CN111846339A

CN111846339A - Fastening device

Info

Publication number: CN111846339A
Application number: CN201910363085.2A
Authority: CN
Inventors: 陈金柱
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-10-30
Anticipated expiration: 2039-04-30
Also published as: CN114557512A; CN111846339B

Abstract

The invention provides a fastening device which comprises a shell unit, a knob and a braking unit, wherein the shell unit comprises a side wall and a plurality of meshing teeth, the side wall surrounds to form an accommodating space, and the meshing teeth protrude from the side wall to the accommodating space. The knob can be covered on the shell unit; the braking unit is positioned in the accommodating space, corresponds to the meshing teeth and is selectively coupled with the knob. When the knob is located at the second position, the knob is far away from the braking unit and is separated from the braking unit, and the braking unit does not prevent the knob from rotating towards the first direction. Thereby increasing the structural reliability.

Description

Fastening device

Technical Field

The present invention relates to a fastening device, and more particularly, to a fastening device capable of winding and unwinding a tie line.

Background

In daily life, a string such as a rope or a lace is often used to bind an article, and the most common means for binding is to use the string to pass through a hole on the article back and forth and then to be fixed by a knot, such as tying a rope to a shoe. However, the tying means is easy to loosen the knot due to external force factors, and not only the knot must be tied again, but also a lot of inconvenience is brought because the article cannot be tied firmly.

In order to solve the above problems, some manufacturers have developed a simple wire binding mechanism, which includes a housing, a braking unit and a spring, wherein the housing has a through hole for the wire to pass through, the wire is clamped between the braking unit and the housing by the acting force between the spring and the braking unit to achieve the fastening effect, and the spring is pressed to change the position of the braking unit so as to pull the wire to change the length of the wire. However, the wire bundling mechanism provides a fastening force through a restoring force of the spring, the wire is still easily loosened by vibration or external force, and the wire bundling mechanism has no space for accommodating the wire, so that the wire is exposed and is easily dangerous.

Therefore, another buckle capable of rotating, bundling and fixing the laces is developed by the industry, the line body of the buckle can be accommodated in the buckle, the length of the line body can be adjusted through mechanical interference of an internal component, and meanwhile, the bundling tightness is adjusted. However, the structure of the buckle is complex, which increases the manufacturing cost and has the problem of difficult assembly and maintenance.

Therefore, there is a need for a buckle that can maintain the fastening ability of the buckle while simplifying the structure and increase the reliability of the structure to avoid the reduction of the life span.

In view of the above, it is an object of the present invention to improve the structure of a fastening device such as a buckle.

Disclosure of Invention

The invention provides a fastening device, which can simplify the structure and increase the structure reliability through the integral structure configuration.

According to an embodiment of an aspect of the present invention, a fastening device is provided, which includes a housing unit, a wire coil, a positioning shaft, a knob, and a detent unit, wherein the housing unit includes a sidewall, a partition portion, and a plurality of engaging teeth, the sidewall surrounds to form a receiving space, the partition portion radially protrudes from the sidewall to divide the receiving space into an upper receiving chamber and a lower receiving chamber, and the plurality of engaging teeth are located in the upper receiving chamber. The wire coil is positioned in the lower accommodating chamber and comprises a flexible clamping part; the positioning shaft penetrates through the wire coil to be coupled with the flexible clamping part, and the positioning shaft is provided with an axial direction. The knob can be covered on the shell unit and is connected with the positioning shaft; the braking unit is positioned in the upper chamber, corresponds to the meshing teeth and is selectively coupled with the knob. When the knob is located at the second position, the knob is separated from the braking unit, and the braking unit does not prevent the wire coil from rotating towards the first direction.

Therefore, only the knob moves along the axial direction, the braking unit still remains in the original position, and the structural reliability can be improved.

