Apparatus for tightening string including protective member of tightening cap

Abstract

The present invention relates to a strap tightening device having a protective member that protects a tightening cap from external impact force, and includes a protective member that is separated from a housing and coupled to a strap, wherein the protective member includes a lower strap coupling part having a passage hole formed therein through which a first strand and a second strand of the strap pass, and a protective part that rises upward from the strap coupling part to the position of the tightening cap and covers the front of the tightening cap.

Description

Technology Field

[0001] The present invention relates to a strap tightening device equipped with a tightening cap protection member, wherein the device facilitates easy operation of tightening or loosening the strap to allow a user to easily wear and remove shoes, bags, hats, clothing, etc., and the device has a strap tightening device in which the protection member protects the tightening cap from external impact to prevent the tightening cap from being damaged or separated. 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. 9 illustrates a conventional strap tightening device, as described in Korean Registered Patent Publication No. 10-2494446.

[0004] Referring to FIG. 9, the string tightening device (6) is provided with a tightening cap (1), a housing (2), a base member (3), and a spool inside the housing. The tightening cap (1) is rotatably coupled to the housing (2), and the rotation of the tightening cap (1) causes the spool to rotate in a first direction inside the housing (2) to wind up the string. When the tightening cap (1) is pulled upward and the coupling with the spool is released, the spool unwinds the string.

[0005] Above, the base member (3) includes a pair of axial extension walls (5) disposed on opposite sides of the base member (3). The extension walls (5) partially surround the housing (2) and the clamping cap (1) and protect the clamping cap (1) from external contact.

[0006] However, in the aforementioned conventional lace tightening device (6), the extension wall (5) is installed on the base member (3), thereby making the base member (3) thicker and increasing the area occupied on the upper of the shoe.

[0007] Such a problem is that when the area where the lace tightening device (6) can be installed is narrow depending on the type of shoe, the aforementioned base member (3) cannot be formed in a slim structure, so it is difficult to secure an attachment area on the upper of the shoe.

[0008] In addition, if the extension wall (5) in the base member (3) breaks or is damaged due to repeated impact from long-term use of the shoe, the lace tightening device (6) must be disassembled to replace the base member (3) or the base member (3) itself must be removed from the shoe and reinstalled in the shoe, so there is a problem that repair or replacement is difficult. Prior art literature

[0009] Korean Registered Patent Publication No. 10-2494446 Korean Registered Patent Publication No. 10-1810335 The problem to be solved

[0010] The present invention has been conceived in the above regard, and the objective of the present invention is to provide a strap tightening device equipped with a tightening cap protection member having a structure that allows the base member to be manufactured in a slim structure by installing a protection member that protects the tightening cap of the strap tightening device from external impact on the outer side of the base member, and allows for easy repair or replacement even if the protection member is damaged, as there is no need to disassemble or replace the entire tightening device. means of solving the problem

[0011] Accordingly, the present invention comprises a base member, a housing coupled to and fixed to the base member, a winding wheel on which a string is wound inside the housing, a tightening cap which operates to rotate the winding wheel in the direction of winding the string or to unwind the winding wheel while covering the top of the housing, and an access hole installed in the housing through which the string enters and exits the inside and outside of the housing according to the rotation of the winding wheel, thereby performing a tightening operation to wind and tension a string and a loosening operation to freely unwind the string, wherein the device comprises a protective member that is separated from the base member and the housing outside the base member and the housing, moves independently of the base member and the housing, and is coupled to the string, wherein the protective member comprises a lower string coupling part that is supported by the string when the string is tensioned while passing through the string through the through hole formed therein, and a protective part that rises upward from the string coupling part to the position of the tightening cap and covers the front of the tightening cap, thereby When the protective member receives the impact force directed toward the tightening cap at the front of the tightening cap, the upper part of the protective member is supported by the tightening cap and the lower part is supported by the base member or housing to disperse the impact force, and the tensioned cord can partially absorb the impact force received by the protective member.

[0012] In addition, the present invention is further characterized in that the protective part is in the shape of an arc that wraps around the front circumference of the tightening cap, and the angle range (α) of the area covered by the protective part among the circumference of the tightening cap is an angle range selected from 45° to 120° along the circumference of the tightening cap.

[0013] In addition, the present invention is further characterized in that the protective part rises to a height greater than the height of the middle part of the tightening cap based on the lowered state of the tightening cap.

