Apparatus for tightening string including split-structure tightening cap

Abstract

The present invention relates to a strap tightening device that prevents the tightening cap from rising even if an upward force is unintentionally applied to the tightening cap, wherein a locking tab is installed in the housing, and the tightening cap includes a rotating member and a lifting member, wherein the rotating member can be grasped and rotated by a user on the outer surface of the housing but is prevented from rising by being caught on the locking tab, and the lifting member is equipped with a tightening tooth that rises and falls on the rotating member and engages with a winding wheel, so that when rising, the winding wheel and the tightening tooth are separated from each other, and when falling, the winding wheel and the tightening tooth are engaged with each other.

Description

Technology Field

[0001] The present invention relates to a strap tightening device having a split-structure tightening cap, wherein the device facilitates easy operation of tightening or loosening a strap to allow a user to easily wear and remove shoes, bags, hats, clothing, etc., and the tightening cap, which is held and rotated by the user, has a split structure to enable accurate operation during use. Background Technology

[0002] To eliminate the hassle of tying or untying shoelaces, a lace tightening device that can easily tighten or untie the laces is widely known, and such lace tightening devices are installed not only on shoes but also on bags, hats, and clothing and are used for tightening or untying laces.

[0003] FIG. 1 illustrates a conventional strap tightening device, as described in Korean Registered Patent Publication No. 10-2160426.

[0004] Referring to FIG. 1, the string tightening device comprises a housing (101) having an internal space, a tightening cap (104) coupled to the upper part of the housing (10) and capable of vertical movement, a winding wheel (102) located in the internal space and winding the string, and a rotation control member (103) coupled to the winding wheel (102) and coupled to the tightening cap (104) to control the rotation of the winding wheel and move vertically together.

[0005] The upper tightening cap (104) has a cylindrical shape that covers the top of the housing (101), and a plurality of limiting protrusions (104a) are formed at predetermined intervals around the bottom circumference so that they engage with the limiting protrusions (101a) of the housing (101), allowing the tightening cap (104) to move up and down in a connected state so that it does not fall out upward.

[0006] A user who tightens or loosens the laces of shoes, etc., can tighten the laces by lowering the tightening cap (104) and then grasping the outer surface of the tightening cap (104) with their fingers and rotating it, causing the winding wheel (102) to rotate together and wind up the laces, thereby tightening the laces.

[0007] However, it is not uncommon for a user to apply an upward force along with rotational force to the tightening cap (104) unconsciously or by mistake while tightening the laces of shoes, etc., and as a result, during the operation of tightening the laces by rotating the tightening cap (104), an upward movement of the tightening cap (104) occurs, causing the lace wound on the winding wheel (102) to unravel again.

[0008] That is, during the process of tightening the string while rotating the tightening cap (104), if the user's finger force is unintentionally applied upward to the tightening cap (104) and the tightening cap (104) rises, the tightening cap (104) becomes separated from the winding wheel (102) and becomes free in the direction in which the winding wheel (102) unwinds, and the wound string is unwound again to the outside.

[0009] This is due to a mistake made by the user while turning the tightening cap (104) quickly or due to individual movement characteristics. Prior art literature

[0010] Korean Registered Patent Publication No. 10-2160426 Korean Registered Patent Publication No. 10-2943805 The problem to be solved

[0011] The present invention has been conceived in the above regard, and the objective of the present invention is to provide a strap tightening device that prevents the tightening cap from rising and prevents the tightened strap from loosening again, even if a user unintentionally applies upward force to the tightening cap while grasping and rotating the cap with their fingers to tighten the strap. means of solving the problem

[0012] Accordingly, the present invention comprises a cord tightening device including: a housing having an internal space; a winding wheel located in the internal space and having a winding groove formed on its outer surface for winding a cord; and a tightening cap covering the top of the housing and operating to rotate the winding wheel in a winding direction or to unwind the cord by the winding wheel. The device is characterized in that the housing has a stopper installed thereon, and the tightening cap includes a rotating member and a lifting member assembled together. The rotating member can be grasped and rotated by a user on the outer surface of the housing, but is prevented from rising by being caught on the stopper. The lifting member is equipped with a tightening tooth that is coupled to the winding wheel to move up and down on the rotating member and to rotate the winding wheel, wherein the winding wheel and the tightening tooth are separated from each other when rising, and the winding wheel and the tightening tooth are coupled to each other when falling. The gripping surface of the rotating member, which can be grasped by a user while the lifting member is assembled to the rotating member, is exposed to the outside.

