JP2013204213A - Size adjusting strap and helmet - Google Patents
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- JP2013204213A JP2013204213A JP2012077286A JP2012077286A JP2013204213A JP 2013204213 A JP2013204213 A JP 2013204213A JP 2012077286 A JP2012077286 A JP 2012077286A JP 2012077286 A JP2012077286 A JP 2012077286A JP 2013204213 A JP2013204213 A JP 2013204213A
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Abstract
Description
本発明は、ヘルメットやバッグなどの各使用に適したサイズ調節バンド、並びに、そのようなサイズ調節バンドを利用したヘルメットに関するものである。 The present invention relates to a size adjustment band suitable for each use such as a helmet and a bag, and a helmet using such a size adjustment band.
図９に示す従来のサイズ調節バンドにおいては、両保持帯５，６間に間隔調節機構が設けられている（例えば特許文献１を参照）。この間隔調節機構においては、一方の保持帯５側にある第一可動部７と他方の保持帯６側にある第二可動部８とが互いに並べられて両保持帯５，６が互いに離間する向きと互いに接近する向きとに移動可能に支持されているとともに、第一可動部７に設けられたラック１０と第二可動部８に設けられたラック１１とに噛み合うピニオン２４が回転可能に支持され、ピニオン２４の回転に伴い第一可動部７と第二可動部８とがラック１０，１１を介して互いに移動して両保持帯５，６の間隔が調節される。 In the conventional size adjustment band shown in FIG. 9, an interval adjustment mechanism is provided between the holding bands 5 and 6 (see, for example, Patent Document 1). In this distance adjusting mechanism, the first movable part 7 on the one holding band 5 side and the second movable part 8 on the other holding band 6 side are arranged side by side, and the both holding bands 5 and 6 are separated from each other. The pinion 24 meshed with the rack 10 provided in the first movable part 7 and the rack 11 provided in the second movable part 8 is rotatably supported while being supported so as to be movable in a direction and a direction approaching each other. Then, as the pinion 24 rotates, the first movable portion 7 and the second movable portion 8 move to each other via the racks 10 and 11, and the distance between the holding bands 5 and 6 is adjusted.
しかし、両保持帯５，６の最接近状態Ｑまたは最離間状態Ｐで、ピニオン２４に必要以上の回転力を加えると、ラック１０，１１とピニオン２４との間の噛合部が欠損するおそれがあった。また、ラック１０，１１とピニオン２４とを一旦組み立ててしまうと、両保持帯５，６の第一可動部７と第二可動部８との位置関係が決まるため、組み立て後にそれらの位置関係を変更することが難しくなり、組み立て時にピニオン２４が両保持帯５，６間の中央に常に位置するように注意する必要があり、間隔調節機構Ｍの組立作業性が悪くなっていた。 However, if the rotational force more than necessary is applied to the pinion 24 in the closest state Q or the most separated state P of the holding bands 5 and 6, there is a possibility that the meshing portion between the racks 10 and 11 and the pinion 24 is lost. there were. In addition, once the racks 10 and 11 and the pinion 24 are assembled, the positional relationship between the first movable part 7 and the second movable part 8 of the holding bands 5 and 6 is determined. It becomes difficult to change, and it is necessary to take care that the pinion 24 is always located at the center between the holding bands 5 and 6 at the time of assembling, and the assembling workability of the distance adjusting mechanism M is deteriorated.
この発明は、各種用途のヘルメットなどに適したサイズ調節バンドの間隔調節機構において、ラックとピニオンとの間の噛合部の欠損を防止するとともに間隔調節機構の組立作業を容易に行うことを目的としている。 The object of the present invention is to prevent the gap between the rack and the pinion from being lost in the distance adjusting mechanism of the size adjusting band suitable for helmets for various uses and to facilitate the assembly work of the distance adjusting mechanism. Yes.
後記実施形態（図１〜４に示す第１実施形態、図５〜６に示す第２実施形態、図７〜８に示す第３実施形態）の図面の符号を援用して本発明を説明する。
請求項１の発明にかかるサイズ調節バンド（３）は、第１〜３実施形態に対応し、下記のように構成されている。
The present invention will be described with reference to the drawings of the following embodiments (the first embodiment shown in FIGS. 1 to 4, the second embodiment shown in FIGS. 5 to 6, and the third embodiment shown in FIGS. 7 to 8). .
The size adjustment band (3) according to the invention of claim 1 corresponds to the first to third embodiments and is configured as follows.
両保持帯（５，６）間に設けた間隔調節機構（Ｍ）においては、両保持帯（５，６）のうち一方の保持帯（５）側にある第一可動部（７）と他方の保持帯（６）側にある第二可動部（８）とを互いに並べて両保持帯（５，６）が互いに離間する向きと互いに接近する向きとに移動可能に支持部材（１３，１４）に対し支持するとともに、第一可動部（７）に設けたラック（１０）と第二可動部（８）に設けたラック（１１）とに噛み合うピニオン（２４）を支持部材（１３，１４）に対し回転可能に支持し、ピニオン（２４）の回転に伴い第一可動部（７）と第二可動部（８）とをラック（１０，１１）を介して互いに移動させて両保持帯（５，６）の間隔を調節可能にしている。 In the distance adjusting mechanism (M) provided between the two holding bands (5, 6), the first movable part (7) on the one holding band (5) side of the two holding bands (5, 6) and the other The support members (13, 14) are arranged such that the second movable parts (8) on the holding band (6) side of each other are arranged side by side and the holding bands (5, 6) are movable in directions away from each other and in directions close to each other. And a pinion (24) that meshes with a rack (10) provided in the first movable part (7) and a rack (11) provided in the second movable part (8). The first movable part (7) and the second movable part (8) are moved relative to each other via the racks (10, 11) as the pinion (24) rotates, so that both holding bands ( 5, 6) is adjustable.
両保持帯（５，６）が最離間した状態（Ｐ）で互いに並ぶ第一可動部（７）及び第二可動部（８）の一端部（９ｃ）と、両保持帯（５，６）が最接近した状態（Ｑ）で互いに並ぶ第一可動部（７）及び第二可動部（８）の他端部（９ｄ）とのうち、少なくとも第一可動部（７）及び第二可動部（８）の他端部（９ｄ）には、ピニオン（２４）を支える弾性部（３５）を設けている。 The first movable part (7) and the one end part (9c) of the second movable part (8) lined up in a state (P) in which the both holding bands (5, 6) are farthest apart, and both holding bands (5, 6) At least the first movable part (7) and the second movable part among the other movable part (9d) of the first movable part (7) and the second movable part (8) that are aligned with each other in the closest state (Q) The other end (9d) of (8) is provided with an elastic part (35) that supports the pinion (24).
第一可動部（７）及び第二可動部（８）のラック（１０，１１）において、第一可動部（７）及び第二可動部（８）の移動方向（Ｙ）に沿って並設された各歯部（３１，３２，３３）で、その移動方向（Ｙ）の両側の端に位置する一または複数の端歯部（３１，３２）のうち、少なくとも第一可動部（７）及び第二可動部（８）の他端部（９ｄ）側の端歯部（３１，３２）における全歯たけ（Ｈ３１，Ｈ３２）を、その端歯部（３１，３２）以外の中間歯部（３３）の全歯たけ（Ｈ３３）より小さく設定している。 In the racks (10, 11) of the first movable part (7) and the second movable part (8), they are juxtaposed along the moving direction (Y) of the first movable part (7) and the second movable part (8). Of the tooth portions (31, 32, 33) thus formed, at least the first movable portion (7) among one or a plurality of end tooth portions (31, 32) positioned at both ends in the moving direction (Y). And the intermediate tooth part other than the end tooth part (31, 32) is used for all tooth depth (H31, H32) in the end tooth part (31, 32) on the other end part (9d) side of the second movable part (8). It is set smaller than the total tooth depth (H33) of (33).
前記最接近状態（Ｑ）でラック（１０，１１）の他端部（９ｄ）側の端歯部（３１，３２）に噛み合ったピニオン（２４）が、弾性部（３５）の弾性変形に伴う端歯部（３１，３２）との噛み合いの解除によりラック（１０，１１）に対し空回りし得る。 The pinion (24) meshed with the end teeth (31, 32) on the other end (9d) side of the rack (10, 11) in the closest approach (Q) is accompanied by elastic deformation of the elastic part (35). By releasing the meshing with the end teeth (31, 32), the rack (10, 11) can be idled.
