JP2006336168A - Helmet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a helmet having a simple mounting mechanism of a shield, strongly fixing without slackening the shield even in the case of moving the shield forward or backward. <P>SOLUTION: This helmet is provided by having a cap body 10, a visor 20 fixed at the outside of the cap body 10, and arranging a shield 30 between the cap body 10 and visor 20 as capable of moving forward and backward, installing a supporting shaft 13 projecting towards the outside of the cap body 10 and holding the shield 30 as rotatable at the cap body 10, and at the supporting shaft 13, mounting a joining member 40 having an engaging part 46 capable of engaging with an engaging part 22 installed at the inside surface of the visor, as non-rotatable. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a helmet having a substantially hemispherical cap body and a visor disposed outside the cap body, and a shield that can be advanced and retracted between the cap body and the visor.

  Examples of the helmet configured as described above include motorcycle helmets and security helmets. These helmets are used with the shield retracted or advanced depending on the situation.For example, security helmets are usually worn with the shield retracted to improve visibility. In the case of security, it is used to protect the face and the like by wearing the shield in the advanced state.

As helmets having a visor and a shield in this manner, for example, those disclosed in Patent Document 1 and Patent Document 2 are provided.
The helmets disclosed in Patent Literature 1 and Patent Literature 2 are provided with attachment holes in the visor and the shield, respectively, and screw members are inserted into the attachment holes from the outside of the visor and screwed into the cap body. Is attached to the cap body.

In the helmet having this configuration, the shield can be advanced and retracted by rotating the shield around the screw member as the rotation axis. Moreover, in the helmet disclosed in Patent Document 2, the visor and the shield are attached to the cap body with one screw member, so the number of parts is small and the configuration of the helmet is simple.
JP-A-63-288207 Japanese Patent Laid-Open No. 04-146205

By the way, in the helmet described above, the screw member that attaches the visor and the shield to the cap body is exposed to the outside of the visor. Therefore, when the impact from the outside of the helmet is directly applied to the screw member, the screw member is loosened. There was a risk of it. When the screw member is loosened, there is a problem that the shield is not fixed sufficiently and the shield is loosened or detached due to an impact. Further, when the shield is used with the shield retracted, the shield may fall unexpectedly.
Further, when an external cover or a loosening prevention member is used for the screw member to prevent the screw member from loosening, there is a problem in that the number of parts increases, the helmet has a complicated configuration, and the manufacturing cost of the helmet increases. .

  The present invention has been made in view of such circumstances, and the shield mounting mechanism has a simple configuration, and the shield is firmly fixed without being loosened even when the shield is advanced or retracted. The purpose is to provide a helmet.

  A helmet according to the present invention is a helmet having a cap body and a visor fixed to the outside of the cap body, and a shield that can be advanced and retracted is disposed between the cap body and the visor. The body is provided with a support shaft that protrudes toward the outside of the cap body and rotatably holds the shield, and the support shaft is engaged with an engaging portion provided on the inner surface of the visor so as not to rotate. A connecting member having a lockable portion is attached.

In the helmet according to the present invention, a support shaft that protrudes outward is formed on the cap body, and the shield can be rotatably held by this support shaft. Therefore, when the shield is advanced and retracted, the shield is used with the support shaft as the rotation shaft. It is possible to rotate, the rotational movement of the shield is prevented from being transmitted to the connecting member, and the looseness of the shield can be suppressed.
In addition, since the engaging member is provided with the engaging portion and the engaging portion that can be engaged with the engaging portion is provided on the inner surface of the visor, the connecting member is disposed inside the visor. No impact is directly transmitted to the connecting member, and there is no possibility that the connecting member is loosened by the impact. Moreover, since the latching | locking part and the engaging part are engaged so that rotation is impossible, it can prevent reliably that a connection member rotates, and can prevent the looseness of a shield reliably.
Moreover, since it is not necessary to separately provide an external cover and a loosening prevention member in a connection member, a connection member can be made into a simple structure and this helmet can be manufactured at low cost.

  In the helmet according to the embodiment of the present invention, a through hole that penetrates from the inside to the outside of the cap body is formed in the support shaft, and a shaft portion that is fitted into the through hole is provided in the connection member. And an outer member connected to one end side of the shaft portion and disposed outside the shield, and an inner member connected to the other end side of the shaft portion and disposed inside the cap body, A fitting portion that extends at least in the axial direction is provided on the outer peripheral surface of the shaft portion, and a fitted portion that can be fitted to the fitting portion is formed on the inner peripheral surface of the through hole. .

