Shoelace tightening device

Abstract

This invention relates to a shoelace tightening device in which the assembly components are simplified, and the cap and rotating tension part operate together when winding or unwinding the shoelace through a simple assembly via a hook connection. [Solution] The present invention relates to a shoelace tightening device, and more specifically, the fixed housing and the cap, which serves as a handle, are snap-fitted together, thereby preventing the cap, which is fixedly supported by the rotating tension part when the shoelace is unwound, from detaching from the fixed housing, and also providing a rotating tension part with a simple structure instead of the conventional cylindrical rotating housing.

Description

Technical Field

[0001] The present invention relates to a shoelace tightening device. More specifically, when the shoelace is unwound, the cap fixedly supported on the rotary tension part is prevented from detaching from the fixed housing by snap-fitting the fixed housing and the cap as a handle to each other. In addition, by providing a rotary tension part with a simple structure instead of the conventional cylindrical rotary housing, the assembly components are simplified, and the cap and the rotary tension part can operate together when the shoelace is wound or unwound through simple assembly by hook coupling. The present invention relates to a shoelace tightening device.

Background Art

[0002] Shoes such as sports shoes are provided with shoelaces to make the shoes fit well on each individual's feet. After putting on the shoes, the wearer pulls and tightens the shoelaces appropriately so that their feet and the shoes are in close contact to enable safe and comfortable walking.

[0003] On the other hand, it is very cumbersome to untie and retie the shoelaces every time the shoes are put on or taken off. To solve such cumbersome problems, a number of shoelace tightening devices have been developed and proposed.

[0004] For example, Republic of Korea Patent No. 959800 (published May 28, 2010) describes a fixed housing, a rotating housing rotatably coupled to the fixed housing, a winding drum provided within the fixed and rotating housings for winding or unwinding shoelaces, a first sawtooth profile and a second sawtooth profile provided on one side of either the fixed or rotating housing, provided along the direction in which the fixed and rotating housings are coupled to each other, and provided on the other housing of the fixed and rotating housings that does not have the first sawtooth profile and the second sawtooth profile. A shoelace tightening device is disclosed, characterized by including a latch that engages with a first sawtooth profile or a second sawtooth profile and interacts with each other so that the shoelace can be wound onto or unwound on a winding drum, at least one guide projection provided so as to project upward from the top of the winding drum, a projection guide formed in a rotating housing which houses and guides the guide projection, a free-curve spring coupled to the top of the rotating housing, and a coupling member that fixes and connects the rotating housing so that the latch selectively engages with either the first sawtooth profile or the second sawtooth profile.

[0005] Korean Patent No. 1147681 (published May 22, 2012) includes a fixed housing, a rotating housing rotatably coupled to the fixed housing, a winding drum inserted inside the fixed housing and the rotating housing, a coupling unit connecting the fixed housing and the rotating housing, and a free-curving spring coupled to the top of the rotating housing, wherein one side of either the fixed housing or the rotating housing has a first sawtooth profile and a second sawtooth profile formed thereon, and the other housing, which does not have the first and second sawtooth profiles formed thereon, is provided with a latch that selectively engages with the second sawtooth profile or the first sawtooth profile and interacts with it, and the lower region of the rotating housing and the top of the winding drum A shoelace tightening device is disclosed characterized in that a portion of the region is provided with housing coupling saw teeth and drum coupling saw teeth that interlock with each other and act in a circular manner. Korean Patent No. 1107372 (published January 19, 2012) discloses a shoelace tightening device that includes a fixed housing in which a drum rotation axis is formed in a central region, a rotating housing coupled to the fixed housing so as to be rotatable relative to the fixed housing, a winding drum inserted inside the fixed housing and the rotating housing and provided with a winding section for winding or unwinding shoelaces, and a coupling unit guide shaft that connects the fixed housing and the rotating housing and guides the up / down movement of the rotating housing for winding or unwinding shoelaces.

