Helmet buckle

Abstract

The invention relates to a helmet buckle. The helmet buckle according to the present application comprises: a base part (100) for guiding a belt member (400) to slide when the belt member (400) advances or retreats; a locking member (200) rotatably coupled to the base (100) and fastened to the belt member (400); and an operating member (300) rotatably coupled to the base (100) and rotating the locking member (200) such that the locking member (200) is separated from the belt member (400) when the operating member is rotated by at least a predetermined angle with respect to the base (100).

Description

Technical Field

[0001] The present disclosure relates to a helmet buckle. Background Art

[0002] A helmet buckle is used for motorcycle helmets or sports helmets (including ski helmets) and is a device for fastening / detaching a strap equipped in the helmet or adjusting the length. In this case, the helmet buckle is made to firmly fix the strap when fastening the strap and to allow the user to easily operate when fastening / detaching or adjusting the length.

[0003] As disclosed in the patent document of the related document described below, the existing buckle is designed in such a way that when the elastic support portion 114 is pushed, the hook of the male buckle 120 is pressed down, and then the female buckle 110 and the male buckle 120 are released. However, since the buckle can be released by only one operation of pushing the elastic support portion 114, an accident may occur when the buckle is released due to some malfunction while riding a motorcycle or doing sports such as skiing.

[0004] [Related Literature] [Patent Document] (Patent Document 1) KR 10-1629928 B1 Summary of the invention

[0005] Technical issues Aspects of the present disclosure are designed to solve the above-mentioned problems, and therefore, the present disclosure aims to provide a helmet buckle, wherein when an operating part is rotated beyond a predetermined angle, the operating part rotates a locking part to separate the locking part from a belt part.

[0006] Technical Solution According to the helmet buckle of the embodiment of the present disclosure, it includes a base, which is configured to guide the belt part to slide when the belt part moves forward or backward, a locking part, which is rotatably coupled to the base and fastened to the belt part; and an operating part, which is rotatably coupled to the base and is configured to rotate the locking part to separate the locking part from the belt part when the operating part is rotated relative to the base beyond a predetermined angle.

[0007] In addition, in the helmet buckle according to the embodiment of the present disclosure, the locking part has a first engaging portion on the side, and the operating part has a second engaging portion on the side that engages with the first engaging portion, and during the rotation of the operating part relative to the base to the predetermined angle, the first engaging portion and the second engaging portion are spaced apart from each other, and when the operating part is rotated relative to the base beyond the predetermined angle, the first engaging portion engages with the second engaging portion.

[0008] In addition, in the helmet buckle according to the embodiment of the present disclosure, the operating part has a predetermined space on the side, and the second engaging part is formed at the boundary of the predetermined space. During the rotation of the operating part relative to the base to the predetermined angle, the first engaging part moves relative to the operating part in the predetermined space, and when the operating part rotates relative to the base beyond the predetermined angle, the first engaging part engages with the second engaging part.

[0009] Furthermore, in the helmet buckle according to the embodiment of the present disclosure, the predetermined space is formed in a recessed portion recessed at a side of the operating member, and the second engaging portion is formed as a step formed at a boundary of the recessed portion.

[0010] Furthermore, in the helmet buckle according to the embodiment of the present disclosure, the first engaging portion is formed in a plate shape and is disposed in the predetermined space.

[0011] In addition, in the helmet buckle according to the embodiment of the present disclosure, the locking part includes a fastening part, which is rotatably coupled to the base and fastened with the belt part, and a first engaging part, which protrudes in one direction from both sides of the fastening part, and the operating part has a recessed part recessed at both sides, and the second engaging part is formed as a step formed at the boundary of the recessed part.

[0012] In addition, in the helmet buckle according to the embodiment of the present disclosure, during the period when the operating part is rotated to the predetermined angle relative to the base, the first engaging part moves relative to the operating part in the recessed part, and when the operating part is rotated relative to the base beyond the predetermined angle, the first engaging part engages with the second engaging part.

