CN220056297U - Lace tightening device - Google Patents

Abstract

The utility model discloses a lace tightening device, which comprises a spiral cover, a shell and a winding reel for winding a lace; the spiral cover is detachably and synchronously connected with the winding reel in a rotating way; the spin cover is provided with a catch pin thereon, the spool is provided with a catch ring, the catch ring includes a first position and a second position, and the catch pin is configured to be switchable between the first position and the second position with respect to the catch ring. When the stop pin is positioned at the first position, the spiral cover is connected with the winding reel in a synchronous rotation way, the non-return mechanism is engaged, and the lace tightening device can only rotate along the direction of tightening the lace; when the stop pin is at the second position, the spiral cover is separated from the winding reel, the non-return mechanism is separated, and the lacing can drive the winding reel to rotate so as to realize the loosening of the lacing. The lace tightening device provided by the utility model is simple and convenient to operate, and the lace is wound smoothly.

Description

Lace tightening device

Technical Field

The utility model relates to the technical field of tightening of laces, in particular to a lace tightening device.

Background

Automatic lacing fastening devices are widely used at present. The lacing tightening device can tighten or loosen the lacing through simple rotation and pulling, thereby effectively improving the closing tightening efficiency of various pull ropes, strips and articles.

So that the lace is smoothly folded and unfolded, and the convenient operation is particularly important for the lace tightening device.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent. To this end, an object of the present utility model is to propose a lace tightening device comprising a rotary cover, a housing and a reel for winding the lace; the winding reel is rotatably arranged in the shell, and the spiral cover is rotatably arranged on the shell; the spiral cover is detachably and synchronously connected with the winding reel in a rotating way; the rotary cover is provided with teeth, and the shell is provided with pawls corresponding to the teeth;

a stop pin is arranged on the spiral cover, the winding reel is provided with a check ring, the check ring comprises a first position and a second position, and the stop pin is configured to be switched between the first position and the second position relative to the check ring;

when the stop pin is in a first position relative to the check ring, the spiral cover is connected with the winding reel in a synchronous rotation mode, and the pawl of the shell is meshed with the teeth of the spiral cover;

when the catch pin is in a second position relative to the collar, the cap is disengaged from the spool, the pawl of the housing is disengaged from the teeth of the cap, and the spool is free to rotate relative to the cap.

When the stop pin is in a first position relative to the stop ring, the cap is in synchronous rotational connection with the spool, and the pawl of the housing engages the teeth of the cap, thereby preventing rotation of the cap and the spool in a direction to loosen the tie when a loosening force is applied to the cap; while allowing the cap and spool to be rotated in a direction to tighten the lace when a tightening force is applied to the cap.

Preferably, the screw cap, the housing and the spool are coaxially disposed. The common axis is the central axis of the lace tightening device.

Preferably, pulling or pressing the screw cap, the blocking pin is switchable between the first and second positions relative to the collar.

Preferably, the lace tightening device further comprises a base.

Preferably, the spool comprises a central shaft part with an inner cavity, and a first flange and a second flange which are arranged on the periphery of the central shaft part and extend outwards, wherein an accommodating space is formed between the first flange and the second flange, and the retainer ring is arranged in the inner cavity of the central shaft part of the spool.

Preferably, the plane of the bottom surface of the screw cap is parallel to the plane of the second flange of the spool.

Preferably, the bottom surface of the first flange is flush with an end surface of the central shaft member.

Preferably, the other end of the middle shaft member protrudes from the surface of the second flange.

Preferably, the inner cavity of the middle shaft piece comprises a wiring module cavity and a position switching module cavity which are arranged in a step mode, wherein the wiring module cavity is used for wiring in the coupling process of the lacing wire and the winding reel.

Preferably, a retainer ring is arranged on the inner wall of the position switching module cavity, and the retainer ring is matched with the stop pin of the spiral cover to realize the position switching function of the lace tightening device.

Preferably, the spool further includes a blocking piece for separating the routing module cavity from the position switching module cavity. The wiring module cavity and the position switching module cavity of the winding reel are completely separated by the baffle plate, so that the tie tightening device can avoid mutual interference between the knot and the baffle pin of the tie in the actual use process, and the normal use of the tie tightening device is ensured.

Preferably, the baffle plate and the winding reel can be integrally formed, or can be connected together after being respectively formed.