[0006] However, the conventional shoelace tightening device requires connecting members to link the various components in addition to the fixed housing, cylindrical rotating housing, and winding drum, and must also incorporate specially shaped springs to provide elastic force for operation. As a result, the manufacturing cost increases due to the increase in components, and the structure becomes more complex. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Registered Patent No. 10-959800, Republic of Korea [Patent Document 2] Registered Patent No. 10-1147681, Republic of Korea [Patent Document 3] Registered Patent Number 10-1107372, Republic of Korea [Overview of the project] [Problems that the invention aims to solve]

[0008] The present invention was devised to solve the aforementioned problems, and the object of the present invention is to provide a shoelace tightening device in which the cap, which is fixedly supported on the rotating tension part when the shoelace is unwound, is prevented from detaching from the fixed housing by snap-fitting the fixed housing and the cap, which serves as a handle, to each other.

[0009] Another object of the present invention is to provide a shoelace tightening device that is simplified in configuration and structure and easy to manufacture by having a rotating tension part with a simple structure instead of the conventional complex cylindrical rotating housing.

[0010] Another object of the present invention is to provide a shoelace tightening device in which the cap and the rotating tension part can operate together when winding or unwinding the shoelace by simple assembly through a hook connection.

[0011] Another object of the present invention is to provide a shoelace tightening device that can reduce the risk of damage due to allowing only unidirectional rotation by further forming an intermediate sawtooth portion that engages with the tension coupling sawtooth between the stop tooth profile portion of the latch and the latch arm. [Means for solving the problem]

[0012] A shoelace tightening device according to one embodiment of the present invention for achieving the above-mentioned objectives is characterized by comprising: a fixed housing having a cylindrical housing portion with an open top inside, the upper inner circumferential surface of which tension reverse rotation prevention saw teeth are formed; a rotating tension portion having tension coupling saw teeth formed on the lower side so as to be unidirectional with respect to a winding drum, a tension shaft that extends downward from the center and is coupled so as to be vertically movable in the axial direction, and at least one latch portion having tension that engages with the tension reverse rotation prevention saw teeth around the outer periphery of the tension coupling saw teeth; a winding drum that is inserted into the housing portion and has drum coupling saw teeth that engage with the tension coupling saw teeth of the rotating tension portion, a shaft coupling hole formed in the center so as to be vertically movable for the tension shaft, and a winding portion on which shoelaces are wound or unwound; and a cap that is coupled to the upper side of the rotating tension portion and fixedly supported on the rotating tension portion so as to act as a handle, and that snap-fits with the fixed housing to prevent it from detaching from the fixed housing when the shoelaces are unwound.

[0013] Furthermore, a detachment prevention step is formed protruding outward from the upper outer peripheral surface of the fixed housing, and the area around the cap extends downward to form a space below, but a portion of the extended end extends radially inward again for a predetermined length to form a coupling step, and the detachment prevention step and the coupling step are snap-fit ​​connected with a gap that is separated vertically.

[0014] Furthermore, the anti-detachment step is provided with an annular fitting projection formed at its bottom end, and the coupling step is formed of one or more flanges that protrude radially inward, so that the annular fitting projection engages with the flange when the shoelace is unwound.

[0015] Furthermore, a cap locking portion is formed to protrude downward from the inner bottom surface of the cap, and a hook locking groove is formed at the tip of the corresponding latch portion of the rotating tension portion. The cap locking portion is inserted into and fixed in the hook locking groove, so that the cap and the rotating tension portion operate together when the shoelace is wound up or unwound.

[0016] Furthermore, the latch portion is characterized by comprising: a strip-shaped latch arm extending in an arc shape; a stop tooth profile formed at the end of the latch arm with a sawtooth shape corresponding to the shape of the tension reverse rotation prevention sawtooth of the fixed housing; and an intermediate sawtooth portion formed between the stop tooth profile and the latch arm, which engages with the tension coupling sawtooth.

