A lace tightener

Abstract

The utility model discloses a shoelace tightener, including casing and pivot, the casing is equipped with accommodating cavity and two symmetrical arrangement in the accommodating cavity both sides and pass through the casing lateral wall and with accommodating cavity intercommunication, is arranged for shoelace, the pivot rotatablely installed in the accommodating cavity, the top of pivot passes the top wall of casing to outside, in order to facilitate user operation, its axle body both sides symmetrical are equipped with extrusion part, and rotating pivot can drive the extrusion part rotates in the accommodating cavity, and user only needs simple rotation pivot to can synchronous drive both sides extrusion part and rotate into the through -bore, thereby and the hole wall cooperation effect, fast, firmly clamps the shoelace, and its internal structure is simple and reliable, need not complicated ratchet and elastic sheet assembly, avoided the transmission failure problem of the small parts fatigue or abrasion, significantly improved the durability and reliability of product, simultaneously, single rotation's operation mode is also more intuitive convenient.

Description

Technical Field

[0001] This utility model relates to the field of fasteners for footwear, and more particularly to a shoelace tightening device. Background Technology

[0002] Existing similar products typically rely on complex internal mechanical structures to achieve the tightening and anti-loosening functions. For example, they may use precise ratchet, pawl, and spring components in a confined space to create a backstop effect.

[0003] However, this multi-component collaborative design not only leads to high production costs, but also suffers from poor structural reliability. The small spring contacts are prone to failure due to metal fatigue after frequent use, and the plastic ratchet teeth are prone to stripping after long-term wear, causing the entire locking function to malfunction and resulting in insufficient durability. In addition, its operation logic mostly requires pressing first and then rotating to achieve tightening, making it relatively cumbersome to use. Utility Model Content

[0004] In view of this, the present invention provides a shoelace tightening device to solve the problems of high production costs, insufficient structural reliability and durability, and cumbersome operation caused by the multi-component collaborative design of existing shoelace tightening devices.

[0005] To achieve one, some, or all of the above objectives or other objectives, this utility model proposes a shoelace tightening device, including a housing and a rotating shaft. The housing has a receiving cavity and two symmetrically arranged through holes on both sides of the receiving cavity. The through holes penetrate the side wall of the housing and communicate with the receiving cavity for shoelaces to be threaded through. The rotating shaft is rotatably installed in the receiving cavity. The top end of the rotating shaft extends out of the top wall of the housing to the outside. The shaft body has symmetrically arranged squeezing parts on both sides. Rotating the rotating shaft can drive the squeezing parts to rotate in the receiving cavity, so that they are in a loose state without interfering with the through holes, or rotate into the through holes on both sides, cooperating with the hole walls to clamp the shoelaces.

[0006] Preferably, a knob is provided at the top of the rotating shaft.

[0007] Preferably, the bottom end of the rotating shaft is rotatably connected to the bottom wall of the receiving cavity.

[0008] Preferably, the top wall of the housing has a clearance opening for connecting to the receiving cavity, the bottom wall of the receiving cavity has a through snap-fit ​​hole, the inner wall of the snap-fit ​​hole has a snap ring made of elastic material coaxially provided, the upper end of the inner wall of the snap ring has a first chamfer, the lower end of the rotating shaft passes through the inner side of the snap ring and has a boss, the diameter of the boss is larger than the inner diameter of the snap ring, and abuts against the lower end of the snap ring.

[0009] Preferably, the lower end of the outer wall of the boss is provided with a second chamfer, the contour of the second chamfer being adapted to the first chamfer.

[0010] Preferably, the housing is provided with a limiting structure for restricting the rotation range of the rotating shaft, so that the squeezing part can only switch between the released state and the clamping state.

[0011] Preferably, the limiting structure is an arc-shaped groove, which is formed on the top wall of the housing and arranged circumferentially along the axis of rotation. The bottom wall of the knob is provided with a sliding column, which is slidably connected in the arc-shaped groove.

[0012] Preferably, the side wall of the extrusion part away from the pivot is provided with a locking tooth. When the extrusion part is in a clamping state, the locking tooth cooperates with the hole wall of the through hole to clamp the shoelace together.

