FASTENING DEVICE

Abstract

A fastening device includes a case unit including an inner space, a spool received within the inner space and configured for a lace to be wound thereabout, an engaging unit disposed above the spool along an axis, a torque unit disposed above the engaging unit along the axis and including at least one torque portion, and a knob covering the case unit. As a rotation of the knob in a tensioning direction causes the torque unit to drive the engaging unit for allowing the knob to drive the spool, the spool is rotated in the tensioning direction to tension the lace, and as a force born by the at least one torque portion exceeds a threshold, the spool is not rotated in the tensioning direction.

Description

BACKGROUND

Technical Field

The present disclosure relates to a fastening device. More particularly, the present disclosure relates to a fastening device for securing an article through loosening or tightening a lace.

Description of Related Art

In daily life, cords, such as a lace or a thread, are usually used to tighten articles. The most common tightening method is to use the cord to reciprocately pass through holes on the article, e.g., eyelets of a shoe, and then tie a knot to secure the article. But in this kind of tightening method, the knot is loosened easily owing to an external force. Not only does the knot need to be tied again, but also lots of inconveniences come owing to the insecurity of the articles.

In order to solve such problems, some practitioners developed a simple fastening mechanism including a case, an engaging unit and a spring. The case includes holes configured for the lace to pass therethrough. Through the reaction force between the spring and the engaging unit, the lace can be clamped between the engaging unit and the case so as to be fastened. The length of the lace can be changed by pressing the spring to change the position of the engaging unit. However, in such fastening mechanism, the restoring force of the spring is served as the securing force; thus, the lace is easily to be released owing to vibrations or an external force. In addition, the fastening mechanism has no space for receiving the lace, and the exposure of the lace may bring danger.

Therefore, some practitioners developed another kind of buckle which can be rotated to tighten the lace, and the lace can be received inside the buckle. Through the interference between components inside the buckle, the length of the lace as well as the tightness can be adjusted. However, in a status that the lace is under tensioned, if the buckle keeps operating to increase the tension, the tension born by the lace may exceed the capacity thereof, and the lace may be broken or the article may be damaged.

Based on the above-mentioned problems, how to solve the problems becomes a target that those in the field pursue.

SUMMARY

According to one aspect of the present disclosure, a fastening device includes a case unit including an inner space, a spool received within the inner space and configured for a lace to be wound thereabout, an engaging unit disposed above the spool along an axis, a torque unit disposed above the engaging unit along the axis and including at least one torque portion, and a knob covering the case unit. As a rotation of the knob in a tensioning direction causes the torque unit to drive the engaging unit for allowing the knob to drive the spool, the spool is rotated in the tensioning direction to tension the lace, and as a force born by the at least one torque portion exceeds a threshold, the spool is not rotated in the tensioning direction.

According to another aspect of the present disclosure, a fastening device includes a case unit including an inner space and a plurality of engaging teeth, a spool received within the inner space and configured for a lace to be wound thereabout, a knob covering the case unit, at least one pawl arm received in the inner space and corresponding to at least one of the engaging teeth, and at least one torque portion received in the inner space and being rotably connected to one of the knob and the at least one pawl arm. As a rotation of the knob in a tensioning direction causes the at least one pawl arm to rotate, the spool is rotated in the tensioning direction to tension the lace, and as the lace is over tensioned, the at least one torque portion prohibits the spool from rotating in the tensioning direction.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows:

FIG. 1 shows a three-dimensional schematic view of a fastening device according to a first embodiment of the present disclosure.

FIG. 2 shows one exploded view of the fastening device of the first embodiment of FIG. 1.

FIG. 3 shows another exploded view of the fastening device of the first embodiment of FIG. 1.

FIG. 4 shows one cross-sectional side view of the fastening device of the first embodiment of FIG. 1.

FIG. 5 shows another cross-sectional side view of the fastening device of the first embodiment of FIG. 1.

FIG. 6 shows a cross-sectional top view of the fastening device of the first embodiment of FIG. 4 taken along line 6-6.

FIG. 7 shows a three-dimensional schematic view of a fastening device according to a second embodiment of the present disclosure.

FIG. 8 shows one exploded view of the fastening device of the second embodiment of FIG. 7.

FIG. 9 shows another exploded view of the fastening device of the second embodiment of FIG. 7.

FIG. 10 shows one cross-sectional side view of the fastening device of the second embodiment of FIG. 7.

FIG. 11 shows another cross-sectional side view of the fastening device of the second embodiment of FIG. 7.

FIG. 12 shows a cross-sectional top view of the fastening device of the second embodiment of FIG. 10 taken along line 12-12.

FIG. 13 shows a three-dimensional schematic view of a fastening device according to a third embodiment of the present disclosure.

FIG. 14 shows one exploded view of the fastening device of the third embodiment of FIG. 13.

FIG. 15 shows another exploded view of the fastening device of the third embodiment of FIG. 13.

FIG. 16 shows one cross-sectional side view of the fastening device of the third embodiment of FIG. 13.