Preferably, a fastening position is arranged in the inner cavity of the middle shaft piece, and the baffle plate is fixed in the inner cavity of the middle shaft piece through the fastening position.

Preferably, a first opening is arranged on one side of the wiring module cavity adjacent to the first flange. The first opening is used for observing the wiring condition of the lacing in the wiring module cavity.

Preferably, a side of the position switching module cavity adjacent to the second flange is provided with a second opening.

Preferably, the stop pin is disposed on a central axis of the screw cap.

Preferably, a first accommodating cavity is formed in the inner bottom surface of the spiral cover, and the retaining pin is arranged in the accommodating cavity.

Preferably, the stop pin and the screw cap are integrally formed or are fixedly connected together after being formed respectively.

Preferably, the stop pin is a snap stop pin.

Preferably, the elastic stopper includes two elastic pieces having protrusions separated from each other.

Preferably, the stop pin is inserted into the position switching module cavity through the second opening, and the stop pin is in contact with the inner wall of the retainer ring.

The protruding parts of the two elastic sheets of the elastic stop pin interact with the check ring, so that synchronous rotation connection of the spiral cover and the winding reel is realized, and meanwhile, the state that teeth on the spiral cover are kept engaged with pawls of the shell is also realized.

Preferably, the detachable synchronous rotation connection mode of the spiral cover and the winding reel comprises at least one of a meshing tooth, a magnetic attraction mode and a key connection mode.

Preferably, the spiral cover is provided with a first engagement tooth, the winding reel is provided with a second engagement tooth, and the first engagement tooth and the second engagement tooth are in two states of engagement and separation, so that detachable synchronous rotation connection of the spiral cover and the winding reel is realized.

Preferably, the first engagement teeth are provided inside the cap and extend in the spool direction.

Preferably, the second engaging teeth are disposed on an end face of the second flange facing the screw cap and extend toward the screw cap, or at least one second accommodating cavity is disposed on a side of the second flange facing the screw cap, and the second engaging teeth are disposed in the second accommodating cavity.

Preferably, the first and second biting teeth are segmented teeth or circumferential teeth. The first and second biting teeth each include a single tooth and a tooth gap. The segmented teeth are characterized by comprising a plurality of arc-shaped tooth segments which are circumferentially arranged, wherein single teeth and tooth gaps in each tooth segment are uniformly arranged at intervals, and no teeth are arranged between the tooth segments. By circumferential teeth is meant that the single teeth and the tooth gaps are evenly spaced over the circumference.

Preferably, each arc-shaped tooth segment in the segmented teeth is uniformly arranged at intervals.

Preferably, the first and second engagement teeth are at least partially single toothed to effect engagement.

More preferably, each single tooth in the first engaging tooth and the second engaging tooth is arranged in a one-to-one correspondence.

More preferably, the first engaging teeth and the second engaging teeth are both circumferential teeth, and the shape of the tooth gap in the circumferential teeth is matched with the shape of the single tooth. Namely: when the first meshing teeth and the second meshing teeth are meshed, single teeth and tooth gaps of the first meshing teeth and the second meshing teeth are mutually complemented in a form fit mode, namely, the first meshing teeth and the second meshing teeth are in a meshed state.

Preferably, the single tooth of the first engaging tooth includes a first side surface and a second side surface, and the included angles between the first side surface and the second side surface and the plane of the bottom surface of the spiral cover are acute angles.

Similarly, the single tooth of the second engaging tooth also includes a third side and a fourth side, and the included angles between the third side and the fourth side and the plane of the second flange of the winding reel are acute angles.

Preferably, when the first engagement tooth and the second engagement tooth are in an engaged state, a tension force is applied to the screw cap, and the first side surface of the single tooth in the first engagement tooth abuts against the third side surface of the single tooth in the second engagement tooth.

Preferably, the single tooth of the first engaging tooth includes a first side surface and a second side surface, and an included angle between the first side surface and a plane where the bottom surface of the spiral cover is located is an acute angle of not less than 30 °.

Preferably, the single tooth of the second engaging tooth includes a third side and a fourth side, and an included angle between the third side and a plane of the second flange of the spool is an acute angle of not less than 30 °.

More preferably, the included angle between the first side surface of each single tooth in the first engaging teeth and the plane of the bottom surface of the spiral cover is an acute angle of not less than 60 degrees.

More preferably, the third side of each single tooth of the second engagement teeth forms an acute angle of not less than 60 ° with the plane of the second flange of the spool.

