Fastening device

Abstract

A fastening device includes a case unit, a spool, a connecting unit, a knob and an engaging unit. The case unit includes a wall forming a receiving space, a partition separates the receiving space into an upper chamber and a lower chamber, a through hole located at the partition, and a base detachably connected to at least one part of the wall. The spool is located at the lower chamber. The knob is connected to the connecting unit. The engaging unit is located at the upper chamber. After the connecting unit is inserted into the spool, the through hole and the engaging unit to couple to the knob, the partition, the spool, the connecting unit, the knob and the engaging unit are connected integrally without being separated from each other while the base is separated from the at least one part of the wall.

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, the structure of the buckle is complex; as a result, the manufacturing cost is increased, and the buckle has assembly and repair difficulty.

Based on the above-mentioned problems, how to simplify the structure of the fastening device, reduce the manufacturing cost and maintain the securing capability becomes a pursuit target for practitioners.

SUMMARY

According to one aspect of the present disclosure, a fastening device includes a case unit, a spool, a connecting unit, a knob and an engaging unit. The case unit includes a wall forming a receiving space, a partition protruding radially from the wall to separate the receiving space into an upper chamber and a lower chamber, a through hole located at the partition, and a base detachably connected to at least one part of the wall. The spool is located at the lower chamber. The connecting unit is inserted into the spool. The knob covers on the case unit and is connected to the connecting unit. The engaging unit is located at the upper chamber. After the connecting unit is inserted into the spool, the through hole and the engaging unit to couple to the knob, the partition, the spool, the connecting unit, the knob and the engaging unit are connected integrally without being separated from each other while the base is separated from the at least one part of the wall.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be more fully understood by reading the following detailed description of the embodiments, 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 FIG. 1.

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

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

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

FIG. 6 shows a three dimensional schematic view of a fastening device according to a second embodiment of the present disclosure.

FIG. 7 shows one exploded view of the fastening device of FIG. 6.

FIG. 8 shows another exploded view of the fastening device of FIG. 6.

FIG. 9 shows one cross-sectional view of the fastening device of FIG. 6.

FIG. 10 shows another cross-sectional view of the fastening device of FIG. 6.

FIG. 11 shows one exploded view of a fastening device according to a third embodiment of the present disclosure.

FIG. 12 shows another exploded view of the fastening device of FIG. 11.

FIG. 13 shows a cross-sectional view of the fastening device of FIG. 11.

FIG. 14 shows one exploded view of a fastening device according to a forth embodiment of the present disclosure.

FIG. 15 shows another exploded view of the fastening device of FIG. 14.

FIG. 16 shows a cross-sectional view of the fastening device of FIG. 14.

FIG. 17 shows one exploded view of a fastening device according to a fifth embodiment of the present disclosure.

FIG. 18 shows another exploded view of the fastening device of FIG. 17.

FIG. 19 shows a cross-sectional view of the fastening device of FIG. 17.

FIG. 20 shows one exploded view of a fastening device according to a sixth embodiment of the present disclosure.

FIG. 21 shows another exploded view of the fastening device of FIG. 20.

FIG. 22 shows a cross-sectional view of the fastening device of FIG. 20.

FIG. 23 shows one exploded view of a fastening device according to a seventh embodiment of the present disclosure.

FIG. 24 shows another exploded view of the fastening device of FIG. 23.

FIG. 25 shows a cross-sectional view of the fastening device of FIG. 23.

FIG. 26 shows one exploded view of a fastening device according to an eighth embodiment of the present disclosure.

FIG. 27 shows another exploded view of the fastening device of FIG. 26.

FIG. 28 shows a cross-sectional view of the fastening device of FIG. 26.

DETAILED DESCRIPTION

It will be understood that when an element (or mechanism or module) is referred to as being “disposed on”, “connected to” or “coupled to” another element, it can be directly disposed on, connected or coupled to the other one element, or it can be indirectly disposed on, connected or coupled to the other one element, that is, intervening elements may be present. In contrast, when an element is referred to as being “directly disposed on,” “directly connected to” or “directly coupled to” another element, there are no intervening elements present.

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.

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 FIG. 1. FIG. 3 shows another exploded view of the fastening device 100 of FIG. 1. FIG. 4 shows one cross-sectional view of the fastening device 100 of FIG. 1. FIG. 5 shows another cross-sectional view of the fastening device 100 of FIG. 1. As shown in FIG. 1 to FIG. 5, the fastening device 100 includes a case unit 200, a knob 500 and an engaging unit 400.