According to various embodiments of the fastening device, the wire coil may include a hollow main body, an upper ring portion and a lower ring portion, the hollow main body includes an inner peripheral wall surrounding a through space for the positioning shaft to pass through, the upper ring portion protrudes radially outward from one end of the hollow main body, and the lower ring portion protrudes radially outward from the other end of the hollow main body; wherein, a winding track is formed between the upper ring part and the lower ring part, and the flexible clamping part protrudes from the inner peripheral wall to the through space to be coupled with the positioning shaft. Alternatively, the positioning shaft may include a positioning protrusion, the positioning protrusion is located on one side of the flexible card portion when the knob is located at the first position, and the positioning protrusion pushes the flexible card portion to deform and then locate on the other side of the flexible card portion when the knob is switched from the first position to the second position along the axial direction.

According to various embodiments of the fastening device, the housing unit may further include a limiting portion, the limiting portion is located in the upper accommodating chamber and connected to the partition portion, and the limiting portion limits the detent unit. Or, the shell unit may include a through hole located at the partition portion, the limiting portion includes four limiting arms surrounding the through hole at intervals, and a free end of each limiting arm limits the detent unit.

According to various embodiments of the fastening device, the knob may comprise a plurality of first driving teeth, the detent unit comprises a plurality of first engaging teeth, the first driving teeth engage with the first engaging teeth when the knob is in the first position, and the first driving teeth are separated from the first engaging teeth when the knob is in the second position. Or, the knob may further include a cover body, a protruding column and a plurality of second driving teeth, the cover body covers the housing unit; the convex column is arranged on the cover body and extends into the through hole, and the plurality of second driving teeth are positioned at the far end of the convex column far away from the cover body and are coupled with the wire coil. Or, the knob may further include a cover body, a protruding column and a plurality of second driving teeth, the cover body covers the housing unit; the convex column is arranged on the cover body and corresponds to the through hole, and the plurality of second driving teeth are positioned at the far end of the convex column, which is far away from the cover body; the fastening device also comprises a planetary gear set, the planetary gear set comprises a sun gear and a plurality of planetary gears, and the sun gear is meshed with the second driving gear; the plurality of planet gears are arranged on the wire coil at intervals and are meshed with the sun gear; and the shell unit also comprises a plurality of planet internal teeth which are positioned in the lower chamber and are meshed with the plurality of planet gears.

According to another aspect of the present invention, a fastening device is provided, which includes a housing unit, a knob, and a detent unit, wherein the housing unit includes a sidewall and a plurality of engaging teeth, the sidewall surrounds to form a receiving space, and the plurality of engaging teeth protrude from the sidewall toward the receiving space. The knob can be covered on the shell unit; the braking unit is positioned in the accommodating space, corresponds to the meshing teeth and is selectively coupled with the knob. The knob is switched between a first position and a second position along an axial direction, the knob is coupled to the braking unit when located at the first position, the knob and the braking unit are made to move simultaneously, the braking unit is clamped with the at least one meshing tooth to prevent the knob from rotating towards a first direction, when located at the second position, the knob is far away from the braking unit and is separated from the braking unit, and the braking unit does not prevent the knob from rotating towards the first direction.

According to a plurality of embodiments of the fastening device, the fastening device may further include a wire coil and a positioning shaft, the wire coil is limited in the accommodating space and includes a flexible clamping portion, the positioning shaft is disposed through the wire coil to be coupled with the flexible clamping portion, the positioning shaft has an axial direction, and the positioning shaft is linked by a knob, wherein the knob is coupled with the wire coil when located at the first position.

Drawings

FIG. 1 is a perspective view of a fastening device according to an embodiment of the present invention;

FIG. 2 illustrates an exploded view of the fastening device of FIG. 1;

FIG. 3 illustrates another exploded view of the fastening device of FIG. 1;

FIG. 4 is a schematic cross-sectional view of the fastening device of FIG. 1;

FIG. 5 depicts another cross-sectional schematic view of the fastening device of FIG. 1;

FIG. 6 is a perspective view of a fastening device according to another embodiment of the present invention;

FIG. 7 illustrates an exploded view of the fastening device of FIG. 6;

FIG. 8 illustrates another exploded view of the fastening device of FIG. 6;

FIG. 9 is a schematic cross-sectional view of the fastening device of FIG. 6; and

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

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings. For the purpose of clarity, numerous implementation details are set forth in the following description. However, the reader should understand that these implementation details should not be used to limit the invention. That is, in some embodiments of the invention, these implementation details are not necessary. In addition, for the sake of simplicity, some conventional structures and elements are shown in the drawings in a simple schematic manner; and repeated elements will likely be referred to using the same reference number or similar reference numbers.