In the helmet having this configuration, a shaft portion is fitted into a through hole provided in the support shaft, an outer member disposed outside the shield is provided on one end side of the shaft portion, and a cap is provided on the other end side of the shaft portion. Since the inner member disposed inside the body is provided, the shield and the cap body can be sandwiched between the inner member and the outer member.
Further, a fitting portion that extends at least in the axial direction, that is, extends in a direction other than the circumferential direction is provided on the outer peripheral surface of the shaft portion, and can be fitted to the fitting portion on the inner peripheral surface of the through hole provided in the support shaft. Since the to-be-fitted part is formed, it can prevent reliably that a connection member rotates by fitting with a fitting part and a to-be-fitted part. Therefore, even when the rotational movement of the shield is transmitted to the connecting member, the connecting member does not rotate, and the shield can be more reliably prevented from loosening.

  The cap body and the shield have a restriction mechanism for restricting an advance / retreat range due to rotation of the shield, a retracted position in which the shield is accommodated between the cap body and the visor, and an advanced position that protrudes from the cap body By providing a fixing mechanism for selectively fixing the shield, it is possible to prevent the shield from unexpectedly falling when used in a state where the shield is retracted. Similarly, even when the shield is used in the advanced state, the shield can be prevented from wobbling. Moreover, since the advancing / retreating range of the shield is regulated, the shield can be prevented from falling.

Further, the outer member is provided with the shaft portion having a cylindrical shape and a female screw portion formed on the inner peripheral surface, a pressing portion for pressing the shield, and the locking portion having a polygonal flat plate shape. By forming a male screw portion to be screwed to the female screw portion on the inner member, the cap body and the shield are firmly held by screwing the male screw portion of the inner member into the female screw portion of the outer member. be able to. Further, since the outer member is provided with a locking portion having a polygonal flat plate shape, it is possible to prevent the outer member from rotating due to the engagement between the locking portion and the engaging portion on the inner surface of the visor. Looseness can be reliably prevented.

Hereinafter, a helmet according to an embodiment of the present invention will be described with reference to the accompanying drawings. 1 to 6 show a helmet which is an embodiment of the present invention. This helmet is used, for example, for security purposes, and can protect the eye part with the shield advanced.
The helmet includes a cap body 10 formed in a substantially hemispherical shape, a visor 20 disposed so as to protrude forward from the cap body 10, and a shield disposed between the cap body 10 and the visor 20 so as to be able to advance and retract. 30 and a screw member 40 for attaching the visor 20 and the shield 30 to the cap body 10.

As shown in FIG. 7, the cap body 10 has a substantially hemispherical dome shape with the rear side (right side in FIG. 7) projecting downward. For example, an ABS resin (acrylonitrile butadiene styrene copolymer) is used. It is molded by injection molding.
A plurality of mounting recesses 11 for mounting the hammock H arranged inside the cap body 10 are formed in the inner part of the dome shape formed by the cap body 10, and in this embodiment, as shown in FIG. Four places are formed.
Further, as shown in FIG. 7, a plurality of latching recesses 12 for latching the visor 20 are formed from the front side to the side surface of the cap body 10, and in this embodiment, a total of five locations are formed. .

  A support shaft 13 that protrudes toward the outside of the cap body 10 is provided on the front side of the side surface of the cap body 10. The support shaft 13 is disposed on the front side of the center of the hemisphere formed by the cap body 10 and is formed to extend outward in the radial direction of the cap body 10. A through-hole penetrating from the inner side to the outer side of the cap body 10 is formed in the support shaft 13, and a protruding portion that protrudes inward and extends along the direction in which the through-hole extends is formed on the inner peripheral surface of the through-hole. 14 is formed, and in this embodiment, three ridges 14 are arranged at equal intervals of 120 ° in the circumferential direction. The outer peripheral surface of the support shaft 13 is a smooth circumferential surface.

