TWI898949B - Stepless unlocking fixture - Google Patents

Abstract

The present invention is a stepless unlocking fixing device, comprising: a base, comprising a bottom plate and two side plates, and surrounding a receiving cavity, a through hole being provided in the middle of the bottom plate and a buckle being provided on one side; a trigger, comprising a cam portion pivotally connected between the two side plates of the base and received in the receiving cavity, an operating portion extending from the cam portion in the direction of the buckle, and a buckle being formed on the other side of the cam portion opposite to the operating portion. There is a contact portion and an arc surface in the form of a protrusion, the arc surface forms a first supporting portion near the contact portion and a second supporting portion away from the contact portion; a top supporting seat includes a positioning plate and the positioning plate is upwardly protruded with a through hole that can be inserted into the base and a top rod that enters the accommodating cavity, the top side of the top rod is formed with a contact surface and a wider interference portion is formed above the side and a smaller locking portion is formed below.

Description

Stepless unlocking fixture

The present invention relates to a fixture with stepless unlocking, particularly a fixture in which the contact portion of the trigger of the fixture does not contact the arc surface of the top rod of the top support to form a completely unlocked state; the contact portion of the trigger contacts the contact surface and the first abutting portion contacts the interference portion of the top support to form a buffered unlocking state; the contact portion of the trigger contacts the contact surface and the second abutting portion contacts the locking portion of the top support, and the operating portion of the trigger is engaged and positioned with the buckle of the base to form a completely locked state. By the above-mentioned means, the fixture is locked once and the stepless buffered unlocking is achieved to prevent damage to the fixture due to instantaneous rotational abutment stress.

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 often assembled from multiple components, such as the outer casing of a computer, the circuit board and heat sink inside a television casing, or the desktop and supporting side panels of a desk. These components are often connected together using screws. This allows these industrial products to be disassembled into multiple components for easy transportation, and the assembled products can then be partially disassembled for repair or replacement.

Furthermore, because the components of these industrial products are assembled and connected via screws, the surfaces of the components subjected to pressure from the screw heads during assembly often suffer damage such as dents and cracks due to overtightening. To address this issue, some manufacturers use welding to secure components. However, this design makes it difficult to disassemble individual components of the assembled product, complicating repair and replacement.

Therefore, how to solve the various problems caused by the assembly methods of the components of the aforementioned industrial products is the direction that the relevant manufacturers engaged in this industry are eager to research and improve.

Therefore, in view of the above problems and deficiencies, the inventor collected relevant information and, after multiple evaluations and considerations, designed the invention of this stepless unlocking fixing device.

The main purpose of the present invention is to provide a stepless unlocking fixing device, comprising: a base, comprising a bottom plate and two side plates, and surrounding a receiving cavity, a through hole being provided in the middle of the bottom plate and a buckle being provided on one side; a trigger, comprising a cam portion pivotally connected between the two side plates of the base and received in the receiving cavity, an operating portion extending from the cam portion in the direction of the buckle, and a buckle on the other side of the cam portion opposite to the operating portion. One side is formed with a protruding contact portion and an arcuate surface. The arcuate surface has a first abutment portion formed near the contact portion and a second abutment portion formed away from the contact portion. A supporting base includes a positioning plate with an upwardly projecting through-hole extending into the base and a top rod extending into the accommodating cavity. The top rod has a contact surface formed on its top side, a wider interference portion formed above the side, and a narrower locking portion formed below. Through the above, the trigger's contact portion and the curved surface do not contact the top rod of the top support, forming a fully unlocked state; the trigger's contact portion contacts the contact surface, and the first abutment portion contacts the interference portion of the top support, forming a buffered unlocked state; the trigger's contact portion contacts the contact surface, the second abutment portion contacts the locking portion of the top support, and the trigger's operating portion and the base's buckle are engaged and positioned, forming a fully locked state. This achieves one-time locking of the fixture and stepless buffered unlocking, preventing damage to the fixture due to instantaneous rotational abutment stress.