[0017] Furthermore, a hook coupling projection is formed on the lower part of the fixed housing, a hook locking step is formed on the upper end of the base, and the fixed housing and the base are assembled and fastened to each other through the hook coupling. [Effects of the Invention]

[0018] According to the shoelace tightening device of the present invention configured as described above, the fixed housing and the cap, which serves as a handle, are snap-fit ​​connected to each other, which has the effect of preventing the cap, which is fixedly supported by the rotating tension part when the shoelace is unwound, from detaching from the fixed housing.

[0019] Furthermore, by incorporating a simple rotating tension section instead of the conventional complex cylindrical rotating housing, the configuration and structure are simplified, resulting in easier manufacturing.

[0020] Furthermore, the simple assembly via the hook connection allows the cap and the rotating tension part to operate together when winding or unwinding the shoelace, which is a significant advantage.

[0021] In addition, by further forming an intermediate serrated portion that meshes with the tension coupling serrations between the retaining tooth portion of the latch portion and the latch arm, there is also an advantage that can reduce the risk of breakage due to allowing only one-way rotation.

Brief Description of the Drawings

[0022] [Figure 1a] It is an exploded perspective view and a combined cross-sectional view of the shoelace tightening device according to the present invention. [Figure 1b] It is an exploded perspective view and a combined cross-sectional view of the shoelace tightening device according to the present invention. [Figure 2a] It is a combined cross-sectional view showing the snap-fit connection between the cap and the fixed housing of the shoelace tightening device according to the present invention. [Figure 2b] It is a bottom perspective view of the cap that snap-fits with the shoelace tightening device according to the present invention. [Figure 2c] It is a bottom perspective view of the fixed housing that snap-fits with the shoelace tightening device according to the present invention. [Figure 3] It is a plan view of the connection between the cap and the tension shaft of the shoelace tightening device according to the present invention. [Figure 4] It is a plan view showing the connection state between the tension shaft for one-way rotation and the fixed housing of the shoelace tightening device according to the present invention. [Figure 5] It is a combined cross-sectional view showing the connection state between the tension shaft and the winding drum of the shoelace tightening device according to the present invention. [Figure 6a] It is a combined side cross-sectional view showing the operating state of the up-and-down movement structure by snap-fit connection and tension shaft connection of the shoelace tightening device according to the present invention. [Figure 6b] It is a combined side cross-sectional view showing the operating state of the up-and-down movement structure by snap-fit connection and tension shaft connection of the shoelace tightening device according to the present invention.

Embodiments for Carrying Out the Invention

[0023] The present invention may be implemented in various other forms without departing from its technical idea or main features. Therefore, the embodiments of the present invention are merely illustrative in all respects and should not be construed as limiting.

[0024] The terms "first," "second," etc., may be used to describe a variety of components, but the components should not be limited by these terms.

[0025] The aforementioned terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0026] When it is mentioned that one component is "connected" or "linked" to another component, it should be understood that this may mean that the other component is directly connected or linked to it, or that other components may be present in between.

[0027] On the other hand, when it is said that one component is "directly connected" or "directly linked" to another component, it should be understood that there are no other components in between.

[0028] The terminology used in this application is solely for the purpose of describing specific embodiments and is not intended to limit the invention. Unless the context clearly indicates otherwise, singular expressions include plural expressions.

[0029] In this application, terms such as “includes,” “comes with,” or “has” are intended to specify the presence of features, numbers, stages, operations, components, parts, or combinations thereof as described in the specification, and should be understood not to preemptively exclude the possibility of the presence or addition of one or more other features, numbers, stages, operations, components, parts, or combinations thereof.

[0030] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as those generally understood by a person with ordinary skill in the art to which this invention pertains.

