JP7203404B2 - helmet shock absorption structure - Google Patents

helmet shock absorption structure Download PDF

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JP7203404B2
JP7203404B2 JP2017218518A JP2017218518A JP7203404B2 JP 7203404 B2 JP7203404 B2 JP 7203404B2 JP 2017218518 A JP2017218518 A JP 2017218518A JP 2017218518 A JP2017218518 A JP 2017218518A JP 7203404 B2 JP7203404 B2 JP 7203404B2
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cap body
impact
absorbing structure
helmet
projecting portion
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JP2019090122A (en
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昌尚 高橋
淳 馬島
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Tanizawa Seisakusho Ltd
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Tanizawa Seisakusho Ltd
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Description

本発明は、ヘルメットに設けて帽体が受けた衝撃を吸収するヘルメットの衝撃吸収構造に関する。 TECHNICAL FIELD The present invention relates to an impact absorbing structure for a helmet that is provided in the helmet and absorbs impact received by the cap body.

ヘルメットは、硬質の帽体と、帽体に取り付けられる着装体とを備えている。着装体は人頭に接するハンモック、ヘッドバンド、環ひも類等によって構成される。更に、産業用ヘルメットにおいては、帽体が受ける衝撃の運動エネルギーを吸収するために着装体以外に設ける保護パッドとして、衝撃吸収ライナが帽体の内面に取り付けられる。 A helmet includes a hard cap body and a wearing body attached to the cap body. The wearing body is composed of a hammock, a headband, a ring cord, etc. that come into contact with the human head. Furthermore, in industrial helmets, a shock absorbing liner is attached to the inner surface of the cap body as a protective pad provided outside the wearing body in order to absorb the kinetic energy of the impact received by the cap body.

衝撃吸収ライナは、一般に、発泡スチロール等により形成されており、帽体の内面の殆どの範囲を覆っている。これにより、着用者の転倒時や転落時に帽体に衝撃を受けても、そのときの衝撃力を衝撃吸収ライナが適切に吸収して人頭を保護することができる（例えば、特許文献１参照）。 The impact-absorbing liner is generally made of foamed polystyrene or the like, and covers most of the inner surface of the cap body. As a result, even if the cap body receives an impact when the wearer falls or falls, the impact-absorbing liner can appropriately absorb the impact force at that time and protect the head (see, for example, Patent Document 1). ).

特開平８－３１１７１３号公報JP-A-8-311713

しかし、帽体と着装体との間に衝撃吸収ライナが設けられていると、帽体内部の通気性が悪く、熱こもりや蒸れが生じて着用時の快適性が損なわれる不都合がある。 However, if a shock-absorbing liner is provided between the cap body and the wearer's body, the air permeability inside the cap body is poor, causing heat build-up and stuffiness, which impairs comfort when worn.

そこで、帽体の内面から衝撃吸収ライナを取り除いて、帽体内部の通気性や放熱性を確保することが考えられる。 Therefore, it is conceivable to remove the impact-absorbing liner from the inner surface of the cap body to ensure ventilation and heat dissipation inside the cap body.

一方、ハンモックも、適度な柔軟性及び伸張性により変形して帽体の外部からの衝撃を吸収するようになっているが、帽体の内面から衝撃吸収ライナを取り除いた状態で帽体が衝撃力を受けたとき、従来のハンモックの構造では当該ハンモックのみで人頭に伝わる衝撃を緩和するには不十分である。 On the other hand, the hammock also deforms due to its moderate flexibility and extensibility to absorb impacts from the outside of the cap. When subjected to force, the structure of a conventional hammock is insufficient to mitigate the impact transmitted to the human head by the hammock alone.

上記の点に鑑み、本発明は、帽体内部の蒸れを抑えることができるだけでなく、軽量且つ構造簡単で衝撃を確実に吸収することができるヘルメットの衝撃吸収構造を提供することを目的とする。 SUMMARY OF THE INVENTION In view of the above points, it is an object of the present invention to provide a shock absorbing structure for a helmet that can not only suppress stuffiness inside the cap body, but also is lightweight, has a simple structure, and can reliably absorb shocks. .

