A ratchet tensioning device to prevent jamming

Abstract

This invention relates to an anti-jamming ratchet-type tensioning device, comprising a base, a winding / unwinding mechanism with a ratchet, and an operating mechanism. The operating mechanism has an operating section, which includes a separately disposed locking member and a resilient check pawl. The resilient check pawl is elastically deflectable and mounted on the operating mechanism, normally positioned within the ratchet's rotation radius to prevent reverse rotation; the locking member is linearly movable and mounted on the operating mechanism to selectively restrict ratchet rotation.

Description

Technical Field

[0001] This invention relates to the field of tensioner technology, and in particular to an anti-jamming ratchet-type tensioning device. Background Technology

[0002] A tensioner is a tool used to secure goods during transportation, movement, loading, or storage. It primarily works by tightening steel formwork, compressed wooden boards, or other cargo. As an important mechanical component, tensioners are mainly used to adjust and secure ropes, rope nets, or straps. In cargo transportation and warehousing, tensioners ensure the stability and safety of goods during transport, preventing damage from shaking or collisions.

[0003] Existing German patents, including publication number DE102007020856A1, also disclose a tensioner. In this patent, the check pawl and locking pawl are typically separate components, and they need to interact to disengage. This results in inconsistent tensioner operation, a more complex tensioning structure, and higher manufacturing costs.

[0004] Therefore, it is necessary to propose a new type of tensioner that has a simple and compact structure, is easy to operate, and has low processing and manufacturing costs. Summary of the Invention

[0005] The present invention provides an anti-jamming ratchet tensioning device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides an anti-jamming ratchet-type tensioning device, comprising: a base; a winding and unwinding mechanism rotatably disposed on the base, the winding and unwinding mechanism including a ratchet with teeth; and an operating mechanism including an operating part operably connected to the ratchet, controlling the rotation and locking of the ratchet; the operating part includes:

[0007] A resilient check pawl is resiliently deflected on the operating mechanism, with at least a portion located within the rotation radius of the ratchet. The resilient check pawl is configured to: prevent the teeth from passing when the ratchet has a counterclockwise rotation tendency, thereby locking the ratchet; and allow the teeth to slide over when the ratchet rotates clockwise by pushing the resilient check pawl to resiliently deflect and reposition.

[0008] In summary, the present invention achieves the following technical effects: by setting the locking component and the elastic check pawl separately, when the gear teeth slide over the elastic check pawl, the latter can generate a small offset or give way due to the elasticity of the torsion spring. This reduces the friction and resistance between the elastic check pawl and the gear teeth, allowing the gear teeth to slide smoothly over the check pawl, avoiding rigid collisions and jamming, and significantly improving the smoothness and labor-saving effect of operation. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the present invention.

[0010] Figure 2 for Figure 1 A structural diagram from another perspective.

[0011] Figure 3 for Figure 2 A cross-sectional view of the structure in the horizontal direction.

[0012] Figure 4 for Figure 2 A schematic diagram of the longitudinal cross-section.

[0013] Figure 5 This is an exploded view of the present invention.

[0014] Figure 6 This is a schematic diagram of the operating mechanism of the present invention.

[0015] Figure 7 for Figure 6 A structural diagram from another perspective.

[0016] Figure 8 This is a schematic diagram of the lever component.

[0017] Figure 9 for Figure 8 A structural diagram from another perspective.

[0018] Figure 10 This is a diagram showing the engagement state of the ratchet and the elastic check pawl of the present invention.

[0019] Figure 11 for Figure 8 A schematic diagram of another embodiment.

[0020] Figure 12 for Figure 11 A structural diagram from another perspective.

[0021] Figure 13 for Figure 11 A schematic diagram of the structure after removing the pin.

[0022] Figure 14 for Figure 11The embodiment is shown in the structural diagram after installation on the base.

[0023] Figure 15 A schematic diagram of the operating mechanism in another embodiment of the present invention.

[0024] Figure 16 for Figure 15 A structural schematic diagram from another perspective in the illustrated embodiment.

[0025] Figure 17 for Figure 15 A schematic diagram of the structure at point | in the embodiment shown.

