A tensioner

Abstract

The utility model relates to a kind of tensioners, including seat body, center shaft, pulling member, ratchet, bandage assembly and anti-loosening device.Bandage assembly at least one part is around the center shaft, pulling member is driven center shaft by ratchet and tight bandage;Anti-loosening device is located on the bandage assembly extension path, can be clamped bandage and limit loosening in locked state, in the release state, remove restriction, to improve the stability of tension and use safety.

Description

Technical Field

[0001] This utility model relates to the field of binding tools, specifically to a tensioner. Background Technology

[0002] Tensioners are commonly used in vehicle transportation, cargo bundling, and outdoor securing. They connect to external anchoring points via a strap assembly and use a ratchet, pawl, and lever mechanism to gradually tighten the strap, keeping the cargo or object to be secured in a stable position. Existing tensioners typically rely on the meshing relationship between the ratchet and pawl to limit the reverse rotation of the central axis, thereby maintaining the strap's tension.

[0003] However, under vehicle movement, cargo vibration, or external impact, the straps will be subjected to continuous or intermittent reverse tension. Due to the assembly gap between the ratchet and pawl, and the inherent flexibility and elastic deformation of the straps themselves, the tensioner is prone to slight strap backing, decreased tension, or gradual loosening after prolonged use. Especially when cargo shakes, the straps are repeatedly stretched and rebounded. Relying solely on the ratchet and pawl structure for locking is insufficient to directly clamp and restrict the extended portion of the straps, leading to a risk of straps loosening.

[0004] In addition, some tensioners are equipped with an automatic retraction mechanism to improve ease of use, allowing the strap to automatically retract after being released. However, in tensioners with automatic retraction, if there is a lack of auxiliary limiting structure for the strap's extension path, the strap may still slip locally due to vibration, rebound, or changes in force when tensioned; during release or adjustment, the strap may also move uncontrollably, affecting safety and reliability. Utility Model Content

[0005] This invention provides a tensioner to solve the problems mentioned in the background art.

[0006] To achieve the above-mentioned objectives, this utility model adopts the following technical solution:

[0007] A tensioner includes a base; a central shaft rotatably disposed on the base; an actuating member disposed on the central shaft for driving a tightening operation; a ratchet disposed on the central shaft and cooperating with the actuating member to drive the central shaft to rotate in a tightening direction when the actuating member is driven; a strap assembly, at least a portion of which is wound around the central shaft; and an anti-loosening device disposed on the extension path of the strap assembly, including a clamping portion and a locking member movable relative to the clamping portion.

[0008] The anti-loosening device has a locked state and a released state. In the locked state, the clamping member approaches the clamping part and abuts against the strap assembly to restrict the strap assembly from moving in the loosening direction. In the released state, the clamping member moves away from the clamping part to release the restriction on the strap assembly, allowing the strap assembly to move relative to the seat.

[0009] Furthermore, the anti-loosening device also includes a base and a driving member. The clamping part is disposed on the base, the locking member is movably mounted on the base, and the driving member is movably disposed on the base body for driving the locking member to move relative to the clamping part.

[0010] Furthermore, the anti-loosening device also includes a rotating shaft and an elastic element. The clamping element is rotatably mounted on the base via the rotating shaft, and the elastic element is disposed between the base and the clamping element, applying an elastic force to the clamping element to bring it closer to the clamping portion.

[0011] Furthermore, the actuating member is provided with a variable diameter abutting arc surface, one end of the driving member abuts against the variable diameter abutting arc surface, and the other end cooperates with the clamping member.

[0012] Furthermore, the base includes a mounting plate and two side plates, the two side plates being formed by extending from both sides of the mounting plate, and the two ends of the rotating shaft being respectively connected to the two side plates.

[0013] Furthermore, the base also includes an upper connecting plate connected between the two side plates, the upper connecting plate having a drive hole, the drive component including a connecting rod, the connecting rod passing through the drive hole and engaging with the clamping component.

[0014] Furthermore, a drive groove is provided on the base, and the drive component is slidably inserted into the drive groove.

[0015] Furthermore, a spring is sleeved on the connecting rod, and the spring is located between the driving member and the upper connecting plate.

[0016] Furthermore, the clamping part includes an inclined plate that is inclinedly disposed on the base, the inclined plate is provided with a first inclined tooth, and the clamping member is provided with a second inclined tooth that is opposite to the first inclined tooth, and an inclined clamping opening is formed between the first inclined tooth and the second inclined tooth.

[0017] Furthermore, the lever has a locked position and an automatic retracted position; when the lever is in the locked position, the area on the variable diameter abutment surface that is closer to the central axis corresponds to the driving member, so that the driving member does not push the clamping member away from the clamping part; when the lever is in the automatic retracted position, the area on the variable diameter abutment surface that is closer to the central axis corresponds to the driving member, so that the driving member pushes the clamping member away from the clamping part.