[0014] In addition, the present invention is further characterized in that, among the two ends of the protective part, the end that the user's finger approaches and strikes along the direction of rotation of the tightening cap during the process of the user's finger grasping and rotating the tightening cap has an inclined ridge formed in a shape that lies obliquely in accordance with the direction of approach of the finger.

[0015] In addition, the present invention is further characterized in that the string comprises a first strand and a second strand, and the aforementioned entry / exit hole comprises a first entry / exit hole and a second entry / exit hole separated by a predetermined interval so that the first strand and the second strand each enter and exit the inside and outside of the housing.

[0016] In addition, the aforementioned through hole preferably includes a first through hole and a second through hole separated by a predetermined interval so that the first strand and the second strand each pass through.

[0017] Meanwhile, the present invention provides a shoe in which the aforementioned lace tightening device is installed, wherein the lace comprises a first strand and a second strand passing through the through hole, the first strand extending in a transverse direction on the upper of the shoe and the second strand extending in a downward inclined direction on the upper of the shoe, and the protective part covering the front circumference of the tightening cap more widely on the second strand side than on the first strand side, so that the protective part is positioned offset toward the second strand side. Effects of the invention

[0018] The cord tightening device according to the present invention includes a protective member that is separated from the housing and coupled to the cord outside the housing, and the protective member includes a lower cord coupling part having a through hole formed therein through which a first strand and a second strand of the cord pass, and a protective part that rises upward from the cord coupling part to the position of the tightening cap and covers the front of the tightening cap, and when the protective member receives the impact force directed toward the tightening cap at the front of the tightening cap, the upper part of the protective member is supported by the tightening cap and the lower part is supported by the base member or the housing, thereby dispersing the impact.

[0019] Accordingly, the present invention prevents external impact force from directly striking the tightening cap or housing and disperses the impact force to prevent damage to the strap tightening device.

[0020] Furthermore, since the protective member of the strap tightening device according to the present invention is separated from the base member and the housing and is coupled to the strap, it can move and tilt at an appropriate angle when subjected to external impact, thereby reducing the possibility of damage by effectively dispersing the external impact force. A particularly important effect is that, while the shoe is worn, the shoelace holds the protective member in a highly tensed state; therefore, when subjected to sudden external impact force, the highly tensed strap supports the shaking protective member, partially absorbing the impact force, and the tension of the strap mitigates the shock.

[0021] In addition, since the protective member that protects the tightening cap of the lace tightening device from external impact is not installed on the base member but is attached to the lace at a position separated from the housing, the base member attached to the shoe can be freely manufactured in a slim structure according to the structure and arrangement of the shoe, and repair or replacement is easy as there is no need to disassemble or replace the entire lace tightening device even if the protective member is damaged. Brief explanation of the drawing

[0022] FIG. 1 is an exploded perspective view showing the disassembled state of a strap tightening device according to an embodiment of the present invention from the top and bottom surfaces. FIG. 2 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. 3 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. 4 is a cross-sectional view illustrating the configuration of a strap tightening device having a protective member installed thereon, according to an embodiment of the present invention. FIG. 5 is a cross-sectional view illustrating a state in which a protective member is in close contact with and covers the front of a tightening cap in a strap tightening device according to an embodiment of the present invention. FIG. 6 is a perspective view illustrating a state in which a protective member is in close contact with and covers the front of a tightening cap while a lace tightening device according to an embodiment of the present invention is installed on a shoe. FIG. 7 is a perspective view illustrating a state in which a protective member is separated from a tightening cap when the lace is released while the lace tightening device according to an embodiment of the present invention is installed on a shoe. FIG. 8 is a perspective view illustrating a protective member in a strap tightening device according to an embodiment of the present invention. FIG. 9 is a perspective view illustrating a conventional strap tightening device. Specific details for implementing the invention

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0024] With reference to FIGS. 1 to 3, the structure and operation of an embodiment of a strap tightening device in which a protective member may be installed will first be described.

[0025] Regarding the lace tightening device installed on a shoe, since various known structures exist for the housing (10), the tightening cap (30) covering the top thereof, and the internal structure, the embodiment described below is intended only to understand the structure and operation process of the lace tightening device and does not limit the internal structure of the lace tightening device according to the present invention.

