Bandage fastener
By designing a toothed strap and buckle to work together, the strap fastener achieves secure binding and easy release of items, solving the problem that existing rope fixing methods cannot guarantee the stability of items towed by cars, and improving the stability and safety of towed items.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 王玉丰
- Filing Date
- 2025-04-30
- Publication Date
- 2026-04-28
AI Technical Summary
Existing methods of securing items with ropes are insufficient to ensure the stability of goods towed by vehicles. In particular, during driving, vibrations and sharp turns can easily cause items to sway or fall off, posing a safety hazard.
Design a strap fastener, including a housing and a buckle assembly. The toothed strap uses a serrated structure on the toothed strap to cooperate with the beveled structure at the bottom of the buckle to achieve one-way locking and easy release of the toothed strap. Through the synergistic action of the toothed strap and the buckle, it achieves a secure binding of items. It is also equipped with an adjustment assembly, a locking assembly, and a gripping assembly to enhance stability and security.
It significantly improves the stability and safety of goods towed by cars, enhances ease of operation and user experience, and ensures that goods are not easily loosened while the vehicle is in motion, making it particularly suitable for occasions where reliable fixation is required.
Smart Images
Figure CN224170859U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of goods transportation technology, and in particular to a strap fastener. Background Technology
[0002] With the rapid development of highway transportation, more and more private car owners are choosing to drive their cars for both long and short distances, and the demand for towing various items in cars is also increasing, becoming a common phenomenon. However, people use cars to tow a wide variety of items, including many complex and easily swaying objects such as bicycles. How to securely and firmly fix these items to the rear rack of a car has become a major challenge. Currently, the common method is to use ropes to tie the items, but the tension of the ropes alone is insufficient to ensure the items are stably fixed to the rear rack. Especially during vehicle operation, road vibrations and sharp turns can easily cause the ropes to loosen, causing the items to sway or even fall off, posing a significant safety hazard. Utility Model Content
[0003] In view of this, the present invention proposes a strap fastener, which aims to solve the problem that existing rope fixing methods are difficult to effectively ensure the stability of goods towed by automobiles.
[0004] This utility model discloses a strap fastener, including a housing and a fastening assembly. The fastening assembly includes a toothed belt and a buckle. One end of the toothed belt is connected to one end of the housing, and the other end of the housing has a cavity through which the free end of the toothed belt passes. The toothed belt has a plurality of serrated structures. The buckle is rotatably connected to the inner wall of the cavity, and the bottom of the buckle has a beveled structure. When the free end of the toothed belt moves forward along the cavity, the serrated structures push the beveled structure to swing back and forth. When the free end of the toothed belt switches from forward movement to backward movement, the serrated structures lift up and lock the beveled structure. When the buckle rotates to a preset position, the toothed belt separates from the beveled structure, and the free end of the toothed belt can move backward along the cavity.
[0005] In one possible implementation, the buckle has a first support post at its bottom, and the strap fastener further includes an adjustment assembly, which includes a lever and a first torsion spring. The lever is rotatably connected to the inner wall of the cavity. The bottom of the lever has a second support post and a wedge-shaped structure. The first and second supports are located on the same side. The first torsion spring has a first bent portion and a second bent portion. The first bent portion is sleeved on the outside of the first support post, and the second bent portion is sleeved on the outside of the second support post. One torsion arm of the first torsion spring is connected to the lever, and the other torsion arm of the first torsion spring is connected to the buckle.
[0006] When the wedge structure swings forward, the wedge structure engages with the serrated structure and pushes the toothed belt forward. At the same time, the buckle lifts the inclined structure and separates it from the serrated structure through the first torsion spring.
[0007] When the wedge structure switches the forward swing to the reverse swing, the wedge structure and the toothed belt separate. At the same time, the latch drives the inclined structure to descend through the first torsion spring and return to a state that allows the free end of the toothed belt to move forward.
[0008] In one possible implementation, the strap fastener further includes a locking assembly comprising a lock body, a connecting arm, and a second torsion spring. One side of the lock body is connected to the housing, and the other side of the lock body is connected to one end of the connecting arm. The other end of the connecting arm is provided with a rotating shaft and a ramp structure. One torsion arm of the second torsion spring is connected to the connecting arm, and the other torsion arm of the second torsion spring is connected to the inner wall of the cavity. The bent part of the second torsion spring is sleeved on the outside of the rotating shaft.