かかる目的を達成するために、本発明は、帽体と着装体とを備えるヘルメットに設けて帽体と人頭との間に位置し、帽体に受けた衝撃を吸収するヘルメットの衝撃吸収構造であって、内面が人頭に対向し、外面が前記帽体の内面に対向する基部と、該基部の外面から帽体の内面に向かって突出して、当該突出方向の先端縁が前記帽体の内面に対向する板状の突出部とを備え、前記突出部は、その突出方向に沿って延びる一対の端縁が上下位置となる姿勢に設けられ、前記帽体と前記基部との間で前記突出部が屈曲変形することにより前記帽体に受けた衝撃を吸収することを特徴とする。 In order to achieve such an object, the present invention provides a helmet shock absorbing structure which is provided in a helmet comprising a cap body and a wearing body, is positioned between the cap body and a person's head, and absorbs impact received by the cap body. a base having an inner surface facing a human head and an outer surface facing the inner surface of the cap body; and a plate-like projection facing the inner surface of the cap body, and the projection is provided in a posture in which a pair of edges extending along the projection direction are positioned vertically, and between the cap body and the base It is characterized in that the projecting portion bends and deforms to absorb the impact received by the cap body.

本発明の衝撃吸収構造は、前記突出部により、帽体内部の蒸れを防止したうえで、軽量且つ構造簡単として衝撃を確実に吸収することができる。 The impact-absorbing structure of the present invention can prevent the inside of the cap body from getting stuffy by means of the projecting portion, and can reliably absorb impacts with its light weight and simple structure.

即ち、突出部が帽体と人頭との間に位置して十分な隙間を確保でき、その隙間は、突出部が板状に形成されていることにより、通気性が確保される。これにより、帽体内部の蒸れを抑えることができる。 That is, the projecting portion is positioned between the cap body and the human head to secure a sufficient gap, and the projecting portion is formed in a plate shape to ensure air permeability in the gap. As a result, stuffiness inside the cap can be suppressed.

また、帽体が衝撃を受けると、帽体と人頭との間隙が小さくなる。帽体と人頭との間隙が小さくなると、板状の突出部に帽体内面が圧接する。帽体内面による突出部への圧接量が増加すると、突出部が潰れるようにして屈曲変形する。このとき突出部は、変形量を増加させつつ衝撃を吸収する。このように、突出部が屈曲変形することにより帽体に受けた衝撃を吸収することができる。 Also, when the cap body receives an impact, the gap between the cap body and the human head becomes smaller. When the gap between the cap body and the human head is reduced, the inner surface of the cap is pressed against the plate-like protrusion. When the amount of pressure contact by the inner surface of the cap against the protruding portion increases, the protruding portion is flexed and deformed so as to be crushed. At this time, the projecting portion absorbs the impact while increasing the amount of deformation. In this way, the bending deformation of the protruding portion can absorb the impact received by the cap body.

また、本発明においては、前記基部に対する前記突出部の厚み方向への倒れを規制する規制部が設けられていることが好ましい。前記規制部を設けることにより突出部による衝撃吸収能力を向上させることができる。即ち、帽体からの衝撃を受けた突出部が基部に重合するように倒れると、突出部の屈曲変形が小さくなり、十分に衝撃を吸収できなくなるおそれがある。そこで、前記規制部を設けて帽体から衝撃を受けても突出部が倒れないようにすることで、突出部の屈曲変形が十分に得られ、突出部の衝撃吸収能力を向上させることができる。 Moreover, in the present invention, it is preferable that a restricting portion is provided to restrict tilting of the projecting portion in the thickness direction with respect to the base portion. By providing the restricting portion, it is possible to improve the impact absorbing ability of the projecting portion. That is, if the projecting portion receives an impact from the cap body and falls so as to overlap with the base portion, the bending deformation of the projecting portion becomes small, and there is a possibility that the impact cannot be sufficiently absorbed. Therefore, by providing the restricting portion to prevent the projecting portion from collapsing even when receiving an impact from the cap body, the projecting portion can be sufficiently bent and deformed, and the shock absorbing ability of the projecting portion can be improved. .

ところで、ヘルメットが受ける衝撃は、主に帽体の上方から付与される。規制部は、突出部の倒れを防止する反面、衝撃が規制部に付与された場合には、突出部の屈曲変形が抑制されて、十分な緩衝作用が得られないおそれがある。従って、規制部を突出部の上方側に設けると、規制部側から衝撃を受けることになる。 By the way, the impact received by the helmet is mainly applied from above the cap body. The restricting portion prevents the projecting portion from collapsing, but when an impact is applied to the restricting portion, bending deformation of the projecting portion is suppressed, and there is a risk that a sufficient cushioning effect cannot be obtained. Therefore, if the restricting portion is provided on the upper side of the projecting portion, the impact is received from the restricting portion side.