Further preferably, the first side surface of each single tooth in the first engaging teeth and the plane of the bottom surface of the spiral cover form an included angle of 80+/-5 degrees.

Further preferably, the third side of each single tooth of the second engagement teeth is at an angle of 80±5° to the plane of the second flange of the spool.

When the spiral cover rotates along the direction of tightening the lacing, the first side surface of each single tooth in the first meshing tooth and the second meshing tooth is mutually abutted; when the included angle between the single tooth of the second engaging tooth and the plane where the second flange of the winding reel is located is an acute angle, the abutment force applied to the first side of the single tooth of the first engaging tooth by the third side of the single tooth of the second engaging tooth has an axially downward component force, and the component force enables the first engaging tooth to be engaged with the second engaging tooth more tightly, so that accidental disengagement of the two engaging teeth in the use process is effectively prevented. Stated another way, the cap and the spool mate more and more tightly as the cap is rotated in the tightening direction due to the interaction between each single tooth when the first and second teeth are engaged. From another angle, because the first and second biting teeth are engaged in the axial direction of the lace tightening device when switching from the disengaged state to the engaged state, if the third side of each single tooth of the second biting teeth has a relatively small angle with the plane of the second flange, the first biting tooth is prevented from smoothly entering the tooth gap of the second biting tooth for engagement, the angle is preferably in the range of an acute angle of not less than 60 °. Therefore, the first engagement teeth and the second engagement teeth not only can ensure smooth switching between the separation state and the engagement state, but also can ensure that even if tension is applied to the spiral cover in the engagement state of the first engagement teeth and the second engagement teeth, the spiral cover can be continuously and firmly combined with the winding reel without unexpected disconnection.

The beneficial effects of the utility model are as follows:

1. according to the lace tightening device, the spiral cover is detachably and synchronously connected with the winding reel in a rotating way, the spiral cover is provided with the stop pin, and the winding reel is internally provided with the check ring; the spiral cover is provided with teeth, and the shell is provided with pawls corresponding to the teeth; when the stop pin of the screw cap is in a first position relative to the collar of the spool, the screw cap is in synchronous rotational connection with the spool, and the collar interacts with the stop pin such that the teeth of the screw cap remain engaged with the pawl of the housing, allowing only rotation of the lace tightening device in the direction of tightening the lace.

2. The space isolation is carried out on the wiring module cavity and the position switching module cavity of the winding reel through the baffle plate, so that the phenomenon that the baffle pin and the lacing joint are mutually interfered can be effectively prevented, and the normal use of the lacing tightening device is ensured.

3. The spiral cover and the winding reel are connected in a detachable rotating way through the engagement teeth, and one side face of the engagement teeth is set to be the inclined teeth in a specific angle range, so that the engagement of the two engagement teeth becomes tighter and tighter along with the continuous rotation of the spiral cover along the tightening direction, and the accidental disconnection of the spiral cover and the winding reel in the using process of the lace tightening device is effectively avoided.

4. The lace tightening device provided by the utility model is simple and convenient to operate, and the lace is smoothly retracted and released.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of a lace tightening device;

FIG. 2 is a schematic view of a screw cap in the lace tightening arrangement of FIG. 1;

FIG. 3 is a schematic view of a spool in the lace tightening device of FIG. 1, wherein FIG. 3a is a top view of the spool shown in FIG. 1 and FIG. 3b is a cross-sectional view of the spool shown in FIG. 3a in the direction A-A; FIG. 3c is a bottom view of the spool shown in FIG. 1;

FIG. 4 is a schematic view showing a combination structure of the cap of FIG. 2 and the spool of FIG. 3 after the cap is coupled, wherein FIG. 4a is a perspective view of the combination structure, FIG. 4B is a top view of FIG. 4a, FIG. 4C is a sectional view taken along line B-B of FIG. 4B, and FIG. 4d is a partially enlarged view taken along line C of FIG. 4C;

FIG. 5 is a schematic view of an assembled configuration of the lace tightening device of FIG. 1;

FIG. 6 is a cross-sectional view of the lace tightening device of FIG. 5 as switched to a first position;

fig. 7 is a cross-sectional view of the lace tightening device of fig. 5 as switched to a second position;

FIG. 8 is a schematic view of the lace tightening device of FIG. 5 after coupling with a lace; wherein fig. 8a is a perspective view, fig. 8b is a top view of fig. 8a, and fig. 8C is a cross-sectional view along C-C in fig. 8 b.