The case unit 200 includes a wall 220 forming a receiving space (not labeled) and a plurality of mounting teeth 240 located at the wall 220 and facing toward the receiving space. The knob 500 covers on the case unit 200. The engaging unit 400 is within the receiving space. The engaging unit 400 corresponds to the mounting teeth 240 and is selectively coupled to the knob 500. The knob 500 is switched between a first position and a second position along an axial direction I1. When the knob 500 is in the first position to couple to the engaging unit 400, the engaging unit 400 is linked up with the knob 500 and the engaging unit 400 is engaged with one of the mounting teeth 240 to prohibit the knob 500 from rotating in a first direction R1, and when the knob 500 is in the second position to disengage from the engaging unit 400, the engaging unit 400 does not prohibit the knob 500 from rotating in the first direction R1.

Hence, since the knob 500 is the only one which moves along the axial direction I1, and the engaging unit 400 is remained in the original position, the structure reliability is increased. The details of the fastening device 100 will be described in the following paragraphs.

The case unit 200 can include the wall 220, a partition 230 and the plurality of mounting teeth 240. The partition 230 protrudes radially from the wall 220 to separate the receiving space into an upper chamber S11 and a lower chamber S12. The engaging unit 400 is located at the upper chamber S11. To be more specific, the case unit 200 can further include a base 210, and the wall 220 can include an upper wall portion 221 and a lower wall portion 222. The lower wall portion 222 is affixed to the base 210, and the partition 230 is connected to a lower end of the upper wall portion 221. The wall 220 can further include four positioning portions 223 and four positioning holes 224. Each of the positioning portions 223 protrudes downward from the lower end of the upper wall portion 221. Each of the positioning holes 224 is located at the lower wall portion 222, and is configured to receive the positioning portion 223. After the positioning portions 223 are engaged with the positioning holes 224, the lower chamber S12 is formed by the base 210, the lower wall portion 222 and the partition 230, and the upper chamber S11 is formed by the upper wall portion 221 and the partition 230.

The case unit 200 can further include a limiting portion 250. The limiting portion 250 is located at the upper chamber S11 and connected to the partition 230. The limiting portion 250 limits the engaging unit 400. Through the configuration of the limiting portion 250, the engaging unit 400 can be limited in the upper chamber S11 and is prohibited from separating from the case unit 200. Preferably, the case unit 200 can include a through hole 260 located at the partition 230. The limiting portion 250 includes four limiting arms 251 spaced apart circumferentially around the through hole 260. Each of the limiting arms 251 has a free end 2511 configured to limit the engaging unit 400. The through hole 260 penetrating a center of the partition 230 along the axial direction I1 allows the lower chamber S12 to communicate with the upper chamber S11. The four limiting arms 251 protrude upward from a part of the partition 230, which is near the through hole 260, and form the free ends 2511 of lipped structure. Therefore, the engaging unit 400 can be put downward into the upper chamber S11 along the axial direction I1, and the four limiting arms 251 will be displaced so as to pass through a central hole (not labeled) of the engaging unit 400. After the engaging unit 400 is put into the upper chamber S11, the four limiting arms 251 are restored and the free ends 2511 limit the engaging unit 400 such that the engaging unit 400 is limited in the upper chamber S11.

The fastening device 100 can further include a spool 300 and a central shaft 600. The spool 300 is within the receiving space and includes an engaging portion 340. The central shaft 600 is inserted into the spool 300 to couple to the engaging portion 340. The central shaft 600 has the axial direction I1 and is linked up with the knob 500. When the knob 500 is in the first position to couple to the engaging unit 400, the engaging unit 400 is engaged with one of the mounting teeth 240 to prohibit the spool 300 from rotating in the first direction R1, and when the knob 500 is in the second position to disengage from the engaging unit 400, the engaging unit 400 does not prohibit the spool 300 from rotating in the first direction R1.

