KR101572605B1 - String winding and unwinding apparatus - Google Patents

Abstract

The present invention provides an apparatus for winding and unwinding a string, which has a simple structure and can be maintained and repaired in an easy manner. The apparatus includes: (i) a base unit having a base plate and a lower housing, which is is located on an upper side of the base plate and is in the shape of a cylinder; (ii) a middle unit having an upper housing in the shape of a cylinder, and an upper hanging unit and a lower hanging unit which are located in the upper housing; (iii) a rotation unit of which at least a portion is located in the lower housing to be rotatable with respect to the base unit; and (iv) a cover unit which is joined to the middle unit to be rotatable with respect to the middle unit, has a corresponding hanging unit, can be engaged with the rotation unit or can be separated from the rotation unit as the distance from the base unit is varied, and can be rotated with the rotation unit when engaged with the rotation unit.

Description

Technical Field [0001] The present invention relates to a string winding and unwinding apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a string winding and unwinding apparatus, and more particularly, to a string winding and unwinding apparatus that is simple in construction and easy to maintain.

In general, shoes, bags, backpacks, clothes and the like are provided with tightening / unfastening means using strings or the like. For example, in the case of a shoe, the string is mounted so as to be connected in a zigzag fashion, and by pulling such a string, the shoe can be brought into close contact with the user's foot.

However, since it is very cumbersome to loosen or tighten the string every time you take off your shoes, it is common to wear the shoes without tightening the strings to prevent them from coming into close contact with your feet. In this case, when the shoe is completely brought into close contact with the user's foot for exercise or the like, the string is pulled again and then loosened again to loosen the string. In addition, there is a disadvantage that when the string is loosened during walking or during exercise, the string is bound again.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and provide a string winding and unwinding apparatus which is simple in construction and easy to maintain. However, these problems are exemplary and do not limit the scope of the present invention.

According to one aspect of the present invention, there is provided an air conditioner comprising: (i) a base unit having a base plate and a cylinder-shaped lower housing located on an upper surface of the base plate and having side through holes; (ii) And a lower engaging portion located on the inner side of the upper housing and positioned closer to the base plate than the upper engaging portion; and (iii) a middle unit having a lower engaging portion located on the inner side of the upper housing, A rotary unit, at least a part of which is located inside the lower housing so as to be rotatable with respect to the base unit, and in which the string can be wound on the outer circumferential surface or can be unwound from the outer circumferential surface by rotation, and (iv) And a corresponding engaging portion coupled to the middle unit and projecting in a radial direction, wherein the upper engaging portion and the lower engaging portion of the corresponding engaging portion, And a cover unit that can be rotated together with the rotation unit when the rotation unit is engaged with the rotation unit. A string winding and unwinding device is provided.

The upper latching part and the lower latching part may be located in the upper housing.

The middle unit may further include a hook supporting portion extending and bent inward from the upper housing such that a space exists between the upper housing and the inner circumferential surface of the upper housing, And may be located on a surface in a direction away from the upper housing.

The middle unit may further include a latching portion extending inwardly from the upper housing and bent a plurality of times so that a space exists between the middle unit and the inner circumferential surface of the upper housing, The upper and lower latching portions may be convex portions of the latching support portion. The upper latching portion and the lower latching portion may be convex portions of the latching support portion.

The middle unit further includes a flexure which is coupled to the upper housing and is bent a plurality of times so that a space exists between the inner circumference of the upper housing and the inner circumference of the upper housing, The upper latching portion and the lower latching portion may be convex portions of the flexure, wherein the upper latching portion and the lower latching portion are convex portions such that at least two convex portions are present in a direction away from the upper housing.

Wherein the upper latching portion and the lower latching portion have a convex shape in a direction away from the inner circumferential surface of the upper housing, and the corresponding latching portion is located in the first space below the lower latching portion or between the upper latching portion and the lower latching portion The distance from the base unit of the cover unit can be variable as the cover unit is located in the second space and can be rotated together with the rotation unit when the corresponding locking unit is located in the first space, And may be spaced apart from the rotating unit when the corresponding latching portion is located in the second space.

At this time, the distance between the base plate and the second portion of the upper engagement portion, which is farther from the upper housing, than the distance between the first portion of the upper engagement portion adjacent to the upper housing and the base plate may be shorter.

Meanwhile, the upper latching part and the lower latching part may have a concave shape.

At least a part of the corresponding latching portion can be flexible.

The cover unit has a central shaft having a groove formed on the outer surface thereof, and the corresponding engaging portion can be engaged with the groove of the central shaft.

The cover unit may have a unidirectional ratchet protrusion, and the middle unit may have a corresponding protrusion that can be engaged with the ratchet protrusion therein.

When the cover unit is engaged with the rotation unit, the ratchet projection and the corresponding projection engage with each other, and when the cover unit is separated from the rotation unit, the ratchet projection and the corresponding projection may be spaced apart from each other.

The middle unit may be located closer to the base plate than the lower engaging portion, and may have a partition wall protruding inward, and the corresponding projection may be positioned on a face of the partition wall in the direction toward the lower engaging portion.

The middle unit may be located closer to the base plate than the lower engaging portion and have inwardly protruding partitions, and the corresponding protrusions may be located on the inboard side of the partition toward the center of the upper housing.

The base unit may further include a clip portion corresponding to the base plate, the clip portion extending from the base plate such that a space exists between the base plate and the base plate.

The base unit may further include a rail located on a lower surface of the base plate and extending in one direction.

According to an embodiment of the present invention as described above, it is possible to implement a string winding and unwinding apparatus that is simple in structure and easy to maintain. Of course, the scope of the present invention is not limited by these effects.

1 is an exploded perspective view schematically showing a string winding and winding apparatus according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view schematically showing the combined state of the string winding and unwinding apparatus of FIG. 1;
Figure 3 is a perspective view schematically showing the base unit of Figure 1;
4 is a perspective view schematically showing the middle unit of Fig.
Fig. 5 is a perspective view schematically showing the rotating unit of Fig. 1;
Fig. 6 is a bottom perspective view schematically showing the rotating unit of Fig. 5; Fig.
7 is a bottom perspective view schematically showing the cover unit of Fig.
Figure 8 is a cross-sectional view of a portion of the string winding and unwinding device of Figure 1;
9 is a cross-sectional view of a part of a string winding and unwinding apparatus according to another embodiment of the present invention.
10 is a cross-sectional view of a portion of a string winding and unwinding apparatus according to another embodiment of the present invention.
11 is a cross-sectional view of a part of a string winding and unwinding apparatus according to another embodiment of the present invention.
12 is a cross-sectional view of a portion of a string winding and unwinding apparatus according to another embodiment of the present invention.
13 is a cross-sectional view of a part of a string winding and winding device according to another embodiment of the present invention.
14 is a perspective view schematically showing a middle unit of a string winding and winding device according to another embodiment of the present invention.
Figure 15 is a cross-sectional view of a portion of a cover unit that can be used with the middle unit of Figure 14;
16 is a perspective view schematically showing a shoe according to another embodiment of the present invention.
17 is a perspective view schematically showing a string winding and winding device according to another embodiment of the present invention.
18 is a perspective view schematically showing a string winding and unwinding apparatus according to another embodiment of the present invention.
Fig. 19 is a perspective view schematically showing a fastening clip that can be engaged with the string winding and unwinding device of Fig. 18; Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Also, for convenience of explanation, the components may be exaggerated or reduced in size. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

In the following embodiments, the x-axis, the y-axis, and the z-axis are not limited to three axes on the orthogonal coordinate system, and can be interpreted in a broad sense including the three axes. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but may refer to different directions that are not orthogonal to each other.