[0018] The advantages of this utility model over the prior art are as follows:

[0019] This invention incorporates an anti-loosening device along the extension path of the strap assembly, allowing the locking element to approach and abut against the strap assembly in a locked state, thereby directly clamping and restricting the extension section of the strap assembly. Compared to structures relying solely on ratchet and pawl for locking, this invention reduces the likelihood of slight pullback, tension reduction, or gradual loosening of the strap under vibration, impact, or reverse tension, thus improving the reliability of cargo bundling and securing.

[0020] Meanwhile, the anti-loosening device can move the clamping part away from the holding part when the strap is loosened, releasing the clamping restriction on the strap assembly and allowing the strap assembly to move relative to the base, making it convenient for the user to pull out, adjust, or retract the strap. Therefore, this invention can achieve anti-loosening locking when tightened without affecting the normal movement of the strap during release or retraction, improving the ease of operation of the tensioner.

[0021] Furthermore, through the cooperation of the variable-diameter abutment arc surface, the driving component, and the clamping component, the anti-loosening device can switch between a locked and unlocked state according to the position of the lever. When the lever is in the locked position, the clamping component maintains the clamping state of the strap; when the lever is in the automatic retraction position, the driving component pushes the clamping component to open, allowing the strap to retract smoothly and automatically. Thus, the anti-loosening function and the automatic strap retraction function can work together to avoid the anti-loosening structure hindering the strap retraction, improving the safety of the tensioner and the user experience. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0023] Figure 1 This is a perspective view of an embodiment of the present invention.

[0024] Figure 2 for Figure 1 An exploded view of an embodiment.

[0025] Figure 3 for Figure 1 A schematic diagram of the connection of the first strap in the illustrated embodiment.

[0026] Figure 4 for Figure 3 A three-dimensional schematic diagram of the base of the embodiment shown.

[0027] Figure 5 for Figure 1 An exploded view of the lever element in the illustrated embodiment.

[0028] Figure 6 for Figure 1 A schematic diagram of the lever and ratchet in the embodiment shown.

[0029] Figure 7 for Figure 1 A cross-sectional schematic diagram of the anti-loosening device in the loosened state according to the embodiment shown.

[0030] Figure 8 for Figure 7 The illustrated embodiment is a cross-sectional view along the length of the central axis.

[0031] Figure 9 for Figure 8 The diagram shows the installation of the damping and central shaft in the embodiment shown.

[0032] Figure 10 for Figure 7 A schematic diagram of the installation of the anti-loosening device in the embodiment shown.

[0033] Figure 11 for Figure 10 A perspective view of the anti-loosening device in the embodiment shown.

[0034] Figure 12 for Figure 11 A cross-sectional schematic diagram of the anti-loosening device in the embodiment shown.

[0035] Figure 13 for Figure 1 The illustrated embodiment is a three-dimensional schematic diagram of the locked state.

[0036] Figure 14 for Figure 13 A cross-sectional schematic diagram of the anti-loosening device in the locked state according to the embodiment shown.

[0037] Figure 15 for Figure 11 An explosion diagram of the anti-loosening device in the illustrated embodiment.

[0038] Reference numerals: tensioner (10); seat (100); base plate (101); flange plate (102); fixing part (103); bottom receiving section (104); side fixing piece (105); fixing hole (106); fixing shaft (107); locking groove (108); protrusion (109); unlocking groove (110); drive groove (111); lever (200); connecting part (210); handle part (220); opening (221); handle shaft (222); locking part (223); button (224); locking plate (225); safety plate (226); variable diameter abutment arc surface (230); ratchet (300); ratchet tooth (301); strap assembly (400); first strap (410); first hook (411); second strap (420); second hook (421); Central shaft (500); First end (501); Second end (502); Slot (503); Spring assembly (510); Spring (511); Spring housing (512); Damping assembly (520); Damping (521); Damping housing (522); Block (523); Anti-loosening device (600); Base (610); Mounting plate (611); Side plate (612); Upper connecting plate (613); Inclined plate (614); First helical tooth (615); Rotating shaft (616); Torsion spring (617); Clamping element (620); Through hole (621); Extension (622); Second helical tooth (623); Inclined clamping port (624); Driving element (630); Abutment end (631); Connecting rod (632); Driving hole (633); Spring (634). Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. The following description of at least one exemplary embodiment is illustrative in nature and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary rather than limiting. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0042] like Figure 1 , Figure 2 and Figure 3 As shown, a tensioner 10 is provided, including a base 100, an actuating element 200, a ratchet 300, and a strap assembly 400. The strap assembly 400 includes a first strap 410 and a second strap 420. In a preferred embodiment of this utility model, the base 100 is preferably a U-shaped structure, including a base plate 101 and two flange plates 102 formed by the opposite two edges of the base plate 101 extending in the same direction. The two flange plates 102 are spaced apart from each other and together with the base plate 101 define an installation space. The base plate 101 is used to connect the two flange plates 102, so that the two flange plates 102 maintain a predetermined distance; the two flange plates 102 are used to provide relatively arranged support positions for functional components to be assembled later, so that relevant components can be arranged between the two flange plates 102, thereby improving the structural concentration and assembly stability of the base 100.

