LACING DEVICE AND ANTI-REVERSE MECHANISM THEREOF

Abstract

A novel lacing device and an anti-reverse mechanism thereof are provided. The lacing device uses a novel swing arm-stop piece-gap mechanism as the anti-reverse mechanism, and the anti-reverse mechanism has double self-locking functions and a reverse deviation limiting function. Three effects are integrated, such that the lacing device using the novel anti-reverse mechanism not only has excellent hand feeling when the lace is tensioned, but also can effectively avoid the accidental loosening of the lace, and has excellent use reliability and durability.

Claims

1. A lacing device, comprising: a rotatable cover, a spool, and a housing, wherein the rotatable cover is rotatably arranged on the housing, and the spool is supported by the housing and rotatable relative to the housing; the rotatable cover is provided with at least one gap; the spool is configured to roll up at least one lace when rotating in a tensioning direction and release the at least one lace when rotating in a loosening direction; the housing is provided with a swing arm elastic component, the swing arm elastic component comprises an elastic member and at least one swing arm arranged along a circumference, and the at least one swing arm is connected to the housing by the elastic member; the at least one swing arm comprises a swing arm head and a swing arm beam, and the swing arm beam extends outward in a radial direction of the circumference, wherein the at least one swing arm is arranged along the circumference; and the at least one swing arm comprises a first side and a second side, wherein the first side and the second side are opposite, the swing arm head is configured to engage the at least one gap of the rotatable cover when the at least one swing arm is in an original position, and the swing arm beam and/or the swing arm head are/is configured to deviate from the original position towards the first side or the second side of the at least one swing arm; the housing is further provided with at least one stop piece, and the at least one stop piece is located on the first side of the at least one swing arm; and the at least one stop piece comprises a wedge-shaped head, and the wedge-shaped head of the at least one stop piece is arranged corresponding to the swing arm head; when the rotatable cover is subjected to an external force in the tensioning direction, the at least one stop piece and the elastic member are configured to allow displacement of the at least one swing arm relative to the at least one tooth gap of the rotatable cover until the swing arm head is disengaged from the at least one tooth gap of the rotatable cover to allow the rotatable cover to rotate in the tensioning direction; and when the rotatable cover is subjected to an external force in the loosening direction, the external force in the loosening direction is configured to cause a side wall of the at least one gap of the rotatable cover to exert bias pressure on the swing arm head to deviate the swing arm head, at least part of the swing arm head abuts against the wedge-shaped head of the at least one stop piece, and the swing arm head always remains engaged with the at least one gap of the rotatable cover to prevent the rotatable cover from rotating in the loosening direction.

2. The lacing device according to claim 1, wherein the at least one stop piece further comprises a base portion, and the base portion of the at least one stop piece is arranged corresponding to the swing arm beam.

3. The lacing device according to claim 2, wherein the swing arm head comprises a tooth portion and a neck portion, at least part of the neck portion of the swing arm head abuts against the wedge-shaped head of the at least one stop piece when the rotatable cover is subjected to the external force in the loosening direction, and the base portion of the at least one stop piece is configured to prevent the swing arm beam from deviating towards a first side of the swing arm beam.

4. The lacing device according to claim 3, wherein the wedge-shaped head of the at least one stop piece comprises a slope surface, the slope surface is adjacent to a first side of the neck portion of the swing arm head, a slope top of the slope surface is inclined to a first side of the wedge-shaped head relative to a slope toe of the slope surface, and the slope toe of the slope surface of the wedge-shaped head is adjacent to the base portion of the at least one stop piece.

5. The lacing device according to claim 3, wherein the swing arm head comprises at least one tooth portion, and when the at least one swing arm is in the original position, the at least one tooth portion of the swing arm head is engaged with the at least one gap of the rotatable cover.

6. The lacing device according to claim 5, wherein the swing arm head comprises two tooth portions.

7. The lacing device according to claim 3, wherein the neck portion of the swing arm head has a first side surface, and the first side surface of the neck portion and a first tooth wall of the tooth portion have an included angle in a range of 60°-120°.

8. The lacing device according to claim 3, wherein the neck portion of the swing arm head has a first side surface, and the first side surface is arranged in parallel with a slope surface of the wedge-shaped head of the at least one stop piece.

9. The lacing device according to claim 7, wherein a first tooth portion is adjacent to the first side surface of the neck portion of the swing arm head, and the first side surface of the neck portion and a first tooth wall of the first tooth portion are perpendicular to each other.

10. The lacing device according to claim 1, wherein the at least one stop piece and the at least one swing arm are arranged separately and in one-to-one correspondence.

11. The lacing device according to claim 1, wherein the elastic member is an elastic base or the elastic member is an elastic ring base composed of at least two elastic bases.