[0026] Figure 18 for Figure 15 A schematic diagram of the operating unit in the illustrated embodiment.

[0027] In the figure: base (100); storage area (101); side wall (102); locking position (1021); release position (1022); partition plate (1023); operating mechanism (200); connecting part (201); extension end (2011); slide groove (2012); movable groove (2013); boss (2014); handle (202); connecting plate (2021); center hole (2022); winding and unwinding mechanism (300); central shaft (301); drum (302); ratchet (303); gear tooth (3031); shaft Sleeve (304); lever (400); pressing end (401); pressing handle (4011); slide bar (4012); spring (4013); actuating end (402); locking element (403); positioning part (4031); elastic check pawl (404); arc-shaped part (4041); folding part (4042); torsion spring (405); pin (406); rotating part (407); slot (408); top end (4081); bottom end (4082); webbing (500); operating part (600); root (A). Detailed Implementation

[0028] like Figures 1 to 3As shown, the present invention provides a folding anti-jamming ratchet tensioning device, including a base 100, wherein the base 100 has a storage area 101 for storing webbing 500, the storage area 101 is provided with a winding mechanism 300, the winding mechanism 300 includes a ratchet 303 with teeth 3031, the storage area 101 is also provided with an operating mechanism 200, the operating mechanism 200 can selectively lock or unlock the winding mechanism 300, wherein a lever 400 is rotatably connected to the operating mechanism 200, the lever 400 has two opposite ends, which are respectively set as a pressing end 401 and an actuating end 402. The pressing end 401 and the actuating end 402 form a force-saving lever with the rotation point of the lever 400 as the fulcrum, that is, the distance from the pressing end 401 to the fulcrum is greater than the distance from the actuating end 402 to the fulcrum, so that the user can press easily during use.

[0029] Furthermore, the actuator 402 is provided with an elastic check pawl 404 located within the rotation radius of the ratchet 303 to prevent the ratchet 303 from rotating. When the pressing end 401 is pressed, the actuator 402 tilts up, and the elastic check pawl 404 tilts up along with the actuator 402. At this time, both the actuator 402 and the elastic check pawl 404 are located outside the rotation radius of the ratchet 303.

[0030] like Figure 3 and Figure 4 As shown, the winding and unwinding mechanism 300 also includes a central shaft 301 and a rotating drum 302 for winding the webbing 500. It is worth noting that the winding and unwinding mechanism 300 is equipped with a spiral spring (not shown in the figure) for automatic winding and unwinding. This is well-known technology in the art and will not be elaborated upon here. Further explanation is provided: the storage area 101 has sufficient space, and the central shaft 301 is positioned appropriately to ensure the winding and unwinding of the webbing 500.

[0031] The central shaft 301 is inserted into the storage area 101, the rotating drum 302 is sleeved on the outside of the central shaft 301 and rotatably connected to the central shaft 301, and the ratchet 303 is sleeved on the outside of the rotating drum 302 and fixedly connected to the rotating drum 302 to ensure that the ratchet 303 and the rotating drum 302 that winds the webbing 500 rotate synchronously; wherein, a bushing 304 is embedded between the central shaft 301 and the base 100, and at least a part of the bushing 304 is located in the storage area 101.

[0032] Among them, the bushing 304 and the components sleeved on the bushing 304 are stationary relative to the central axis 301. The part of the bushing 304 located outside the storage area 101 has a larger radius, thereby restricting the axial relative movement of the components on the bushing 304.

[0033] Furthermore, a bearing is provided between the bushings 304. The bearing can be a deep groove ball bearing or a cylindrical roller bearing, etc. Preferably, a deep groove ball bearing is used. The bearing and the components sleeved on the bearing can rotate relative to the central shaft 301.