[0013] In addition, in the helmet buckle according to the embodiment of the present disclosure, the locking part is rotatably coupled to the base via a first rotating axis, the operating part is rotatably coupled to the base via a second rotating axis, and the second rotating axis is farther from the first engaging portion and the second engaging portion than the first rotating axis.

[0014] Furthermore, in the helmet buckle according to the embodiment of the present disclosure, before the operating member is rotated relative to the base, the operating member fastens the locking member and the belt member by applying pressure to the locking member.

[0015] In addition, in the helmet buckle according to the embodiment of the present disclosure, the locking part has a first engaging portion on the side, the operating part has a third engaging portion on the side that is combined with the first engaging portion, and before the operating part rotates relative to the base, the first engaging portion engages with the third engaging portion.

[0016] Furthermore, in the helmet buckle according to the embodiment of the present disclosure, the operating member has a predetermined space at a side, and the third engaging portion is formed at a boundary of the predetermined space.

[0017] Furthermore, in the helmet buckle according to the embodiment of the present disclosure, the predetermined space is formed in a recessed portion recessed at a side of the operating member, and the third engaging portion is formed as a step formed at a boundary of the recessed portion.

[0018] Furthermore, in the helmet buckle according to the embodiment of the present disclosure, the first engaging portion is formed in a plate shape and is disposed in the predetermined space.

[0019] In addition, in the helmet buckle according to the embodiment of the present disclosure, the base includes a bottom portion extending in a plate shape, and a pair of partition walls extending from both sides of the bottom portion toward each other, so that the locking part can be rotatably coupled to one part and the operating part can be rotatably coupled to another part.

[0020] Furthermore, in the helmet buckle according to the embodiment of the present disclosure, the operating member is anodized aluminum.

[0021] Furthermore, in the helmet buckle according to the embodiment of the present disclosure, the base portion extends in a curved shape.

[0022] In addition, the helmet buckle according to the embodiment of the present disclosure also includes an elastic device for providing elastic force to the operating component in a direction toward the belt component.

[0023] In addition, in the helmet buckle according to the embodiment of the present disclosure, the elastic device is a torsion spring, one end of which is coupled to the operating part, and the opposite end of the torsion spring is supported on a first rotating shaft that rotatably couples the locking part to the base.

[0024] Features and advantages of the present disclosure will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0025] Prior to the description, it should be understood that the terms or words used in the specification and the appended claims should not be interpreted as being limited to the general meaning and dictionary meaning, but should be interpreted according to the meaning and concept corresponding to the technical spirit of the present disclosure based on the principle of allowing the inventor to appropriately define the terms for the best interpretation.

[0026] Beneficial Effects According to the present disclosure, when the operating member is rotated beyond a predetermined angle, the operating member rotates the locking member to separate the locking member from the belt member, thereby preventing the locking member from being released from the belt member due to a malfunction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a perspective view of a helmet buckle according to an embodiment of the present disclosure.

[0028] Figure 2 Detailed description of the invention Figure 2 is an exploded perspective view of a helmet buckle according to an embodiment of the present invention.

[0029] Figures 3 to 6 2 is a cross-sectional view showing the operation process of the helmet buckle according to an embodiment of the present disclosure.

[0030] 7A to 7C are top views illustrating an initial fastening process of a helmet buckle according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] The purposes, specific advantages and novel features of the present disclosure will become apparent through the following detailed description and exemplary embodiments in conjunction with the accompanying drawings. When adding reference numerals to the elements of each of the accompanying drawings in the present disclosure, it should be noted that, although the same elements are depicted in different drawings, they are given the same marks as far as possible. In addition, terms such as "first", "second" or the like are used to distinguish one element from another, and these elements are not limited by the terms. Hereinafter, when describing the present disclosure, if it is determined that a certain description of the related known technology may unnecessarily obscure the subject matter of the present disclosure, its detailed description is omitted.