A cylindrical guide pin 15 is provided on the front side of the support shaft 13 (left side in FIG. 7) so as to protrude to the outside of the cap body 10, and the cap body of the guide pin 15 as shown in FIG. The protrusion height from the outer surface 10 is formed to be larger than the protrusion height of the support shaft 13.
In addition, two protrusions 16 protruding in a convex curved shape toward the outside of the cap body 10 are provided in parallel on the upper side of the support shaft 13, and the protrusion 16 positioned on the front side is the first protrusion. The protrusion 16 located on the rear side is the second protrusion 16B, and the first protrusion 16A and the second protrusion 16B are also centered on the center of the circle formed by the outer peripheral surface of the support shaft 13. It is arranged on the circumference.
Further, the support shaft 13, the guide pin 15, and the protrusion 16 are provided on the left side surface and the right side surface of the cap body 10, and are arranged symmetrically.

The visor 20 disposed on the front side of the cap body 10 is made of, for example, polycarbonate and is semi-transparent, and is convex toward the front side (right side in FIG. 8) and the upper side as shown in FIG. It is formed in a convex curved plate shape. More specifically, the central portion of the visor 20 protrudes greatly toward the front side, and is inclined so as to gradually move downward as it goes toward the front side. The shape is such that the height gradually decreases toward the side.
Here, the rear end surface 21 that contacts the cap body 10 of the visor 20 is formed in a curved shape matching the outer surface of the cap body 10.

  As shown in FIG. 8, engagement concave portions 22 are formed on the inner surfaces of both end faces of the visor 20 by removing two sides positioned downward with one vertex of the regular hexagon facing upward. 22 has a side surface 22A facing the inner surface of the visor 20.

A plurality of ribs 23 (three in this embodiment as shown in FIG. 8) extending in the engagement direction are formed on the inner surface of the visor 20 of the engagement recess 22, and the rib surface of the rib 23 is formed on the side surface 22A. The height of the rib 23 from the inner surface of the visor 20 is adjusted so as to be parallel to the surface. In the present embodiment, since the visor 20 is shaped so as to gradually expand as it goes downward, the height of the rib 23 from the inner surface of the visor 20 increases at the lower side of the visor 20 and increases toward the upper side. It is formed so as to gradually become lower.
The rear end surface 21 of the visor 20 is formed with a plurality of claw portions 24 that are hooked on the hook recess 12 of the cap body 10.

  The shield 30 disposed between the cap body 10 and the visor 20 is made of, for example, polycarbonate and is formed transparent, and a shield body 31 is formed in a convex curved plate shape that is convex toward the front side. The shield body 31 has attachment portions 32 provided at both ends. Here, the convex curved surface formed by the shield 30 has a shape that matches the curvature of the curved surface of the portion that contacts the outer surface of the cap body 10 when the shield 30 is advanced.

The attachment portion 32 is formed with attachment holes 33 each having an inner peripheral surface substantially the same diameter as the outer peripheral surface of the support shaft 13 provided in the cap body 10. A guide groove 34 on which the guide pin 15 provided on the cap body 10 is slidable is formed on the front side of the mounting hole 33, and the guide groove 34 is also centered on the center of the mounting hole 33. It is formed to extend in a circular arc shape.
Further, two lock holes 35 into which the protrusions 16 provided on the cap body 10 can be fitted are formed in parallel above the attachment hole 33, and the lock hole 35 located on the front side is the first lock. The lock hole 35 located on the rear side is a second lock hole 35B. The first lock hole 35 </ b> A and the second lock hole 35 </ b> B are arranged on a circumference with the center of the mounting hole 33 as the center.

The screw member 40 that attaches the shield 30 to the cap body 10 includes an outer member 41 that is positioned outside the shield 30 and an inner member 47 that is disposed inside the cap body 10.
The outer member 41 is formed in a multi-stage shaft shape as shown in FIGS. 9 and 10, and has a substantially cylindrical shaft portion 42 disposed on the most distal end side (lower side in FIG. 10), and the shaft portion 42. The pressing portion 45 has a one-step large diameter, and a locking portion 46 that is disposed on the rear end side (the upper side in FIG. 10) of the pressing portion 45 and has a larger diameter than the pressing portion 45.