[0013] In addition, in another aspect, the present invention comprises: a housing in which a cylindrical wall forms an internal space; and a winding wheel that rotates in the internal space and has a winding groove formed on its outer surface around which a string is wound. A clamping cap installed on the upper part of the housing and equipped with a clamping tooth to engage with the winding wheel and rotate the winding wheel; wherein the clamping cap comprises a rotating member and a lifting member assembled together, the rotating member is installed around the outer circumference of the upper part of the housing so that a user can grasp it and rotate it relative to the housing, but upward movement is prevented by being caught on the housing, the lifting member comprises a plurality of assembly legs and the clamping tooth, and the lifting member moves up and down relative to the rotating member with the plurality of assembly legs coupled to the rotating member on the upper side of the rotating member, and when lowering, the clamping tooth engages with the winding wheel so that the winding wheel can wind up a string by rotating the clamping cap, and when rising, the clamping tooth separates from the winding wheel so that the winding wheel can unwind the string, and the gripping surface of the rotating member is exposed so that a user can grasp the gripping surface and rotate the rotating member, and the rotating member and the lifting member rotate together. does.

[0014] In addition, the present invention, in another aspect, comprises: a housing in which a cylindrical wall forms an internal space; and a winding wheel located in the internal space, having a winding groove formed on its outer surface for winding a string, which rotates to wind up the string. The device includes a tightening cap that covers the top of the housing and can be rotated to allow the winding wheel to wind up a string when engaged with the winding wheel; wherein the tightening cap is divided into a rotating member and a lifting member, the rotating member is installed in an annular shape to surround the outer surface of the housing and rotates around the housing but is prevented from rising by being caught on the housing, the lifting member is coupled to the rotating member to rise and fall relative to the rotating member, and when rising, the coupling with the winding wheel is released to allow the winding wheel to unwind the string, and the rotating member has a gripping surface exposed to the outside, and when a user grasps the gripping surface and rotates the rotating member while the lifting member is in a lowered state, the lifting member rotates together, causing the winding wheel to rotate to wind up the string.

[0015] In the present invention described above, one of the rotating member and the lifting member is formed with a plurality of assembly legs and a snap projection is formed at the end of each of the plurality of assembly legs, and the other is formed with a guide groove corresponding to each of the plurality of assembly legs, so that the assembly legs are guided to move up and down by the guide groove, and a snap tab is formed at the end of the guide groove to snap-couple the snap projection so that the snap projection is seated in the guide groove and the snap projection is caught so as not to detach from the guide groove. Effects of the invention

[0016] The cord tightening device according to the present invention comprises a housing, a winding wheel inside the housing, and a tightening cap at the top of the housing. The tightening cap comprises a rotating member and a lifting member. The rotating member can be grasped and rotated by a user on the outer surface of the housing, but is prevented from rising by the housing. The lifting member is configured to move up and down on the rotating member and to be coupled with the winding wheel to rotate the winding wheel.

[0017] Accordingly, when the user raises the rising member, the winding wheel and the tightening cap are separated from each other, and when lowering, the rising member descends so that the winding wheel and the tightening cap are engaged with each other, and when the user grasps the gripping surface of the rotating member and rotates it, the rising member is coupled with the winding wheel, allowing the winding wheel to be rotated in a tightening direction.

[0018] Since the user holds the gripping surface of the rotating member of the tightening cap when rotating it to tighten the strap, even if an upward force is unintentionally applied to the tightening cap while holding and rotating it with a finger, the rotating member cannot rise due to the housing, thereby preventing the tightening cap from rising and preventing the tightened strap from loosening again.