[0032] Basically, the helmet buckle according to the embodiment of the present disclosure is used for a motorcycle helmet or a sports helmet (including a ski helmet), and is a device for fastening / detaching a strap equipped in the helmet or adjusting the length.

[0033] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0034] Figure 1 is a perspective view of a helmet buckle according to an embodiment of the present disclosure, and Figure 2 2 is an exploded perspective view of a helmet buckle according to an embodiment of the present disclosure.

[0035] like Figure 1 and Figure 2As shown, the helmet buckle according to the embodiment of the present disclosure includes a base (100), a locking component (200) and an operating component (300), wherein the base (100) is used to guide the belt component (400) to slide when the belt component (400) moves forward or backward, the locking component (200) is rotatably coupled to the base (100) and is fastened together with the belt component (400), and the operating component (300) is rotatably coupled to the base (100) and is configured to rotate the locking component (200) to separate the locking component (200) from the belt component (400) when the operating component (300) is rotated relative to the base (100) beyond a predetermined angle.

[0036] When the belt component (400) moves forward or backward, the base (100) plays a role in guiding the belt component (400) to slide, and supports the locking component (200) and the operating component (300). Here, the base (100) may include a bottom portion (110) and a pair of partition walls (120). In this case, the bottom portion (110) can extend in a plate shape corresponding to the belt component (400), and the pair of partition walls (120) can extend from both sides (sides in the length direction) of the bottom portion (110) to each other. The locking component (200) is rotatably coupled to a portion of the partition wall (120) (the side away from the belt component (400)), and the operating component (300) is rotatably coupled to another portion of the partition wall (120) (the side close to the belt component (400)). More specifically, the first rotation axis (220) may be coupled to a portion of the partition wall (120), and the locking member (200) may be rotatably coupled to the base (100) via the first rotation axis (220). In addition, the second rotation axis (340) may be coupled to another portion of the partition wall (120), and the operating member (300) may be rotatably coupled to the base (100) via the second rotation axis (340).

[0037] In addition, the base (100) can be connected to a belt or a belt-like object and mounted on the helmet, and for this purpose, the base (100) can include a connecting portion (130) to which the belt or the belt-like object is connected. Here, the connecting part (130) can extend from the end of the partition wall (120) (the end on the opposite side of the advancing direction of the belt part 400) in a direction away from the operating part (300) (downward direction).

[0038] At the same time, the base (100) (bottom part (110)) can extend in a curved shape having a curvature that conforms to the shape of the wearer's chin, thereby reducing the wearer's discomfort. In addition, since the base (100) directly contacts the wearer, for example, the base (100) can be made of SS316 stainless steel that is harmless to the human body, but is not necessarily limited thereto.

[0039] When the locking member (200) is fastened to the belt member (400), the locking member (200) plays a role in fixing the belt member (400). As mentioned above, the locking member (200) can be rotatably coupled to the base (100) through the first rotation axis (220). Here, since the locking member (200) is disposed at a predetermined distance from the bottom portion (110) of the base (100) (see Figure 3 ), so that the belt member (400) can move forward or backward through the space between the bottom portion (110) of the base (100) and the locking member (200). Figure 2 As shown, the locking component (200) may have a first engaging portion (210) on one side. Specifically, the locking component (200) may include a fastening portion (205) and a first engaging portion (210). Here, the fastening portion (205) may be fastened together with the belt component (400) and may be rotatably coupled to the base (110) via a first rotating shaft (220). In this case, a second toothed portion (230) may be formed on one surface (lower surface) of the fastening portion (205), and the second toothed portion (230) may be coupled to the first toothed portion (410) formed in the belt component (400), so that the fastening portion (205) may be fastened to the belt component (400). In addition, the first engaging portion (210) protrudes from both sides of the operating member (300) in one direction (a direction away from the first rotation axis (220), or a direction in which the belt member (400) advances), and when the first engaging portion (210) is engaged with the second engaging portion (310) or with the third engaging portion (320) of the operating member (300), the first engaging portion (210) plays a role of controlling the fastening portion (205). For example, the first engaging portion (210) may be formed in a plate shape and disposed in recessed portions (335) formed on both sides of the operating member (300). Here, when the first engaging portion (210) engages with the third engaging portion (320) of the operating member (300), the locking member (200) can be fastened to the belt member (400), or when the first engaging portion (210) engages with the second engaging portion (310) of the operating member (300) by rotation of the operating member (300), the fastening portion (205) can be separated from the belt member (400), and the relevant description will be described in detail below.

