JP2009137460A

JP2009137460A - Headrest and base material of the same

Info

Publication number: JP2009137460A
Application number: JP2007316348A
Authority: JP
Inventors: Kentaro Kamiya; 健太郎神谷
Original assignee: Inoue MTP KK; Inoac Corp
Current assignee: Inoac Corp
Priority date: 2007-12-06
Filing date: 2007-12-06
Publication date: 2009-06-25
Anticipated expiration: 2027-12-06
Also published as: JP5224326B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headrest and its base material on a core-attached stay, offering safety improved by allowing even the stay having a micro-curved surface to stably and efficiently absorb collision energy. <P>SOLUTION: The base material for the headrest comprises: the stay 2 having an upper-end part 20a of a pair of leg portions 20 connected at a connecting portion 21; the core 3 attached to a top portion 2a of the stay 2 with an energy absorption space 6 kept between a front plate portion 30 and the connecting portion; and an energy absorbing structure 5 with a pair of standing plate portions 51 installed in a standing manner while facing a back face 30b of the front plate portion and connected to each other with a top plate portion 52, wherein the energy absorbing structure 5 is disposed in the space 6 in such a manner that a top face 52a of the top plate portion 52 abuts on or is in proximity to the connecting portion 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は車両等のシートバック上端に装備されるヘッドレスト及びヘッドレスト用基材に関する。 The present invention relates to a headrest and a headrest base material that are mounted on an upper end of a seat back of a vehicle or the like.

自動車などのシートバック上端には、快適さを得るためにヘッドレストが取り付けられている。従来の固定式ヘッドレストでは、例えば特開平９−２７６０７４号,特開平８−６６５７２号公報等にみられるように、袋状表皮内に金属製ステーの上部を配設した後、該表皮内に発泡原料を注入し一体発泡成形させたものが多かった。表皮内の発泡体には金属製ステーだけが埋設されていた。
しかし、近年、快適さだけでなく、車両衝突時における乗員頭部の保護を目的とするヘッドレストがいくつか提案されるにようになってきた（例えば特許文献１）。 A headrest is attached to the upper end of a seat back of an automobile or the like for comfort. In the conventional fixed headrest, as shown in, for example, JP-A-9-276074 and JP-A-8-66572, an upper portion of a metal stay is disposed in a bag-like skin, and then foamed in the skin. Many were injected with raw material and integrally molded. Only the metal stay was embedded in the foam inside the skin.
In recent years, however, several headrests have been proposed that are intended not only for comfort but also for protecting the head of an occupant during a vehicle collision (for example, Patent Document 1).

特開２００６−６８２３公報JP 2006-6823 A

特許文献１等の開示発明は、発泡体内にステー上部しか埋設してなかったそれまでのヘッドレストから、図１２のごとくステー脚部２０の上端部及び連結部２１の前面に芯材ｅを固定して、これらが発泡体ｇ内に埋設されるヘッドレストとする。車両後方から衝突される追突時には、背中に働く力に比べ頭部ＨＤに働く力が遅れてしまうため(図１３のイ)、首が後傾してムチウチになるが、芯材ｅを設けることによってムチウチ防止を図る。従来のヘッドレストＨＲに比べ、芯材ｅを設けたヘッドレストでは頭部ＨＤへの反力が低変位で立ち上がるからである。図１３(ロ)に示すごとく、芯材なしのヘッドレスト(従来品)を用いた場合、首が後傾する変位がβに対し、芯材有りのヘッドレストでは首が後傾する変位がαと短くなり、頭部ＨＤがヘッドレストの接触開始地点Ｇに接触した後、早めに反力が立つことでムチウチ低減を狙えるヘッドレストになる。 In the disclosed invention such as Patent Document 1, the core material e is fixed to the upper end portion of the stay leg portion 20 and the front surface of the connecting portion 21, as shown in FIG. These are the headrests embedded in the foam g. At the time of rear-end collision, the force acting on the head HD is delayed compared to the force acting on the back (a in FIG. 13), so that the neck tilts backward to become a whip but the core e is provided. To prevent whiplash. This is because, in comparison with the conventional headrest HR, in the headrest provided with the core material e, the reaction force to the head HD rises with a low displacement. As shown in FIG. 13 (b), when a headrest without a core material (conventional product) is used, the displacement of the neck tilting backward is β, whereas in the headrest with the core material, the displacement of tilting the neck backward is α, which is short. Thus, after the head HD comes into contact with the contact start point G of the headrest, the reaction force is set up early so that the headrest can be aimed at reducing whiplash.

しかるに、特許文献１等の芯材ｅをステー２に取着したヘッドレストは、次のような問題があった。芯材なしのヘッドレストに比べて、芯材有りのヘッドレストは、ムチウチに対し効果が認められるものの、図１３(ロ)のごとく反発力が急上昇して頭部に働いてしまう状況にあった。芯材ｅは一般に所定厚みを有する硬質の樹脂成形品などで造られており、ステーに取着される該芯材自体に効果的な衝突エネルギ吸収(以下、「ＥＡ」という)させるのは難を極めた。特許文献１等のヘッドレストは、若干のＥＡ特性をもたせることも目標とするが、ステー剛性と芯材自体の強度に頼ったものであるため動作荷重が高く、値も安定しなかった。
ＥＡ材は必ず対象物と大質量且つ大きな面積の剛体との間で機能する。ところが、芯材付きステーのヘッドレストでは、剛体壁に相当する部分がステー２、詳しくはステー上部であり、非常に面積が小さく且つ曲面になっている。細い円柱等からなるステーのごく小さな面積でしかなく、しかも曲面、すなわち「微小曲面」になる。従って、従来の芯材が硬質発泡体だけの場合(図１４のＡ)は、発泡体のＥＡ材が割れてしまい機能しなくなる。
変位−荷重特性(以下、「ＦＳ特性」という)は、図１４(イ)に示す目標特性のような矩形波になるのが理想である。これに対し、発泡体は図１４(イ)のＡのごとく初期は右肩上がりの後、ステーがクサビ状に食い込んでいくため破壊され易い。発泡体とは、ウレタン,ビーズ発泡品等で、内部が微細なセル構造からなる発泡部材を用いたブロック体をいう。他のＥＡ材、例えばリブを設けた構造体ブロックＣを採用しても、図１４(イ),(ロ)に示すごとく、場所によって特性が著しく変化し安定しない。構造体ブロックとは、樹脂又は金属等からなる立体構造で、圧縮方向に対してリブ(縦壁)を配置し、その座屈によってＥＡを行う部材をいう。ステーのような細い円柱の微小曲面にあっては、リブ上にステーが載る場合(図１４のＣ−１)と、リブから外れた所にステーが載る場合(図１４のＣ−２)とでは、図１４(イ)のごとくＦＳ特性が大きく異なる。またゴムやゲルなどの非線形材料をＥＡ材に採用した場合(図１４(イ)のＢ)、荷重の立ち上がりが悪く、さらに右肩上がりで荷重が立ち上がるため、６０％〜７０％程度で高い荷重に達してしまう問題があった。 However, the headrest having the core material e attached to the stay 2 in Patent Document 1 has the following problems. Compared with the headrest without the core material, the headrest with the core material has an effect on the whip, but as shown in FIG. The core material e is generally made of a hard resin molded product having a predetermined thickness, and it is difficult to effectively absorb collision energy (hereinafter referred to as “EA”) to the core material itself attached to the stay. I mastered. The headrest disclosed in Patent Document 1 or the like has a target to have a slight EA characteristic, but because it depends on stay rigidity and the strength of the core material itself, the operation load is high and the value is not stable.
The EA material always functions between an object and a rigid body having a large mass and a large area. However, in the headrest of the stay with the core material, the portion corresponding to the rigid body wall is the stay 2, more specifically, the upper portion of the stay, and the area is very small and curved. It is only a very small area of a stay made of a thin cylinder or the like, and it becomes a curved surface, that is, a “micro curved surface”. Therefore, when the conventional core material is only a hard foam (A in FIG. 14), the EA material of the foam breaks and does not function.
The displacement-load characteristic (hereinafter referred to as “FS characteristic”) is ideally a rectangular wave like the target characteristic shown in FIG. On the other hand, the foam is easy to be broken because the stay bites in a wedge shape after rising to the right at the initial stage as shown in FIG. The foam refers to a block body using a foamed member made of urethane, bead foam or the like and having a fine cell structure inside. Even if another EA material, for example, a structure block C provided with ribs, is employed, the characteristics change remarkably depending on the location as shown in FIGS. The structure block is a three-dimensional structure made of resin, metal, or the like, and refers to a member in which ribs (vertical walls) are arranged in the compression direction and EA is performed by buckling. When the stay is placed on a rib (C-1 in FIG. 14) and the stay is placed on a place removed from the rib (C-2 in FIG. 14) in a thin cylindrical minute curved surface such as a stay. Then, the FS characteristics are greatly different as shown in FIG. In addition, when nonlinear materials such as rubber and gel are used for the EA material (B in FIG. 14 (a)), the load rises badly, and the load rises as the shoulder rises, so a high load of about 60% to 70%. There was a problem that reached.