The spool 300 can include a hollow body 310, an upper ring portion 320 and a lower ring portion 330. The hollow body 310 includes an inner surface 311 forming a hollow space T2 configured for the central shaft 600 to inert therein. The upper ring portion 320 protrudes outward from one of two ends of the hollow body 310. The lower ring portion 330 protrudes outward from the other one of the two ends of the hollow body 310. A winding track T1 is formed between the upper ring portion 320 and the lower ring portion 330, and the engaging portion 340 protrudes from the inner surface 311 toward the hollow space T2 to couple to the central shaft 600. In addition, the central shaft 600 can include a positioning protrusion 610. When the knob 500 is in the first position, the positioning protrusion 610 is located at one of two sides of the engaging portion 340, and when the knob 500 is switched from the first position to the second position along the axial direction I1, the engaging portion 340 is displaced by the positioning protrusion 610 such that the positioning protrusion 610 is switched to the other one of the two sides of the engaging portion 340.

To be more specific, the inner surface 311 has an upper region 3112 and a lower region 3111. The upper region 3112 includes a vertical section (not labeled) and an inclined section (not labeled). The vertical section is connected to the inclined section, and the inclined section is connected to the lower region 3111. The engaging portion 340 includes four clamping arms 341, and each of the clamping arms 341 protrudes from the inclined section toward the hollow space T2 to form a clamping end 3411 of lipped structure. The central shaft 600 can further include a base portion 620 and a shaft portion 630. The shaft portion 630 is disposed at the base portion 620, and the positioning protrusion 610 is located at the shaft portion 630. Hence, the central shaft 600 can be put upward into the hollow space T2 to engage with the engaging portion 340, and the base portion 620 can be limited in the lower region 3111. The fastening device 100 can further include a screw member 700. The screw member 700 connects the central shaft 600 to the knob 500 such that the central shaft 600 is linked up with the knob 500.

When operation of the knob 500 causes the central shaft 600 to move upward along the axial direction I1, the positioning protrusion 610 pushes the four clamping arms 341 such that the four clamping arms 341 are displaced radially, and the positioning protrusion 610 can move from one of the two sides of the engaging portion 340 to the other one of the two sides of the engaging portion 340. Subsequently, the four clamping arms 341 are restored such that the knob 500 can remain in the second position.

The winding track T1 is configured for a lace (not shown) to wind thereabout. The case unit 200 can further include two lace holes 270. The two lace holes 270 are located at the lower wall portion 222, and the lace holes 270 can communicate with the lower chamber S12. Consequently, the lace can go out or drawn back into the lower chamber S12 to be released from or wound about the winding track T1 via the two lace holes 270.

The knob 500 can include a plurality of first driving teeth 540, and the engaging unit 400 can include a plurality of first combining teeth 410. When the knob 500 is in the first position, the first driving teeth 540 are engaged with the first combining teeth 410, and when the knob 500 is in the second position, the first driving teeth 540 are disengaged from the first combining teeth 410. Additionally, the knob 500 can further include a cap body 510 covering on the case unit 200, a post 520 disposed at the cap body 510 and protruding into the through hole 260, and a plurality of second driving teeth 530 located at a distal end of the post 520 to couple to the spool 300.

The cap body 510 of the knob 500 includes an inner top surface (not shown), and the post 520 protrudes downward from the inner top surface. The second driving teeth 530 are located at an outer surface of the post 520, and the first driving teeth 540 are located at the inner top surface and surround the post 520. The engaging unit 400 can include a hollow ring body 430, and the first combining teeth 410 are located at the top end of the hollow ring body 430. When the cap body 510 and the case unit 200 are assembled, the post 520 can protrude into the through hole 260 such that the second driving teeth 530 are engaged with a plurality of second combining teeth (not labeled) which are located at the upper region 3112 to allow the knob 500 to couple to the spool 300.

In the embodiment, the engaging unit 400 can further include a plurality of pawl arms 420, and each of the pawl arms 420 protrudes outward from the hollow ring body 430. Each of the pawl arms 420 is engaged with at least one of the mounting teeth 240 in the first direction R1 to prohibit the engaging unit 400 from rotating in the first direction R1. On the other hand, each of the pawl arms 420 is disengaged from the mounting teeth 240 in a second direction R2 opposite to the first direction R1, and the engaging unit 400 is allowed to rotate in the second direction R2 relative to the case unit 200.

When the knob 500 is in the first position, as shown in FIG. 4, the first driving teeth 540 of the knob 500 are engaged with the first combining teeth 410 of the engaging unit 400, and the second driving teeth 530 of the knob 500 are engaged with the second combining teeth of the spool 300 such that rotation of the knob 500 by a user in the second direction R2 causes the pawl arms 420 to disengage from the mounting teeth 240, and the spool 300 can be linked up with the knob 500 to retract the lace. On the contrary, when the knob 500 is released by the user, each of the pawl arms 420 can engage with at least one of the mounting teeth 240, and rotation of the knob 500 is limited by the engaging unit 400. Meanwhile, rotation of the spool 300 in the first direction R1 is inhibited, and the lace is fastened.