On the other hand, when various elements such as layers, films, regions, plates and the like are referred to as being "on " another element, not only is it directly on another element, .

FIG. 1 is an exploded perspective view schematically showing a string winding and winding device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view schematically showing a combined state of the string winding and winding device of FIG.

As shown in Figs. 1 and 2, the string winding and unwinding apparatus according to the present embodiment includes a base unit 100, a middle unit 200 coupled to the base unit, A rotating unit 300 positioned in the unit 100 and / or the middle unit 200 and a cover unit 400 coupled to the middle unit 200 so as to be rotatable with respect to the middle unit 200.

3 is a perspective view schematically showing the base unit 100 of FIG. 3, the base unit 100 has, for example, a base plate 110 having a shape like a disk and a lower housing 120 in a cylindrical shape. Of course, the shape of the base plate 110 is not limited to the circular plate, and it may have a plate shape of various shapes. Here, the cylinder shape can be understood as a shape similar to a hollow cylinder. This lower housing 120 is located on the upper surface of the base plate 110 in the (+ z direction). The base plate 110 and the lower housing 120 may be integrally formed of resin or the like.

The lower housing 120 has a second side through hole 122. Of course, the lower housing 120 may have a first side through hole 121 as shown in FIG. 3, if necessary. In this case, the first side through hole 121 may be positioned closer to the base unit 100 than the second side through hole 122. The lower housing 120 may have two first side through holes 121 and two second side through holes 122 so as to face each other. 3, the first side through holes 121 are located on the straight line in the y-axis direction and the second side through holes 122 are also located on the straight line in the y-axis direction. However, this is only an example, The functions can be exerted even if they are aligned on the surface. 3, the first through-hole 121 and the second through-hole 122 are vertically aligned. However, the present invention is not limited thereto. For example, the first side through holes 121 are located on a straight line in the y-axis direction as shown in Fig. 3, and the second side through holes 122 are located on a straight line in the x- .

The through holes 111 having a center axis in the z-axis direction may be formed on the outer portion of the lower housing 120 of the base plate 110 of the base unit 100. The through holes 111 are for allowing the fasteners for fixing the base plate 110 to be fixed to shoes or the like to pass therethrough when the string winding and wringing apparatus according to the present embodiment is mounted on, for example, shoes.

The base unit 100 may further have a rotation support portion 130 protruding from the inner surface of the lower housing 120 toward the center of the lower housing 120. A rotation support protrusion 132 protruding upward (in the + z direction) may be formed on the upper surface of the rotation support part 130. The rotation support portion 130 and the rotation support protrusion 132 can support the rotation of the rotation unit 300 when the rotation unit 300 rotates with respect to the base unit 100 so that the rotation can be smoothly performed. This will be described later.

As described above, the middle unit 200 to be described later may be coupled to the base unit 100. For this purpose, for example, as shown in FIGS. 1 to 3 and the like, an outer surface of the lower housing 120 of the base unit 100 A screw thread may be formed on at least a part of the surface. At least a part of the inner surface of the middle unit 200 is formed with a threaded screw corresponding to such a thread, so that the middle unit 200 and the base unit 100 can be screwed together. The cover unit 400 engaged with the rotation unit 300 is rotated in order to wind a string of shoes or the like on the outer circumferential surface of the rotation unit 300 as described later. 200 and the base unit 100 from separating from each other. When the cover unit 400 engaged with the rotation unit 300 is rotated in one direction to wind the string of shoes or the like on the outer circumferential surface of the rotation unit 300, It is preferable that the screwing of the unit 100 is not the unlocking direction but the locking direction. Of course, this is an illustrative example, and the middle unit 200 and the base unit 100 may be coupled with each other using a projection or the like.

As shown in FIG. 4, the middle unit 200 has a cylindrical upper housing 210, an upper fastening portion 221, and a lower fastening portion 222. The upper latching portion 221 and / or the lower latching portion 222 may have flexibility or flexibility somewhat within a range in which the overall shape thereof does not largely change. The cylindrical upper housing 210, which can be understood as a hollow cylindrical shape, can be coupled to the lower housing 120 of the base unit 100. The upper latching portion 221 and the lower latching portion 222 may be located on the inner circumferential surface 210a of the upper housing 210 which is the center of the upper housing 210. [ The upper engaging portion 221 and the lower engaging portion 222 may have a convex shape in a direction away from the inner circumferential surface 210a of the upper housing 210. [ That is, both the upper latching portion 221 and the lower latching portion 222 may have a convex shape protruding toward the center of the upper housing 210. At this time, the lower engaging portion 222 is located closer to the base plate 110 (in the -z direction) than the upper engaging portion 221.

The middle unit 200 may also have a partition 240 that is positioned closer to the base plate 110 than the lower portion 222 and is spaced apart from the upper housing 210 As shown in Fig. The corresponding protrusion 250 may be positioned on the surface of the partition 240 in the direction of the lower engaging portion 222 (+ z direction). The function of the partition 240 and / or the corresponding projection 250 will be described later.

The upper housing 210, the upper latching part 221, the lower latching part 222, the partition 240 and the corresponding protrusion 250 may be integrally formed of resin or the like. Of course, as will be described later, some of the components may be connected to the upper housing 210 or the like as separate components separated from the upper housing 210 and the like, and in this case, some of such components may be formed of resin, metal, or the like .

Fig. 5 is a perspective view schematically showing the rotation unit 300 of Fig. 1, and Fig. 6 is a bottom perspective view schematically showing the rotation unit 300 of Fig. The rotating unit 300 is located inside the lower housing 120 of the base unit 100 and is rotatably disposed with respect to the base unit 100 as shown in Figs. Here, the rotation unit 300 is positioned inside the lower housing 120, meaning that at least a part of the rotation unit 300 is located inside the lower housing 120, and a part of the rotation unit 300 is located in the lower housing 120 And may be located within the upper housing 210 at the upper portion.

The rotating unit 300 has a first engaging part 310 on the upper surface (+ z direction) as shown in Fig. In FIG. 5, the first engaging part 310 is shown as a concave groove, but it may be a convex protruding shape or the like. When the first engaging portion 310 is engaged with the second engaging portion 450 of the cover unit 400 described later, the rotation unit 300 can be rotated together with the cover unit 400. [ In order to prevent the rotation unit 300 and the cover unit 400 from being idle with respect to each other in spite of the mutual engagement of the first engaging portion 310 and the second engaging portion 450, The shape of the first engaging portion 310 and the second engaging portion 450 in the xy plane may have various shapes such as a polygonal shape, an elliptical shape, or an asymmetrically distorted circle. Or the shape of the first engaging portion 310 and the second engaging portion 450 in the xy plane may be a configuration of a pair of at least one pin and a plurality of pin holes, And the cover unit 400 can be engaged with each other.