[0026] Referring to FIGS. 1 to 3, a lace tightening device according to an embodiment of the present invention comprises a base member (60) fixed to the upper of a shoe, a housing (10) coupled to and fixed to the base member (60), a winding wheel (20) on which a first strand (91) and a second strand (92) of a lace are wound inside the housing (10), a tightening cap (30) that covers the top of the housing (10) and operates the winding wheel (20) to rotate the winding wheel (20) in a direction of winding the lace or to unwind the winding wheel (20), and an access hole (14, 15) installed in the housing (10) through which the first strand (91) and the second strand (92) of a lace enter and exit the housing (10) according to the rotation of the winding wheel (20), thereby performing a tightening operation to wind the lace and a unwinding operation to freely unwind the lace.

[0027] The above base member (60) is fixed to the upper (100) of the shoe by stitching or adhesive so that it does not move from the fixed position of the shoe even by external force.

[0028] The base member (60) is configured such that a seating space for the housing (10) is formed so that the cylindrical housing (10) can be fixed by assembly, and the housing (10) can be pressed downward into the seating space and snap-coupled.

[0029] The above seating space is provided with an annular projection (66) around its circumference, so that the housing (10) fits into the interior of the annular projection (66). Therefore, the annular projection (66) forming the seating space in the base member (60) is exposed to the outside and can become a part that contacts and supports the protective member (70) described later.

[0030] When the housing (10) is snap-coupled to the base member (60), the housing (10) is fixed to the base member (60), and the housing (10) is also fixed without moving on the upper (100) of the shoe, just like the base member (60).

[0031] The base member (60) and the housing (10) may be integrated to form a single structure, but they are manufactured separately and assembled to facilitate easy disassembly of the entire strap tightening device.

[0032] In the present invention, even if the base member (60) and the housing (10) are not assembled but are manufactured and installed as a single integrated part, the part fixed to the upper (100) of the shoe can be called the base member (60) and the upper cylindrical part can be distinguished as the housing (10).

[0033] The above housing (10) is fixed so as to be detachably attached to a base member (60) attached to a shoe for easy disassembly and assembly, and has an access hole (14, 15) for a string to enter and exit installed in the side wall.

[0034] The entrance holes (14, 15) are installed in the form of holes penetrating the perimeter of the housing (10) so that the first strand (91) and the second strand (92) of the string can enter and exit the housing (10) respectively, with the first entrance hole (14) and the second entrance hole (15) separated at a predetermined interval.

[0035] The first entrance (14) and the second entrance (15) do not necessarily need to be formed independently of each other, but it is preferable that they be installed at a predetermined interval.

[0036] By forming a locking projection (12) protruding inwardly at the top of the housing (10), the upward movement and detachment of the tightening cap (30) is prevented.

[0037] The above winding wheel (20) is positioned in the internal space (11) of the housing (10) and rotates, and when rotating, it winds the first strand (91) and the second strand (92) of the string into the winding groove (21) on the outer surface, or rotates in the opposite direction to unwind the string.

[0038] The shoelace tightening the shoelace is a single string overall, but since one end and the other end of the string enter the housing (10) and are respectively fixed to the winding wheel (20), in the present invention, the part of the string on the one end side becomes the first strand (91), and the part of the string on the other end side becomes the second strand (92).

[0039] An annular connecting tooth (23) is formed along the circumference of the center line (18) on the upper part of the winding wheel (20) so that it can be connected to and separated from the tightening tooth (33a) of the tightening cap (30).

[0040] The tightening tooth (33a) is formed in an annular shape along the circumference of the lower surface of the inner plate (33) of the tightening cap (30), and when the tightening cap (30) descends and engages with the connecting tooth (23) of the winding wheel (20), the rotational force of the user turning the tightening cap (30) is also transmitted to the winding wheel (20), allowing the winding wheel (20) to be rotated together in the direction of tightening the string.

[0041] When the tightening cap (30) rises, the tightening tooth (33a) is separated from the connecting tooth (23).

[0042] A rotation control member (40) is installed in the lower part of the through hole (25) of the winding wheel (20) to control the rotation of the winding wheel (20).

[0043] The above rotation control member (40) is coupled to the winding wheel (20) and also coupled to the tightening cap (30), and moves up and down together with the tightening cap (30) within the through hole (25), and during the up and down movement, it is engaged with or separated from the stop tooth (63) located at the bottom of the internal space (11) of the base member (60) to control the rotation of the winding wheel (20).

[0044] 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.

[0045] The tightening cap (30) and the rotation control member (40) can move up and down together by the downward column (39) of the tightening cap (30) 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).