When the user is looking forward to release the lace, as shown in FIG. 5, the knob 500 can be raised along the axial direction I1. The first driving teeth 540 of the knob 500 are disengaged from the first combining teeth 410 of the engaging unit 400, and the second driving teeth 530 of the knob 500 are disengaged from the second combining teeth of the spool 300. As a result, rotation of the knob 500 and the spool 300 are not inhibited by the engaging unit 400. In other embodiment, when the knob is in the second position, the engagement between the second driving teeth of the knob and the second combining teeth of the spool can be remained, but the present disclosure is not limited thereto.

FIG. 6 shows a three dimensional schematic view of a fastening device 100a according to a second embodiment of the present disclosure. FIG. 7 shows one exploded view of the fastening device 100a of FIG. 6. FIG. 8 shows another exploded view of the fastening device 100a of FIG. 6. FIG. 9 shows one cross-sectional view of the fastening device 100a of FIG. 6. FIG. 10 shows another cross-sectional view of the fastening device 100a of FIG. 6. The structure of the fastening device 100a is similar to the structure of the fastening device 100, but the spool 300a is coupled to the knob 500a in a different way.

To be more specific, the knob 500a can further include a cap body 510a, a post 520a and a plurality of second driving teeth 530a. The cap body 510a covers on the case unit 200a. The post 520a is disposed at the cap body 510a and protrudes into the through hole (not labeled), and the second driving teeth 530a are located at a distal end of the post 520a. The fastening device 100a further includes a gear assembly 800a, and the gear assembly 800a includes a sun gear 810a and a plurality of planetary gears 820a. The sun gear 810a is engaged with the second driving teeth 530a. A number of the planetary gears 820a is four in the embodiment, and the planetary gears 820a are spaced away from each other. Each of the planetary gears 820a is engaged with the sun gear 810a. The case unit 200a can further include a plurality of inner teeth 280a located at the lower chamber S12 and engaged with the planetary gears 820a.

The post 520a include a cave (not labeled) located at the distal end. The second driving teeth 530a are located within the cave. The sun gear 810a is engaged with the cave to engage with the second driving teeth 530a. The spool 300a includes four pivotal shafts 350a configured for the planetary gears 820a to be pivoted thereon. The partition 230a protrudes inwardly from a middle part of the upper wall portion 221a. The upper wall portion 221a can be deemed to be separated by the partition 230a such that the upper chamber S11 can be formed by the upper section of the upper wall portion 221a, and the lower chamber S12 can be formed by the lower section of the upper wall portion 221a, the lower wall portion 222a and the base (not labeled). The inner teeth 280a can be disposed within the lower section of the upper wall portion 221a. When the knob 500a is rotated, the sun gear 810a is driven by the second driving teeth 530a, and the planetary gears 820a will rotate and move along the inner teeth 280a to rotate the spool 300a.

Therefore, as shown in FIG. 9, when the knob 500a is in the first position, the first driving teeth 540a of the knob 500a are engaged with the first combining teeth 410a of the engaging unit 400a, and the second driving teeth 530a of the knob 500a are engaged with the gear assembly 800a such that rotation of the knob 500a by a user in a second direction causes the pawl arms 420a to disengage from the mounting teeth 240a, and the spool 300a can be linked up with the knob 500a to retract the lace. On the contrary, when the knob 500a is released by the user, each of the pawl arms 420a can be engaged with at least one of the mounting teeth 240a, and rotation of the knob 500a is limited by the engaging unit 400a. Meanwhile, rotation of the spool 300a in the first direction is inhibited, and the lace is fastened.

When the user is looking forward to release the lace, as shown in FIG. 10, the knob 500a can be raised along the axial direction. The first driving teeth 540a of the knob 500a are disengaged from the first combining teeth 410a of the engaging unit 400a, and rotation of the knob 500a and the spool 300a are not inhibited by the engaging unit 400a. Since the sun gear 810a is still coupled to the planetary gears 820a, the knob 500a is still coupled to the spool 300a.