FIG. 17 shows another cross-sectional side view of the fastening device of the third embodiment of FIG. 13.

FIG. 18 shows a cross-sectional top view of the fastening device of the third embodiment of FIG. 16 taken along line 18-18.

FIG. 19 shows a three-dimensional schematic view of a fastening device according to a fourth embodiment of the present disclosure.

FIG. 20 shows one exploded view of the fastening device of the fourth embodiment of FIG. 19.

FIG. 21 shows another exploded view of the fastening device of the fourth embodiment of FIG. 19.

FIG. 22 shows one cross-sectional side view of the fastening device of the fourth embodiment of FIG. 19.

FIG. 23 shows another cross-sectional side view of the fastening device of the fourth embodiment of FIG. 19.

FIG. 24 shows a cross-sectional top view of the fastening device of the fourth embodiment of FIG. 22 taken along line 24-24.

FIG. 25 shows a three-dimensional schematic view of a fastening device according to a fifth embodiment of the present disclosure.

FIG. 26 shows one exploded view of the fastening device of the fifth embodiment of FIG. 25.

FIG. 27 shows another exploded view of the fastening device of the fifth embodiment of FIG. 25.

FIG. 28 shows one cross-sectional side view of the fastening device of the fifth embodiment of FIG. 25.

FIG. 29 shows another cross-sectional side view of the fastening device of the fourth embodiment of FIG. 25.

DETAILED DESCRIPTION

The embodiments of the present disclosure will be illustrated with drawings hereinafter. In order to clearly describe the content, many practical details will be mentioned with the description hereinafter. However, it will be understood by the reader that the practical details will not limit the present disclosure. In other words, in some embodiment of the present disclosure, the practical details are not necessary. Additionally, in order to simplify the drawings, some conventional structures and elements will be illustrated in the drawings in a simple way; the repeated elements may be labeled by the same or similar reference numerals.

In addition, the terms first, second, third, etc. are used herein to describe various elements or components, these elements or components should not be limited by these terms. Consequently, a first element or component discussed below could be termed a second element or component. Moreover, the combinations of the elements, the components, the mechanisms and the modules are not well-known, ordinary or conventional combinations, and whether the combinations can be easily completed by the one skilled in the art cannot be judged based on whether the elements, the components, the mechanisms or the module themselves are well-known, ordinary or conventional.

FIG. 1 shows a three-dimensional schematic view of a fastening device 100 according to a first embodiment of the present disclosure. FIG. 2 shows one exploded view of the fastening device 100 of the first embodiment of FIG. 1. FIG. 3 shows another exploded view of the fastening device 100 of the first embodiment of FIG. 1. The fastening device 100 includes a case unit 200, a spool 300, an engaging unit 400, a knob 500 and a torque unit 800.

The case unit 200 includes an inner space. The spool 300 is received within the inner space and is configured for a lace to be wound thereabout. The engaging unit 400 is located above the spool 300 along an axis 11 (shown in FIG. 4). The knob 500 is located above the engaging unit 400 along the axis 11. The torque unit 800 is rotably connected to one of the knob 500 and the engaging unit 400, and the torque unit 800 selectively transmits a rotating force to the spool 300. As the knob 500 is rotated in a tensioning direction A1, the knob 500 drives the engaging unit 400 to rotate the spool 300 in the tensioning direction A1 for tensioning the lace. As the lace is over tensioned, the spool 300 is not rotated in the tensioning direction A1.

Therefore, as the lace is over tensioned, a user cannot rotate the spool 300 by the knob 500, and over tightening of the lace can be prevented. Details of the fastening device 100 may be described hereinafter.

The case unit 200 of the fastening device 100 may include a housing 210, a base 220, a partition 230, a plurality of engaging teeth 240, a central hole 250 and a plurality of inner teeth 260. The housing 210 defines the inner space and includes an upper opening and a lower opening, and the upper opening and the lower opening are communicated with the inner space. The base 220 is detachably connected to the housing 210 to close the lower opening by engagement, but the present disclosure is not limited thereto.

The partition 230 may protrude inward from the housing 210 to separate the inner space into an upper chamber and a lower chamber. The engaging teeth 240 are located at the housing 210 and are in the upper chamber, and the inner teeth 260 are located at the housing 210 and are in the lower chamber. The central hole 250 may penetrate the partition 230 to allow the upper chamber to be communicated with the lower chamber. The spool 300 may be received in the lower chamber.

The spool 300 may include a spool shaft body, an upper ring portion 310, a lower ring portion 320, a plurality of pivoting shafts, a spool hole and a flexible clamping portion 330. The upper ring portion 310 extends radially and outward from an upper end of the spool shaft body, the lower ring portion 320 extends radially and outward from a lower end of the spool shaft body, and a track is formed between the upper ring portion 310 and the lower ring portion 320 for the lace to be wound thereabout. The pivoting shafts are disposed at an upper surface of the spool shaft body. The spool hole penetrates the spool shaft body to form a spool inner surface. The flexible clamping portion 330 may include two clamping arms extend downward from the spool inner surface to form a clamping space for coupling a connecting unit of the fastening device 100, and the details thereof may be described hereinafter.