本発明は、上記問題点を解決するもので、芯材が取着されたステーにあって、その微小曲面のステーに対しても、衝突エネルギを安定且つ効率よく吸収できるようにして安全性を高めたヘッドレスト及びヘッドレスト用基材を提供することを目的とする。 The present invention solves the above-mentioned problems. In the stay to which the core material is attached, the collision energy can be absorbed stably and efficiently even in the stay with the minute curved surface. An object is to provide an enhanced headrest and a headrest base material.

上記目的を達成すべく、請求項１に記載の発明の要旨は、一対の脚部の上端部分が連結部で結合されたステーと、前板部が該連結部との間にエネルギ吸収用空間をとって、ステーの上部に取付けられる芯材と、該前板部の背面に一対の立板部が対向して立設し、両立板部が天板部で連結されたエネルギ吸収構造体と、を具備し、且つ前記連結部に前記天板部の天面が当接又は近接するようにして、該エネルギ吸収構造体が前記空間に配設されることを特徴とするヘッドレスト用基材にある。
請求項２の発明たるヘッドレスト用基材は、請求項１で、連結部の中間部位と前板部間の中央領域は前記エネルギ吸収構造体を配設しないで、該中央領域の両側に前記エネルギ吸収構造体がそれぞれ配設され、さらに該中央領域の前板部背面に起立して、前記連結部に当接する支柱が設けられることを特徴とする。
請求項３の発明たるヘッドレスト用基材は、請求項２で、支柱の先端部分に側面視ほぼＬ字状のフックが設けられ、前記連結部に掛止できるようにしたことを特徴とする。
請求項４の発明は、袋状表皮と、一対の脚部の上端部分が連結部で結合されたステーと、該ステーの上部に取付けられる芯材と、該ステーの上部及び該芯材が配設された前記表皮内に発泡原料を注入し、該表皮、該ステー及び該芯材と一体化させて発泡硬化した発泡体と、を備えるヘッドレストにあって、前記芯材が、その前板部と前記連結部との間にエネルギ吸収用空間をとって、ステーの上部に取付けられる一方、前記前板部の背面に一対の立板部を対向して立設させ、且つ両立板部を天板部で連結したエネルギ吸収構造体が、該天板部の天面を前記連結部に当接又は近接させるようにして前記空間に配設されることを特徴とするヘッドレストにある。
ここで、「前板部と連結部との間に空間をとって、エネルギ吸収構造体が該空間に配設される」が、「該表皮、該ステー及び該芯材と一体化させて発泡硬化した発泡体」の一部が該空間に入り込んでも、本発明のヘッドレストであるとみなす。発泡体に関しては、該空間内に発泡体の一部が侵入しても、衝突エネルギを吸収する本発明と同様の効果が得られるからである。 In order to achieve the above object, the gist of the invention described in claim 1 is that an energy absorbing space is provided between a stay in which upper ends of a pair of leg portions are coupled by a connecting portion and a front plate portion between the connecting portion. A core material attached to the upper portion of the stay, and an energy absorbing structure in which a pair of upright plate portions are erected on the back surface of the front plate portion and the compatible plate portions are connected by the top plate portion; A base material for a headrest, wherein the energy absorbing structure is disposed in the space so that a top surface of the top plate portion is in contact with or close to the connecting portion. is there.
A base material for a headrest according to a second aspect of the present invention is the base material for a headrest according to the first aspect, wherein the energy absorption structure is not disposed in a central region between the intermediate portion of the connecting portion and the front plate portion, and the energy is not provided on both sides of the central region. Each of the absorbent structures is provided, and further, a support column is provided that stands on the back surface of the front plate portion in the central region and comes into contact with the connecting portion.
A base material for a headrest according to a third aspect of the present invention is the base material for a headrest according to the second aspect, characterized in that a hook having a substantially L shape in side view is provided at the tip portion of the support so that it can be hooked on the connecting portion.
According to the invention of claim 4, the bag-shaped skin, the stay in which the upper end portions of the pair of leg portions are coupled by the connecting portion, the core member attached to the upper portion of the stay, the upper portion of the stay and the core member are arranged. A foamed material in which foaming raw material is injected into the provided skin, and foamed and cured by integrating the skin, the stay and the core material, and the core material has a front plate portion An energy absorbing space is provided between the connecting portion and the upper portion of the stay, and a pair of standing plate portions are opposed to the back surface of the front plate portion, and the compatible plate portion is mounted on the ceiling. The energy absorbing structure connected by the plate portion is disposed in the space so that the top surface of the top plate portion is in contact with or close to the connecting portion.
Here, “the space between the front plate portion and the connecting portion is taken and the energy absorbing structure is disposed in the space”, but “the foam is integrated with the skin, the stay and the core material” Even if a part of the “cured foam” enters the space, it is regarded as the headrest of the present invention. As for the foam, even if a part of the foam enters the space, the same effect as the present invention that absorbs the collision energy can be obtained.

請求項１,請求項４の発明のごとく、前板部が連結部との間にエネルギ吸収用の空間をとって、該空間にエネルギ吸収構造体が配設されると、微小曲面のステーに対しても、車両衝突で、天板部を介して連結部と前板部間の距離が近づくことにより立板部に曲げ変形が生じるようになる。この立板部の曲げ変形による角度変位に伴って右肩上がりの荷重が発生し、その後、荷重を維持したまま荷重の伝達角度が大きくなり、矩形波に近い所望のＦＳ特性値が得られる。衝突エネルギを効率良く吸収できる。車両衝突時の安全性を高める。
請求項２の発明のごとく、中央領域の前板部背面に起立して、連結部に当接する支柱が設けられると、衝突力が様々な角度から働いても支柱がガイドして軌道修正するので、エネルギ吸収構造体を有効活用させ、衝突エネルギを安定且つ効率良く吸収する。安全性を飛躍的に向上させる。
請求項３の発明のごとく、支柱の先端部分に側面視ほぼＬ字状のフックが設けられ、これを連結部に掛止できると、芯材のステーへの取付けが容易になる。 As in the first and fourth aspects of the present invention, when the space for absorbing energy is provided between the front plate portion and the connecting portion and the energy absorbing structure is disposed in the space, On the other hand, when the vehicle collides, the vertical plate portion is bent and deformed as the distance between the connecting portion and the front plate portion approaches via the top plate portion. With the angular displacement due to the bending deformation of the standing plate portion, a load that rises to the right is generated. Thereafter, the load transmission angle increases while maintaining the load, and a desired FS characteristic value close to a rectangular wave is obtained. The collision energy can be absorbed efficiently. Increase safety in the event of a vehicle collision.
As in the second aspect of the invention, when a support column is provided that stands on the back surface of the front plate in the central region and contacts the connecting portion, the support column guides and corrects the trajectory even if the collision force works from various angles. The energy absorbing structure is effectively used to absorb the collision energy stably and efficiently. Dramatically improve safety.
As in the third aspect of the invention, when a substantially L-shaped hook in side view is provided at the tip portion of the support column and can be hooked to the connecting portion, the attachment of the core material to the stay becomes easy.

本発明のヘッドレスト及びヘッドレスト用基材は、芯材が取着されたステーにあって、その微小曲面のステーに対しても、車両衝突時にその衝突エネルギを効率良く吸収し、且つ確実,安定して吸収し、乗員頭部の保護を飛躍的に向上させることができ優れた効果を発揮する。 The headrest and the headrest base material of the present invention are in a stay to which a core material is attached, and even in the minute curved stay, the collision energy is efficiently absorbed at the time of a vehicle collision, and is surely and stable. Absorbs the occupant's head and dramatically improves the protection of the occupant's head.