5 and 6, the rotation unit 300 includes a first wing portion 321 protruding in a radial direction and a second wing portion 321 protruding in a radial direction from the base plate 110, (In the -z direction) and may have a second wing portion 322 protruding in the radial direction similar to the first wing portion 321. In the space between the first wing portion 321 and the second wing portion 322, a string may be wound around the outer circumferential surface of the rotation unit 300 according to the rotation direction of the rotation unit 300. That is, the first wing portion 321 and the second wing portion 322 may define a space in which the wound string is to be positioned when the string is wound according to the rotation direction of the rotation unit 300.

6, the rotation unit 300 may be disposed at a lower position (in the -z direction) closer to the base plate 110 than the second wing portion 322, as shown in FIG. 6, 322 may be further provided with a third wing portion 323 protruding in the radial direction. The lower surface of the third wing portion 323 is flat so that at least a portion of the lower surface of the third wing portion 323 contacts the upper surface of the base plate 110 in the (+ z direction) Or the rotation unit 300 can be stably rotated with respect to the base plate 110 in a state of being close to the near side even if not in contact with the base plate 110. [

The rotation unit 300 may have a first through hole 331 located below the (-z direction) of the second wing portion 322 and passing through the rotation unit 300 as shown in FIG. The first through holes 331 may correspond to the first side through holes 121 of the base unit 100. The reason that the first through hole 331 corresponds to the first side through holes 121 is that the height of the first through hole 331 from the base plate 110 and the height of the first side through hole 331 from the base plate 110, (121) are approximately equal in height.

An elastic body (not shown) such as a restoring string having elasticity can pass through the first through hole 331 of the rotation unit 300. Further, both ends of the elastic body pass through the first side through holes 121 And can be fixed to the base unit 100. For example, both ends of the restoration string may be tied to each other outside the base unit 100. Thus, the restoration string can be fixed to the base unit 100 through the first through-hole 331 of the rotation unit 300 through various methods. Accordingly, when the rotary unit 300 is engaged with the cover unit 400 and rotated in one direction so that a string of shoes or the like is wound around the outer circumferential surface of the rotary unit 300, the elastic restoring string is also increased in length, (Not shown). Specifically, the restoration string can be wound in a space between the second wing portion 322 and the third wing portion 323. When the rotation unit 300 is separated from the cover unit 400 in such a state, the rotation unit 300 is rotated in the opposite direction of the one direction by the elasticity of restoring the restoring string, To be automatically rotated in the direction of the arrow. Of course, in addition to the restoring string, any elastic body may be used as the elastic body, for example, a tension spring, a spring spring, a elastic string such as a rubber string, or the like.

1 and 3, the base unit 100 has the first side through holes 121, but the present invention is not limited thereto. For example, the base unit 100 may have grooves or protrusions therein without having the first side through holes 121, and both ends of the elastic body such as a restoring string may be formed in grooves or protrusions in the base unit 100 It may be fixed. The other end of the restoration string is fixed to a groove or protrusion (not shown) of the rotation unit 300, for example, a groove or protrusion (not shown) of the third wing portion 323, .

The rotating unit 300 may have a second through hole 332 penetrating the rotating unit 300 in a space between the first wing portion 321 and the second wing portion 322 as shown in FIG. have. The second through holes 332 may correspond to the second side through holes 122 of the base unit 100. The reason that the second through holes 332 correspond to the second side through holes 122 is that the height of the second through holes 332 from the base plate 110 and the height of the second side through holes 332 from the base plate 110, (122) are approximately equal in height.

A string of shoes or the like passes through any one of the second side through holes 122 of the base unit 100 and passes through the second through hole 332 of the rotating unit 300, And can pass through the other of the two side through holes 122. Accordingly, when the rotary unit 300 is engaged with the cover unit 400 and rotated in one direction, the string is wound around the rotary unit 300. Specifically, the string is wound in a space between the first wing portion 321 and the second wing portion 322 of the rotation unit 300. Thus, a string of shoes or the like can be wound. At this time, the ratchet projection 460 and the corresponding projection 250 also meet, but the wedge shape of the ratchet projection 460 and the corresponding projection 250 allows the cover unit 400 to rotate in one direction, The rotation of the cover unit 400 and the rotation unit 300 in the other direction opposite to the rotation of the unit 400 when the rotation of the unit 400 in the one direction is stopped is restricted. When the rotation unit 300 is separated from the cover unit 400 in such a state, the ratchet projection 460 and the corresponding protrusion 250 are also spaced apart from each other, so that the rotation unit 300 can be restored to the restoring force of the elastic body, The string that has been wound around the rotary unit 300 can be unwound from the outer circumferential surface of the rotary unit 300. In this case,

Of course, the present invention is not limited thereto, and the rotation unit 300 may not have the second through hole 332. [ In this case, one end of a string of shoes or the like is fixed to the rotation unit 300 through one of the second side through holes 122 of the base unit 100, and the other end of the string of shoes, Through the other of the second side through holes 122 of the rotary unit 300. In this case, for fixing the one end and the other end of the string, the rotation unit 300 may have at least one fixing protrusion for string fixing.

The rotation unit 300 is relatively rotated with respect to the base unit 100 when it rotates, and it is desirable to improve the rotation stability of the rotation unit 300. The rotation support portion 130 and the rotation support protrusion 132 of the base unit 100 may interact with the second wing portion 322 of the rotation unit 300. [ The rotation unit 300 has a rotation protrusion 322a protruding downward (-z direction) to the radial end of the second wing portion 322 and a downward rotation (-z direction) of the second wing 322, A portion of the surface of the rotary unit 300 adjacent to the rotary projection 322a abuts against the rotary support projection 132 of the base unit 100 or comes into contact with the rotary support projection 132, 300 can be kept constant relative to the base unit 100 without moving.

The rotating unit 300 may be formed of resin and / or metal.

7 is a bottom perspective view schematically showing the cover unit 400 of FIG. 7, the cover unit 400 may be coupled to the middle unit 200 so as to be rotatable with respect to the middle unit 200. As shown in Fig. Of course, as described above, when the cover unit 400 is engaged with the rotation unit 300, the cover unit 400 can rotate in one direction together with the rotation unit 300. [

The cover unit 400 has a corresponding engagement portion 410 protruding in a radial direction. The corresponding engagement portion 410 of the cover unit 400 performs a mutual grasp action with the upper engagement portion 221 and / or the lower engagement portion 222 of the middle unit 200, (Not shown). The distance from the base unit 100 to the cover unit 400 varies depending on the relative positions of the upper latching portion 221 and the lower latching portion 222 of the corresponding latching portion 410, Or may be spaced from the rotating unit 300. [

Specifically, as the engaging portion 410 is located in the first space below the lower engaging portion 222 or in the second space between the upper engaging portion 221 and the lower engaging portion 222, 400 from the base unit 100 can be varied. The cover unit 400 can be rotated in one direction together with the rotation unit 300 by engaging with the rotation unit 300 so that the rotation of the rotation unit 300 can be prevented, The ratchet projection 460 and the corresponding protrusion 250 are spaced apart from each other as the cover unit 400 is separated from the rotation unit 300 so that the rotation unit 300 is separated from the cover unit 400, Can be rotated in the one direction or in the opposite direction, irrespective of the movement of the arm.