[0013] Preferably, the cross-section of the extrusion part is trapezoidal or approximately trapezoidal, and one end of its long side is fixedly connected to the rotating shaft. The locking teeth include a first protruding tooth and at least two second protruding teeth. The first protruding tooth is vertically disposed on one end of the short side of the extrusion part. The left and right side walls of the extrusion part are symmetrically provided with tooth grooves, so that at least two second protruding teeth are formed on each side wall.

[0014] Preferably, the housing, the rotating shaft, and the knob are all made of plastic.

[0015] Implementing the embodiments of this utility model will have the following beneficial effects: With the aforementioned shoelace tightener, the user only needs to rotate the pivot to simultaneously drive the compression parts on both sides into the threading holes, thus working in conjunction with the hole walls to quickly and securely clamp the shoelaces. Its internal structure is simple and reliable, eliminating the need for complex ratchet and spring assemblies, fundamentally avoiding transmission failures caused by fatigue or wear of small parts, significantly improving the product's durability and reliability. At the same time, the intuitive and convenient single-rotation operation greatly optimizes the user experience. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] in: Figure 1 This is an exploded view of the present invention from a low angle; Figure 2 This is an exploded view of the present invention from a top-down perspective; Figure 3 This is a front view of the present invention in both the clamped and released states.

[0018] In the diagram: 1. Shell; 11. Through hole; 12. Clearance opening; 13. Snap-fit ​​hole; 14. Arc groove; 141. Limiting protrusion; 15. Receiving cavity; 2. Rotating shaft; 21. Boss; 22. Second chamfer; 23. Limiting frustum; 3. Extrusion block; 31. Extrusion part; 32. Tooth groove; 33. First protruding tooth; 34. Second protruding tooth; 4. Knob; 41. Sliding column; 5. Snap ring; 51. First chamfer. Detailed Implementation

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0022] like Figure 1-3 As shown, a shoelace tightening device includes a housing 1 and a rotating shaft 2. The housing 1 has a receiving cavity 15 and two symmetrically arranged through holes 11 on both sides of the receiving cavity 15. The through holes 11 penetrate the side wall of the housing 1 and communicate with the receiving cavity 15 for shoelaces to be threaded through. The rotating shaft 2 is rotatably installed in the receiving cavity 15. The top end of the rotating shaft 2 protrudes through the top wall of the housing 1 to the outside for user operation. A squeezing part 31 is symmetrically arranged on both sides of its shaft. Rotating the rotating shaft 2 can drive the squeezing part 31 to rotate within the receiving cavity 15, allowing it to switch between two positions: one is as follows... Figure 3The lower half of the drawing shows the "loosened state," where the compression part 31 is completely within the receiving cavity 15, not interfering with the threading hole 11. The shoelace can slide freely within the threading hole 11 for threading and adjusting the tightness of the shoelace; the second is as follows... Figure 3 The upper part of the drawing shows the "clamping state." In this state, the squeezing part 31 rotates into the through holes 11 on both sides, working together with the hole walls to squeeze and clamp the shoelaces located therein. The user only needs to simply rotate the shaft 2 to simultaneously drive the squeezing parts 31 on both sides into the through holes 11, thus working in conjunction with the hole walls to quickly and firmly clamp the shoelaces. Its internal structure is simple and reliable, eliminating the need for complex ratchet and spring components, fundamentally avoiding transmission failure caused by fatigue or wear of small parts, and significantly improving the product's durability and reliability. At the same time, the single rotation operation is intuitive and convenient, greatly optimizing the user experience.

[0023] Specifically, the shoelace tightener also includes a squeezing block 3, the cross-section of which is waist-shaped or approximately waist-shaped, and it is centrally fixedly sleeved on the rotating shaft 2. The two ends of the squeezing block 3 form squeezing parts 31.

[0024] In one embodiment, the end face of the extrusion part 31 away from the pivot 2 is provided with anti-slip texture to increase the frictional resistance between it and the shoelace, so as to make its clamping of the shoelace more secure (not shown in the figure).

[0025] Furthermore, a knob 4 is provided at the top of the rotating shaft 2, the diameter of which is larger than the diameter of the rotating shaft 2, so as to provide the user with an operating part that is easy to apply force to the rotating shaft 2 and easy to grip and rotate.