以下、本発明に係るヘッドレスト及びヘッドレスト用基材の実施形態について詳述する。
図１〜図１１は本発明のヘッドレスト及びヘッドレスト用基材の一形態を示したもので、図１はヘッドレストの全体斜視図、図２は図１のヘッドレスト用基材の全体説明斜視図、図３は追突時における圧縮子ストロークとエネルギ吸収用空間の関係を示したヘッドレストの説明断面図、図４はステー横架部とエネルギ吸収構造体について追突前後の変化を示すヘッドレスト用基材の説明断面図、図５は(ロ)がステーと芯材間にエネルギ吸収構造体を介在させた本発明品の説明断面図で、(イ)がその反力特性模式図である。図６は本発明品と従来品とのＦＳ特性対比図、図７は他態様のヘッドレスト用基材の斜視図、図８は(イ)が図７の縦断面説明図、(ロ)が(イ)の状態から追突された後の縦断面説明図、図９は圧縮方向に対するＦＳ特性の変化を示した説明図、図１０は図２と異なる別態様のヘッドレスト用基材の縦断面図、図１１は(イ)が図１のエネルギ吸収構造体の概略側面図、(ロ),(ハ)は(イ)とは異なるエネルギ吸収構造体の他態様品の概略側面図である。尚、図１,図２に比べ、図３,図４ではエネルギ吸収構造体５の両立板部５１が基端に向けて少し広がる姿態にする。図２の左側のヘッドレスト用基材、図３では支柱の図示を省略する。 Hereinafter, embodiments of the headrest and the headrest substrate according to the present invention will be described in detail.
1 to 11 show one embodiment of a headrest and a headrest base material according to the present invention. FIG. 1 is an overall perspective view of the headrest, and FIG. 2 is an overall perspective view of the headrest base material of FIG. 3 is an explanatory cross-sectional view of the headrest showing the relationship between the compressor stroke and the energy absorption space at the time of rear-end collision, and FIG. 4 is an explanatory cross-sectional view of the headrest base material showing changes before and after the rear end of the stay horizontal portion and the energy absorption structure. FIG. 5 and FIG. 5 are explanatory sectional views of the product of the present invention in which (b) an energy absorbing structure is interposed between the stay and the core material, and (b) is a reaction force characteristic schematic diagram thereof. FIG. 6 is an FS characteristic comparison diagram between the product of the present invention and the conventional product, FIG. 7 is a perspective view of another headrest base material, FIG. 8 is a vertical cross-sectional explanatory view of FIG. FIG. 9 is an explanatory view showing a change in FS characteristics with respect to the compression direction, FIG. 10 is a vertical cross-sectional view of a headrest base material according to another aspect different from FIG. 11A is a schematic side view of the energy absorbing structure shown in FIG. 1, and FIGS. 11B and 11C are schematic side views of other embodiments of the energy absorbing structure different from FIG. Compared to FIGS. 1 and 2, in FIGS. 3 and 4, the compatible plate portion 51 of the energy absorbing structure 5 is slightly expanded toward the base end. The headrest base material on the left side of FIG. 2 and the support pillars are not shown in FIG.

（１）ヘッドレスト用基材
ヘッドレスト用基材１はステー２と芯材３と支柱４とエネルギ吸収構造体５とを備える。ステー２は公知品で、一対の脚部２０を平行に配設し、両脚部２０の上端部分２０ａを連結部２１で結ぶステー２とする。ここでは、図１のごとく円柱又はパイプをコ字状に折曲加工して、同じ太さの脚部２０及び連結部２１を形成する。符号２４はシートバック上端９２１に挿着されるステー基端部分を示す(図３)。 (1) Base material for headrest The base material 1 for headrest is provided with the stay 2, the core material 3, the support | pillar 4, and the energy absorption structure 5. FIG. The stay 2 is a known product, and is a stay 2 in which a pair of leg portions 20 are arranged in parallel, and upper end portions 20a of both leg portions 20 are connected by a connecting portion 21. Here, as shown in FIG. 1, the column or pipe is bent into a U shape to form the leg portion 20 and the connecting portion 21 having the same thickness. Reference numeral 24 denotes a stay base end portion inserted into the seat back upper end 921 (FIG. 3).

芯材３は、前板部３０が前記連結部２１との間にエネルギ吸収用空間６をとって、前方へ張出すようにしてステーの上部２ａに取着される板状成形品である(図１,図３)。本実施形態の芯材３は、樹脂成形され、前板部３０と側板部３１と底板部３２と上板部３３とを備える。図２のごとくヘッドレストの前面に向けて、縦断面弧状にした曲板状の前板部３０が張り出す。該前板部３０の下縁から脚部２０側(後方側)へ屈曲して、平板状の底板部３２が延びる。底板部３２の先端縁には、その両脇を切欠いて、一対のステー脚部２０に嵌入する嵌合凹部３２ｂが設けられる。嵌合凹部３２ｂを形成する導入口の部分に係止爪３２ｃが設けられ、該嵌合凹部３２ｂに挿着された脚部２０が抜け出るのを防いでいる。ここでは、底板部３２と、前板部３０の上縁から脚部側に屈曲する上板部３３、及び前板部３０の両側縁から脚部側に屈曲する両側板部３１とで、前板部３０の背面３０ｂを囲って、椀状の頑強にして剛性のある芯材３とする(図１,図２)。本発明では、追突等の車両衝突時の打撃位置や角度によって性能差が出ないよう、受圧面となる芯材３では変形,ＥＡを原則行わない。衝突の衝撃力を芯材３の背面側に設けるエネルギ吸収用空間６、エネルギ吸収構造体５に伝達する。
尚、図３のようにシートバック上端９２１へ取付けられるヘッドレスト及びそのヘッドレスト用基材１にあって、本発明における前方とはヘッドレストから車両前方方向(図３では紙面左方)、上方とは底板部３２から上板部３３に向かう上向き方向(図３では紙面上方)、水平とは底板部３２の板面方向(図３では紙面垂直方向)をいう。符号３０ｃは開孔、符号３２ａは発泡原料の注入用切欠、符号３４は補強リブを示す。剛性のある芯材３とするため、他にも補強リブ３４を芯材３の背面側の随所に設けるが、その図示を省く。 The core member 3 is a plate-shaped molded product that is attached to the upper portion 2a of the stay so that the front plate portion 30 takes an energy absorption space 6 between the front plate portion 30 and the connecting portion 21, and extends forward. Fig. 1 and Fig. 3). The core material 3 of this embodiment is resin-molded and includes a front plate portion 30, a side plate portion 31, a bottom plate portion 32, and an upper plate portion 33. As shown in FIG. 2, a curved plate-like front plate portion 30 having an arcuate longitudinal section projects toward the front surface of the headrest. A flat bottom plate 32 extends from the lower edge of the front plate 30 to the leg 20 side (rear side). The front edge of the bottom plate portion 32 is provided with a fitting recess 32b that is cut out on both sides and fitted into the pair of stay legs 20. A locking claw 32c is provided at the introduction port portion that forms the fitting recess 32b, thereby preventing the leg 20 inserted into the fitting recess 32b from coming out. Here, the bottom plate portion 32, the upper plate portion 33 bent from the upper edge of the front plate portion 30 to the leg portion side, and the both side plate portions 31 bent from both side edges of the front plate portion 30 to the leg portion side, Surrounding the back surface 30b of the plate part 30, the core material 3 is made strong and rigid like a bowl (FIGS. 1 and 2). In the present invention, the core material 3 serving as the pressure receiving surface is not deformed or EA in principle so that there is no difference in performance depending on the striking position and angle at the time of a vehicle collision such as rear-end collision. The impact force of the collision is transmitted to the energy absorbing space 6 and the energy absorbing structure 5 provided on the back side of the core material 3.
In the headrest attached to the seat back upper end 921 and the headrest base material 1 as shown in FIG. 3, the front in the present invention is the vehicle front direction from the headrest (left side in FIG. 3), and the upper is the bottom plate. An upward direction (upward on the paper surface in FIG. 3) from the portion 32 toward the upper plate portion 33, and horizontal means a plate surface direction of the bottom plate portion 32 (vertical direction on the paper surface in FIG. 3). Reference numeral 30c denotes an opening, reference numeral 32a denotes a notch for injection of foaming raw material, and reference numeral 34 denotes a reinforcing rib. In order to obtain the rigid core material 3, other reinforcing ribs 34 are provided at various locations on the back side of the core material 3, but illustration thereof is omitted.