In addition, when an element (or a mechanism or module, etc.) is "connected," "disposed" or "coupled" to another element, it can be directly connected, disposed or coupled to the other element, or it can be indirectly connected, disposed or coupled to the other element, that is, there are other elements between the element and the other element. When an element is explicitly connected, directly disposed, or directly coupled to another element, it is intended that no other element is interposed between the element and the other element. The terms first, second, third, etc. are used merely to describe various elements or components, but the elements/components themselves are not limited, so that the first element/component can be also referred to as the second element/component. And the combination of elements/components/mechanisms/modules herein is not a commonly known, conventional or known combination in the art, and cannot be readily determined by one of ordinary skill in the art based on whether the elements/components/mechanisms/modules are known per se.

Referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, wherein fig. 1 is a schematic perspective view illustrating a fastening device 100 according to an embodiment of the present invention, fig. 2 is an exploded view illustrating the fastening device 100 of fig. 1, fig. 3 is another exploded view illustrating the fastening device 100 of fig. 1, fig. 4 is a schematic cross-sectional view illustrating the fastening device 100 of fig. 1, and fig. 5 is another schematic cross-sectional view illustrating the fastening device 100 of fig. 1. The fastening device 100 includes a housing unit 200, a reel 300, a positioning shaft 600, a knob 500, and a stopper unit 400.

The housing unit 200 includes a sidewall 220 and a plurality of engaging teeth 240, the sidewall 220 surrounds to form a receiving space (not shown), and the plurality of engaging teeth 240 protrude from the sidewall 220 toward the receiving space. The knob 500 is covered on the shell unit 200 and connected with the positioning shaft 600; the pulling unit 400 is located in the accommodating space, and the pulling unit 400 corresponds to the engaging teeth 240 and is selectively coupled to the knob 500. One of the knob 500 and the housing unit 200 includes a plurality of engaging teeth 240 (in this embodiment, the housing unit 200 includes a plurality of engaging teeth 240) corresponding to the detent unit 400, the knob 500 is switched between a first position and a second position along an axial direction I1, when the knob 500 is located at the first position, the knob 500 is coupled to the detent unit 400, the knob 500 and the detent unit 400 move together, the detent unit 400 is engaged with at least one of the engaging teeth 240 to prevent the knob 500 from rotating in a first direction R1, when the knob 500 is located at the second position, the knob 500 is away from the detent unit 400 and is separated from the detent unit 400, and the detent unit 400 does not prevent the knob 500 from rotating in the first direction R1.

Therefore, only when the knob 500 is displaced along the axial direction I1, the detent unit 400 remains in the original position, thereby increasing the structural reliability. Details of the fastening device 100 will be described in more detail later.

The housing unit 200 may include the sidewall 220, a partition 230 and the plurality of engagement teeth 240, the partition 230 radially protrudes from the sidewall 220 to divide the accommodating space into an upper chamber S11 and a lower chamber S12, the plurality of engagement teeth 240 are located in the upper chamber S11, and the detent unit 400 is located in the upper chamber S11 to correspond to the engagement teeth 240. More specifically, the housing unit 200 may further include a bottom chassis 210, the sidewall 220 may include an upper peripheral wall 221 and a lower peripheral wall 222, the lower peripheral wall 222 is fixed to the bottom chassis 210, the partition 230 is connected to a lower edge of the upper peripheral wall 221, the sidewall 220 may further include four positioning portions 223 and four positioning holes 224, each positioning portion 223 protrudes downward from a lower edge of the upper peripheral wall 221, and each positioning hole 224 is located in the lower peripheral wall 222 and allows each positioning portion 223 to be embedded. Therefore, after the positioning portions 223 are engaged with the positioning holes 224, the bottom plate 210, the lower wall 222 and the partition 230 surround the lower chamber S12, and the upper wall 221 and the partition 230 surround the upper chamber S11.

