is provided with a second positioning groove on both sides relative to the second side of the top rod. The two second positioning grooves are for the stop rod that the top rod laterally supports to be positioned through.

5. The stepless unlocking fixing device as described in claim 1, characterized in that: The base plate has a bottom surface with at least one engaging body protruding downward for securing to a first fixing groove in a preset first plate.

6. The stepless unlocking fixing device as described in claim 1, characterized in that: The cam portion of the lever has an arc-shaped top surface that can avoid the stop bar, and the top surface extends forward to form a protruding contact portion.

7. The stepless unlocking fixing device as described in claim 1, characterized in that: The operating part of the lever has a slot through which the hook-shaped end of the latch is inserted and positioned.

8. The stepless unlocking fixing device as described in claim 1, characterized in that: The positioning plate of the top support has an anti-rotation directional cutting edge cut on one side, and the positioning plate with the anti-rotation directional cutting edge is fixed in the second fixing groove of the preset second plate.

9. The stepless unlocking fixing device as described in claim 1, characterized in that: The push rod of the top support has an inwardly tapered surface between the interference portion and the locking portion, while the locking portion has an outwardly tapered surface that allows the arc surface of the cam portion to avoid it.

10. A stepless unlocking fixing device, characterized in that, include: A base includes a bottom plate and two side plates, and the bottom plate and the two side plates form a receiving cavity. The bottom plate has buckles on both sides and a through hole in the middle. Two levers, identical in construction and symmetrically pivotally connected between the two side plates of the base, are each unlocked by rotating towards the center and locked by rotating towards the sides. Each lever includes a cam portion housed in the receiving cavity. The cam portion extends towards the latching direction and has an operating portion. On the side of the cam portion opposite to the operating portion, a protruding contact portion and an arcuate surface are formed. The arcuate surface has a first abutting portion near the contact portion and a second abutting portion away from the contact portion. A top support includes a positioning plate with an upwardly protruding through-hole that can extend into the base and a top rod that enters the receiving cavity. The top side of the top rod has a contact surface, and both sides of the top rod have an interference portion with a larger upper width and a locking portion with a smaller lower width. The top rod is fully unlocked when the contact portion does not contact the arc surface; it is buffered unlocked when the contact portion contacts the contact surface and the first abutment portion contacts the interference portion; and it is fully locked when the contact portion contacts the contact surface, the second abutment portion contacts the locking portion, and the operating portion engages with the buckle.

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