そこで、前記規制部は、前記突出部の下方側に設けられていることが好ましい。これによれば、突出部の上方側から衝撃を受けて、突出部の屈曲変形を円滑に得ることができ、突出部の下方側の規制部によって突出部の倒れを確実に防止することができる。 Therefore, it is preferable that the restricting portion is provided below the projecting portion. According to this, it is possible to smoothly obtain the bending deformation of the projecting portion by receiving an impact from the upper side of the projecting portion, and it is possible to reliably prevent the projecting portion from collapsing by the restricting portion on the lower side of the projecting portion. .

また、本発明において、前記基部は、前記着装体と一体に形成されていることが好ましい。例えば、ハンモックの脚部の間に基部を連結する形状を採用することにより、ハンモックと一体成型して衝撃吸収構造を得ることが可能となり、また、ヘッドバンドに基部を連結する形状を採用することにより、ヘッドバンドと一体成型して衝撃吸収構造を得ることが可能となる。 Moreover, in the present invention, it is preferable that the base is formed integrally with the wearing body. For example, by adopting a shape in which the base is connected between the legs of the hammock, it is possible to obtain a shock absorbing structure by integrally molding with the hammock, and adopting a shape in which the base is connected to the headband. Therefore, it is possible to obtain a shock absorbing structure by integrally molding with the headband.

本発明の実施形態におけるヘルメットの説明的斜視図。BRIEF DESCRIPTION OF THE DRAWINGS The explanatory perspective view of the helmet in embodiment of this invention. 本実施形態におけるハンモックの平面図。The top view of the hammock in this embodiment. 本実施形態における衝撃吸収構造を示す拡大斜視図。FIG. 2 is an enlarged perspective view showing the shock absorbing structure in this embodiment; 本実施形態における他の衝撃吸収構造を示す拡大斜視図。FIG. 4 is an enlarged perspective view showing another shock absorbing structure in this embodiment;

本発明の一実施形態を図面に基づいて説明する。本実施形態のヘルメットは、図１に示すように、着装体の一部であるハンモック１が硬質の帽体２の内部に取り付けられる。図１においては、着装体の一部であるハンモック１のみを示しているが、着装体は、ハンモック１以外に、図示省略したヘッドバンド、耳紐（環紐類）、顎紐等を備えている。 One embodiment of the present invention will be described based on the drawings. In the helmet of this embodiment, as shown in FIG. 1, a hammock 1, which is a part of the wearing body, is attached inside a hard hat body 2. As shown in FIG. In FIG. 1, only the hammock 1, which is a part of the wearing body, is shown. there is

ハンモック１は、人頭形状に略対応する形状とされており、図１及び図２に示すように、４つの脚部（一対の前方脚部３ａ,３ｂ、及び、一対の後方脚部４ａ，４ｂ）を備えている。各脚部３ａ,３ｂ,４ａ，４ｂは、上下方向に延びる帯状に形成され、その下端には帽体２に着脱自在に連結するための連結部５が設けられている。 The hammock 1 has a shape substantially corresponding to the shape of a human head, and as shown in FIGS. 4b). Each of the leg portions 3a, 3b, 4a, 4b is formed in a band shape extending in the vertical direction, and a connecting portion 5 for detachably connecting to the cap body 2 is provided at the lower end thereof.

前頭部側に位置する一対の前方脚部３ａ,３ｂは、頭頂部側から連結部５に円弧状に延びて全体として半円形状に形成されると共に、一対の後方脚部４ａ，４ｂは、頭頂部側から連結部５に円弧状に延びて全体として半円形状に形成される。各脚部３ａ,３ｂ,４ａ，４ｂには、連結部５の近傍にヘッドバンド取付部６が形成されている。 A pair of front legs 3a and 3b positioned on the frontal side extend in an arc from the top of the head to a connecting portion 5 and are formed in a semicircular shape as a whole, and a pair of rear legs 4a and 4b , extending in an arc from the top of the head to the connecting portion 5 and formed in a semicircular shape as a whole. A headband attachment portion 6 is formed in the vicinity of the connecting portion 5 on each leg portion 3a, 3b, 4a, 4b.