請求項１の発明では、ラック（１０，１１）において、端歯部（３１，３２）の全歯たけ（Ｈ３１，Ｈ３２）をその端歯部（３１，３２）以外の中間歯部（３３）の全歯たけ（Ｈ３３）より小さく設定しているので、両保持帯(５，６)の最接近状態（Ｑ）でピニオン（２４）に必要以上の回転力が加わると、ピニオン（２４）が弾性部（３５）の弾性変形に伴いラック（１０，１１）に対し空回りし、ラック（１０，１１）とピニオン（２４）との間の噛合部の欠損を防止することができる。また、両保持帯（５，６）の最接近状態（Ｑ）でピニオン（２４）を空回りさせた後に、ピニオン（２４）に対する回転力を解除すると、弾性部（３５）が変形前の形態に復帰してラック（１０，１１）がピニオン（２４）と噛合した状態になるので、ピニオン（２４）を空回りさせた後に逆方向に回転させれば、ピニオン（２４）が両保持帯（５，６）間の中央に常に位置するようにそれらの位置関係を容易に変更することができ、ピニオン（２４）に対する両保持帯（５，６）の位置を均等とすることができる。従って、組み立て時にピニオン（２４）が両保持帯（５，６）間の中央に常に位置するように注意する必要がなくなり、間隔調節機構（Ｍ）の組立作業を容易に行うことができる。 In the invention of claim 1, in the rack (10, 11), the intermediate tooth portion (33) other than the end tooth portion (31, 32) is used as the entire tooth depth (H31, H32) of the end tooth portion (31, 32). Therefore, if excessive rotation force is applied to the pinion (24) in the closest state (Q) of the two holding bands (5, 6), the pinion (24) Accompanying the elastic deformation of the elastic part (35), the rack (10, 11) rotates idle, and the meshing part between the rack (10, 11) and the pinion (24) can be prevented from being lost. Further, after rotating the pinion (24) in the closest state (Q) of the two holding bands (5, 6) and then releasing the rotational force on the pinion (24), the elastic part (35) is returned to the form before deformation. Since the rack (10, 11) is engaged with the pinion (24) after returning, the pinion (24) is rotated in the opposite direction after the pinion (24) is idled. 6) The positional relationship between them can be easily changed so that they are always located at the center between them, and the positions of both holding bands (5, 6) with respect to the pinion (24) can be made equal. Therefore, it is not necessary to take care that the pinion (24) is always located at the center between the two holding bands (5, 6) during assembly, and the assembling work of the distance adjusting mechanism (M) can be easily performed.
請求項１の発明を前提とする請求項２の発明（第１〜３実施形態に対応）において、前記第一可動部（７）及び第二可動部（８）の一端部（９ｃ）にも、ピニオン（２４）を支える弾性部（３５）を設け、前記第一可動部（７）及び第二可動部（８）の一端部（９ｃ）側の端歯部（３１，３２）における全歯たけ（Ｈ３１，Ｈ３２）も、その端歯部（３１，３２）以外の中間歯部（３３）の全歯たけ（Ｈ３３）より小さく設定し、前記最離間状態（Ｐ）でラック（１０，１１）の一端部（９ｃ）側の端歯部（３１，３２）に噛み合ったピニオン（２４）も、弾性部（３５）の弾性変形に伴う端歯部（３１，３２）との噛み合いの解除によりラック（１０，１１）に対し空回りし得る。 In the invention of claim 2 (corresponding to the first to third embodiments) based on the invention of claim 1, the first movable portion (7) and the one end portion (9c) of the second movable portion (8) are also provided. The elastic part (35) which supports the pinion (24) is provided, and all teeth in the end tooth parts (31, 32) on the one end part (9c) side of the first movable part (7) and the second movable part (8) are provided. Takes (H31, H32) are also set smaller than the total tooth depth (H33) of the intermediate teeth (33) other than the end teeth (31, 32), and the racks (10, 11) are in the most separated state (P). ) Of the pinion (24) meshed with the end teeth (31, 32) on the one end (9c) side is also released by meshing with the end teeth (31, 32) due to elastic deformation of the elastic section (35). It can be idle with respect to the rack (10, 11).
請求項２の発明では、ラック（１０，１１）において、端歯部（３１，３２）の全歯たけ（Ｈ３１，Ｈ３２）をその端歯部（３１，３２）以外の中間歯部（３３）の全歯たけ（Ｈ３３）より小さく設定しているので、両保持帯(５，６)の最離間状態（Ｐ）でピニオン（２４）に必要以上の回転力が加わると、ピニオン（２４）が弾性部（３５）の弾性変形に伴いラック（１０，１１）に対し空回りし、ラック（１０，１１）とピニオン（２４）との間の噛合部の欠損を防止することができる。また、両保持帯（５，６）の最離間状態（Ｐ）でピニオン（２４）を空回りさせた後に、ピニオン（２４）に対する回転力を解除すると、弾性部（３５）が変形前の形態に復帰してラック（１０，１１）がピニオン（２４）と噛合した状態になるので、ピニオン（２４）を空回りさせた後に逆方向に回転させれば、ピニオン（２４）が両保持帯（５，６）間の中央に常に位置するようにそれらの位置関係を容易に変更することができ、ピニオン（２４）に対する両保持帯（５，６）の位置を均等とすることができる。従って、組み立て時にピニオン（２４）が両保持帯（５，６）間の中央に常に位置するように注意する必要がなくなり、間隔調節機構（Ｍ）の組立作業を容易に行うことができる。 According to the invention of claim 2, in the rack (10, 11), the intermediate tooth portion (33) other than the end tooth portion (31, 32) is used as the entire tooth depth (H31, H32) of the end tooth portion (31, 32). Therefore, when the rotational force more than necessary is applied to the pinion (24) in the most separated state (P) of the two holding bands (5, 6), the pinion (24) Accompanying the elastic deformation of the elastic part (35), the rack (10, 11) rotates idle, and the meshing part between the rack (10, 11) and the pinion (24) can be prevented from being lost. In addition, when the pinion (24) is idled in the most separated state (P) of the two holding bands (5, 6) and then the rotational force on the pinion (24) is released, the elastic part (35) returns to the form before deformation. Since the rack (10, 11) is engaged with the pinion (24) after returning, the pinion (24) is rotated in the opposite direction after the pinion (24) is idled. 6) The positional relationship between them can be easily changed so that they are always located at the center between them, and the positions of both holding bands (5, 6) with respect to the pinion (24) can be made equal. Therefore, it is not necessary to take care that the pinion (24) is always located at the center between the two holding bands (5, 6) during assembly, and the assembling work of the distance adjusting mechanism (M) can be easily performed.
下記の請求項３〜６の発明は、ラック（１０，１１）の端歯部（３１，３２）とピニオン（２４）との噛み合いをより一層容易に解除させてピニオン（２４）を空回りさせることができる。 In the inventions of the following third to sixth aspects, the engagement between the end teeth (31, 32) of the rack (10, 11) and the pinion (24) is more easily released, and the pinion (24) is made idle. Can do.
請求項１または請求項２の発明を前提とする請求項３の発明（第１〜３実施形態に対応）において、前記一または複数の端歯部（３１，３２）のうち最端歯部（３１）は、歯厚方向の両側の噛合面のうち、ピニオン（２４）の回転向き（Ｌ，Ｒ）に対向する片側の噛合面に、ピニオン（２４）の回転向き（Ｌ，Ｒ）側へ傾く逃げ面（３１ａ）を有している。 In the invention of claim 3 (corresponding to the first to third embodiments) based on the invention of claim 1 or claim 2, the most end tooth portion (31, 32) of the one or more end tooth portions (31, 32). 31) of the meshing surfaces on both sides in the tooth thickness direction, the meshing surface on one side facing the rotational direction (L, R) of the pinion (24) is directed to the rotational direction (L, R) side of the pinion (24). It has an inclined flank (31a).
請求項１または請求項２の発明を前提とする請求項４の発明（第１実施形態に対応）において、前記複数の端歯部（３１，３２）における全歯たけ（Ｈ３１，Ｈ３２）は、中間歯部(３３)側から最端歯部(３１)側に向うに従い次第に中間歯部(３３)の全歯たけ（Ｈ３３）より小さく設定されている。 In the invention of claim 4 (corresponding to the first embodiment) premised on the invention of claim 1 or claim 2, the total tooth depth (H31, H32) in the plurality of end tooth portions (31, 32) is: As it goes from the intermediate tooth portion (33) side to the endmost tooth portion (31) side, it is gradually set smaller than the total tooth depth (H33) of the intermediate tooth portion (33).
請求項４の発明を前提とする請求項５の発明（第１実施形態に対応）において、前記複数の端歯部（３１，３２）は、それぞれ、歯厚方向の両側の噛合面のうち、ピニオン（２４）の回転向き（Ｌ，Ｒ）に対向する片側の噛合面に、ピニオン（２４）の回転向き（Ｌ，Ｒ）側へ傾く逃げ面（３１ａ，３２ａ）を有している。 In the invention of claim 5 (corresponding to the first embodiment) based on the invention of claim 4, the plurality of end tooth portions (31, 32) are respectively meshed surfaces on both sides in the tooth thickness direction. On one side of the meshing surface facing the rotational direction (L, R) of the pinion (24), there is a flank (31a, 32a) inclined to the rotational direction (L, R) side of the pinion (24).
請求項５の発明を前提とする請求項６の発明（第１実施形態に対応）にかかる複数の端歯部（３１，３２）において、第一可動部（７）及び第二可動部（８）の移動方向（Ｙ）に対する逃げ面（３１ａ，３２ａ）の傾斜角度（θ３１，θ３２）は、中間歯部（３３）側から最端歯部（３１）側に向うに従い次第に小さく設定されている。 In the plurality of end teeth (31, 32) according to the invention of claim 6 (corresponding to the first embodiment) based on the invention of claim 5, the first movable part (7) and the second movable part (8 The inclination angle (θ31, θ32) of the flank (31a, 32a) with respect to the movement direction (Y) is gradually set smaller from the intermediate tooth portion (33) side toward the outermost tooth portion (31) side. .