芯材３に係る前板部３０,底板部３２の横幅が、一対の脚部２０間の距離よりも少し大きめに造られる。一対のステー脚部２０の上部、詳しくは上端寄り部分を嵌合凹部３２ｂに挿入して、芯材３が二つの脚部２０に嵌合,係止される(図１)。そして、前板部３０の中間高さ地点、具体的には、図１〜図３のごとく前板部３０の約１／２の高さ地点で、連結部２１が水平に配されるようにする。本実施形態は、芯材３に立設する支柱４の先端部分４１に設けたフック４２を、その水平に配された連結部２１に掛止して、前板部３０と連結部２１との間にエネルギ吸収用空間６が確保される構造とする。芯材３は、前記嵌合凹部３２ｂとこの支柱４を使って、ステー２に取付けられる。 The width of the front plate portion 30 and the bottom plate portion 32 related to the core material 3 is made slightly larger than the distance between the pair of leg portions 20. The upper part of the pair of stay leg parts 20, specifically, the upper end part is inserted into the fitting recess 32b, and the core member 3 is fitted and locked to the two leg parts 20 (FIG. 1). Then, the connecting portion 21 is arranged horizontally at an intermediate height point of the front plate portion 30, specifically, at a height point of about ½ of the front plate portion 30 as shown in FIGS. 1 to 3. To do. In the present embodiment, the hook 42 provided at the tip portion 41 of the support column 4 standing on the core member 3 is hooked to the connecting portion 21 arranged horizontally, and the front plate portion 30 and the connecting portion 21 are connected to each other. The energy absorbing space 6 is secured between them. The core member 3 is attached to the stay 2 using the fitting recess 32b and the support column 4.

支柱４は前板部３０の背面３０ｂの中央域に立設する柱状体で、ここでは芯材３と一体成形で造られている。シートバック上端９２１にヘッドレストが装着されると、支柱４の柱本体４０が前板部背面３０ｂのほぼ垂直面域から車両後方に向けて起立する（図４)。支柱４の先端部が、芯材３のステー２への取付けで水平配設される前記連結部２１に当接する。該連結部２１の長手方向の中間部位２１１と対向する前板部域に、支柱４が起立する。該支柱４が上板部３３側の上方から連結部２１の該中間部位２１１へ当接する(図１,図４)。支柱４には先端部分４１に側面視ほぼＬ字状のフック４２が設けられ、該フック４２を連結部２１に掛止できる構成にする。フック４２を連結部２１に掛止し、嵌合凹部３２ｂに脚部２０を挿着することで、前板部３０が連結部２１との間にエネルギ吸収用空間６をとって、芯材３が三点止めでステー２に安定保持される。そうして、該空間６にエネルギ吸収構造体５が配設される。 The column 4 is a columnar body that stands in the center region of the back surface 30b of the front plate portion 30 and is formed integrally with the core member 3 here. When the headrest is attached to the seat back upper end 921, the column main body 40 of the support column 4 stands up from the substantially vertical surface area of the front plate portion rear surface 30b toward the rear of the vehicle (FIG. 4). The front end portion of the support column 4 abuts on the connecting portion 21 that is horizontally disposed by attaching the core member 3 to the stay 2. The support column 4 stands in a front plate portion region facing the intermediate portion 211 in the longitudinal direction of the connecting portion 21. The support column 4 comes into contact with the intermediate portion 211 of the connecting portion 21 from above the upper plate portion 33 (FIGS. 1 and 4). The support column 4 is provided with a hook 42 having a substantially L shape in a side view at the tip portion 41 so that the hook 42 can be hooked on the connecting portion 21. By hooking the hook 42 to the connecting portion 21 and inserting the leg portion 20 into the fitting recess 32b, the front plate portion 30 takes the space 6 for energy absorption between the connecting portion 21 and the core 3 Is stably held on the stay 2 with a three-point stop. Thus, the energy absorbing structure 5 is disposed in the space 6.

エネルギ吸収構造体５は、前記連結部に沿って延在する板状の立板部５１が対向して前板部背面３０ｂに一対立設し、両立板部５１の先端部分が天板部５２で連結された板状加工部材である。図１,図２のように一対の立板部５１と天板部５２とで側面視ほぼコ字状の樹脂製又は金属製エネルギ吸収構造体５とする。本実施形態は、図２のごとく縦断面視上下方向に配される前板部３０の背面３０ｂに、ほぼ水平配設される上側立板部５１及び下側立板部５１と、両立板部５１の先端部分を結ぶ天板部５２とからなるエネルギ吸収構造体５を固定する。図２,図３のヘッドレスト用基材１の縦断面視で、該天板部５２の背面側(車両後方側)に前記連結部２１が配され、該天板部の上下方向の高さ範囲に水平配設される該連結部の高さ地点が設定される。図１,図２のごとく、文字通り側面視コ字形のエネルギ吸収構造体５とするが、両立板部５１が基端５１ｄに向けて側面視ハ字状に拡がる図３,図４のようなエネルギ吸収構造体５にすることもできる。また、図５(ロ)のように、連結部２１に当接又は近接する部分を一部平坦にして、該平坦部分を天板部５２とした側面視逆Ｕ字状のエネルギ吸収構造体５にすることもできる。さらに、図８〜図１０の上端部中央に窪み５２ｂをもたせて、該窪みを天板部５２とし、全体形状を側面視Ω形状としたエネルギ吸収構造体５や、図１１(ロ),(ハ)に図示したようなエネルギ吸収構造体５とすることもできる。図３,図４,図５,図８(イ),図９〜図１１のエネルギ吸収構造体５は、それが図示された紙面垂直方向ほぼ等断面形状とする。
該エネルギ吸収構造体５は、立板部５１の基端５１ｄが、エネルギ吸収用空間６に在る前板部３０の背面３０ｂに、溶着等により固定される。連結部２１に天板部５２の天面５２ａが当接又は近接するようにして、該空間６に該エネルギ吸収構造体５が配設される。そして、車両衝突で連結部２１と前板部３０間の距離Ｌが近づくことにより、天板部５２を介して、立板部５１に曲げ変形が生じる構造体とする(図３,図４)。 In the energy absorbing structure 5, the plate-like standing plate portion 51 extending along the connecting portion is opposed to the front plate portion back surface 30 b, and the tip portion of the compatible plate portion 51 is the top plate portion 52. It is the plate-shaped processing member connected by. As shown in FIGS. 1 and 2, the pair of upright plate portions 51 and the top plate portion 52 form a resin or metal energy absorption structure 5 that is substantially U-shaped in a side view. In the present embodiment, as shown in FIG. 2, an upper standing plate portion 51 and a lower standing plate portion 51 that are disposed substantially horizontally on the back surface 30 b of the front plate portion 30 that is arranged in the vertical direction in the longitudinal sectional view, and a compatible plate portion. The energy absorbing structure 5 including the top plate portion 52 connecting the tip portions of 51 is fixed. 2 and 3, the connecting portion 21 is arranged on the back side (rear side of the vehicle) of the top plate portion 52 in the longitudinal sectional view of the headrest substrate 1, and the height range of the top plate portion in the vertical direction The height point of the connecting portion disposed horizontally is set. As shown in FIGS. 1 and 2, the energy absorbing structure 5 is literally U-shaped in side view, but the energy is as shown in FIGS. 3 and 4 in which the compatible plate portion 51 extends in a C shape in side view toward the base end 51 d. The absorbent structure 5 can also be formed. Further, as shown in FIG. 5 (b), the portion that abuts or approaches the connecting portion 21 is partially flattened, and the flat portion is the top plate portion 52. It can also be. Furthermore, the energy absorption structure 5 which made the hollow 52b in the center of the upper-end part of FIGS. 8-10, made this hollow into the top-plate part 52, and made the whole shape omega shape by the side view, FIG. The energy absorbing structure 5 as shown in FIG. The energy absorbing structure 5 shown in FIGS. 3, 4, 5, 8 (a), and 9 to 11 has substantially the same cross-sectional shape in the direction perpendicular to the paper.
In the energy absorbing structure 5, the base end 51 d of the standing plate portion 51 is fixed to the back surface 30 b of the front plate portion 30 in the energy absorbing space 6 by welding or the like. The energy absorbing structure 5 is disposed in the space 6 such that the top surface 52a of the top plate portion 52 is in contact with or close to the connecting portion 21. Then, when the distance L between the connecting portion 21 and the front plate portion 30 approaches due to a vehicle collision, the vertical plate portion 51 is bent and deformed via the top plate portion 52 (FIGS. 3 and 4). .