[0031] Terms as defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0032] Hereinafter, in order to enable persons with ordinary skill in the art to easily implement the present invention, the most preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0033] Figures 1a and 1b are exploded perspective views and coupled cross-sectional views of the shoelace tightening device according to the present invention; Figure 2a is a coupled cross-sectional view showing the snap-fit ​​coupling of the cap and fixed housing of the shoelace tightening device according to the present invention; Figure 2b is a bottom perspective view of the snap-fit ​​coupled cap of the shoelace tightening device according to the present invention; Figure 2c is a bottom perspective view of the snap-fit ​​coupled fixed housing of the shoelace tightening device according to the present invention; Figure 3 is a plan coupling view of the cap and tension shaft of the shoelace tightening device according to the present invention; Figure 4 is a plan coupling view showing the coupling state of the tension shaft for unidirectional rotation and the fixed housing of the shoelace tightening device according to the present invention; Figure 5 is a coupled cross-sectional view showing the coupling state of the tension shaft and winding drum of the shoelace tightening device according to the present invention; and Figures 6a and 6b are coupled side cross-sectional views showing the operating state of the vertical movement structure by snap-fit ​​coupling and tension shaft coupling of the shoelace tightening device according to the present invention.

[0034] Here, the illustrated example shows the shoelace tightening device 100 being installed on a shoe, but it can be applied to a variety of fastening devices that can be used on items such as hats, belts, gloves, bags, water skis, snowboards, and other items that are worn by tightening wires or laces, as well as sports equipment.

[0035] As shown in the figure, the shoelace tightening device 100 according to the present invention has a fixed housing 10 having a cylindrical housing portion 11 with an open top, and tension reverse rotation prevention sawtooth 12 formed on the upper inner circumferential surface; a tension coupling sawtooth 21 formed on the lower side so as to be able to rotate in one direction relative to the winding drum 30, and a tension shaft 22 formed which extends downward from the center and is coupled so as to be movable up and down in the axial direction, and at least one or more latch portions 23 having tension that engage with the tension reverse rotation prevention sawtooth 12 around the outside of the tension coupling sawtooth; The device comprises: a rotating tension section 20 in which a tension rod is formed; a winding drum 30 which is inserted into the housing section 11 and has drum coupling teeth 31 that mesh with the tension coupling teeth 21 of the rotating tension section 20, a shaft coupling hole 32 in which the tension shaft 22 is formed to be vertically movable in the center, and a winding section 33 in which the shoelace is wound up or unwound; and a cap 40 which is coupled to the upper side of the rotating tension section 20 and fixedly supported on the rotating tension section to serve as a handle, and snap-fits to the fixed housing 10.

[0036] Herein, the main feature of the present invention is that, as shown in Figures 2a to 2c, a detachment prevention step 14 is formed protruding outward from the upper outer peripheral surface of the fixed housing 10, and the area around the cap 40 extends downward to form a space below, but a part of the extended end extends again radially inward for a predetermined length to form a coupling step 41, and through the snap-fit ​​coupling of the detachment prevention step 14 and the coupling step 41, the cap 40, which is fixedly supported by the rotating tension part 20 when the shoelace is unwound, plays the role of preventing the cap 40 from detaching from the fixed housing 10.

[0037] In other words, the coupling step 41 of the cap 40 interacts with the detachment prevention step 14, which is formed to protrude outward from the upper outer peripheral surface of the fixed housing 10, by a snap-fit ​​connection with a vertically separated gap between them. When the rotating tension part 20, which is coupled to the fixed housing 10, moves upward in the axial direction to unwind the shoelace, the snap-fit ​​connection prevents the rotating tension part 20 and the cap 40, which operate together, from detaching from the fixed housing 10 (see Figure 6b).

[0038] The detachment prevention step 14 is provided with an annular fitting projection 14-1 formed at its bottom end, and the coupling step 41 is formed of one or more flanges that protrude radially inward, so that when the shoelace is unwound, the annular fitting projection 14-1 fits into the flange (see Figures 2b and 2c).