The secondary purpose of the present invention is that the base is provided with first positioning grooves on both sides relative to the first side of the top rod, and the cam portion of the trigger is provided with an axis hole corresponding to the first positioning groove, and the two first positioning grooves and the axis hole are positioned through a pivot to form a pivot structure of the base and the trigger; and an elastic member is sleeved on the outside of the pivot, and the elastic member is provided. The two annular portions of the elastic member are located between the side plates of the base and the cam portion of the trigger. A fixed section extends from the two annular portions toward the operating portion of the trigger and abuts against the positioning surface on the bottom side of the operating portion and is in an annular shape. Two abutting sections extend from the other side of the annular portion opposite the fixed section and contact the bottom plate of the base. The elastic member is composed of a torsion spring.

Another object of the present invention is to provide a second positioning groove on both sides of the base relative to the second side of the top rod, and the two second positioning grooves are used for the blocking rods that are supported laterally by the top rod to penetrate and position; and the bottom surface of the bottom plate of the base is downwardly protruding with at least one engaging body for being fixed in the first fixing groove of the preset first plate.

Another object of the present invention is to form an arc-shaped top surface on the top side of the cam portion of the trigger that can avoid the blocking rod, and the top surface extends forward to form the contact portion in a protruding shape; and a card slot is formed in the operating portion of the trigger, and the card slot is used for the hook-shaped clip at the end to extend into and position it.

Another object of the present invention is to form an anti-rotation directional cutting edge on one side of the positioning plate of the top support seat, and the positioning plate with the anti-rotation directional cutting edge is clamped in the second fixing groove of the preset second plate; and the top rod of the top support seat is formed with a tapered surface that is beveled inward between the interference portion and the locking portion, and the locking portion is downwardly formed with an outward beveled inclined surface for the arc surface of the cam portion to avoid.

In order to achieve the above-mentioned objectives and effects, the technical means and structures adopted by the present invention are described in detail with reference to the preferred embodiments of the present invention, and their features and functions are described below for a complete understanding.

Please refer to Figures 1-6, which respectively show the fixing device of the present invention in a perspective view, a perspective exploded view, a perspective exploded view from another angle, a side cross-sectional view in a fully unlocked state, a side cross-sectional view in a buffered unlocked state, and a side cross-sectional view in a fully locked state. As can be clearly seen from the figures, the fixing device of the present invention mainly includes a base 1, a trigger 2, and a top support 3. Its main components and features are detailed as follows:

The base 1 includes a bottom plate 11 and two side plates 12 and surrounds a receiving cavity 10 . A through hole 110 is defined in the center of the bottom plate 11 and a buckle 13 is defined on one side.

The trigger 2 includes a cam portion 21 pivotally connected between the two side panels 12 of the base 1 and housed in the accommodating cavity 10. The cam portion 21 extends toward the buckle 13 to form an operating portion 22. A contact portion 23 and an arcuate surface 24 are formed on the other side of the cam portion 21 opposite the operating portion 22. The arcuate surface 24 has a first abutting portion 241 formed near the contact portion 23 and a second abutting portion 242 formed away from the contact portion 23.

The top support 3 includes a positioning plate 31 and the positioning plate 31 is provided with a top rod 32 that can be inserted into the through hole 110 of the base 1 and into the accommodating cavity 10. The top side of the top rod 32 is formed with a contact surface 321 and an interference portion 322 with a larger width is formed above the side and a locking portion 323 with a smaller width is formed below. The top rod 32 forms a completely unlocked state; the contact portion 23 forms a contact with the contact surface 321 and the first abutting portion 241 forms a contact with the interference portion 322 to form a buffer unlocked state; the contact portion 23 forms a contact with the contact surface 321 and the second abutting portion 242 forms a contact with the locking portion 323, and the operating portion 22 and the buckle 13 are engaged and positioned to form a completely locked state.

The base 1 is provided with a first positioning groove 14 on both sides relative to the first side of the top rod 32, and the cam portion 21 of the trigger 2 is provided with an axis hole 210 corresponding to the first positioning groove 14. The two first positioning grooves 14 and the axis hole 210 are positioned through a pivot 25 to form a pivot structure of the base 1 and the trigger 2; and the pivot 25 is provided with an elastic member 26 on the outside, and the two annular portions 2 of the elastic member 26 are provided. 61 is located between the side plate 12 of the base 1 and the cam portion 21 of the trigger 2. A fixed section 262 extends from the two annular portions 261 toward the operating portion 22 of the trigger 2 and abuts against the bottom positioning surface 221 of the operating portion 22 and is in an annular shape. Two abutting sections 263 extend from the other side of the annular portion 261 opposite the fixed section 262 and contact the bottom plate 11 of the base 1. The elastic member 26 is composed of a torsion spring.