[0043] See Figure 4 The base plate 101 and the two flange plates 102 are preferably integrally formed, using sheet metal stamping and bending. The connection area between the base plate 101 and the flange plates 102 is preferably a rounded transition structure to reduce stress concentration in the connection area and improve the durability of the seat 100 under repeated stress.

[0044] In a preferred embodiment of this utility model, a fixing portion 103 is integrally formed at one end of the base 100. The fixing portion 103 is located in the end region jointly formed by the base plate 101 and the two flange plates 102, and is continuously connected to both the base plate 101 and the two flange plates 102. Specifically, the base plate 101 extends further at this end of the base 100 to form the connection base of the fixing portion 103, and the two flange plates 102 extend further along both sides of the base plate 101 at the same end. The fixing portion 103 includes a bottom receiving section 104 continuous with the base plate 101, and two lateral fixing pieces 105 extending further from the ends of the two flange plates 102. The bottom receiving section 104 is located between the two lateral fixing pieces 105 and is continuous with the base plate 101; the two lateral fixing pieces 105 are located on opposite sides of the bottom receiving section 104 and are continuous with their respective flange plates 102.

[0045] Two lateral fixing plates 105 are respectively provided with fixing holes 106. The two fixing holes 106 are arranged opposite to each other and pass through the corresponding lateral fixing plates 105 along the interval direction of the two flange plates 102. A fixing shaft 107 is inserted into the fixing hole 106. The two ends of the fixing shaft 107 are supported by the two lateral fixing plates 105 respectively, so that the fixing shaft 107 can be stably installed on the base 100.

[0046] See Figure 3 A first strap 410 is connected to the fixed shaft 107. One end of the first strap 410 is fixedly mounted on the fixed shaft 107, and the other end is provided with a first hook 411. Preferably, the first strap 410 is fixed to the fixed shaft 107 by sewing, so that a stable connection is formed between the first strap 410 and the fixed shaft 107. The first hook 411 is used to cooperate with the connection structure on the external fixing point, the vehicle connection position, or the object to be bound, so that the first strap 410 can be used as one end connector of the tensioning device. Through this structure, the tension on the first strap 410 can be transmitted to the seat 100 through the fixed shaft 107, improving the stress stability of the connection position of the first strap 410.

[0047] A central shaft 500 is located at the center of the flange plate 102. A ratchet 300 is fixedly sleeved onto the central shaft 500. The ratchet 300 is located in the mounting space between the two flange plates 102 and is coaxially arranged with the central shaft 500. Multiple ratchet teeth 301 are formed on the outer periphery of the ratchet 300, and these teeth are continuously distributed along the circumference of the ratchet 300. The ratchet 300 is fixedly connected to the central shaft 500, so that when the ratchet 300 is subjected to force and rotates, it can synchronously drive the central shaft 500 to rotate, thereby transmitting the intermittent rotational force applied to the ratchet 300 to the central shaft 500. Because the ratchet 300 is housed within the mounting space, the two flange plates 102 can provide protection and positional restraint for the ratchet 300 from both sides, reducing the risk of the ratchet 300 being exposed and collided or shifting during use.

[0048] See Figure 1 and Figure 2 A second strap 420 is also wound around the central shaft 500, and the second strap 420 is located in the mounting space between the two flange plates 102. One end of the second strap 420 is fixedly connected to the central shaft 500, and the other end extends out of the mounting space and is provided with a second hook 421. The second strap 420 is wound around the outer periphery of the central shaft 500 near the central shaft 500, so that when the central shaft 500 rotates, it can drive the second strap 420 to gradually wind around the central shaft 500, thereby changing the length of the second strap 420 extending out of the seat body 100. The second hook 421 is used to cooperate with the external fixing point, vehicle connection position, or connection structure on the object to be tied, so that the second strap 420 can be used as the other end connector of the tensioning device. Since the second strap 420 is directly wound around the central shaft 500, and the ratchet 300 is fixedly connected to the central shaft 500, when the ratchet 300 drives the central shaft 500 to rotate in the tightening direction, the second strap 420 can gradually rewind as the central shaft 500 rotates, thus achieving the tightening operation.

[0049] A lever 200 is also provided on the central shaft 500. The lever 200 is coaxially arranged with the ratchet 300 and can swing relative to the seat 100 about the central shaft 500. The lever 200 includes a connecting part 210 and a handle part 220 connected to the connecting part 210. The connecting part 210 is sleeved on the central shaft 500 and is at least partially located in the mounting space between the two flange plates 102. The connecting part 210 is adjacent to the winding position of the ratchet 300 and the second strap 420, so that the lever 200 can be stably rotated and mounted on the central shaft 500 and kept compactly arranged with the ratchet 300 and the second strap 420 in the mounting space. The handle part 220 extends from the connecting part 210 outward from the mounting space and forms an operating structure for the user to grip and apply force. When the user grips the handle 220 and applies force, the handle 220 drives the connecting part 210 to swing around the central axis 500, thereby enabling the lever 200 to be operated relative to the base 100. By arranging the connecting part 210 within the installation space and extending the handle 220 outside the installation space, a tight structural fit between the lever 200 and the central axis 500, the ratchet 300, and the second strap 420 is ensured, while also facilitating operation by the user from outside the base 100, thus improving the ease of operation of the tensioner 10.