[0009] When the lock body rotates to the unlock position, the lock body drives the ramp structure to rotate forward around the rotation axis through the connecting arm, so as to separate the ramp structure and the sawtooth structure. The second torsion spring supports the ramp structure to maintain the separated state.
[0010] When the lock body rotates to the locked position, the lock body drives the ramp structure to rotate in the opposite direction around the rotation axis through the connecting arm, so that the ramp structure can engage with the sawtooth structure, and the second torsion spring supports the ramp structure to maintain the engaged state.
[0011] In one possible implementation, the strap fastener further includes a gripping assembly comprising an upper clamp, a lower clamp, a connecting rod, a third torsion spring, and a fixing component. The connecting rod passes through one end of the upper clamp and one end of the lower clamp, and both the upper and lower clamps are rotatable around the connecting rod. One torsion arm of the third torsion spring is connected to the upper clamp, and the other torsion arm of the third torsion spring is connected to the lower clamp. The bent part of the third torsion spring is sleeved on the outside of the connecting rod, and one end of the fixing component is movably connected to the housing.
[0012] When the fixing component moves forward to the position of abutting the lower clamp, the fixing component pushes the other end of the lower clamp to rotate around the connecting rod to the position of fitting with the other end of the upper clamp, and the third torsion spring is in a taut state.
[0013] When the fixing component moves in the opposite direction to the position where it is separated from the lower clamp, the third torsion spring drives the other end of the lower clamp to rotate around the connecting rod to the position where it is separated from the other end of the upper clamp, and the third torsion spring is in a relaxed state.
[0014] In one possible implementation, the fixing component includes a movable part and a connecting post. The movable part is a hollow structure and includes an abutment block, a cylindrical body, and a rotating seat. One end of the cylindrical body is connected to the abutment block, and the other end of the cylindrical body is connected to the rotating seat. The abutment block is sleeved on the outer surface of one end of the connecting post, and the rotating seat is sleeved on the outer surface of the other end of the connecting post. The outer surface of the connecting post is provided with an external thread, and the inner wall of the rotating seat is provided with an internal thread that matches the external thread.
[0015] When the rotating seat moves up and down through the relative rotational motion between the internal thread and the external thread, the rotating seat causes the abutting block to separate from or abut against the lower clamp, so that the other end of the lower clamp can separate from or fit against the other end of the upper clamp.
[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: A strap fastener includes a housing and a fastening assembly. The fastening assembly includes a toothed belt and a buckle. One end of the toothed belt is connected to one end of the housing, and the other end of the housing has a cavity through which the free end of the toothed belt passes. The toothed belt has a plurality of serrated structures. The buckle is rotatably connected to the inner wall of the cavity, and the bottom of the buckle has a beveled structure. When the free end of the toothed belt moves forward along the cavity, the serrated structures push the beveled structure to swing back and forth. When the free end of the toothed belt switches from forward movement to backward movement, the serrated structures lift up and lock the beveled structure. When the buckle rotates to a preset position, the toothed belt separates from the beveled structure, and the free end of the toothed belt can move backward along the cavity. Therefore, this strap fastener, through the cooperation of the serrated structure on the toothed belt and the beveled structure at the bottom of the buckle, can achieve unidirectional locking and convenient release of the toothed belt. When using the toothed strap to secure items, the strap moves smoothly forward to accommodate items of different sizes. If the strap attempts to loosen backward, the buckle automatically engages to prevent it from coming loose, ensuring a stable and reliable binding force. To remove the item, the buckle can be rotated to a preset position, at which point the toothed strap separates from the beveled structure and can be easily pulled out of the housing cavity. This design not only significantly improves the stability and safety of towing items in a car but also greatly enhances user convenience and experience. Attached Figure Description
[0017] Figure 1 A schematic diagram of the strap fastener provided in this embodiment of the utility model;
[0018] Figure 2 This is a schematic diagram of the strap fastener provided in an embodiment of the present invention, with the housing removed.
[0019] Figure 3 A first structural schematic diagram of the fastening assembly, adjusting assembly, and locking assembly provided in an embodiment of this utility model;
[0020] Figure 4 for Figure 3 A magnified view of a portion of A;
[0021] Figure 5 This is a second structural schematic diagram of the fastening assembly, adjusting assembly, and locking assembly provided in an embodiment of the present utility model;
[0022] Figure 6 for Figure 5 A magnified view of part B;
[0023] Figure 7 This is a schematic diagram of the gripper assembly provided in an embodiment of the present utility model;
[0024] Figure 8 This is a structural disassembly diagram of the gripper assembly provided in an embodiment of the present utility model.