Description of main reference numerals:

1-screwing a cover; 11-a snap pin; 12-first biting teeth; 12A-single tooth; 121-a first side; 122-a second side; 13-ring teeth; 14-buckling position;

2-a housing; 21-ratchet wheel; 211-a pawl; 22-buckling protrusions; 23-clamping buckles;

3-a spool; 31-a central shaft member; 311-wiring module cavity; 312-a position switching module cavity; 32-a first flange; 33-a second flange; 34-check ring; 35-second biting teeth; 35A-single tooth; 351-a third side; 352-fourth side; 36-a first opening; 37-a second opening; 38-a snap-fit position; 39-baffle plates;

4-a base; 41-clamping holes; 5-lacing; 51-knot.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is level less than the second feature.

Examples

Referring to fig. 1, in the present embodiment, a lace tightening device is provided, which includes a rotary cover 1, a housing 2, a spool 3 for winding a lace, and a base 4, wherein the housing 2 and the base 4 are collectively referred to as a stator. The spiral cover 1 is detachably and synchronously connected with the winding reel 3 in a rotating way, the spiral cover 1 is rotatably connected with the shell 2, and the winding reel 3 is rotatably arranged in the shell 2. The ratchet 21 is fixed on the upper end surface of the housing 2 by a snap structure.

Referring to fig. 1 and 2, the cap 1 is provided with an annular tooth 13, and the ratchet 21 includes pawls 211 corresponding to the annular tooth 13, each pawl 211 being provided with a pawl tooth that can be engaged with a single tooth of the annular tooth 13; when the ring-shaped teeth 13 of the screw cap 1 are engaged with the pawl teeth of the ratchet wheel 21, the screw cap 1 can be rotated only in the direction of tightening the lace, but not in the direction of loosening the lace, so that accidental loosening of the lace during actual use can be avoided. The annular teeth 13 on the screw cap 1 are circumferential teeth in this embodiment, but in other preferred embodiments, segmented teeth or the like may be provided on the screw cap 1.

Referring to fig. 2 and 3b to 3c, the cap 1 is provided with a snap pin 11 along a central axis Z direction (see fig. 4 a), and the spool 3 is provided with a retainer ring 34 engaged with the snap pin 11. The winding reel 3 comprises a central shaft part 31 with an inner cavity, the inner cavity of the central shaft part 31 comprises a wiring module cavity 311 and a position switching module cavity 312 which are arranged in a stepped mode, the wiring module cavity 311 is used for threading the winding reel 3 and a lacing, a check ring 34 is arranged on the inner wall of the position switching module cavity 312, and the position switching function of the lacing tightening device is achieved through cooperation with the elastic stop pin 11 of the spiral cover 1. As a preferred form of this embodiment, the side of the position switch module cavity 312 adjacent to the second flange 33 is provided with a second opening 37. The snap pin 11 is inserted into the retainer ring 34 through the second opening 37, wherein the snap pin 11 is in contact with the inner wall of the retainer ring 34. The elastic stop pin 11 comprises two mutually separated elastic pieces 111 with protrusions, wherein the two elastic pieces are in an open state, and a space exists between the two elastic pieces; while the collar 34 has a portion that protrudes inwardly into the shaft lumen. When the snap pin 11 is radially pressed, the distance between the two elastic pieces 111 is reduced, allowing the snap pin 11 to be switched from the first position of the retainer ring 34 (below the projection of the retainer ring 34) to the second position of the retainer ring 34 (above the projection of the retainer ring 34) by the action of the axial external force.

Referring to fig. 3a-3c, the spool 3 further includes a first flange 32 and a second flange 33 provided at the outer circumference of the central shaft member 31 and extending outwardly in the radial direction of the central shaft member, and a receiving space for winding the tie is formed between the first flange and the second flange, wherein the bottom surface of the first flange 32 is flush with one end surface of the central shaft member 31, the other end of the central shaft member 31 protrudes from the surface of the second flange 33, and the end surface of the second flange 33 facing the spin cover 1 is provided with second engagement teeth 35. In other preferred embodiments, the side of the second flange 33 facing the screw cap 1 is provided with at least one second receiving cavity in which the second snap teeth 35 are arranged.