[0040] The operating component (300) plays a role in rotating the locking component (200) to separate the locking component (200) from the belt component (400). As mentioned above, the operating component (300) can be rotatably coupled to the base (100) through the second rotation axis (340). Here, when the operating component (300) rotates relative to the base (100) beyond a predetermined angle, the operating component (300) can rotate the locking component (200) to separate the locking component (200) from the belt component (400).

[0041] Invention method Specifically, the operating member (300) may have a second engaging portion (310) on one side that engages with the first engaging portion (210) of the locking member (200). Figure 3 and Figure 4 As shown, during the period when the operating member (300) rotates to a predetermined angle relative to the base (100), the first engaging portion (210) of the locking member (200) and the second engaging portion (310) of the operating member (300) are spaced apart from each other. Accordingly, when the operating member (300) rotates to a predetermined angle relative to the base (100), the locking member (200) does not rotate. However, as Figure 5 and Figure 6 As shown, when the operating component (300) rotates relative to the base (100) beyond a predetermined angle, the first engaging portion (210) of the locking component (200) engages with the second engaging portion (310) of the operating component (300). Accordingly, when the operating component (300) rotates relative to the base (100) beyond a predetermined angle, the locking component (200) can rotate together with the operating component (300) and separate from the belt component (400). Finally, only when the operating component (300) rotates relative to the base (100) beyond a predetermined angle can the operating component (300) rotate the locking component (200) to separate the locking component (200) from the belt component (400), thereby preventing the locking component (200) from being loosened from the belt component (400) due to a malfunction.

[0042] More specifically, if Figure 2As shown, the operating component (300) may have a predetermined space (330) on one side, and the second engaging portion (310) may be formed at the boundary of the predetermined space (330). For example, the predetermined space (330) of the operating component (300) may be formed in a recessed portion (335) formed at the side (both sides) of the operating component (300), and the second engaging portion (310) of the operating component (300) may be formed as a step (337) formed at the boundary of the recessed portion (335). In addition, the first engaging portion (210) may be formed in a plate shape and disposed in the predetermined space (330) (recessed portion (335)) of the operating component (300). Accordingly, during the period when the operating component (300) is rotated to a predetermined angle relative to the base (100) (see Figure 3 and Figure 4 ), the first engaging portion (210) moves relative to the operating member (300) within the predetermined space (330) (recessed portion (335)), and the locking member (200) does not rotate. However, when the operating member (300) rotates relative to the base (100) beyond a predetermined angle (see Figure 5 and Figure 6 ), the first engaging portion (210) of the locking member (200) engages with the second engaging portion (310) of the operating member (300) (a step (337) formed at a boundary of the recessed portion (335)), and the locking member (200) can rotate together with the operating member (300) and separate from the belt member (400). At the same time, the predetermined angle by which the operating member (300) is rotated (a malfunction prevention range in which the locking member (200) is not rotated) is not limited to a specific range, but may be, for example, 10° to 30°, and after the predetermined angle, the maximum angle by which the operating member (300) is rotated (an operating range in which the locking member (200) is rotated) is not limited to a specific range, but may be, for example, 35° to 50°.