[0025] The annotations in the attached figures are explained as follows:
[0026] 10. Shell; 21. Toothed belt; 211. Serrated structure; 212. Buffer block; 22. Buckle; 221. Inclined structure; 222. First support column;
[0027] 31. Latch; 311. Second support; 312. Wedge structure; 32. First torsion spring; 41. Lock body; 42. Connecting arm; 421. Rotating shaft; 422. Ramp structure; 43. Second torsion spring;
[0028] 51. Upper clamp; 52. Lower clamp; 53. Connecting rod; 54. Third torsion spring; 551. Abutment block; 552. Cylinder; 553. Rotating seat; 56. Connecting column; 561. External thread. Detailed Implementation
[0029] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.
[0030] Please refer to Figure 1-2As shown, this utility model proposes a strap fastener, including a housing 10 and a fastening assembly. The fastening assembly includes a toothed belt 21 and a buckle 22. One end of the toothed belt 21 is connected to one end of the housing 10, and the other end of the housing 10 is provided with a cavity through which the free end of the toothed belt 21 passes. The toothed belt 21 is provided with a plurality of sawtooth structures 211. The buckle 22 is rotatably connected to the inner wall of the cavity, and the bottom of the buckle 22 is provided with a slope structure 221. When the free end of the toothed belt 21 moves forward along the cavity, the sawtooth structures 211 push the slope structure 221 to swing back and forth. When the free end of the toothed belt 21 switches from moving forward to moving backward, the sawtooth structures 211 lift up and lock the slope structure 221. When the buckle 22 rotates to a preset position, the toothed belt 21 separates from the slope structure 221, and the free end of the toothed belt 21 can move backward along the cavity.
[0031] Specifically, the toothed strap 21 is the strap used by the fastener to bind items. Through the coordinated action of the toothed strap 21 and the buckle 22, a secure binding of the item can be achieved. When the toothed strap 21 wraps around the item and is pulled forward to adjust the tightness of the binding, the serrated structure 211 on the toothed strap 21 causes the inclined structure 221 at the bottom of the buckle 22 to swing back and forth periodically. This swing does not hinder the forward movement of the toothed strap 21, allowing it to flexibly adapt to items of different sizes and adjust the binding position. When the free end of the toothed strap 21 attempts to move backward, it indicates that the toothed strap 21 is loosening. The serrated structure 211 immediately pushes up and locks the inclined structure 221, forming a reliable lock to prevent the toothed strap 21 from loosening and ensure the stability of the binding. When it is necessary to open the toothed belt 21 to remove an item, the buckle 22 is rotated to the preset position, causing the toothed belt 21 to separate from the inclined structure 221. The free end of the toothed belt 21 can then move smoothly backward to be pulled out of the cavity, thus loosening the toothed belt 21 and facilitating the removal of the item. With this mechanism, the strap fastener can stably and securely bind various items, and is especially suitable for applications requiring reliable fixation, such as the rear rack of a car.
[0032] In some embodiments of this application, the buckle 22 has a first support post 222 at its bottom, and the strap fastener also includes an adjustment component, which includes a lever 31 and a first torsion spring 32. The lever 31 is rotatably connected to the inner wall of the cavity. The bottom of the lever 31 has a second support post 311 and a wedge structure 312. The first support post 222 and the second support post 311 are located on the same side. The first torsion spring 32 has a first bending part and a second bending part. The first bending part is sleeved on the outside of the first support post 222, and the second bending part is sleeved on the outside of the second support post 311. One torsion arm of the first torsion spring 32 is connected to the lever 31, and the other torsion arm of the first torsion spring 32 is connected to the buckle 22.
[0033] When the wedge structure 312 swings forward, the wedge structure 312 engages with the sawtooth structure 211 and pushes the toothed belt 21 forward. At the same time, the buckle 31 drives the inclined structure 221 to lift up and separate from the sawtooth structure 211 through the first torsion spring 32.
[0034] When the wedge structure 312 switches from forward swing to reverse swing, the wedge structure 312 and the toothed belt 21 separate. At the same time, the buckle 31 drives the inclined structure 221 to descend through the first torsion spring 32 and return to the state that allows the free end of the toothed belt 21 to move forward.