[0050] The flange plate 102 has an outer edge formed on the side away from the base plate 101. The outer edge is positioned around the area where the central axis 500 is located and forms an arcuate profile that adapts to the movement path of the lever 200. A locking groove 108, a protrusion 109, and an unlocking groove 110 are formed on the outer edge of the flange plate 102. The locking groove 108 extends along the arcuate profile of the outer edge, the unlocking groove 110 is located at the end of the locking groove 108 near the handle portion 220, and the protrusion 109 is located between the locking groove 108 and the unlocking groove 110. The locking groove 108, the protrusion 109, and the unlocking groove 110 are all integrally formed on the flange plate 102 to define different positions of the lever 200 relative to the base 100.

[0051] An opening 221 is provided on the handle portion 220, penetrating a portion of the wall surface of the handle portion 220. A handle shaft 222 is provided on the handle portion 220 between the opening 221 and the connecting portion 210, and the handle shaft 222 extends laterally through the handle portion 220. A locking member 223 is rotatably mounted on the handle shaft 222, allowing the locking member 223 to swing relative to the handle portion 220. By providing the locking member 223 on the handle portion 220, the user can directly operate the locking member 223 when holding the handle portion 220, thereby making the tightening, locking, and releasing actions of the second strap 420 more focused and the operation more convenient.

[0052] See Figure 5 and Figure 6The locking element 223 includes a button 224, a locking plate 225, and a safety plate 226. The button 224 is at least partially disposed at the opening 221 of the handle portion 220 and protrudes from the handle portion 220 through the opening 221 to form an operating position for the user to press. The locking plate 225 is connected to the button 224 and can swing relative to the handle portion 220 around the handle shaft 222 with the button 224. The safety plate 226 is disposed on one side of the locking plate 225 and can swing together with the button 224 and the locking plate 225 around the handle shaft 222. Both the locking plate 225 and the safety plate 226 extend toward the ratchet 300 and can engage with the ratchet teeth 301 on the outer periphery of the ratchet 300; the safety plate 226 also extends toward the flange plate 102 and can engage with the locking groove 108, the protrusion 109, and the unlocking groove 110 on the flange plate 102. Thus, the locking plate 225 and the safety plate 226 are used together to cooperate with the ratchet 300 to improve the driving and limiting stability of the ratchet 300; the safety plate 226 is also used to cooperate with the flange plate 102 to limit the position of the locking member 223 relative to the seat 100.

[0053] When the tensioner 10 is in the normal tensioned state, both the locking plate 225 and the safety plate 226 engage with the ratchet 301 of the ratchet 300, and the safety plate 226 is simultaneously located within the locking groove 108 of the flange plate 102. When the user pulls the handle 220, the handle 220 drives the locking member 223 to swing around the central axis 500 together with the pulling member 200. The locking plate 225 and the safety plate 226 together push against the ratchet 301 of the ratchet 300, causing the ratchet 300 to drive the central axis 500 to rotate, thereby gradually tightening the second strap 420 wrapped around the central axis 500. During this process, the safety plate 226 moves along the locking groove 108, which guides and limits the safety plate 226, keeping its position stable. Since the safety plate 226 and the locking plate 225 both belong to the locking element 223 and are linked around the same handle shaft 222, the position of the locking plate 225 is also stably limited after the position of the safety plate 226 is restricted by the locking groove 108, thus ensuring that both the locking plate 225 and the safety plate 226 can be reliably engaged with the ratchet 300.

[0054] The protrusion 109 is located between the locking groove 108 and the unlocking groove 110, serving to block the safety plate 226. When the button 224 is not pressed, the safety plate 226 is restricted by the protrusion 109, making it difficult for it to directly enter the unlocking groove 110 from the locking groove 108. Therefore, the locking member 223 is less likely to accidentally switch to the unlocked state. Since the position of the safety plate 226 is restricted by both the protrusion 109 and the locking groove 108, the locking plate 225 is also less likely to swing abnormally with the locking member 223. This maintains the engagement between the locking plate 225 and the ratchet teeth 301 of the ratchet 300, reducing the risk of the second strap 420 being accidentally released in the event of vibration, impact, or accidental contact.