[0019] In addition, when unwinding the string, the lifting member of the tightening cap is grasped and raised to separate the tightening cap from the winding wheel, so the winding wheel can smoothly operate to unwind the string. Brief explanation of the drawing

[0020] FIG. 1 is an explanatory diagram of the configuration of a conventional strap tightening device. FIG. 2 is an exploded perspective view showing the top surface of a strap tightening device according to an embodiment of the present invention in an exploded state. FIG. 3 is an exploded perspective view showing the bottom surface of a strap tightening device according to an embodiment of the present invention in an exploded state. FIG. 4 is a cross-sectional view illustrating the state in which the tightening cap is lowered while the strap tightening device according to an embodiment of the present invention is assembled. FIG. 5 is a cross-sectional view illustrating the state in which the tightening cap is raised while the strap tightening device according to an embodiment of the present invention is assembled. FIG. 6 is an exploded perspective view showing the top surface of a strap tightening device according to another embodiment of the present invention in an exploded state. FIG. 7 is an exploded perspective view showing the bottom surface of a strap tightening device according to another embodiment of the present invention in an exploded state. FIG. 8 is a cross-sectional view illustrating a state in which the tightening cap is lowered while the strap tightening device according to another embodiment of the present invention is assembled. FIG. 9 is a cross-sectional view illustrating a state in which the tightening cap is raised while the strap tightening device according to another embodiment of the present invention is assembled. Specific details for implementing the invention

[0021] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0022] Referring to FIGS. 2 to 5, a string tightening device according to an embodiment of the present invention comprises a housing (10) having an internal space (11), a winding wheel (20) located in the internal space (11) and having a winding groove (21) formed on its outer surface for winding a string, and a tightening cap (30) that covers the top of the housing (10) and allows the winding wheel (20) to be rotated in a winding direction as the user rotates it, and allows the winding wheel (20) to unwind the string when the user raises it to separate it from the winding wheel (20).

[0023] The above housing (10) is a part that is detachably fixed to a base member (60) attached to a shoe, wherein a cylindrical wall (15) forms an internal space (11) in which a winding wheel (20) and a rotation control member (40) are located, and a string entry port (14) for a string to enter and exit is installed in the cylindrical wall (15). The housing (10) protects internal components and supports a tightening cap (30) that is coupled to the top.

[0024] A catch (13) is installed in the housing (10) so that the rotating member (32) of the tightening cap (30), which will be described later, catches on it, thereby allowing the rotating member (32) to rotate but preventing the rotating member (32) from rising. The catch (13) is preferably installed on the upper part of the outer surface of the cylindrical wall (15) of the housing (10) and is installed to protrude in an annular shape.

[0025] The above-mentioned stopper (13) is a means of preventing the rotational member (32) of the tightening cap (30) from rising while allowing the rotational member (32) to rotate around the housing (10), so its shape does not have to be annular, and it can be modified into various structures such as a groove, a stepped stopper, or a protrusion where the rotational member (32) is caught.

[0026] The above-mentioned winding wheel (20) is located in the internal space (11) of the housing (10) and has a winding groove (21) formed on its outer surface for winding a string, and rotates to wind or unwind the string.

[0027] A connecting tooth (23) is formed on the upper part of the winding wheel (20) so that it can be connected to and separated from the tightening tooth (37) of the tightening cap (30). When the tightening cap (30) is rotated according to the connection, the winding wheel (20) can rotate together in the direction of winding and tightening the string.

[0028] The tightening cap (30) is installed on the top of the housing (10) and can be tightened by the user holding it with their fingers and rotating it to wind up the string.

[0029] A clamping tooth (37) for rotating the winding wheel (20) is installed on the lower surface of the clamping cap (30) facing the winding wheel (20). The clamping tooth (37) is substantially engaged with the winding wheel (20) to rotate the winding wheel (20), and when the clamping cap (30) is raised, the clamping tooth (37) is separated from the winding wheel (20).

[0030] Since the clamping teeth (37) are a means for interlocking with each other to transmit rotation by contacting the upper part of the winding wheel (20), the shape of a jaw or protrusion capable of transmitting rotation is also included in the clamping teeth (37) of the present invention.

[0031] The above tightening cap (30) includes a rotating member (32) and a lifting member (31) which are separate members, and is assembled and combined with each other to form a tightening cap (30) that rotates together.

[0032] The above-mentioned rotating member (32) is an annular shape that surrounds the cylindrical wall (15) of the housing (10) and is installed annularly around the housing (10) at the outer circumference of the upper part of the housing (10) so that a user can grasp it and rotate it relative to the housing (10), but it is prevented from rising by being caught on the catch (13) of the housing (10).

[0033] In the structure of Fig. 3, the annular rotating member (32) can be coupled to the housing (10) by forcibly pressing the support jaw (39) over the catch jaw (13) of the housing (10) due to the elasticity of the material.

[0034] The outer surface of the annular rotating member (32) has irregularities formed thereon to become a gripping surface (32a) that the user grasps.