12. The lacing device according to claim 11, wherein the elastic base or each of the at least two elastic bases comprises two connected serpentine elastic elements.

13. The lacing device according to claim 12, wherein the elastic base or the at least two elastic bases and the at least one swing arm are arranged in one-to-one correspondence, and the two connected serpentine elastic elements of the elastic base are arranged in mirror symmetry relative to the swing arm beam of the at least one swing arm.

14. The lacing device according to claim 11, wherein the swing arm elastic component is a retractable swing arm ring, the retractable swing arm ring comprises the elastic ring base and the at least one swing arm connected to the elastic ring base, the at least one swing arm comprises the swing arm head and the swing arm beam, and the at least one swing arm beam extends outward in a radial direction of a circumference of the elastic ring base; and the at least one swing arm is connected to the housing by the elastic ring base.

15. A lacing device, comprising: a rotatable cover, a spool, and a housing, wherein the rotatable cover is rotatably arranged on the housing, and the spool is supported by the housing and rotatable relative to the housing; the housing is provided with at least one gap; the spool is configured to roll up at least one lace when rotating in a tensioning direction and release the at least one lace when rotating in a loosening direction; the rotatable cover is provided with a swing arm elastic component, the swing arm elastic component comprises an elastic member and at least one swing arm arranged along a circumference, and the at least one swing arm is connected to the rotatable cover by the elastic member; the at least one swing arm comprises at least a swing arm head and a swing arm beam, and the swing arm beam extends outward in a radial direction of the circumference, wherein the at least one swing arm is arranged along the circumference; and the at least one swing arm comprises a first side and a second side, wherein the first side and the second side are opposite, the swing arm head is configured to engage the at least one gap of the housing when the at least one swing arm is in an original position, and the swing arm beam and/or the swing arm head are/is configured to deviate from the original position towards the first side or the second side of the at least one swing arm; the rotatable cover is further provided with at least one stop piece, and the at least one stop piece is located on the first side of the at least one swing arm; and the at least one stop piece comprises a wedge-shaped head, and the wedge-shaped head of the at least one stop piece is arranged corresponding to the swing arm head; when the rotatable cover is subjected to an external force in the tensioning direction, the at least one stop piece and the elastic member is configured to allow displacement of the at least one swing arm relative to the at least one gap of the housing until the swing arm head is disengaged from the at least one gap of the housing to allow the rotatable cover to rotate in the tensioning direction; and when the rotatable cover is subjected to an external force in the loosening direction, the external force in the loosening direction is configured to cause a side wall of the at least one gap of the housing to exert bias pressure on the swing arm head to deviate the swing arm head, at least part of the swing arm head abuts against the wedge-shaped head of the at least one stop piece, and the swing arm head always remains engaged with the at least one gap of the housing to prevent the rotatable cover from rotating in the loosening direction.

16. An anti-reverse mechanism for a lacing device, comprising: at least one gap arranged along a circumference; a swing arm elastic component, comprising an elastic member and at least one swing arm arranged along a circumference, wherein the elastic member is connected to the at least one swing arm; the at least one swing arm comprises at least a swing arm head and a swing arm beam, and the swing arm beam extends outward in a radial direction of the circumference, wherein the at least one swing arm is arranged along the circumference; and the at least one swing arm comprises a first side and a second side, wherein the first side and the second side are opposite, the swing arm head is configured to engage the at least one gap when the at least one swing arm is in an original position, and the swing arm beam and/or the swing arm head are/is configured to deviate from the original position towards the first side or the second side of the at least one swing arm; and at least one stop piece, wherein the at least one stop piece is located on the first side of the at least one swing arm, and the at least one stop piece and the at least one swing arm are located on a same part and are arranged separately; and the at least one stop piece comprises a wedge-shaped head and a base portion, the wedge-shaped head of the at least one stop piece is arranged corresponding to the swing arm head, and the base portion of the at least one stop piece is arranged corresponding to the swing arm beam; when the at least one gap is subjected to an external force in the tensioning direction, the at least one stop piece and the elastic member are configured to allow displacement of the at least one swing arm relative to the at least one gap until the swing arm head is disengaged from the at least one gap to allow the at least one gap to rotate in the tensioning direction; and when the at least one gap is subjected to an external force in the loosening direction, the external force in the loosening direction is configured to cause a side wall of the at least one gap to exert bias pressure on the swing arm head to deviate the swing arm head, at least part of the swing arm head abuts against the wedge-shaped head of the at least one stop piece, and the swing arm head always remains engaged with the at least one gap to prevent the at least one gap from rotating in the loosening direction.