[0034] like Figure 5 and Figure 6 As shown, the operating mechanism 200 includes a connecting part 201 and a handle 202. The connecting part 201 is sleeved on the outside of the bushing 304 and rotatably connected to the bushing 304. The connecting part 201 has an extension end 2011 away from the winding mechanism 300. The handle 202 is mounted on the extension end 2011, and the lever 400 is rotatably connected to the extension end 2011. The actuator 402 is positioned facing the winding mechanism 300, and the extension end 2011 has a pin 406 in the middle. The lever 400 is rotatably connected to the extension end 2011 via the pin 406, and a torsion spring 405 is mounted on the pin 406. Under normal conditions, the torsion spring 405 is in its natural state, thereby forcing the handle 202 to be in a position slightly higher than the extension end 2011, making it convenient for the user to press the handle 202. The torsion spring 405 also forces the actuator 402 to abut against the outer contour of the side wall 102. When the pressing end 401 is pressed, the torsion spring 405 is in working state, storing elastic potential energy and generating restoring torque, and has a tendency to return to its natural state. Once the pressing end 401 is no longer under force, the torsion spring 405 returns to its natural state.

[0035] Furthermore, the execution end 402 is also provided with a locking member 403, and the elastic check pawl 404 is fixedly installed on the locking member 403 and extends toward the ratchet 303. On the other hand, the storage area 101 has a side wall 102, and the outer contour of the side wall 102 is provided with a locking position 1021 and a release position 1022 that cooperate with the locking member 403. A partition 1023 is provided between the locking position 1021 and the release position 1022. The partition 1023 is a protrusion and is used to separate the locking position 1021 and the release position 1022.

[0036] There is a gap between the locking position 1021 and the releasing position 1022 and the winding mechanism 300. The gap between the releasing position 1022 and the winding mechanism 300 is greater than the gap between the locking position 1021 and the winding mechanism 300. In other words, the locking position 1021 is close to the winding mechanism 300 and is located within the rotation radius of the ratchet 303; while the releasing position 1022 is far away from the winding mechanism 300 and is located outside the rotation radius of the ratchet 303.

[0037] like Figure 7 and Figure 8As shown, the locking member 403 is provided with a positioning part 4031, which can be selectively placed on the locking position 1021 or the releasing position 1022. The positions of the locking member 403 and the elastic check pawl 404 are relatively fixed. Furthermore, the distance between the locking member 403 and the elastic check pawl 404 matches the distance between adjacent teeth 3031 on the ratchet 303.

[0038] When the locking part 4031 is placed in the locking position 1021, the elastic check pawl 404 abuts against the gear tooth 3031. When the positioning part 4031 is placed in the release position 1022, the elastic check pawl 404 abuts against the adjacent gear tooth 3031. In this way, regardless of whether the locking part 403 is placed in the locking position 1021 or the release position 1022, the elastic check pawl 404 abuts against the gear tooth 3031.

[0039] Furthermore, such as Figure 2 As shown, when the positioning part 4031 is in the locking position 1021, the locking member 403 is located within the rotation radius of the ratchet 303 and is engaged between two adjacent teeth 3031. Simultaneously, the torque of the ratchet 303 is transmitted to the locking member 403 through the teeth 3031, and then to the separator 1023 through the locking member 403, thereby engaging the teeth 3031 and restricting the ratchet 303 from rotating clockwise. At the same time, the elastic anti-return pawl 404 abuts against the teeth 3031, restricting the ratchet 303 from rotating counterclockwise, thus locking the winding and unwinding mechanism.

[0040] When the pressing end 401 is pressed, the locking member 403 is located outside the rotation radius of the ratchet 303. At the same time, the operating mechanism 200 is turned clockwise, causing the locking member 403 to rotate to the release position 1022, which is away from the winding and unwinding mechanism 300. At this time, the locking member 403 is outside the rotation radius of the ratchet 303, and the elastic check pawl 404 still abuts against the gear teeth 3031. The ratchet 303 can rotate clockwise but cannot rotate counterclockwise. When the pressing end 401 is pressed and the operating mechanism 200 is turned counterclockwise, both the locking member 403 and the elastic check pawl 404 are moved away from the ratchet 303. At this time, the ratchet 303 can rotate both clockwise and counterclockwise.