[0055] When it is necessary to release the tension or switch the tensioner 10 state, the user presses the button 224 exposed at the opening 221. The button 224 causes the locking plate 225 and the safety plate 226 to swing synchronously around the handle shaft 222. After the button 224 swings, the locking plate 225 and the safety plate 226 move away from their original positions engaging with the ratchet teeth 301 of the ratchet 300, so that they no longer push against or restrict the ratchet 300. At the same time, the safety plate 226 swings with the locking member 223 and disengages from the limit formed by the locking groove 108, allowing the safety plate 226 to pass over the protrusion 109 and enter or approach the unlocking groove 110. At this time, the handle 220 can continue to swing relative to the seat 100 to the release position, thereby providing the operating conditions for releasing the second strap 420 or switching the tensioner 10 state.

[0056] With the above structure, both the locking plate 225 and the safety plate 226 can cooperate with the ratchet 300 to jointly drive and limit the ratchet 300. The safety plate 226 can also cooperate with the locking groove 108, the protrusion 109, and the unlocking groove 110 on the flange plate 102 to limit the position of the locking member 223. After the position of the safety plate 226 is limited by the flange plate 102, the overall position of the locking member 223 is stabilized, and the locking plate 225 can also be stably maintained in the position cooperating with the ratchet 300. Thus, the locking member 223 can improve the reliability of the cooperation with the ratchet 300 through the locking plate 225 and the safety plate 226, and reduce the risk of mis-locking through the cooperation of the safety plate 226 and the flange plate 102, so that the tensioner 10 can achieve stable switching between the tensioned state and the released state.

[0057] See Figure 8 and Figure 9The central shaft 500 also includes a first end 501 and a second end 502 extending out of the base 100. The first end 501 and the second end 502 are arranged opposite each other along the length of the central shaft 500 and are located on the outer sides of the two flange plates 102, respectively. The first end 501 is provided with a coil spring assembly 510, and the second end 502 is provided with a damping assembly 520. The coil spring assembly 510 and the damping assembly 520 are respectively arranged on opposite sides of the base 100, so that they can act on the two ends of the central shaft 500, thereby realizing the automatic retraction and retraction speed control of the second strap 420 without occupying the installation space between the two flange plates 102.

[0058] The coil spring assembly 510 includes a coil spring 511 and a coil spring housing 512. The coil spring housing 512 is fixedly disposed on the outside of one of the flange plates 102, and the coil spring 511 is installed inside the coil spring housing 512. One end of the coil spring 511 is connected to the coil spring housing 512, and the other end is connected to the first end 501 of the central shaft 500, so that the coil spring 511 can elastically deform with the rotation of the central shaft 500. When the second strap 420 is pulled out, the second strap 420 drives the central shaft 500 to rotate in the direction of strap release, and the coil spring 511 is tightened and stores elastic potential energy as the central shaft 500 rotates; when the restriction on pulling out the second strap 420 is released, the coil spring 511 releases the elastic potential energy and drives the central shaft 500 to rotate in the opposite direction, so that the second strap 420 is rewound onto the central shaft 500. The coil spring assembly 510 can apply a rotational force to the central shaft 500 to automatically retract the second strap 420, so that the user does not need to manually organize and rewind the second strap 420 after use, thus improving the ease of use of the tensioner 10.

[0059] The damping assembly 520 includes a damper 521 and a damping housing 522. The damping housing 522 is fixedly disposed on the outside of another flange plate 102, and the damper 521 is installed inside the damping housing 522. A slot 503 is provided at the second end 502 of the central shaft 500, and the damper 521 is provided with a locking block 523 adapted to the slot 503. The locking block 523 is embedded in the slot 503, so that the damper 521 and the second end 502 of the central shaft 500 form a circumferential limiting fit. Through the cooperation of the locking block 523 and the slot 503, when the central shaft 500 rotates, it can drive the input end of the damper 521 to rotate synchronously, so that the damping assembly 520 can apply a corresponding action to the central shaft 500 according to the rotation direction of the central shaft 500.

[0060] The damper 521 is preferably a unidirectional damping structure. When the user pulls out the second strap 420 and drives the central shaft 500 to rotate in the direction of releasing the strap, the damper 521 applies virtually no resistance or only a small resistance to the central shaft 500, allowing the second strap 420 to be pulled out smoothly without affecting the user's ability to quickly unfold the strap and perform the securing operation. When the coil spring assembly 510 drives the central shaft 500 to rotate in the direction of retracting the strap, the damper 521 applies resistance to the central shaft 500, limiting the rotational speed of the central shaft 500, allowing the second strap 420 to retract at a gentler speed. The coil spring assembly 510 provides the power for automatically retracting the second strap 420, and the damper assembly 520 controls the speed of the automatic retraction process. The combination of the two can prevent the second strap 420 from rebounding rapidly under the action of the coil spring 511, thereby reducing the risk of the second strap 420, the second hook 421, or other connecting structures swinging and injuring people, colliding with vehicles, or damaging surrounding objects. The coil spring assembly 510 and the damping assembly 520 act on both ends of the central shaft 500, respectively. The coil spring assembly 510 is used to provide power for the automatic retraction of the second strap 420, and the damping assembly 520 is used to limit the rotational speed of the central shaft 500 in the retraction direction, so that the second strap 420 can be retracted smoothly and safely.

