An automatic telescopic belt tensioner

Abstract

This utility model discloses an automatic retractable strap tensioner, belonging to the technical field of strap tensioners. It aims to solve the problem that existing strap tensioners lack a flexible and convenient braking structure, easily causing the strap to spring back when contracting, thus potentially injuring nearby workers. The key technical points include a base, inside which a winding drum is rotatably connected via a linkage shaft. A ratchet is fixedly connected to each end of the winding drum. A rotating mounting hole is provided on each of the symmetrical side surfaces of the base. A second locking device is rotatably installed between the two rotating mounting holes. One edge of the second locking device engages in the ratchet groove of the ratchet. Second torsion springs are externally sleeved on the rotating parts at both ends of the second locking device. This achieves a braking operation, effectively preventing the strap from springing back when contracting, thereby avoiding injury to nearby workers.

Description

Technical Field

[0001] This utility model relates to the field of belt tensioner technology, and in particular to an automatic telescopic belt tensioner. Background Technology

[0002] The strap tensioner is a convenient and efficient fastening tool. It consists of a handle, ratchet, buckle, and high-strength strap. With simple operation, it can quickly tighten and securely lock the strap, effectively preventing the bundled object from loosening.

[0003] Existing belt tensioners lack a flexible and convenient braking structure, which can easily cause the belt to spring back when it contracts, potentially leading to injuries to nearby workers. Utility Model Content

[0004] The purpose of this invention is to provide an automatic retractable belt tensioner that can perform a braking operation, effectively preventing the belt from rebounding when it retracts, thereby preventing the belt rebound from causing injury to surrounding workers.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An automatic retractable strap tensioner includes a base. A winding drum is rotatably connected to the interior of the base via a linkage shaft. A ratchet is fixedly connected to each end of the winding drum. A rotating mounting hole is provided on each symmetrical side surface of the base. A second locking device is rotatably mounted between the two rotating mounting holes. One edge of the second locking device engages with the ratchet groove of the ratchet. A second torsion spring is sleeved on the external rotating parts at both ends of the second locking device. The two compressible ends of the second torsion spring abut against the outer surface of one side of the second locking device and the inner wall of the base, respectively. A linkage protrusion is provided at each of the symmetrical ends of one side edge of the second locking device.

[0007] By adopting the above technical solution, the tensioner is equipped with a braking structure, which can effectively prevent the belt from springing back when it retracts, thus effectively improving safety.

[0008] Furthermore, a movable arm is rotatably mounted on the inner side of the base, and the movable arm shares a central axis with the winding drum. A first movable through groove is provided on each of the symmetrical side surfaces of the movable arm. A first locking device is slidably mounted between the two first movable through grooves, and one end of the first locking device is engaged in the ratchet groove of the ratchet.

[0009] By adopting the above technical solution, the ratchet can be limited using the first locking device.

[0010] Furthermore, a connecting block is provided on the inner side of the first movable through groove, and a first torsion spring is sleeved on the outside of the connecting block. One end of the first torsion spring is snapped into the mounting hole on the outer surface of the first latch, and the other end of the first torsion spring abuts against the inner side of the movable arm.

[0011] By adopting the above technical solution, the first locking device can be engaged in the ratchet groove of the ratchet in real time.

[0012] Furthermore, a spring seat is installed on one outer surface of the base, and a spring coil is installed inside the spring seat. The linkage shaft is engaged with the winding drum, and the linkage shaft and the winding drum rotate synchronously. One end of the linkage shaft is provided with a slot, and one end of the spring coil is engaged and installed in the slot.

[0013] By adopting the above technical solution, the tape can be automatically retracted.

[0014] Furthermore, a second movable through groove is provided on each of the symmetrical side surfaces of the base, and a limiting piece is slidably installed between the two second movable through grooves. A connecting strip is provided at the middle position of one side edge of the limiting piece. An inclined mounting piece is integrally connected to the inner end face of the base. A through hole is provided on the outer surface of the mounting piece. The connecting strip passes through the through hole, and a spring is sleeved on the outside of the connecting strip. One end of the connecting strip is sleeved and fixedly connected to the limiting end block.

[0015] By adopting the above technical solution, the wound tape can be tightened.

[0016] Furthermore, a housing is fastened to the outside of the base, and a through groove for a strap is provided on the side surface of the housing.

[0017] By adopting the above technical solution, the entire tensioner can be wrapped and protected.