請求項１〜６のうちいずれか一つの請求項の発明を前提とする請求項７の発明（第１〜３実施形態に対応）において、前記弾性部は撓み許容孔（３４）により形成された両持ち梁状ばね（３５）である。請求項７の発明では、弾性部（３５）を容易に形成することができる。 In the invention of Claim 7 (corresponding to the first to third embodiments) based on the invention of any one of Claims 1 to 6, the elastic portion is formed by a deflection allowing hole (34). It is a doubly supported beam-like spring (35). In the invention of claim 7, the elastic portion (35) can be easily formed.
請求項８の発明（第１〜３実施形態に対応）にかかるヘルメット（１）においては、請求項１〜７のうちいずれか一つの請求項の発明にかかるサイズ調節バンド（３）を帽体（２）の頭挿入開口部（２ａ）に取り付け、このサイズ調節バンド（３）の間隔調節機構（Ｍ）を帽体（２）の頭挿入開口部（２ａ）の後側に配設している。請求項８の発明では、請求項１〜７のうちいずれか一つの請求項の発明の効果をヘルメット（１）において発揮させることができる。 In the helmet (1) according to the invention of claim 8 (corresponding to the first to third embodiments), the size adjusting band (3) according to the invention of any one of claims 1 to 7 is a cap body. It is attached to the head insertion opening (2a) of (2), and the distance adjustment mechanism (M) of this size adjustment band (3) is arranged behind the head insertion opening (2a) of the cap body (2). Yes. In invention of Claim 8, the effect of invention of any one of Claims 1-7 can be exhibited in a helmet (1).
次に、請求項以外の技術的思想について実施形態の図面の符号を援用して説明する。
請求項７の発明を前提とする第９の発明（第１〜３実施形態に対応）において、前記両持ち梁状ばね（３５）は、第一可動部（７）及び第二可動部（８）の一端部（９ｃ）または第一可動部（７）及び第二可動部（８）の他端部（９ｄ）で、第一可動部（７）及び第二可動部（８）のラック（１０，１１）の端歯部（３１，３２）に隣接して配設されている。第９の発明では、各持ち梁状ばね（３５）をラック（１０，１１）の端歯部（３１，３２）に隣接して配設することにより、ラック（１０，１１）の端歯部（３１，３２）とピニオン（２４）との噛み合いを容易に解除させることができる。
Next, technical ideas other than the claims will be described with reference to the reference numerals in the drawings of the embodiments.
In a ninth invention based on the invention of claim 7 (corresponding to the first to third embodiments), the doubly supported beam-like spring (35) includes a first movable part (7) and a second movable part (8 ) Of the first movable part (7) and the second movable part (8) at the other end part (9d) of the first movable part (9c) or the first movable part (7) and the second movable part (8) ( 10 and 11) are arranged adjacent to the end teeth (31, 32). In the ninth aspect of the present invention, the end tooth portions of the rack (10, 11) are provided by disposing each cantilever spring (35) adjacent to the end teeth (31, 32) of the rack (10, 11). The meshing between (31, 32) and the pinion (24) can be easily released.
第９の発明を前提とする第１０の発明（第１実施形態に対応）において、前記両持ち梁状ばね（３５）は、第一可動部（７）及び第二可動部（８）のラック（１０，１１）の端歯部（３１，３２）に隣接する中間位置から、そのラック（１０，１１）の中間歯部（３３）に隣接する端位置と、第一可動部（７）のラック（１０）と第二可動部（８）のラック（１１）との間に設けたピニオン相対移動溝（９）に対しピニオン（２４）の相対移動方向（Ｙ）で隣接する端位置とにわたり延設されている。第１０の発明では、ピニオン（２４）による押圧により両持ち梁状ばね（３５）を容易に撓ませることができる。 In a tenth invention based on the ninth invention (corresponding to the first embodiment), the doubly supported beam spring (35) is a rack of the first movable part (7) and the second movable part (8). From the intermediate position adjacent to the end tooth portion (31, 32) of (10, 11), the end position adjacent to the intermediate tooth portion (33) of the rack (10, 11), and the first movable portion (7) Over an end position adjacent to the pinion relative movement groove (9) provided between the rack (10) and the rack (11) of the second movable part (8) in the relative movement direction (Y) of the pinion (24). It is extended. In the tenth invention, the doubly supported beam-like spring (35) can be easily bent by the pressing by the pinion (24).
第９の発明を前提とする第１１の発明（第２〜３実施形態に対応）において、前記両持ち梁状ばね（３５）は、第一可動部（７）及び第二可動部（８）の一端部（９ｃ）または第一可動部（７）及び第二可動部（８）の他端部（９ｄ）で、第一可動部（７）のラック（１０）と第二可動部（８）のラック（１１）との間に設けたピニオン相対移動溝（９）に対しピニオン（２４）の相対移動方向（Ｙ）で隣接して配設されて、第一可動部（７）のラック（１０）の端歯部（３１）及び第二可動部（８）のラック（１１）の端歯部（３１）に隣接する位置から延設されている。第１１の発明では、ピニオン（２４）による押圧により両持ち梁状ばね（３５）を容易に撓ませることができる。 In an eleventh invention (corresponding to the second to third embodiments) based on the ninth invention, the doubly supported beam-like spring (35) includes a first movable part (7) and a second movable part (8). One end (9c) of the first movable portion (7) and the other movable portion (9d) of the second movable portion (8), the rack (10) of the first movable portion (7) and the second movable portion (8). The rack of the first movable part (7) is disposed adjacent to the pinion relative movement groove (9) provided between the rack (11) and the rack (11) in the relative movement direction (Y) of the pinion (24). It extends from the position adjacent to the end tooth part (31) of (10) and the end tooth part (31) of the rack (11) of the second movable part (8). In the eleventh aspect of the invention, the doubly supported beam-like spring (35) can be easily bent by pressing with the pinion (24).
本発明は、各種用途のヘルメット（１）などに適したサイズ調節バンド（３）において、両保持帯（５，６）の最接近状態（Ｑ）または最離間状態（Ｐ）で、ピニオン（２４）に必要以上の回転力を加えてもラック（１０，１１）とピニオン（２４）との間の噛合部の欠損を防止することができる。また、ピニオン（２４）をラック（１０，１１）に対し空回りさせた後に、ピニオン（２４）に対する回転力の解除により、ラック（１０，１１）がピニオン（２４）と噛合した状態に自ずと設定されるので、ピニオン（２４）を空回りさせた後に逆方向に回転させれば、ピニオン（２４）が両保持帯（５，６）間の中央に常に位置するようにそれらの位置関係を容易に変更することができ、ピニオン（２４）に対する両保持帯（５，６）の位置を均等とすることができる。従って、組み立て時にピニオン（２４）が両保持帯（５，６）間の中央に常に位置するように注意する必要がなくなり、間隔調節機構（Ｍ）の組立作業を容易に行うことができる。さらに、このサイズ調節バンド（３）をヘルメット（１）の頭保持バンドとして利用すれば、ピニオン（２４）に対する両保持帯（５，６）の位置を均等とすることができるため、美観に優れ、しかも頭部へのフィット感にも優れたヘルメット（１）を提供することができる。 In the size adjustment band (3) suitable for the helmet (1) for various uses, the present invention provides the pinion (24) in the closest state (Q) or the most separated state (P) of the two holding bands (5, 6). ) Can be prevented from being lost between the rack (10, 11) and the pinion (24) even if a rotational force more than necessary is applied. In addition, after the pinion (24) is idled with respect to the rack (10, 11), the rack (10, 11) is automatically set in mesh with the pinion (24) by releasing the rotational force on the pinion (24). Therefore, if the pinion (24) is idled and then rotated in the reverse direction, the positional relationship between the pinion (24) is easily changed so that the pinion (24) is always located at the center between the two holding bands (5, 6). The positions of the two holding bands (5, 6) with respect to the pinion (24) can be made uniform. Therefore, it is not necessary to take care that the pinion (24) is always located at the center between the two holding bands (5, 6) during assembly, and the assembling work of the distance adjusting mechanism (M) can be easily performed. Furthermore, if this size adjustment band (3) is used as the head holding band of the helmet (1), the positions of the two holding bands (5, 6) with respect to the pinion (24) can be made uniform, which is excellent in aesthetics. And the helmet (1) excellent also in the fit to a head can be provided.
まず、本発明の第１実施形態にかかるサイズ調節バンドを取り付けたヘルメットについて図１〜４を参照して説明する。
図１（ａ）に示すヘルメット１において、帽体２の下側に設けられた頭挿入開口部２ａには、頭部の外周に保持される頭保持バンド３（サイズ調節バンド）が取り付けられているとともに、頭部の左右両側で顎に保持される顎保持バンド４が取り付けられている。頭保持バンド３は、図１（ｂ）に示すように、左右両側の保持帯５，６を有している。帽体２の頭挿入開口部２ａの後側で左右両側の保持帯５，６間には図１（ｂ）及び図２に示す間隔調節機構Ｍが配設されている。ちなみに、頭保持バンド３の保持帯５，６や顎保持バンド４の材質については、比較的容易に撓む性質を持っていれば特に限定されるものではないため、樹脂一般を採用することができる。特に、ポリエチレンやポリアセタールやナイロンなどが望ましい。また、ポリエチレンを採用する場合には、高密度ポリエチレンが耐摩耗性及び形状復元性のバランスからみてより望ましい。
First, the helmet which attached the size adjustment band concerning 1st Embodiment of this invention is demonstrated with reference to FIGS.