Referring to fig. 2, a ring of first engaging teeth 12 is further provided around the central axis Z of the cap 1, and the second engaging teeth 35 cooperate with the first engaging teeth 12 of the cap 1 to realize detachable synchronous rotational connection of the cap 1 and the spool 3. In other preferred embodiments, the rotary cover 1 and the winding reel 3 can be connected in a detachable synchronous rotation manner by other modes such as magnetic attraction and key connection, and can be connected in a detachable synchronous rotation manner by a combination mode such as engagement tooth matching magnetic attraction.

Referring to fig. 4, the screw cap 1 is coaxially disposed with the spool 3 and is detachably coupled in synchronous rotation by the first and second engagement teeth 12 and 35, and the first and second engagement teeth 12 and 35 have both states of engagement and disengagement to realize the detachably coupled in synchronous rotation of the screw cap and the spool. As shown in fig. 4c, the first engagement teeth 12 and the second engagement teeth 35 are engaged, and the rotation of the cap 1 can drive the spool 3 to rotate synchronously.

Referring to fig. 2 and 4c, the first engagement teeth 12 are provided inside the spin cover 1, around the snap pin 11, and extend in the direction of the spool 3; the second engagement teeth 35 are provided on the second flange 33 side of the spool 3 and extend in the direction of the cap 1. The first and second biting teeth 12 and 35 are both circumferential teeth. The first and second biting teeth 12, 35 each include a single tooth (12 a,35 a) and a backlash. The single tooth 12A of the first biting tooth 12 is fitted to the backlash position of the second biting tooth 35; similarly, the single tooth 35A of the second biting tooth 35 is fitted to the backlash position of the first biting tooth 12. In this way, the single teeth and the backlash of the first engaging teeth 12, the second engaging teeth 35 complement each other in a form-fitting manner, i.e., the two are in an engaged state.

Referring to fig. 4c, the single tooth 12A of the first engaging tooth 12 includes a first side 121 and a second side 122, and the angles between the first side 121 and the second side 122 and the plane of the bottom surface of the screw cap 1 are acute angles. Specifically, the included angle α between the first side 121 of the single tooth 12A of the first engaging tooth 12 and the plane L1 on which the bottom surface of the screw cap 1 is located is 80 °. Similarly, the single tooth 35A of the second engagement tooth 35 includes a third side 351 and a fourth side 352, and the angles between the third side 351 and the fourth side 352 and the plane L2 of the second flange of the spool 3 are acute. Specifically, the third side 351 of the single tooth 35A of the second engagement tooth 35 forms an angle β of 80 ° with the plane L2 of the second flange of the spool 3. In other preferred embodiments, the angle between the first side of the single tooth of the first engaging tooth 12 and the plane of the bottom surface of the screw cap is an acute angle of not less than 30 °, and more preferably an acute angle of not less than 60 °. Likewise, the angle between the third side of the single tooth of the second engagement tooth 35 and the plane of the second flange of the spool is an acute angle of not less than 30 °, and more preferably an acute angle of not less than 60 °.

When a tightening force is applied to the screw cap 1 while the first and second biting teeth 12 and 35 are in the engaged state shown in fig. 4c, the first side face 121 of the single tooth 12A of the first biting tooth 12 abuts against the first side face 351 of the single tooth 35A of the second biting tooth 35. With reference to fig. 4c and 4d, the abutment force F applied by the first side of the single tooth 35A of the second biting tooth to the first side of the single tooth 12A of the first biting tooth has an axially downward component F1, which component F1 causes the first biting tooth 12 to bite more tightly with the second biting tooth 35, thus effectively preventing accidental disengagement of the two biting teeth during use. Stated another way, when a tension is applied to the cap 1, the first side surfaces of each single tooth of the first and second engagement teeth 12, 35 in the engaged state abut against each other, and an axial component of the abutment force is generated, so that the cap 1 and the spool 3 are fitted more and more tightly with the rotation of the cap in the tightening direction.