FIG. 11 shows one exploded view of a fastening device 100b according to a third embodiment of the present disclosure. FIG. 12 shows another exploded view of the fastening device 100b of FIG. 11. FIG. 13 shows a cross-sectional view of the fastening device 100b of FIG. 11. Please refer to FIGS. 11 to 13, the fastening device 100b includes a base unit (not labeled), a spool 300b, an engaging unit 400b, a knob 500b, a central shaft 600b, a screw member 700b and a gear assembly 800b. The structure of the fastening device 100b is similar to the structure of the fastening device 100a, but the mounting teeth 240b are located on the partition 230b. Moreover, the paw tooth of the pawl arm 420b is protruded downward to correspond to the mounting teeth 240b.

Therefore, as shown in FIG. 13, when the knob 500b is in the first position, rotation of the knob 500b by a user in a second direction causes the engaging unit 400b to rotate such that the pawl arms 420b are disengaged from the mounting teeth 240b, and the spool 300b can be linked with the knob 500b to retract the lace. When the user is looking forward to release the lace, the knob 500b can be raised along the axial direction to the second position. The knob 500b separates from the engaging unit 400b while the pawl arms 420b are still in the original position to engage with the mounting teeth 240b, and rotation of the knob 500b and the spool 300b are not inhibited by the engaging unit 400b.

FIG. 14 shows one exploded view of a fastening device 100c according to a forth embodiment of the present disclosure. FIG. 15 shows another exploded view of the fastening device 100c of FIG. 14. FIG. 16 shows a cross-sectional view of the fastening device 100c of FIG. 14. Please refer to FIGS. 14 to 16, the fastening device 100c includes a base unit (not labeled), a spool 300c, an engaging unit 400c, a knob 500c, a central shaft 600c, a screw member 700c and a gear assembly 800c. The structure of the fastening device 100c is similar to the structure of the fastening device 100a, but the mounting teeth 550c are located on the knob 500c. Moreover, the structure of the engaging unit 400c is different, and a plurality of engaging protrusions 290c are located on the partition 230c.

Precisely, the knob 500c can further include a cap body (not labeled), and the mounting teeth 550c are located at the annular side wall of the cap body. The pawl arms 420c are located on the upper side of the hollow ring body (not labeled) to correspond to the mounting teeth 550c, and the engaging unit 400c further includes a plurality of engaging cavities 440c located on the lower side of the hollow ring body to engage with the engaging protrusions 290c. Under such structure, the engaging unit 400c is not rotatable.

Therefore, as shown in FIG. 16, when the knob 500c is in the first position, rotation of the knob 500c by a user in a second direction causes the mounting teeth 550c to disengage from the pawl arms 420c, and the spool 300c can be linked with the knob 500c to retract the lace. When the user is looking forward to release the lace, the knob 500c can be raised along the axial direction to the second position. The knob 500c separates from the engaging unit 400c such that the mounting teeth 550c are separated from the engaging unit 400c which is still in the original position, and rotation of the knob 500c and the spool 300c are not inhibited by the engaging unit 400c.

FIG. 17 shows one exploded view of a fastening device 100d according to a fifth embodiment of the present disclosure. FIG. 18 shows another exploded view of the fastening device 100d of FIG. 17. FIG. 19 shows a cross-sectional view of the fastening device 100d of FIG. 17. Please refer to FIGS. 17 to 19, the fastening device 100d includes a base unit (not labeled), a spool 300d, an engaging unit 400d, a knob 500d, a central shaft 600d, a screw member 700d and a gear assembly 800d. The structure of the fastening device 100d is similar to the structure of the fastening device 100c, and a plurality of engaging protrusions 290d are located on the partition 230d to correspond to a plurality of engaging cavities 440d of the engaging unit 400d, but the mounting teeth 550d are located on the top surface of the cap body (not labeled) of the knob 500d. Moreover, the paw tooth of the pawl arm 420d is protruded upward to correspond to the mounting teeth 550d.

Therefore, as shown in FIG. 19, when the knob 500d is in the first position, rotation of the knob 500d by a user in a second direction causes the mounting teeth 550d to disengage from the pawl arms 420d, and the spool 300d can be linked with the knob 500d to retract the lace. When the user is looking forward to release the lace, the knob 500d can be raised along the axial direction to a second position. The knob 500d separates from the engaging unit 400d such that the mounting teeth 550d are separated from the engaging unit 400d which is still in the original position, and rotation of the knob 500d and the spool 300d are not inhibited by the engaging unit 400d.