このように、前方脚部３ａ,３ｂ及び後方脚部４ａ，４ｂを半円形状とすることで、側面方向の衝撃吸収能力が得られ、着用者の転倒や墜落時に受ける頭頂部側以外の方向から受ける衝撃力をハンモック１によって吸収することができる。 By making the front leg portions 3a, 3b and the rear leg portions 4a, 4b semicircular in this way, it is possible to obtain the ability to absorb shock in the lateral direction, and the direction other than the top of the head that the wearer receives when the wearer falls or falls. The hammock 1 can absorb the impact force received from.

また、ハンモック１は、前後方向に延びる一対の懸架部７を備えている。懸架部７は、前方脚部３ａ,３ｂ及び後方脚部４ａ，４ｂと共に、衝撃を分散して吸収する。これにより、前方および後方の半円形状の脚部３ａ,３ｂ,４ａ，４ｂによる衝撃吸収能力を向上させる作用を有する。 The hammock 1 also includes a pair of suspension parts 7 extending in the front-rear direction. The suspension part 7 disperses and absorbs the impact together with the front legs 3a, 3b and the rear legs 4a, 4b. As a result, the front and rear semi-circular legs 3a, 3b, 4a, 4b have the effect of improving the impact absorption capability.

前方脚部３ａ,３ｂの間には、横方向に延びる上下一対の帯状の前方桁部８ａ，８ｂが設けられている。後方脚部４ａ，４ｂの間には、横方向に延びる上下一対の帯状の後方桁部９ａ，９ｂが設けられている。前方脚部３ａ,３ｂと後方脚部４ａ，４ｂとの夫々の片側ずつの間には、前後方向に延びる上下一対の帯状の側方桁部１０ａ，１０ｂが設けられている。 Between the front leg portions 3a and 3b, a pair of upper and lower belt-shaped front beam portions 8a and 8b extending in the horizontal direction are provided. Between the rear leg portions 4a and 4b, a pair of upper and lower belt-shaped rear beam portions 9a and 9b extending in the horizontal direction are provided. A pair of upper and lower band-shaped side beams 10a, 10b extending in the front-rear direction are provided between the front legs 3a, 3b and the rear legs 4a, 4b, respectively.

側方桁部１０ａ，１０ｂと後方桁部９ａ，９ｂは、夫々衝撃吸収構造を備えている。本実施形態における衝撃吸収構造は、突出部１１と、規制部１２とを備えている。 The side girders 10a, 10b and the rear girders 9a, 9b each have a shock absorbing structure. The shock absorbing structure in this embodiment includes a projecting portion 11 and a restricting portion 12 .

突出部１１と規制部１２とは、側方桁部１０ａ，１０ｂと後方桁部９ａ，９ｂの外面から外方に向かって（帽体２の内面に向かって）突出している。側方桁部１０ａ，１０ｂと後方桁部９ａ，９ｂとは、何れも本発明の基部に相当し、この基部はハンモック１に一体に形成されている。 The projecting portion 11 and the restricting portion 12 protrude outward (toward the inner surface of the cap body 2) from the outer surfaces of the lateral beam portions 10a, 10b and the rear beam portions 9a, 9b. The side girders 10a, 10b and the rear girders 9a, 9b all correspond to the base of the present invention, and the base is integrally formed with the hammock 1. As shown in FIG.

突出部１１は、略矩形状の板状に形成されており、縦姿勢（即ち、突出方向に沿って延びる一対の端縁が上下位置となる姿勢）で設けられている。これにより、帽体２内部での空気の流れに対して突出部１１が殆ど邪魔にならず、帽体２内部の通気性をかくして蒸れ等が抑えられる。 The protruding portion 11 is formed in a substantially rectangular plate shape, and is provided in a vertical posture (that is, a posture in which a pair of edges extending along the protruding direction are positioned vertically). As a result, the projecting portion 11 hardly interferes with the flow of air inside the cap body 2, and the air permeability inside the cap body 2 is hidden to suppress stuffiness.