本ヘッドレスト用基材１は、追突などの車両衝突で、連結部２１と前板部３０間の距離Ｌが近づくことにより、立板部５１に曲げ変形が生じるエネルギ吸収構造体５が、その曲げ変形でもって衝突エネルギを吸収する。例えば、図５(ロ)に示すエネルギ吸収構造体５にあって、追突等で連結部２１に矢印方向の外力が加わると、該外力に連結部２１が押され、連結部２１と前板部３０間を縮めようとする圧縮力が働く。連結部２１からの圧縮力が天板部５２の板面で受け止められて、連結部２１,天板部５２と前板部３０間の距離Ｌが縮まり(図３)、立板部５１が外側に膨らむように曲げ変形が発生する。
本ヘッドレスト用基材１に係るエネルギ吸収構造体５は、図１４の構造体ブロック等にみられる座屈荷重を用いるのでなく、図５(ロ)のごとく、曲率をもった立板部５１の曲げ荷重を用いる。立板部５１の曲げ荷重をエネルギ吸収に活用する。ここで、エネルギ吸収構造体５が設置される空間６内では、該構造体以外に、圧縮子(ここでは連結部２１)の進行方向直下に構造物を配設しない。エネルギ吸収構造体５の側面視コ字形の枠体内５０は空所とする。底付き荷重の発生を回避し、高いストローク効率を得るためである。エネルギ吸収構造体５の曲げ荷重は、図５(イ)のごとく、立板部５１の曲げによる角度変位に伴って右肩上がりの荷重を発生するが、圧縮方向を所定の直線軌道に導ければ、その入力方向の圧縮力に対して曲げ荷重の伝達角度が大きくなることで矩形波を形成する。 In the headrest base material 1, the energy absorption structure 5 in which bending deformation occurs in the upright plate portion 51 when the distance L between the connecting portion 21 and the front plate portion 30 approaches in a vehicle collision such as a rear-end collision is generated. The collision energy is absorbed by deformation. For example, in the energy absorbing structure 5 shown in FIG. 5 (b), when an external force in the direction of the arrow is applied to the connecting portion 21 by a collision or the like, the connecting portion 21 is pushed by the external force, and the connecting portion 21 and the front plate portion A compressive force that attempts to shrink the space between 30 works. The compressive force from the connecting portion 21 is received by the plate surface of the top plate portion 52, the distance L between the connecting portion 21, the top plate portion 52 and the front plate portion 30 is reduced (FIG. 3), and the upright plate portion 51 is outside. Bending deformation occurs to swell.
The energy absorbing structure 5 according to the headrest substrate 1 does not use the buckling load seen in the structure block of FIG. 14, but instead of the upright plate portion 51 having a curvature as shown in FIG. Use bending load. The bending load of the upright plate portion 51 is utilized for energy absorption. Here, in the space 6 in which the energy absorbing structure 5 is installed, no structure is disposed directly below the direction of travel of the compressor (here, the connecting portion 21) other than the structure. The frame body 50 that is U-shaped in a side view of the energy absorbing structure 5 is a void. This is to avoid generation of a load with a bottom and to obtain high stroke efficiency. As shown in FIG. 5 (a), the bending load of the energy absorbing structure 5 generates a load that rises to the right along with the angular displacement caused by the bending of the standing plate portion 51. However, the compression direction can be guided to a predetermined linear track. For example, a rectangular wave is formed by increasing the transmission angle of the bending load with respect to the compressive force in the input direction.

追突された際、効果的にＥＡを行うには、目的とする荷重を維持したままエネルギ吸収構造体５を変形させる必要がある。追突では、例えば目標荷重となる600[Ｎ]前後といった低い荷重で、60mm程度もの長いストロークのＥＡ特性が安定動作することが求められるが、本エネルギ吸収構造体５を用いれば、そうしたＥＡ特性を確保できる。立板部５１の板厚ｔ_１さらに天板部５２の板厚ｔ_２(図１１参照)を適宜選定することによって、所望の矩形波が得られる。本発明は、二枚の向かい合う板状の立板部５１が受ける荷重の和で反力特性を出すので、圧縮方向は天板部５２の天面５２ａ上で、一対の立板部５１からほぼ等距離の中間部分に面直(天面５２ａに垂直)に設定するのが好ましい。連結部２１は天板部５２の天面５２ａで、一対の立板部５１からほぼ等距離の中間域に当接又は近接して、且つ両立板部５１に平行に配されるのが好ましくなる。さらにいえば、図３のごとく前板部３０と天板部５２と連結部２１とがほぼ平行になるよう配されるのが好ましい。 In order to effectively perform EA when the rear-end collision occurs, it is necessary to deform the energy absorbing structure 5 while maintaining the target load. In the rear-end collision, it is required that the EA characteristic with a long stroke of about 60 mm is stably operated at a low load of, for example, about 600 [N], which is the target load. It can be secured. A desired rectangular wave can be obtained by appropriately selecting the plate thickness t ₁ of the upright plate portion 51 and the plate thickness t ₂ (see FIG. 11) of the top plate portion 52. In the present invention, since the reaction force characteristic is obtained by the sum of the loads received by the two plate-like standing plate portions 51 facing each other, the compression direction is substantially the same as the distance from the pair of standing plate portions 51 on the top surface 52a of the top plate portion 52. It is preferable to set it to be a plane (perpendicular to the top surface 52a) at an equal distance in the middle. The connecting portion 21 is preferably a top surface 52 a of the top plate portion 52, and is arranged in contact with or close to an intermediate region that is substantially equidistant from the pair of standing plate portions 51 and parallel to the compatible plate portion 51. . Furthermore, as shown in FIG. 3, it is preferable that the front plate portion 30, the top plate portion 52, and the connecting portion 21 are arranged substantially in parallel.

かくして、困難視されてきた微小曲面に相当するステー２(横断面が小さな円形)に係る連結部２１に、圧縮力が作用しても、そのエネルギをまず天板部５２の天面５２ａで受け止め、さらに、これを介して一対の立板部５１の曲げ変形による曲げ荷重として受け入れ、安定且つ効率的なエネルギ吸収を行う。本ヘッドレスト用基材１では、圧縮力が加わった時のエネルギ吸収構造体５の反力特性が図５(イ)のようになり、図１４(イ)で示した理想の矩形波(目標値)に近づく。実際、図６のごとく、芯材３をステー２に取着しただけの従来品と違って、前板部３０の背面側の空間６にエネルギ吸収構造体５が配設された本発明品に、理想の矩形波に近いＦＳ特性値が得られるのを確認している。尚、図１〜図１１では、図面を判り易くするため、芯材３の板厚と立板部５１の板厚を略同じに図示するが、実際の立板部５１の板厚ｔ_１は、圧縮力により曲げ変形を発生させるため、図示板厚よりも小さい。 Thus, even if a compressive force is applied to the connecting portion 21 related to the stay 2 (circular shape with a small cross section) corresponding to the minute curved surface that has been regarded as difficult, the energy is first received by the top surface 52a of the top plate portion 52. Further, through this, it is accepted as a bending load due to bending deformation of the pair of standing plate portions 51, and stable and efficient energy absorption is performed. In the headrest base material 1, the reaction force characteristic of the energy absorbing structure 5 when a compressive force is applied is as shown in FIG. 5 (a), and the ideal rectangular wave (target value) shown in FIG. ) Actually, as shown in FIG. 6, unlike the conventional product in which the core 3 is attached to the stay 2, the product of the present invention in which the energy absorbing structure 5 is disposed in the space 6 on the back side of the front plate 30. It has been confirmed that an FS characteristic value close to an ideal rectangular wave can be obtained. 1 to 11, in order to make the drawings easy to understand, the plate thickness of the core material 3 and the plate thickness of the upright plate portion 51 are shown to be substantially the same, but the actual plate thickness t ₁ of the upright plate portion 51 is Since the bending deformation is generated by the compressive force, it is smaller than the illustrated plate thickness.

ところで、図９(イ)で、圧縮方向が連結部２１の軸芯を通って天板部５２の天面５２ａ、さらに芯材３の前板部３０の受面に直交するようなａ方向であれば、同図(ロ)に示す所望の矩形波になる。圧縮方向を特定の直線軌道、具体的には図５(ロ)の矢印方向に固定できれば、圧縮力の入力方向の変位が大きくなるにしたがい同図に示す矩形波が得られる。しかしながら、圧縮方向を固定できなければ該矩形波を得るのが難しい。圧縮方向が連結部２１の軸芯を通って立板部５１を横切る図９(イ)のｂ方向になると、同図(ロ)に示すごとく満足な矩形波を得ることができない。
こうしたことから、本実施形態のヘッドレスト用基材１は、ｂ方向のような圧縮力がたとえ働くようになったとしても、満足のいくエネルギ吸収ができるよう前記支柱４を設けている。連結部２１の中間部位２１１と前板部３０間の中央領域ＴＲを空けて、該中央領域の両側にエネルギ吸収構造体５がそれぞれ配設される(図１,図２)。中央領域ＴＲはエネルギ吸収構造体５を配設しないで、該中央領域の両側にエネルギ吸収構造体５がそれぞれ配設される。そうして、該中央領域ＴＲの前板部背面３０ｂに起立して、連結部２１に当接する支柱４が設けられる。 By the way, in FIG. 9 (a), the compression direction passes through the shaft core of the connecting portion 21 and is in the a direction so as to be orthogonal to the top surface 52a of the top plate portion 52 and the receiving surface of the front plate portion 30 of the core member 3. If there is, the desired rectangular wave shown in FIG. If the compression direction can be fixed to a specific linear trajectory, specifically the arrow direction in FIG. 5B, the rectangular wave shown in the figure can be obtained as the displacement in the input direction of the compression force increases. However, it is difficult to obtain the rectangular wave unless the compression direction can be fixed. When the compression direction passes through the axis of the connecting portion 21 and crosses the upright plate portion 51 and becomes the b direction in FIG. 9A, a satisfactory rectangular wave cannot be obtained as shown in FIG.
For these reasons, the headrest base material 1 of the present embodiment is provided with the support columns 4 so that the energy can be absorbed satisfactorily even if a compressive force as in the b direction is applied. The energy absorbing structures 5 are respectively disposed on both sides of the central region with a central region TR between the intermediate portion 211 of the connecting portion 21 and the front plate portion 30 (see FIGS. 1 and 2). The energy absorption structure 5 is not disposed in the central region TR, and the energy absorption structures 5 are disposed on both sides of the central region. Thus, a support column 4 is provided that stands on the front plate portion rear surface 30b of the central region TR and comes into contact with the connecting portion 21.