The housing unit 200 may further include a limiting portion 250, the limiting portion 250 is located in the upper chamber S11 and connected to the partition portion 230, and the limiting portion 250 limits the detent unit 400. Through the action of the limiting part 250, the braking unit 400 can be limited in the upper chamber S11 to avoid being separated from the housing unit 200. Preferably, the housing unit 200 may include a through hole 260, the through hole 260 is located at the partition portion 230, the limiting portion 250 includes four limiting arms 251, the four limiting arms 251 are spaced around the through hole 260, and a free end 2511 of each limiting arm 251 limits the detent unit 400. The through hole 260 penetrates through the center of the partition 230 along the axial direction I1 to communicate the lower chamber S12 with the upper chamber S11, and the four retaining arms 251 protrude upward from the partition 230 adjacent to the through hole 260 along the axial direction I1 and form a free end 2511 with a radial lip structure. Therefore, the braking unit 400 can be placed into the upper chamber S11 from top to bottom along the axial direction I1, the four limiting arms 251 are radially deformed to pass through a central hole (not labeled) of the braking unit 400 after being pressed, and after the braking unit 400 is completely placed into the upper chamber S11, the four limiting arms 251 are reset and the free ends 2511 limit the braking unit 400, so as to limit the braking unit 400.

The fastening device 100 may further include a wire coil 300 and a positioning shaft 600, the wire coil 300 is limited in the accommodating space and includes a flexible clamping portion 340, the positioning shaft 600 is disposed through the wire coil 300 to couple with the flexible clamping portion 340, the positioning shaft 600 has an axial direction I1, and the positioning shaft 600 is linked by the knob 500, wherein the knob 500 is coupled with the wire coil 300 when located at the first position. Therefore, when the knob 500 is located at the first position, it is coupled to the detent unit 400, and the detent unit 400 is engaged with the at least one engagement tooth 240 in the first direction R1 to prevent the wire coil 300 from rotating in the first direction R1; on the contrary, when the knob 500 is located at the second position, the knob 500 is separated from the stopping unit 400, so that the stopping unit 400 does not prevent the wire coil 300 from rotating in the first direction R1.

The wire coil 300 may include a hollow main body 310, an upper ring portion 320 and a lower ring portion 330, the hollow main body 310 includes an inner peripheral wall 311 surrounding a through space T2 for the positioning shaft 600 to pass through, the upper ring portion 320 protrudes radially outward from one end (not labeled) of the hollow main body 310, and the lower ring portion 330 protrudes radially outward from the other end of the hollow main body 310; a winding track T1 is formed between the upper ring portion 320 and the lower ring portion 330, and the flexible card portion 340 protrudes from the inner peripheral wall 311 toward the through space T2 to be coupled to the positioning shaft 600. In addition, the positioning shaft 600 may include a positioning protrusion 610, when the knob 500 is located at the first position, the positioning protrusion 610 is located at one side of the flexible card portion 340, and when the knob 500 is switched from the first position to the second position along the axial direction I1, the positioning protrusion 610 pushes the flexible card portion 340 to deform and then locate at the other side of the flexible card portion 340.

Specifically, the inner circumferential wall 311 includes an upper radial section 3112 and a lower radial section 3111, the upper radial section 3112 has a straight surface area (not labeled) and a slant surface area (not labeled), the straight surface area connects with the slant surface area, the slant surface area connects with the lower radial section 3111, the flexible locking portion 340 includes four locking arms 341 protruding from the slant surface area toward the through space T2 and forming a locking end 3411 with a radial lip structure. The positioning shaft 600 further includes a bottom 620 and a shaft 630, the shaft 630 is disposed on the bottom 620, and the positioning protrusion 610 is located on the shaft 630, so that the positioning shaft 600 can enter the through space T2 from bottom to top and be engaged with the flexible locking portion 340, and the bottom 620 is limited on the lower diameter section 3111. The fastening device 100 may further include a screw 700, and the screw 700 may be used to connect the positioning shaft 600 and the knob 500, so that the positioning shaft 600 and the knob 500 move together.