FIG. 20 shows one exploded view of a fastening device 100e according to a sixth embodiment of the present disclosure. FIG. 21 shows another exploded view of the fastening device 100e of FIG. 20. FIG. 22 shows a cross-sectional view of the fastening device 100e of FIG. 20. Please refer to FIGS. 20 to 22, the fastening device 100e includes a base unit (not labeled), a spool 300e, an engaging unit 400e, a knob 500e, a central shaft 600e, a screw member 700e and a gear assembly 800e. The structure of the fastening device 100e is similar to the structure of the fastening device 100a, but the spool 300e is different. Precisely, the spool 300e includes two engaging portions 340e protruding downward, and a free end of each of the engaging portions 340e is engaged with the base portion 620e of the central shaft 600e.

Therefore, as shown in FIG. 22, when the knob 500e is in the first position, the base portion 620e is located in the lower side of a projection of each of the engaging portions 340e. When the user is looking forward to release the lace, the knob 500e can be raised along the axial direction to a second position, and the base portion 620e is switched to the upper side of the projection of each of the engaging portions 340e.

FIG. 23 shows one exploded view of a fastening device 100f according to a seventh embodiment of the present disclosure. FIG. 24 shows another exploded view of the fastening device 100f of FIG. 23. FIG. 25 shows a cross-sectional view of the fastening device 100f of FIG. 23. Please refer to FIGS. 23 to 25, the fastening device 100f includes a base unit (not labeled), a spool 300f, an engaging unit 400f, a knob 500f, a central shaft 600f, a screw member 700f and a gear assembly 800f, and the difference will be mentioned hereinafter. Precisely, the spool 300f does not include the two engaging portions 340e as shown in FIG. 21, and, instead, the knob 500f includes two engaging portions 560f protruding upward. The central shaft 600f is inserted downward into the knob 500f and includes an engaging head 640f for coupling with the engaging portions 560f. The screw member 700f is inserted upward from the spool 300e to couple to the central shaft 600f.

Therefore, as shown in FIG. 25, when the knob 500f is in the first position, the engaging head 640f is located in the upper side of a projection of each of the engaging portions 560f. When the user is looking forward to release the lace, the knob 500f can be raised along the axial direction to a second position, and the engaging head 640f is switched to the lower side of the projection of each of the engaging portions 560f.

FIG. 26 shows one exploded view of a fastening device 100g according to an eighth embodiment of the present disclosure. FIG. 27 shows another exploded view of the fastening device 100g of FIG. 26. FIG. 28 shows a cross-sectional view of the fastening device 100g of FIG. 26. Please refer to FIGS. 26 to 28, the fastening device 100g includes a base unit (not labeled), a spool 300g, an engaging unit 400g, a knob 500g, a central shaft 600g, a screw member 700g and a gear assembly 800g. The structure of the fastening device 100g is similar to the structure of the fastening device 100e, and the difference will be mentioned hereinafter. The spool 300g does not include the two engaging portions 340e as shown in FIG. 21, and, instead, two engaging portions 290g are protruded upward form the partition 230g. The knob 500g includes a post 520g and a positioning ring 570g, and the positioning ring 570g is located on the post 520g for coupling with the two free ends of the engaging portions 290g.

Therefore, as shown in FIG. 28, when the knob 500g is in the first position, the positioning ring 570g is located in the lower side of the engaging portions 290g. When the user is looking forward to release the lace, the knob 500g can be raised along the axial direction to a second position, and the positioning ring 570g is switched to the upper side of the engaging portions 290g.

Please be noted that, in the present disclosure, the knob can include the cap body, a central hole and a covering member. The central hole is located on the cap body configured for the screw member to pass therethrough to fasten with the central shaft, and the covering member is assembled to the cap body to cover the screw member. Only in FIGS. 11-12, 14-15 and 17-18, the covering member is shown in a manner that separates from the cap body, and the present disclosure is not limited there to.