The cover unit 400 has the second engaging portion 450 on the lower surface in the direction of the rotation unit 300 (-z direction) as shown in FIG. Although the second engaging portion 450 is illustrated as being convexly protruding in FIG. 7, the second engaging portion 450 may be a concave groove or may be deformed according to the shape of the first engaging portion 310 of the rotation unit 300 to be. When the second engaging portion 450 is engaged with the first engaging portion 310 of the rotation unit 300 described above, the rotation unit 300 can be rotated together with the cover unit 400. In order to prevent the rotation unit 300 and the cover unit 400 from being idle with respect to each other in spite of the mutual engagement of the first engaging portion 310 and the second engaging portion 450, The shape of the first engaging portion 310 and the second engaging portion 450 in the xy plane may have various shapes such as a polygonal shape, an elliptical shape or an asymmetrically distorted circle, and may have a structure of a pin and a pin hole.

7, it is understood that the cover unit 400 is a disc-shaped end portion extending in the radial direction from the center shaft 430, . The cover plate 420 may be positioned above the center axis 430 in the + z direction. The side plate 440, which can be understood as a portion bent at an angle of about 90 degrees from the edge of the cover plate 420, is formed as shown in FIG. 2 when the cover unit 400 is coupled to the middle unit 200 It is possible to cover at least a part of the outer peripheral portion of the middle unit 200. In FIG. 2, the side plate 440 covers most of the outer circumferential surface of the upper housing 210 of the middle unit 200.

The various components of the cover unit 400 may be integrally formed of resin and / or metal. Of course, as will be described below, some of the components may be coupled to the center shaft 430 or the like as separate components separated from the central shaft 430 or the like, and in this case, some of such components may be formed of resin, metal, or the like .

In the case of the string winding and unwinding apparatus according to this embodiment, as described above, when the corresponding latching portion 410 is located in the first space below the lower latching portion 222, The rotary unit 300 can be rotated in one direction by being engaged with the rotary unit 300 so that the string can be wound around the outer circumferential surface of the rotary unit 300. When the cover unit 400 is separated from the rotary unit 300 when the corresponding locking unit 410 is positioned in the second space between the upper and lower engaging units 221 and 222, Can be rotated in the other direction opposite to the one direction, that is, in the unwinding direction, regardless of the movement of the cover unit 400, so that the string wound on the outer circumferential surface of the rotation unit 300 can be wound. That is, the string can be easily wound and unwound according to the relative position between the corresponding latching portion 410 of the cover unit 400 and the upper latching portion 221 and the lower latching portion 222 of the middle unit 200 .

In order to allow the user to select the winding and unwinding of the string, the user must press the corresponding engagement portion 410 of the cover unit 400 and the upper engagement portion 221 and the lower engagement portion 222 of the middle unit 200 You need to control your position. In other words, the user can easily recognize that the second engaging portion 410 of the cover unit 400 is positioned in the first space below the lower engaging portion 222, and the second space between the upper engaging portion 221 and the lower engaging portion 222, Or in a state in which the corresponding latching part 410 is located in the second space between the upper latching part 221 and the lower latching part 222 so as to be located in the first space below the lower latching part 222 There is a need. An impact may be applied to the upper latching portion 221 and / or the lower latching portion 222 of the middle unit 200 and thus the upper latching portion 221 of the middle unit 200 And / or the lower latching part 222 may be damaged.

However, in the case of the string winding and unwinding apparatus according to the present embodiment, when the upper latching portion 221 and / or the lower latching portion 222 of the middle unit 200 are damaged, the base unit 100, the rotation unit 300, And the cover unit 400 are left unchanged, only the middle unit 200 can be replaced, so that maintenance can be performed easily and quickly. In addition, in the case of the winding and unwinding apparatus according to the present embodiment, maintenance can be performed by simply replacing a screw-fitted part or inserting a unit to be replaced without requiring special expertise or a specific tool for maintenance. , It has the merit that users can easily maintain and use them directly.

If the middle unit 200 is integral with the base unit 100, all such components need to be replaced when the upper latching part 221 and / or the lower latching part 222 are damaged, It is difficult to perform maintenance such as separation of all the components connected to the string of shoes or the like and the rotary unit 300 from a string such as shoes or the like. Therefore, it is very difficult to maintain and it takes a long time There will be no.

On the other hand, in the case of the winding and unwinding apparatus according to the present embodiment, a slippery coating is formed on the surfaces of the upper latching portion 221 and / or the lower latching portion 222 and / or the corresponding latching portion 410, It is possible to reduce the possibility of breakage due to frictional force during use.

Of course, in the control process as described above, an impact may be applied to the corresponding latching portion 410 of the cover unit 400, not the upper latching portion 221 and / or the lower latching portion 222 of the middle unit 200 So that the corresponding latching portion 410 of the cover unit 400 may be damaged according to repeated use.

However, in the case of the string winding and unwinding apparatus according to the present embodiment, when the corresponding engagement portion 410 of the cover unit 400 is damaged, the base unit 100, the middle unit 200 and the rotation unit 300 are left Only the lid cover unit 400 needs to be replaced, so that maintenance can be performed easily and quickly. If the cover unit 400 is integral with the rotary unit 300, all such components must be replaced when the corresponding locking part 410 is damaged. In this case, Such as separating the base unit 100 and the like, from a string such as shoes or the like, is very difficult to maintain, and it will take a long time even if the maintenance is progressed.

Figure 8 is a cross-sectional view of a portion of the string winding and unwinding device of Figure 1; In the case of FIG. 2, which is a cross-sectional view of the string winding and unwinding apparatus of FIG. 1, the corresponding latching portion 410 is located in the first space below the lower latching portion 222, And shows a state in which the string can be wound by rotation of the cover unit 400 and the rotation unit 300 in one direction. 8, the corresponding catching part 410 is located in the second space between the upper catching part 221 and the lower catching part 222 and the cover unit 400 is separated from the rotary unit 300, The string can be pulled out as the rotary unit 300 rotates in the other direction opposite to the one direction regardless of the cover unit 400. [

The distance d1 between the first portion of the upper latching portion 221 adjacent to the upper housing 210 and the base plate 110 is smaller than the distance d1 between the upper portion of the upper housing 210 of the upper latching portion 221, The distance d2 between the second portion (the end portion in the direction of the central axis 430) remote from the base plate 110 and the base plate 110 can be made shorter.

When the user presses the corresponding engagement portion 410 of the cover unit 400 and the upper engagement portion 221 and the lower engagement portion 222 of the middle unit 200 in order to select the winding and unwinding of the string, It is necessary to control the relative position with respect to the vehicle. When the user controls to position the corresponding latching portion 410 in the first space below the lower latching portion 222 in a state where the corresponding latching portion 410 is located in the second space between the upper latching portion 221 and the lower latching portion 222, The cover unit 400 may be pressed in the direction of the base unit 100. The cover unit 400 is positioned in the second space between the upper engaging part 221 and the lower engaging part 222 in a state where the corresponding engaging part 410 of the cover unit 400 is positioned in the first space below the lower engaging part 222 When the user controls, the user pulls the cover unit 400 in the direction away from the base unit 100 (+ z direction). In order to prevent the cover unit 400 from being separated from the middle unit 200 in this process, a first portion adjacent to the upper housing 210 of the upper latching portion 221, as shown in FIG. 8, The distance d2 between the base plate 110 and the second portion (the end portion in the direction of the central axis 430) remote from the upper housing 210 of the upper engaging portion 221 is smaller than the distance d1 between the base plate 110 Can be made shorter. The upper latching portion 221 may be formed to have a sagging shape in the direction of the base plate 110 so that the upper latching portion 221 is closer to the base plate 110 as the upper latching portion 221 moves away from the inner circumferential surface 210a of the upper housing 210 . However, the present invention is not limited thereto, and the upper latching portion 221 may have a shape that is not sagged in the direction of the base plate 110.