[0026] In one embodiment, the knob 4 is provided with anti-slip texture on its periphery to increase the frictional resistance between the fingers when they pinch the knob 4, thereby improving the stability of operation.

[0027] Furthermore, the bottom end of the rotating shaft 2 is rotatably connected to the bottom wall of the receiving cavity 15.

[0028] Furthermore, the top wall of the housing 1 has a clearance opening 12 that connects to the receiving cavity 15, and the bottom wall of the receiving cavity 15 has a through snap-fit ​​hole 13. A snap-fit ​​ring 5 made of elastic material is coaxially provided on the inner wall of the snap-fit ​​hole 13. The upper end of the inner wall of the snap-fit ​​ring 5 has a first chamfer 51. The lower end of the rotating shaft 2 passes through the inner side of the snap-fit ​​ring 5 and has a boss 21. The diameter of the boss 21 is slightly larger than the inner diameter of the snap-fit ​​ring 5 and abuts against the lower end of the snap-fit ​​ring 5. During assembly, the bottom end of the rotating shaft 2 can extend into the snap-fit ​​hole 13 through the clearance opening 12. The boss 21 will open the elastic snap-fit ​​ring 5 and finally lock under the snap-fit ​​ring 5, thereby axially limiting the rotating shaft 2 on the housing 1 without hindering its free rotation, thus improving the installation efficiency of the rotating shaft 2.

[0029] Furthermore, the lower end of the outer wall of the boss 21 is provided with a second chamfer 22. The outline of the second chamfer 22 is adapted to the first chamfer 51. When the boss 21 passes through the retaining ring 5, the inclined surfaces of the second chamfer 22 and the first chamfer 51 play a guiding role, so that the boss 21 can more smoothly open the retaining ring 5 and slide into the predetermined position, reducing the assembly difficulty of the two.

[0030] Furthermore, the housing 1 is provided with a limiting structure for limiting the rotation range of the rotating shaft 2. This structure ensures that when the user rotates the rotating shaft 2, the pressing part 31 can only switch between the two defined positions of "releasing state" and "clamping state" mentioned above, so as to avoid the mechanism from jamming or failing due to excessive rotation.

[0031] In one embodiment, the limiting structure is a limiting groove provided on the inner wall of the adapter end of the housing 1. The limiting groove is arranged circumferentially along the adapter end of the housing 1. A slider is provided on the side wall of the rotating shaft 2. The slider is slidably connected in the limiting groove, thereby limiting the rotation range of the rotating shaft 2 (not shown in the figure).

[0032] Furthermore, the limiting structure is an arc-shaped groove 14, which is formed on the top wall of the housing 1 and arranged circumferentially along the rotating shaft 2. A sliding post 41 is provided on the bottom wall of the knob 4, and the sliding post 41 is slidably connected within the arc-shaped groove 14. When the knob 4 is rotated, the sliding post 41 slides within the arc-shaped groove 14. The central angle of the arc-shaped groove 14 determines the maximum rotation angle of the rotating shaft 2. When the sliding post 41 slides to either end of the arc-shaped groove 14, it is blocked, thus achieving rotational limiting. In this embodiment, the central angle corresponding to the arc-shaped groove 14 is 90 degrees, and the rotating shaft 2 can only rotate forward and backward within this angle range.

[0033] In a preferred embodiment, each sidewall of the arc-shaped groove 14 near its end is provided with a limiting protrusion 141. Taking the clamping state as an example, when the external force drives the sliding column 41 to squeeze and slide past the limiting protrusion 141 to the corresponding end of the arc-shaped groove 14, the squeezing part 31 is in the clamping state. At this time, the limiting protrusion 141 will restrict the sliding column 41 to slide back to its original position, so that the squeezing part 31 is maintained in the clamping state, ensuring the positioning ability of the squeezing part 31 in the corresponding state and improving the stability of the shoelace tightener.

[0034] In a preferred embodiment, a limiting frustum 23 is coaxially provided on the rotating shaft 2. The limiting frustum 23 is rotatably connected to the relief opening 12 so as to provide additional support for the rotating shaft 2 through the inner wall of the relief opening 12, thereby further improving the installation stability of the rotating shaft 2.