[0061] Specifically, see Figure 10 and Figure 11 An anti-loosening device 600 is provided on the side of the seat body 100 away from the handle 220. The anti-loosening device 600 is disposed on the path through which the second strap 420 extends from the seat body 100, and is used to provide auxiliary anti-loosening restriction for the second strap 420. The anti-loosening device 600 includes a base 610, a clamping member 620, and a driving member 630. The base 610 is fixedly mounted on the base plate 101 of the seat body 100. The clamping member 620 is movably mounted in the base 610 and, together with the base 610, defines a clamping area through which the second strap 420 passes. The driving member 630 is slidably mounted on the base 610 and is used to push the clamping member 620 to release the clamping member 620 from the second strap 420.

[0062] like Figure 12 and Figure 15As shown, the base 610 includes a mounting plate 611, two side plates 612, an upper connecting plate 613, and a clamping part, preferably an inclined plate 614. The mounting plate 611 is fixedly attached to the base plate 101. The two side plates 612 are formed by extending from opposite sides of the mounting plate 611 and are spaced apart from each other. The upper connecting plate 613 is connected between the two side plates 612 and is located on the side of the two side plates 612 away from the mounting plate 611, so that the mounting plate 611, the two side plates 612, and the upper connecting plate 613 together form an installation space for accommodating the clamping member 620. The inclined plate 614 is fixedly disposed between the two side plates 612 and is arranged at an angle relative to the mounting plate 611. The inclined plate 614 is provided with a first helical tooth 615. By tilting the inclined plate 614, the gripping force of the first helical tooth 615 on the second strap 420 is greatly increased.

[0063] Two side plates 612 have a pivot 616 on the side of the inclined plate 614 away from the mounting plate 611, with both ends of the pivot 616 connected to the two side plates 612 respectively. A clamping member 620 has a through hole 621, through which it is fitted onto the pivot 616, allowing it to swing relative to the base 610 around the pivot 616. The clamping member 620 has an extension 622 extending toward the inclined plate 614, with a second helical tooth 623 at its distal end that matches the first helical tooth 615. An oblique clamping opening 624 is formed between the first helical tooth 615 and the second helical tooth 623 for the second strap 420 to pass through. When the second strap 420 moves in the tightening direction, the clamping member 620 can make room and swing, allowing the second strap 420 to pass smoothly. When the second strap 420 is subjected to force in the loosening direction, the second strap 420 drives the clamping member 620 to swing towards the inclined plate 614, causing the second helical tooth 623 to approach the first helical tooth 615, and the oblique clamping opening 624 to gradually narrow, thereby clamping the second strap 420. Because the oblique clamping opening 624 has an obliquely narrowing structure, the greater the loosening pull of the second strap 420, the easier it is for the clamping member 620 to press against the inclined plate 614, and the stronger the biting and clamping force of the first helical tooth 615 and the second helical tooth 623 on the second strap 420, thus forming a tightening anti-loosening effect.

[0064] See Figure 15An elastic element, preferably a torsion spring 617, is also provided on the rotating shaft 616. The torsion spring 617 is sleeved on the rotating shaft 616, with one end acting on the base 610 and the other end acting on the clamping member 620. The torsion spring 617 applies an elastic force to the clamping member 620, causing the clamping member 620 to swing towards the inclined plate 614, so that the clamping member 620 is held in a closed position close to the inclined plate 614 when not pushed by the driving member 630. When the clamping member 620 is in the closed position, the first helical tooth 615 and the second helical tooth 623 together form an oblique clamping opening 624 for preventing the second strap 420 from loosening. When the second strap 420 moves in the tightening direction, it pushes the clamping member 620 to overcome the elastic force of the torsion spring 617 and generate a yielding swing, allowing the second strap 420 to pass smoothly. When the second strap 420 is subjected to force in the loosening direction, the clamping member 620 swings towards the inclined plate 614 under the action of the elastic force of the torsion spring 617 and the tension of the second strap 420, causing the second helical tooth 623 to approach the first helical tooth 615 and clamp the second strap 420. The upper connecting plate 613 is located on the swing path of the clamping member 620 and is used to limit the maximum swing angle of the clamping member 620, prevent the clamping member 620 from overturning, and thus ensure that the clamping member 620 is always within the effective range that can cooperate with the inclined plate 614.

[0065] The outer edge of the lever 200 near the anti-loosening device 600 also has a variable-diameter abutment arc surface 230. The variable-diameter abutment arc surface 230 extends in an arc around the central axis 500 and swings synchronously with the lever 200 around the central axis 500. The variable-diameter abutment arc surface 230 is a continuous arc surface structure. The distance from the variable-diameter abutment arc surface 230 to the central axis 500 gradually changes along the swing direction of the lever 200, so that the variable-diameter abutment arc surface 230 can generate different pushing amounts on the driving member 630 at different swing positions of the lever 200.