[0041] Specifically, such as Figures 7 to 10 As shown, the rotation radius of the ratchet 303 is defined as the area between the tip circle radius and the root circle radius of the ratchet 303 teeth. The elastic check pawl 404 has an arc-shaped portion 4041 and a folded portion 4042. The arc-shaped portion 4041 has a large radius of curvature, thus exhibiting significant elastic deformation. When the ratchet rotates clockwise, the arc-shaped portion 4041 deforms radially, increasing its radius of curvature, allowing the teeth 3031 to slide over and push aside the elastic check pawl 404.

[0042] The fold-back portion 4042 has a small radius of curvature, resulting in small elastic deformation and high rigidity. When rotating counterclockwise, the fold-back portion 4042 abuts against the gear teeth 3031. As the contact surface between the gear teeth 3031 and the fold-back portion 4042 gradually moves away from the tooth root, it compresses the fold-back portion 4042, causing a small elastic deformation. Simultaneously, the arc-shaped portion 4041 deforms radially inward. When the compression reaches a certain degree, the fold-back portion 4042 and the arc-shaped portion 4041 exhibit a large elastic restoring force, thereby resisting the gear teeth 3031 and preventing the ratchet 303 and the winding mechanism 300 from rotating. This ensures that, in the working state, the winding mechanism 300 can only rotate clockwise.

[0043] Furthermore, in actual use, pressing the pressing end 401 and rotating the operating mechanism 200 counterclockwise with the central axis 301 as the rotation center causes the locking member 403 to rotate to the leftmost end of the locking position 1021 and abut against the locking position 1021. At this time, the locking member 403 is simultaneously locked at the lowest point of the gear tooth 3031, and the elastic check pawl 404 is lifted up and no longer under force. Pressing the pressing end 401 and rotating the operating mechanism 200 clockwise with the central axis 301 as the rotation center, the elastic check pawl 404 can easily jump over the gear tooth 3031 and return to the starting position of the locking position 1021. Due to the action of the coil spring, the webbing 500 has a tendency to retract during this process, but the check device restricts the retraction of the webbing 500, and when the operating mechanism 200 is rotated clockwise, the webbing 500 can be tightened.

[0044] Press the pressing end 401 and further rotate the operating mechanism 200 counterclockwise, so that the locking member 403 is locked in the release position 1022. At the same time, the webbing 500 returns from the taut state to the slack state. Press the pressing end 401 again, so that the locking member 403 and the elastic check claw 404 are raised and located outside the rotation radius of the ratchet 303. Under the action of the coil spring, the webbing 500 is smoothly retracted. Since the present invention also has a safety device, the device will not be damaged due to excessive retraction speed.

[0045] To further explain the function of the elastic check pawl 404, when the locking member 403 is in the release position 1022, only the elastic check pawl 404 is within the rotation radius of the ratchet 303. When the webbing 500 is pulled outward, the gear teeth 3031 can easily break through the obstruction of the arc-shaped part 4041, allowing the webbing 500 to be pulled outward easily. When the webbing 500 is stopped from being pulled outward, the ratchet 303 will rotate counterclockwise under the action of the coil spring. At this time, the surface of the gear teeth 3031 contacts the fold-back part 4042 and squeezes the fold-back part 4042. Because the fold-back part 4042 generates elastic deformation and stores elastic potential energy, the restoring torque of the clockwise rotation of the fold-back part 4042 is finally balanced with the restoring torque of the counterclockwise rotation of the coil spring, and the gear teeth 3031 will not rotate.

[0046] In other possible embodiments of the resilient check claw 404, such as Figures 11 to 13 As shown, the elastic check pawl 404 can also be in the form of a straight plate. With the straight plate shape of the elastic check pawl 404, when the ratchet 303 rotates clockwise, the gear teeth 3031 can slide more smoothly over the elastic check pawl 404. However, since the straight plate shape of the elastic check pawl 404 has a smaller check force, the straight plate shape of the elastic check pawl 404 is more suitable for scenarios with smaller loads.

