JP2009255862A

JP2009255862A - Headrest and base for headrest

Info

Publication number: JP2009255862A
Application number: JP2008110147A
Authority: JP
Inventors: Hiyoshi Ishikawa; 日吉石川; Yukihiro Sakakibara; 行宏榊原
Original assignee: Inoue MTP KK; Inoac Corp
Current assignee: Inoac Corp
Priority date: 2008-04-21
Filing date: 2008-04-21
Publication date: 2009-11-05
Anticipated expiration: 2028-04-21
Also published as: JP5366116B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headrest capable of effectively absorbing impact energy by securing a longer stroke for absorbing the impact energy than before and also provide a base for the headrest. <P>SOLUTION: This headrest comprises a stay 2 formed by connecting the upper end portions of a pair of leg sections 20 through a horizontal part 21, a core 3 which has a front plate part 30 disposed with an energy absorbing gap 6 interposed between the horizontal part and itself, which has a bottom plate part 32 the rear end edge 32d of which is fitted to each leg part 20, and which is so attached to the upper part 2a of the stay 2 as to be rotated rearward about the fitted portion of the rear end edge 32f when an acting force exceeding a specified level is applied thereto, and an energy absorbing body 5 disposed in the gap 6 by making deformable more than the core. <P>COPYRIGHT: (C)2010,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。このヘッドレストは、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１,２）。 A headrest is attached to the upper end of a seat back of an automobile or the like for comfort. In recent years, several headrests have been proposed for the purpose of protecting the head of an occupant in the event of a vehicle collision (for example, Patent Documents 1 and 2).

特開２００６−６８２３公報JP 2006-6823 A 特開２００５−２３９０７４公報Japanese Patent Laid-Open No. 2005-239074

特許文献１等の開示発明は、発泡体ｇ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、例えば図７のごとくステー脚部２０の上端部及び横架部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(以下、「後突」という)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８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８(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。 The disclosed invention such as Patent Document 1 discloses a core material from the headrest that has been embedded only in the upper portion of the stay in the foam g to the upper end portion of the stay leg portion 20 and the front surface of the horizontal portion 21 as shown in FIG. e is fixed, and these are used as headrests embedded in the foam g. At the time of rear-end collision (hereinafter referred to as “rear collision”) from behind the vehicle, the force acting on the head HD is delayed compared to the force acting on the back ((A) in FIG. 8). Although it becomes a whip, it prevents a whip by providing the core material e. 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. 8 (b), when a headrest without a core material (conventional product) is used, the displacement that the neck tilts backward is β, whereas in the headrest with the core material, the displacement that the neck tilts backward is as short as α. 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、図７にみられる特許文献１等の芯材ｅをステー２に取着したヘッドレストは、芯材に効果的な衝突エネルギ吸収(以下、「ＥＡ」という)させるのは難しかった。車両の後突等により頭部がヘッドレストに衝突すると、発泡体が潰れ、図８(ロ)のＦ地点から芯材が荷重を受ける。該芯材はリブ等の座屈などで多少変形して衝撃エネルギを吸収するが、ステーと芯材との距離Ｗが近いので十分なストロークが得られず、大きな反発力を頭部に与えることになった。ヘッドレスト（エネルギ吸収体）の反力特性(以下、「ＦＳ特性」という)は、図９に示す目標特性のような、ある許容できる反力まで立ち上がった後これを維持する、矩形波になるのが理想である。乗員頭部への反力を小さく抑えつつ衝突エネルギを吸収するためには、矩形波のストロークを長く確保することが好ましいが、これまでの芯材ではストローク確保が不十分であった。 However, the headrest in which the core e shown in FIG. 7 and the like is attached to the stay 2 is difficult to effectively absorb the collision energy (hereinafter referred to as “EA”). When the head collides with the headrest due to the rear impact of the vehicle, the foam is crushed and the core material receives a load from point F in FIG. The core material is slightly deformed by buckling of ribs, etc., and absorbs impact energy. However, since the distance W between the stay and the core material is short, a sufficient stroke cannot be obtained and a large repulsive force is given to the head. Became. The reaction force characteristic (hereinafter referred to as “FS characteristic”) of the headrest (energy absorber) becomes a rectangular wave that maintains this after rising to a certain allowable reaction force such as the target characteristic shown in FIG. Is ideal. In order to absorb collision energy while keeping the reaction force on the occupant's head small, it is preferable to ensure a long rectangular wave stroke, but the conventional core material has not ensured sufficient stroke.

本発明は、上記問題点を解決するもので、衝突エネルギを吸収するストロークに、従来にない長さを確保して、衝突エネルギを効果的に吸収できる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-described problems, and provides a headrest and a headrest base material that can effectively absorb collision energy by ensuring a length that is not conventionally provided in a stroke that absorbs collision energy. Objective.