In the helmet 1 shown in FIG. 1A, a head holding band 3 (size adjustment band) held on the outer periphery of the head is attached to the head insertion opening 2a provided on the lower side of the cap body 2. In addition, a chin holding band 4 that is held on the chin on both the left and right sides of the head is attached. As shown in FIG. 1B, the head holding band 3 has holding bands 5 and 6 on both the left and right sides. A spacing adjusting mechanism M shown in FIGS. 1B and 2 is disposed between the holding bands 5 and 6 on the left and right sides on the rear side of the head insertion opening 2 a of the cap body 2. Incidentally, the material of the holding bands 5 and 6 and the chin holding band 4 of the head holding band 3 is not particularly limited as long as it has a property of being relatively easily bent. it can. In particular, polyethylene, polyacetal, nylon and the like are desirable. When polyethylene is employed, high-density polyethylene is more desirable from the viewpoint of the balance between wear resistance and shape restoration.
この間隔調節機構Ｍを詳述する。
左側の保持帯５に対し連続して一体に形成された左側の可動部７（第一可動部）と、右側の保持帯６に対し連続して一体に形成された右側の可動部８（第二可動部）とには、それぞれ、保持帯５，６の長手方向に沿って長孔９が前後方向Ｘへ貫設されている。それらの可動部７，８の長孔９は、それぞれ、上下方向Ｚで互いに相対向する上縁部９ａ及び下縁部９ｂと、左右方向Ｙで互いに相対向する一端縁部９ｃ（一端部）及び他端縁部９ｄ（他端部）とにより囲まれて細長い環状に形成されている。左側の長孔９において下縁部９ｂに対しほぼ平行に延びる上縁部９ａにはラック１０が一端縁部９ｃと他端縁部９ｄとの間で形成されている。右側の長孔９において上縁部９ａに対しほぼ平行に延びる下縁部９ｂにはラック１１が一端縁部９ｃと他端縁部９ｄとの間で形成されている。
The interval adjusting mechanism M will be described in detail.
The left movable part 7 (first movable part) formed continuously and integrally with the left holding band 5 and the right movable part 8 (first element) formed integrally with the right holding band 6 continuously. In each of the two movable portions, a long hole 9 is provided in the longitudinal direction X along the longitudinal direction of the holding bands 5 and 6. The long holes 9 of the movable portions 7 and 8 are respectively provided with an upper edge portion 9a and a lower edge portion 9b opposite to each other in the vertical direction Z, and one end edge portion 9c (one end portion) opposite to each other in the left-right direction Y. And the other end edge portion 9d (the other end portion). A rack 10 is formed between the one end edge portion 9c and the other end edge portion 9d in the upper edge portion 9a extending substantially parallel to the lower edge portion 9b in the left long hole 9. A rack 11 is formed between the one end edge portion 9c and the other end edge portion 9d at the lower edge portion 9b extending substantially parallel to the upper edge portion 9a in the right long hole 9.
支持部材としてのケース１２は、帽体２の頭挿入開口部２ａ側（前側）に配設された台部材１３と、その台部材１３の外側（後側）に被せられる蓋部材１４とからなる。台部材１３の外側で左右方向Ｙの中央部には筒壁１６で囲まれた円筒状の支持筒部１５が形成されている。筒壁１６の左右両側には左側の可動部７及び右側の可動部８が挿入される開口１６ａが形成されている。図２に示すように、それらの開口１６ａから支持筒部１５内に挿入された左側の可動部７と右側の可動部８とは前後方向Ｘで互いに重合して並ぶ。支持筒部１５内にはそれらの可動部７，８より後方で係止歯１７が円周方向全体に形成されている。また、蓋部材１４には支持筒部１５が嵌め込まれる円形状の窓孔１８が形成されている。 The case 12 as a support member includes a base member 13 disposed on the head insertion opening 2 a side (front side) of the cap body 2 and a lid member 14 that covers the outside (rear side) of the base member 13. . A cylindrical support cylinder 15 surrounded by a cylinder wall 16 is formed at the center in the left-right direction Y outside the base member 13. Openings 16 a into which the left movable portion 7 and the right movable portion 8 are inserted are formed on the left and right sides of the cylindrical wall 16. As shown in FIG. 2, the left movable portion 7 and the right movable portion 8 inserted into the support cylinder portion 15 through the openings 16 a are overlapped and arranged in the front-rear direction X. Locking teeth 17 are formed in the support cylinder portion 15 in the entire circumferential direction behind the movable portions 7 and 8. The lid member 14 is formed with a circular window hole 18 into which the support cylinder portion 15 is fitted.
摘み１９の内側（前側）には中心軸２０の外周で４個の係止突起２１，２２が周方向へ９０度の等間隔で配設されている。ピニオン２４と係止板２５とが一体に形成された回転部材２３の中心孔２６が摘み１９の内側で中心軸２０に挿嵌されている。図１（ｄ）に示すように、係止板２５には中心孔２６の外周で４個の係止孔２７，２８が周方向へ９０度の等間隔で配設されている。摘み１９の各係止突起２１，２２はそれぞれ係止板２５の各係止孔２７，２８に係入されている。各係止孔２７，２８のうち１８０度の間隔の両係止孔２８が切り欠かれて弾性を有する片持ち梁状の係止腕２９が形成され、その両係止腕２９の外周には爪部３０が形成されている。摘み１９に支持された回転部材２３は蓋部材１４の窓孔１８から支持筒部１５内に挿入され、回転部材２３のピニオン２４が左側の可動部７の長孔９及び右側の可動部８の長孔９に嵌め込まれてそれらのラック１０，１１に噛み合っているとともに、回転部材２３の係止板２５が支持筒部１５の内側に嵌め込まれて両係止腕２９の爪部３０が係止歯１７に係止可能に面している。摘み１９は蓋部材１４に対し窓孔１８を塞ぐように回転可能に支持されている。なお、ピニオン２４の材質については、樹脂一般を採用することができる。特に、前述した頭保持バンド３の保持帯５，６の材質と同等かそれ以上の剛性を持ち、耐摩耗性に優れていることが必要なことから、ポリアセタールやナイロンなどが望ましい。 On the inner side (front side) of the knob 19, four locking projections 21 and 22 are arranged at equal intervals of 90 degrees in the circumferential direction on the outer periphery of the central shaft 20. A central hole 26 of the rotating member 23 in which the pinion 24 and the locking plate 25 are integrally formed is inserted into the central shaft 20 inside the knob 19. As shown in FIG. 1D, the locking plate 25 is provided with four locking holes 27 and 28 on the outer periphery of the center hole 26 at equal intervals of 90 degrees in the circumferential direction. The locking projections 21 and 22 of the knob 19 are engaged with the locking holes 27 and 28 of the locking plate 25, respectively. Both the locking holes 27, 28 are cut out at 180 ° intervals to form an elastic cantilevered locking arm 29, and the outer periphery of both the locking arms 29 is formed. A claw portion 30 is formed. The rotary member 23 supported by the knob 19 is inserted into the support cylinder portion 15 through the window hole 18 of the lid member 14, and the pinion 24 of the rotary member 23 is inserted into the long hole 9 of the left movable portion 7 and the right movable portion 8. While being fitted into the long holes 9 and meshing with the racks 10 and 11, the locking plate 25 of the rotating member 23 is fitted inside the support cylinder 15 and the claws 30 of both locking arms 29 are locked. It faces the teeth 17 so that it can be locked. The knob 19 is rotatably supported so as to close the window hole 18 with respect to the lid member 14. In addition, about the material of the pinion 24, resin general can be employ | adopted. In particular, polyacetal or nylon is desirable because it needs to have rigidity equal to or higher than the material of the holding bands 5 and 6 of the head holding band 3 described above and excellent wear resistance.
図１（ｄ）に示すように爪部３０が係止歯１７に係止されている回り止め状態で、摘み１９を右向きＲに回転させることができる。摘み１９を右向きＲに回転させると、摘み１９の係止突起２１が係止板２５を押して回転部材２３もピニオン２４とともに右向きＲに回転する。従って、左側の可動部７と右側の可動部８とがラック１０，１１を介して互いに移動するため、左側の保持帯５と右側の保持帯６とが互いに接近する向きに移動して両保持帯５，６の間隔を狭くするように調節することができる。 As shown in FIG. 1 (d), the knob 19 can be rotated to the right R while the claw portion 30 is locked to the locking teeth 17. When the knob 19 is rotated in the right direction R, the locking protrusion 21 of the knob 19 pushes the locking plate 25 and the rotating member 23 is rotated in the right direction R together with the pinion 24. Accordingly, since the left movable portion 7 and the right movable portion 8 move relative to each other via the racks 10 and 11, the left holding band 5 and the right holding band 6 move toward each other to hold both. It is possible to adjust the distance between the bands 5 and 6 to be narrow.