17. The anti-reverse mechanism according to claim 16, wherein the at least one gap comprises an open end, and the open end comprises a first end point and a second end point; the at least one gap further comprises a first side wall and a second side wall, the first end point of the open end is at the first side wall, the second end point of the open end is at the second side wall, and the first end point and the second end point of the at least one gap are located on a circumference of the end points of the at least one gap; and a straight line where the second side wall of the at least one gap extends along and a radius through the second end point of the circumference of the end points of the at least one gap have an included angle in a range of 0°-10°.

18. The anti-reverse mechanism according to claim 17, wherein the swing arm head comprises a tooth portion and a neck portion, and when the at least one swing arm is in the original position, the tooth portion of the swing arm head is engaged with the at least one gap.

19. The anti-reverse mechanism according to claim 18, wherein the tooth portion is in a shape the same as that of the at least one gap.

20. The anti-reverse mechanism according to claim 18, wherein the neck portion of the swing arm head is configured in a fan ring shape or a trapezoid shape.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0152] FIG. 1 is an explosion diagram of an embodiment of a lacing device based on a novel swing arm-stop piece-gap mechanism of the present disclosure;

[0153] FIG. 2 is a schematic structural diagram of a retractable swing arm ring in FIG. 1;

[0154] FIG. 3 is a schematic diagram of a combined structure of a housing and the retractable swing arm ring in the lacing device shown in FIG. 1;

[0155] FIG. 4 is an orthographic view of the combined structure of the housing and the retractable swing arm ring in the lacing device shown in FIG. 1;

[0156] FIG. 5A is a top view of a process of a swing arm moving to give way when the lacing device shown in FIG. 1 applies an external force in a tensioning direction (a position where a tooth portion of the swing arm is engaged with a gap);

[0157] FIG. 5B is a partially enlarged view of a position A1 in FIG. 5A;

[0158] FIG. 6A is a top view of the process of the swing arm moving to give way when the lacing device shown in FIG. 1 applies the external force in the tensioning direction (a position in a middle process of the swing arm giving way);

[0159] FIG. 6B is a partially enlarged view of a position A2 in FIG. 6A;

[0160] FIG. 7A is a top view of the process of the swing arm moving to give way when the lacing device shown in FIG. 1 applies the external force in the tensioning direction (a critical position of the swing arm to give way);

[0161] FIG. 7B is a partially enlarged view of a position A3 in FIG. 7A;

[0162] FIG. 8A is a top view of different positions where the swing arm moves to give way when the lacing device shown in FIG. 1 applies the external force in the tensioning direction (a position where the tooth portion of the swing arm is re-engaged with the gap);

[0163] FIG. 8B illustrates a partially enlarged view of a position A4 in FIG. 8A;

[0164] FIG. 9A is a top view of the swing arm-stop piece-gap mechanism when the lacing device shown in FIG. 1 applies an external force in a loosening direction;

[0165] FIG. 9B is a partially enlarged view and a force analysis diagram of a position C2 in FIG. 9A;

[0166] FIG. 10A is a schematic structural diagram of a swing arm and a gap in an original position in a comparative example of the embodiment shown in FIG. 1;

[0167] FIG. 10B is a partially enlarged view of a position E in FIG. 10A;

[0168] FIG. 11A is a schematic diagram of anti-reverse failure of a swing arm-stop piece mechanism in the comparative example shown in FIG. 10a;

[0169] FIG. 11B is a partially enlarged view of a position E1 in FIG. 11A;

[0170] FIG. 12A is a top view of a middle position where the swing arm moves in an opposite direction to give way after removing a stop piece in the embodiment shown in FIG. 1;

[0171] FIG. 12B is a partially enlarged view of a position D2 in FIG. 12A;

[0172] FIG. 13 is a schematic diagram of another embodiment of the swing arm in the lacing device;

[0173] FIG. 14A is a top view of a middle position where a swing arm moves to give way when an external force is applied in a tensioning direction of another embodiment of the lacing device;

[0174] FIG. 14B is a partially enlarged view of a position B1 in FIG. 14A;

[0175] FIG. 15A is a top view of a swing arm-stop piece-gap mechanism when the lacing device shown in FIG. 14A applies an external force in a loosening direction; and

[0176] FIG. 15B is a partially enlarged view and a force analysis diagram of a position B2 in FIG. 15A.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0177] The present disclosure will be further described below with reference to the accompanying drawings and embodiments, in which the same or similar reference numerals represent the same or similar components or components with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are only used to explain the present disclosure but should not be construed as a limitation to the present disclosure.

[0178] It should be understood that the terms “upper”, “lower”, “left”, “right”, “front”, “rear”, “length”, “width”, “horizontal”, “vertical”, “top”, “bottom”, “inside”, and “outside” used in the expressions of the present disclosure to indicate an orientation or positional relationship are all based on the orientation or positional relationship shown in the accompanying drawings, which are intended to facilitate the description of the present disclosure and simplify the description, and cannot be understood as a limitation that the referred device or component must have a specific orientation or a specific positional relationship.