When the user controls the first and second fastening portions 221 and 222 to be located in the first space below the lower fastening portion 222 in a state where the corresponding fastening portion 410 is located in the second space between the upper fastening portion 221 and the lower fastening portion 222, , The user may press the cover unit 400 in the direction of the base unit 100. It may be necessary to prevent the cover unit 400 from excessively moving toward the base unit 100 as necessary. This can be realized by using the partition 240 of the middle unit 200.

The partition 240 may have a shape protruding inward from the upper housing 210 (in the direction of the central axis 430) and positioned closer to the base plate 110 than the lower engaging portion 222 . The excessive movement of the corresponding latching portion 410 in the direction of the base unit 100 when the corresponding latching portion 410 of the cover unit 400 is located in the space under the lower latching portion 222 Can be effectively prevented.

The cover unit 400 is engaged with the rotation unit 300 when the corresponding locking unit 410 is positioned in the first space below the lower locking unit 222. In this case, (300) can rotate only in one predetermined direction by the action of the ratchet projection (460) and the corresponding projection (250). This is because, if the rotation unit 300 is rotated in the other direction regardless of the user's intention, the string wound on the rotation unit 300 may be unwound regardless of the user's intention.

As described above, the corresponding protrusion 250 may be positioned on the surface of the partition 240 in the direction of the lower engaging portion 222 (+ z direction). At this time, when the cover unit 400 has a ratchet projection 460 (see FIG. 7) and the corresponding latching portion 410 is located in the first space below the lower latching portion 222, 250 can be engaged with the ratchet projection 460. When the corresponding projection 250 is engaged with the ratchet projection 460, the cover unit 400 can rotate only in a predetermined direction with respect to the middle unit 200, The rotating unit 300 can also be rotated in only one predetermined direction.

In the case of the ratchet projection 460 having the shape as shown in Fig. 7 and the corresponding projection 250 having the shape as shown in Fig. 4, the corresponding latching portion 410 is formed in the first space When the user looks at the cover unit 400 in the -z direction, the cover unit 400 can be rotated in the clockwise direction (i.e., the winding direction). 8, when the corresponding latching portion 410 is located in the second space between the upper latching portion 221 and the lower latching portion 222, the corresponding projection 250 is engaged with the ratchet projection 460, As shown in Fig.

9 is a cross-sectional view of a part of a string winding and unwinding apparatus according to another embodiment of the present invention. As shown in FIG. 9, in the case of the string winding and unwinding apparatus according to the present embodiment, the middle unit 200 may have the latching portion 230.

The hooking support portion 230 extends inward from the upper housing 210 (in the direction of the central axis 430) so that a space exists between the hooking support portion 230 and the inner circumferential surface 210a of the upper housing 210 It can have a bent shape. More specifically, the latching support portion 230 includes a first portion 231 extending inwardly from the upper housing 210, a second portion 233 extending in the direction (-z direction) intersecting the first portion 231, And a bent portion 232 between the first portion 231 and the second portion 233. A space may be present between the second portion 233 of the latching support portion 230 and the inner circumferential surface 210a of the upper housing 210. [ Of course, the latching support part 230 may be integral with the upper housing 210 as shown in FIG. The upper latching part 221 and the lower latching part 222 may be located on a surface of the latching part 230 in a direction away from the upper housing 210 (in the direction of the central axis 430). The upper latching part 221 and the lower latching part 222 may be integrally formed with the latching part 230.

When the user presses the cover unit 400 toward the base unit 100 or pulls the cover unit 400 away from the base unit 100, the corresponding catching part 410 is positioned between the upper catching part 221 and the lower catching part 222 The first space is moved to the first space below the lower latching part 222 and the second space is moved in the reverse direction. A space is provided between the latching support portion 230 and the inner circumferential surface 210a of the upper housing 210 so that when the latching portion 410 moves, the latching support portion 230 is inserted into the inner circumferential surface 210a of the upper housing 210, When the movement of the corresponding latching part 410 is completed, it can be returned to the original position. It is possible to effectively prevent the corresponding latching portion 410, the upper latching portion 221 and / or the lower latching portion 222 from being damaged by the movement of the corresponding latching portion 410, 400) can be further enhanced.

9, in addition to the upper latching portion 221 and the lower latching portion 222, the latching support portion 230 is provided with an additional latching portion 221, which is located closer to the base plate 110 than the lower latching portion 222, (223) can be positioned on the latching support portion (230). The additional engaging portion 223 is provided on the surface of the engaging support portion 230 in a direction away from the upper housing 210 (in the direction of the central axis 430), like the upper engaging portion 221 and the lower engaging portion 222 Can be located. The additional latching part 223 may function to define a first space below the lower latching part 222 together with the lower latching part 222. [ The additional engaging portion 223 restricts the movement of the engaging portion 410 in the direction of the base plate 110 to prevent the cover unit 400 from moving excessively in the direction of the base unit 100 can do. Of course, without the additional latching portion 223, the space between the lower latching portion 222 and the partition 240 may serve to define the first space. This also applies to the above-described embodiments and / or modifications described later.

10 is a cross-sectional view of a portion of a string winding and unwinding apparatus according to another embodiment of the present invention. In the case of the string winding and unwinding apparatus according to the present embodiment, the latch support portion 230 has a shape extending inward from the upper housing 210 (in the direction of the central axis 430). The hooking support portion 230 has a shape bent in a plurality of turns while extending inward from the upper housing 210 such that a space exists between the hooking support portion 230 and the inner circumferential surface 210a of the upper housing 210. [ Specifically, the latching support 230 is bent a plurality of times so that there are at least two convex portions in the direction away from the upper housing 210 (in the direction of the central axis 430). It can be understood that the upper latching part 221 and the lower latching part 222 are convex parts of the latching part 230. Of course, the latching support portion 230 may be integral with the upper housing 210 as shown in FIG.

When the user presses the cover unit 400 toward the base unit 100 or pulls the cover unit 400 away from the base unit 100, the corresponding catching part 410 is positioned between the upper catching part 221 and the lower catching part 222 The first space is moved to the first space below the lower latching part 222 and the second space is moved in the reverse direction. A space is provided between the latching support portion 230 and the inner circumferential surface 210a of the upper housing 210 so that when the latching portion 410 moves, the latching support portion 230 is inserted into the inner circumferential surface 210a of the upper housing 210, When the movement of the corresponding latching part 410 is completed, it is possible to return to the original position. It is possible to effectively prevent the corresponding latching portion 410, the upper latching portion 221 and / or the lower latching portion 222 from being damaged by the movement of the corresponding latching portion 410, 400) can be further enhanced.