図１（ｄ）に示すように爪部３０が係止歯１７に係止されている回り止め状態で、摘み１９を左向きＬに回転させると、図１（ｅ）に示すように摘み１９の係止突起２２が係止腕２９を押して、係止歯１７に対する爪部３０の係止を解除するとともに、摘み１９の係止突起２１，２２が係止板２５を押して回転部材２３もピニオン２４とともに左向きＬに回転する。従って、左側の可動部７と右側の可動部８とがラック１０，１１を介して互いに移動するため、左側の保持帯５と右側の保持帯６とが互いに離間する向きに移動して両保持帯５，６の間隔を広くするように調節することができる。 When the knob 19 is rotated leftward L with the claw portion 30 locked to the locking teeth 17 as shown in FIG. 1 (d), the knob 19 is turned as shown in FIG. 1 (e). The locking projection 22 pushes the locking arm 29 to release the locking of the claw portion 30 with respect to the locking tooth 17, and the locking projections 21 and 22 of the knob 19 press the locking plate 25, and the rotating member 23 is also a pinion 24. At the same time, it rotates to the left L. Accordingly, since the left movable part 7 and the right movable part 8 move relative to each other via the racks 10 and 11, the left holding band 5 and the right holding band 6 move away from each other. It can be adjusted to widen the interval between the bands 5 and 6.
図３（ａ）（ｂ）に示すように、左側のラック１０及び右側のラック１１において、長孔９の一端縁部９ｃに隣接して互いに並ぶ二本の端歯部３１，３２の全歯たけＨ３１，Ｈ３２と、長孔９の他端縁部９ｄに隣接して互いに並ぶ二本の端歯部３１，３２の全歯たけＨ３１，Ｈ３２とは、一端縁部９ｃ側の両端歯部３１，３２と他端縁部９ｄ側の両端歯部３１，３２との間の複数本の中間歯部３３の全歯たけＨ３３より小さく設定されている。しかも、これらの両端歯部３１，３２における全歯たけＨ３１，Ｈ３２は中間歯部３３側から一端縁部９ｃ側または他端縁部９ｄ側に向うに従い次第に小さく設定され、最端歯部３１の全歯たけＨ３１がそれに並ぶ端歯部３２の全歯たけＨ３２より小さく設定されている。また、これらの両端歯部３１，３２は、それぞれ、歯厚方向の両側の噛合面のうち、図３（ａ）（ｂ）に示す最離間状態Ｐにおけるピニオン２４の回転向きＬに対向する片側の噛合面、または、図４（ａ）（ｂ）に示す最接近状態Ｑにおけるピニオン２４の回転向きＲに対向する片側の噛合面に、ピニオン２４の回転向きＬ，Ｒ側へ傾く逃げ面３１ａ，３２ａを有している。左側の可動部７及び右側の可動部８の移動方向Ｙに対する逃げ面３１ａ，３２ａの傾斜角度θ３１，θ３２は、中間歯部３３側から一端縁部９ｃ側または他端縁部９ｄ側に向うに従い次第に小さく設定され、最端歯部３１の逃げ面３１ａの傾斜角度θ３１がそれに並ぶ端歯部３２の逃げ面３２ａの傾斜角度θ３２より小さく設定されている。 As shown in FIGS. 3A and 3B, in the left rack 10 and the right rack 11, all teeth of the two end tooth portions 31 and 32 that are adjacent to each other adjacent to the one end edge portion 9c of the long hole 9 are arranged. Take H31, H32 and all tooth take H31, H32 of two end tooth portions 31, 32 arranged adjacent to each other adjacent to the other end edge portion 9d of the long hole 9 are both end tooth portions 31 on the one end edge portion 9c side. , 32 and both end tooth portions 31, 32 on the other end edge portion 9 d side are set to be smaller than the total tooth clearance H 33 of the plurality of intermediate tooth portions 33. In addition, all tooth gaps H31 and H32 in the both end tooth portions 31 and 32 are set to be gradually smaller from the intermediate tooth portion 33 side toward the one end edge portion 9c side or the other end edge portion 9d side. The total tooth depth H31 is set smaller than the total tooth depth H32 of the end tooth portion 32 aligned therewith. Moreover, these both-ends tooth parts 31 and 32 are respectively one side which opposes the rotation direction L of the pinion 24 in the most separated state P shown to Fig.3 (a) (b) among the meshing surfaces of both sides of a tooth thickness direction. 4a or the flank 31a inclined to the rotation direction L, R side of the pinion 24 on one side of the engagement surface facing the rotation direction R of the pinion 24 in the closest state Q shown in FIGS. , 32a. The inclination angles θ31, θ32 of the flank surfaces 31a, 32a with respect to the moving direction Y of the left movable portion 7 and the right movable portion 8 increase from the intermediate tooth portion 33 side toward the one end edge portion 9c side or the other end edge portion 9d side. The inclination angle θ31 of the flank 31a of the end tooth portion 31 is set to be gradually smaller than the inclination angle θ32 of the flank 32a of the end tooth portion 32 aligned therewith.
左側の可動部７における長孔９の一端縁部９ｃ及び他端縁部９ｄと、右側の可動部８における長孔９の一端縁部９ｃ及び他端縁部９ｄとには、それぞれ、撓み許容孔３４により形成された両持ち梁状ばね３５（弾性部）がラック１０，１１の両端歯部３１，３２に隣接して配設されている。両持ち梁状ばね３５は、ラック１０，１１の両端歯部３１，３２に隣接する中間位置から、そのラック１０，１１の中間歯部３３に隣接する端位置と、左側のラック１０と右側のラック１１との間の長孔９（ピニオン相対移動溝）に対しピニオン２４の相対移動方向Ｙで隣接する端位置とにわたり延設されている。 One end edge portion 9c and the other end edge portion 9d of the long hole 9 in the left movable portion 7 and one end edge portion 9c and the other end edge portion 9d of the long hole 9 in the right movable portion 8 are allowed to bend, respectively. A double-supported beam-like spring 35 (elastic portion) formed by the hole 34 is disposed adjacent to both end tooth portions 31 and 32 of the racks 10 and 11. The double-supported beam-like spring 35 is moved from an intermediate position adjacent to both end tooth portions 31 and 32 of the racks 10 and 11 to an end position adjacent to the intermediate tooth portion 33 of the racks 10 and 11, the left rack 10 and the right rack 10. The long hole 9 (pinion relative movement groove) between the rack 11 and the end position adjacent to the pinion 24 in the relative movement direction Y extends.
ちなみに、ピニオン２４とラック１０，１１との噛合代を少なくした方が、ピニオン２４がラック１０，１１に対してよりスムーズに空回りするため、端歯部３１，３２の全歯たけＨ３１，Ｈ３２は中間歯部３３の全歯たけＨ３３より小さいことが好ましいが、一方、ピニオン２４を逆回転させた際に、ピニオン２４が端歯部３１，３２に確実に噛合するためには、適切な全歯たけＨ３１，Ｈ３２を端歯部３１，３２に設定する必要がある。また、ラック１０，１１の端歯部３１，３２においてピニオン２４が噛合する逃げ面３１ａ，３２ａの傾斜角度θ３１，θ３２を緩やかにした方が、ピニオン２４がラック１０，１１に対してよりスムーズに空回りするため、その逃げ面３１ａ，３２ａの傾斜角度θ３１，θ３２を緩やかにした方が好ましい。一方、ピニオン２４を逆回転させた際に、ピニオン２４が端歯部３１，３２に確実に噛合するためには、ピニオン２４が噛合する端歯部３１，３２の逃げ面３１ａ，３２ａの傾斜角度θ３１，θ３２は、中間歯部３３と同じ傾斜角度に設定する必要がある。具体的には、Ｈ３１（≦Ｈ３２）＝０．５〜０．７×Ｈ３３、θ３１（≦θ３２）＝２５〜３５°、Ｈ３２（≧Ｈ３１）＝０．７〜０．９×Ｈ３３、θ３２（≧θ３１）＝３５〜４５°に設定することが好ましい。なお、両持ち梁状ばね３５の長手方向に沿う撓み許容孔３４の長手方向距離については、両持ち梁状ばね３５が確実に撓み、ピニオン２４に対する回転力を解除した際に確実に復元するように、端歯部３１，３２の歯底から撓み許容孔３４までの距離の８〜１３倍に設定し、最端歯部３１は撓み許容孔３４の長手方向中央位置に配置し、撓み許容孔３４の端位置は中間歯部３３の真下まで達していることが好ましい。また、撓み許容孔３４の幅方向距離≧Ｈ３１に設定することが好ましい。 Incidentally, when the pinion 24 and the racks 10 and 11 have a small engagement allowance, the pinion 24 rotates more smoothly with respect to the racks 10 and 11, so It is preferable that the intermediate tooth portion 33 is smaller than the total tooth depth H33. On the other hand, when the pinion 24 is rotated in the reverse direction, in order for the pinion 24 to reliably mesh with the end tooth portions 31 and 32, an appropriate full tooth It is necessary to set bamboo H31 and H32 to the end tooth portions 31 and 32. In addition, the pinion 24 is more smoothly with respect to the racks 10 and 11 when the inclination angles θ31 and θ32 of the relief surfaces 31a and 32a with which the pinions 24 mesh with each other at the end tooth portions 31 and 32 of the racks 10 and 11 are made gentle. In order to run idle, it is preferable to make the inclination angles θ31 and θ32 of the flank surfaces 31a and 32a gentle. On the other hand, in order to ensure that the pinion 24 meshes with the end teeth 31 and 32 when the pinion 24 is rotated in the reverse direction, the inclination angles of the relief surfaces 31a and 32a of the end teeth 31 and 32 with which the pinion 24 meshes. θ31 and θ32 need to be set to the same inclination angle as that of the intermediate tooth portion 33. Specifically, H31 (≦ H32) = 0.5 to 0.7 × H33, θ31 (≦ θ32) = 25 to 35 °, H32 (≧ H31) = 0.7 to 0.9 × H33, θ32 ( It is preferable to set ≧ θ31) = 35 to 45 °. It should be noted that the longitudinal distance of the bending allowance hole 34 along the longitudinal direction of the both-end beam-like spring 35 is surely restored when the both-end beam-like spring 35 is reliably bent and the rotational force on the pinion 24 is released. In addition, the distance from the bottom of the end tooth portions 31 and 32 to the allowable bending hole 34 is set to 8 to 13 times, and the endmost tooth portion 31 is arranged at the center in the longitudinal direction of the allowable bending hole 34 to allow the allowable bending hole. It is preferable that the end position of 34 reaches just below the intermediate tooth portion 33. Further, it is preferable to set the distance in the width direction of the bending allowance hole ≧ H31.