The engaging unit 400 may include an engaging disc 410, three pawl arms 430, three stopping portions 450 and a plurality of driving teeth 460. The engaging disc 410 is a hollow circle and includes a central through hole. Each of the pawl arms 430 extends outward from the engaging disc 410 and has a cantilever structure which may be deflected inward as being forced. Each of the stopping portions 450 extends outward from the engaging disc 410 and corresponds to a distal end of each of the pawl arms 430. As each of the pawl arms 430 is forced to be deflected inward, each of the stopping portions 450 may stop each of the pawl arms 430, thereby increasing the capability of prohibiting the spool 300 from rotating reversely. The driving teeth 460 may be disposed at a lower end of the engaging disc 410 to come near the spool 300.

The fastening device 100 may further include a transmission set 700 coupling to the driving teeth 460 of the engaging unit 400 and the spool 300. Precisely, the transmission set 700 may include a sun gear 710, a plurality of planet gears 730 and a plate 720. The sun gear 710 is driven by the driving teeth 460 of the engaging unit 400. Each of the planet gears 730 is pivotally disposed at each of the pivoting shafts of the spool 300 to engage with the sun gear 710 and the inner teeth 260 of the case unit 200. The plate 720 is placed above the planet gears 730 to cover the planet gears 730.

As shown in FIG. 2, the engaging unit 400 may further include a boss 420 and at least one engaging portion 440 along the axis 11, the boss 420 is integrally connected to the engaging disc 410, and the at least one engaging portion 440 is disposed at the boss 420. In the first embodiment, a number of the at least one engaging portion 440 is three, and each of the engaging portion 440 has a radial groove structure, but the present disclosure is not limited thereto.

The torque unit 800 may include a torque disc 820, at least one coupling portion 830 and at least one torque portion 810. A number of the at least one coupling portion 830 is three. The three coupling portions 830 are disposed with intervals at an inner edge of the torque disc 820, each of the coupling portions 830 may be engaged with each of the engaging portions 440, and each of the coupling portions 830 may have a bump structure extending radially and inward. The coupling portions 830 and the at least one torque portion 810 may be staggered along a radial direction. Specially, a number of the at least one torque portion 810 is also three and the three torque portions 810 are disposed with intervals at an outer edge of the torque disc 820. Moreover, one of the torque portions 810 is located between two of the coupling portions 830, and each of the torque portions 810 may have a triangular bump structure and include a forced inclined surface 811 (labeled in FIG. 6) for increasing the structural stability.

As assembling, the torque unit 800 may sleeve on the boss 420 of the engaging unit 400, each of the coupling portions 830 having the bump structure may coordinate with each of the engaging portions 440 having the groove structure, thereby rotably connecting the torque unit 800 to the engaging unit 400, but the combination method is not limited thereto. In addition, after the torque unit 800 and the engaging unit 400 are assembled, a deforming space S1 (labeled in FIG. 6) is formed between at least one portion of the torque unit 800 and the boss 420. Therefore, as a force born by the torque unit 800, especially born by each of the torque portions 810, exceeds a threshold, the at least one portion of the torque unit 800 is deformed radially. In other words, with that the boss 420 is a triangle, that the torque disc 820 is a hollow circle, and that the engaging portions 440 are respectively located at three corners of the triangle to correspond to the coupling portions 830, three deforming spaces S1 may be respectively formed between three side edges of the triangle of the boss 420 and the inner edge of the hollow circle. Portions of the hollow circle corresponding to the side edges of the triangle of the boss 420 may be the portions that may be deformed radially and inward. Hence, with the configuration that each of the torque portions 810 are respectively located at each of the portions, especially the center position of each of the side edges, each of the torque portions 810 may be deformed as forced.

The knob 500 is cap-shaped. The knob 500 may be selectively coupled to the torque unit 800 and may include at least one pushing portion 510 corresponding to the at least one torque portion 810. A number of the at least one pushing portion 510 is three. The knob 500 may further include a top recess 520 for receiving the torque unit 800. The three pushing portions 510 are disposed at the side wall of the top recess 520 with intervals, and each of the pushing portions 510 may correspond to each of the torque portions 810. Each of the pushing portions 510 may include a pushing inclined surface 511 (labeled in FIG. 6) to correspond to the forced inclined surface 811 of each of the torque portions 810, and each of the pushing portions 510 pushes each of the torque portions 810 to rotate the engaging unit 400 in the tensioning direction A1.