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横架部で連結されたステーと、前板部が該横架部との間にエネルギ吸収用空間をとって配され、且つ底板部の後端縁を該各脚部に嵌合させて、一定以上の作用力が印加した時に、該後端縁の嵌合部位を支点に後方へ回動できるようにステーの上部に取付けられた芯材と、該芯材よりも変形容易にして前記空間に配設されるエネルギ吸収体と、を具備す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、芯材の底板部の後端縁を、前記一定以上の作用力が印加した時に前記各脚部の下方へ摺動できるように該各脚部に嵌合したことを特徴とする。請求項３の発明たるヘッドレスト用基材は、請求項１又は２で、芯材の底板部の後端縁に一対の切欠きを形成して嵌合凹部となし、これら嵌合凹部をそれぞれ前記脚部の外周に前方から嵌め込んだことを特徴とする。請求項４の発明たるヘッドレスト用基材は、請求項２又は３で、脚部に対する前記後端縁の相対上方移動を規制する支柱を、前板部の背面にさらに設けたことを特徴とする。請求項５の発明たるヘッドレスト用基材は、請求項１乃至４で、芯材の底板部の剛性を芯材の他の部分より相対的に高くしたことを特徴とする。
請求項６に記載の発明の要旨は袋状表皮と、一対の脚部の上端部分が横架部で連結されたステーと、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、その前板部と該横架部との間にエネルギ吸収用空間を設け、且つ芯材の底板部の後端縁を該各脚部に嵌合して、一定以上の作用力が印加した時に該後端縁の嵌合部位を支点に後方へ回動できるようにしてステーの上部に取付けられ、さらに前記空間に前記芯材よりも変形容易なエネルギ吸収体が配設されることを特徴とするヘッドレストにある。 In order to achieve the above-mentioned object, the gist of the invention described in claim 1 is that energy is absorbed between a stay in which upper ends of a pair of leg portions are connected by a horizontal portion and a front plate portion between the horizontal portion and the stay. The rear end edge of the bottom plate portion is fitted to each leg portion, and when a working force of a certain level or more is applied, the rear end edge fitting portion is rotated backward using the fitting portion as a fulcrum. A headrest base material comprising: a core member attached to an upper portion of a stay so as to be movable; and an energy absorber disposed in the space so as to be deformed more easily than the core member. .
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 rear end edge of the bottom plate portion of the core member can be slid downwardly of the leg portions when the working force of a certain level or more is applied. It fits to each said leg part, It is characterized by the above-mentioned. 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 first or second aspect, wherein a pair of cutouts are formed in the rear end edge of the bottom plate portion of the core member to form a fitting recess, It is characterized by being fitted into the outer periphery of the leg from the front. A headrest base material according to a fourth aspect of the present invention is the base material for a headrest according to the second or third aspect, further comprising a post for restricting the relative upward movement of the rear end edge with respect to the leg portion on the back surface of the front plate portion. . A base material for a headrest according to a fifth aspect of the present invention is the base material for a headrest according to the first to fourth aspects, wherein the rigidity of the bottom plate portion of the core material is relatively higher than that of other portions of the core material.
The gist of the invention described in claim 6 is a bag-like skin, a stay in which upper ends of a pair of leg portions are connected by a horizontal portion, a core member attached to an upper portion of the stay, an upper portion of the stay, and the stay In a headrest comprising a foam material injected into the skin where the core material is disposed, and foamed and cured by integrating the skin, the stay, and the core material, the core material, When an energy absorbing space is provided between the front plate portion and the horizontal portion, and the rear end edge of the bottom plate portion of the core member is fitted to each leg portion, and an applied force exceeding a certain level is applied. It is attached to the upper part of the stay so that it can be rotated backward with the fitting part of the rear edge as a fulcrum, and further, an energy absorber that is more easily deformable than the core material is disposed in the space. In the headrest to do.

請求項１,請求項６の発明のごとく、前板部が横架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体が配設されると、後突等で横架部と前板部間の距離が近づくことによりエネルギ吸収体に変形が生じる。そして、後突等によって一定以上の作用力が加わると、芯材の底板部の後端縁が各脚部を支点として芯材が後方へ回動して後傾する。これにより、エネルギを吸収しながら長い乗員頭部の移動ストロークを確保することができる。すなわち衝突エネルギを吸収するストロークを長く確保できる。この長いストロークによって、後突時の乗員頭部に働く衝突反力を小さく抑えつつ衝突エネルギが良好に吸収される。長いストロークが確保されることによって、総吸収エネルギが大きくなる。後突時に、首が後傾する変位を短くし、早めに反力を立ててむち打ち低減を図るにとどまらず、衝突エネルギを吸収するストロークを長くして、乗員頭部の確実な保護が図れるようになる。
請求項２の発明においては、車両衝突によって一定以上の作用力が加わると、芯材の底板部の後端縁は各脚部に対しこれに沿って下方へ移動する。該芯材の回動による後傾に加えて、該底板部の後端縁の下方移動による芯材の下降により、エネルギ吸収用空間の距離に比べて長い乗員頭部の移動ストロークが得られる。この長い移動ストロークによって、衝突エネルギが良好に吸収される。
請求項３の発明のごとく、芯材の底板部の後端縁に一対の嵌合凹部を形成してこれらをそれぞれ前記脚部の外周に前方から嵌め込むと、該後端縁の脚部に沿った移動とを可能にする構成が簡易に実現される。
請求項４の発明においては、支柱によって後端縁の下方移動が規制案内されるので、車両衝突で横架部が前板部へ向けて近づく際に、エネルギ吸収体から横架部が外れてしまうことがなく、エネルギ吸収体が確実に変形させられて衝突エネルギの吸収が行われる。
請求項５の発明のごとく、芯材の底板部の剛性を相対的に高くすると、摺動・回転の際に底板部が変形して芯材の摺動・回転の円滑さを損なうことがない。 As in the first and sixth aspects of the invention, when the front plate portion takes a space for absorbing energy between the horizontal portion and the energy absorber is disposed in the space, the rear plate or the like A deformation | transformation arises in an energy absorber, when the distance between a bridge | bridging part and a front board part approaches. When an action force of a certain level or more is applied by a rear impact or the like, the rear end edge of the bottom plate portion of the core member rotates backward with each leg as a fulcrum. Thereby, a long movement stroke of the occupant head can be secured while absorbing energy. That is, a long stroke for absorbing the collision energy can be secured. By this long stroke, the collision energy is satisfactorily absorbed while suppressing the collision reaction force acting on the passenger's head at the time of the rear collision. By ensuring a long stroke, the total absorbed energy increases. At the time of a rear impact, the rearward displacement of the neck is shortened, the reaction force is raised early to reduce whiplash, and the stroke that absorbs collision energy is lengthened so that the occupant's head can be reliably protected. become.
In the invention of claim 2, when an action force of a certain level or more is applied due to a vehicle collision, the rear end edge of the bottom plate portion of the core member moves downward along each leg portion. In addition to the backward inclination caused by the pivoting of the core material, the core member descends due to the downward movement of the rear edge of the bottom plate portion, whereby a moving stroke of the occupant's head longer than the distance of the energy absorbing space is obtained. This long travel stroke absorbs the collision energy well.
As in the invention of claim 3, when a pair of fitting recesses are formed in the rear end edge of the bottom plate portion of the core member and these are fitted into the outer periphery of the leg portion from the front, respectively, the leg portion of the rear end edge A configuration that enables movement along the axis is easily realized.
In the invention of claim 4, since the downward movement of the rear end edge is regulated and guided by the support column, when the horizontal portion approaches the front plate portion due to a vehicle collision, the horizontal portion is detached from the energy absorber. The energy absorber is reliably deformed and the collision energy is absorbed.
As in the invention of claim 5, when the rigidity of the bottom plate portion of the core material is relatively increased, the bottom plate portion is not deformed during sliding / rotation and the smoothness of sliding / rotation of the core material is not impaired. .