The locking portion 46 is formed in a substantially regular hexagonal flat plate shape and is configured to be engageable with the engaging recess 22 of the visor 20.
Further, the surface of the pressing portion 45 facing the shaft portion 42 is formed into a flat flat surface, and serves as a pressing surface 45A that presses the shield 30 toward the cap body 10 side.
A female screw portion 43 is formed on the inner peripheral surface of the shaft portion 42 having a substantially cylindrical shape, and a plurality of groove portions 44 extending along the direction in which the shaft portion 42 extends is formed on the outer peripheral surface of the shaft portion 42. In this embodiment, three groove portions 44 are arranged at intervals of 120 ° in the circumferential direction.

  As shown in FIGS. 5 and 6, the inner member 47 has a male screw portion 48 on the front end side, and a large diameter portion 49 that is one step larger in diameter than the male screw portion 48 on the rear end side of the male screw portion 48. The surface of the large-diameter portion 49 on the male screw portion 48 side is formed into a flat flat surface, and serves as a pressing surface 49 </ b> A that presses the inner surface of the cap body 10.

The shield 30 and the visor 20 are attached by the screw member 40 as follows, thereby forming a helmet.
First, the inner peripheral surface of the shield 30 is brought into contact with the outer surface of the cap body 10 at a position where the shield 30 is advanced, and the mounting hole 33 of the shield 30 is fitted into the support shaft 13 of the cap body 10. Then, as shown in FIGS. 2 and 4, in the shield 30, the guide pin 15 protruding from the cap body 10 is inserted into the upper end portion of the guide groove 34 of the shield 30, and the second lock hole 35 </ b> B of the shield 30 is formed. It arrange | positions so that it may engage with the 1st projection part 16A of the cap body 10. FIG.

Next, the shaft portion 42 of the outer member 41 is inserted into a through hole formed in the support shaft 13 from the outside of the shield 30. Here, the three groove portions 44 formed on the outer peripheral surface of the shaft portion 42 and the protrusions 14 formed on the inner peripheral surface of the support shaft 13 are fitted, and a regular hexagonal surface formed by the locking portion 46 is formed. It is arranged so that one vertex points upward.
The inner member 47 is inserted from the inner side of the cap body 10, the male screw portion 48 of the inner member 47 is screwed to the female screw portion 43 of the shaft portion 42, and the inner member 47 is screwed, whereby the pressing portion of the outer member 41. 45A, the pressing surface 45A presses the shield 30 toward the cap body 10, and the pressing surface 49A of the large-diameter portion 49 of the inner member 47 presses the cap body 10 toward the shield 30. As shown in FIGS. The pressing surfaces 45A and 49A come close to each other and sandwich the shield 30 and the cap body 10.

  In this state, the visor 20 is attached by engaging the engaging concave portion 22 provided inside the visor 20 with the engaging portion 46 having a regular hexagonal flat plate shape provided on the outer member 41. Here, three ribs 23 are formed in the engaging recess 22 provided inside the visor 20, and between the rib surface of the three ribs 23 and the side surface 22 </ b> A facing the inner surface of the visor 20. The locking part 46 is inserted and the visor 20 is attached.

Further, the visor 20 is fixed to the cap body 10 by the claw portion 24 formed on the rear end surface 21 of the visor 20 being hooked on the hook recess 12 of the cap body 10.
Here, as shown in FIG. 5, the guide pin 15 protruding from the cap body 10 has a height that does not contact the inner surface of the visor 20, and the gap between the guide pin 15 and the inner surface of the visor 20 is the thickness of the shield 30. It is set to be smaller.

The helmet configured in this way is attached with the hammock H attached to the mounting recess 11 provided inside the cap body 10 so that the head is inserted into the hammock H, and the shield 30 is attached. Use it by moving it back and forth according to the situation.
When the shield 30 is retracted, the guide pin 15 provided on the cap body 10 is disposed at the lower end of the guide groove 34 of the shield 30, and when the shield 30 is advanced, the guide pin 15 is guided by the guide groove of the shield 30. 34 is arranged at the upper end of 34. That is, the guide pin 15 and the guide groove 34 constitute a regulation mechanism 51 that regulates the advance / retreat range of the shield 30.