FIG. 4 shows one cross-sectional side view of the fastening device 100 of the first embodiment of FIG. 1. FIG. 5 shows another cross-sectional side view of the fastening device 100 of the first embodiment of FIG. 1. FIG. 6 shows a cross-sectional top view of the fastening device 100 of the first embodiment of FIG. 4 taken along line 6-6. The fastening device 100 may further include the connecting unit. One end of the connecting unit is connected to the knob 500, and another end of the connecting unit is connected to the spool 300. The connecting unit may include a positioning post 600 and a screwing member. The positioning post 600 includes a positioning protrusion 610. The positioning post 600 is inserted upward into the spool 300 and the sun gear 710 and then enters a central post of the knob 500. The screwing member is inserted downward into the central post to fasten with the positioning post 600. The positioning post 600 and the knob 500 are connected in the axis 11.

As shown in FIGS. 4 and 6, the knob 500 is not pulled up, and the engaging unit 400 is positioned at a first position. The pushing inclined surface 511 of each of the pushing portions 510 corresponds the forced inclined surface 811 of each of the torque portions 810 of the torque unit 800, the driving teeth 460 of the engaging unit 400 is engaged with the sun gear 710, and each of the pawl arms 430 is engaged with the engaging teeth 240. As the user holds and rotates the knob 500 in the tensioning direction A1, each of the pushing portions 510 pushes each of the torque portions 810 to transmit the rotating force of the knob 500 to the engaging unit 400, the distal end of each of the pawl arms 430 is continuously disengaged from the engaging teeth 240, and the engaging unit 400 may drive the spool 300 to rotate in the tensioning direction A1 for tensioning the lace via the transmission set 700.

As the lace is tensioned, a force will exert on the spool 300 and try to rotate the spool 300 in a releasing direction A2, and each of the torque portions 810 will try to push each of the pushing portions 510 toward the releasing direction A2 so as to prevent from moving by each of the pushing portions 510 of the knob 500. Consequently, as the force born by each of the torque portions 810 exceeds the threshold, the forced inclined surface 811 thereof slides relative to the pushing inclined surface 511 of each of the pushing portions 510, and each of the forced inclined surfaces 811 deforms radially and inward to allow each of the pushing portions 510 to cross over each of the torque portions 810, the knob 500 cannot drive the torque unit 800, and the spool 300 cannot be driven in the tensioning direction A1 for tensioning the lace. As the user stops exerting the force, the distal end of each of the pawl arms 430 is engaged with the engaging teeth 240 to prohibit the spool 300 from rotating in the releasing direction A2, and the lace cannot be released.

As shown in FIG. 5, the knob 500 is pulled upward to release the lace. As the knob 500 is pulled upward, the knob 500 and the positioning post 600 are moved along the axial axis 11. The positioning protrusion 610 of the positioning post 600 may be moved from a lower side of projections of the flexible clamping portion 330 to an upper side of the projections of the flexible clamping portion 330. The positioning post 600 moves the engaging unit 400 upward along the axis 11 to switch from the first position to a second position. At this time, each of the pawl arms 430 of the engaging unit 400 is disengaged from the engaging teeth 240, the engaging unit 400 does not prohibit the spool 300 from rotating in the releasing direction A2, and the lace is released.

FIG. 7 shows a three-dimensional schematic view of a fastening device 100a according to a second embodiment of the present disclosure. FIG. 8 shows one exploded view of the fastening device 100a of the second embodiment of FIG. 7. FIG. 9 shows another exploded view of the fastening device 100a of the second embodiment of FIG. 7. The structure of the fastening device 100a of the second embodiment is similar to the structure of the fastening device 100 of the first embodiment and includes a knob 500a, a torque unit 800a, an engaging unit 400a, a transmission set 700a, a spool 300a and a case unit 200a. Only the differences thereof are illustrated hereinafter, and the identical or similar contents will not be repeated.

The torque unit 800a may include a torque disc 820a, three torque portions 810a and three coupling portions 830a. The three coupling portions 830a are disposed at an upper edge of the torque disc 820a and are coupled to the knob 500a, thereby rotably connecting the torque unit 800a and the knob 500a. The three torque portions 810a may be disposed at an inner edge of the torque disc 820a. The engaging unit 400a may further include three forced portions 470a respectively corresponding to the three torque portions 810a. As a force born by each of the torque portions 810a exceeds a threshold, each of the torque portions 810a is deformed to allow each of the torque portions 810a to move from one side of each of the forced portions 470a to another side of each of the forced portions 470a. It is noted that, a number of the forced portions 470a corresponds to a number of the torque portions 810a. Therefore, in other embodiments, as a number of the torque portion is at least one, a number of the forced portion is at least one.

Precisely, the knob 500a may include three engaging holes 530a disposed at an inner top of the knob 500a with intervals. Each of the engaging holes 530a is for each of the coupling portions 830a to insert therein, thereby assembling and rotably connecting the torque unit 800a and the knob 500a.

A boss 420a of the engaging unit 400a may be a hollow circle, and each of the forced portions 470a may extend from an outer edge of the boss 420a radially and outward. As the engaging unit 400a and the torque unit 800a are assembled, each of the forced portions 470a may contact each of the torque portions 810a.