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 used to provide a positioning for the stop rod 16 that the top rod 32 laterally supports. The bottom surface of the bottom plate 11 of the base 1 is provided with at least one engaging body 17 that protrudes downward and is fixed in the first fixing groove 41 of the preset first plate 4.

The cam portion 21 of the trigger 2 has an arc-shaped top surface 211 formed on the top side thereof, which can avoid the blocking rod. The top surface 211 extends forward to form the contact portion 23 in a protruding shape. A slot 222 is formed in the operating portion 22 of the trigger 2, and the hook-shaped clip 13 at the end of the slot 222 is inserted into and positioned.

The positioning plate 31 of the above-mentioned top support seat 3 is cut on one side to form an anti-rotation directional cutting edge 311, and the positioning plate 31 with the anti-rotation directional cutting edge 311 is clamped in the second fixing groove 51 of the preset second plate 5; and the top rod 32 of the top support seat 3 is formed with a tapered surface 324 that is beveled inward between the interference portion 322 and the locking portion 323, and the locking portion 323 is downwardly formed with an outward beveled inclined surface 325 for the arc surface 24 of the cam portion 21 to dodge.

To assemble the fixing device of the present invention, first align the two annular portions 261 of the elastic member 26 with the two sides of the axial hole 210 of the trigger 2, and the fixing section 262 abuts the positioning surface 221 on the bottom side of the operating portion 22. Next, the trigger 2 is placed into the base 1, with the axial hole 210 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 then inclined to contact the bottom plate 11 of the base 1. Finally, the blocking rod 16 is inserted into the two second positioning grooves 15 of the base 1 to complete the assembly of the base 1 and the trigger 2. The assembled structure of base 1 and trigger 2 is secured by two engaging members on the bottom side of base 1 in first fixing slots 41 of first plate 4, completing the assembly structure of base 1, trigger 2, and first plate 4. Furthermore, the positioning plate 31 of support base 3 is secured in second fixing slots 51 of second plate 5, completing the assembly structure of support base 3 and second plate 5.

Please refer to Figure 4, which shows that the base 1 and the trigger 2 are fixed on the first plate 4 and the top support 3 is fixed on the second plate 5. This is the fully unlocked state of the fixing device. Please refer to Figure 5, when the first plate 4 is moved downward close to the second plate 5, the top rod 32 of the top support 3 extends into the through hole 110 of the base 1 and enters the accommodating cavity 10. The contact surface 321 of the top rod 32 and the contact portion 23 of the trigger 2 first form contact and abutment. Then, the trigger 2 is pushed to rotate clockwise. Then, the top support The interference portion 322 of the seat 3 and the first abutting portion 241 of the trigger 2 also form contact and abutment, generating relatively small interference resistance (because the first abutting portion 241 is closer to the shaft hole 210). This is the buffered unlocking state of the fixing device, which can buffer the rotational abutment stress generated by the trigger 2 during the locking process and effectively avoid overall damage to the fixing device. Please refer to Figure 6. 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 blocking position, at the same time, the top rod 32 also pushes the trigger 2 to rotate, and the contact portion 23 of the trigger 2 and the contact surface 321 of the top rod 32 are kept in contact and abutment; the second abutting portion 242 is in contact and abutment with the locking portion 323 of the top support 3 and A greater interference resistance is generated (because the second supporting portion 242 is farther from the shaft hole 210); then force is applied to the operating portion 22 of the trigger 2 so that the slot 222 and the buckle 13 of the base 1 are engaged and positioned, and the elastic member 26 is compressed. This is the complete locking state of the fixing device, allowing the first plate 4 and the second plate 5 to form a combined fixed structure.