Referring to fig. 5-7, the lace tightening structure has two operating states that are switched by axial movement of the screw cap. As shown in fig. 6, the snap pin 11 is in a first position with respect to the retainer ring 34 (the protrusion of the snap pin is located below the protrusion of the retainer ring), and at this time, the first engagement teeth 12 and the second engagement teeth 35 are engaged, and the teeth of the cap and the pawl of the housing can be kept engaged all the time by the interaction of the snap pin 11 with the retainer ring 34 without pulling the cap 1. At this time, the screw cap can be rotated only in a direction of tightening the tying band; when the cap is pulled up, the snap pin 11 and the retainer ring 34 slide relatively in the axial direction, at this time, the protruding portion of the retainer ring 34 presses the two elastic pieces of the snap pin 11 so that the space between the two elastic pieces is reduced to go beyond the necked-down portion caused by the protruding portion of the retainer ring, so that the cap 1 can move axially upward with respect to the housing 2, as shown in fig. 7, at this time, the snap pin 11 is in the second position (the protruding portion of the snap pin is located above the protruding portion of the retainer ring) with respect to the retainer ring 34, the first engaging tooth 12 and the second engaging tooth 35 are separated, the tooth of the cap is separated from the pawl of the housing, and rotation of the cap cannot cause rotation of the spool. In this state, the spool 3 is freely rotatable under the pulling action of the lace, so that the lace can be loosened by pulling the lace. In order to avoid the situation that the screw cap 1 is separated from the shell 2 when the screw cap 1 is pulled up, three buckling positions 14 can be arranged on the inner side wall of the screw cap 1, and a circle of buckling position protrusions 22 are arranged on the end face of the shell 2. When the cap 1 is pulled, the catching protrusion 22 will restrict the upward movement of the catching part 14 so that the cap 1 is not separated from the case 2.

When the lace tightening device is switched from the lace-releasing state to the lace-tightening state, the screw cap 1 needs to be pressed so that the snap pin 11 is again in the first position with respect to the retainer ring 34, and the first engaging tooth 12 and the second engaging tooth 35 are again switched from the separated state to the engaged state, that is: each single tooth of the first engaging teeth 12 needs to pass over the tooth tip of each single tooth of the second engaging teeth 35 and then enter the tooth gap of the second engaging teeth, and since the first side surface of the second engaging teeth 35 forms an acute angle beta with the plane of the second flange (parallel to the plane of the bottom of the screw cap), a certain obstruction is caused to the smooth insertion of the first engaging teeth, if the acute angle beta is smaller, the larger the resistance of the first engaging teeth to be inserted into the tooth gap of the second engaging teeth is, even the non-insertion is, so the range of the included angle beta is preferably an acute angle of not less than 30 degrees, more preferably an acute angle of not less than 60 degrees _， Therefore, the first meshing teeth and the second meshing teeth can be smoothly switched between the separation state and the meshing state, and simultaneously, even if tension is applied to the spiral cover in the meshing state of the first meshing teeth and the second meshing teeth, the spiral cover can be continuously and firmly combined with the winding reel without accidental disconnection.

The present embodiment provides a strap tightening mechanism that is coupled to the strap 5 as described in patent 202211616513.6 and the structure after coupling to the strap as described in connection with figures 8a-8c. As a preferred implementation of this embodiment, the spool 3 includes a blocking piece 39, and the blocking piece 39 is used to separate the routing module cavity 311 and the position switching module cavity 312. The baffle 39 and the winding reel 3 may be integrally formed, or may be formed separately and then connected. Preferably, as shown in fig. 3b and 3c, 3 fastening positions 38 are provided in the inner cavity of the central shaft member 31, and the blocking piece 39 is fixed in the inner cavity of the central shaft member 31 by the fastening positions 38. Specifically, the side of the wiring module cavity 311 adjacent to the first flange 32 is provided with the first opening 36, the blocking piece 39 is pressed down after being placed into the inner cavity of the central shaft member from the first opening 36, the blocking piece 39 is positioned bidirectionally by the step and the clamping position 38 of the inner cavity of the central shaft member, and no matter the winding reel is in the threading state or the normal use state, the blocking piece 39 can not fall from the winding reel 3. Other structures of the winding reel 3 can participate in the patent CN219098402U, and the winding reel 3 in this embodiment completely separates the wiring module cavity from the position switching module cavity through the blocking piece 39, so that the tie tightening device can avoid mutual interference between the tie knot 51 and the blocking pin in the actual use process, thereby ensuring normal use of the tie tightening device.