FIG. 10 shows one cross-sectional side view of the fastening device 100a of the second embodiment of FIG. 7. FIG. 11 shows another cross-sectional side view of the fastening device 100a of the second embodiment of FIG. 7. FIG. 12 shows a cross-sectional top view of the fastening device 100a of the second embodiment of FIG. 10 taken along line 12-12. As shown in FIGS. 10 and 12, the knob 500a is not pulled up, and the engaging unit 400a is positioned at a first position. As the user holds and rotates the knob 500a in the tensioning direction A1, the torque unit 800a is rotated to allow each of the torque portions 810a to push each of the forced portions 470a and to transmit a rotating force of the knob 500a to the engaging unit 400a, thereby driving the spool 300a to rotate in the tensioning direction A1 to tension the lace.

As the lace is tensioned, a force will exert on the spool 300a and try to rotate the spool 300a in the releasing direction A2, and each of the forced portions 470a will try to push each of the torque portions 810a toward the releasing direction A2. Consequently, as a force born by each of the torque portions 810a exceeds a threshold, each of the torque portions 810a deforms radially and outward. The knob 500a and the torque unit 800a rotate relative to the engaging unit 400a, and the spool 300a cannot be driven in the tensioning direction A1 for tensioning the lace. It is noted that, a gap is contained between the torque disc 820a and an inner annular surface of the knob 500a, and the gap is for the torque disc 820a to deform radially and outward. Moreover, as shown in FIG. 11, the knob 500a is pulled upward to release the lace, and details thereof will not be repeated.

FIG. 13 shows a three-dimensional schematic view of a fastening device 100b according to a third embodiment of the present disclosure. FIG. 14 shows one exploded view of the fastening device 100b of the third embodiment of FIG. 13. FIG. 15 shows another exploded view of the fastening device 100b of the third embodiment of FIG. 13. The structure of the fastening device 100b of the third embodiment is similar to the structure of the fastening device 100 of the first embodiment and includes a knob 500b, a torque unit 800b, an engaging unit 400b, a transmission set 700b, a spool 300b and a case unit 200b. Only the differences thereof are illustrated hereinafter, and the identical or similar contents will not be repeated.

The torque unit 800b and the engaging unit 400b are rotably connected. The torque unit 800b includes a torque disc 820b and three torque portions 810b, each of the torque portions 810b extends along a circumferential direction of the torque unit 800b, especially extending along the circumferential direction of the torque disc 820b. The knob 500b includes three pushing portions 510b respectively pushing the distal ends of the three torque portions 810b to rotate the spool 300b in the tensioning direction A1. As a force born by each of the torque portions 810b exceeds a threshold, a friction force between a friction surface 812b of each of the torque portions 810b and the case unit 200b prohibits the knob 500b from rotating the spool 300b.

To be more specific, the torque unit 800b includes three connecting portions (not labeled), the three connecting portions are disposed at an outer edge of the torque disc 820b with intervals, and each of the connecting portions extends radially and outward. Each of the torque portions 810b extends integrally along the circumference direction from one side surface of each of the connecting portions, and a distal end of each of the torque portions 810b includes an end plane 813b (labeled in FIG. 18). Each of the pushing portions 510b of the knob 500b may include a pushing surface 512b (labeled in FIG. 18) abutted against each of the end plane 813b, and as the knob 500b is rotated in the tensioning direction A1, each of the torque portions 810b is pushed so as to allow the torque unit 800b to rotate in the tensioning direction A1.

The torque unit 800b may further include three engaging grooves 840b depressedly disposed at the torque disc 820b. The engaging unit 400b may include three engaging protrusions 480b, and the engaging protrusions 480b are respectively engaged with the engaging grooves 840b, thereby rotably connecting the torque unit 800b and the engaging unit 400b.

The housing 210b of the case unit 200b may include an upper portion 211b. The upper portion 211b is located at an upper side of engaging teeth 240b and is toothless. After the torque unit 800b is assembled in the case unit 200b, the friction surface 812b of each of the torque portions 810b faces toward the upper portion 211b.

FIG. 16 shows one cross-sectional side view of the fastening device 100b of the third embodiment of FIG. 13. FIG. 17 shows another cross-sectional side view of the fastening device 100b of the third embodiment of FIG. 13. FIG. 18 shows a cross-sectional top view of the fastening device 100b of the third embodiment of FIG. 16 taken along line 18-18. As shown in FIGS. 16 and 18, the knob 500b is not pulled up, and the engaging unit 400b is positioned at a first position. As the user holds and rotates the knob 500b in the tensioning direction A1, each of the pushing portions 510b may push each of the torque portions 810b to rotate the torque unit 800b for transmitting a rotating force of the knob 500b to the engaging unit 400b, thereby driving the spool 300b to rotate in the tensioning direction A1 to tension the lace.