[0046] When the tightening cap (30) is pushed and pulled, the raised portion (39a) formed on the downward column (39) of the tightening cap (30) comes into contact with the elastic positioning portion (28) of the winding wheel (20) and moves up and down, thereby setting the tightening cap (30) to an upward and downward position through the action of the elastically deformed positioning portion (28).

[0047] The positioning part (28) is formed in a state of upward protrusion around the upper circumference of the through hole (25) and is a part that opens or closes due to the elasticity of the material as the raised part (39a) moves up and down.

[0048] The tightening cap (30) is a part that covers the top of the housing (10) and operates the winding wheel (20) to rotate the winding wheel (20) in the direction of winding the string or to unwind the string. The user can rotate the tightening cap (30) to wind the string by holding the outer surface of the tightening cap (30) with their finger, or operate the tightening cap (30) to separate the tightening tooth (33a) and the connecting tooth (23) so that the string is freely unwound from the winding wheel (20).

[0049] The above clamping cap (30) and rotation control member (40) have a coupling structure in which an upward projection (48) and a downward column (39) are engaged with each other, and are constrained to each other in the vertical direction so as to move up and down together, but allow relative rotation in the rotational direction.

[0050] When 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 being caught by the rotation control member (40).

[0051] 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.

[0052] 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.

[0053] 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.

[0054] Accordingly, when the rotation control member (40) descends and stops by being caught on the stop tooth (63) of the housing (10), 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.

[0055] 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 relative to the rotation control member (40), 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.

[0056] 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.

[0057] Meanwhile, in an embodiment of the present invention, a protective member (70) is installed on the outside of the base member (60) and the housing (10), separated from the base member (60) and the housing (10) and coupled with a string.

[0058] Referring to FIGS. 4 and 5, the protective member (70) protects the strap tightening device from external impact force, primarily protecting the tightening cap (30) to block the transmission of direct impact force and disperse the impact force.

[0059] The protective member (70) includes a lower string connection part (71) having a passage hole (72, 73) through which the first strand (91) and the second strand (92) of the string pass as shown in FIG. 8, and a protective part (75) that rises upward from the string connection part (71) to the position of the tightening cap (30) and covers the front of the tightening cap (30).

[0060] The above-mentioned string connecting part (71) forms the substantial body of the protective member (70) and is connected to the string and moves along the string.

[0061] The strap connecting portion (71) forms an arc shape curved at a predetermined angle along the circumference of the housing (10) or base member (60), and when the protective member (70) receives an impact force toward the housing (10) or base member (60), the strap connecting portion (71) strikes the side of the base member (60) and is supported.

[0062] Since the housing (10) is combined with the base member (60) and fixed to the base member (60), when the protective member (70) receives an impact force toward the housing (10) or the base member (60), the strap connecting part (71) may be supported by striking the side of the housing (10) depending on the shape of the housing (10) and the base member (60) and their combined structure, and even in that case, there is no significant difference in the effect of striking the base member (60).

[0063] That is, since the base member (60) and the housing (10) are combined and fixed together, when the protective member (70) receives an external impact, there is no significant difference even if the strap connecting part (71) hits and is supported by either the base member (60) or the housing (10).

[0064] The passage holes (72, 73) of the string connection part (71) include a first passage hole (72) and a second passage hole (73) separated at a predetermined interval so that the first strand (91) and the second strand (92) can each pass through, and the first passage hole (72) and the second passage hole (73) are installed as holes larger than the diameter of the string so that the string can slide along.

[0065] Even if the hole sizes of the first through hole (72) and the second through hole (73) are smaller than the diameter of the string, causing the string to be forcibly fitted and resulting in significant friction with the string, the string connecting part (71) slides along the string when the user forcibly moves it. Therefore, the sizes of the first through hole (72) and the second through hole (73) do not necessarily need to be limited, but they are formed as holes larger than the diameter of the string to facilitate assembly of the string and the protective member (70).

[0066] Referring to FIG. 6, the protective part (75) forms an arc shape that wraps around the front circumference of the tightening cap (30), and is in the shape of a plate that covers the tightening cap (30) in an arc shape.

[0067] The protective part (75) substantially blocks the gap between the tightening cap (30) and the base member (60) and the side of the tightening cap (30) in the direction where the impact force is applied, so it rises upward from the strap connecting part (71) to the position of the tightening cap (30) and covers within a predetermined circumference angle range with respect to the direction where the impact force is mainly applied.