次に、この間隔調節機構Ｍの作用について説明する。
図３（ａ）（ｂ）に示すように、左側の保持帯５と右側の保持帯６とが最離間した状態Ｐでは、ピニオン２４がこれらの可動部７，８における長孔９の一端縁部９ｃに位置する。その最離間状態Ｐで、摘み１９をさらに左向きＬに回転させると、図３（ｃ）に示すように、ラック１０，１１の一端部側の両端歯部３１，３２に噛み合ったピニオン２４が、両持ち梁状ばね３５の弾性変形に伴う両端歯部３１，３２との噛み合いの解除によりラック１０，１１に対し空回りする。その後、ピニオン２４に対する回転力を解除すると、両持ち梁状ばね３５が変形前の形態に復帰してラック１０，１１がピニオン２４と噛合した状態になる。
Next, the operation of the interval adjusting mechanism M will be described.
As shown in FIGS. 3A and 3B, in the state P in which the left holding band 5 and the right holding band 6 are farthest apart, the pinion 24 has one end edge of the long hole 9 in the movable parts 7 and 8. Located in part 9c. When the knob 19 is further rotated leftward L in the most separated state P, as shown in FIG. 3 (c), the pinions 24 meshed with the both end tooth portions 31, 32 on the one end side of the rack 10, 11 are The racks 10 and 11 are idled by releasing the meshing with the both end tooth portions 31 and 32 due to the elastic deformation of the doubly supported beam spring 35. Thereafter, when the rotational force with respect to the pinion 24 is released, the double-supported beam-like spring 35 returns to the form before deformation, and the racks 10 and 11 are engaged with the pinion 24.
図４（ａ）（ｂ）に示すように、左側の保持帯５と右側の保持帯６とが最接近した状態Ｑでは、ピニオン２４がこれらの可動部７，８における長孔９の他端縁部９ｄに位置する。その最接近状態Ｑで、摘み１９をさらに右向きＲに回転させると、図４（ｃ）に示すように、ラック１０，１１の他端部側の両端歯部３１，３２に噛み合ったピニオン２４が、両持ち梁状ばね３５の弾性変形に伴う両端歯部３１，３２との噛み合いの解除によりラック１０，１１に対し空回りする。その後、ピニオン２４に対する回転力を解除すると、両持ち梁状ばね３５が変形前の形態に復帰してラック１０，１１がピニオン２４と噛合した状態になる。 As shown in FIGS. 4A and 4B, in the state Q in which the left holding band 5 and the right holding band 6 are closest, the pinion 24 is the other end of the long hole 9 in the movable parts 7 and 8. Located at the edge 9d. When the knob 19 is further rotated to the right R in the closest state Q, as shown in FIG. 4C, the pinions 24 meshed with the both end teeth 31 and 32 on the other end side of the racks 10 and 11 are formed. The racks 10 and 11 are idled by releasing the meshing with the both end tooth portions 31 and 32 accompanying the elastic deformation of the both-end supported beam spring 35. Thereafter, when the rotational force with respect to the pinion 24 is released, the double-supported beam-like spring 35 returns to the form before deformation, and the racks 10 and 11 are engaged with the pinion 24.
ちなみに、左右両保持帯５，６がピニオン２４に対し左右不均等に組立ててあると、ピニオン２４に対し一方の保持帯５の端部(左右両可動部７，８の一端縁部９ｃまたは他端縁部９ｄ)が到達するタイミングと他方の保持帯６の端部(左右両可動部７，８の一端縁部９ｃまたは他端縁部９ｄ)が到達するタイミングとが互いにずれるが、左右両保持帯５，６の端部(一端縁部９ｃまたは他端縁部９ｄ)のうちピニオン２４に対し先に到達した端部でピニオン２４が空回りを続けているうちに、別の端部がピニオン２４に到達するため、左右両保持帯５，６がピニオン２４に対し左右均等に組付けられた状態になる。その後は、ピニオン２４を左右のどちらに回転させても、その状態は保持される。よって、ピニオン２４に対する左右両保持帯５，６の位置関係がずれて組み立てられたとしても、ピニオン２４を一度空回りさせることにより、ピニオン２４に対する左右両保持帯５，６の位置を左右均等とすることができる。 Incidentally, if the left and right holding bands 5 and 6 are assembled to the pinion 24 unevenly on the left and right, the end of one holding band 5 with respect to the pinion 24 (one edge 9c of the left and right movable parts 7 and 8 or other The timing at which the end edge portion 9d) arrives and the timing at which the end portion of the other holding band 6 (one end edge portion 9c or the other end edge portion 9d of the left and right movable portions 7, 8) arrives are different from each other. While the pinion 24 continues to idle at the end of the holding band 5, 6 (one end edge 9 c or the other end edge 9 d) that has reached the pinion 24 first, the other end is the pinion 24, the left and right holding bands 5 and 6 are assembled to the pinion 24 equally. Thereafter, the state is maintained even if the pinion 24 is rotated to the left or right. Therefore, even if the positional relationship between the left and right holding bands 5, 6 with respect to the pinion 24 is shifted and assembled, the positions of the left and right holding bands 5, 6 with respect to the pinion 24 are made equal evenly by rotating the pinion 24 once. be able to.