[0179] In addition, the terms “first” and “second” are only used for the purpose of discriminative description, and have no connotation of relative importance, nor do they indicate or imply the number of technical features. Thus, a feature defined with “first” or “second” may expressly or implicitly that there are one or more features including that feature. In the description of the present disclosure, “a plurality of” means two or more, unless otherwise specifically defined.

[0180] Unless otherwise specified, terms such as “connection” and “fixed” in the present disclosure should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral forming; it may be a direct connection, or an indirect connection through an intermediate medium. Those of ordinary skill in the art may understand specific meanings of the foregoing terms in the present disclosure based on a specific situation.

[0181] A novel unidirectional anti-reverse mechanism based on the swing arm-stop piece-gap and a novel lacing device including the same in the present disclosure will be described in detail below with reference to the accompanying drawings and specific embodiments.

Embodiment 1

[0182] As shown in 1, a novel lacing device includes a base 1, a spool component A, a housing 4, a retractable swing arm ring 5, and a rotatable cover 6. The base 1 may be fixedly arranged on the upper, tongue, clothes, hats, or bags. A top end face of the housing 4 is fixedly connected to the swing arm ring 5 through a snap structure 42. The spool component A includes an elastic stop pin 2 and a spool 3. For the structure of the spool component A and a connection method with the rotatable cover 6, reference may be made to the content of the patent document CN202121933315.3.

[0183] As shown in FIG. 2, the retractable swing arm ring 5 includes a centrally arranged retractable elastic ring base 51 and one or more swing arms 52 arranged along a circumference. The swing arm 52 includes a swing arm head 521 and a swing arm beam 522. In the present embodiment, three swing arms are arranged, the three swing arms are arranged at equal intervals, and each swing arm beam 522 extends radially along the circumference of the elastic ring base. As shown in the figure, the swing arm head 521 includes two tooth portions 5211 and 5212 and a neck portion 5213, and the shape of each tooth portion 5211 and 5212 is the same as that of the gap on the rotatable cover (see 6511 and 6512 in FIG. 5B), which is angular, and the tooth portion can be engaged with or separated from the gap on the rotatable cover 6. The overall shape of the neck portion 5213 and the swing arm beam 522 is similar to the shape of an axe. The elastic ring base 51 includes three elastic bases 511. Each elastic base 511 is formed by connecting a first serpentine elastic element 5111 and a second serpentine elastic element 5112. The first serpentine elastic element 5111 and the second serpentine elastic element 5112 are arranged on both sides of each swing arm 52 respectively and in mirror symmetry relative to the swing arm beam 522. A main elastic force direction of the two serpentine elastic elements 5111 and 5112 are approximately in a radial direction of the circumference. Tails W1 and W2 of the two serpentine elastic elements 5111 and 5112 are connected to form a waveform structure of an elastic portion E that projects radially outward. The tail 523 of the swing arm 52 is arranged at a peak position of the waveform structure of the elastic portion E, and a connection position is similar to an inverted Y-shaped structure. The spread angle of the waveform structure of the elastic portion E is 120°. Heads H1 and H2 of the two serpentine elastic elements (which are also a head H1 and a tail H2 of the elastic base) are relatively far apart, and are separately fixed on the housing 4. Three elastic bases are connected end to end to form a retractable elastic ring base 51 of a closed-loop structure, and the elastic ring base 51 is integrally formed. An end-to-end connection area of the elastic bases protrudes radially outward to form a waveform structure of a fixing portion S. A snap structure 512 is arranged near the wave peak of the waveform structure of the fixing portion S. A corresponding snap groove 42 is arranged on the housing (see FIG. 3 for details) to fix the retractable elastic ring base 51 on the housing 4. Because the waveform structure of an elastic portion E protrudes radially outward, when the wave peak position of the waveform structure is subjected to radial inward pressure, its deformation ability is very strong.