[0047] In other possible embodiments of the resilient check pawl 404 (not shown in the figure), the resilient check pawl 404 may also be the outer contour shape of the gear tooth 3031, in which case the resilient check pawl 404 is parallel to the gear tooth 3031. Specifically, the straight portion parallel to the straight part of the tooth 3031 is spaced relatively close to the tooth 3031, while the concave portion parallel to the curved part of the tooth 3031 is spaced even closer to the tooth 3031. When the ratchet 303 rotates counterclockwise, the elastic check pawl 404 undergoes elastic deformation. Since the contours are roughly the same, the contact area between the elastic check pawl 404 and the tooth 3031 is larger, enabling it to withstand greater rotational torque. Because the elastic check pawl 404 is less prone to deformation, the ratchet 303 has a more significant anti-return effect when the winding mechanism 300 is not pulled by an external force. When the webbing 500 is pulled by an external force, the ratchet 303 tends to rotate clockwise, making it easier to isolate the elastic check pawl 404 from the tooth 3031, thereby easily disrupting the rotational torque of the elastic check pawl 404. As a result, the tooth 3031 can pass smoothly through the elastic check pawl 404, causing the winding mechanism 300 to rotate clockwise.

[0048] Please see Figures 11 to 14 The present invention also provides an anti-jamming ratchet tensioning device, including a base 100, a winding mechanism 300 provided on the base 100, the winding mechanism 300 including a ratchet 303 with teeth 3031, the base 100 also provided an operating mechanism 200, the operating mechanism 200 can selectively lock or unlock the winding mechanism 300, a lever 400 rotatably connected to the operating mechanism 200, the lever 400 having two opposite ends, which are respectively set as a pressing end 401 and an actuating end 402, the actuating end 402 is provided with an elastic anti-return pawl 404 located within the rotation radius of the ratchet 303, for preventing the ratchet 303 from rotating back.

[0049] In this embodiment, the operating mechanism 200 is provided with a support member, and the lever member 400 has an active area. The support member extends into the active area. The accommodating area of ​​the active area is larger than that of the support member, and the support member is allowed to move within the active area. The pressing end 401 and the actuating end 402 form a lever with the support member as the fulcrum. When the pressing end 401 is pressed, the actuating end 402 is raised. The elastic check pawl 404 is located outside the rotation radius of the ratchet 303.

[0050] The support member can support the lever member 400. When the pressing end 401 is pressed, the lever member 400 can rotate around the support member as a fulcrum, thereby lifting the actuating end 402, which in turn causes the elastic check claw 404 to lift.

[0051] By positioning the support member within the movable area, relative movement can occur between the support member and the lever member 400. Therefore, when the elastic check pawl 404 abuts against the ratchet 303 to prevent backflow, if the ratchet 303 rotates clockwise, the rotating teeth 3031 can push the elastic check pawl 404 away. This reduces the friction and resistance between the elastic check pawl 404 and the teeth 3031, allowing the teeth 3031 to glide more smoothly over the elastic check pawl 404 and preventing jamming. This results in smoother and less effort when pulling the webbing 500 out of the winding mechanism 300.

[0052] In one embodiment, the support member is a pin 406, which passes through the extension end 2011 and is located between the winding mechanism 300 and the handle 202. The lever member 400 is provided with a rotating portion 407, located between the pressing end 401 and the actuating end 402; a movable area is formed on the rotating portion 407. The movable area is a slot 408, which has a top end 4081 and a bottom end 4082; the pin 406 can move between the top end 4081 and the bottom end 4082. When the pin 406 approaches the bottom end 4082, the resilient check pawl 404 moves away from the gear tooth 3031. A torsion spring 405 is also sleeved on the outside of the pin 406, and the torsion spring 405 extends upward toward the actuating end 402.

[0053] In the above embodiment, the pin 406 can move back and forth between the top end 4081 and the bottom end 4082. The elastic check pawl 404 is a straight plate and is integrally formed with the locking member 403. The lever member 400 can rotate outside the pin 406. Thus, pressing the pressing end 401 can lift the actuating end 402, along with the locking member 403 and the elastic check pawl 404. By providing a torsion spring 405, when the external force pressing on the pressing end 401 is removed, the torsion spring 405 can use its elastic force to push the lever member 400 to rotate and reset.