[0066] The driving member 630 is slidably disposed on the base 100. Specifically, a driving groove 111 is provided on the flange plate 102 near the base 610. The driving member 630 is at least partially inserted into the driving groove 111 and can reciprocate relative to the base 610 along the driving groove 111. One end of the driving member 630 forms an abutment end 631, which is positioned towards the variable diameter abutment arc surface 230 and can abut against the variable diameter abutment arc surface 230. The other end of the driving member 630 extends a connecting rod 632 towards the clamping member 620. A driving hole 633 is provided on the upper connecting plate 613, and the connecting rod 632 passes through the driving hole 633 and extends towards the clamping member 620. A spring 634 is sleeved on the connecting rod 632. The spring 634 is located between the driving member 630 and the upper connecting plate 613 and is used to push the driving member 630 to reset after it is pressed and moved.

[0067] When the lever 200 swings around the central axis 500, the variable-diameter abutment surface 230 rotates synchronously with the lever 200. Because the drive member 630 is restricted by the drive groove 111, it can only slide relative to the base 610 in a predetermined direction. Therefore, the abutment end 631 of the drive member 630 remains in the abutment position corresponding to the variable-diameter abutment surface 230. As the variable-diameter abutment surface 230 rotates with the lever 200, different radius positions on the variable-diameter abutment surface 230 pass sequentially through the abutment end 631 of the drive member 630, thereby converting the swing of the lever 200 into the sliding of the drive member 630.

[0068] like Figure 13 and Figure 14 As shown, when the lever 200 is in the locked position, the area on the variable diameter abutment arc surface 230 that is smaller in distance from the central axis 500 corresponds to the abutment end 631 of the drive member 630. At this time, the pushing amount of the variable diameter abutment arc surface 230 against the drive member 630 is small, the drive member 630 is not pushed or not moved sufficiently, the connecting rod 632 does not actively push the clamping member 620 to open, and the clamping member 620 is held in the closed position near the inclined plate 614 under the action of the torsion spring 617, so that the first helical tooth 615 and the second helical tooth 623 together form the inclined clamping mouth 624. When the second strap 420 moves in the tightening direction, it can push the clamping member 620 to overcome the elastic force of the torsion spring 617 and generate a swaying motion, allowing the second strap 420 to pass smoothly. When the second strap 420 is subjected to force in the loosening direction, the clamping member 620 swings toward the inclined plate 614 under the action of the torsion spring 617 and the tension of the second strap 420, so that the second helical tooth 623 approaches the first helical tooth 615 and clamps the second strap 420, thereby putting the anti-loosening device 600 in the anti-loosening locking state.

[0069] See Figure 1 and Figure 7When it is necessary to pull out the second strap 420 or automatically retract the second strap 420, the user can use button 224 to disengage the locking plate 225 from the ratchet 300 and swing the lever 200 to the automatic retraction position, thus switching the anti-loosening device 600 to the released state. When the lever 200 is in the automatic retraction position, the locking plate 225 remains in the disengaged position from the ratchet 300, allowing the central shaft 500 to rotate in the retraction direction under the action of the coil spring assembly 510. When the lever 200 swings from the locked position to the automatic retraction position, the area on the variable diameter abutment arc surface 230 that gradually increases in distance from the central shaft 500 moves to the abutment end 631 of the drive member 630. As the distance between the variable-diameter abutment arc surface 230 and the central shaft 500 increases, the pushing force of the variable-diameter abutment arc surface 230 on the driving member 630 gradually increases. The driving member 630 moves along the driving slide groove 111 toward the clamping member 620 and pushes the clamping member 620 to swing around the rotating shaft 616 against the elastic force of the torsion spring 617 via the connecting rod 632. At this time, the clamping member 620 switches from the closed position to the open position, the second helical tooth 623 of the clamping member 620 moves away from the first helical tooth 615 on the inclined plate 614, the inclined clamping port 624 is opened, and the anti-loosening device 600 switches to the loosened state, so that the second strap 420 is released from the clamping restriction. At this time, the coil spring assembly 510 can drive the central shaft 500 to rotate in the retraction direction, so that the second strap 420 automatically retracts in the state of the anti-loosening device 600 being released. The damping assembly 520 limits the rotational speed of the central shaft 500, so that the second strap 420 is retracted smoothly.

[0070] When the lever 200 is in the automatic retracted position, the area on the variable-diameter abutment surface 230 that is farther from the central axis 500 continuously corresponds to the abutment end 631 of the drive member 630. The drive member 630 remains in the position of pushing the connecting rod 632. The connecting rod 632 continuously pushes the locking member 620 to overcome the elastic force of the torsion spring 617 and remains in the open position. The first helical tooth 615 and the second helical tooth 623 remain in the open state. Therefore, in the automatic retracted position, the anti-loosening device 600 remains in the loosened state and will not prevent the coil spring assembly 510 from driving the second strap 420 to retract automatically.