[0068] Referring to FIG. 8, the length of the protective portion (75) extending along the circumference, that is, the area (α) covered by the protective portion (75) along the circumference of the tightening cap (30), can be appropriately selected within an angle range of 45° to 120° along the circumference of the tightening cap (30). More preferably, it is suitable to be selected within an angle range of 60° to 90°.

[0069] In addition, the height (h) of the protective part (75) that rises is preferably a height that covers more than the height (h0) of the middle part of the tightening cap (30) based on the lowered state of the tightening cap (30) as shown in FIG. 5.

[0070] Referring to FIGS. 6 and 7, in the case of a lace tightening device attached to the side of the upper (100) of a shoe, when a worker wearing the shoe is working, the direction in which the impact force is mainly applied to the lace tightening device is from the center of the shoe where the tongue is located toward the tightening cap (30) or from the front of the shoe toward the tightening cap (30), and if such impact force is strong, it causes the tightening cap (30) to break or fall off.

[0071] The aforementioned protective part (75) can be installed in a wide angle range along the circumference of the tightening cap (30) to block such impact force, but since the area where the user holds and rotates the tightening cap (30) with their fingers must be secured, the coverage range needs to be appropriately adjusted so as to effectively cover the direction in which the impact force is mainly transmitted without interfering with the user's action of holding and rotating the tightening cap (30).

[0072] For this reason, the angle range (α) of the area covered by the protective part (75) is an angle range appropriately selected within an angle range of 45° to 120° along the circumference of the tightening cap (30), more preferably within an angle range of 60° to 90°, and the protective part (75) is installed in a position on the second strand (92) among the first strand (91) and the second strand (92).

[0073] That is, in a conventional configuration as shown in FIG. 6, where the first strand (91) of the strap extends laterally on the upper (100) of the shoe and the second strand (92) extends downwardly on the upper (100) of the shoe, the protective part (75) covers the front circumference of the tightening cap (30) more widely on the second strand (92) side than on the first strand (91) side, thereby causing the protective part (75) to be positioned so that it is shifted overall toward the second strand (92) side.

[0074] This is a position and coverage range set so that the area covered by the protective part (75) is reduced so as not to interfere with the user’s action of gripping and turning the tightening cap (30), while also enabling effective blocking in the direction in which the impact force is transmitted.

[0075] Meanwhile, the protective part (75) of the present embodiment is provided with a configuration that facilitates convenience when the user comes into contact with the protective part (75) while holding and rotating the tightening cap (30) with their fingers.

[0076] That is, as shown in FIGS. 6 and FIGS. 8, among the two ends of the protective part (75), when the user's finger grasps and rotates the tightening cap (30), the end that the finger approaches and hits along the direction of rotation of the tightening cap (30) has an inclined ridge (76) formed in a shape that lies inclined in accordance with the direction in which the finger approaches.

[0077] Accordingly, when the user’s finger hits the protective part (75) while gripping and rotating the tightening cap (30), the finger can slide along the inclined ridge part (76) while coming into contact with it, thereby minimizing damage to the user’s sense of use.

[0078] After the user holds the tightening cap (30) of the strap tightening device and rotates it to tighten the strap, if the protective member (70) is separated from the tightening cap (30), work or activity at the site is performed while the protective member (70) is pulled toward the tightening cap (30) and pressed against it as shown in FIG. 6.

[0079] Next, the operation of the protective member (70) is explained when work or activity is performed while wearing a shoe equipped with a strap tightening device according to the present embodiment.

[0080] When a strong external impact force is directed toward the tightening cap (30), such as when colliding with a facility during work or activity, the protective member (70) receives the impact force instead.

[0081] At this time, since the protective member (70) is not fixed by being connected to the first strand (91) and the second strand (92) of the string, it can be tilted or moved.

[0082] Accordingly, the protective member (70) is pressed against the housing (10) by the impact force, and the protective member (70) can assume an appropriate posture while tilting or moving. The upper part of the protective member (70) is struck by the tightening cap (30) and supported by the tightening cap (30) ("A" in FIG. 5), and the lower part is struck by the base member (60) (or the housing (10) depending on the structure or shape) and supported by the base member (60) (or the housing (10)) ("B" in FIG. 5).

[0083] Ultimately, the impact force received by the protective member (70) is transmitted to the tightening cap (30) from the top and to the base member (60) (or housing (10) depending on the structure or shape) from the bottom, so that the impact force is distributed to both sides.