本発明のヘッドレスト及びヘッドレスト用基材は、後突等の衝撃を受けた時に、芯材が後端縁の嵌合部位を支点に後方へ回動しながら衝突エネルギを吸収することで、エネルギ吸収のためのストローク長さを稼ぐことができ、後突時等における乗員頭部の保護に優れた効果を発揮する。 The headrest and the headrest base material of the present invention absorb energy by absorbing the collision energy while rotating backward with the fitting part of the rear edge as a fulcrum when receiving an impact such as a rear collision. The stroke length for can be earned and the effect which was excellent in protection of a passenger | crew head at the time of a rear collision etc. is exhibited.

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６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はそのヘッドレスト用基材の全体斜視図、図２は（イ）が図１のヘッドレスト用基材を組み込んだヘッドレストの断面で、（ロ）が（イ）の状態から後突後の説明断面図である。図３は後突時におけるエネルギ吸収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はエネルギ吸収用空間に設けたエネルギ吸収体の説明断面図である。図５は図１〜図３に代わる他態様のヘッドレスト用基材及びヘッドレストの説明断面図、図６は図５のヘッドレスト用基材を用いた場合の、後突時におけるエネルギ吸収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。図３,図４,図６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 6 show one embodiment of the headrest and the headrest base material of the present invention. FIG. 1 is an overall perspective view of the headrest base material, and FIG. 2 is a headrest base of FIG. It is a section of a headrest incorporating a material, and (B) is an explanatory sectional view after a rear collision from the state of (A). FIG. 3 is an explanatory cross-sectional view of the headrest showing the relationship between the energy absorption stroke and the energy absorption space at the time of rear collision, and FIG. 4 is an explanatory cross-sectional view of the energy absorber provided in the energy absorption space. FIG. 5 is an explanatory sectional view of a headrest base material and a headrest according to another embodiment instead of FIGS. 1 to 3, and FIG. 6 is an energy absorption stroke and energy absorption at the time of a rear impact when the headrest base material of FIG. 5 is used. It is explanatory sectional drawing of the headrest which showed the relationship of work space. In FIG. 3, FIG. 4, and 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と案内部材としての支柱４とエネルギ吸収体５とを備える。ステー２は公知の頑強な金属製品で、一対の脚部２０を平行に配設し、両脚部２０の上端部分２０ａを横架部２１で結ぶステー２とする。ここでは、図１のごとく金属製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及び横架部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) Headrest Base Material The headrest base material 1 includes a stay 2, a core material 3, a support column 4 as a guide member, and an energy absorber 5. The stay 2 is a well-known robust metal product, and a pair of leg portions 20 are arranged in parallel, and the upper end portion 20 a of both the leg portions 20 is connected by the horizontal portion 21. Here, as shown in FIG. 1, a metal cylinder or pipe is bent into a U shape to form the leg portion 20 and the horizontal 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が前記横架部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が後方へ延びている。底板部３２の後端縁３２ｄ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。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ていて、一対のステー脚部２０の上部を嵌合凹部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）。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が抜け出るのを防ぐ。底板部３２の後端縁３２ｄを該各脚部２０に嵌合させて、芯材３は、一定以上の作用力が印加した時に、該後端縁の嵌合部位を支点に後方へ回動できるようにステーの上部に取付けられる。後端縁３２ｄの嵌合部位では、嵌合凹部３２ｂをそれぞれ脚部２０の外周に前方から嵌め込んで、一定以上の作用力が印加した時に、横架部２１と前板部３０間の距離Ｌを縮めるようにして、後端縁３２ｄを各脚部２０に相対下方移動可能にかつ芯材が回動可能なように嵌合する。ここで、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。
後突時に、芯材３は底板部後端縁３２ｄの左右の嵌合凹部３２ｂを結ぶ線を中心に後傾し、さらに各ステー脚部２０に沿って下方へ摺動可能にする。 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 horizontal portion 21, and projects forward. (FIGS. 1 and 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 backward from the lower edge of the front plate 30 to the leg 20 side (rear side). The rear end edge 32 d of the bottom plate portion 32 is provided with a fitting recess 32 b that is notched on both sides and is fitted into the pair of stay leg portions 20. The widths of the front plate portion 30 and the bottom plate portion 32 relating to the core material 3 are made slightly larger than the distance between the pair of leg portions 20, and the upper portions of the pair of stay leg portions 20 are inserted into the fitting recesses 32b. Then, the core material 3 is fitted and locked to the two leg portions 20 (FIG. 1). A locking claw 32c is provided at the introduction port portion that forms the fitting recess 32b to prevent the leg 20 inserted into the fitting recess 32b from coming out. The rear end edge 32d of the bottom plate portion 32 is fitted to the respective leg portions 20, and the core material 3 is rotated backward with the fitting portion of the rear end edge as a fulcrum when an action force of a certain level or more is applied. Mounted on top of stay as possible. At the fitting portion of the rear end edge 32d, the distance between the horizontal portion 21 and the front plate portion 30 when the fitting concave portion 32b is fitted into the outer periphery of the leg portion 20 from the front and an acting force of a certain level or more is applied. L is contracted so that the rear end edge 32d is fitted to each leg portion 20 so that the rear end edge 32d can move relatively downward and the core can rotate. Here, in the headrest and the headrest base material 1 attached to the seat back upper end 921 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 side is The upward direction from the bottom plate portion 32 toward the upper plate portion 33 (upward in the drawing in FIG. 3), and horizontal means the direction of the plate surface of the bottom plate portion 32 (in the direction perpendicular to the drawing in FIG. 3).
At the time of rear collision, the core member 3 is tilted rearward about a line connecting the left and right fitting recesses 32b of the rear end edge 32d of the bottom plate portion, and further slidable downward along each stay leg portion 20.