次に、図５〜６に示す第２実施形態にかかるサイズ調節バンドを取り付けたヘルメットについては、両持ち梁状ばね３５及び撓み許容孔３４を変更した点で、第１実施形態と主に下記のように異なる。両持ち梁状ばね３５及び撓み許容孔３４は、左側の可動部７及び右側の可動部８の一端縁部９ｃ、並びに、左側の可動部７及び右側の可動部８の他端縁部９ｄでそれぞれ、左側のラック１０と右側のラック１１との間の長孔９に対しピニオン２４の相対移動方向（左右方向Ｙ）で隣接して配設されて、左側のラック１０の端歯部３１及び右側のラック１１の端歯部３１に隣接する位置から下縁部９ｂまたは上縁部９ａまで延設されている。ちなみに、ピニオン２４とラック１０，１１との噛合代を少なくした方が、ピニオン２４がラック１０，１１に対してよりスムーズに空回りするため、最端歯部３１の全歯たけＨ３１は中間歯部３３の全歯たけＨ３３より小さいことが好ましいが、一方、ピニオン２４を逆回転させた際に、ピニオン２４が最端歯部３１に確実に噛合するためには、適切な全歯たけＨ３１を最端歯部３１に設定する必要がある。また、ラック１０，１１の最端歯部３１においてピニオン２４が噛合する逃げ面３１ａの傾斜角度θ３１を緩やかにした方が、ピニオン２４がラック１０，１１に対してよりスムーズに空回りするため、その逃げ面３１ａの傾斜角度θ３１を緩やかにした方が好ましい。一方、ピニオン２４を逆回転させた際に、ピニオン２４が最端歯部３１に確実に噛合するためには、ピニオン２４が噛合する最端歯部３１の逃げ面３１ａの傾斜角度θ３１は、中間歯部３３と同じ傾斜角度に設定する必要がある。具体的には、Ｈ３１＝０．７〜０．９×Ｈ３３、θ３１＝３５〜４５°に設定することが好ましい。なお、両持ち梁状ばね３５の長手方向に沿う撓み許容孔３４の長手方向距離については、両持ち梁状ばね３５が確実に撓み、ピニオン２４に対する回転力を解除した際に確実に復元するように、両持ち梁状ばね３５の幅方向距離の８〜１３倍に設定し、また、ピニオン２４が空回りする状態まで両持ち梁状ばね３５が撓むためには、撓み許容孔３４の幅方向距離は端歯部３１の歯元の歯厚方向距離と端歯部３１に隣接する歯底の歯厚方向距離との和の０．５倍以上に設定することが好ましい。 Next, with respect to the helmet to which the size adjustment band according to the second embodiment shown in FIGS. 5 to 6 is attached, the following is mainly the same as the first embodiment in that the double-supported beam-like spring 35 and the bending allowance hole 34 are changed. Different. The doubly-supported beam-like spring 35 and the bending allowance hole 34 are provided at one end edge portion 9c of the left movable portion 7 and the right movable portion 8, and the other end edge portion 9d of the left movable portion 7 and the right movable portion 8. Respectively disposed in the relative movement direction (left-right direction Y) of the pinion 24 with respect to the long hole 9 between the left rack 10 and the right rack 11, the end teeth 31 of the left rack 10 and It extends from the position adjacent to the end tooth portion 31 of the right rack 11 to the lower edge portion 9b or the upper edge portion 9a. Incidentally, since the pinion 24 rotates more smoothly with respect to the racks 10 and 11 when the engagement margin between the pinion 24 and the racks 10 and 11 is reduced, the entire tooth gap H31 of the outermost tooth portion 31 is an intermediate tooth portion. However, in order to ensure that the pinion 24 meshes with the endmost tooth portion 31 when the pinion 24 is rotated in the reverse direction, an appropriate full tooth depth H31 is set to the maximum. It is necessary to set the end tooth portion 31. In addition, when the inclination angle θ31 of the flank 31a with which the pinion 24 meshes at the most end teeth 31 of the racks 10 and 11 is made gentle, the pinion 24 idles more smoothly with respect to the racks 10 and 11, It is preferable to make the inclination angle θ31 of the flank 31a gentle. On the other hand, in order to ensure that the pinion 24 meshes with the outermost tooth portion 31 when the pinion 24 is reversely rotated, the inclination angle θ31 of the flank 31a of the outermost tooth portion 31 with which the pinion 24 meshes is It is necessary to set the same inclination angle as that of the tooth portion 33. Specifically, it is preferable to set H31 = 0.7 to 0.9 × H33 and θ31 = 35 to 45 °. It should be noted that the longitudinal distance of the bending allowance hole 34 along the longitudinal direction of the both-end beam-like spring 35 is surely restored when the both-end beam-like spring 35 is reliably bent and the rotational force on the pinion 24 is released. In addition, in order for the cantilever beam spring 35 to be bent until the pinion 24 is idled, the width direction distance of the bending allowance hole 34 is set to be 8 to 13 times the width direction distance of the cantilever beam spring 35. It is preferable to set to 0.5 times or more of the sum of the tooth thickness direction distance of the tooth base of the end tooth portion 31 and the tooth thickness direction distance of the tooth bottom adjacent to the end tooth portion 31.
また、図７〜８に示す第３実施形態にかかるサイズ調節バンドを取り付けたヘルメットについては、撓み許容孔３４の幅方向距離を大きくして撓み易くした点で、第２実施形態と主に異なる。 Moreover, about the helmet which attached the size adjustment band concerning 3rd Embodiment shown in FIGS. 7-8, it differs mainly from 2nd Embodiment by the point which made the width direction distance of the bending | flexion permissible hole 34 large, and was made easy to bend. .
本実施形態は下記の効果を有する。
（１） 第１実施形態にかかるヘルメット１の頭保持バンド３の間隔調節機構Ｍにおいて、ラック１０，１１の端歯部３１，３２の全歯たけＨ３１，Ｈ３２をその端歯部３１，３２以外の中間歯部３３の全歯たけＨ３３より小さく設定したので、頭保持バンド３の左右両保持帯５，６の最接近状態Ｑまたは最離間状態Ｐで、ピニオン２４に必要以上の回転力が加わると、ピニオン２４を両持ち梁状ばね３５の弾性変形に伴いラック１０，１１に対し空回りさせることができる。また、その端歯部３１，３２は、それぞれ、逃げ面３１ａ，３２ａを有しているので、ラック１０，１１の端歯部３１，３２とピニオン２４との噛み合いをより一層容易に解除させてピニオン２４を空回りさせることができる。従って、ラック１０，１１とピニオン２４との間の噛合部の欠損を防止することができる。なお、一本の最端歯部３１のみを有する第２〜３実施形態も、第１実施形態と同様に、ピニオン２４を両持ち梁状ばね３５の弾性変形に伴いラック１０，１１に対し空回りさせて、ラック１０，１１とピニオン２４との間の噛合部の欠損を防止することができる。
This embodiment has the following effects.
(1) In the distance adjusting mechanism M of the head holding band 3 of the helmet 1 according to the first embodiment, all the tooth depths H31 and H32 of the end teeth 31 and 32 of the racks 10 and 11 are other than the end teeth 31 and 32. The intermediate tooth portion 33 is set to be smaller than the total tooth depth H33, so that an excessive rotational force is applied to the pinion 24 when the left and right holding bands 5 and 6 of the head holding band 3 are in the closest state Q or the most separated state P. Then, the pinion 24 can be idled with respect to the racks 10 and 11 in accordance with the elastic deformation of the double-supported beam-like spring 35. Further, since the end tooth portions 31 and 32 have flank surfaces 31a and 32a, respectively, the engagement between the end tooth portions 31 and 32 of the racks 10 and 11 and the pinion 24 is more easily released. The pinion 24 can be idled. Accordingly, it is possible to prevent the meshing portion between the racks 10 and 11 and the pinion 24 from being lost. In the second to third embodiments having only one end tooth portion 31, as in the first embodiment, the pinion 24 is idled with respect to the racks 10 and 11 due to the elastic deformation of the double-supported beam spring 35. Thus, the meshing portion between the racks 10 and 11 and the pinion 24 can be prevented from being lost.
（２） 第１実施形態において、端歯部３１，３２の全歯たけＨ３１，Ｈ３２は、中間歯部３３側から最端歯部３１側に向うに従い次第に中間歯部３３の全歯たけＨ３３より小さく設定されているとともに、端歯部３１，３２の逃げ面３１ａ，３２ａの傾斜角度θ３１，θ３２は、中間歯部３３側から最端歯部３１側に向うに従い次第に小さく設定されている。従って、ラック１０，１１の端歯部３１，３２とピニオン２４との噛み合いをより一層容易に解除させてピニオン２４を空回りさせることができる。なお、一本の最端歯部３１のみを有する第２〜３実施形態も、第１実施形態と同様に、ラック１０，１１の最端歯部３１とピニオン２４との噛み合いをより一層容易に解除させてピニオン２４を空回りさせることができる。 (2) In the first embodiment, the full tooth lengths H31 and H32 of the end tooth portions 31 and 32 are gradually more than the full tooth length H33 of the intermediate tooth portion 33 from the intermediate tooth portion 33 side toward the endmost tooth portion 31 side. The inclination angles θ31 and θ32 of the flank surfaces 31a and 32a of the end tooth portions 31 and 32 are gradually set smaller from the intermediate tooth portion 33 side toward the end tooth portion 31 side. Therefore, the engagement between the end teeth 31 and 32 of the racks 10 and 11 and the pinion 24 can be released more easily, and the pinion 24 can be idled. Note that the second to third embodiments having only one outermost tooth portion 31 also make it easier to engage the outermost tooth portion 31 of the racks 10 and 11 and the pinion 24 as in the first embodiment. The pinion 24 can be idled by being released.
（３） 第１〜３実施形態にかかるヘルメット１の頭保持バンド３の間隔調節機構Ｍにおいて、左右両保持帯５，６の最接近状態Ｑまたは最離間状態Ｐでピニオン２４を空回りさせた後に、ピニオン２４に対する回転力を解除すると、ラック１０，１１が両持ち梁状ばね３５の変形前の形態に復帰してピニオン２４と噛合した状態になる。そのため、ラック１０，１１とピニオン２４とを一旦組み立てた後に、左右両保持帯５，６の最接近状態Ｑまたは最離間状態Ｐでピニオン２４を空回りさせ、その後、ピニオン２４を逆方向に回転させれば、ピニオン２４に対する左右両保持帯５，６の位置を左右均等とすることができる。従って、組み立て時にピニオン２４が左右両保持帯５，６間の中央に常に位置するように注意する必要がなくなり、間隔調節機構Ｍの組立作業を容易に行うことができる。 (3) In the distance adjustment mechanism M of the head holding band 3 of the helmet 1 according to the first to third embodiments, after the pinion 24 is idled in the closest approach state Q or the most separated state P of the left and right holding bands 5 and 6. When the rotational force with respect to the pinion 24 is released, the racks 10 and 11 return to the form before the deformation of the double-supported beam-like spring 35 and mesh with the pinion 24. Therefore, after assembling the racks 10 and 11 and the pinion 24 once, the left and right holding belts 5 and 6 are rotated in the closest state Q or the most separated state P, and then the pinion 24 is rotated in the reverse direction. Then, the positions of the left and right holding bands 5 and 6 with respect to the pinion 24 can be made equal to the left and right. Therefore, it is not necessary to pay attention so that the pinion 24 is always located at the center between the left and right holding bands 5 and 6 at the time of assembly, and the assembling work of the interval adjusting mechanism M can be easily performed.