10, the distal end of the hook 230 in the direction of the base plate 110 moves away from the inner circumferential surface 210a of the upper housing 210 (in the direction of the central axis 430) And the like. This end can be understood as an additional catch 223 as described above with reference to Fig. That is, the distal end portion may serve as the additional catching portion 223 to define the first space below the lower catching portion 222 together with the lower catching portion 222. [ The additional engaging portion 223 restricts the movement of the engaging portion 410 in the direction of the base plate 110 to prevent the cover unit 400 from moving excessively in the direction of the base unit 100 can do.

In FIG. 10, the latching support portions 230 having a bent shape a plurality of times are extended in the inward direction from the upper housing 210 and are integral with the upper housing 210, but the present invention is limited to this no. For example, as shown in FIG. 11, which is a cross-sectional view of a portion of a string winding and unwinding apparatus according to another embodiment of the present invention, the middle unit 200 of the string winding and unwinding apparatus according to the present embodiment includes a flexure 230 '). The flexure 230 'may be attached to a through hole or a groove through the upper housing 210. 11 shows that the flexure 230 'is fixed to the upper housing 210 by inserting a part of the flexure 230' into the through hole passing through the upper housing 210. [ Most of the flexure 230 'is located inside the upper housing 210. That is, when the flexure 230 'is fixed to the upper housing 210, most of the flexure 230' is fixed to the upper housing 210 except for the portion used to fix the flexure 230 ' Respectively.

This flexure 230 'may have a shape similar to the retaining portion 230 of the multiple-folded shape described above with reference to FIG. That is, the flexure 230 'has a bent shape so that there is a space between the flexure 230' and the inner circumferential surface 210a of the upper housing 210. Specifically, the flexure 230 'is bent a plurality of times so that there are at least two convex portions in the direction away from the upper housing 210 (in the direction of the central axis 430). It can be understood that the upper latching portion 221 and the lower latching portion 222 are convex portions of the flexure 230 '. The flexure 230 'may be formed using a resin or a metal plate, and may preferably have elasticity.

When the user presses the cover unit 400 toward the base unit 100 or pulls the cover unit 400 away from the base unit 100, the corresponding catching part 410 is positioned between the upper catching part 221 and the lower catching part 222 The first space is moved to the first space below the lower latching part 222 and the second space is moved in the reverse direction. A space is provided between the flexure 230 'and the inner circumferential surface 210a of the upper housing 210 so that the flexure 230' moves to the upper housing 210 when the corresponding locking portion 410 moves. It is possible to return to the original position when the movement of the corresponding latching part 410 is completed. It is possible to effectively prevent the corresponding latching portion 410, the upper latching portion 221 and / or the lower latching portion 222 from being damaged by the movement of the corresponding latching portion 410, 400) can be further enhanced. In addition, when the flexure 230 'is damaged due to repeated use by the user, only the flexure 230' needs to be replaced, so that the ease of maintenance of the string winding and unwinding device can be remarkably increased.

11, the flexure 230 ', which is bent in a plurality of times, has a shape in which the distal end of the flexure 230' in the direction of the base plate 110 is away from the inner circumferential surface 210a of the upper housing 210 Direction) in the direction perpendicular to the plane of the substrate. This end can be understood as an additional catch 223 as described above with reference to Fig. That is, the distal end portion may serve as the additional catching portion 223 to define the first space below the lower catching portion 222 together with the lower catching portion 222. [ The additional engaging portion 223 restricts the movement of the engaging portion 410 in the direction of the base plate 110 to prevent the cover unit 400 from moving excessively in the direction of the base unit 100 can do.

12 is a cross-sectional view of a portion of a string winding and unwinding apparatus according to another embodiment of the present invention. As shown in FIG. 12, in the string winding and unwinding apparatus according to the present embodiment, the upper latching portion 221 and the lower latching portion 222 can have a concave shape. That is, the upper latching portion 221 and the lower latching portion 222 can be understood as concave portions formed in the inner circumferential surface 210a of the upper housing 210. The cover unit 400 is engaged with the rotation unit 300 and at least a part of the corresponding engaging portion 410 is engaged with the engaging portion 410. In this case, when the engaging portion 410 is at least partially positioned in the lower engaging portion 222, The cover unit 400 may be spaced apart from the rotation unit 300 when the cover unit 400 is positioned within the cover unit 221.

On the other hand, in the string winding and unwinding apparatus as described above, when the corresponding latching portion 410 is moved to be positioned in the lower latching portion 222 in the state where it is located in the upper latching portion 221 or vice versa, It is necessary to do. For this, at least a part of the corresponding latching portion 410 can be made flexible. Concretely, the distal end portion (in the direction of the upper housing 210) of the corresponding latching portion 410 can be made flexible. For example, the distal end portion of the corresponding latching portion 410 can be made flexible by including rubber or leaf spring. Of course, the fact that at least a part of the corresponding latching portion 410 is flexible can be applied to the above-described embodiments, or embodiments described later or modifications thereof, with reference to other drawings in addition to the present embodiment.

13, which is a cross-sectional view of one part of the string winding and unwinding apparatus according to another embodiment of the present invention, a groove 430a is formed on the outer surface of the central axis 430 of the cover unit 400 And the corresponding latching portion 410 may be engaged with the groove 430a. In this case as well, at least a part of the engaging portion 410 can be made flexible. Concretely, the distal end portion (in the direction of the upper housing 210) of the corresponding latching portion 410 can be made flexible. For example, the corresponding latching portion 410 itself or the end portion of the corresponding latching portion 410 may be made flexible by including rubber or leaf spring. The reason why the groove 430a is formed on the outer surface of the central axis 430 of the cover unit 400 and the corresponding engaging portion 410 is fitted into the groove 430a is not limited to the above- The present invention can be applied to the above-described embodiments or embodiments described later or modifications thereof. For reference, forming the groove 430a on the outer surface of the center shaft 430 means that a through hole is formed through the center shaft 430. [ Since a part of the through hole can be interpreted as a groove on the outer surface of the central shaft 430.

As described above, when the cover unit 400 is engaged with the rotation unit 300, the ratchet projection 460 and the corresponding protrusion 250 are engaged with each other. When the cover unit 400 is separated from the rotation unit 300, The projection 460 and the corresponding projection 250 are spaced from each other. In FIGS. 1 to 13 referred to in describing the above embodiments, the ratchet projection 460 is positioned on the lower surface of the cover unit 400 in the direction of the base plate 110 (-z direction) 250 are formed on the middle unit 200 and the corresponding protrusions 250 protrude toward the cover unit 400. 1 to 13, the ratchet protrusions 460 are disposed on the lower surface of the center shaft 430 in the direction of the base plate 110 (-z direction) or in the direction of the base plate 110 (- z direction) and the corresponding projection 250 is positioned on the upper surface of the partition 240 in the direction of the cover unit 400 (+ z direction). However, the present invention is not limited thereto.