[0071] When the lever 200 swings back from the automatic retraction position to the locking position, the area on the variable-diameter abutment surface 230 that is farther from the central axis 500 gradually moves away from the abutment end 631 of the drive member 630, while the area that is farther from the central axis 500 gradually re-aligns with the abutment end 631 of the drive member 630, and the pushing amount of the variable-diameter abutment surface 230 against the drive member 630 gradually decreases. The spring 634 pushes the drive member 630 to reset along the drive slide 111, the connecting rod 632 retracts from the pushing position on the clamping member 620, and the clamping member 620 returns from the open position to the closed position near the inclined plate 614 under the action of the torsion spring 617, and re-forms an oblique clamping structure with the inclined plate 614. Therefore, the anti-loosening device 600 can automatically switch according to the position of the lever 200: when the lever 200 is in the locked position, the drive member 630 does not actively open the clamping member 620, the clamping member 620 is closed under the action of the torsion spring 617, and the anti-loosening device 600 is in the anti-loosening locked state; when the lever 200 is in the automatic retraction position, the drive member 630 overcomes the action of the torsion spring 617 and opens the clamping member 620, and the anti-loosening device 600 is in the loosened state.

[0072] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0073] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0074] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0075] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tensioner, characterized in that, include: base(100); A central shaft (500) is rotatably mounted on the base (100). A lever (200) is disposed on the central shaft (500) for driving the tightening operation; A ratchet (300) is disposed on the central shaft (500) and cooperates with the lever (200) to drive the central shaft (500) to rotate in the tightening direction when the lever (200) is driven; The strap assembly (400) is at least partially wound around the central axis (500); An anti-loosening device (600) is provided on the extension path of the strap assembly (400) and includes a clamping part and a locking member (620) movable relative to the clamping part. The anti-loosening device (600) has a locked state and a released state. In the locked state, the clamping member (620) approaches the clamping part and abuts against the strap assembly (400) to restrict the strap assembly (400) from moving in the loosening direction. In the released state, the clamping member (620) moves away from the clamping part to release the restriction on the strap assembly (400) and allow the strap assembly (400) to move relative to the seat (100).

2. The tensioner according to claim 1, characterized in that, The anti-loosening device (600) further includes a base (610) and a drive member (630). The clamping part is disposed on the base (610), the locking member (620) is movably mounted on the base (610), and the drive member (630) is movably disposed on the seat (100) for driving the locking member (620) to move relative to the clamping part.

3. The tensioner according to claim 2, characterized in that, The anti-loosening device (600) further includes a rotating shaft (616) and an elastic element. The clamping element (620) is rotatably mounted on the base (610) via the rotating shaft (616). The elastic element is disposed between the base (610) and the clamping element (620) and applies an elastic force to the clamping element (620) to bring it closer to the clamping part.

4. The tensioner according to claim 3, characterized in that, The lever (200) is provided with a variable diameter abutting arc surface (230), one end of the drive (630) abuts against the variable diameter abutting arc surface (230), and the other end cooperates with the clamping member (620).

5. The tensioner according to claim 3, characterized in that, The base (610) includes a mounting plate (611) and two side plates (612), which are formed by extending from both sides of the mounting plate (611), and the two ends of the rotating shaft (616) are respectively connected to the two side plates (612).

6. The tensioner according to claim 5, characterized in that, The base (610) also includes an upper connecting plate (613) connected between the two side plates (612). The upper connecting plate (613) has a drive hole (633). The drive member (630) includes a connecting rod (632). The connecting rod (632) passes through the drive hole (633) and cooperates with the clamping member (620).

7. The tensioner according to claim 6, characterized in that, The seat (100) is provided with a drive groove (111), and the drive component (630) is slidably inserted into the drive groove (111).

8. The tensioner according to claim 6, characterized in that, A spring (634) is fitted on the connecting rod (632), and the spring (634) is located between the driving member (630) and the upper connecting plate (613).

9. The tensioner according to claim 3, characterized in that, The clamping part includes an inclined plate (614) inclinedly disposed on the base (610), the inclined plate (614) is provided with a first inclined tooth (615), the clamping member (620) is provided with a second inclined tooth (623) opposite to the first inclined tooth (615), and an inclined clamping opening (624) is formed between the first inclined tooth (615) and the second inclined tooth (623).

10. The tensioner according to claim 4, characterized in that, The lever (200) has a locked position and an automatic retraction position; when the lever (200) is in the locked position, the area on the variable diameter abutment arc surface (230) that is smaller in distance from the central axis (500) corresponds to the drive member (630), so that the drive member (630) does not push the clamping member (620) away from the clamping part; when the lever (200) is in the automatic retraction position, the area on the variable diameter abutment arc surface (230) that is larger in distance from the central axis (500) corresponds to the drive member (630), so that the drive member (630) pushes the clamping member (620) away from the clamping part.

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