[0035] The lifting member (31) is located on the upper side of the rotating member (32) and includes a plurality of assembly legs (34) and a clamping tooth (37). In this embodiment, the lifting member (31) is formed in a disc shape that covers the housing (10) from the upper side, but other shapes such as a square plate, a triangular plate, or an elliptical plate are acceptable, and it is sufficient if the shape is such that a user can grasp and lift it.

[0036] The assembly of the rotating member (32) and the lifting member (31) is achieved by connecting a plurality of assembly legs (34) of the lifting member (31) to the rotating member (32). That is, the lifting member (31) has a plurality of assembly legs (34) extending downward at predetermined intervals around the outer circumference, and a snap projection (35) is formed at the bottom of the assembly leg (34). The rotating member (32) has a guide groove (36) corresponding to the assembly leg (34) formed on its outer circumference, and a snap jaw (38) is formed at the upper end of the guide groove (36), so that the snap projection (35) passes over the snap jaw (38), and the rotating member (32) and the lifting member (31) are assembled and connected by a snap connection.

[0037] In the assembled state, the snap projection (35) is snap-coupled so that the snap projection (35) is seated in the guide groove (36), and the assembly leg (34) is guided to move up and down by the guide groove (36). A snap jaw (38) is placed at the upper end of the guide groove (36) to prevent the snap projection (35) from moving upward from the guide groove (36), so that when the snap projection (35) rises, it gets caught on the snap jaw (38).

[0038] Accordingly, the lifting member (31) can rise and fall relative to the rotating member (32) with a plurality of assembly legs (34) connected to the rotating member (32) on the upper side of the rotating member (32).

[0039] For reference, a snap fastening refers to a type of connection where the teeth are bent backward due to elastic deformation as they slide over the jaw, and then restored by elasticity immediately after sliding over, settling into place to engage the teeth and jaw.

[0040] In this embodiment, the guide groove (36) of the rotating member (32) and the assembly leg (34) of the lifting member (31) are snap-fastened to each other to form an assembly, and the lifting member (31) moves up and down along the guide groove (36) relative to the rotating member (32). However, this configuration may be replaced with a configuration in which an up-and-down guide projection or an up-and-down guide column, which guides the up-and-down movement of the lifting member (31) as in the guide groove (36), is installed on the rotating member (32), and the lifting member (31) moves up and down while sliding up and down on the rotating member (32) by engaging with the up-and-down guide projection or the up-and-down guide column.

[0041] In addition, the aforementioned plurality of assembly legs (34) and the corresponding guide grooves (36) may be installed on the rotating member (32) and the lifting member (31), respectively, by swapping their positions.

[0042] Additionally, the aforementioned plurality of assembly legs (34) and the corresponding guide grooves (36) are installed to be assembled on the outer surface of the rotating member (32) in FIGS. 2 to 5 and partially cover the gripping surface (32a), but it is also possible to change the installation position of the plurality of assembly legs (34) so ​​that the guide grooves (36) are installed on the inner side or inner surface of the rotating member (32) so as not to cover the gripping surface (32a), and the plurality of assembly legs (34) are assembled into the guide grooves (36) on the inner side or inner surface of the rotating member (32) in correspondence with that position.

[0043] When the rotating member (32) and the lifting member (31) are assembled and combined, the rotating member (32) and the lifting member (31) must be constrained to each other by the assembly structure and rotate together, and the lifting member (31) must be able to move up and down relative to the rotating member (32).

[0044] In addition, in this embodiment, when the lifting member (31) is assembled to the rotating member (32), the gripping surface (32a) of the rotating member (32) is exposed to the outside between a plurality of assembly legs (34) so ​​that a user can grasp it. The gripping surface (32a) of the rotating member (32) is an annular outer surface, and it is preferable that the outer surface has irregularities to make it easy for the user to grasp.

[0045] Accordingly, the user can grasp the gripping surface (32a) and rotate the rotating member (32) on the outer surface of the housing (10), and when the rotating member (32) rotates, the lifting member (31) also rotates together. When the user grasps the gripping surface (32a) and rotates the rotating member (32), the winding wheel (20) can be rotated to wind up the string.