[0184] FIG. 3 is a schematic diagram of a combined structure of a housing and the retractable swing arm ring. As shown in FIG. 3, the housing 4 includes an annular platform 43. A center of the annular platform is a through hole for the elastic stop pin 2 to pass through, and engaging teeth of the end face of the spool 3 are exposed to be meshed with engaging teeth of the rotatable cover. The end face of the annular platform 43 is integrally formed with one or more stop pieces 44 near an outer periphery. The stop piece 44 and the swing arm 52 are arranged in one-to-one correspondence, and are arranged adjacent to the same side of the swing arm 52 (a clockwise side or a counterclockwise side, in the present embodiment, it is the counterclockwise side (also called a first side)). The stop piece 44 includes a wedge-shaped head 441 and a base portion 442. The wedge-shaped head 441 of the stop piece is arranged corresponding to the swing arm head 521. The base portion 442 of the stop piece is arranged corresponding to the swing arm beam 522. As shown in FIG. 4, a first tooth wall TS1 of each tooth portion is perpendicular to a first side surface NS1 of the neck portion)(α=90°, and a slope surface 4411 of the wedge-shaped head 441 of the stop piece is parallel to the first side surface NS1 of the neck portion. In other preferred embodiments, the included angle α between the first tooth wall TS1 of each tooth portion 5211 and the first side surface of the neck portion 5213 can also be set to other angles in a range of 60°-120°, as long as the first side surface NS1 is always located on the first side (counterclockwise side) in the radial direction of the swing arm and is inclined in the counterclockwise direction (which can be combined with the description of FIG. 5B). The stop piece 44 is configured to prevent the swing arm 52 from moving in the counterclockwise direction (the first side direction), thereby preventing the rotatable cover from rotating in the counterclockwise direction. The clockwise direction of the lacing device using the novel stop piece-retractable swing arm ring structure is the direction of tensioning the lace, such that the arrangement of the stop piece 44 can prevent the rotatable cover and the spool from rotating in the counterclockwise direction under the action of the external force in the loosening direction, thereby preventing the lace from being accidentally disengaged in the tensioning state. The housing 4 is also provided with a ring of buckle protrusions 41, an inner wall of a cavity of the corresponding rotatable cover 6 has at least one buckle position (hidden in the figure), and the rotatable cover 6 is pressed and buckled on the outer periphery of the housing to form a whole locking structure of the lacing device.

[0185] When the lacing device is assembled, the end face of the annular platform 43 of the housing 4 and the snap of the retractable swing arm ring 5 are fixed, and then the rotatable cover 6 is fixed with the engaging teeth and then pressed and buckled on the housing 4. Then, the spool component A is loaded into the housing 4 from the bottom of the housing 4 (the housing 4 has an inner cavity). One end of the elastic stop pin passes through a central through hole of the housing 4. Finally, the lace is threaded, and the housing 4 is fixed with the base 1, and the lacing device is assembled.

[0186] When the lacing device is in use, the rotatable cover 6 is pressed down hard, and a “click” sound can be heard, such that the engaging teeth on the rotatable cover 6 is meshed with the engaging teeth on the spool 3, and the rotatable cover 6 can rotate to drive the spool 3 to rotate together at this time. The rotatable cover 6 is rotated in the tensioning direction, and a crisp “click” sound can be heard. At this time, the tooth portion 5211 of the swing arm head is engaged with the gap on the rotatable cover, and the engaging teeth on the rotatable cover and the end face of the spool are meshed. The rotatable cover 6 drives the spool 3 to rotate in the tensioning direction, and the lace is wound in the channel of the spool 3 round by round. The item to be laced is slowly tensioned by the lace until tightness is suitable. If the lace is too tight, the rotatable cover 6 can be pulled up, and the engaging teeth on the rotatable cover and the end face of the spool are disengaged. At this time, the tight lace will reverse the spool to loosen the item. Then the rotatable cover 6 is pressed down, the previous tensioning action is repeated, and the tightness of the item to be laced is adjusted to a suitable level.