そして、芯材３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、椀状にして剛性のある部材とする(図１,図２)。底板部３２は芯材３の他の部分よりも厚肉にしてその剛性を高める。さらに剛性を高めるべく、後端縁３２ｄの嵌合部位から前板部３０へ向かう底板部３２上に補強リブ３４を設ける。
本発明は、特許文献１,２のように芯材３に後突時のエネルギ吸収を原則負わせない。後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を特に行わず、本発明はエネルギ吸収を専らエネルギ吸収体５に担わせる。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、エネルギ吸収体５に伝達する。
前板部３０の上部が横架部２１よりも上方に突き出すようにして、例えば図１〜図３のごとく前板部３０の約１／２の高さ地点で、横架部２１が水平に配されるようにする。そして、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横架部２１に掛止して、前板部３０と横架部２１との間にエネルギ吸収用空間６が確保され、ここにエネルギ吸収体５を配する構造とする。芯材３は、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 core member 3 includes a bottom plate portion 32, an upper plate portion 33 that bends from the upper edge of the front plate portion 30 to the leg portion side, and both side plate portions 31 that are bent from both side edges of the front plate portion 30 to the leg portion side. Then, the back plate 30b of the front plate portion 30 is surrounded and formed into a bowl-like and rigid member (FIGS. 1 and 2). The bottom plate portion 32 is thicker than the other portions of the core material 3 to increase its rigidity. In order to further increase the rigidity, a reinforcing rib 34 is provided on the bottom plate portion 32 from the fitting portion of the rear end edge 32d toward the front plate portion 30.
In the present invention, as in Patent Documents 1 and 2, the core material 3 is not subjected to energy absorption at the time of rear collision in principle. In order to prevent a difference in performance depending on the hitting position and angle at the time of a vehicle collision such as a rear collision, the core material 3 serving as the pressure receiving surface is not particularly deformed or EA, and the present invention exclusively takes energy absorption to the energy absorber 5. . The impact force of the collision is transmitted to the energy absorption space 6 and the energy absorber 5 provided on the back side of the core material 3.
The upper portion of the front plate portion 30 protrudes upward from the horizontal portion 21 so that the horizontal portion 21 is horizontally arranged at a height point of about ½ of the front plate portion 30 as shown in FIGS. To be distributed. And hook 42 provided in tip part 41 of pillar 4 standing upright on core material 3 is hooked on horizontal part 21 arranged horizontally, and between front board part 30 and horizontal part 21 The space 6 for energy absorption is secured in this, and the energy absorber 5 is arranged here. The core material 3 is attached to the stay 2 using the fitting recess 32b and the support column 4.

支柱４は底板部３２の後端縁３２ｄが嵌合した脚部２０に対し、後端縁３２ｄの相対上方移動を規制する案内部材である(図１)。支柱４は前板部３０の背面３０ｂに立設する柱状体で、ここでは芯材３と一体成形で設ける。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。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横架部２１に、上板部３３側の上方から当接する（図２）。支柱４には先端部分４１に鉤状フック４２が設けられ、該フック４２を横架部２１に掛止できる構成にする。フック４２を横架部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が横架部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にエネルギ吸収体５が配設される。 The support column 4 is a guide member that regulates the relative upward movement of the rear end edge 32d with respect to the leg portion 20 with which the rear end edge 32d of the bottom plate portion 32 is fitted (FIG. 1). The support column 4 is a columnar body standing on the back surface 30 b of the front plate portion 30, and is provided here by integral molding with the core material 3. When the headrest is attached to the seat back upper end 921, the column main body 40 of the support column 4 rises from the substantially vertical surface area of the front plate back surface 30b toward the rear of the vehicle. The front end portion of the support column 4 comes into contact with the horizontal portion 21 that is horizontally disposed by attaching the core member 3 to the stay 2 from above the upper plate portion 33 side (FIG. 2). The column 4 is provided with a hook-like hook 42 at the tip portion 41 so that the hook 42 can be hooked on the horizontal portion 21. By hooking the hook 42 to the horizontal 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 horizontal portion 21 and the core. The material 3 is stably held on the stay 2 with three points. Thus, the energy absorber 5 is disposed in the space 6.