[0035] Specifically, please refer to Figure 3-6 As shown, the housing 10 is provided with a through groove, and both the latch 22 and the lever 31 are located within the through groove. The top ends of both the latch 22 and the lever 31 extend out of the housing 10 through the through groove, allowing the user to directly operate the lever 31, improving the convenience and comfort of operation. Simultaneously, the through groove provides sufficient space for the latch 22 and the lever 31 to swing or rotate flexibly without being obstructed by the housing 10, ensuring smooth mechanical movement. When the user operates the lever 31 to make the wedge structure 312 swing forward, the wedge structure 312 engages with the serrated structure 211 on the toothed belt 21, pushing the toothed belt 21 forward to further tighten it. At the same time, the lever 31, with the help of the elastic force of the first torsion spring 32, lifts the inclined structure 221 at the bottom of the latch 22, separating it from the serrated structure 211, avoiding obstruction of the toothed belt 21's forward movement and ensuring smooth tightening. Conversely, when the user loosens the lever 31, causing the wedge structure 312 to switch from forward to reverse swing, the wedge structure 312 separates from the toothed belt 21. The lever 31, through the first torsion spring 32, drives the inclined structure 221 to descend and return to a state that allows the free end of the toothed belt 21 to move smoothly forward, ensuring that the toothed belt 21 can still be freely adjusted for tightness. In other words, this adjustment component, through the synergistic action of the wedge structure 312 of the lever 31, the serrated structure 211 of the toothed belt 21, the inclined structure 221 of the buckle 22, and the first torsion spring 32, achieves a fine adjustment function where "each flick of the lever 31 tightens the toothed belt 21." This design allows users to gradually tighten the toothed belt 21 as needed, providing stronger safety and security, and is particularly suitable for applications requiring high fixation strength.
[0036] In some embodiments of this application, the strap fastener further includes a locking assembly, which includes a lock body 41, a connecting arm 42, and a second torsion spring 43. One side of the lock body 41 is connected to the housing 10, and the other side of the lock body 41 is connected to one end of the connecting arm 42. The other end of the connecting arm 42 is provided with a rotating shaft 421 and a ramp structure 422. One torsion arm of the second torsion spring 43 is connected to the connecting arm 42, and the other torsion arm of the second torsion spring 43 is connected to the inner wall of the cavity. The bent body of the second torsion spring 43 is sleeved on the outside of the rotating shaft 421.
[0037] When the lock body 41 is rotated to the unlock position, the lock body 41 drives the ramp structure 422 to rotate in the forward direction around the rotation axis 421 through the connecting arm 42, so that the ramp structure 422 and the sawtooth structure 211 can be separated. The second torsion spring 43 supports the ramp structure 422 to maintain the separated state.
[0038] When the lock body 41 is rotated to the locked position, the lock body 41 drives the ramp structure 422 to rotate in the opposite direction around the rotation axis 421 through the connecting arm 42, so that the ramp structure 422 can engage with the sawtooth structure 211, and the second torsion spring 43 supports the ramp structure 422 to maintain the engaged state.
[0039] Specifically, one end of the lock body 41 is fixedly connected to the housing 10, and the other end drives the ramp structure 422 to rotate around the rotation axis 421 via the connecting arm 42. A second torsion spring 43 connects the connecting arm 42 to the housing 10, providing elastic support to ensure the ramp structure 422 remains stable under different conditions. When the user rotates the lock body 41 to the unlocked position using the key, the ramp structure 422 separates from the sawtooth structure 211, and the lock assembly does not have a locking function for the toothed band 21, facilitating adjustment of the tension of the toothed band 21. When the user rotates the lock body 41 to the locked position using the key, the ramp structure 422 engages with the sawtooth structure 211, achieving mechanical locking and providing further security, effectively preventing the toothed band 21 from loosening due to vibration or external force. This lock assembly, through manual control, further improves the stability, reliability, and security of the toothed band 21 based on the original adjustment mechanism, achieving a more robust locking effect.
[0040] In some embodiments of this application, the strap fastener further includes a gripping assembly, which includes an upper clamp 51, a lower clamp 52, a connecting rod 53, a third torsion spring 54, and a fixing component. The connecting rod 53 passes through one end of the upper clamp 51 and one end of the lower clamp 52, and both the upper clamp 51 and the lower clamp 52 can rotate around the connecting rod 53. One torsion arm of the third torsion spring 54 is connected to the upper clamp 51, and the other torsion arm of the third torsion spring 54 is connected to the lower clamp 52. The bent body of the third torsion spring 54 is sleeved on the outside of the connecting rod 53. One end of the fixing component is movably connected to the housing 10.