[0039] Therefore, the annular fitting projection 14-1 of the detachment prevention step 14 and the coupling step 41, which has the shape of one or more radial flanges, are formed to snap-fit ​​with a spaced gap between them, so that when the rotating tension part 20 coupled to the fixed housing 10 for winding the shoelace moves downward in the axial direction, they are spaced apart with a gap between them, and when the rotating tension part 20 coupled to the fixed housing 10 for unwinding the shoelace moves upward in the axial direction, the coupling between them prevents the rotating tension part 20 and the cap 40, which operate together, from detaching from the fixed housing 10 (see Figures 6a and 6b).

[0040] Of course, the detachment prevention step 14 may be formed by one or more flanges projecting radially inward, or annular fitting projections may be formed on the coupling step 41 to snap-fit ​​together with each other.

[0041] As shown in Figures 1a and 1b, the fixed housing 10 has a cylindrical housing portion 11 with an open top inside, and tension reverse rotation prevention sawtooth 12 is formed on the upper inner surface of the cylindrical housing portion 11.

[0042] Furthermore, a hook coupling projection 15 is formed on the lower part of the fixed housing 10, and is positioned to be assembled and fastened together via a hook coupling, corresponding to a hook locking step 52 formed on the upper end of the base 50 for attaching and fixing the shoelace tightening device 100 to an object to be attached, such as a shoe (see Figure 1b).

[0043] In the illustrated example, the fixed housing 10 and base 50 are shown as two separate components fastened together; however, they can, of course, be manufactured as a single integrated unit.

[0044] Two shoelace passage gongs (not shown) may be formed on the side surface of the fixed housing 10, spaced apart from each other, through which shoelaces (not shown) can be pulled out from the cylindrical housing portion 11 to the outside of the fixed housing 10.

[0045] The upper inner periphery of the fixed housing 10 is provided with tension reverse rotation prevention saw teeth 12, which are machined to allow rotation of the rotation tension portion 20 only in one direction (forward direction) when it engages with the latch portion 23 of the rotation tension portion 20, thereby preventing reverse rotation of the latch portion 23.

[0046] The lower end of the tension-reverse rotation-preventing sawtooth 12 of the fixed housing 10 is provided with a flow-preventing step (13; see Figure 1b) that extends radially inward along the inner circumferential surface, which serves to prevent the winding drum 30 inserted into the cylindrical housing 11 from detaching from the cylindrical housing 11.

[0047] On the other hand, as mentioned above, the upper outer peripheral surface of the fixed housing 10 is provided with a detachment prevention step 14 which extends outward and has an annular fitting projection 14-1 on its bottom surface. This is snap-fit ​​connected to the protruding flange-shaped coupling step 41 of the cap 40 with an upper and lower gap, and serves to prevent the rotating tension part 20 and the cap 40, which operate together, from detaching from the fixed housing 10 (see Figures 2a to 2c).

[0048] The base 50 is intended to attach to and fix to an object such as a shoe, and is equipped with a flange (51; see Figure 1a, etc.) that is roughly plate-shaped.

[0049] As described above, a hook locking step 52 is formed at the upper end of the base 50, and a hook coupling projection 15 is attached to the lower part of the corresponding fixed housing 10, and the two are assembled and fastened together via hook coupling (see Figure 1b).

[0050] Of course, although they are shown as separate components in the illustrated example, the fixed housing 10 and the base 50 may be manufactured as a single integrated unit.

[0051] The rotating tension section 20 is connected to the lower winding drum 30 so as to be able to rotate in the forward direction in a tightening direction by receiving the rotational force transmitted from the cap 40, which acts as a handle when winding the shoelace.

[0052] As shown in Figures 1a, 1b, and 3, the rotating tension section 20 has a very simple disc structure compared to conventional complex cylindrical rotating housings, and includes tension coupling sawtooth 21, tension shaft 22, and latch section 23.

[0053] Here, the tension shafts 22 extend downward in the axial direction from the lower center of the rotating tension section 20, and at least one (in the illustrated example, three are arranged at predetermined angles in the arc direction) is provided, but each tension shaft 22 has a structure that allows it to be elastically deflected radially inward or outward.