  Here, in the state where the shield 30 is retracted, the first lock hole 35A is engaged with the first protrusion 16A, and the second lock hole 35B is engaged with the second protrusion 16B. 30 will be fixed in two places. Furthermore, in this embodiment, the shield 30 is formed in a convex curved surface shape that matches the curvature of the outer surface of the cap body 10 in a state in which the shield 30 is advanced, and the support shaft 13 is more than the center of the cap body 10. Since it is provided on the front side, when the shield 30 is retracted, the curvature of the outer surface of the cap body 10 in contact with the shield 30 becomes smaller than the curvature of the convex curved surface of the shield 30, and both ends of the shield 30 are The force to spread will work. Here, in this embodiment, the shield 30 is made of polycarbonate which is an elastic body, and the attachment portions 32 provided at both ends of the shield 30 are pressed by the pressing surface 45A of the outer member 41. The shield 30 is firmly pressed against the cap body 10 by the elastic force of the shield 30 and the pressing by the outer member 41, and the engagement between the lock hole 35 and the protrusion 16 is performed securely, and the shield 30 is firmly Fixed.

On the other hand, in the state where the shield 30 is retracted, the shield 30 is fixed by the guide pin 15 disposed at the upper end portion of the guide groove 34 of the shield 30 and the first protrusion 16A engaged with the second lock hole 35B.
That is, the first protrusion 16A and the second protrusion 16B provided in the cap body 10, and the first lock hole 35A and the second lock hole 35B provided in the shield 30 move the shield 30 in the retracted position and the advanced position. Thus, a fixing mechanism 52 for selectively fixing is configured.

According to the helmet according to the present embodiment, when the shield 30 is rotated about the center of the mounting hole 33 and advanced and retracted, the inner peripheral surface of the mounting hole 33 of the shield 30 slides on the outer peripheral surface of the support shaft 13. Since it moves, it is prevented that the rotational motion of the shield 30 is transmitted to the screw member 40, and it can prevent that the screw member 40 rotates.
Further, the outer member 41 is provided with a locking portion 46 having a regular hexagonal flat plate shape, and the engaging recess 22 formed on the inner side of the visor 20 is engaged with the locking portion 46. The rotation can be prevented by the engagement between the engaging recess 22 and the locking portion 46, and the shield 30 can be reliably prevented from loosening.
In addition, since the groove portion 44 formed on the outer peripheral surface of the shaft portion 42 of the outer member 41 is fitted into the protrusion 14 formed on the inner peripheral surface of the support shaft 13, the rotation of the outer member 41 is caused by this groove portion. This can be more reliably prevented by the fitting of 44 and the protrusion 14.

As described above, since a plurality of means for preventing the screw member 40 from rotating are provided, the screw member 40 is not rotated by the rotational movement of the shield 30 and the shield 30 is reliably prevented from loosening, and the shield 30 is wobbled. Or troubles that come off due to impact can be prevented.
Further, it is not necessary to separately provide a loosening prevention member on the screw member 40, the number of parts of the screw member 40 can be reduced, and a simple structure can be obtained, and this helmet can be manufactured at low cost.

In addition, since the screw member 40 is disposed inside the visor 20, the impact from the outside of the helmet is not directly transmitted to the screw member 40, and the screw member 40 can be prevented from loosening due to the impact, and the screw. An external cover for protecting the member 40 becomes unnecessary.
Moreover, since it becomes difficult to visually recognize the screw member 40 from the outside, it is possible to provide a helmet excellent in design.

  Here, the engaging recess 22 of the visor 20 is provided with a plurality of (three in this embodiment) ribs 23 extending in the engaging direction, and the rib surfaces of the ribs 23 face the inner surface of the visor 20 of the engaging recess 22. Since the height of the rib 23 is adjusted so as to be parallel to the side surface 22A, the engagement between the locking portion 46 of the screw member 40 and the engagement recess 22 of the visor 20 can be ensured, and these engagements Sufficient strength can be secured. Further, the three rib surfaces and the locking portion 46 material come into contact with each other, and the visor 20 can be attached stably.

Further, since the fixing mechanism 52 for selectively fixing the shield 30 between the retracted position and the advanced position is provided, the shield 30 can be used with the shield 30 firmly fixed, and the shield 30 falls or wobbles during use. Can be prevented.
Further, in a state where the shield 30 is retracted, the engagement between the first protrusion 16A and the first lock hole 35A and the second protrusion 16B and the second lock hole 35B, the elastic force of the shield 30, and the screw member 40 Since the shield 30 is firmly fixed by the pressing force at, the shield 30 is not unexpectedly dropped during use of the helmet.