To sum up, the fastening device can include a case unit, a spool, a connecting unit, a knob and an engaging unit. The case unit can include a wall forming a receiving space, a partition protruding radially from the wall to separate the receiving space into an upper chamber and a lower chamber, a through hole located at the partition and a base detachably connected to at least one part of the wall, as the base 210 is affixed to a lower wall portion 222 of the wall 220 and detachably connected to an upper wall portion 221 of the wall 220 as shown in FIGS. 2 and 3. The spool is located at the lower chamber. The connecting unit is inserted into the spool. The knob covers on the case unit and is connected to the connecting unit. The engaging unit is located at the upper chamber. Because the spool is located at the lower chamber and is below the partition, and the engaging unit and the knob are located above the partition, after the connecting unit is inserted into the spool, the through hole and the engaging unit to couple to the knob, the engaging unit can be hold between the partition and the knob. Hence, the partition, the spool, the connecting unit, the knob and the engaging unit can be connected integrally without being separated from each other while the base is separated from the at least one part of the wall. The connecting unit can include the central shaft and the screw member. The central shaft can be inserted form the spool and be coupled to the engaging portion of the spool, or the central shaft can be inserted form the knob and be coupled to the engaging portion of the knob. Moreover, the knob can be coupled to the engaging portion protruding from the partition. In other words, since the engaging portion is disposed on the spool, the partition or the knob but not the base, even without the base, the partition, the spool, the connecting unit, the knob and the engaging unit can still be firmly connected.

In addition, the mounting teeth can be located on the wall, the partition, the annular side wall or the top surface of the cap body of the knob, and the pawl tooth of the pawl arm can be modified to correspond to the mounting teeth.

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 disclosure. In view of the foregoing, it is intended that the present disclosure covers modifications and variations of this disclosure provided they fall within the scope of the following claims.

Claims

1. A fastening device, comprising: a case unit, comprising: a wall forming a receiving space;a partition protruding radially from the wall to separate the receiving space into an upper chamber and a lower chamber;a through hole located at the partition; anda base detachably connected to at least one part of the wall;a spool located at the lower chamber;a connecting unit inserted into the spool;a knob covering on the case unit and being connected to the connecting unit; andan engaging unit located at the upper chamber;wherein after the connecting unit is inserted into the spool, the through hole and the engaging unit to couple to the knob, the partition, the spool, the connecting unit, the knob and the engaging unit are connected integrally without being separated from each other while the base is separated from the at least one part of the wall.

2. The fastening device of claim 1, wherein the spool comprises an engaging portion, and the connecting unit comprises a central shaft coupled to the engaging portion.

3. The fastening device of claim 2, wherein the spool further comprises: a hollow body, comprising an inner surface forming a hollow space, wherein the hollow space is configured for the central shaft to insert therein;an upper ring portion protruding outward from one of two ends of the hollow body; anda lower ring portion protruding outward from the other one of the two ends of the hollow body;wherein a winding track is formed between the upper ring portion and the lower ring portion, and the engaging portion protrudes from the inner surface toward the hollow space to couple to the central shaft.

4. The fastening device of claim 3, wherein the central shaft comprises a positioning protrusion, when the knob is in a first position, the positioning protrusion is located at one of two sides of the engaging portion, and when the knob is switched from the first position to a second position along an axial direction, the engaging portion is displaced by the positioning protrusion such that the positioning protrusion is switched to the other one of the two sides of the engaging portion.

5. The fastening device of claim 4, wherein the case unit further comprises: a limiting portion located at the upper chamber and connected to the partition, the limiting portion configured to limit the engaging unit.

6. The fastening device of claim 5, wherein the limiting portion comprises four limiting arms spaced apart circumferentially around the through hole, and a free end of each of the limiting arms is configured to limit the engaging unit.

7. The fastening device of claim 6, wherein the knob comprises a plurality of first driving teeth, the engaging unit comprises a plurality of first combining teeth, when the knob is in the first position, the first driving teeth are engaged with the first combining teeth, and when the knob is in the second position, the first driving teeth are disengaged from the first combining teeth.

8. The fastening device of claim 7, wherein the knob further comprises: a cap body covering on the case unit;a post disposed at the cap body and protruding into the through hole; anda plurality of second driving teeth located at a distal end of the post to couple to the spool.

9. The fastening device of claim 1, wherein the case unit further comprises a plurality of mounting teeth located on the partition and facing toward the engaging unit.

10. The fastening device of claim 1, wherein the knob comprises: a cap body covering on the case unit and comprising an annular side wall; anda plurality of mounting teeth located on the annular side wall of the cap body.

11. The fastening device of claim 1, wherein the knob comprises: a cap body covering on the case unit and comprising a top surface; anda plurality of mounting teeth located on the top surface of the cap body.

12. The fastening device of claim 1, wherein the case unit further comprises a plurality of engaging protrusions located on the partition, and the engaging unit comprises a plurality of engaging cavities correspondingly engaged with the engaging protrusions.