[0054] In the above embodiment, when the elastic check pawl 404 abuts against the ratchet 303 to prevent backflow, if the ratchet 303 rotates clockwise, and since the pin 406 can move back and forth between the top end 4081 and the bottom end 4082, the rotating gear teeth 3031 can push the elastic check pawl 404 away. The lever 400 will then move upward due to the pushing force, and the pin 406 will move towards the bottom end 4082 of the slot 408. After the gear teeth 3031 slide past the elastic check pawl 404, the torsion spring 405 will then use its rebound force to push the lever 400 downward to reset, and the pin 406 will return to the top end 4081. Therefore, in this way, when the ratchet 303 rotates continuously clockwise, the lever 400 bounces up and down with the rotation of the ratchet 303. This reduces the friction and resistance between the elastic check pawl 404 and the gear tooth 3031, allowing the gear tooth 3031 to slide more smoothly over the elastic check pawl 404 and avoid jamming. As a result, pulling the webbing 500 out of the winding mechanism 300 is smoother and less strenuous.

[0055] In other embodiments of the support (not shown in the figures), the support may also be a cylindrical boss, which is inserted into and movable within the slot 408. The lever 400 can rotate along the boss. Of course, the support is not limited to the form of a pin 406 or a boss; it may also be a pin, a sliding key, or any other form suitable for supporting the rotation and movement of the lever 400.

[0056] Of course, the active area is not limited to the form of a through groove. In other embodiments of the active area (not shown in the figure), the active area can also be provided with grooves corresponding to the form of different support members, and the shape is provided according to the outer contour of the support member.

[0057] For example, when the support is a cylindrical boss, the movable area can be set as a strip-shaped groove, allowing the boss to rotate and move within the groove. When the support is a slide key, the movable area can correspond to a keyway, and when the support is a slide key, the slide can be rotatably connected to the operating mechanism 200, thereby ensuring that the lever 400 can rotate with the slide key.

[0058] Please see Figure 3 and Figure 5 The present invention also provides an anti-jamming ratchet tensioning device, including a base 100, wherein the base 100 has a storage area 101 for storing webbing 500, the storage area 101 is provided with a winding mechanism 300, the winding mechanism 300 includes a ratchet 303 with teeth 3031.

[0059] like Figure 3 and Figure 5As shown, the storage area 101 is also equipped with an operating mechanism 200, which allows for selective locking or unlocking of the roll-up mechanism 300, such as... Figure 15 and Figure 18 As shown, the operating mechanism 200 is provided with an operating part 400, which includes a pressing end 401 and an actuating end 402.

[0060] like Figure 15 and Figure 18 As shown, the actuator 402 includes an elastic check pawl 404 disposed within the rotation radius of the ratchet 303 to prevent the ratchet 303 from rotating back. The elastic check pawl 404 is separately disposed from the pressing end 401 and is rotatably connected to the operating mechanism 200. The elastic check pawl 404 is in contact with the teeth 3031 on the ratchet 303. A torsion spring 405 is disposed on the elastic check pawl 404. The end of the torsion spring 405 away from the elastic check pawl 404 is connected to the operating mechanism 200. The torsion spring 405 provides a continuous return force to the elastic check pawl 404, so that it always has a tendency to deflect toward the ratchet teeth 3031. When the ratchet 303 rotates clockwise, the teeth 3031 push the elastic check pawl 404 to elastically deflect and avoid it. After the teeth 3031 pass, the torsion spring 405 immediately drives the elastic check pawl 404 to reset to the engaged position, realizing the anti-reverse function. This design ensures the reliability of the unidirectional rotation of the ratchet 303, while significantly reducing the risk of rotation jamming through elastic clearance.

[0061] Furthermore, such as Figure 15 , Figure 16 and Figure 18 As shown, the execution end 402 also includes a locking member 403, which is disposed on the pressing end 401 and is slidably connected to the operating mechanism 200. The locking member 403 is provided with a positioning part 4031, which can be selectively placed on the locking position 1021 or the releasing position 1022. The locking member 403 and the elastic check claw 404 are separately disposed so that the two exist independently and do not affect each other.

[0062] like Figure 5 As shown, the storage area 101 has a side wall 102. The outer contour of the side wall 102 is provided with a locking position 1021 and a releasing position 1022 that cooperate with the locking member 403. A partition 1023 is provided between the locking position 1021 and the releasing position 1022. The partition 1023 is a protrusion and is used to separate the locking position 1021 and the releasing position 1022.