エネルギ吸収体５は芯材３よりも変形容易な部材で、前板部３０と横架部２１との間の前記空間６に配設されて後突等の衝撃エネルギを吸収する部材である。エネルギ吸収体５は、芯材３と横架部２１とに挟まれるように配され、衝突エネルギを受けた際、芯材３よりも先に変形、さらには破壊されて衝突エネルギを吸収できる。斯かるエネルギ吸収体５であればその材質,形状等は問わない。例えば、図４(イ),(ロ)の硬質ウレタンブロック等からなる硬質発泡プラスチックのブロック体、図４(ハ)の一対の立板部５１の先端部分が天板部５２で結合された側面視略コ字状の樹脂製又は金属製成形品、図４(ニ)の縦リブ５８ａと横リブ５８ｂとの格子状体５８に天板部５２を一体化させた構造体ブロック,図４(ホ)のゴムやゲルなどの非線形材料からなるものなどがある。また、エネルギ吸収体５は芯材３の背面３０ｂに一体に成形されたものであってもよく、例えば、芯材３の背面３０ｂに該芯材の前板部３０より薄肉に成形された縦リブおよび横リブよりなる格子状体でもよい。硬質発泡プラスチックのブロック体は、衝突等で破壊吸収によって再生不能となるが、衝撃吸収を円滑に進めることができる。図４(ハ)の側面視略コ字状成形品は、立板部５１の曲げ変形によって衝突エネルギを効率良く吸収する。
前板部３０と横架部２１に挟まれるようにして空間６に配されるエネルギ吸収体５は、図３のごとく後突等によって変形、さらには破壊されて、横架部２１と前板部３０間の距離Ｌが縮まるストローク過程でエネルギ吸収する。図４(ロ)〜図４(ニ)のエネルギ吸収体５では、面積が小さく且つ曲面になっている横架部２１からの衝撃力でも確実に受け止められるよう、横架部２１と当接する天板部５２,天部５ａの機械的強度を強めて、よりエネルギ吸収し易くする。なお、図４(ハ),(ニ)等からなるエネルギ吸収体５では、後突等によってその距離Ｌが縮まった際に、ヘッドレストの発泡成形で空間６内に充填された発泡体８の反力が立たないように通孔３０ｆが前板部３０に設けてある。ゴムやゲルなどの非線形材料等からなるエネルギ吸収体５では、後突等によってその距離Ｌが縮まった際に、エネルギ吸収体５の反力が立たないように通孔３０ｆが前板部３０に設けてある。 The energy absorber 5 is a member that is easier to deform than the core material 3 and is a member that is disposed in the space 6 between the front plate portion 30 and the horizontal portion 21 and absorbs impact energy such as a rear impact. The energy absorber 5 is disposed so as to be sandwiched between the core material 3 and the horizontal portion 21, and when receiving the collision energy, the energy absorber 5 is deformed and destroyed before the core material 3 and can absorb the collision energy. If it is such an energy absorber 5, the material, shape, etc. will not ask | require. For example, a hard foamed plastic block body made of a hard urethane block or the like in FIGS. 4 (a) and 4 (b), and a side surface in which the tip portions of the pair of standing plate portions 51 in FIG. Resin or metal molded product having a generally U-shape, a structure block in which the top plate 52 is integrated with the lattice-like body 58 of the vertical ribs 58a and the horizontal ribs 58b shown in FIG. E) made of non-linear materials such as rubber and gel. Further, the energy absorber 5 may be integrally formed on the back surface 30b of the core material 3. For example, the energy absorber 5 is formed vertically on the back surface 30b of the core material 3 so as to be thinner than the front plate portion 30 of the core material. It may be a lattice-like body made of ribs and lateral ribs. The block body of hard foamed plastic cannot be regenerated due to damage absorption due to collision or the like, but can absorb shock smoothly. The substantially U-shaped molded product in a side view of FIG. 4C efficiently absorbs collision energy by bending deformation of the upright plate portion 51.
The energy absorber 5 disposed in the space 6 so as to be sandwiched between the front plate portion 30 and the horizontal portion 21 is deformed or destroyed by a rear impact or the like as shown in FIG. Energy is absorbed in the stroke process in which the distance L between the portions 30 is reduced. In the energy absorber 5 shown in FIGS. 4 (b) to 4 (d), the ceiling abutting against the horizontal portion 21 is securely received even by the impact force from the horizontal portion 21 having a small area and a curved surface. The mechanical strength of the plate portion 52 and the top portion 5a is increased to facilitate energy absorption. 4 (c), (d), etc., when the distance L is reduced by a rear impact or the like, the foam 8 filled in the space 6 is foamed by a headrest. A through hole 30f is provided in the front plate portion 30 so that no force is generated. In the energy absorber 5 made of a non-linear material such as rubber or gel, the through hole 30f is formed in the front plate portion 30 so that the reaction force of the energy absorber 5 does not stand when the distance L is reduced by a rear impact or the like. It is provided.

ここで、図４(ハ),(ニ)等からなるエネルギ吸収体５を用いる場合、前記通孔３０ｆを設ける代わりに、図５,図６のような他態様のヘッドレスト用基材を採用することもできる。図５のヘッドレスト用基材１は、図１の芯材３を内面側が凹む椀状前部半割り材３ａとして、これと対になる後部半割り材３ｂをさらに設ける。図５のヘッドレスト用基材１は、芯材３を構成する両半割り材３ａ,３ｂの接合により、ステーの上部２ａを包み込んで該上部に取り付けられ、発泡成形過程で発泡原料の侵入阻止できる中空部３ｄを形成する。図５の芯材３は前部半割り部材３ａと後部半割り部材３ｂとが薄肉状のヒンジ部ＨＮを介して一体成形されている。前板部３０に通孔３０ｆを設けなくても、中空部ｄ内に発泡原料が侵入しないため、エネルギ吸収体５はその機能を存分に発揮できる。図５のヘッドレスト用基材１に用いるエネルギ吸収体５は図４(ハ),(ニ)のものに勿論限定されない。ここでのエネルギ吸収体５は、図４(イ)の硬質発泡プラスチックのブロック体を用いている。 Here, in the case of using the energy absorber 5 made of FIGS. 4 (c), (d), etc., instead of providing the through hole 30f, other embodiments of headrest base materials as shown in FIGS. 5 and 6 are adopted. You can also. The headrest base material 1 in FIG. 5 further includes a rear half material 3b paired with the core material 3 in FIG. 1 as a bowl-shaped front half material 3a in which the inner surface side is recessed. The headrest base material 1 shown in FIG. 5 wraps and attaches to the upper part 2a of the stay by joining the two half-split members 3a and 3b constituting the core material 3, and can prevent the foaming raw material from entering during the foam molding process. A hollow portion 3d is formed. In the core member 3 of FIG. 5, a front half member 3a and a rear half member 3b are integrally formed through a thin hinge portion HN. Even if the front plate portion 30 is not provided with the through holes 30f, the foaming raw material does not enter the hollow portion d, so that the energy absorber 5 can fully perform its function. Of course, the energy absorber 5 used in the headrest substrate 1 of FIG. 5 is not limited to that shown in FIGS. Here, the energy absorber 5 uses the block body of hard foam plastic shown in FIG.