[0084] Compared to the case where the tightening cap (30) receives the impact force directly, the magnitude of the impact force transmitted to the tightening cap (30) can be reduced by half, and since the situation where the tightening cap (30) is struck through the gap between the tightening cap (30) and the base member (60) can be prevented, the situation where the tightening cap (30) falls out of the housing (10) or is damaged can be prevented.

[0085] Meanwhile, as another important functional effect of the present invention, the effect of the protective member (70) mitigating impact force is manifested in a configuration where the protective member (70) is combined with a very tense string.

[0086] That is, when wearing the shoes and engaging in activities, the shoelaces are tightened by the tightening cap (30) and combined with the protective member (70) in a very tense state, so the first strand (91) and the second strand (92) of the tense laces hold and support the protective member (70) from below.

[0087] In that state, when an external impact force is applied to the protective member (70) toward the tightening cap (30), a sudden change in posture and shaking of the protective member (70) occurs, and the sudden change is restrained by the first strand (91) and the second strand (92) of the tensioned string, and the first strand (91) and the second strand (92) of the string partially absorb and cushion the impact force. Explanation of the symbols

[0088] 10; Housing 11; Interior space 12; Stopper 14; First entrance 15; Second entrance 18; Centerline 20; winding wheel 23; connecting teeth 25; through hole 26; first ratchet part 28; Positioning part 30; Tightening cap 33; Inner plate 33a; Fastener 39; Downward column 39a; Elevation 40; rotation control member 43; interlocking tooth 46; 2nd ratchet part 48; upward projection 60; base member 63; stop tooth 66; annular jaw 70; protective member 71; string connection part 72; first through hole 73; 2nd passage 75; protective section 76; Sloping ridge section 91; First strand 92; 2nd strand 100; Upper

Claims

Claim 1 A cord tightening device comprising a base member, a housing coupled to and fixed to the base member, a winding wheel on which a cord is wound inside the housing, a tightening cap which operates to rotate the winding wheel in the direction of winding the cord or to unwind the winding wheel while covering the top of the housing, and an access hole installed in the housing through which the cord enters and exits the inside and outside of the housing according to the rotation of the winding wheel, thereby performing a tightening operation to wind and tension a cord and a loosening operation to freely unwind the cord, wherein the device comprises a protective member that is separated from the base member and the housing outside the base member and the housing, moves independently of the base member and the housing, and is coupled to the cord, wherein the protective member comprises a lower cord coupling part that is supported by the cord when the cord is tensioned while passing through the cord through a passage hole formed therein, and a protective part that rises upward from the cord coupling part to the position of the tightening cap and covers the front of the tightening cap, thereby thereby preventing impact force directed toward the tightening cap A string tightening device characterized in that when the protective member receives the impact at the front of the tightening cap, the upper part of the protective member is supported by the tightening cap and the lower part is supported by the base member or housing to disperse the impact force, and the tensioned string can partially absorb the impact force received by the protective member. Claim 2 A strap tightening device according to claim 1, wherein the protective portion is an arc shape wrapping around the front circumference of the tightening cap, and the angle range (α) of the area covered by the protective portion within the circumference of the tightening cap is an angle range selected from 45° to 120° along the circumference of the tightening cap. Claim 3 A strap tightening device according to claim 1, characterized in that the protective part rises to a height greater than or equal to the height of the middle part of the tightening cap based on the lowered state of the tightening cap. Claim 4 A strap tightening device according to claim 1, characterized in that, among the two ends of the protective part, the end where the user's finger approaches and strikes along the direction of rotation of the tightening cap during the process of the user's finger grasping and rotating the tightening cap has an inclined ridge formed in a shape that lies obliquely in accordance with the direction of approach of the finger. Claim 5 A string tightening device according to any one of claims 1 to 4, wherein the string comprises a first strand and a second strand, and the access hole comprises a first access hole and a second access hole separated by a predetermined interval so that the first strand and the second strand each access the inside and outside of the housing. Claim 6 In claim 5, the string tightening device is characterized in that the above-mentioned passage hole includes a first passage hole and a second passage hole separated at a predetermined interval so that the first strand and the second strand each pass through. Claim 7 A shoe equipped with a lace tightening device according to any one of claims 1 to 4, wherein the lace comprises a first strand and a second strand passing through the through hole, the first strand extending transversely on the upper of the shoe and the second strand extending downwardly inclined on the upper of the shoe, and the protective portion covering the front circumference of the tightening cap more widely on the second strand side than on the first strand side, so that the protective portion is positioned offset toward the second strand side.

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