To separate and disassemble the first plate 4 from the second plate 5, first apply force to pull the hook-shaped buckle 13 located in the slot 222 of the trigger 2 outward to form a non-interference state. The elastic member 26 then exerts a restoring stretching force, causing the trigger 2 to rotate counterclockwise and disengage from the buckle 13. Then, force is applied to the operating portion 22 of the trigger 2 to pull up, causing the contact portion 23 of the trigger 2 to continuously press on the contact surface 321 of the top support 3, thereby moving the first plate 4 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 above operations complete the separation and disassembly of the first plate 4 and the second plate 5.

Please refer to Figures 7 to 10, which are respectively a three-dimensional external view, a three-dimensional exploded view, a three-dimensional exploded view from another viewing angle, and a side cross-sectional view of another embodiment of the fixing device of the present invention. The difference between the disclosed embodiment and the one disclosed in Figures 1 to 6 is that the present embodiment uses two identically structured side panels 1 symmetrically pivoted to the base 1. 2; both triggers 2 are rotated toward the center to unlock and toward the sides to lock; both sides of the top rod 32 of the top support 3 are formed with an upper interference portion 322 and a lower locking portion 323. The advantage of this embodiment is that the two triggers 2 generate a greater locking force to achieve a better locking effect. Its main components and features are detailed as follows:

A base 1 includes a bottom plate 11 and two side plates 12 and surrounds a receiving cavity 10. Buckles 13 are provided on both sides of the bottom plate 11 and a through hole 110 is provided in the middle.

Two triggers 2 are identical in structure and symmetrically pivoted between the two side panels 12 of the base 1. Both triggers 2 are unlocked by rotating toward the center and locked by rotating toward the sides. Each trigger 2 includes a cam portion 21 housed in the accommodating cavity 10. The cam portion 21 has an operating portion 22 extending toward the buckle 13. A protruding contact portion 23 and an arcuate surface 24 are formed on the other side of the cam portion 21 opposite the operating portion 22. The arcuate surface 24 has a first abutting portion 241 formed near the contact portion 23 and a second abutting portion 242 formed away from the contact portion 23.

A top support 3 includes a positioning plate 31 and a top rod 32 protruding upwardly from the positioning plate 31 and capable of extending into the through hole 110 of the base 1 and into the accommodating cavity 10. The top side of the top rod 32 is formed with a contact surface 321 and an interference portion 322 with a larger width on the upper side and a locking portion 323 with a smaller width on the lower side. Touching the top rod 32 forms a completely unlocked state; based on the contact portion 23 and the contact surface 321 forming contact and the first abutting portion 241 and the interference portion 322 forming contact, a buffer unlocked state is formed; based on the contact portion 23 and the contact surface 321 forming contact and the second abutting portion 242 and the locking portion 323 forming contact, and the operating portion 22 and the buckle 13 are engaged and positioned to form a completely locked state.

Please refer to Figures 11 and 12, which are three-dimensional external views of an embodiment of the fixing device 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 trigger 2 of the fixing device refers to a metal plate installed on the edge of a heat sink 42 on the surface of an electronic component that is prone to generating high temperatures (such as a central processing unit (CPU), a graphics processing unit (GPU), a microcontroller unit (MCU), or a power supply component); and the second plate 5 assembled on the bottom side of the top support 3 refers to a metal plate fixed to the edge of a socket (not shown) for a high-temperature electronic component on a circuit board (PCB). When the first plate 4 at the edge of the heat sink fin 42 is provided with four sets of base 1 and trigger 2 combination structures and the second plate 5 at the edge of the socket is provided with four supporting bases 3, and the four triggers 2 are arranged in groups of two and are each provided with a connecting rod 27 for interconnecting them. When the four triggers 2 connected by the two connecting rods 27 are all approximately perpendicular to the base 1, a fully unlocked state is formed; when the two connecting rods 27 are rotated outward and the four triggers 2 are approximately horizontal and locked in place at the buckle 13, a fully locked state is formed; when the two connecting rods 27 are rotated outward and the four triggers 2 are angled between 1 and 89 degrees, a buffered unlocked state is formed. Through the above-mentioned embodiment, the heat sink fin 42 and the socket on the circuit board can be quickly assembled and disassembled and the stepless buffer unlocking operation can be achieved.