[0046] In order for the winding wheel (20) to unwind the string, the user grasps the exposed portion of the lifting member (31) and raises it. The user grasps the outer surface (31a) of the lifting member (31) with their fingers and raises the lifting member (31) relative to the rotating member (32). The outer surface (31a) of the lifting member (31) has a tapered surface formed as shown in FIG. 4, with the diameter increasing as it goes upward, to make it easier for the user to grasp and lift it.

[0047] At this time, the rotating member (32) is prevented from rising by being caught on the catch (13) of the housing (10), and only the lifting member (31) rises on the rotating member (32), and as the lifting member (31) rises, the tightening tooth (37) is separated from the winding wheel (20), so that the winding wheel (20) can unwind the string.

[0048] When the lifting member (31) descends, the winding wheel (20) and the tightening tooth (37) are coupled to each other, and the winding wheel (20) can wind up the string by rotating the tightening cap (30).

[0049] Meanwhile, in the internal space (11) of the housing (10), a rotation control member (40) is installed to control the rotation of the winding wheel (20) so that the winding wheel (20) is allowed to rotate in the direction of winding the string and stops rotation in the direction of unwinding the string.

[0050] FIGS. 2 to 5 illustrate a configuration in which a rotation control member (40) is positioned on the inner lower side of a winding wheel (20), and in another embodiment described later, as FIGS. 6 to 9, a different configuration in which a rotation control member (40) is positioned on the upper side of a winding wheel (20) is illustrated.

[0051] Referring to FIGS. 2 to 5, the rotation control member (40) is coupled with the winding wheel (20) and also coupled with the tightening cap (30), and moves up and down together with the lifting member (31) of the tightening cap (30) within the through hole (25). During the movement up and down, it is engaged with or separated from the stop tooth (63) of the base member (60) located at the bottom of the internal space (11) of the housing (10), thereby controlling the rotation of the winding wheel (20).

[0052] For this control action, the rotation control member (40) is equipped with a second ratchet part (46) that engages with the first ratchet part (26) to allow rotation of the winding wheel (20) in one direction and block rotation in the other direction, and has a gripping tooth (43) that engages with a stop tooth (63) at the bottom.

[0053] The rotation control member (40) is engaged with the first ratchet part (26) of the winding wheel (20) and is equipped with a second ratchet part (46) that allows rotation of the winding wheel (20) in one direction and blocks rotation in the other direction, and is equipped with a gripping tooth (43) at the lower end that engages with the stop tooth (63) at the bottom of the internal space (11), so that the rotation control member (40) engages with or is separated from the stop tooth (63) during the lifting motion.

[0054] The interlocking structure of the first ratchet part (26) and the second ratchet part (46) is configured such that the inclination direction of the ratchet teeth is set to allow the winding wheel (20) to rotate relatively to the rotation control member (40) in the direction of winding the string, and to block the rotation relatively to the direction of unwinding the string.

[0055] The second ratchet part (46) has a plurality of ratchet wings fixed in a swirling shape around the circumference of the rotation control member (40), and each ratchet wing is provided with a ratchet wing tooth that engages with the ratchet tooth of the first ratchet part (26) to form a ratchet connection at the free end of each ratchet wing.

[0056] Accordingly, when the rotation control member (40) descends and stops by being caught on the stop tooth (63) of the base member (60), and the tightening cap (30) rotates the winding wheel (20) in the direction of winding the string, the winding wheel (20) can rotate relative to the rotation control member (40) while the ratchet tooth of the first ratchet part (26) elastically deforms the ratchet wing of the second ratchet part (46) and rotates by riding over the ratchet wing tooth.

[0057] When the rotation control member (40) is engaged with the stop tooth (63) and the winding wheel (20) attempts to rotate in the opposite direction to the rotation control member (40) as described above, the ratchet tooth of the first ratchet part (26) engages with the ratchet wing tooth of the second ratchet part (46), thereby blocking the rotation.

[0058] When the rotation control member (40) rises and the gripping is released from the stop tooth (63), the string can be unwound from the winding wheel (20) by the force pulling the string from the outside.

[0059] The lifting member (31) and the rotation control member (40) of the tightening cap (30) can be raised together by the downward column (33) of the lifting member (31) and the upward projection (48) of the rotation control member (40) engaging with each other in the through hole (25) of the winding wheel (20).