[0187] With reference to FIG. 5A to FIG. 8B, in the present embodiment, when the rotatable cover is rotated in the tensioning direction (clockwise direction), the swing arm moves to give way in the following process: as shown in FIG. 5B, at a position A1, the tooth portions 5211 and 5212 of the swing arm are engaged with the gaps 6511 and 6512 of the rotatable cover, as shown in FIG. 5A and FIG. 5B, teeth are provided along a circumference of the rotatable cover, the gaps 6511 and 6512 are formed by the space between adjacent teeth, and the swing arm is in a state of natural extension. At this time, the radial direction of the swing arm is R.sub.0 (in the present embodiment, the R.sub.0 direction is set as a vertical direction). The first side surface of the swing arm neck is located on a first side of the radial direction R.sub.0 of the swing arm, and its top T0 is inclined to the first side of the swing arm compared to its bottom B0. The first side surface and the radial direction R.sub.0 of the swing arm has an included angle β=30°. In other embodiments, the included angle θ may be other acute angles. When the rotatable cover is rotated in the clockwise direction, the gap is subjected to a clockwise rotating force. Taking one tooth portion-gap pair as an example, a first side wall BL1 of the gap 6512 extrudes the tooth portion 5212 of the swing arm, forcing the swing arm head and the swing arm beam 522 to be deviated to give way in the direction of an extrusion force F1. The extrusion force F1 is perpendicular to the side wall BL1, and is also parallel to the slope surface 4411 of the wedge-shaped head 441 of the stop piece. Therefore, under the action of the extrusion force F1, the moving tendency of the swing arm head is parallel or nearly parallel to the slope surface 4411 of the wedge-shaped head of the stop piece. Therefore, the wedge-shaped head of the stop piece will not hinder the displacement of the swing arm head in this direction, and at the same time, part of the extrusion force applied by the side wall BL1 of the gap 6512 to the swing arm tooth 5212 is transmitted to the elastic base 511 connected therewith along the swing arm beam 522 and forces the elastic base 511 to elastically deform, so as to further drive the swing arm beam to move radially inward. Thus, the first side wall TS1 of the tooth portion 5212 of the swing arm can slide in the direction of A1 to A2 along the first side wall BL1 of the gap 6512. The rotating force is continuously applied, the tooth portion 5212 of the swing arm slides to a first end point DD1 of the gap along the first side wall BL1 of the gap, and at this time, the swing arm is inclined to give away to the maximum extent and reaches a critical position A3, which is unstable. Under the restoring elastic force of the swing arm and the elastic base 511, the tooth portion 5212 of the swing arm is quickly engaged with the next gap 6513, and reaches a position A4 for re-engagement. At this time, the gap is advanced one step in the clockwise direction. The previous tensioning action is repeated to realize the rotation of the rotatable cover and the spool round and round.

[0188] In combination with FIG. 9A and FIG. 9B, in the present embodiment, a second side wall BL2 of the gap exerts bias pressure on the swing arm tooth when the rotatable cover is rotated in the loosening direction (counterclockwise direction). As shown in the figure, the two tooth portions of the swing arm are separately subjected to a biasing force F2. The biasing force F2 includes a counterclockwise circumferential component force F21 and an upward radial component force F22. Under the action of the circumferential component force F21, the swing arm head is inclined in the counterclockwise direction, such that the first side surface NS1 of the neck portion 5213 of the swing arm abuts against the slope surface 4411 of the wedge-shaped head of the stop piece, the swing arm beam partially abuts against the base portion of the stop piece, the slope surface 4411 applies an oblique upward extrusion force P1 to the neck portion 5212, and the base portion of the stop piece applies a transverse extrusion force P2 to the swing arm beam. The extrusion force P1 is in a direction basically the same as that of the first side wall of the swing arm tooth, and has an upward radial component force P12 and a circumferential component force P11. The circumferential component force P11 can partially deviate the circumferential component force of the biasing force F2. A combined force of the extrusion force P1 and the biasing force F2 makes the swing arm tooth push up against the gap of the rotatable cover, that is, the extrusion force applied by the stop piece to the swing arm forms a first self-locking force for engagement of the swing arm tooth with the gap of the rotatable cover. At the same time, the extrusion force P2 applied by the base portion of the stop piece to the swing arm beam is basically a circumferential force, which can restrict the swing arm from swinging to the side in the counterclockwise direction. The radial direction of the radial component force of the biasing force F2 received by each tooth portion corresponds to a radial direction R1 or R2 where a second end point DD2 of each tooth portion is located separately. The radial direction of the radial component force of the extrusion force P1 applied by the slope surface 4411 to the neck portion 5212 refers to the R.sub.0 direction in FIG. 5B. In the description of the present embodiment, the same structure is marked with the same reference numeral. If there is no corresponding reference numeral in a single figure, reference may be made to the figure with the corresponding structure reference numeral.

[0189] On the other hand, a straight line BL2 of the second side walls of any two adjacent gaps and radii R1/R2 corresponding to their respective second end points DD2 have an included angle θ=10° separately. Therefore, the biasing force F2 applied by the second side wall BL2 of the gap to the swing arm tooth will have an upward radial component force F22 in the direction of the radius R1 or R2 where the second end point DD2 is located. The upward radial component force also makes the swing arm tooth push against the side wall of the gap to form a second self-locking force for engagement of the swing arm tooth with the gap of the rotatable cover. In this way, the double self-locking forces and the reverse swing limit are integrated, which greatly enhances the anti-reverse performance of the lacing device. A single stop piece can achieve an anti-reverse effect superior than that of the structure with two stop pieces corresponding to one swing arm. The design is ingenious and the anti-reverse effect is remarkable.