[0054] In other words, the rotating tension section 20 has tension coupling serrations (21; see Figure 1b) formed on one side of its lower surface so as to allow unidirectional rotation relative to the winding drum 30, and a tension shaft 22 having a protrusion 22-1 on the outer peripheral edge of its lower end is formed as an extension protruding downward from the center of the lower part.

[0055] Furthermore, the rotational tension section 20 is equipped with at least one dog (in the illustrated example, three are arranged at predetermined angles in the arc direction) latch section 23 that can be elastically deflected radially inward or outward around the outer periphery of the tension coupling saw teeth 13.

[0056] As shown in Figure 4, the latch portion 23 consists of a strip-shaped latch arm 23a extending in a substantially arc shape and a stop tooth-shaped portion 23b formed in the shape of a sawtooth at the end of the latch arm 23a. The sawtooth shape of the stop tooth-shaped portion 23b is machined to allow rotation in only one direction, corresponding to the shape of the tension reverse rotation prevention sawtooth 12.

[0057] The tension-coupled sawtooth 21 interacts with the drum-coupled sawtooth 31 of the winding drum 30, which will be described later, and is formed in the shape of circular sawtooth teeth.

[0058] As shown in Figure 4, an intermediate sawtooth portion 23c that engages with the tension coupling sawtooth 13 is formed between the retaining tooth profile portion 23b and the latch arm 23a, thereby reducing the risk of damage due to the restriction of rotation in only one direction.

[0059] Furthermore, as shown in Figure 3, a hook locking groove 24 is formed at the tip of the latch portion 23, and a cap locking portion 42 formed on the inner bottom surface of the cap 40 (described later) is inserted into it and fixedly supported, so that it can operate together when winding or unwinding the shoelace with a simple hook assembly.

[0060] The cap 40 is coupled to the upper side of the rotating tension section 20 and performs the function of a handle. That is, as shown in Figure 3, etc., a cap locking portion 42 is formed protruding downward from the inner bottom surface of the cap 40 which acts as a handle, and is inserted into a hook locking groove 24 formed at the tip of the corresponding latch portion 23 of the rotating tension section 20, and is fixedly supported so that it can operate together when winding or unwinding the shoelace.

[0061] Here, an example is shown in which three cap locking portions 42 are arranged on the inner bottom surface of the cap 40 at a predetermined angle in the arc direction, and three corresponding hook locking grooves 24 are arranged at a predetermined angle in the arc direction. However, this does not limit the number of cap locking portions 42 and hook locking grooves 24.

[0062] On the other hand, as shown in Figures 2a to 2c, the area around the cap 40 extends downward to form a space below, and a portion of the extended end extends radially inward for a predetermined length to form a connecting step 41. At this time, the connecting step 41 may be one or more flanges (in the illustrated example, three are arranged at predetermined angles in the arc direction) that project radially inward.

[0063] Therefore, as described above, the annular fitting projection 14-1 of the detachment prevention step 14 of the fixed housing and the coupling step 41, which has the shape of one or more radial flanges, are formed to snap-fit ​​together with a spaced gap to assemble the fixed housing 10 and the rotary tension part 20 of the shoelace tightening device. When the rotary tension part 20 coupled to the fixed housing 10 moves downward in the axial direction to wind up the shoelace, they are separated from each other with a gap, and when the rotary tension part 20 coupled to the fixed housing 10 moves upward in the axial direction to unwind the shoelace, the coupling prevents the rotary tension part 20 and the cap 40, which operate together, from detaching from the fixed housing 10.

[0064] On the other hand, as shown in Figures 1a, 1b, and 5, the winding drum 30 is rotatably inserted into the cylindrical housing portion 11 of the fixed housing 10 and includes drum coupling teeth (31; see Figure 1a) that mesh with the tension coupling teeth (21; see Figure 1b) of the rotating tension portion 20, a shaft coupling hole 32 formed in the center of the interior so that the tension shaft 22 can move up and down, and a winding portion 33 into which the shoelace is wound or unwound.