When the knob 500 drives the positioning shaft 600 to move upward along the axial direction I1, the positioning protrusion 610 pushes the four-detent arm 341 to deform the four-detent arm 341 radially, the positioning protrusion 610 moves from the one side of the flexible detent portion 340 to the other side, and the four-detent arm 341 resets to maintain the knob 500 at the second position.

The winding rail T1 may be used for winding a tie line (not shown), and the housing unit 200 may further include two wire holes 270, the two wire holes 270 are located on the lower wall 222, the wire holes 270 may communicate with the lower chamber S12, so that the tie line may pass through the two wire holes 270 and enter and exit the lower chamber S12 to be released or wound on the winding rail T1.

The knob 500 may include a plurality of first driving teeth 540, and the detent unit 400 includes a plurality of first coupling teeth 410, the first driving teeth 540 being engaged with the first coupling teeth 410 when the knob 500 is located at the first position, and the first driving teeth 540 being disengaged from the first coupling teeth 410 when the knob 500 is located at the second position. In addition, the knob 500 may further include a cover 510, a boss 520, and a plurality of second driving teeth 530, wherein the cover 510 covers the housing unit 200; the protruding column 520 is disposed on the cover 510 and extends into the through hole 260, and the plurality of second driving teeth 530 are disposed at a distal end of the protruding column 520 far from the cover 510 to couple to the wire coil 300.

The cover 510 of the knob 500 includes an inner top surface (not labeled), the protruding pillar 520 protrudes from the inner top surface in a direction away from the inner top surface, the second driving tooth 530 is located on the outer peripheral surface of the protruding pillar 520, and the plurality of first driving teeth 540 are located on the inner top surface and surround the protruding pillar 520. The stopping unit 400 may include a hollow ring 430, a plurality of first coupling teeth 410 are disposed at an upper end of the hollow ring 430, and when the cover 510 is assembled to the housing unit 200, the first driving teeth 540 are correspondingly engaged with the first coupling teeth 410, and the protruding pillar 520 may extend into the through hole 260, such that the second driving teeth 530 are coupled with a plurality of second coupling teeth (not shown) disposed at the upper diameter section 3112, and the knob 500 is coupled to the wire coil 300.

In this embodiment, the detent unit 400 further includes a plurality of ratchet arms 420, each ratchet arm 420 protrudes outward from each hollow ring 430, and the ratchet arms 420 engage with at least one engaging tooth 240 in the first direction R1, so that the detent unit 400 cannot rotate in the first direction R1; conversely, each ratchet arm 420 is continuously separated from the engaging tooth 240 in a second direction R2 opposite to the first direction R1, so that the detent unit 400 can rotate relative to the housing unit 200 in the second direction R2.

As shown in fig. 4, when the knob 500 is located at the first position, the first driving tooth 540 of the knob 500 is engaged with the first engaging tooth 410 of the detent unit 400, and the second driving tooth 530 of the knob 500 is engaged with the second engaging tooth of the wire reel 300, so that when the user rotates the knob 500 in the second direction R2, the ratchet arm 420 is continuously separated from the engaging tooth 240, and the knob 500 can drive the wire reel 300 to take up the wire; on the contrary, when the user releases the knob 500, the ratchet arm 420 engages with the at least one engaging tooth 240, and the rotation of the knob 500 is limited by the detent unit 400, and the wire coil 300 is prevented from rotating in the first direction R1, thereby achieving the fastening effect.

As shown in fig. 5, when the user wants to release the wire tying, the user can pull the knob 500 upward along the axial direction I1, at which time the first driving tooth 540 of the knob 500 is separated from the first engaging tooth 410 of the brake unit 400 and the second driving tooth 530 of the knob 500 is also separated from the second engaging tooth of the wire coil 300, so that the rotation of the knob 500 and the wire coil 300 is not limited by the brake unit 400. In other embodiments, the second driving tooth of the knob may not be separated from the second coupling tooth of the wire coil when the knob is located at the second position, which is not limited thereto.