[0041] When the fixing component moves forward to the position of abutting the lower clamp 52, the fixing component pushes the other end of the lower clamp 52 to rotate around the connecting rod 53 to the position of fitting with the other end of the upper clamp 51, and the third torsion spring 54 is in a taut state.
[0042] When the fixing component moves in the opposite direction to the position where it is separated from the lower clamp 52, the third torsion spring 54 drives the other end of the lower clamp 52 to rotate around the connecting rod 53 to the position where it is separated from the other end of the upper clamp 51, and the third torsion spring 54 is in a relaxed state.
[0043] Specifically, please refer to Figure 7-8As shown, the clamp assembly is used to securely attach the strap fastener to the rear frame of a vehicle or other bracket. When not in use, the third torsion spring 54 provides elasticity, keeping the upper clamp 51 and lower clamp 52 open for quick installation when needed. Once the clamp assembly is correctly positioned on the rear frame, the fixing component can be moved forward to abut against the lower clamp 52. At this point, the lower clamp 52 is pushed by the fixing component to rotate around the connecting rod 53 and eventually engages with the upper clamp 51 to complete the clamping action, ensuring the strap fastener is securely attached to the rear frame. When the fixing component moves in the reverse direction to a position where it separates from the lower clamp 52, the third torsion spring 54 again causes the upper clamp 51 and lower clamp 52 to open, facilitating the removal or adjustment of the clamp assembly. In addition, when the other end of the upper clamp 51 and the other end of the lower clamp 52 are attached, they form an oblique closed line. Compared with a straight closed line, the oblique closed line has a certain mechanical self-locking effect, which can effectively prevent loosening caused by vibration or external force, enhance the locking reliability of the gripping assembly, and ensure the stability of the strap fastener during use.
[0044] In some embodiments of this application, the fixing component includes a movable part and a connecting post 56. The movable part has a hollow structure and includes an abutment block 551, a cylinder 552, and a rotating seat 553. One end of the cylinder 552 is connected to the abutment block 551, and the other end of the cylinder 552 is connected to the rotating seat 553. The abutment block 551 is sleeved on the outer surface of one end of the connecting post 56, and the rotating seat 553 is sleeved on the outer surface of the other end of the connecting post 56. The outer surface of the connecting post 56 is provided with an external thread 561, and the inner wall of the rotating seat 553 is provided with an internal thread that matches the external thread 561.
[0045] When the rotating seat 553 moves up and down through the relative rotational motion between the internal thread and the external thread 561, the rotating seat 553 drives the abutment block 551 to separate from or abut against the lower clamp 52, so that the other end of the lower clamp 52 can separate from or fit against the other end of the upper clamp 51.
[0046] Specifically, the rotating seat 553 moves up and down relative to the external thread 561 of the connecting column 56 via the internal thread of the rotating seat 553. This causes the abutment block 551 to separate from or abut against the lower clamp 52, thereby separating or engaging the other end of the lower clamp 52 with the other end of the upper clamp 51, thus completing the clamping or opening action. Furthermore, the bottom of the lower clamp 52 has a groove that matches the abutment block 551. When the abutment block 551 pushes the lower clamp 52 to clamp the upper clamp 51, the abutment block 551 can accurately extend into the groove and stably abut against the lower clamp 52, preventing lateral slippage and improving the firmness and reliability of the clamping. Moreover, the abutment block 551 adopts a smooth spherical design, facilitating smooth insertion into the groove, reducing jamming and wear, and improving the smoothness and durability of operation. It should be noted that the toothed belt 21 is also fitted with a U-shaped buffer block 212, so as to achieve a close fit with the contour of the bicycle, improve the uniformity of force distribution, prevent local damage to the tires and rims, and ensure the safety and stability of the bicycle when it is tied to the rear frame of the car.