14, which is a perspective view schematically showing the middle unit 200 of the string winding and unwinding apparatus according to another embodiment of the present invention, the corresponding protrusion 250 is formed in the upper housing 210 of the partition wall 240, May be located on the inner surface in the center direction of the substrate 210. 15, which is a cross-sectional view of a portion of the cover unit 400 that can be used with the middle unit 200 of FIG. 14 in this case, the ratchet projection 460 also includes a central axis 430 of the cover unit 400 The ratchet projection 460 is engaged with the corresponding projection 250 according to the distance between the cover unit 400 and the base plate 110 or the ratchet projection 460 is engaged with the corresponding projection 250, (Not shown). 15, the central axis 430 of the cover unit 400 may have a shape extending further downward (-z direction) than the position of the corresponding latching portion 410. [

16 is a perspective view schematically showing a shoe according to another embodiment of the present invention. As shown in Fig. 16, the shoe according to the present embodiment has the string winding and drawing apparatus 1 according to any one of the above-described embodiments or its modifications. For example, the string winding and unwinding device 1 may be attached on the sulphone T of the shoe so that the string S is connected to the string winding and unwinding device 1. Of course, the string winding and drawing device 1 may be attached to other parts such as the side or back side shoe part of the shoe. That is, the string S of the shoe passes through any one of the second side through holes 122 of the base unit 100, passes through the second through hole 332 of the rotation unit 300, And can pass through the other of the two side through holes 122. Accordingly, when the rotary unit 300 is engaged with the cover unit 400 and rotated in one direction, the string S is wound on the rotary unit 300. As the string S is wound in this way, the shoe can be brought into close contact with the user's foot. Of course, in such a state, when the rotary unit 300 is separated from the cover unit 400, the rotary unit 300 can be rotated in the other direction opposite to the one direction, So that the wound string S can be unwound from the outer circumferential surface of the rotary unit 300.

Although the shoes are shown in Fig. 16, the string winding and unwinding device according to the above-described embodiments and modifications thereof is mounted on various articles requiring locking by a string such as a hat, a waistband, a watch, And various articles equipped with the string winding and unwinding apparatus according to the above-described embodiments and modifications thereof are also within the scope of the present invention.

17 is a perspective view schematically showing a string winding and winding device according to another embodiment of the present invention. Referring to FIG. 17, the base unit 100 of the string winding and unwinding apparatus according to the present embodiment further includes a clip portion 140. The clip portion 140 has a shape corresponding to the base plate 110 and extending from the base plate 110 such that a space exists between the clip portion 140 and the base plate 110. 17, the clip unit 140 may have a bent shape extending from the base plate 110 and having a portion substantially in parallel with the base plate 110. As shown in FIG. The clip portion 140 may be integral with the base plate 110 or may be a separate component or fixed to the base plate 110. The clip portion 140 may have a flexible characteristic including, for example, a resin, a metal plate, and the like.

In the string winding and unwinding apparatus according to this embodiment, the string winding and unwinding apparatus can be easily attached to and detached from the article to be used by using the space between the base plate 110 and the clip section 140 . 16, the space between the base plate 110 and the clip portion 140 is formed in the heel tab HT or the throat T, which is a portion adjacent to the ankle when worn in the rear portion of the shoe, The string winding and unwinding device can be easily attached to and detached from the shoe.

18 is a perspective view schematically showing a string winding and unwinding apparatus according to another embodiment of the present invention. 17, the base unit 100 may further include a rail 144 positioned on the lower surface of the base plate 110 (-z direction) and extending in one direction (y-axis direction) . Of course, in order to allow a space to exist between the rail 144 and the base plate 110, it is necessary to connect the base plate 110 and the rail 144 so that the width of the rail 144 The connection portion 142 may be provided.

The string winding and unwinding apparatus according to this embodiment can be used together with the fastening clip 500 as shown in Fig. 19, the fastening clip 500 is folded twice so that the first part 510 and the second part 510, which are adjacent to each other, And a third portion 530 located adjacent to the second portion 520 and opposite the first portion 510 is substantially parallel to the second portion 520 And there is a space between the first portion 520 and the second portion 520. At this time, the third part 530 has a first guide rail 531 and a second guide rail 532 which are positioned in the same plane and spaced apart from each other.

This fastening clip 500 allows the string winding and winding device according to the present embodiment to be easily attached to and detached from various articles. 16, a space between the first portion 510 and the second portion 520 of the fastening clip 500 as shown in Fig. 19 is provided on the ankle when worn on the back of the shoe, for example, The third portion 530 may be mounted on the shoe so that the third portion 530 is located outside the shoe by being fitted to the heel tap HT or the droplet T which is an adjacent portion. The rail 144 of the string winding and unwinding apparatus according to this embodiment as shown in Fig. 18 is attached to the first guide rail 531 and the second guide rail 532 of the fastening clip 500, So that it can be easily mounted on the fastening clip 500.

On the other hand, like the rail 144, the connecting portion 142 can have a shape extending in one direction (y-axis direction). The shape of the connection portion 142 corresponds to the shape of the space between the first guide rail 531 and the second guide rail 532 of the fastening clip 500. The shape In the process of using the string winding and unwinding device, the relative position of the string winding and unwinding device with respect to the locking clip 500 can be fixed without changing. Of course, the shape of the connection portion 142 is not limited to this, and may be varied in various ways.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1: string winding and unwinding device 100: base unit
110: base plate 111: through hole
120: lower housing 121: first side through hole
122: second side through hole 130:
132: rotation supporting projection 200: middle unit
210: upper housing 210a: inner peripheral surface
221: upper fastening part 222: lower fastening part
223: additional engaging portion 230: engaging support portion
230: flexure 231: first part
232: a bent portion 233: a second portion
240: partition wall 250: corresponding projection
300: rotating unit 310: first engaging portion
321: first wing portion 322: second wing portion
323: third wing portion 331: first through hole
332: second through hole 400: cover unit
410: corresponding latching portion 420: cover plate
430: center shaft 430a: groove
440: side plate 450: second engaging portion
460: ratchet projection

Claims (18)