図５のヘッドレスト用基材１では、また前記支柱４のフック４２に代えて後部半割り材３ｂの内面に突出部３９を設け、両半割り材３ａ,３ｂの接合により突出部３９とエネルギ吸収体５の天面５２ａとで横架部２１を係止する。突出部３９に窪み３９１、また天面５２ａに凹み部分５２ｂを形成し、横架部２１の係止をより確実なものにする。他の構成は図１〜図４のヘッドレスト用基材と同様で、その説明を省く。図中、図１〜図４のヘッドレスト用基材と同一符号は同一又は相当部分を示す。図１〜図４のヘッドレスト用基材１、また図５,図６のヘッドレスト用基材１は、図３、図６のごとくヘッドレスト内に内蔵され、後突時の乗員頭部ＨＤに働く衝突エネルギを効果的に吸収する。 In the headrest substrate 1 of FIG. 5, a protrusion 39 is provided on the inner surface of the rear half member 3b instead of the hook 42 of the support column 4, and the protrusion 39 and the energy absorption are achieved by joining both the half members 3a and 3b. The horizontal portion 21 is locked with the top surface 52 a of the body 5. A recess 391 is formed in the projecting portion 39 and a recessed portion 52b is formed in the top surface 52a, thereby securing the horizontal portion 21 more securely. Other configurations are the same as those of the headrest substrate of FIGS. In the figure, the same reference numerals as those of the headrest base material in FIGS. The headrest base material 1 shown in FIGS. 1 to 4 and the headrest base material 1 shown in FIGS. 5 and 6 are built in the headrest as shown in FIGS. Absorb energy effectively.

次に、図３、図６を用いて、後突時の乗員頭部ＨＤに働く衝突エネルギ(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。
後突された際、例えば目標荷重となる600[Ｎ]前後といった低い荷重で、エネルギ吸収体５を変形さらには破壊させるが、効果的にＥＡを行うには、そのエネルギ吸収のためのストロークを稼ぐ必要がある。
図３のヘッドレスト用基材１では、既述のごとく横架部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と横架部２１との間にエネルギ吸収用空間６が設けられる。芯材３の上部(ここでは上半部)が横架部２１よりも上方へ突き出すようにして、該横架部２１が芯材３の背面側で水平に配され、且つ脚部２０上を芯材３に係る嵌合凹部３２ｂの嵌合部位が摺動可能であるので、後突されると、該嵌合部位が脚部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に近接した地点から、エネルギ吸収体５が変形しエネルギを吸収していく。これと並行して、嵌合部位を支点に芯材３が回転し、さらには脚部２０を嵌合部位が摺動しながら該芯材３が鎖線のごとく後傾する。
後突されると、既述のごとく嵌合凹部３２ｂが脚部２０を下方へ摺動変位しながら、芯材３はこの摺動変位点を支点に回転変位するが、嵌合凹部３２ｂの下方摺動は支柱４に上方摺動を規制されつつ案内される。この摺動・回転の際に、芯材３の底板部３２はその肉厚を厚くして剛性を高めているので、底板部３２が変形して摺動・回転の円滑さを損なうという問題は生じない。
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までの距離がエネルギ吸収体５のストローク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に比べて長いエネルギ吸収体５のストロークＡＬが確保される。この長いストロークＡＬを稼ぐことによって、追突時の乗員頭部ＨＤに働く衝突反力を良好に吸収する。 Next, the structure for effectively absorbing the collision energy (relative kinetic energy) acting on the occupant head HD at the time of the rear collision will be described in more detail with reference to FIGS.
When the rear impact occurs, the energy absorber 5 is deformed or destroyed with a low load such as a target load of about 600 [N]. However, in order to effectively perform EA, a stroke for absorbing the energy is used. I need to earn.
In the headrest base material 1 of FIG. 3, as described above, the hook 42 is hooked to the horizontal portion 21, and the fitting recess 32 b is fitted to the stay leg portion 20 so that the core member 3 is attached to the stay 2. It has been. An energy absorbing space 6 is provided between the front plate portion 30 and the horizontal portion 21. The upper part (here, the upper half part) of the core material 3 projects upward from the horizontal part 21, the horizontal part 21 is horizontally arranged on the back side of the core material 3, and the leg part 20 is Since the fitting part of the fitting recess 32b according to the core material 3 is slidable, when the rear part is bumped, the core part 3 is slid and displaced while the fitting part slides and displaces the leg part 20. The point can be rotated and displaced as shown 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 a point close to the core interference position Y, the energy absorber 5 is deformed and absorbs energy. In parallel with this, the core material 3 rotates with the fitting part as a fulcrum, and further, the core material 3 tilts backward like a chain line while the fitting part slides on the leg portion 20.
When rearwardly bumped, the core 3 is rotationally displaced with the sliding displacement point as a fulcrum while the fitting recess 32b slides and displaces the leg 20 downward as described above. The sliding is guided by the column 4 while the upward sliding is restricted. At the time of sliding / rotating, the bottom plate portion 32 of the core material 3 is thickened to increase the rigidity, so that the problem that the bottom plate portion 32 is deformed and the smoothness of sliding / rotation is impaired is the problem. Does not occur.
Thus, due to this backward inclination of the core material 3, the distance from the core material interference position Y to the full stroke position Z that reaches the core material 3 inclined backward from the chain line becomes the stroke AL of the energy absorber 5. In the headrest substrate 1, the stroke AL of the energy absorber 5 that is longer than the distance L of the energy absorbing space 6 is ensured. By earning this long stroke AL, the collision reaction force acting on the occupant head HD at the time of rear-end collision is absorbed well.