[0190] In the comparative example of the swing arm-stop piece-gap mechanism shown in FIG. 10A and FIG. 10B, the structures of the gap and the elastic base are exactly the same, and thus are marked with the same reference numerals. The difference lies in the structural design of the swing arm and the stop piece. More specifically, as shown in FIG. 10B, in this comparative example, the swing arm head only includes a tooth portion without a neck portion, and includes only one tooth portion 5212′. The structure of a single tooth portion is the same as that of Embodiment 1, and the stop piece 44′ is not provided with a wedge-shaped head. Only the base portion is arranged adjacent to the swing arm beam 522, and the structure of the swing arm beam 522 is the same as that of Embodiment 1.

[0191] When the rotatable cover is rotated in counterclockwise direction, the second side wall BL2 of the gap 6512 applies an extrusion force to the second tooth wall TS2′ of the swing arm tooth 5212′. Although the extrusion force has a radially outward component force, this component force is very small, most of which are circumferential component forces. When the applied external force in the loosening direction is small, the swing arm cannot move away from the gap due to the obstruction of the stop piece 44′, so the rotatable cover cannot rotate in the clockwise direction. With reference to FIG. 11B, after the applied external force in the loosening direction exceeds a certain threshold, the circumferential component force of the external force in the loosening direction forces the swing arm to be deviation. At this time, the swing arm abuts against the stop piece. A contact point of the stop piece and the swing arm constitutes a fulcrum P of the lever, which further increases the external force in the loosening direction. The first side wall BL1 of the gap will also apply a certain extrusion force to the swing arm tooth, and the extrusion force has a radially inward component force. With the continuous increase of the external force in the loosening direction, the radially inward component force of the extrusion force is transmitted to the elastic base 511. Due to the strong deformation ability of the elastic base, elastic deformation will occur even when the radially inward force is small. Therefore, the contact between the swing arm tooth and the second side wall of the gap gradually changes into a point contact, and the extrusion force applied by the gap of the rotatable cover to the swing arm tooth is equivalent to the external pressure on one end of the lever. According to the lever principle, under the action of the force and the characteristics of easy deformation of the elastic base, the tail of the swing arm will tilt up. With the increase of the tilt degree of the tail, the hindering effect of the stop piece on the swing arm gradually decreases. The swing arm tooth is gradually disengaged from the gap until a critical position shown in FIG. 11B, and only the apex of the tooth portion 5212′ is in contact with the first end point DD1 of the gap 6512. In this process, the position of the contact point P between the stop piece and the swing arm (equivalent to the fulcrum of a lever) on the swing arm may change continuously with the deviation displacement of the swing arm. Since the critical position is unstable, under the restoring elastic force of the swing arm and the elastic base 511, the tooth portion 5212′ of the swing arm is quickly engaged with the next gap 6511 to achieve re-engagement. At this time, the gap is advanced one step in the counterclockwise direction. By continuously applying a large external force in the loosening direction, the rotatable cover and the spool can rotate in the counterclockwise direction round and round. The lacing device loses its anti-reverse function. Therefore, in the comparative example, the structural arrangement of the stop piece and the swing arm head cannot prevent the accidental loosening of the lace under a large external force in the loosening direction (an external force in the loosening direction exceeding a certain threshold), because when the external force in the loosening direction exceeds a certain threshold, the swing arm-stop piece-gap mechanism loses the anti-reverse function. Therefore, in special situations outdoors, the external force in the loosening direction is unexpectedly increased, and the lace is at risk of loosening. Therefore, although the characteristics of easy deformation of the elastic base 511 have an excellent effect on the improvement of the hand feeling when tensioning the lace, the corresponding risk of lace loosening also increases. The swing arm-stop piece-gap mechanism used by the comparative example only has the upward self-locking effect of the swing arm tooth and the gap and the anti-deflection effect of the base portion of the stop piece. This double effect can only be used for a small external force in the loosening direction. When the external force in the loosening direction exceeds a certain threshold, the anti-reverse effect is lost, so a lacing device using this mechanism can only have the effect of preventing the lacing from loosening for a small external force in the loosening direction.

[0192] FIG. 12A and FIG. 12B are a top view and a partially enlarged view of a middle position D2 where the swing arm moves in an opposite direction to give way after removing a stop piece in the embodiment shown in FIG. 1. It can be seen from FIG. 5A to FIG. 8B, FIG. 12A, and FIG. 12B that the swing arm structure provided by the present disclosure can move to give way bidirectionally without a stop piece, and the deviation of the swing arm to both sides is not only the deviation of the swing arm beam 522 itself. The elastic deformation of the elastic base 511 also plays an important role. The excellent deformation ability of the elastic base 511 reduces the difficulty of the deviation of the swing arm and is conducive to improving the hand feeling of the user. The movement and displacement of the swing arm not only is the deviation of the swing arm to both sides, but also includes the radially inward movement and displacement of the swing arm. The realization mechanism of the radially inward movement of the swing arm depends on the elasticity of the elastic base. In the present embodiment, the elastic base can not only extend and retract in the radial direction, but also locally twist in the circumferential direction, so as to drive the swing arm to move radially inward and to be deviated to both sides at the same time.