規制部１２は、突出部１１の下方側である下方端部に一体に連結されており、図３に示すように、突出部１１の広面部１１ａに対して交差する方向に広がる形状に形成されている。これによって、規制部１２は、突出部１１の厚み方向への倒れを規制している。 The restricting portion 12 is integrally connected to the lower end portion of the protruding portion 11, and is formed in a shape that expands in a direction intersecting the wide surface portion 11a of the protruding portion 11, as shown in FIG. ing. Thereby, the restricting portion 12 restricts the inclination of the projecting portion 11 in the thickness direction.

側方桁部１０ａ，１０ｂに設けられている衝撃吸収構造の突出部１１は、図３に示すように、所定間隔を介して２つを１組として２組設けられている。１組単位の両突出部１１の下端部には、規制部１２が連続して設けられている。下側の後方桁部９ｂも側方桁部１０ａ，１０ｂと同様の衝撃吸収構造を備えている。 As shown in FIG. 3, two sets of projections 11 of the shock absorbing structure provided on the side beams 10a and 10b are provided with a predetermined interval between them. A restricting portion 12 is continuously provided at the lower end portions of both protruding portions 11 in units of one set. The lower rear girders 9b also have the same impact absorbing structure as the side girders 10a and 10b.

上側の後方桁部９ａに設けられている衝撃吸収構造の突出部１１は、図４に示すように、所定間隔を介して４つ配設され、４つの突出部１１の下端部には、規制部１２が連続して設けられている。 As shown in FIG. 4, four projecting portions 11 of the shock absorbing structure provided on the upper rear girder portion 9a are arranged at predetermined intervals. A portion 12 is continuously provided.

本実施形態による衝撃吸収構造は、次のようにして衝撃を吸収する。即ち、帽体２の上方外部から衝撃が付与されると、ハンモック１の衝撃吸収作用により各脚部３ａ,３ｂ,４ａ，４ｂ及び懸架部７が延びる。これに伴い、帽体２からの衝撃は、帽体２の内面が突出部１１に圧接するようにして突出部１１に伝達される。このとき、突出部１１における先端縁１１ｂと上端縁１１ｃとが交わる角部１１ｄから衝撃が突出部１１に伝達される。そして、規制部１２によって突出部１１の倒れが防止されていることにより、突出部１１が確実に屈曲変形して衝撃を吸収緩和する。更に、規制部１２が突出部１１の下端部に設けられていることにより、規制部１２が突出部１１の屈曲変形を阻害することがなく、突出部１１において確実に衝撃が吸収される。 The shock absorbing structure according to this embodiment absorbs shock as follows. That is, when an impact is applied from the upper outside of the cap body 2, the leg portions 3a, 3b, 4a, 4b and the suspension portion 7 extend due to the impact absorbing action of the hammock 1. As shown in FIG. Along with this, the impact from the cap body 2 is transmitted to the protruding part 11 so that the inner surface of the cap body 2 is pressed against the protruding part 11 . At this time, the impact is transmitted to the projecting portion 11 from the corner portion 11d where the tip edge 11b and the upper edge 11c of the projecting portion 11 intersect. Since the protrusion 11 is prevented from collapsing by the restricting portion 12, the protrusion 11 is reliably bent and deformed to absorb and mitigate the impact. Further, since the restricting portion 12 is provided at the lower end portion of the protruding portion 11 , the restricting portion 12 does not hinder the bending deformation of the protruding portion 11 , and the impact is reliably absorbed by the protruding portion 11 .

なお、本実施形態においては、規制部１２が突出部１１の下方側に設けられているものを示したが、これに限らず、例えば、規制部１２は突出部１１の中央位置に設けられていてもよい。 In this embodiment, the restricting portion 12 is provided on the lower side of the projecting portion 11, but the present invention is not limited to this. may

また、本実施形態においては、ハンモック１の一部である側方桁部１０ａ，１０ｂ及び後方桁部９ａ，９ｂを基部として突出部１１と規制部１２とを一体に形成した衝撃吸収構造を示したが、基部をハンモック１と別体で形成して、帽体と人頭との間の所望の位置に衝撃吸収構造を配置してもよい。 Further, in the present embodiment, a shock absorbing structure is shown in which the protruding portion 11 and the restricting portion 12 are formed integrally with the lateral beam portions 10a, 10b and the rear beam portions 9a, 9b, which are part of the hammock 1, as base portions. However, the base may be formed separately from the hammock 1, and the shock absorbing structure may be arranged at a desired position between the cap body and the human head.