Referring to fig. 6, 7, 8, 9 and 10, wherein fig. 6 is a perspective view of a fastening device 100a according to another embodiment of the present invention, fig. 7 is an exploded view of the fastening device 100a of fig. 6, fig. 8 is an exploded view of the fastening device 100a of fig. 6, fig. 9 is a cross-sectional view of the fastening device 100a of fig. 6, and fig. 10 is a cross-sectional view of the fastening device 100a of fig. 6. The structure of the fastening device 100a is similar to that of the fastening device 100 of fig. 1 to 5, but the wire coil 300a is coupled to the knob 500a in a different manner.

More specifically, the knob 500a may further include a cover 510a, a boss 520a and a plurality of second driving teeth 530a, the cover 510a covering the housing unit 200 a; the protruding pillar 520a is disposed on the cover 510a and corresponds to the through hole (not labeled), and the plurality of second driving teeth 530a are disposed at a distal end of the protruding pillar 520a away from the cover 510 a; the fastening device 100a further includes a planetary gear set 800a, the planetary gear set 800a includes a sun gear 810a and a plurality of planet gears 820a (four planet gears 820a are included in the embodiment), the sun gear 810a is engaged with the second driving tooth 530 a; a plurality of planetary gears 820a are disposed at intervals on the drum 300a and are engaged with the sun gear 810 a; and the housing unit 200a further includes a plurality of planetary inner teeth 280a located in the lower compartment S12 and engaging the plurality of planetary gears 820 a.

The stud 520a has a recess (not shown) at the distal end thereof, the second drive tooth 530a is located in the recess, the sun gear 810a is engaged with the recess to engage with the second drive tooth 530a, and the drum 300a includes four pivots 350a for pivoting the four planetary gears 820 a.

The partition 230a of the housing unit 200a may protrude inward from a middle portion of the upper wall 221a, and the partition 230a is used as a boundary, an upper half region of the upper wall 221a forms the upper chamber S11, a lower half region of the upper wall 221a forms the lower chamber S12 together with the lower wall 222a and a chassis (not labeled), and the planetary inner teeth 280a may be disposed in the lower half region of the upper wall 221 a. When knob 500a is turned, second drive teeth 530a drive sun gear 810a, and planet gears 820a are rotationally displaced along inner planet teeth 280a by sun gear 810a to rotate drum 300 a.

Therefore, as shown in fig. 9, when the knob 500a is located at the first position, the first driving tooth 540a of the knob 500a is engaged with the first engaging tooth 410a of the detent unit 400a, and the second driving tooth 530a of the knob 500a is engaged with the planetary gear set 800a, so that when the knob 500a is rotated by the user in the second direction, the ratchet arm 420a is continuously separated from the engaging tooth 240a, and the knob 500a can drive the wire coil 300a to take up the wire; on the contrary, when the user releases the knob 500a, the ratchet arm 420a is engaged with the at least one engaging tooth 240a, and the rotation of the knob 500a is restricted by the stopping unit 400a, and the wire coil 300a is prevented from rotating in the first direction, thereby achieving the fastening effect.

As shown in fig. 10, when the user wants to release the wire tying, the knob 500a can be pulled up in the axial direction, and the first driving tooth 540a of the knob 500a is separated from the first engaging tooth 410a of the detent unit 400a, so that the rotation of the knob 500a and the wire coil 300a is not limited by the detent unit 400a, and the knob 500a and the wire coil 300a maintain the coupling relationship because the sun gear 810a is still engaged with the planetary gear 820 a.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A fastening device, comprising:

a housing unit, comprising: a side wall surrounding to form a containing space; a partition part radially protruding from the side wall to divide the accommodating space into an upper accommodating chamber and a lower accommodating chamber; and a plurality of engaging teeth located in the upper chamber;

a wire coil located in the lower chamber and including a flexible clamping part;

a positioning shaft, which is arranged through the wire coil to be coupled with the flexible clamping part and is provided with an axial direction;

The knob is covered on the shell unit and connected with the positioning shaft; and

the braking unit is positioned in the upper accommodating chamber, corresponds to the plurality of meshing teeth and is selectively coupled with the knob;

when the knob is located at the second position, the knob is separated from the braking unit, and the braking unit does not prevent the wire coil from rotating towards the first direction.