（４） 第１〜３実施形態において、ピニオン２４の空回りを許容する弾性部を両持ち梁状ばね３５としたので、弾性部を容易に形成することができる。
前記実施形態以外にも例えば下記のように構成してもよい。
(4) In the first to third embodiments, since the elastic portion that allows the pinion 24 to rotate freely is the double-supported beam-like spring 35, the elastic portion can be easily formed.
For example, the following embodiment may be configured as follows.
・ 第１〜３実施形態において、第一可動部７及び第二可動部８の一端縁部９ｃ側に設けた両持ち梁状ばね３５を省略するとともに、第一可動部７及び第二可動部８の一端縁部９ｃ側に設けた端歯部３１，３２における全歯たけＨ３１，Ｈ３２をその端歯部３１，３２以外の中間歯部３３の全歯たけＨ３３と同一にしてもよい。従って、最離間状態Ｐでラック１０，１１の一端縁部９ｃ側の端歯部３１，３２に噛み合ったピニオン２４は空回りせず、最接近状態Ｑでラック１０，１１の他端縁部９ｄ側の端歯部３１，３２に噛み合ったピニオン２４のみが、両持ち梁状ばね３５の弾性変形に伴う端歯部３１，３２との噛み合いの解除によりラック１０，１１に対し空回りし得るようにしてもよい。 -In 1st-3rd embodiment, while omitting the cantilever beam-like spring 35 provided in the one end edge part 9c side of the 1st movable part 7 and the 2nd movable part 8, the 1st movable part 7 and the 2nd movable part 8 may be the same as the full tooth depth H33 of the intermediate tooth portion 33 other than the end tooth portions 31 and 32. Therefore, the pinion 24 meshed with the end teeth 31 and 32 on the one end edge 9c side of the racks 10 and 11 in the most separated state P does not rotate freely, and the other end edge 9d side of the racks 10 and 11 in the closest state Q. Only the pinion 24 meshed with the end tooth portions 31 and 32 can be idled with respect to the racks 10 and 11 by releasing the mesh with the end tooth portions 31 and 32 due to the elastic deformation of the double-supported beam spring 35. Also good.
・ 第１〜３実施形態において、弾性部としては両持ち梁状ばね３５以外に片持ち梁状ばねを採用してもよい。
・ 第１実施形態において、逃げ面３１ａ，３２ａを省略してもよい。また、第２〜３実施形態において、逃げ面３１ａを省略してもよい。
-In 1st-3rd embodiment, you may employ | adopt a cantilever-like spring other than the both-ends cantilever spring 35 as an elastic part.
In the first embodiment, the flank surfaces 31a and 32a may be omitted. In the second to third embodiments, the flank 31a may be omitted.
・ 第１実施形態において、端歯部３１，３２の全歯たけＨ３１，Ｈ３２を互いに同一にしてもよい。
・ 第１実施形態において、端歯部３１，３２の逃げ面３１ａ，３２ａの傾斜角度θ３１，θ３２を互いに同一にしてもよい。
-In 1st Embodiment, you may make mutually the same teeth H31 and H32 of the end tooth parts 31 and 32 mutually.
In the first embodiment, the inclination angles θ31 and θ32 of the flank surfaces 31a and 32a of the end tooth portions 31 and 32 may be the same.
・ 第１実施形態において、端歯部３１，３２の全歯たけと中間歯部３３の全歯たけとを同一にし、端歯部３１，３２にのみ逃げ面３１ａ，３２ａを設けてもよい。また、第２〜３実施形態において、最端歯部３１の全歯たけと中間歯部３３の全歯たけとを同一にし、最端歯部３１にのみ逃げ面３１ａを設けてもよい。 In the first embodiment, it is also possible to make the entire teeth of the end teeth 31 and 32 and the entire teeth of the intermediate teeth 33 the same, and provide the flank surfaces 31a and 32a only on the end teeth 31 and 32. Moreover, in 2nd-3rd embodiment, all the toothpastes of the most end tooth part 31 and all the toothpastes of the intermediate | middle tooth part 33 may be made the same, and the flank 31a may be provided only in the most end tooth part 31. FIG.
・ 第１実施形態において複数の端歯部として二本以外に三本以上設けてもよい。
・ ヘルメット１以外の各種の用途にサイズ調節バンドを採用することができる。
-In 1st Embodiment, you may provide three or more as a some edge part other than two.
-Size adjustment bands can be used for various purposes other than helmet 1.
Ｍ…間隔調節機構、１…ヘルメット、２…帽体、２ａ…頭挿入開口部、３…頭保持バンド（サイズ調節バンド）、５，６…保持帯、７，８…可動部、１０，１１…ラック、１３…台部材（支持部材）、１４…蓋部材（支持部材）、２４…ピニオン、３１…端歯部（最端歯部）、３１ａ…逃げ面、３２…端歯部、３２ａ…逃げ面、３３…中間歯部、３４…撓み許容孔、３５…両持ち梁状ばね（弾性部）、Ｐ…最離間状態、Ｑ…最接近状態、Ｈ３１，Ｈ３２…端歯部の全歯たけ、Ｈ３３…中間歯部の全歯たけ、θ３１，θ３２…逃げ面の傾斜角度、Ｌ，Ｒ…ピニオンの回転向き、Ｙ…可動部の移動方向。 M ... spacing adjustment mechanism, 1 ... helmet, 2 ... cap body, 2a ... head insertion opening, 3 ... head holding band (size adjustment band), 5, 6 ... holding band, 7, 8 ... movable part, 10, 11 ... Rack, 13 ... Base member (support member), 14 ... Lid member (support member), 24 ... Pinion, 31 ... End tooth part (most end tooth part), 31a ... Flank, 32 ... End tooth part, 32a ... Flank, 33 ... Intermediate tooth part, 34 ... Deflection allowable hole, 35 ... Double-supported spring (elastic part), P ... Most distant state, Q ... Closest state, H31, H32 ... All teeth of end tooth part , H33: All teeth of the intermediate tooth part, θ31, θ32: Inclination angle of the flank, L, R: Direction of rotation of the pinion, Y: Direction of movement of the movable part.
Claims (8)
両保持帯が最離間した最離間状態で互いに並ぶ第一可動部及び第二可動部の一端部と、両保持帯が最接近した最接近状態で互いに並ぶ第一可動部及び第二可動部の他端部とのうち、少なくとも第一可動部及び第二可動部の他端部には、ピニオンを支える弾性部を設け、
第一可動部及び第二可動部のラックにおいて、第一可動部及び第二可動部の移動方向に沿って並設された各歯部で、その移動方向の両側の端に位置する一または複数の端歯部のうち、少なくとも第一可動部及び第二可動部の他端部側の端歯部における全歯たけを、その端歯部以外の中間歯部の全歯たけより小さく設定し、
前記最接近状態でラックの他端部側の端歯部に噛み合ったピニオンが、弾性部の弾性変形に伴う端歯部との噛み合いの解除によりラックに対し空回りし得る
ことを特徴とするサイズ調節バンド。 The first movable part on the one holding band side and the second movable part on the other holding band side of the two holding bands are arranged side by side so that both holding bands can be moved away from each other and closer to each other. A pinion that supports the support member and meshes with the rack provided at the first movable part and the rack provided at the second movable part is rotatably supported by the support member, and the first movable part and the pinion rotate with the support member. In the size adjustment band provided between the two holding bands, an interval adjusting mechanism that allows the second movable part to move relative to each other via the rack to adjust the distance between the two holding bands.
One end of the first movable part and the second movable part that are aligned with each other in the most separated state in which the two holding bands are spaced apart, and the first movable part and the second movable part that are aligned with each other in the closest state where both holding bands are closest to each other. Among the other end portion, at least the other end portion of the first movable portion and the second movable portion is provided with an elastic portion that supports the pinion,
In the rack of the first movable part and the second movable part, one or a plurality of tooth parts arranged in parallel along the movement direction of the first movable part and the second movable part and positioned at both ends in the movement direction Of all the end tooth parts, at least the first tooth of the first movable part and the second tooth part on the other tooth part side of the second movable part is set smaller than the whole tooth tooth of the intermediate tooth part other than the end tooth part,
The size adjustment is characterized in that the pinion meshed with the end tooth portion on the other end side of the rack in the closest state can idle with respect to the rack by releasing the mesh with the end tooth portion due to elastic deformation of the elastic portion. band.
前記第一可動部及び第二可動部の一端部側の端歯部における全歯たけも、その端歯部以外の中間歯部の全歯たけより小さく設定し、
前記最離間状態でラックの一端部側の端歯部に噛み合ったピニオンも、弾性部の弾性変形に伴う端歯部との噛み合いの解除によりラックに対し空回りし得る
ことを特徴とする請求項１に記載のサイズ調節バンド。 An elastic part that supports the pinion is also provided at one end of the first movable part and the second movable part,
The total tooth depth in the end tooth portion on the one end side of the first movable portion and the second movable portion is also set smaller than the total tooth depth of the intermediate tooth portion other than the end tooth portion,
2. The pinion engaged with an end tooth portion on one end portion side of the rack in the most separated state can also be idled with respect to the rack by releasing the engagement with the end tooth portion due to elastic deformation of the elastic portion. Size adjustment band as described in.
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