[0035] Furthermore, the side wall of the pressing part 31 away from the rotating shaft 2 is provided with locking teeth. When the pressing part 31 is in a clamping state, these locking teeth extend into the through hole 11 and work together with the hole wall of the through hole 11 to clamp the shoelace located therein like the jaws of a vise. The locking teeth can significantly increase the friction with the surface of the shoelace, effectively preventing the shoelace from easily coming loose when under force.

[0036] Furthermore, the cross-section of the extrusion part 31 is trapezoidal or approximately trapezoidal, and one end of its long side is fixedly connected to the rotating shaft 2. The locking teeth include a first protruding tooth 33 and at least two second protruding teeth 34. The first protruding tooth 33 is vertically arranged on one end of the short side of the extrusion part 31. The left and right side walls of the extrusion part 31 are symmetrically provided with tooth grooves 32, so that at least two second protruding teeth 34 are formed on each side wall. This design allows the extrusion part 31 to bite the shoelace from multiple directions from the front end and the left and right sides at the same time, forming a multi-dimensional clamping, which can better adapt to the deformation arc of the shoelace clamped part, making the clamping more stable and reliable.

[0037] Furthermore, the housing 1, the pivot 2, and the knob 4 are all made of plastic and molded using an injection molding process. Plastic has the advantages of low cost, light weight, easy mass production, and corrosion resistance, making it more suitable for outdoor use environments.

[0038] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A shoelace tightening device, characterized in that, include: housing and shaft; The housing has a receiving cavity and two symmetrically arranged through holes on both sides of the receiving cavity. The through holes pass through the side wall of the housing and are connected to the receiving cavity for shoelaces to be threaded through. The rotating shaft is rotatably installed in the receiving cavity, and the top end of the rotating shaft extends through the top wall of the housing to the outside. The shaft body is symmetrically provided with extrusion parts on both sides. Rotating the shaft can drive the squeezing part to rotate within the receiving cavity, so that it is in a loose state that does not interfere with the through hole, or rotate into the through holes on both sides, cooperating with the hole walls to clamp the shoelaces together.

2. The shoelace tightener according to claim 1, characterized in that, A knob is provided at the top of the rotating shaft.

3. A shoelace tightener according to claim 2, characterized in that, The bottom end of the rotating shaft is rotatably connected to the bottom wall of the receiving cavity.

4. A shoelace tightener according to claim 3, characterized in that, The top wall of the housing has a clearance opening for connecting to the receiving cavity, and the bottom wall of the receiving cavity has a through snap-fit ​​hole. A snap-fit ​​ring made of elastic material is coaxially provided on the inner wall of the snap-fit ​​hole. The upper end of the inner wall of the snap-fit ​​ring has a first chamfer. The lower end of the rotating shaft passes through the inner side of the snap-fit ​​ring and has a boss. The diameter of the boss is larger than the inner diameter of the snap-fit ​​ring and abuts against the lower end of the snap-fit ​​ring.

5. A shoelace tightener according to claim 4, characterized in that, The lower end of the outer wall of the boss is provided with a second chamfer, the contour of which is adapted to the first chamfer.

6. A shoelace tightener according to claim 2, characterized in that, The housing is provided with a limiting structure to restrict the rotation range of the rotating shaft, so that the squeezing part can only switch between the released state and the clamping state.

7. A shoelace tightener according to claim 6, characterized in that, The limiting structure is an arc-shaped groove, which is formed on the top wall of the housing and arranged circumferentially along the axis of rotation. The bottom wall of the knob is provided with a sliding column, which is slidably connected in the arc-shaped groove.

8. A shoelace tightener according to claim 1, characterized in that, The side wall of the extrusion part away from the pivot is provided with a locking tooth. When the extrusion part is in a clamping state, the locking tooth cooperates with the hole wall of the through hole to clamp the shoelace together.

9. A shoelace tightener according to claim 8, characterized in that, The cross-section of the extrusion section is trapezoidal or approximately trapezoidal, and one end of its long side is fixedly connected to the rotating shaft. The locking teeth include a first protruding tooth and at least two second protruding teeth. The first protruding tooth is vertically disposed on one end of the short side of the extrusion section. The left and right side walls of the extrusion section are symmetrically provided with tooth grooves, so that at least two second protruding teeth are formed on each side wall.

10. A shoelace tightener according to claim 2, characterized in that, The housing, shaft, and knob are all made of plastic.

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