前記支柱４が設けられることによって、図９に図示するｂ方向の圧縮力が働いても、支柱４の規制を受けて、図４の矢印方向、すなわち図９のａ方向に是正される。圧縮力が加えられた連結部２１が、支柱４の柱本体４０を滑動しながら、天板部５２の受面、芯材３の前板部３０の受面に直交するように進む。図９のｂ方向の圧縮力が働いても、図９のａ方向に軌道修正され、所望の矩形波が得られる。
図７ごとくの支柱４,エネルギ吸収構造体５を有するヘッドレスト用基材１でも、追突時に支柱４が連結部２１をガイドして、図８(イ)の状態から同図(ロ)のようにエネルギ吸収構造体５の曲げ荷重,曲げ座屈へと導き、期待通りの衝突エネルギを吸収する。
現実の追突事故では、軽衝突の場合、立板部５１の曲げ荷重で衝突エネルギを吸収して乗員頭部ＨＤの保護を図る。その後、立板部５１がゆっくりと復元する。重衝突では、最終的に立板部５１の座屈破壊に至る場合もあるが、衝突の際の前半段階で、立板部５１の弾性復元する曲げ変形,座屈変形による曲げ荷重として効率良く且つ多くの衝突エネルギを吸収する。本ヘッドレスト用芯材３は、図１〜図３のごとくヘッドレスト内に内蔵され、追突時の乗員頭部ＨＤに働く相対的な運動エネルギを効果的に吸収する。 By providing the column 4, even if a compressive force in the direction b shown in FIG. 9 is applied, the column 4 is regulated and corrected in the direction of the arrow in FIG. 4, that is, the direction a in FIG. The connecting portion 21 to which the compressive force is applied moves so as to be orthogonal to the receiving surface of the top plate portion 52 and the receiving surface of the front plate portion 30 of the core member 3 while sliding the column main body 40 of the support column 4. Even if the compressive force in the direction b in FIG. 9 is applied, the trajectory is corrected in the direction a in FIG. 9 and a desired rectangular wave is obtained.
Even in the headrest base material 1 having the support column 4 and the energy absorbing structure 5 as shown in FIG. 7, the support column 4 guides the connecting portion 21 at the time of the rear-end collision, and the state shown in FIG. It leads to bending load and bending buckling of the energy absorbing structure 5 and absorbs the collision energy as expected.
In an actual rear-end collision, in the case of a light collision, the collision energy is absorbed by the bending load of the standing plate portion 51 to protect the occupant head HD. Then, the standing board part 51 restore | restores slowly. In the case of a heavy collision, the buckling failure of the standing plate portion 51 may eventually occur, but in the first half of the collision, the bending deformation that elastically restores the standing plate portion 51 and the bending load due to the buckling deformation are efficiently performed. And it absorbs a lot of collision energy. The headrest core material 3 is incorporated in the headrest as shown in FIGS. 1 to 3 and effectively absorbs the relative kinetic energy acting on the occupant head HD at the time of a rear-end collision.

次に、図３を用いて、追突時の乗員頭部ＨＤに働く相対的な運動エネルギを効果的に吸収する構造をさらに詳しく説明する。
既述のごとく、連結部２１にフック４２を掛止する一方、ステー脚部２０に嵌合凹部３２ｂを嵌合して、芯材３がステー２に取付けられている。前板部３０と連結部２１との間にエネルギ吸収用空間６が設けられる。連結部２１が芯材３の中間高さ地点で水平に配され、且つ脚部２０上を芯材３に係る嵌合凹部３２ｂの嵌合部分が摺動可能であるので、追突されると、該嵌合部分が脚部２０を摺動変位しながら、芯材３はこの摺動変位点を支点に同図鎖線のごとく回転変位可能になる。同図中、矢印は圧縮子(ここでは、乗員頭部ＨＤを模した168mmφの球体)の進行軌道を示す。追突時の相対的な運動エネルギをもった圧縮子は、初期接触位置Ｘから芯材干渉位置Ｙを経て、フルストローク位置Ｚへと進行する。芯材干渉位置Ｙに達した地点から、エネルギ吸収構造体５の立板部５１が曲げ変形、さらに曲げ座屈によってエネルギを吸収していく。これと並行して、脚部２０を嵌合部分が摺動しながら該嵌合部分を支点に芯材３が回転し、芯材３が鎖線のごとく後傾する。
かくして、芯材３のこの後傾により、芯材干渉位置Ｙから鎖線の後傾した芯材３に達するフルストローク位置Ｚまでの距離が圧縮子ストロークＡＬになる。本ヘッドレスト用基材１では、エネルギ吸収用空間６の距離Ｌに比べて長い圧縮子ストロークＡＬが確保される。この長い圧縮子ストロークＡＬが確保されることによって、追突時の乗員頭部ＨＤに働く相対的な運動エネルギを効率良く吸収する。 Next, the structure for effectively absorbing the relative kinetic energy acting on the occupant head HD at the time of rear-end collision will be described in more detail with reference to FIG.
As described above, the hook 42 is hooked on the connecting portion 21, while the fitting recess 32 b is fitted to the stay leg portion 20, and the core member 3 is attached to the stay 2. An energy absorbing space 6 is provided between the front plate portion 30 and the connecting portion 21. Since the connecting portion 21 is horizontally disposed at the intermediate height point of the core material 3 and the fitting portion of the fitting recess 32b related to the core material 3 can slide on the leg portion 20, While the fitting portion slides and displaces the leg portion 20, the core material 3 can be rotationally displaced as indicated by a chain line in FIG. In the figure, the arrows indicate the traveling trajectory of the compressor (here, a 168 mmφ sphere simulating the occupant head HD). The compressor having the relative kinetic energy at the time of the collision advances from the initial contact position X to the full stroke position Z through the core material interference position Y. From the point where the core material interference position Y is reached, the standing plate portion 51 of the energy absorbing structure 5 absorbs energy by bending deformation and further bending buckling. In parallel with this, the core member 3 rotates with the fitting portion as a fulcrum while the fitting portion slides on the leg 20, and the core member 3 tilts backward like a chain line.
Thus, due to this backward tilting of the core material 3, the distance from the core material interference position Y to the full stroke position Z reaching the core material 3 tilted backward from the chain line becomes the compressor stroke AL. In the headrest base 1, a longer compressor stroke AL is ensured than the distance L of the energy absorbing space 6. By securing the long compressor stroke AL, the relative kinetic energy acting on the occupant head HD at the time of rear-end collision is efficiently absorbed.

本エネルギ吸収構造体５に関しては、先に樹脂製又は金属製であるとしたが、樹脂製の方がより好ましい。立板部５１が曲げ変形,曲げ座屈することにより、衝突エネルギを反力として吸収するが、その後、樹脂製品の方が金属製品よりもゆっくりと復元し、頭部にダメージを与えないからである。また、樹脂製であれば、エネルギ吸収構造体５と樹脂製芯材３とを一体成形でき、低コスト化が図れるからである。芯材３とエネルギ吸収構造体５の一体成形品では、天板部５２と対向する前板部３０に図１０(ロ)のごとく開口部を設けた芯材３としてもよい。開口部を設けても、開口部のないヘッドレスト用基材１とほぼ同様の効果が得られるからである。 The energy absorbing structure 5 is previously made of resin or metal, but is preferably made of resin. When the vertical plate 51 is bent and bent and buckled, the collision energy is absorbed as a reaction force, but the resin product is then restored more slowly than the metal product and does not damage the head. . In addition, if it is made of resin, the energy absorbing structure 5 and the resin core material 3 can be integrally formed, and the cost can be reduced. In the integrally molded product of the core material 3 and the energy absorbing structure 5, the core material 3 may be provided in which an opening is provided in the front plate portion 30 facing the top plate portion 52 as shown in FIG. This is because even if the opening is provided, substantially the same effects as those of the headrest substrate 1 having no opening can be obtained.