As the lace is tensioned, a force will exert on the spool 300b and try to rotate the spool 300b in the releasing direction A2, which causes difficulty in rotating the engaging unit 400b in the tensioning direction A1. Therefore, as each of the pushing portions 510b pushes each of the torque portions 810b, each of the torque portions 810b will be bended so as to allow the friction surface 812b thereof contacts an inner wall of the upper portion 211b of the housing 210b to generate the friction force. As a force born by each of the torque portions 810b exceeds a threshold, a bending curve of each of the torque portions 810b becomes larger, which may lead to a larger contacting surface between each of the friction surfaces 812b and the upper portion 211b. As a result, the friction force is increased, the knob 500b cannot drive the torque unit 800b to rotate in the tensioning direction A1, and the spool 300b cannot be driven in the tensioning direction A1 for tensioning the lace. Moreover, as shown in FIG. 17, the knob 500b is pulled upward to release the lace, and details thereof will not be repeated.

FIG. 19 shows a three-dimensional schematic view of a fastening device 100c according to a fourth embodiment of the present disclosure. FIG. 20 shows one exploded view of the fastening device 100c of the fourth embodiment of FIG. 19. FIG. 21 shows another exploded view of the fastening device 100c of the fourth embodiment of FIG. 19. The structure of the fastening device 100c of the forth embodiment is similar to the structure of the fastening device 100b of the third embodiment and includes a knob 500c, a torque unit 800c, an engaging unit 400c, a transmission set 700c, a spool 300c and a case unit 200c. Only the differences thereof are illustrated hereinafter, and the identical or similar contents will not be repeated.

The torque unit 800c and the engaging unit 400c are rotably connected. The torque unit 800c includes a torque disc 820c and three torque portions 810c, and each of the torque portions 810c extends along a circumferential direction of the torque unit 800c, especially extending along the circumferential direction of the torque disc 820c. Each of the torque portions 810c may include a torque tooth 814c. The knob 500c includes three pushing portions 510c respectively pushing the three torque portions 810c to rotate the spool 300c in the tensioning direction A1. The case unit 200c may include a plurality of depressions 270c. As a force born by each of the torque portions 810c exceeds a threshold, each of the torque portions 810c is bended to allow the torque tooth 814c thereof to engage with one of the depressions 270c, thereby prohibiting the knob 500c from rotating the spool 300c.

Precisely, the housing 210c of the case unit 200c may include an upper portion 211c. The upper portion 211c is located an upper side of engaging teeth 240c, and the depressions 270c are located at the upper portion 211c. The torque tooth 814c of each of the torque portions 810c may have an external toothed structure and is near a distal end of each of the torque portions 810c. After the torque unit 800c is assembled in the case unit 200c, the torque tooth 814c of each of the torque portions 810c faces toward the depressions 270c.

FIG. 22 shows one cross-sectional side view of the fastening device 100c of the fourth embodiment of FIG. 19. FIG. 23 shows another cross-sectional side view of the fastening device 100c of the fourth embodiment of FIG. 19. FIG. 24 shows a cross-sectional top view of the fastening device 100c of the fourth embodiment of FIG. 22 taken along line 24-24. As shown in FIGS. 22 and 24, the knob 500c is not pulled up, and the engaging unit 400c is positioned at a first position. As the user holds and rotates the knob 500c in the tensioning direction A1, each of the pushing portions 510c may push each of the torque portions 810c to rotate to torque unit 800c for transmitting a rotating force of the knob 500c to the engaging unit 400c owing to that the torque tooth 814c of each of the torque portions 810c does not engage with the depressions 270c, thereby driving the spool 300c to rotate in the tensioning direction A1 to tension the lace.

As the lace is tensioned, a force will exert on the spool 300c and try to rotate the spool 300c in the releasing direction A2, which causes difficulty in rotating the engaging unit 400c in the tensioning direction A1. Therefore, as each of the pushing portions 510c pushes each of the torque portions 810c, each of the torque portions 810c will be bended, and the torque tooth 814c of each of the torque portions 810c starts to engage with the depressions 270c. As a force born by each of the torque portions 810c exceeds a threshold, a bending curve of each of the torque portions 810c becomes larger, which may lead to a complete engagement between the torque tooth 814c of each of the torque portions 810c and the depressions 270c. As a result, the knob 500c cannot drive the torque unit 800c to rotate in the tensioning direction A1, and the spool 300c cannot be driven in the tensioning direction A1 for tensioning the lace. Moreover, as shown in FIG. 23, the knob 500c is pulled upward to release the lace, and details thereof will not be repeated.

FIG. 25 shows a three-dimensional schematic view of a fastening device 100d according to a fifth embodiment of the present disclosure. FIG. 26 shows one exploded view of the fastening device 100d of the fifth embodiment of FIG. 25. FIG. 27 shows another exploded view of the fastening device 100d of the fifth embodiment of FIG. 25. The structure of the fastening device 100d of the fifth embodiment is similar to the structure of the fastening device 100b of the third embodiment and includes a knob 500d, an engaging unit 400d, a transmission set 700d, a spool 300d and a case unit 200d, and the engaging unit 400d includes at least one pawl arm 430d. Only the differences thereof are illustrated hereinafter, and the identical or similar contents will not be repeated.