[0060] Meanwhile, for the upward and downward operation of the lifting member (31) of the tightening cap (30), the raised portion (33a) formed on the downward column (33) of the tightening cap (30) moves up and down by contacting the elastic positioning portion (28) of the winding wheel (20), thereby setting the position of the lifting member (31) to the upward and downward position through the action of the elastically deforming positioning portion (28).

[0061] The positioning part (28) is formed in a state of upward protrusion around the upper circumference of the through hole (25) from the through hole (25), and is a part that opens or closes due to the elasticity of the material as the raised part (33a) moves up and down.

[0062] The lifting member (31) of the tightening cap (30) is coupled through the through hole (25) of the rotation control member (40) and the winding wheel (20) so that it can move up and down together with the rotation control member (40), but rotation of the rotation control member (40) is allowed. That is, the upward projection (48) of the rotation control member (40) and the downward column (33) of the lifting member (31) have a coupling structure in which they are engaged with each other, so that they are constrained to each other in the vertical direction and move up and down together, but allow relative rotation in the rotational direction.

[0063] When the lifting member (31) of the tightening cap (30) descends and rotates the winding wheel (20) so that the winding wheel (20) winds up the string, the tightening cap (30) can rotate without interference from the rotation control member (40).

[0064] The process of operating the strap tightening device of the present embodiment is described in more detail below.

[0065] First, to wind up and tighten the string, as shown in FIG. 4, when the user presses the lifting member (31) of the tightening cap (30) to lower it, the tightening tooth (37) is caught on the connecting tooth (23) of the winding wheel (20) by the lowering of the lifting member (31).

[0066] Subsequently, when the user grasps the gripping surface (32a) of the rotating member (32) and rotates it, the rotating member (32) and the lifting member (31) rotate together, rotating the winding wheel (20) and winding and tightening the string. At this time, since the lifting member (31) is assembled to the rotating member (32) and is constrained to rotate by the combination of the assembly leg (34) and the guide groove (36), the entire tightening cap (30) rotates.

[0067] In the event that the user unwittingly or incorrectly applies both rotational force and lifting force to the tightening cap (30) while rapidly rotating the tightening cap (30), the user holds the gripping surface (32a) of the rotating member (32) of the tightening cap (30) and rotates it, and the rotating member (32) is caught on the catch (13) of the housing (10) to prevent upward movement, so the risk of the tightening cap (30) rising and the winding wheel (20) transitioning to a state where it can unwind the string is prevented.

[0068] When the tightening cap (30) and the winding wheel (20) rotate in the direction of winding the string, the interlocking structure between the first ratchet part (26) of the winding wheel (20) and the second ratchet part (36) of the rotation control member (40) allows the winding wheel (20) to rotate relatively to the rotation control member (40) in the direction of winding the string. That is, with respect to the rotation control member (40) which is in a stopped state by being caught on the stop tooth (63) of the base member (60), the first ratchet part (26) of the winding wheel (20) rolls over the ratchet wing (36a) of the second ratchet part (36) of the rotation control member (40) while elastically deforming it, thereby enabling the winding wheel (20) to rotate.

[0069] In such a state, when the tightening cap (30) attempts to rotate the winding wheel (20) in the direction in which the string is unwound, or when the winding wheel (20) attempts to rotate in the direction in which the string is unwound due to an external force pulling the string, the first ratchet part (26) of the winding wheel (20) is caught on the stop tooth (63) of the base member (60) and the rotation control member (40) is stopped, thereby blocking rotation and preventing the string from being unwound.

[0070] Therefore, when the lifting member (31) and the rotation control member (40) of the tightening cap (30) are in a lowered state, the winding wheel (20) can only rotate in the direction of winding and tightening the string.

[0071] Meanwhile, to untie the strap, the user grasps the outer surface (31a) of the lifting member (31) of the tightening cap (30) and raises the lifting member (31).

[0072] Accordingly, the lifting member (31) moves upward under the guidance of the guide groove (36) of the rotating member (32), and the tightening tooth (37) of the lifting member (31) is separated from the winding wheel (20), and the rotation control member (40) is also separated from the stop tooth (63) of the base member (60), so that the winding wheel (20) can rotate freely and unwind the string.

[0073] When the downward column of the lifting member (31) moves up and down during the operation of the lifting member (31) to rise and fall, the position setting part (28), which is formed in a state of upward protrusion around the upper perimeter of the through hole (25) in the through hole (25), spreads apart or closes due to the elasticity of the synthetic resin material, thereby enabling a position setting that allows the lifting member (31) to stop at the rising and falling position.