[0065] As shown in Figure 1b and other figures, a shaft coupling hole 32 is formed inside the center of the winding drum 30 so that the tension shaft 22 can move up and down, and the winding drum 30 can rotate in one permitted direction with the tension shaft 22 of the rotating tension section 20 as the axis of rotation.

[0066] On the other hand, as shown in Figure 5 and other figures, the winding drum 30 has a locking portion 32-1 that protrudes inward in the diametrical direction across the shaft coupling hole 32, and plays the role of supporting the protrusion 22-1 formed on the tension shaft 22 when the rotational tension portion 20 is moved upward or downward in the axial direction.

[0067] Furthermore, drum coupling saw teeth 31 are formed on the upper surface of the winding drum 30, which interact with each other in accordance with the tension coupling saw teeth 21 of the rotational tension section 20. Multiple such saw teeth are formed in a circular shape around the disc portion on the upper surface of the winding drum 30.

[0068] The winding section 33 has shoelace fixing holes (not numbered in the drawing) for tying and securing the ends of the shoelaces to the winding drum 30.

[0069] Furthermore, the winding drum 30 has disc-shaped circular sections (not assigned a drawing number) that are spaced apart from each other on either side of the winding section 33. These sections prevent the shoelace being wound from moving arbitrarily above or below the winding section 33, ensuring that the shoelace is neatly wound onto the winding section 33 and neatly released from the winding section 33.

[0070] Figure 6a is a cross-sectional view of the coupling side showing the position where the rotating tension unit 20 is moved downward in the axial direction, i.e., the state for winding shoelaces onto the winding drum 30, and Figure 6b is a cross-sectional view of the coupling side showing the position where the rotating tension unit 20 is moved upward in the axial direction, i.e., the state for unwinding shoelaces from the winding drum 30.

[0071] First, as shown in Figure 6a, when the rotary tension section 20 is moved downward in the axial direction, the latch section 23 engages with the tension reverse rotation prevention saw teeth 12, allowing the rotary tension section 20 to rotate in only one direction. At the same time, the tension coupling saw teeth 13 engage with the drum coupling saw teeth 21, and the protruding section 22-1 is positioned below the locking section 32-1. In this state, the user can rotate the rotary tension section 20 in one direction to wind the shoelace onto the winding drum 30.

[0072] At this time, the annular fitting projection 14-1 of the detachment prevention step 14 and the coupling step 41, which has the shape of one or more radial flanges, are separated from each other with a gap that is separated vertically.

[0073] As shown in Figure 6b, when the rotation tension section 20 is moved upward in the axial direction, the latch section 23 and the tension coupling saw teeth 21 are separated from the tension reverse rotation prevention saw teeth 12 and the drum coupling saw teeth 31, respectively, and the protrusion 22-1 is located above the locking section 32-1. In this state, there is no restriction on the rotation of the winding drum 30, so the user can pull the shoelace to release it from the winding drum 30.

[0074] Therefore, as long as the tension coupling saw teeth 21 are separated from the drum coupling saw teeth 31 when the rotation tension section 20 is moved upward in the axial direction, there are no restrictions on the rotation of the winding drum 30, and the user can pull the shoelace to unwind it from the winding drum 30.

[0075] At this time, the annular fitting projection 14-1 of the detachment prevention step 14 and the coupling step 41, which has the shape of one or more radial flanges, are separated with a gap between them. As the flange-shaped coupling step 41 moves upward, the gap disappears, and the annular fitting projection 14-1 fits into the flange and they are coupled together, so that the rotating tension part 20 and the cap 40, which operate together, do not detach from the fixed housing 10.