  In addition, a restriction mechanism 51 that restricts the advancing / retreating range of the shield 30 is provided, and a gap between the guide pin 15 constituting the restriction mechanism 51 and the inner surface of the visor 20 is set to be smaller than the thickness of the shield 30. Therefore, the guide pin 15 is not detached from the guide groove 34, and the shield 30 can be reliably prevented from falling and falling, and the shield 30 can be advanced and retracted stably.

  As mentioned above, although the helmet by the Example of this invention was demonstrated, this invention is not limited to an above described Example, In the range which does not deviate from the meaning, it can change suitably. For example, in the above-described embodiment, the shield 30 has been described as having a shape that protects the eye portion. However, the shield 30 is not limited thereto, and the shield 30 has a shape that can protect the nose portion or the entire face. It may be. Further, instead of a security helmet, a motorcycle helmet may be used.

Moreover, although the protrusion part 14 was provided as a to-be-fitted part of the inner peripheral surface of the spindle 13, and the groove part 44 was provided as a fitting part in the outer peripheral surface of the axial part 42 of the outer side member 41, it explained to this. For example, the through hole formed in the support shaft 13 may be a square hole in cross section, and the shaft portion 42 may be a quadrangular prism shape that can be fitted into the square hole. Anything that can be prevented is acceptable.
In addition, although the description has been given with the three recesses 23 provided in the engaging recess 22 inside the visor 20, the present invention is not limited to this, and the ribs 23 may be omitted. However, in the case where a plurality of ribs 23 are provided, by adjusting the height of the ribs 23, it is possible to easily adjust the engagement strength between the engagement recess 22 and the engagement portion 46, the ease of engagement, and the like. The configuration as in this embodiment is preferable.

It is a side view in the state where the shield of the helmet concerning this example was retreated. It is a side view in the advancing state of the shield of the helmet of FIG. It is a side enlarged view of the helmet of FIG. FIG. 3 is an enlarged side view of the helmet of FIG. 2. It is XX sectional drawing in FIG. It is YY sectional drawing in FIG. It is a perspective view of the cap body which comprises the helmet of FIG. 1 and FIG. It is a perspective view of the visor which comprises the helmet of FIG. 1 and FIG. It is a front view of the screw member (outer member) which comprises the helmet of FIG. 1 and FIG. FIG. 10 is a side view of the screw member (outer member) of FIG. 9. It is ZZ sectional drawing in FIG. It is a bottom view which shows the state which attached the hammock to the helmet of FIG.

Explanation of symbols

10 Cap body 13 Support shaft 14 Projection (fitting part)
20 Visor 22 Engaging recess (engaging part)
30 Shield 40 Screw member (connecting member)
41 Outer member 42 Shaft part 43 Female thread part 44 Groove part (fitting part)
46 Locking portion 47 Inner member 48 Male screw portion 51 Restricting mechanism 52 Fixing mechanism

Claims (4)

A helmet having a cap body and a visor fixed to the outside of the cap body, wherein a shield that can be advanced and retracted is disposed between the cap body and the visor;
The cap body is provided with a support shaft that protrudes toward the outside of the cap body and rotatably holds the shield, and the support shaft cannot rotate with an engaging portion provided on the inner surface of the visor. A helmet having a connecting portion that can be engaged with the helmet is attached. The support shaft has a through-hole penetrating from the inside to the outside of the cap body,
The coupling member is provided with a shaft portion that is fitted into the through hole, and is connected to one end side of the shaft portion and disposed outside the shield, and connected to the other end side of the shaft portion. And an inner member disposed inside the cap body,
The fitting part extended in at least an axial direction was provided in the outer peripheral surface of the said shaft part, and the to-be-fitted part which can be fitted with the said fitting part was formed in the inner peripheral surface of the said through-hole. The listed helmet.   The cap body and the shield include a regulation mechanism that regulates an advancing / retreating range due to rotation of the shield, a retracted position in which the shield is accommodated between the cap body and the visor, and an advanced position protruding from the cap body The helmet according to claim 1, further comprising: a fixing mechanism that selectively fixes the head. The outer member is provided with the shaft portion having a cylindrical shape and a female screw portion formed on the inner peripheral surface, a pressing portion for pressing the shield, and the locking portion having a polygonal flat plate shape. ,
The helmet according to any one of claims 1 to 3, wherein the inner member is formed with a male screw portion that is screwed to the female screw portion.

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