また、図６のヘッドレスト用基材１が後突時の乗員頭部ＨＤに働く衝突エネルギ(相対的な運動エネルギ)を効果的に吸収する構造を説明する。芯材３の上部が横架部２１よりも上方へ突き出すようにして、該横架部２１が芯材３の背面側(内面側)で水平に配される。横架部２１が突出部３９とエネルギ吸収体５の天面５２ａとに挟着,係止され、またステー脚部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。前板部３０と横架部２１との間にエネルギ吸収用空間６が設けられ、該空間にエネルギ吸収体５を配設する。
後突されると、エネルギ吸収体５が芯材３よりも変形し易いため、図６の実線状態から図６の鎖線状態へと変化する。芯材３は嵌合凹部３２ｂを支点に同図鎖線のごとく回転し、また該嵌合凹部は脚部２０を下方へ摺動する。嵌合凹部３２ｂの下方摺動は支柱４に上方摺動を規制されつつ案内される。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に近接した地点から、エネルギ吸収体５が変形してエネルギ吸収していく。これと並行して、嵌合凹部３２ｂを支点に芯材３が回転し、さらには脚部２０を嵌合凹部３２ｂが摺動して、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までの距離がエネルギ吸収体５のストローク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に比べて長いエネルギ吸収体５のストロークＡＬが確保される。この長いストロークＡＬを稼ぐことによって、追突時の乗員頭部ＨＤに働く相対的な運動エネルギを効果的に吸収する。 A structure in which the headrest base 1 in FIG. 6 effectively absorbs collision energy (relative kinetic energy) acting on the occupant head HD at the time of rear collision will be described. The horizontal portion 21 is horizontally arranged on the back side (inner surface side) of the core material 3 so that the upper portion of the core material 3 protrudes upward from the horizontal portion 21. The horizontal part 21 is clamped and locked between the projecting part 39 and the top surface 52a of the energy absorber 5, and the fitting recess 32b is fitted to the stay leg part 20 so that the core member 3 is attached to the stay 2. It is done. An energy absorption space 6 is provided between the front plate portion 30 and the horizontal portion 21, and the energy absorber 5 is disposed in the space.
When rearwardly impacted, the energy absorber 5 is more easily deformed than the core material 3, so that the state changes from the solid line state of FIG. 6 to the chain line state of FIG. 6. The core member 3 rotates as indicated by a chain line in FIG. 5 with the fitting recess 32b as a fulcrum, and the fitting recess slides downward on the leg portion 20. The downward sliding of the fitting recess 32b is guided by the support column 4 while the upward sliding is restricted. 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 a point close to the core interference position Y, the energy absorber 5 is deformed and absorbs energy. In parallel with this, the core member 3 rotates with the fitting recess 32b as a fulcrum, and the fitting recess 32b slides on the leg portion 20, and the core member 3 tilts backward like a chain line.
Thus, due to this backward inclination of the core material 3, the distance from the core material interference position Y to the full stroke position Z that reaches the core material 3 inclined backward from the chain line becomes the stroke AL of the energy absorber 5. In the headrest substrate 1, the stroke AL of the energy absorber 5 that is longer than the distance L of the energy absorbing space 6 is ensured. By earning this long stroke AL, the relative kinetic energy acting on the occupant head HD at the time of rear-end collision is effectively absorbed.

（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３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と横架部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。前板部３０の上部が横架部２１よりも上方に突き出すように配する。芯材３は、その底板部３２の後端縁３２ｄを各脚部２０に嵌合して、一定以上の作用力が印加した時に該後端縁の嵌合部位を支点に後方へ回動できるようにしてステー２の上部２ａに取付けられる。そして、前記空間６に芯材３よりも変形容易なエネルギ吸収体５が配設される。芯材３の底板部３２は後端縁３２ｄが、一定以上の作用力が印加した時に芯材が前記各脚部２０に対し後方へ回動できるように該各脚部２０に結合されており、車両衝突で横架部２１と前板部３０間の距離Ｌが近づくことによりエネルギ吸収体５に変形又は破壊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. , And a foam 8 that is foam-cured and integrated with the stay and the core material 3, 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 outer 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 horizontal portion 21. It arrange | positions so that the upper part of the front board part 30 may protrude upwards rather than the horizontal part 21. FIG. The core member 3 can be fitted to the rear end edges 32d of the bottom plate portion 32 to the respective leg portions 20, and can be rotated rearward with the rear end edge fitting portion as a fulcrum when an applied force of a certain level or more is applied. In this way, it is attached to the upper part 2a of the stay 2. An energy absorber 5 that is easier to deform than the core material 3 is disposed in the space 6. The bottom plate portion 32 of the core material 3 has a rear end edge 32d coupled to each leg portion 20 so that the core material can be rotated rearward with respect to each leg portion 20 when an applied force of a certain level or more is applied. The headrest is configured such that the energy absorber 5 is deformed or broken when the distance L between the horizontal portion 21 and the front plate portion 30 approaches in a vehicle collision.