The main features of the present invention are that the contact portion 23 of the trigger 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 completely unlocked state; the contact portion 23 of the trigger 2 forms contact with the contact surface 321 and the first abutting portion 241 contacts the interference portion 322 of the top support 3 to form a buffered unlocked state; the contact portion 23 of the trigger 2 and the contact surface 321 form contact and the first abutting portion 241 contacts the interference portion 322 of the top support 3 to form a buffered unlocked state. The contact surface 321 forms contact, the second abutting portion 242 contacts the locking portion 323 of the top support 3, and the operating portion 22 of the trigger 2 is engaged and positioned with the buckle 13 of the base 1 to form a fully locked state. By the above, the purpose of one-time locking of the fixing device and stepless buffered unlocking is achieved to prevent the fixing device from being damaged by instantaneous rotational abutting stress.

The above is merely 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 by applying the contents of the description and drawings of the present invention should be included in the patent scope of the present invention and should be disclosed.

In summary, the above-mentioned stepless unlocking fixing device of this invention can truly achieve its efficacy and purpose when used. Therefore, this invention is truly an invention with excellent practicality. In order to meet the application requirements for invention patents, an application has been submitted in accordance with the law. We hope that the Review Committee will approve this case as soon as possible to protect the inventor's hard work in research and development. If the Review Committee of the Jun Bureau has any questions, please feel free to write to us for instructions. The inventor will do his best to cooperate and will be grateful for the convenience.

1: Base 10: Receiving cavity 11: Bottom plate 110: Perforation 12: Side plate 13: Snap-on catch 14: First positioning slot 15: Second positioning slot 16: Stopper 17: Snap-on body 2: Trigger 21: Cam 210: Axis hole 211: Top surface 22: Operating portion 221: Positioning surface 222: Slot 23: Contact portion 24: Arc surface 241: First abutment portion 242: Second abutment portion 25: Pivot 26: Elastic member 261: Ring portion 262: Fixing section 263: Abutment section 27: Connecting rod 3: Top support 31: Positioning plate 311: Anti-rotation cutting edge 32: Top bar 321: Contact surface 322: Interference area 323: Locking area 324: Gradient surface 325: Inclined surface 4: First plate 41: First fixing groove 42: Heat sink fin 5: Second plate 51: Second fixing groove

[Figure 1] is a perspective view of the fixing device of the present invention. [Figure 2] is an exploded perspective view of the fixing device of the present invention. [Figure 3] is an exploded perspective view of the fixing device of the present invention from another angle. [Figure 4] is a side cross-sectional view of the fixing device of the present invention in the fully unlocked state. [Figure 5] is a side cross-sectional view of the fixing device of the present invention in the buffer unlocked state. [Figure 6] is a side cross-sectional view of the fixing device of the present invention in the fully locked state. [Figure 7] is a perspective view of another embodiment of the fixing device of the present invention. [Figure 8] is an exploded perspective view of another embodiment of the fixing device of the present invention. Figure 9 is an exploded perspective view of another embodiment of the fastening device of the present invention from another angle. Figure 10 is a side cross-sectional view of another embodiment of the fastening device of the present invention in the buffer unlocked state. Figure 11 is a perspective exterior view of the fastening device embodiment of the present invention in the fully unlocked state. Figure 12 is a perspective exterior view of the fastening device embodiment of the present invention in the fully locked state.

1: Base

10: Storage chamber

11: Base Plate

12:Side panel

13: Buckle

14: First positioning groove

15: Second positioning slot

16: Stop rod

2: Trigger

21: Cam

210:Shaft hole

211: Top

22: Operation Department

221: Positioning surface

222: Card slot

23: Contact area

24: Curved surface

241: First support part

242: Second supporting portion

25: Pivot

26: Elastic parts

261: Ring

262: Fixed segment

263: Support Section

3: Supporting seat

31: Positioning plate

311: Anti-rotation directional cutting edge

32: Top shot

321: Contact surface

4: First board

41: First fixing slot

5: Second board

51: Second fixing slot

Claims (10)