The fastening device 100d may include at least one torque portion 490d, and the at least one torque portion 490d is rotably connected to the at least one pawl arm 430d. Precisely, a number of the at least one torque portion 490d is three, and a number of the at least one pawl arm 430d is three. The engaging unit 400d may include an engaging disc 410d, the three torque portions 490d and the three pawl arms 430d. The three torque portions 490d and the three pawl arms 430d are disposed at the engaging disc 410d with intervals. In other words, in the fifth embodiment, no independent torque disc is included for placing the torque portions 490d, and the torque portions 490d are disposed at the engaging disc 410d. As the engaging disc 410d is located in the upper chamber, each of the torque portions 490d may contact a partition 230d to generate a friction force.

FIG. 28 shows one cross-sectional side view of the fastening device 100d of the fifth embodiment of FIG. 25. FIG. 29 shows another cross-sectional side view of the fastening device 100d of the fourth embodiment of FIG. 25. As shown in FIG. 28, the knob 500d is not pulled up, and the engaging unit 400d is positioned at a first position. As the user holds and rotates the knob 500d in the tensioning direction A1, in a status that the tension of the lace is small, the friction between each of the torque portions 490d and the partition 230d does not affect rotation of the spool 300d owing to the small friction force therebetween. As a force born by each of the torque portions 490d exceeds a threshold, a bending curve of each of the torque portions 490d becomes larger, which may lead to a larger friction force between each of the torque portions 490d and the partition 230d. As a result, the knob 500d cannot drive the engaging unit 400d to rotate in the tensioning direction A1, and the spool 300d cannot be driven in the tensioning direction A1 for tensioning the lace, thereby preventing over tension of the lace. Moreover, as shown in FIG. 29, the knob 500d is pulled upward to release the lace, and details thereof will not be repeated.

Based on the above embodiments, with the configuration of the torque portion, as the lace is over tensioned, the knob may rotate relative to the spool in the tensioning direction, or the knob cannot be rotated in the tensioning direction, and a goal of prohibiting the spool from rotating in the tensioning direction is achieved. Moreover, the torque portion may be disposed at an independent torque disc to form an independent torque unit, or the torque portion may be disposed at the engaging disc while no independent torque unit is included, but the goal that the spool cannot rotate in the tensioning direction while the lace is over tensioned has to be achieved. In addition, a friction force may be generated between the torque portion and any part of the case unit or any part of the knob to prohibit rotation of the knob in the tensioning direction, and the present disclosure is not limited thereto.

Although the present disclosure has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.

It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present disclosure without departing from the scope or spirit of the present disclosure. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of this present disclosure provided they fall within the scope of the following claims.

Claims

1. A fastening device, comprising: a case unit comprising an inner space;a spool received within the inner space and configured for a lace to be wound thereabout;an engaging unit disposed above the spool along an axis;a torque unit disposed above the engaging unit along the axis and comprising at least one torque portion; anda knob covering the case unit;wherein as a rotation of the knob in a tensioning direction causes the torque unit to drive the engaging unit for allowing the knob to drive the spool, the spool is rotated in the tensioning direction to tension the lace, and as a force born by the at least one torque portion exceeds a threshold, the spool is not rotated in the tensioning direction.

2. The fastening device of claim 1, wherein the engaging unit comprises at least one engaging portion, the torque unit further comprises at least one coupling portion corresponding to the at least one engaging portion, and the at least one coupling portion and the at least one torque portion are staggered along an radial direction.

3. The fastening device of claim 2, wherein the torque unit further comprises a torque disc, the at least one coupling portion is disposed at an inner edge of the torque disc, and the at least one torque portion is located at an outer edge of the torque disc.

4. The fastening device of claim 3, wherein the engaging unit comprises an engaging disc and a boss, the boss is integrally connected to the engaging disc, the at least one engaging portion is disposed at the boss, and at least one deforming space is formed between the inner edge of the torque disc and at least one side edge of the boss, thereby allowing the at least one torque portion to be deformed inward.

5. The fastening device of claim 3, wherein the knob comprises at least one pushing portion corresponding to the at least one torque portion, and as the force born by the at least one torque portion exceeds the threshold, the at least one torque portion is deformed to allow the at least one pushing portion to move from one side of the at least one torque portion to another side of the at least one torque portion.

6. The fastening device of claim 5, wherein the at least one torque portion comprises a forced inclined surface, and the at least one pushing portion comprises a pushing inclined surface corresponding to the forced inclined surface of the at least one torque portion.

7. The fastening device of claim 2, wherein the torque unit further comprises a torque disc, the at least one coupling portion is disposed at an upper edge of the torque disc, and the at least one torque portion is disposed at an inner edge of the torque disc.