A base unit having a base plate and a cylindrical lower housing located on the upper surface of the base plate and having side through holes;
A lower housing having a cylindrical upper housing coupled to the lower housing, an upper housing located on the inner side of the upper housing, and a lower housing located on the inner side of the upper housing and positioned closer to the base plate than the upper housing , A middle unit;
At least a part of which is rotatable with respect to the base unit, is located inside the lower housing, and the string can be wound around the outer circumferential surface or can be unwound from the outer circumferential surface by rotation; And
And a second engaging portion which is engaged with the middle unit so as to be rotatable relative to the middle unit and has a corresponding engaging portion protruding in a radial direction, A cover unit having a variable distance from the rotation unit and capable of being engaged with or spaced from the rotation unit, rotatable together with the rotation unit when engaged with the rotation unit, and having a ratchet projection in one direction;
And,
Wherein the middle unit has a partition wall protruding inwardly and located closer to the base plate than the lower engaging portion and a corresponding projection located on the partition wall and engageable with the ratchet projection. The method according to claim 1,
And the upper latching portion and the lower latching portion are located in the upper housing. A base unit having a base plate and a cylindrical lower housing located on the upper surface of the base plate and having side through holes;
A lower locking part located on the inner side of the upper housing and located closer to the base plate than the upper locking part; and a lower locking part positioned on the inner side of the upper housing and positioned closer to the base plate than the upper locking part, The upper housing has a hooked support portion extending inwardly from the upper housing such that a space exists between the hooked portion and the inner circumferential surface of the upper housing, A middle unit,
At least a part of which is rotatable with respect to the base unit, is located inside the lower housing, and the string can be wound around the outer circumferential surface or can be unwound from the outer circumferential surface by rotation; And
And a second engaging portion which is engaged with the middle unit so as to be rotatable relative to the middle unit and has a corresponding engaging portion protruding in a radial direction, The cover unit being capable of being engaged with the rotation unit or being spaced apart from the rotation unit, and capable of rotating together with the rotation unit when the rotation unit is engaged with the rotation unit;
And the string winding and winding device. A base unit having a base plate and a cylindrical lower housing located on the upper surface of the base plate and having side through holes;
A lower locking part located on the inner side of the upper housing and located closer to the base plate than the upper locking part; and a lower locking part positioned on the inner side of the upper housing and positioned closer to the base plate than the upper locking part, And a hook support portion extending inwardly from the upper housing so as to have a space therebetween so that there is a space between the upper housing and the inner circumferential surface of the upper housing, wherein the hook support portion has at least two convex portions in a direction away from the upper housing Wherein the upper and lower engaging portions are convex portions of the engaging supporting portion;
At least a part of which is rotatable with respect to the base unit, is located inside the lower housing, and the string can be wound around the outer circumferential surface or can be unwound from the outer circumferential surface by rotation; And
And a second engaging portion which is engaged with the middle unit so as to be rotatable relative to the middle unit and has a corresponding engaging portion protruding in a radial direction, The cover unit being capable of being engaged with the rotation unit or being spaced apart from the rotation unit, and capable of rotating together with the rotation unit when the rotation unit is engaged with the rotation unit;
And the string winding and winding device. A base unit having a base plate and a cylindrical lower housing located on the upper surface of the base plate and having side through holes;
A lower locking part located on the inner side of the upper housing and located closer to the base plate than the upper locking part; and a lower locking part positioned on the inner side of the upper housing and positioned closer to the base plate than the upper locking part, And a flexure that is coupled to the upper housing and is bent a plurality of times so that a space is present between the upper housing and the inner circumferential surface of the upper housing and the flexure is convex in a direction away from the upper housing, Wherein the upper latching portion and the lower latching portion are convex portions of the flexure;
At least a part of which is rotatable with respect to the base unit, is located inside the lower housing, and the string can be wound around the outer circumferential surface or can be unwound from the outer circumferential surface by rotation; And
And a second engaging portion which is engaged with the middle unit so as to be rotatable relative to the middle unit and has a corresponding engaging portion protruding in a radial direction, The cover unit being capable of being engaged with the rotation unit or being spaced apart from the rotation unit, and capable of rotating together with the rotation unit when the rotation unit is engaged with the rotation unit;
And the string winding and winding device. 6. The method according to any one of claims 1 to 5,
Wherein the upper latching portion and the lower latching portion have a convex shape in a direction away from the inner circumferential surface of the upper housing,
The distance of the cover unit from the base unit can be varied as the corresponding latching part is located in the first space below the lower latching part or in the second space between the upper latching part and the lower latching part, Wherein when the corresponding engaging portion is located in the first space, the engaging portion is rotatable together with the rotating unit by engaging with the rotating unit, and when the engaging portion is located in the second space, Withdrawal device. A base unit having a base plate and a cylindrical lower housing located on the upper surface of the base plate and having side through holes;
An upper housing having a cylindrical shape and coupled to the lower housing, an upper housing having a convex shape located inside the upper housing and convex in a direction away from the inner circumferential surface of the upper housing, A middle unit located close to the base plate and having a lower engaging portion convex in a direction away from the inner circumferential surface of the upper housing;
At least a part of which is rotatable with respect to the base unit, is located inside the lower housing, and the string can be wound around the outer circumferential surface or can be unwound from the outer circumferential surface by rotation; And
And a second engaging portion which is engaged with the middle unit so as to be rotatable relative to the middle unit and has a corresponding engaging portion protruding in a radial direction, The cover unit being capable of being engaged with the rotation unit or being spaced apart from the rotation unit, and capable of rotating together with the rotation unit when the rotation unit is engaged with the rotation unit;
And,
The distance of the cover unit from the base unit can be varied as the corresponding latching part is located in the first space below the lower latching part or in the second space between the upper latching part and the lower latching part, And when the corresponding latching portion is located in the first space, it can rotate together with the rotating unit by being engaged with the rotating unit, and when the corresponding latching portion is located in the second space, Wherein a distance between the base plate and a second portion of the upper engagement portion, which is farther from the upper housing than a distance between the first portion adjacent the upper housing and the base plate, is shorter. 4. The method according to any one of claims 1 to 3,
And the upper latching portion and the lower latching portion have concave shapes. 6. The method according to any one of claims 1 to 5,
At least a portion of the corresponding latching portion being flexible. 6. The method according to any one of claims 1 to 5,
Wherein the cover unit has a central shaft having an outer surface formed with a groove, and the corresponding engaging portion is engaged with the groove of the central shaft. 6. The method according to any one of claims 2 to 5,
Wherein the cover unit has a unidirectional ratchet projection, and the middle unit has a corresponding projection that can be engaged with the ratchet projection therein. 12. The method of claim 11,
Wherein the one-way ratchet projection and the corresponding projection are engaged with each other when the cover unit is engaged with the rotation unit, and the one-way ratchet projection and the corresponding projection are spaced apart from each other when the cover unit is separated from the rotation unit. . The method according to claim 1,
And the corresponding projection is located on a face of the partition wall in the direction of the lower engaging portion. The method according to claim 1,
And the corresponding projection is located on the inner surface in the center direction of the upper housing of the partition. 6. The method according to any one of claims 1 to 5,
Wherein the base unit further comprises a clip portion corresponding to the base plate and extending from the base plate such that a space exists between the base plate and the base plate. 6. The method according to any one of claims 1 to 5,
Wherein the base unit further comprises a rail located on a lower surface of the base plate and extending in one direction. A base unit having a base plate and a cylindrical lower housing located on the upper surface of the base plate and having side through holes;
A lower housing having a cylindrical upper housing coupled to the lower housing, an upper housing located inside the upper housing, and a lower housing located on the inner side of the upper housing and positioned closer to the base plate than the upper housing, A middle unit detachably coupled to the base unit;
At least a part of which is rotatable with respect to the base unit, is located inside the lower housing, and the string can be wound around the outer circumferential surface or can be unwound from the outer circumferential surface by rotation; And
And a second engaging portion which is engaged with the middle unit so as to be rotatable relative to the middle unit and has a corresponding engaging portion protruding in a radial direction, The cover unit being capable of being engaged with the rotation unit or being spaced apart from the rotation unit, and capable of rotating together with the rotation unit when the rotation unit is engaged with the rotation unit;
And the string winding and winding device. 18. The method of claim 17,
Wherein a thread is formed on at least a part of the outer surface of the lower housing and a threaded portion corresponding to the thread is formed on at least a part of the inner surface of the middle unit so that the base unit and the middle unit are threadedly engaged, .

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