[0076] Furthermore, since the tension shaft 22 has a structure that provides elastic force radially inward or outward, the phenomenon of the protruding portion 22-1 being arbitrarily released when it is located below or above the locking portion 32-1 can be prevented.

[0077] Although embodiments of the present invention have been described in detail above, this is merely a description of one embodiment to enable a person with ordinary skill in the art to which the present invention belongs to to be able to easily implement the present invention. Therefore, the technical idea of ​​the present invention should not be interpreted restrictively based on the description of the above embodiments. [Explanation of Symbols]

[0078] 100: Shoelace tightening device 10: Fixed Housing 11: Cylindrical housing 12: Tension reverse rotation prevention sawtooth 13: Flow prevention stage 14: Detachment prevention step 14-1: Annular interlocking projection 15: Hook-connecting projection 20: Rotating tension section 21: Tension-coupled serrations 22: Tension shaft 22-1:Protrusion 23: Latch section 23a: Latch arm 23b: Retaining tooth profile 23c: Intermediate serrations 24: Hook locking groove 30: Reel Drum 31: Drum-jointed sawtooth 32: Shaft coupling hole 32-1: Locking part 33: Winding section 40: Cap 41: Flange 42: Cap locking part 50: Bass 51: Flange 52: Hook locking section

Claims

1. In a shoelace tightening device, A fixed housing having a cylindrical housing section with an open top inside, and a tension-reverse rotation prevention sawtooth formed on the inner surface of the upper section; A rotational tension unit comprising: tension coupling saw teeth formed on the lower side to allow unidirectional rotation relative to the winding drum; a tension shaft extending downward from the center and coupled to be movable vertically in the axial direction; and at least one latch portion having tension that engages with the tension reverse rotation prevention saw teeth around the outer periphery of the tension coupling saw teeth; A winding drum that is inserted into the housing and comprises a drum coupling sawtooth that engages with the tension coupling sawtooth of the rotating tension section, a shaft coupling hole formed in the center of the interior so that the tension shaft can move up and down, and a winding section into which the shoelace is wound or unwound; and A shoelace tightening device characterized by including a cap that is fixedly supported on the rotating tension part so as to be coupled to the upper side of the rotating tension part and act as a handle, and that snap-fits with the fixing housing to prevent the shoelace from detaching from the fixing housing when the shoelace is unwound.

2. The shoelace fastening device according to claim 1, characterized in that a detachment prevention step is formed protruding outward from the outer peripheral surface of the upper end of the fixed housing, the area around the cap extends downward to form a space below, but a portion of the extended end extends radially inward again by a predetermined length to form a connecting step, and the detachment prevention step and the connecting step are snap-fit ​​connected with a gap separated vertically.

3. The shoelace tightening device according to claim 2, characterized in that the detachment prevention step is provided with an annular fitting projection formed at the bottom end thereof, and the coupling step is formed of one or more flanges that protrude radially inward, so that the annular fitting projection fits into the flange when the shoelace is unwound.

4. The shoelace tightening device according to claim 1, characterized in that a cap locking portion is formed to protrude downward from the inner bottom surface of the cap, a hook locking groove is formed at the tip of the corresponding latch portion of the rotating tension portion, the cap locking portion is inserted into and fixed in the hook locking groove, and the cap and the rotating tension portion operate together when the shoelace is wound up or unwound.

5. The aforementioned latching portion is: A strip-shaped latch arm extending in an arc: A stop tooth profile formed at the end of the latch arm with a sawtooth shape corresponding to the shape of the tension-reverse rotation-preventing sawtooth of the fixed housing; and The shoelace tightening device according to claim 1, characterized in that it includes an intermediate sawtooth portion formed between the stopper tooth profile and the latch arm by engaging with the tension coupling sawtooth.

6. Furthermore, the shoelace tightening device according to claim 1 is characterized in that a hook coupling projection is formed on the lower part of the fixed housing, and a hook locking step is formed on the upper end of the base, and the fixed housing and the base are assembled and fastened to each other through the hook coupling.

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