[0074] Meanwhile, FIGS. 6 to 9 illustrate another configuration of a string tightening device in which a rotation control member (40) is located above the winding wheel (20) in the internal space (11) of the housing (10).

[0075] In this embodiment as well, the configuration in which the aforementioned tightening cap (30) is divided into a rotating member (32) and a lifting member (31) is applied in the same way.

[0076] The rotation control member (40) is annular and has a through hole (45) located in the center, and when the lifting member (31) is lowered, the tightening tooth (37) of the lifting member (31) can be engaged with the connecting tooth (23) of the winding wheel (20) through the through hole (45).

[0077] Additionally, the lifting member (31) is provided with a first ratchet part (31b) having ratchet teeth arranged in an annular shape on its lower surface, and ratchet-couples with the second ratchet part (46) of the rotation control member (40).

[0078] The rotation control member (40) is assembled to be coupled to the inner projection (18) of the housing (10) and its position is fixed in the internal space (11) of the housing (10). The rotation control member (40) is provided with a second ratchet part (46) having a plurality of ratchet wings in a swirling shape around its circumference, which engages with the first ratchet part (26) to allow rotation of the winding wheel (20) in one direction and block rotation in the other direction.

[0079] Accordingly, as shown in FIG. 8, when the user grasps the gripping surface (32a) of the rotating member (32) and rotates it while the lifting member (31) of the tightening cap (30) is lowered, the tightening teeth (37) of the lifting member (31) engage with the connecting teeth (23) of the winding wheel (20), allowing the tightening cap (30) to rotate the winding wheel (20) in the direction of winding the string. At this time, rotation in the direction of winding the string is allowed as the first ratchet part (31b) passes over the teeth of the second ratchet part (46).

[0080] When tension is applied to unravel the string at the lowered position of the lifting member (31) of the tightening cap (30), the connecting tooth (23) of the winding wheel (20) is engaged with the tightening tooth (37) of the lifting member (31), and the first ratchet part (31b) of the lifting member (31) is ratchet-coupled to the second ratchet part (46) of the rotation control member (40). Since the rotation control member (40) is fixed in position by the housing (10), rotation in the direction of unraveling the string is not allowed.

[0081] Meanwhile, to untie the string, the user moves the position of the fingers holding the string to grasp the outer surface (31a) of the lifting member (31) of the tightening cap (30) and raises the lifting member (31).

[0082] Accordingly, the tightening teeth (37) of the lifting member (31) and the first ratchet part (31b) are separated from the winding wheel (20) and the second ratchet part (46) of the rotation control member (40), respectively, and the winding wheel (20) is in a state where it can freely rotate and unwind the string.

[0083] Even if the user applies both rotational force and lifting force to the tightening cap (30) unconsciously or through incorrect operation while rotating the tightening cap (30) to tighten the string urgently, the user holds the gripping surface (32a) of the rotating member (32) of the tightening cap (30) and rotates it, and the rotating member (32) is caught on the catch (13) of the housing (10) so that upward movement is prevented and only rotation is possible, thus preventing the tightening cap (30) from rising and the winding wheel (20) from switching to a state where the string is unwound.

[0084] The position setting part (44) of the present embodiment is installed on the rotation control member (40) and comes into contact with the raised part (33a) of the lifting member (31), so that the raised part (33a) of the lifting member (31) moves over the position setting part (44) and stops at the rising or falling position.

[0085] Meanwhile, in the present invention, a component that mediates the connection between the lifting member (31) and the winding wheel (20) of the tightening cap (30) is included, so that when the lifting member (31) rises relative to the rotating member (32), the connection between the lifting member (31) and the winding wheel (20) via the mediating component is released, allowing the winding wheel to unwind the string, and when the lifting member (31) descends, the rotating member (32) and the lifting member (31) rotate together, and the lifting member (31) rotates so that the winding wheel (20) winds the string via the mediating component, which is another embodiment of the structure.