（２）ヘッドレスト
本ヘッドレストは、袋状表皮７と前記ステー２と前記芯材３と、該ステーの上部２ａ及び該芯材３が配設された表皮内７０に発泡原料を注入し、該表皮、該ステー及び該芯材と一体化させて発泡硬化した発泡体８と、を備えるヘッドレストにあって、袋状表皮内７０にステー下部以外の前記ヘッドレスト用基材１を配設して、該表皮内に発泡原料を注入し一体成形されるものである。芯材３が、その前板部３０と連結部２１との間にエネルギ吸収用空間６をとって、前方へ張出すようにしてステーの上部２ａに取着される。一方、前板部３０の背面３０ｂに前記連結部２１に沿って延在する一対の立板部５１を対向して立設させ、且つ両立板部５１の先端部分を天板部５２で連結したエネルギ吸収構造体５が、該天板部５２の天面５２ａを連結部２１に当接又は近接させるようにして前記空間６内に配設される。車両衝突で連結部２１と前板部３０間の距離Ｌが近づくことにより立板部５１に曲げ変形が生じるようにしたヘッドレストである。 (2) Headrest This headrest is made by injecting a foaming raw material into the bag-shaped skin 7, the stay 2, the core material 3, the upper portion 2a of the stay, and the inner skin 70 where the core material 3 is disposed. A foam 8 that is integrated with the stay and the core and foamed and hardened, and the headrest base material 1 other than the lower portion of the stay is disposed in the bag-like skin 70, A foaming raw material is injected into the skin and integrally molded. The core member 3 is attached to the upper portion 2a of the stay so as to project forward with the energy absorbing space 6 between the front plate portion 30 and the connecting portion 21. On the other hand, a pair of upright plate portions 51 extending along the connecting portion 21 are opposed to the back surface 30 b of the front plate portion 30, and the tip portion of the compatible plate portion 51 is connected by the top plate portion 52. The energy absorbing structure 5 is disposed in the space 6 so that the top surface 52a of the top plate portion 52 is in contact with or close to the connecting portion 21. This is a headrest in which a bending deformation occurs in the upright plate portion 51 as the distance L between the connecting portion 21 and the front plate portion 30 approaches due to a vehicle collision.

袋状表皮７は図１〜図３ごとくの枕状に形成され、底面部７２には発泡原料注入口７２ａ、ステー用孔７２ｂが設けられる。通常は、乗員頭部ＨＤに前面部７１が接触し、クッション性に富む発泡体８の快適さを乗員に伝える。一方、ヘッドレスト内にエネルギ吸収用空間６を設け、該空間６にエネルギ吸収構造体５が配設され、衝突エネルギを吸収する。車両衝突時(ＥＡ動作時)に、ステー連結部２１がエネルギ吸収用空間６内の特定の軌道を通過するようガイドする支柱４が設けられ、安定して衝突エネルギ吸収ができるようにしている。 The bag-like skin 7 is formed in a pillow shape as shown in FIGS. 1 to 3, and the bottom surface portion 72 is provided with a foaming material inlet 72 a and stay holes 72 b. Usually, the front portion 71 comes into contact with the occupant's head HD and conveys the comfort of the foam 8 rich in cushioning properties to the occupant. On the other hand, an energy absorbing space 6 is provided in the headrest, and an energy absorbing structure 5 is disposed in the space 6 to absorb collision energy. In the event of a vehicle collision (EA operation), a support column 4 is provided to guide the stay connecting portion 21 so as to pass a specific track in the energy absorbing space 6 so that the collision energy can be stably absorbed.

ヘッドレストにおいても、既述のごとく、エネルギ吸収構造体５が設置されるエネルギ吸収用空間６では、該構造体以外に、圧縮子(ここでは連結部２１)の進行方向直下に構造物を配設しないようにする。但し、本ヘッドレストにあっては、該構造物から発泡体８が除かれる。発泡体８は表皮７,ステー２,芯材３と一体成形で発泡硬化したものである。発泡体８に関しては、該一体成形で図１０のようにエネルギ吸収用空間６に侵入或いは充填されても、障害になることが少なく、本発明と同様の効果が得られるからである。
ヘッドレスト用基材１,ステー２,芯材３,支柱４,エネルギ吸収構造体５,エネルギ吸収用空間６,中央領域ＴＲ等は、（１）ヘッドレスト用基材１の項で述べた構成と同様で、その説明を省く。同一符号は同一又は相当部分を示す。 Also in the headrest, as described above, in the energy absorbing space 6 in which the energy absorbing structure 5 is installed, in addition to the structure, a structure is disposed directly below the direction of travel of the compressor (here, the connecting portion 21). Do not. However, in the present headrest, the foam 8 is removed from the structure. The foam 8 is foam-cured by integral molding with the skin 7, the stay 2, and the core material 3. This is because the foam 8 is less likely to become an obstacle even if the foam 8 enters or fills the energy absorbing space 6 as shown in FIG. 10, and the same effect as the present invention can be obtained.
The headrest base material 1, stay 2, core material 3, support column 4, energy absorption structure 5, energy absorption space 6, central region TR and the like are the same as those described in (1) Headrest base material 1. I will omit the explanation. The same reference numerals indicate the same or corresponding parts.

（３）効果
このように構成したヘッドレスト及びヘッドレスト用基材は、専ら立板部５１の曲げ荷重を主体としてエネルギ吸収し、その弾性域で所望の矩形波をもつＥＡ特性が得られるので、衝突エネルギを効率良く吸収できる。微小曲面をもつステー２に対しても、該ステー２からの圧縮力を天板部５２の面で一旦受け、これを立板部５１の曲げ変形により衝突エネルギを吸収するので、安定且つ効果的なエネルギ吸収を行える。前板部３０と該連結部２１との間にエネルギ吸収用空間６を設け、該空間にエネルギ吸収構造体５を配設するので、エネルギ吸収用空間６に配設されるエネルギ吸収構造体５の高さぎりぎりまで、ＦＳ特性の変位として活用する矩形波を形成でき、衝突エネルギを効果的に吸収できる。エネルギ吸収構造体５は、立板部５１,天板部５２の板厚ｔ_１,ｔ_２及びその延在長によってＦＳ特性の出力調整が容易であることから、目的,用途に応じたヘッドレスト及びヘッドレスト用基材１を簡単に製造できる。 (3) Effects The headrest and the headrest base material configured as described above absorb energy mainly by the bending load of the standing plate portion 51, and can obtain an EA characteristic having a desired rectangular wave in its elastic region. Energy can be absorbed efficiently. Even for the stay 2 having a minute curved surface, the compressive force from the stay 2 is once received by the surface of the top plate portion 52, and this is absorbed by the bending deformation of the upright plate portion 51, so that it is stable and effective. Energy absorption. Since the energy absorbing space 6 is provided between the front plate portion 30 and the connecting portion 21 and the energy absorbing structure 5 is disposed in the space, the energy absorbing structure 5 disposed in the energy absorbing space 6 is provided. A rectangular wave that is utilized as a displacement of the FS characteristic can be formed up to the height of the height, and collision energy can be effectively absorbed. Since the energy absorption structure 5 can easily adjust the output of the FS characteristic by the plate thicknesses t ₁ and t ₂ of the upright plate portion 51 and the top plate portion 52 and the extension length thereof, The headrest substrate 1 can be easily manufactured.

そして、専ら立板部５１の曲げ荷重を主体としてその弾性域で吸収するため、その範囲において、エネルギ吸収構造体５が破壊,損傷することがなく、軽衝突であれば再利用できる。曲げ荷重を主体としたエネルギ吸収構造体５にしているので、破壊しない限り、再使用に耐える。
また、支柱４で特定の方向に圧縮力を誘導することにより、様々な方向からの車両衝突にもエネルギ吸収構造体５を有効機能させ、衝突エネルギを安定して吸収できる。安全性を飛躍的に向上させたヘッドレスト及びヘッドレスト用基材になっている。 Since the bending load of the standing plate portion 51 is mainly absorbed in the elastic region, the energy absorbing structure 5 is not broken or damaged in that range, and can be reused if it is a light collision. Since the energy absorbing structure 5 is mainly composed of a bending load, it can withstand reuse unless broken.
Further, by inducing a compressive force in a specific direction by the support column 4, the energy absorbing structure 5 can effectively function even in a vehicle collision from various directions, and the collision energy can be stably absorbed. It is a headrest and a base material for headrest that have dramatically improved safety.