[0018] In summary, the beneficial technical effects of this utility model are as follows:

[0019] This invention utilizes a winding drum to wind a tape. When the tape is pulled, the movable arm rotates, engaging the first locking device, causing it to slide within the first movable groove. One end of the first locking device then moves out of the ratchet groove of the ratchet. When the movable arm is in a vertical position, the first locking device is released, releasing the compressed first torsion spring. This causes one end of the first locking device to press against the linkage protrusion, which in turn drives the second locking device to rotate, allowing one end of the second locking device to move out of the ratchet groove. The winding drum and ratchet can then rotate freely, facilitating the convenient movement of the tape. When automatic tape retraction is required, the first locking device is engaged, and the movable arm is simultaneously engaged... As the arm rotates, the first locking device no longer presses against the linkage protrusion. At this time, the compression force of the second torsion spring is released, causing the second locking device to reposition itself in the ratchet groove of the ratchet. Then, the first locking device is released, and the first torsion spring causes one end of the first locking device to reposition itself in the ratchet groove of the ratchet. At this time, the first and second locking devices can control the unidirectional rotation of the ratchet. The compressed spring coil is released, causing the winding drum and ratchet to rotate. The winding drum winds and collects the tape. When the tape is finished winding, because the first and second locking devices are engaged in the ratchet groove of the ratchet, the winding drum can be effectively prevented from springing back, thus preventing the tape from springing back and causing injury to surrounding workers. Both safety and practicality are effectively improved. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is an exploded view of the three-dimensional structure of this utility model.

[0022] In the diagram: 1. Base; 2. Housing; 3. Movable arm; 4. First locking device; 5. First torsion spring; 6. First movable through slot; 7. Connecting block; 8. Winding drum; 9. Ratchet; 10. Second locking device; 11. Second torsion spring; 12. Linkage protrusion; 13. Spring seat; 14. Mounting plate; 15. Second movable through slot; 16. Limiting plate; 17. Spring; 18. Linkage shaft; 19. Rotary mounting hole; 20. Strap through slot. Detailed Implementation

[0023] The method of this utility model will be further described in detail below with reference to the accompanying drawings.

[0024] Reference Figure 1 , Figure 2An automatic retractable strap tensioner includes a base 1. A winding drum 8 is rotatably connected inside the base 1 via a linkage shaft 18. A ratchet 9 is fixedly connected to each end of the winding drum 8. A rotating mounting hole 19 is provided on each symmetrical side surface of the base 1. A second locking device 10 is rotatably mounted between the two rotating mounting holes 19. One edge of the second locking device 10 engages in the ratchet groove of the ratchet 9. Second torsion springs 11 are sleeved on the external rotating parts at both ends of the second locking device 10. The two compressible ends of the second torsion springs 11 abut against the outer surface of one side of the second locking device 10 and the inner wall of the base 1, respectively. A linkage protrusion 12 is provided at each symmetrical end of one side edge of the second locking device 10. The inner surface of the base 1... A movable arm 3 is mounted on the side, and the movable arm 3 shares a central axis with the winding drum 8. A first movable through groove 6 is provided on each symmetrical side surface of the movable arm 3. A first locking device 4 is slidably installed between the two first movable through grooves 6. One end of the first locking device 4 is engaged in the ratchet groove of the ratchet 9. A connecting block 7 is provided on the inner side of the first movable through groove 6. A first torsion spring 5 is sleeved on the outside of the connecting block 7. One end of the first torsion spring 5 is snapped into the mounting hole on the outer surface of the first locking device 4, and the other end of the first torsion spring 5 abuts against the inner side of the movable arm 3. A housing 2 is fastened to the outside of the base 1. A strip through groove 20 is provided on the side surface of the housing 2, through which the strip can be wound using the winding drum 8. When the belt is pulled, the movable arm 3 rotates, which engages the first locking device 4, causing it to slide inside the first movable through groove 6. At this point, one end of the first locking device 4 moves out of the ratchet groove of the ratchet 9. When the movable arm 3 is in a vertical position, the first locking device 4 is released, releasing the compressed first torsion spring 5. This causes one end of the first locking device 4 to press against the linkage protrusion 12, which in turn drives the second locking device 10 to rotate. This allows one end of the second locking device 10 to move out of the ratchet groove of the ratchet 9. The winding drum 8 and the ratchet 9 can then rotate freely, facilitating the pulling of the belt. When automatic belt retraction is required, the first locking device 4 is engaged, and the movable arm 3 rotates simultaneously, causing the first locking device 4 to no longer press against the ratchet groove. Pressing the linkage protrusion 12 releases the compression force of the second torsion spring 11, causing the second locking device 10 to reposition itself in the ratchet groove of the ratchet 9. Then, the first locking device 4 is released, and the first torsion spring 5 causes one end of the first locking device 4 to reposition itself in the ratchet groove of the ratchet 9. At this time, the first locking device 4 and the second locking device 10 can control the unidirectional rotation of the ratchet 9. The compressed spring coil is released, causing the winding drum 8 and the ratchet 9 to rotate. The winding drum 8 winds and collects the tape. When the tape is wound, because the first locking device 4 and the second locking device 10 are engaged in the ratchet groove of the ratchet 9, the winding drum 8 can be effectively prevented from springing back, thereby preventing the tape from springing back and causing injury to the surrounding workers. Both safety and practicality are effectively improved.

[0025] Reference Figure 1 , Figure 2 A spring seat 13 is installed on one outer surface of the base 1. A spring coil is installed inside the spring seat 13. The linkage shaft 18 is engaged with the winding drum 8 and the linkage shaft 18 and the winding drum 8 rotate synchronously. One end of the linkage shaft 18 is provided with a slot, and one end of the spring coil is engaged in the slot. The spring coil can provide torque for the rotation of the linkage shaft 18 and the winding drum 8, ensuring that the belt can effectively perform automatic retraction operation.