[0043] At the same time, the locking component (200) is rotatably coupled to the base (100) via the first rotation axis (220), and the operating component (300) is rotatably coupled to the base (100) via the second rotation axis (340), wherein the second rotation axis (340) is further away from the first engagement portion (210) and the second engagement portion (310) (engagement area) than the first rotation axis (220). Accordingly, since the distance from the second rotation axis (340) of the operating component (300) to the engagement area is greater than the distance from the first rotation axis (220) of the locking component (200) to the engagement area, the rotation amount of the operating component (300) is greater than the rotation amount of the locking component (200). As described above, since the rotation amount of the operating component (300) is greater than the rotation amount of the locking component (200), the possibility of the locking component (200) malfunctioning during the operation of the operating component (300) by the wearer can be reduced.

[0044] In addition, if Figure 3 As shown, the operating component (300) can play a role in fastening the locking component (200) to the belt component (400) by applying pressure to the locking component (200). Before the operating component (300) rotates relative to the base (100), the operating component (300) can apply pressure to the locking component (200) through the elastic force of the elastic device (500), so that the locking component (200) abuts against the belt component (400). When the locking component (200) is subjected to the pressure of the operating component (300), the first toothed portion (410) of the belt component (400) and the second toothed portion (230) of the locking component (200) can be coupled to each other, and the locking component (200) can be fastened to the belt component (400).

[0045] Specifically, the operating member (300) may have a third engaging portion (320) on one side, and the third engaging portion (310) engages with the first engaging portion (210) of the locking member (200). Here, before the operating member (300) rotates relative to the base (100), the first engaging portion (210) may engage with the third engaging portion (320). Accordingly, before the operating member (300) rotates relative to the base (100), the operating member (300) may fasten the locking member (200) to the belt member (400) by applying pressure to the locking member (200).

[0046] More specifically, if Figure 2As shown, the operating component (300) may have a predetermined space (330) on one side, and the third engaging portion (320) may be formed at the boundary of the predetermined space (330). For example, the predetermined space (330) of the operating component (300) may be formed in a recessed portion (335) formed at the side (both sides) of the operating component (300), and the third engaging portion (320) of the operating component (300) may be formed as a step (337) formed at the boundary of the recessed portion (335). In addition, the first engaging portion (210) is formed in a plate shape and may be positioned in the predetermined space (330) (recessed portion (335)) of the operating component (300). Accordingly, before the operating component (300) is rotated relative to the base (100) (see Figure 3 ), the first engaging portion (210) of the locking component (200) can engage with the third engaging portion (320) of the operating component (300) (a step (337) formed at the boundary of the recessed portion (335)), and the operating component (300) can fasten the locking component (200) to the belt component (400) by applying pressure to the locking component (200).

[0047] At the same time, if Figure 2 As shown, the second engaging portion (310) and the third engaging portion (320) can be formed by a recessed portion (335) formed at the side (both sides) of the operating member (300). For example, the second engaging portion (310) can be formed as a step (337) formed at the lower boundary of the recessed portion (335) formed in the operating member (300), and the third engaging portion (320) can be formed as a step (337) formed at the upper boundary of the recessed portion (335) formed in the operating member (300). In this case, the first engaging portion (210) of the locking member (200) can be disposed in a predetermined space (330) between the second engaging portion (310) and the third engaging portion (320). Accordingly, before the operating member (300) is rotated relative to the base (100) (see Figure 3 ), the top of the first engaging portion (210) of the locking member (200) can engage with the third engaging portion (320) of the operating member (300), and when the operating member (300) is rotated relative to the base (100) beyond a predetermined angle (see Figure 5 and Figure 6 ), the bottom of the first bonding portion (210) can be bonded to the second bonding portion (310).

[0048] Meanwhile, the operating member (300) may be made of anodized aluminum, but is not limited thereto. In this case, the operating member (300) may have a specific color (eg, red) through an anodizing process.