Referring to fig. 1, a buckle 23 (not all shown in the drawings) may be provided at the bottom of the housing 2, and a clamping hole 41 corresponding to the buckle 23 may be provided on the base 4, so that the connection between the housing 2 and the base 4 can be completed by clamping the buckle 23 into the clamping hole 41. Wherein, the base 4 can be fixed on the wearable articles such as shoes, clothes, bags, medical protective clothing and the like by sewing or adhesion of needle and thread. In other preferred embodiments, the lace tightening device may not include a base and the housing 2 is provided with a mounting flange for securing to the wearable item, in which case the stator would include only the housing. In this embodiment the so-called stator is stationary relative to the wearable article, but in other embodiments the screw cap may also constitute the stator, since the movement and the stationary are opposite.

After the lace tightening device of the embodiment is assembled, the rotary cover is pressed, the elastic stop pin is positioned at a first position relative to the retainer ring, the first meshing teeth and the second meshing teeth are meshed, and the pawl of the shell is engaged with the tooth of the rotary cover; the cap is rotated in the tightening direction to hear a clear click, and at this time, the cap drives the spool to rotate synchronously to tighten the lace until the tightening is appropriate. If the tightening is felt to be too tight, the cap can be pulled up to disengage the first engagement teeth of the cap from the second engagement teeth of the spool, and the pawl-teeth are disengaged, at which time the tightening of the lace will drive the spool in reverse rotation to unwind the article. And then the screwing cover is pressed down, the previous action of tightening the lacing is repeated, and the object to be fastened is adjusted to the proper tightness degree.

In this embodiment, a pawl-tooth structure is used as the non-return mechanism, and in other embodiments, the non-return mechanism may also use a groove-pin elastic component-a non-return member in CN216256587U, or may also use a swing arm-groove-stop structure in CN 215837385.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (10)

1. A lace tightening device comprises a spiral cover, a shell and a winding reel for winding a lace; the winding reel is rotatably arranged in the shell, and the spiral cover is rotatably arranged on the shell; the spiral cover is detachably and synchronously connected with the winding reel in a rotating way; the rotary cover is provided with teeth, and the shell is provided with pawls corresponding to the teeth;

it is characterized in that the method comprises the steps of,

a stop pin is arranged on the spiral cover, the winding reel is provided with a check ring, the check ring comprises a first position and a second position, and the stop pin is configured to be switched between the first position and the second position relative to the check ring;

when the stop pin is in a first position relative to the check ring, the spiral cover is connected with the winding reel in a synchronous rotation mode, and the pawl of the shell is meshed with the teeth of the spiral cover;

when the catch pin is in a second position relative to the collar, the cap is disengaged from the spool, the pawl of the housing is disengaged from the teeth of the cap, and the spool is free to rotate relative to the cap.

2. The lace tightening device of claim 1 wherein the stop pin is disposed on a central axis of the swing cover.

3. The lace tightening arrangement of claim 1 wherein the retaining pin is integrally formed with the swing cover or is fixedly attached to the swing cover after being separately formed.

4. The lace tightening device of claim 1 wherein the spool includes a central shaft having an interior cavity, and first and second flanges disposed about the periphery of the central shaft and extending outwardly therefrom, the first and second flanges defining an accommodating space therebetween, the retainer ring being disposed within the interior cavity of the central shaft of the spool.

5. The lace tightening device of claim 4 wherein the interior cavity of the central shaft member includes a stepped wiring module cavity and a position switching module cavity.

6. The lace tightening device of claim 5 wherein the spool further includes a flap for separating the cabling module cavity from the position switch module cavity.

7. The lace tightening device of claim 1 wherein the detachable synchronous rotational connection of the swivel cap to the spool includes one of a snap tooth, a magnetic attraction, a keyed connection.

8. The lace tightening device of claim 4 wherein the screw cap is provided with a first engagement tooth and the spool is provided with a second engagement tooth, the first and second engagement teeth having an engaged and disengaged condition to provide a detachable, synchronized rotational connection of the screw cap to the spool.

9. The lace tightening device of claim 8 wherein the single tooth of the first biting tooth includes a first side and a second side, the first side having an acute angle of not less than 30 ° with respect to a plane in which the bottom surface of the screw cap is located; the single tooth of the second engagement tooth comprises a third side surface and a fourth side surface, and an included angle between the third side surface and a plane where the second flange of the winding reel is located is an acute angle of not less than 30 degrees.

10. The lace tightening device of claim 9 wherein the first side is at an angle of 80±5° to the plane of the bottom surface of the screw cap and the third side is at an angle of 80±5° to the plane of the second flange of the spool.