Claims
1. A strap fastener, characterized in that, The device includes a housing and a fastening assembly. The fastening assembly includes a toothed belt and a buckle. One end of the toothed belt is connected to one end of the housing, and the other end of the housing has a cavity through which the free end of the toothed belt passes. The toothed belt has a plurality of serrated structures. The buckle is rotatably connected to the inner wall of the cavity, and the bottom of the buckle has a beveled structure. When the free end of the toothed belt moves forward along the cavity, the serrated structures push the beveled structure to swing back and forth. When the free end of the toothed belt switches from forward movement to backward movement, the serrated structures lift up and lock the beveled structure. When the buckle rotates to a preset position, the toothed belt separates from the beveled structure, and the free end of the toothed belt can move backward along the cavity.
2. The strap fastener according to claim 1, characterized in that, The buckle has a first support post at its bottom. The strap fastener also includes an adjustment component, which includes a lever and a first torsion spring. The lever is rotatably connected to the inner wall of the cavity. The lever has a second support post and a wedge-shaped structure at its bottom. The first and second supports are located on the same side. The first torsion spring has a first bent portion and a second bent portion. The first bent portion is sleeved on the outside of the first support post, and the second bent portion is sleeved on the outside of the second support post. One torsion arm of the first torsion spring is connected to the lever, and the other torsion arm of the first torsion spring is connected to the buckle. When the wedge structure swings forward, the wedge structure engages with the serrated structure and pushes the toothed belt forward. At the same time, the buckle lifts the inclined structure and separates it from the serrated structure through the first torsion spring. When the wedge structure switches the forward swing to the reverse swing, the wedge structure and the toothed belt separate. At the same time, the latch drives the inclined structure to descend through the first torsion spring and return to a state that allows the free end of the toothed belt to move forward.
3. The strap fastener according to claim 1, characterized in that, The strap fastener also includes a locking assembly, which includes a lock body, a connecting arm, and a second torsion spring. One side of the lock body is connected to the housing, and the other side of the lock body is connected to one end of the connecting arm. The other end of the connecting arm is provided with a rotating shaft and a ramp structure. One torsion arm of the second torsion spring is connected to the connecting arm, and the other torsion arm of the second torsion spring is connected to the inner wall of the cavity. The bent part of the second torsion spring is sleeved on the outside of the rotating shaft. When the lock body rotates to the unlock position, the lock body drives the ramp structure to rotate forward around the rotation axis through the connecting arm, so as to separate the ramp structure and the sawtooth structure. The second torsion spring supports the ramp structure to maintain the separated state. When the lock body rotates to the locked position, the lock body drives the ramp structure to rotate in the opposite direction around the rotation axis through the connecting arm, so that the ramp structure can engage with the sawtooth structure, and the second torsion spring supports the ramp structure to maintain the engaged state.
4. The strap fastener according to claim 1, characterized in that, The strap fastener also includes a gripping assembly, which includes an upper clamp, a lower clamp, a connecting rod, a third torsion spring, and a fixing component. The connecting rod passes through one end of the upper clamp and one end of the lower clamp, and both the upper clamp and the lower clamp can rotate around the connecting rod. One torsion arm of the third torsion spring is connected to the upper clamp, and the other torsion arm of the third torsion spring is connected to the lower clamp. The bent body of the third torsion spring is sleeved on the outside of the connecting rod. One end of the fixing component is movably connected to the housing. When the fixing component moves forward to the position of abutting the lower clamp, the fixing component pushes the other end of the lower clamp to rotate around the connecting rod to the position of fitting with the other end of the upper clamp, and the third torsion spring is in a taut state. When the fixing component moves in the opposite direction to the position where it is separated from the lower clamp, the third torsion spring drives the other end of the lower clamp to rotate around the connecting rod to the position where it is separated from the other end of the upper clamp, and the third torsion spring is in a relaxed state.
5. A strap fastener according to claim 4, characterized in that, The fixed component includes a movable part and a connecting column. The movable part is a hollow structure and includes an abutment block, a cylindrical body, and a rotating seat. One end of the cylindrical body is connected to the abutment block, and the other end of the cylindrical body is connected to the rotating seat. The abutment block is sleeved on the outer surface of one end of the connecting column, and the rotating seat is sleeved on the outer surface of the other end of the connecting column. The outer surface of the connecting column is provided with an external thread, and the inner wall of the rotating seat is provided with an internal thread that matches the external thread. When the rotating seat moves up and down through the relative rotational motion between the internal thread and the external thread, the rotating seat causes the abutting block to separate from or abut against the lower clamp, so that the other end of the lower clamp can separate from or fit against the other end of the upper clamp.