また、本実施形態においては、前方桁部８ａ，８ｂに突出部１１を設けていないものを示したが、図示しないが、必要に応じて前方桁部８ａ，８ｂに突出部１１を設けてもよい。この場合には、前方桁部８ａ，８ｂが本発明の衝撃吸収構造における基部として機能する。 Further, in the present embodiment, the front girder portions 8a and 8b are shown without the protrusions 11. Although not shown, the front girder portions 8a and 8b may be provided with the protrusions 11 as necessary. good. In this case, the front girder portions 8a and 8b function as base portions in the shock absorbing structure of the present invention.

また、本実施形態においては、着装体を構成するハンモック１に衝撃吸収構造を設けたものにいて説明したが、図示しないが着装体を構成するヘッドバンドに衝撃吸収構造を設けてもよい。 Further, in the present embodiment, the hammock 1 constituting the wearing body is provided with the shock absorbing structure, but although not shown, the headband constituting the wearing body may be provided with the shock absorbing structure.

１…ハンモック（着装体）、２…帽体、９ａ，９ｂ…後方桁部（基部）、１０ａ，１０ｂ…側方桁部（基部）、１１…突出部、１１ｂ…先端縁、１１ｃ…上端縁、１２…規制部。 DESCRIPTION OF SYMBOLS 1... Hammock (wearing body), 2... Cap body, 9a, 9b... Rear girder part (base part), 10a, 10b... Side girder part (base part), 11... Protruding part, 11b... Tip edge, 11c... Upper edge , 12... a regulation section.

Claims (4)

帽体と着装体とを備えるヘルメットに設けて帽体と人頭との間に位置し、帽体に受けた衝撃を吸収するヘルメットの衝撃吸収構造であって、
内面が人頭に対向し、外面が前記帽体の内面に対向する基部と、該基部の外面から帽体の内面に向かって突出して、当該突出方向の先端縁が前記帽体の内面に対向する板状の突出部とを備え、
前記突出部は、その突出方向に沿って延びる一対の端縁が上下位置となる姿勢に設けられ、
前記帽体と前記基部との間で前記突出部が屈曲変形することにより前記帽体に受けた衝撃を吸収することを特徴とするヘルメットの衝撃吸収構造。 A shock absorbing structure for a helmet provided in a helmet comprising a cap body and a wearing body, positioned between the cap body and a person's head, and absorbing a shock received by the cap body,
a base portion whose inner surface faces the human head and whose outer surface faces the inner surface of the cap body; and a plate-shaped protrusion that
The protruding portion is provided in a posture in which a pair of edges extending along the protruding direction are positioned vertically,
An impact absorbing structure for a helmet, wherein the protruding portion bends and deforms between the cap body and the base to absorb an impact received by the cap body. 前記基部に対する前記突出部の厚み方向への倒れを規制する規制部が設けられていること特徴とする請求項１記載のヘルメットの衝撃吸収構造。 2. The impact absorbing structure for a helmet according to claim 1, further comprising a restricting portion for restricting tilting of the projecting portion in the thickness direction with respect to the base portion. 前記規制部は、前記突出部の下方側に設けられていることを特徴とする請求項２記載のヘルメットの衝撃吸収構造。 3. The impact absorbing structure for a helmet according to claim 2, wherein the restricting portion is provided below the projecting portion. 前記基部は、前記着装体と一体に形成されていることを特徴とする請求項１～３の何れか１項記載のヘルメットの衝撃吸収構造。 4. The impact absorbing structure for a helmet according to claim 1, wherein the base is formed integrally with the wearing body.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4987609A (en) 1988-09-13 1991-01-29 Schuberth-Werk Gmbh & Co., Kg Military safety helmet
JP2005105487A (en) 2003-09-30 2005-04-21 Honda Motor Co Ltd Ventilation structure for helmet

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016075021A (en) * 2014-10-07 2016-05-12 株式会社谷沢製作所 helmet

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4987609A (en) 1988-09-13 1991-01-29 Schuberth-Werk Gmbh & Co., Kg Military safety helmet
JP2005105487A (en) 2003-09-30 2005-04-21 Honda Motor Co Ltd Ventilation structure for helmet

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