[0026] Reference Figure 2 A second movable through groove 15 is provided on each of the symmetrical side surfaces of the base 1. A limiting piece 16 is slidably installed between the two second movable through grooves 15. A connecting strip is provided at the middle position of one side edge of the limiting piece 16. An inclined mounting piece 14 is integrally connected to the inner end face of the base 1. A through hole is provided on the outer surface of the mounting piece 14. The connecting strip passes through the through hole and a spring 17 is sleeved on the outside of the connecting strip. One end of the connecting strip is sleeved and fixedly connected to the limiting end block. The limiting piece 16 can be used to press the wound strip to prevent the wound strip from becoming loose.

[0027] Working principle: In use, the winding drum 8 winds the tape. When the tape is pulled, the movable arm 3 rotates, which engages the first locking device 4, causing it to slide inside the first movable groove 6. At this time, one end of the first locking device 4 moves out of the ratchet groove of the ratchet 9. When the movable arm 3 is in a vertical position, the first locking device 4 is released, and the compressed first torsion spring 5 is released, causing one end of the first locking device 4 to press against the linkage protrusion 12. This drives the second locking device 10 to rotate, allowing one end of the second locking device 10 to move out of the ratchet groove of the ratchet 9. At this time, the winding drum 8 and the ratchet 9 can rotate freely, making it easy to pull the tape. When automatic tape retraction is required, the first locking device 4 is engaged, and the movable arm is moved simultaneously. 3. When the first locking device 4 is rotated, it no longer presses against the linkage protrusion 12. At this time, the compression force of the second torsion spring 11 is released, causing the second locking device 10 to be placed back into the ratchet groove of the ratchet 9. Then, the first locking device 4 is released, and the first torsion spring 5 causes one end of the first locking device 4 to be placed back into the ratchet groove of the ratchet 9. At this time, the first locking device 4 and the second locking device 10 can control the rotation of the ratchet 9 in one direction. The compressed spring coil is released, causing the winding drum 8 and the ratchet 9 to rotate. The winding drum 8 winds and collects the tape. When the tape is finished winding, because the first locking device 4 and the second locking device 10 are engaged in the ratchet groove of the ratchet 9, the winding drum 8 can be effectively prevented from springing back, thereby preventing the tape from springing back and causing injury to the surrounding workers. Safety and practicality are both effectively improved.

[0028] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. An automatic strap tightener comprising a base (1), characterised in that: The base (1) is rotatably connected to a winding drum (8) via a linkage shaft (18). A ratchet (9) is fixedly connected to each end of the winding drum (8). A rotating mounting hole (19) is provided on each of the symmetrical side surfaces of the base (1). A second locking device (10) is rotatably installed between the two rotating mounting holes (19). One side edge of the second locking device (10) is engaged in the ratchet groove of the ratchet (9). A second torsion spring (11) is sleeved on the outside of the rotating parts at both ends of the second locking device (10). The two compressible ends of the second torsion spring (11) abut against the outer surface of one side of the second locking device (10) and the inner wall of the base (1), respectively. A linkage protrusion (12) is provided at each of the symmetrical ends of one side edge of the second locking device (10).

2. The automatic telescopic belt tensioner according to claim 1, characterized in that: The base (1) has a movable arm (3) rotatably mounted on its inner side, and the movable arm (3) and the winding drum (8) share the same central axis. A first movable through groove (6) is provided on each of the symmetrical side surfaces of the movable arm (3). A first locking device (4) is slidably mounted between the two first movable through grooves (6). One end of the first locking device (4) is engaged in the ratchet groove of the ratchet (9).

3. The automatic telescopic belt tensioner according to claim 2, characterized in that: A connecting block (7) is provided on the inner side of the first movable through groove (6). A first torsion spring (5) is sleeved on the outside of the connecting block (7). One end of the first torsion spring (5) is snapped into the mounting hole on the outer surface of the first latch (4), and the other end of the first torsion spring (5) abuts against the inner side of the movable arm (3).

4. The automatic telescopic belt tensioner according to claim 1, characterized in that: A spring seat (13) is installed on one outer surface of the base (1). A spring coil is installed inside the spring seat (13). The linkage shaft (18) is engaged with the winding drum (8) and the linkage shaft (18) rotates synchronously with the winding drum (8). A slot is provided at one end of the linkage shaft (18), and one end of the spring coil is engaged in the slot.

5. An automatic telescopic belt tensioner according to claim 1, characterized in that: A second movable through groove (15) is provided on the symmetrical side surface of the base (1). A limiting piece (16) is slidably installed between the two second movable through grooves (15). A connecting strip is provided at the middle position of one side edge of the limiting piece (16). An inclined mounting piece (14) is integrally connected to the inner end face of the base (1). A through hole is provided on the outer surface of the mounting piece (14). The connecting strip passes through the through hole and a spring (17) is sleeved on the outside of the connecting strip. One end of the connecting strip is sleeved and fixedly connected to the limiting end block.

6. An automatic telescopic belt tensioner according to claim 1, characterized in that: The base (1) is fitted with a housing (2), and a strip through groove (20) is provided on the side surface of the housing (2).

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