2. The fastening device of claim 1, wherein the wire coil comprises:

a hollow main body, which comprises an inner peripheral wall surrounding to form a through space for the positioning shaft to pass through;

an upper ring part, which protrudes outwards from one end of the hollow main body in the radial direction; and

a lower ring part protruding outward from the other end of the hollow main body in a radial direction;

wherein, a winding track is formed between the upper ring part and the lower ring part, and the flexible clamping part protrudes from the inner peripheral wall to the through space to be coupled with the positioning shaft.

3. The fastening device according to claim 2, wherein the positioning shaft includes a positioning protrusion, the positioning protrusion is located on one side of the flexible locking portion when the knob is located at the first position, and the positioning protrusion pushes the flexible locking portion to deform and then locate on the other side of the flexible locking portion when the knob is switched from the first position to the second position along the axial direction.

4. The fastening device according to claim 1, wherein the housing unit further comprises a limiting portion, the limiting portion is located in the upper chamber and connected to the partition portion, and the limiting portion limits the stopper unit.

5. The fastening device of claim 4, wherein the housing unit comprises a through hole located in the partition portion, the limiting portion comprises four limiting arms spaced around the through hole, and a free end of each limiting arm limits the stopper unit.

6. The fastening device of claim 5, wherein the knob includes a first plurality of driving teeth, the detent unit includes a first plurality of engaging teeth, the first plurality of driving teeth engage the first plurality of engaging teeth when the knob is in the first position, and the first plurality of driving teeth disengage from the first plurality of engaging teeth when the knob is in the second position.

7. The fastening device of claim 6, wherein the knob further comprises:

a cover body covering the housing unit;

a convex column which is arranged on the cover body and extends into the through hole; and

and the plurality of second driving teeth are positioned at the far end of the convex column far away from the cover body so as to be coupled with the wire coil.

8. The fastening device according to claim 6,

the knob further comprises: a cover body covering the housing unit; a convex column which is arranged on the cover body and corresponds to the through hole; the second driving teeth are positioned at the far end of the convex column far away from the cover body;

the fastening device further comprises a planetary gear set comprising: a sun gear engaged with the plurality of second driving teeth; the planetary gears are arranged on the wire coil at intervals and are meshed with the sun gear; and is

The housing unit further comprises: and the planetary internal teeth are positioned in the lower accommodating chamber and are meshed with the planetary gears.

9. A fastening device, comprising:

a housing unit, comprising: a side wall surrounding to form a containing space; and a plurality of engaging teeth protruding from the side wall toward the accommodating space;

a knob covering the housing unit; and

The braking unit is positioned in the accommodating space, corresponds to the plurality of meshing teeth and is selectively coupled with the knob;

when the knob is located at the second position, the knob is far away from the braking unit and is separated from the braking unit, and the braking unit does not prevent the knob from rotating towards the first direction.

10. The fastening device of claim 9, further comprising:

a wire coil which is limited in the containing space and comprises a flexible clamping part; and

a positioning shaft, which is arranged through the wire coil to be coupled with the flexible clamping part, has the axial direction and is linked by the knob;

wherein the knob is coupled to the spool when in the first position.

11. A fastening device according to claim 10, wherein the wire coil comprises:

12. The fastening device according to claim 11, wherein the positioning shaft includes a positioning protrusion, the positioning protrusion is located on one side of the flexible locking portion when the knob is located at the first position, and the positioning protrusion pushes the flexible locking portion to deform and then locate on the other side of the flexible locking portion when the knob is switched from the first position to the second position along the axial direction.