さらに、連結部２１に支柱４のフック４２を掛止する一方、ステー脚部２０に嵌合凹部３２ｂを嵌合して芯材３がステー２に取付けられるので、追突の衝突エネルギを受けた際、芯材３を回転,スライドさせることで、図３のごとく必要ストロークよりも小さなエネルギ吸収用空間６で対応でき、長い圧縮子ストロークＡＬが確保しづらいヘッドレストにあって、極めて理にかなったヘッドレスト及びヘッドレスト用基材１になっている。
加えて、エネルギ吸収構造体５は樹脂製とすることにより、その単純形状から成形方法の選択幅が広がる。また、芯材３との一体成形が可能であり、コスト低減、リサイクルに優れた効果を発揮する。 Further, the hook 42 of the support column 4 is hooked to the connecting portion 21, and the core recess 3 b is fitted to the stay leg portion 20 so that the core member 3 is attached to the stay 2. By rotating and sliding the core material 3, the headrest can be accommodated in a space 6 for energy absorption smaller than the required stroke as shown in FIG. 3, and it is difficult to secure a long compressor stroke AL. And it is the base material 1 for headrests.
In addition, since the energy absorbing structure 5 is made of resin, the selection range of the molding method is widened from its simple shape. Moreover, integral molding with the core material 3 is possible, and the effect excellent in cost reduction and recycling is exhibited.

尚、本発明においては、前記実施例に示すものに限られず、目的，用途に応じて本発明の範囲で種々変更できる。ヘッドレスト用基材１,ステー２,芯材３,支柱４,エネルギ吸収構造体５,エネルギ吸収用空間６,表皮７,発泡体８等の形状，大きさ，個数などは用途に応じて適宜選択できる。 The present invention is not limited to those shown in the above-described embodiments, and various modifications can be made within the scope of the present invention depending on the purpose and application. The shape, size, number, etc. of the headrest base material 1, stay 2, core material 3, support column 4, energy absorption structure 5, energy absorption space 6, skin 7, foam 8 and the like are appropriately selected according to the application. it can.

本発明のヘッドレストの一形態で、そのヘッドレストの全体斜視図である。It is one form of the headrest of this invention, and is the whole perspective view of the headrest. 図１のヘッドレスト用基材の全体説明斜視図である。It is a whole explanatory perspective view of the base material for headrests of FIG. 追突時における圧縮子ストロークとエネルギ吸収用空間の関係を示したヘッドレストの説明断面図である。It is explanatory sectional drawing of the headrest which showed the relationship between the compressor stroke and the energy absorption space at the time of a rear-end collision. ステー横架部とエネルギ吸収構造体について追突前後の変化を示すヘッドレスト用基材の説明断面図である。It is explanatory sectional drawing of the base material for headrests which shows the change before and behind a collision about a stay horizontal part and an energy absorption structure. (ロ)がステーと芯材間にエネルギ吸収構造体を介在させた本発明品の説明断面図で、(イ)がその反力特性模式図である。(B) is an explanatory cross-sectional view of the product of the present invention in which an energy absorbing structure is interposed between the stay and the core material, and (B) is a reaction force characteristic schematic diagram thereof. 本発明品と従来品とのＦＳ特性対比図である。It is a FS characteristic comparison figure of this invention product and a conventional product. 他態様のヘッドレスト用基材の斜視図を示す。The perspective view of the base material for headrests of another aspect is shown. (イ)が図７の縦断面説明図、(ロ)が(イ)の状態から追突された後の縦断面説明図である。(A) is a longitudinal cross-sectional explanatory drawing of FIG. 7, (b) is a vertical cross-sectional explanatory drawing after the rear-end collision from the state of (b). 圧縮方向に対するＦＳ特性の変化を示した説明図である。It is explanatory drawing which showed the change of FS characteristic with respect to the compression direction. 図２と異なる別態様のヘッドレスト用基材の縦断面図である。It is a longitudinal cross-sectional view of the base material for headrests of another aspect different from FIG. (イ)が図１のエネルギ吸収構造体の概略側面図、(ロ),(ハ)は(イ)とは異なるエネルギ吸収構造体の他態様品の概略側面図である。(A) is a schematic side view of the energy absorption structure of FIG. 1, (b), (c) is a schematic side view of another embodiment of the energy absorption structure different from (a). 従来技術の説明図である。It is explanatory drawing of a prior art. 従来技術の説明図である。It is explanatory drawing of a prior art. 従来技術の説明図である。It is explanatory drawing of a prior art.

符号の説明Explanation of symbols

１ヘッドレスト用基材
２ステー
２０脚部
２０ａ上端部分
２１連結部
２１１中間部位
３芯材
３０前板部
３０ｂ背面
４支柱
４１フック
５エネルギ吸収構造体
５１立板部
５２天板部
６エネルギ吸収用空間(空間)
７表皮
８発泡体
Ｌ連結部と前板部間の距離
ＴＲ中央領域 DESCRIPTION OF SYMBOLS 1 Headrest base material 2 Stay 20 Leg part 20a Upper end part 21 Connection part 211 Intermediate part 3 Core material 30 Front plate part 30b Back surface 4 Support | pillar 41 Hook 5 Energy absorption structure 51 Standing plate part 52 Top plate part 6 Energy absorption space (space)
7 Skin 8 Foam L Distance between connecting part and front plate part TR Central area

Claims

一対の脚部の上端部分が連結部で結合されたステーと、前板部が該連結部との間にエネルギ吸収用空間をとって、ステーの上部に取付けられる芯材と、該前板部の背面に一対の立板部が対向して立設し、両立板部が天板部で連結されたエネルギ吸収構造体と、を具備し、且つ前記連結部に前記天板部の天面が当接又は近接するようにして、該エネルギ吸収構造体が前記空間に配設されることを特徴とするヘッドレスト用基材。 A stay in which the upper end portions of a pair of legs are coupled by a connecting portion; a core member attached to the upper portion of the stay by taking a space for energy absorption between the connecting portion and the front plate portion; and the front plate portion A pair of upright plates facing each other and an energy absorbing structure in which the compatible plate portions are connected by a top plate portion, and the top surface of the top plate portion is connected to the connection portion. A base material for a headrest, wherein the energy absorbing structure is disposed in the space so as to abut or approach.

前記連結部の中間部位と前板部間の中央領域は前記エネルギ吸収構造体を配設しないで、該中央領域の両側に前記エネルギ吸収構造体がそれぞれ配設され、さらに該中央領域の前板部背面に起立して、前記連結部に当接する支柱が設けられる請求項１記載のヘッドレスト用基材。 The energy absorbing structure is not disposed in the central region between the intermediate portion of the connecting portion and the front plate portion, and the energy absorbing structure is disposed on both sides of the central region, and the front plate of the central region is further provided. The base material for headrests of Claim 1 in which the support | pillar which stands up in a part back surface and contact | abuts to the said connection part is provided.

前記支柱の先端部分に側面視ほぼＬ字状のフックが設けられ、前記連結部に掛止できるようにした請求項２記載のヘッドレスト用基材。 The headrest base material according to claim 2, wherein a hook having a substantially L shape in a side view is provided at a tip portion of the support column and can be hooked to the connecting portion.

袋状表皮と、一対の脚部の上端部分が連結部で結合されたステーと、該ステーの上部に取付けられる芯材と、該ステーの上部及び該芯材が配設された前記表皮内に発泡原料を注入し、該表皮、該ステー及び該芯材と一体化させて発泡硬化した発泡体と、を備えるヘッドレストにあって、
前記芯材が、その前板部と前記連結部との間にエネルギ吸収用空間をとって、ステーの上部に取付けられる一方、前記前板部の背面に一対の立板部を対向して立設させ、且つ両立板部を天板部で連結したエネルギ吸収構造体が、該天板部の天面を前記連結部に当接又は近接させるようにして前記空間に配設されることを特徴とするヘッドレスト。 A bag-like skin, a stay in which the upper ends of a pair of leg portions are joined by a connecting portion, a core material attached to the upper portion of the stay, and the upper portion of the stay and the skin where the core material is disposed Injecting a foaming raw material, a foam that is foam-cured and integrated with the skin, the stay and the core, and a headrest comprising:
The core member is attached to the upper portion of the stay with a space for energy absorption between the front plate portion and the connecting portion, and a pair of upright plate portions are opposed to the back surface of the front plate portion. And the energy absorbing structure in which the compatible plate portions are connected by the top plate portion is disposed in the space so that the top surface of the top plate portion is in contact with or close to the connecting portion. And headrest.