[0063] When the pressing end 401 is pressed, the locking member 403 is located outside the rotation radius of the ratchet 303. At the same time, the operating mechanism 200 is turned clockwise, causing the locking member 403 and the elastic check pawl 404 to rotate to the release position 1022, which is away from the winding and unwinding mechanism 300. At this time, the locking element 403 is outside the rotation radius of the ratchet 303, and the elastic check pawl 404 is still in contact with the tooth 3031. The ratchet 303 can rotate clockwise but cannot rotate counterclockwise. In this state, the operator can pull the webbing 500 by rotating the ratchet 303 clockwise. Since the locking element 403 and the elastic check pawl 404 are set separately, when the tooth 3031 slides over the elastic check pawl 404, the latter can make a small displacement or clearance movement by means of the elasticity of the torsion spring 405. This can reduce the friction and resistance between the elastic check pawl 404 and the tooth 3031, so that the tooth 3031 can slide smoothly over the check pawl 404, avoiding rigid collision and jamming, and significantly improving the smoothness and labor-saving effect of operation.

[0064] like Figure 15 , Figure 16 and Figure 17 As shown, the operating mechanism 200 includes a connecting part 201 and a handle 202. The pressing end 401 is disposed on the handle 202. The connecting part 201 has an extension end 2011 that is away from the winding and unwinding mechanism 300. The handle 202 is mounted on the extension end 2011. Both sides of the extension end 2011 are provided with a sliding groove 2012 and a movable groove 2013. The movable groove 2013 is located behind the sliding groove 2012. A boss 2014 is provided on the inner wall of the movable groove 2013. The positioning part 4031 of the locking member 403 is slidably disposed inside the sliding groove 2012. When the pressing end 401 is pressed, the positioning part 4031 can slide laterally within the slide groove 2012 (usually perpendicular to the axis of the ratchet 303). This sliding action drives the locking part 403 to move as a whole, selectively entering or disengaging from the rotation radius of the ratchet 303, thereby locking or unlocking the ratchet 303. The elastic check pawl 404 has a root, which is rotatably disposed within the movable groove 2013 and abuts against the boss 2014. When the ratchet 303 rotates clockwise, the tooth 3031 slides over the working inclined surface of the elastic check pawl 404, applying a radial thrust to it. Under this thrust, the elastic check pawl 404 elastically deflects around the fulcrum of the boss 2014. The movable groove 2013 provides the necessary space for this rotation. After the tooth 3031 passes through, under the action of the torsion spring 405, the elastic check pawl 404 automatically returns to the ready position to contact the subsequent tooth 3031.

[0065] like Figure 16 and Figure 18As shown, the pressing end 401 includes a pressing handle 4011, a locking member 403 is fixedly disposed at the bottom of the pressing handle 4011, a slide rod 4012 is fixedly installed on the side of the pressing handle 4011 away from the winding mechanism 300, a connecting plate 2021 is fixedly installed on the end of the handle 202 facing the slide rod 4012, a central hole 2022 is provided at the center of the connecting plate 201, the slide rod 4012 is slidably inserted into the central hole 2022, and a spring is fixedly installed between the pressing handle 4011 and the opposite surface of the connecting plate 2021. Spring 4013; When the operator presses the pressing handle 4011, the slide bar 4012 slides axially along the center hole 2022, causing the pressing handle 4011 to compress the spring 4013, which simultaneously drives the locking element 403 to vertically exit the ratchet rotation radius, releasing the mechanical interference to the ratchet 303. When the operator releases the pressing handle 4011, the spring 4013 releases its stored energy, pushing the pressing handle 4011 to precisely reset along the guide of the slide bar 4012, causing the locking element 403 to re-enter the ratchet rotation radius range, restoring the locking function.