[0049] In addition, the helmet buckle may include an elastic device (500) for providing an elastic force to the operating part (300) in a direction toward the band part (400). For example, the elastic device (500) may be a torsion spring, in which case the cylindrical body of the torsion spring (500) may be inserted into the second rotation axis (340) that rotatably couples the operating part (300) to the base (100). In addition, one end of the torsion spring (500) may be coupled to the insertion groove (350) of the operating part (300), and the other end of the torsion spring (500) may be supported on the first rotation axis (220) that rotatably couples the locking part (200) to the base (100). Accordingly, since the other end of the torsion spring (500) is supported on the first rotation axis (220), a rotation force (elastic force) around the second rotation axis (340) may be provided to the operating part (300) through one end.

[0050] Furthermore, a traction device (600) may be provided at the end of the operating member (300) to allow the wearer to easily operate the operating member (300) (see Figure 1 ). Accordingly, by pulling the traction device (600), the wearer can easily rotate the operating member (300) relative to the base (100).

[0051] Meanwhile, FIGS. 7A to 7C are top views showing the initial fastening process of a helmet buckle according to an embodiment of the present disclosure. As shown in FIGS. 7A to 7C, when the belt member (400) moves into the base (100), the width of the first recessed area (413) where the teeth of the first toothed portion (410) of the belt member (400) first meet the teeth of the second toothed portion (230) of the locking member (200) is smaller than the width of the first protruding area (233) where the teeth of the second toothed portion (230) first meet the teeth of the first toothed portion (410) of the locking member (200) when the belt member (400) moves into the base (100) (W1 < W2). In addition, the width of the first recessed area (413) is equal to or greater than the width of the second protruding area (235) where the teeth of the second toothed portion (230) second meet the teeth of the first toothed portion (410) when the belt member (400) moves into the base (100) (W1 = W3) or (W1 > W3). That is, the width of the first recessed area (413) provided at the foremost position of the first toothed portion (410) is narrower than the width of the first protruding area (233) provided at the foremost position of the second toothed portion (230) (W1 < W2), and the width of the first recessed area (413) is equal to or greater than the width of the second protruding area (235) provided next to the first protruding area (233) (W1 = W3) or (W1 > W3). With this configuration, the first protruding area (233) is not fastened to the first recessed area (413) (see FIG. 7B), and the second protruding area (235) is fastened to the first recessed area (413). Accordingly, the belt member (400) and the locking member (200) can be fastened by at least two recessed areas and at least two protruding areas (see FIG. 7C), rather than by one recessed area and one protruding area (see FIG. 7B), to achieve a firm fastening between the belt member (400) and the locking member (200). In this case, various designs can be utilized such that the width of the first recessed area (413) is smaller than the width of the first protruding area (233) (W1 < W2) and equal to or greater than the width of the second protruding area (235) (W1 = W3) or (W1 > W3). For example, in order to limit the width of the first recessed area (413), protruding portions (413a) can protrude from both ends of the first recessed area (413) in the width direction. However, this is presented for illustrative purposes, and the scope of protection of the present disclosure is not limited thereto.

[0052] Although the present disclosure has been described in detail above through specific embodiments, this is for the purpose of describing the present disclosure in detail. The present disclosure is not limited thereto, and it is obvious that modifications or changes can be made by those with ordinary skill in the art within the technical spirit of the present disclosure.

[0053] These modifications and changes to the present disclosure belong to the scope of the present disclosure, and the protection scope of the present disclosure will be apparent from the appended claims.

[0054] [Detailed description of main components] 100: base 110: bottom part 120: partition wall 130: connecting member 200: Locking part 205: Fastening part 210: First engagement portion 220: First rotation axis 230: Second toothed portion 233: First protruding area 235: Second protruding area 300: Operating part 310: Second joint portion 320: Third joint portion 330: Predetermined space 335: Recessed portion 337: Step 340: Second rotation axis 350: Insertion slot 400: Belt component 410: first toothed portion 413: first recessed area 413a: protruding part 500: elastic device 600: Traction device.

[0055] Industrial Applicability One aspect of the present disclosure is to solve the above-mentioned problem, and therefore, the present disclosure provides a helmet buckle, wherein when an operating part is rotated beyond a predetermined angle, the operating part rotates a locking part to separate the locking part from a belt part.