A stepless unlocking fixing device comprises: A base comprising a bottom plate and two side plates, each of which encloses a receiving cavity, a through-hole being provided in the center of the bottom plate and a latch being provided on one side; A trigger comprising a cam portion pivotally connected between the two side plates of the base and received in the receiving cavity, an operating portion extending from the cam portion toward the latch, and a contact portion and an arcuate surface formed on the other side of the cam portion opposite the operating portion. The arcuate surface has a first abutment portion formed near the contact portion and a second abutment portion formed distal to the contact portion; and A top support seat includes a positioning plate and a top rod protruding upward from the positioning plate and capable of extending into the through hole of the base and the accommodating cavity. The top side of the top rod is formed with a contact surface and an interference portion with a larger width is formed above the side and a locking portion with a smaller width is formed below. The top lever is in a fully unlocked state; the contact portion contacts the contact surface, and the first abutting portion contacts the interference portion, forming a buffered unlocked state; the contact portion contacts the contact surface, the second abutting portion contacts the locking portion, and the operating portion and the buckle are engaged and positioned to form a fully locked state. As described in claim 1, the fixing device with stepless unlocking is provided with a first positioning groove on both sides of the base relative to the first side of the top rod, and an axis hole is provided in the cam portion of the trigger corresponding to the first positioning groove, and the two first positioning grooves and the axis hole are positioned by a pivot shaft to form a pivot structure between the base and the trigger. A stepless unlocking fixing device as described in claim 2, wherein an elastic member is sleeved on the outside of the pivot, and two annular portions of the elastic member are located between the side plate of the base and the cam portion of the trigger, and a fixing section extends from the two annular portions toward the operating portion of the trigger, which is supported by the bottom positioning surface of the operating portion and is in a joint shape, and two supporting sections in contact with the bottom plate of the base extend from the other side of the annular portion opposite to the fixing section, and the elastic member is composed of a torsion spring. As described in claim 1, the fixing device with stepless unlocking, wherein the base is provided with second positioning grooves on both sides relative to the second side of the top rod, and the two second positioning grooves are used for positioning the stop rod that is supported laterally by the top rod. As described in claim 1, the fixing device with stepless unlocking, wherein the bottom surface of the bottom plate of the base is protruded downward and has at least one engaging body for being fixed in the first fixing groove of the preset first plate. As described in claim 1, the fixing device with stepless unlocking, wherein the top side of the cam portion of the trigger is formed with a top surface that is arc-shaped and can avoid the blocking rod, and the top surface extends forward with the contact portion in a protruding shape. As described in claim 1, the fixing device for stepless unlocking has a slot provided in the operating portion of the trigger, and the slot is used for the hook-shaped clip at the end to be inserted and positioned. As described in claim 1, the stepless unlocking fixing device, wherein one side of the positioning plate of the top support is cut to form an anti-rotation directional cutting edge, and the positioning plate with the anti-rotation directional cutting edge is clamped in the second fixing groove of the preset second plate. As described in claim 1, the stepless unlocking fixing device, wherein the top rod of the top support seat forms a tapered surface that is beveled inward between the interference portion and the locking portion, and the locking portion forms a beveled surface that is beveled outward downward and for the arc surface of the cam portion to avoid. A stepless unlocking fixing device comprises: A base comprising a bottom plate and two side plates, each of which encloses a receiving cavity. A latch is provided on each side of the bottom plate, and a through-hole is provided in the center. Two triggers, each having the same structure and symmetrically pivoted between the two side plates of the base, are each unlocked by rotating toward the center and locked by rotating toward the sides. A single trigger comprises a cam portion received in the receiving cavity, an operating portion extending from the cam portion toward the latch. A contact portion and an arcuate surface are formed on the side of the cam portion opposite the operating portion. The arcuate surface has a first abutment portion formed near the contact portion and a second abutment portion formed distal to the contact portion. A top support seat includes a positioning plate and a top rod protruding upwardly from the positioning plate and capable of extending into the through hole of the base and the accommodating cavity. The top side of the top rod is formed with a contact surface and an interference portion with a larger width on the upper side and a locking portion with a smaller width on the lower side are formed on both sides. The top lever is touched to form a fully unlocked state; the contact portion contacts the contact surface and the first abutting portion contacts the interference portion to form a buffered unlocked state; the contact portion contacts the contact surface and the second abutting portion contacts the locking portion, and the operating portion and the buckle are engaged and fixed to form a fully locked state.