[0066] In summary, the present invention achieves the following technical effects:

[0067] By placing both the elastic check pawl 404 and the locking element 403 on the actuating end 402 of the lever 400, pressing the lever 400 simultaneously controls both the elastic check pawl 404 and the locking element 403, thereby achieving functions such as locking, unlocking, or preventing backflow. This makes the tensioner structure simpler and more compact, easier and more convenient to operate, and effectively reduces manufacturing costs.

[0068] By providing a movable area on the lever 400, when the elastic check pawl 404 abuts against the ratchet 303 to prevent backflow, and the ratchet 303 rotates clockwise, the lever 400 will bounce up and down with the rotation of the ratchet 303. This reduces the friction and resistance between the elastic check pawl 404 and the gear teeth 3031, allowing the gear teeth 3031 to slide more smoothly over the elastic check pawl 404 and preventing jamming. This makes pulling the webbing 500 out of the winding mechanism 300 smoother and less strenuous.

[0069] By setting the locking element 403 and the elastic check pawl 404 separately, when the gear tooth 3031 slides over the elastic check pawl 404, the latter can make a small offset or give way due to the elasticity of the torsion spring 405. This reduces the friction and resistance between the elastic check pawl 404 and the gear tooth 3031, allowing the gear tooth 3031 to slide smoothly over the check pawl 404, avoiding rigid collisions and jamming, and significantly improving the smoothness and labor-saving effect of operation.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A ratchet-type tensioning device for preventing jamming, characterized in that, include: Base; and A winding mechanism is rotatably mounted on a base, and the winding mechanism includes a ratchet with teeth; and An operating mechanism, including an operating part, operablely connected to a ratchet, controls the rotation and locking of the ratchet; and The operating unit includes: A resilient check pawl is flexibly deflected on the operating mechanism, with at least a portion located within the rotation radius of the ratchet; and The resilient check claw is configured such that: When the ratchet has a counterclockwise rotation tendency, it prevents the teeth from passing through, thereby locking the ratchet; and When the ratchet rotates clockwise, the teeth can push the elastic check pawl to elastically deflect and displace, allowing the teeth to slide over.

2. The anti-jamming ratchet tensioning device according to claim 1, characterized in that, The operating mechanism includes a connecting part and a handle, and the connecting part is rotatably connected to the winding and unwinding mechanism.

3. The anti-jamming ratchet tensioning device according to claim 2, characterized in that, The connecting part has an extension end away from the winding mechanism. The handle is installed on the extension end. Both sides of the extension end are provided with a sliding groove and a movable groove. The movable groove is located behind the sliding groove, and a boss is provided on the inner wall of the movable groove.

4. The anti-jamming ratchet tensioning device according to claim 3, characterized in that, The operating unit also includes a locking component, which has a positioning part that is slidably disposed inside a slide groove; and When the locking element is pressed, the positioning part can slide laterally within the groove. This sliding action causes the locking element to move as a whole, selectively entering or leaving the turning radius of the ratchet, thereby locking or unlocking the ratchet.

5. The anti-jamming ratchet tensioning device according to claim 3, characterized in that, The resilient check pawl has a root, which is rotatably disposed within a movable groove and abuts against a boss; and When the gear teeth exert force on the elastic check pawl, the elastic check pawl elastically deflects around the fulcrum of the boss in the movable groove, allowing the elastic check pawl to make a small displacement or repositioning movement.

6. The anti-jamming ratchet tensioning device according to claim 1, characterized in that, The elastic check pawl is equipped with a torsion spring. The end of the torsion spring away from the elastic check pawl is connected to the operating mechanism. The torsion spring provides a continuous return force to the elastic check pawl, so that it always tends to deflect toward the ratchet teeth.

7. The anti-jamming ratchet tensioning device according to claim 4, characterized in that, The operating unit also includes a pressing end, which includes a pressing handle. A locking element is fixedly installed at the bottom of the pressing handle, and a slide bar is fixedly installed on the side of the pressing handle away from the winding mechanism.

8. The anti-jamming ratchet tensioning device according to claim 7, characterized in that, A connecting plate is fixedly installed on the end of the handle facing the slide bar. A central hole is opened in the center of the connecting plate. The slide bar is slidably inserted into the central hole. A spring is fixedly installed between the pressing handle and the surface of the connecting plate on the opposite side.

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