8. The fastening device of claim 3, wherein the engaging unit further comprises at least one forced portion corresponding to the at least one torque portion, and as the force born by the at least one torque portion exceeds the threshold, the at least one torque portion is deformed to allow the at least one torque portion to move from one side of the at least one forced portion to another side of the at least one forced portion.

9. The fastening device of claim 1, wherein the torque unit and the engaging unit are rotably connected, the at least one torque portion extends along a circumferential direction of the torque unit, the knob comprises at least one pushing portion pushing a distal end of the at least one torque portion to rotate the spool in the tensioning direction, and as the force born by the at least one torque portion exceeds the threshold, a friction force between a friction surface of the at least one torque portion and an inner wall of the case unit prohibits the knob from rotating the spool.

10. The fastening device of claim 1, wherein the torque unit and the engaging unit are rotably connected, the at least one torque portion extends along a circumferential direction of the torque unit and comprises a torque tooth, the knob comprises at least one pushing portion pushing the at least one torque portion to rotate the spool in the tensioning direction, the case unit comprises a plurality of depressions, and as the force born by the at least one torque portion exceeds the threshold, the at least one torque portion is bended so as to allow the torque tooth to be engaged with one of the depressions to prohibit the knob from rotating the spool.

11. A fastening device, comprising: a case unit comprising an inner space and a plurality of engaging teeth;a spool received within the inner space and configured for a lace to be wound thereabout;a knob covering the case unit;at least one pawl arm received in the inner space and corresponding to at least one of the engaging teeth; andat least one torque portion received in the inner space and being rotably connected to one of the knob and the at least one pawl arm;wherein as a rotation of the knob in a tensioning direction causes the at least one pawl arm to rotate, the spool is rotated in the tensioning direction to tension the lace, and as the lace is over tensioned, the at least one torque portion prohibits the spool from rotating in the tensioning direction.

12. The fastening device of claim 11, further comprising a connecting unit, wherein one end of the connecting unit is connected to the knob, and another end of the connecting unit is coupled to the spool.

13. The fastening device of claim 12, wherein the connecting unit comprises a positioning post, and the spool comprises a flexible clamping portion coupled to the positioning post.

14. The fastening device of claim 11, further comprising a torque disc and at least one coupling portion, wherein the at least one coupling portion and the at least one torque portion are disposed at the torque disc with an interval.

15. The fastening device of claim 14, further comprising an engaging disc, a boss and at least one engaging portion, wherein the at least one coupling portion is disposed at an inner edge of the torque disc, the at least one torque portion is located at an outer edge of the torque disc, the at least one pawl arm is disposed at the engaging disc, the boss is integrally connected to the engaging disc along an axis, the at least one engaging portion is disposed at the boss and correspondingly engaged with the at least one coupling portion to allow the at least one torque portion to be rotably connected to the at least one pawl arm, and at least one deforming space is formed between the inner edge of the torque disc and at least one side edge of the boss, thereby allowing the at least one torque portion to be deformed inward.

16. The fastening device of claim 14, wherein the knob comprises at least one pushing portion corresponding to the at least one torque portion, and as a force born by the at least one torque portion exceeds a threshold, the at least one torque portion is deformed to allow the at least one pushing portion to move from one side of the at least one torque portion to another side of the at least one torque portion.

17. The fastening device of claim 14, further comprising an engaging disc and at least one forced portion, wherein the at least one forced portion is disposed at the engaging disc and corresponds to the at least one torque portion, the at least one coupling portion is disposed at an upper edge of the torque disc and coupled to the knob to allow the torque disc to be rotably connected to the knob, the at least one torque portion is disposed at an inner edge of the torque disc, and as a forced born by the at least one torque portion exceeds a threshold, the at least one torque portion is deformed to allow the at least one torque portion to move from one side of the at least one forced portion to another side of the at least one forced portion.

18. The fastening device of claim 11, wherein the at least one torque portion and the at least one pawl arm are rotably connected, the knob comprises at least one pushing portion pushing the at least one torque portion to rotate the spool in the tensioning direction, and as a forced born by the at least one torque portion exceeds a threshold, a friction force between a friction surface of the at least one torque portion and the case unit prohibits the knob from rotating the spool.

19. The fastening device of claim 11, wherein the at least one torque portion and the at least one pawl arm are rotably connected, the at least one torque portion comprises a torque tooth, the knob comprises at least one pushing portion pushing the at least one torque portion to rotate the spool in the tensioning direction, the case unit comprises a plurality of depressions, and as a forced born by the at least one torque portion exceeds a threshold, the at least one torque portion is bended so as to allow the torque tooth to be engaged with one of the depressions to prohibit the knob from rotating the spool.

20. The fastening device of claim 11, further comprising an engaging disc, wherein the at least one torque portion and the at least one pawl arm are disposed at the engaging disc with an interval, the case unit further comprises a housing and a partition, the partition protrudes inward from the housing to separate the inner space into an upper chamber and a lower chamber, the engaging teeth are located at the housing and are in the upper chamber, and the at least one torque portion contacts the partition to generate a friction force.