[0193] In other preferred embodiments, the swing arm head may only include one tooth portion 5211′, as shown in FIG. 13. Compared with the swing arm head with two tooth portions, the anti-reverse effect of the two tooth portions is more excellent.

[0194] In other preferred embodiments, the counterclockwise direction can also be set as the direction of tensioning the lace, and the clockwise direction can be set as the direction of loosening the lacing. At this time, the stop piece should prevent the swing arm from swinging in the clockwise direction. Therefore, it is necessary to reasonably arrange the arrangement position of the stop piece according to the actual situation.

Embodiment 2

[0195] The structure of the present embodiment is basically the same as that of Embodiment 1. The only difference is that the arrangement positions of the swing arm-stop piece and the gap are exchanged, that is, in the present embodiment, a swing arm X52-stop piece X44 mechanism is arranged on the rotatable cover, and the gaps K6511 and K6512 are arranged on the housing. In actual use, the swing arm X52-stop piece X44 mechanism rotates with the rotatable cover. The gaps K6511 and K6512 are stationary, and the side walls of the gaps K6511 and K6512 generate resistance to the movement of the swing arm tooth, which makes the swing arm bend and deform to swing and give way. As shown in FIG. 14B, the clockwise direction indicated by the arrow is the direction of tensioning the lace. When the external force is applied to the rotatable cover in the clockwise direction, the side wall of the gap applies reverse resistance F3 to the swing arm tooth to force the swing arm X52 (swing arm head and/or swing arm beam) to be deviated in the counterclockwise direction. The stop piece X44 is located in the clockwise direction of the swing arm, so the stop piece X44 allows the swing arm X52 (swing arm head and/or swing arm beam) to be deviated in the counterclockwise direction to give way, and the rotatable cover can rotate in the clockwise direction. As shown in FIG. 15B, when a counterclockwise rotating force is applied to the rotatable cover, the swing arm X52 tries to rotate in the counterclockwise direction, and the other side walls of the gaps K6511 and K6512 apply reverse resistance F4 to the swing arm tooth to force the swing arm to be deviated in the clockwise direction. However, since the stop piece X44 is located in the clockwise direction of the swing arm X52, the base portion X442 of the stop piece prevents the swing arm beam X522 from deviating in the clockwise direction, and only the swing arm head can be slightly deviated in the clockwise direction until its neck portion X5213 abuts against the wedge-shaped head X441 of the stop piece. The slope surface of the wedge-shaped head X441 applies an oblique upward extrusion force P3 to the swing arm neck X5213. P3 includes an upward component force P31. The component force P31 keeps the swing arm tooth always engaged with the gap, so the swing arm tooth cannot be disengaged from the gap, and the rotatable cover cannot rotate in the reverse direction. The counterclockwise direction is the anti-reverse direction.

[0196] The difference between the present embodiment and Embodiment 1 is that in the present embodiment, the rotatable direction of the rotatable cover is opposite to that of the swing arm, while in Embodiment 1, the direction in which the swing arm can swing and give way is the same as the rotatable direction of the rotatable cover. The reason for this difference is related to which of the gap and the swing arm is arranged on the driving part, because the force forcing the lateral deviation of the swing arm comes from the pressure of the side wall of the gap on the swing arm tooth. When the gap is arranged on the driving part, the pressure is basically the same as the applied external force, so the deviation direction of the swing arm is the same as the rotatable direction. When the swing arm is arranged on the driving part, the pressure is a reverse force, so the deviation direction of the swing arm is opposite to the rotatable direction.

[0197] The descriptions of the first side and the second side of the swing arm and the gap in the present disclosure are consistent. The orientation is based on the assembled state of the rotatable cover and the housing. In other words, the orientation of the actual use state of the swing arm-gap structure is used as the reference. The first side of the gap corresponds to the first side of the swing arm, and the second side of the gap corresponds to the second side of the swing arm. For example: if the left side of the swing arm is identified as the first side, the right side of the swing arm can be identified as the second side.

[0198] In other preferred embodiments, three retractable swing arms can also be arranged at intervals, and each retractable swing arm is individually fixed to the housing or the rotatable cover. An excellent anti-reverse effect can also be achieved.

[0199] The above descriptions are only preferred embodiments of the present disclosure, which are further detailed descriptions of the present disclosure in conjunction with specific preferred embodiments, and it cannot be considered that the specific implementation of the present disclosure is limited to these descriptions. Any modifications, equivalents, improvements, etc. made within the spirit and principle of the present disclosure shall all fall within the protection scope of the present disclosure.