[0086] At this time, in the case where there is a mediating part between the lifting member (31) and the winding wheel (20), the state of being in a state of being uncoupled and coupled means that when the lifting member (31) rises, the winding wheel (20) can rotate without interference from the lifting member (31) because the lifting member (31) is separated from the mediating part or the mediating part is separated from the winding wheel (20), and when the lifting member (31) descends, the rotational force of the lifting member (31) is transmitted to the winding wheel (20) and the string can be wound because the mediating part is coupled with the lifting member (31) and the winding wheel (20). Explanation of the symbols

[0087] 10; Housing 11; Interior space 13; catch 14; string opening 15; cylindrical wall 20; winding wheel 21; winding groove 25; through hole 26; 1st ratchet part 28; positioning part 30; tightening cap 31; lifting member 31a; outer surface 31b; first ratchet part 32; rotating member 32a; gripping surface 33; downward column 33a; raised part 34; Assembly leg 35; Snap projection 36; Guide Home 37; Tightening 38; Snap jaw 39; Support jaw 40; rotation control member 43; interlocking tooth 44; Positioning section 45; Through hole 46; 2nd ratchet part 48; upward projection 60; base member 63; stop tooth

Claims

Claim 1 A cord tightening device comprising: a housing having an internal space; a winding wheel located in the internal space and having a winding groove formed on its outer surface for winding a cord; and a tightening cap covering the top of the housing and operating to rotate the winding wheel in a winding direction or to unwind the cord by the winding wheel; wherein the housing is provided with a stopper, and the tightening cap includes a rotating member and a lifting member assembled together; the rotating member can be grasped and rotated by a user on the outer surface of the housing, but is prevented from rising by being caught on the stopper; the lifting member is provided with a tightening tooth that engages with the winding wheel to rise and fall on the rotating member and to rotate the winding wheel, wherein the winding wheel and the tightening tooth are separated from each other when rising, and the winding wheel and the tightening tooth engage with each other when falling; and one of the rotating member and the lifting member has a plurality of assembly legs formed thereon, and the other has a guide groove formed thereon corresponding to each of the plurality of assembly legs, so that the assembly legs rise and fall by the guide groove and A strap tightening device characterized in that the rotating member and the lifting member are assembled by snap fastening to guide a downward movement, the gripping surface of the rotating member that a user can grasp is exposed to the outside when the lifting member is assembled to the rotating member, and the outer surface of the lifting member is exposed to the outside in the lowered state so that a user can grasp and lift the lifting member to raise it. Claim 2 A strap tightening device according to claim 1, characterized in that a snap projection is formed at the end of the plurality of assembly legs, and a snap tab is formed at the end of the guide groove so as to snap-couple the snap projection, the snap projection is seated in the guide groove, and the snap projection is caught so as not to detach from the guide groove. Claim 3 A housing in which a cylindrical wall forms an internal space; a winding wheel that rotates within the internal space and has a winding groove formed on its outer surface for winding a string; and a clamping cap installed on the upper end of the housing and equipped with a clamping tooth to engage with the winding wheel and rotate the winding wheel; wherein the clamping cap includes a rotating member and a lifting member assembled together, the rotating member is installed around the outer surface of the upper end of the housing so that a user can grasp it and rotate it relative to the housing, but is prevented from rising by being caught on the housing, the lifting member includes a plurality of assembly legs and the clamping tooth, and guide grooves corresponding to each of the plurality of assembly legs are formed in the rotating member, and the lifting member rises and falls relative to the rotating member from the upper side of the rotating member while the plurality of assembly legs are connected to the guide grooves of the rotating member by snap fastening, and when falling, the clamping tooth engages with the winding wheel so that the winding wheel can wind the string by rotating the clamping cap, and when rising, the clamping tooth A string tightening device characterized by being separated from a winding wheel so that the winding wheel can unwind the string, having a gripping surface of the rotating member exposed so that a user can grasp the gripping surface and rotate the rotating member, and having the rotating member and the lifting member rotate together, and having the outer surface of the lifting member exposed to the outside in a lowered state so that a user can grasp and lift the lifting member to raise it. Claim 4 A strap tightening device according to any one of claims 1 to 3, characterized in that the outer surface of the lifting member has a tapered surface formed such that the diameter increases toward the upper side to facilitate a user's grip and lifting. Claim 5 A strap tightening device according to claim 1 or 2, wherein the plurality of assembly legs are installed at predetermined intervals around the outer surface of the lifting member and are extended downward, the guide groove is formed on the outer surface of the rotating member, the gripping surface is exposed to the outside between the plurality of assembly legs, and the outer surface of the lifting member is exposed to the outside so that a user can grasp it from the upper side of the plurality of assembly legs.

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