Claims

1. A helmet buckle, comprising: a base portion configured to guide the belt member to slide when the belt member moves forward or backward; a locking member rotatably coupled to the base and fastened with the belt member; and An operating member is rotatably coupled to the base and is configured to rotate the locking member to separate the locking member from the belt member when the operating member is rotated relative to the base more than a predetermined angle.

2. The helmet buckle according to claim 1, wherein the locking member has a first engaging portion at a side edge, The operating member has a second engaging portion on the side thereof which engages with the first engaging portion. wherein the first engaging portion and the second engaging portion are spaced apart from each other during rotation of the operating member relative to the base to the predetermined angle, and When the operating member is rotated relative to the base portion beyond the predetermined angle, the first engaging portion engages with the second engaging portion.

3. The helmet buckle according to claim 2, wherein the operating component has a predetermined space on the side. wherein the second engaging portion is formed at a boundary of the predetermined space, wherein the first engaging portion moves relative to the operating member in the predetermined space during rotation of the operating member relative to the base to the predetermined angle, and When the operating member is rotated relative to the base portion beyond the predetermined angle, the first engaging portion engages with the second engaging portion.

4. The helmet buckle according to claim 3, wherein the predetermined space is formed in a recessed portion recessed at a side edge of the operating member, and The second engaging portion is formed as a step formed at a boundary of the recessed portion. 5 . The helmet buckle according to claim 3 , wherein the first engaging portion is formed in a plate shape and is disposed in the predetermined space.

6. The helmet buckle according to claim 1, wherein the locking component comprises: a fastening portion rotatably coupled to the base portion and fastened with the belt member; and a first engaging portion protruding in one direction from both sides of the fastening portion, and The operating member has a recessed portion recessed at both sides, and the second engaging portion is formed as a step formed at a boundary of the recessed portion.

7. The helmet buckle according to claim 6, wherein during the rotation of the operating member relative to the base to the predetermined angle, the first engaging portion moves relative to the operating member in the recessed portion, and When the operating member is rotated relative to the base portion beyond the predetermined angle, the first engaging portion engages with the second engaging portion.

8. The helmet buckle according to claim 2, wherein the locking member is rotatably coupled to the base via a first rotation axis, wherein the operating member is rotatably coupled to the base via a second rotation axis, and The second rotation axis is farther from the first engaging portion and the second engaging portion than the first rotation axis.

9. The helmet buckle according to claim 1, wherein the operating member fastens the locking member with the strap member by applying pressure to the locking member before the operating member is rotated relative to the base.

10. The helmet buckle according to claim 9, wherein the locking member has a first engaging portion at a side edge, The operating member has a third engaging portion on the side thereof to be engaged with the first engaging portion, and Before the operating member rotates relative to the base, the first engaging portion engages with the third engaging portion.

11. The helmet buckle according to claim 10, wherein the operating part has a predetermined space on the side, and wherein the third engaging portion is formed at a boundary of the predetermined space.

12. The helmet buckle according to claim 11, wherein the predetermined space is formed in a recessed portion recessed at a side edge of the operating member, and wherein the third engaging portion is formed as a step formed at a boundary of the recessed portion.

13. The helmet buckle according to claim 11, wherein the first engaging portion is formed in a plate shape and is disposed in the predetermined space.

14. The helmet buckle of claim 1, wherein the base comprises: a bottom portion extending in a plate-like manner; and A pair of partition walls extend from both sides of the bottom portion toward each other so that the locking member is rotatably coupled to one portion and the operating member is rotatably coupled to the other portion.

15. The helmet buckle according to claim 1, further comprising: The elastic device is used for providing elastic force to the operating member in a direction toward the belt member.

16. The helmet buckle according to claim 15, wherein the elastic device is a torsion spring, and One end of the torsion spring is coupled to the operating member, and an opposite end of the torsion spring is supported on a first rotation shaft that rotatably couples the locking member to the base.

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