袋状表皮７は図１〜図３、図５に示すごとくの枕状に形成され、底面部７２には発泡原料注入口、ステー用孔が設けられる。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、支柱４が脚部２０に対する後端縁３２ｄの相対上方移動を規制しており、嵌合凹部３２ｂがステー脚部２０の下方へ向けて摺動する。ステー横架部２１がエネルギ吸収用空間６内の図２(イ)から図２(ロ)へと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。
ヘッドレスト用基材１,ステー２,芯材３,支柱４,エネルギ吸収体５,エネルギ吸収用空間６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。 The bag-like skin 7 is formed in a pillow shape as shown in FIGS. 1 to 3 and 5, and the bottom portion 72 is provided with a foam raw material inlet and a stay hole. 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 absorption space 6 is provided in the headrest, and an energy absorber 5 is disposed in the space 6 to absorb collision energy. At the time of a vehicle collision (EA operation), the support column 4 restricts the relative upward movement of the rear end edge 32d with respect to the leg portion 20, and the fitting recess 32b slides downward of the stay leg portion 20. A support column 4 is provided to guide the stay horizontal part 21 so as to pass through a specific track from FIG. 2 (a) to FIG. 2 (b) in the energy absorbing space 6, so that the collision energy can be absorbed stably. I have to.
The headrest base 1, stay 2, core 3, support column 4, energy absorber 5, energy absorption space 6, etc. are the same as those described in the section of (1) Headrest Base 1, and their explanations are as follows. Omit. 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１は、空間６に配設されるエネルギ吸収体５が横架部２１及び芯材３よりも変形容易であるので、後突時に、横架部２１と前板部３０間の距離Ｌが縮まり、エネルギ吸収体５が変形して円滑にエネルギ吸収する。そして、芯材３は底板部３２の後端縁３２ｄを該各脚部２０に嵌合させて、後突等の外力、すなわち一定以上の作用力が印加した時に、該後端縁の嵌合凹部３２ｂを支点に後方へ回動できるようにしているので、エネルギ吸収するためにストロークを稼げるようになり、効果的なエネルギ吸収ができる。特に、芯材３の上部が横架部２１よりも上方へ突き出すように配設されると、後端縁３２ｄの嵌合部位を支点に後方へ回動できる角度を大きくできる。芯材３が横架部２１よりも上方へ突き出す分、エネルギ吸収体のストロークを長く設定でき、エネルギ吸収に一段と効果を上げる。後突時等において、芯材３を横架部２１の前方に張出し早めに反力を立て、首が後傾する変位を短くし、むち打ち低減を図るにとどまらず、衝突エネルギを吸収するストロークが従来になく長く設定できることで、乗員頭部の確実な保護が図れるようになる。安全性向上に優れた効果を発揮する。
また、芯材３の底板部３２の後端縁３２ｄを、一定以上の作用力が印加した時に各脚部２０の下方へ摺動できるように該各脚部に嵌合させているので、前記図３,図６での説明のごとく、エネルギ吸収体のストロークをより長くすることができる。衝突エネルギのより効果的な吸収が可能になる。横架部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、後突の衝突エネルギを受けた際、芯材３を回転,摺動させることによって、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。
さらに、支柱４が脚部２０に対する前記後端縁３２ｄの相対上方移動を規制して、芯材３の底板部３２の後端縁３２ｄを、一定以上の作用力が印加した時に各脚部２０の下方へ摺動するのを促すので、衝突エネルギのより確実な吸収ができる。
加えて、微小曲面をもつステー２に対しても、該ステー２からの後突反力をエネルギ吸収体５の天面５２ａの部分に強度をもたせて、該エネルギ吸収体の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。 (3) Effect Since the energy absorber 5 disposed in the space 6 is easier to deform than the horizontal portion 21 and the core material 3 in the headrest and the headrest base material 1 configured as described above, The distance L between the horizontal portion 21 and the front plate portion 30 is reduced, and the energy absorber 5 is deformed to smoothly absorb energy. Then, the core member 3 has the rear end edge 32d of the bottom plate portion 32 fitted to the respective leg portions 20, and when an external force such as a rear impact, that is, an action force of a certain level or more is applied, the rear end edge is fitted. Since the recess 32b can be rotated backward with the fulcrum as a fulcrum, a stroke can be earned to absorb energy, and effective energy absorption can be achieved. In particular, when the upper portion of the core member 3 is disposed so as to protrude upward from the horizontal portion 21, the angle at which the core member 3 can be rotated backward with the fitting portion of the rear end edge 32d as a fulcrum can be increased. The stroke of the energy absorber can be set longer by the amount that the core material 3 protrudes upward from the horizontal portion 21, and the effect is further improved in energy absorption. At the time of a rear impact, the core material 3 is projected to the front of the horizontal portion 21, and a reaction force is established as soon as possible to shorten the displacement that the neck tilts backward, reducing not only the whip but also the stroke that absorbs the collision energy. Since it can be set longer than before, the occupant's head can be reliably protected. Demonstrates excellent safety improvement.
Further, since the rear end edge 32d of the bottom plate portion 32 of the core member 3 is fitted to each leg portion so that it can slide below each leg portion 20 when an applied force of a certain level or more is applied, As described in FIGS. 3 and 6, the stroke of the energy absorber can be made longer. More effective absorption of collision energy is possible. While hooking the hook 42 of the support column 4 to the horizontal frame portion 21, the core recess 3 b is fitted to the stay leg portion 20 and the core member 3 is attached to the stay 2. By rotating and sliding the core 3, the headrest and headrest can be handled with a space 6 for absorbing energy smaller than the required stroke as shown in FIG. The base material 1 is used.
Furthermore, when the support column 4 restricts the relative upward movement of the rear end edge 32d with respect to the leg portion 20 and a working force of a certain level or more is applied to the rear end edge 32d of the bottom plate portion 32 of the core member 3, each leg portion 20 is operated. It is possible to absorb the collision energy more reliably.
In addition, with respect to the stay 2 having a minute curved surface, the rear impact force from the stay 2 is given strength to the top surface 52a of the energy absorber 5, and the energy is absorbed by deformation of the energy absorber. Since it absorbs, stable and effective energy absorption can be performed.

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, and the like of the headrest base material 1, stay 2, core material 3, support column 4, energy absorber 5, energy absorption space 6, skin 7, foam 8 and the like can be appropriately selected according to the application. .

本発明のヘッドレスト用基材の一形態で、その全体斜視図である。It is one form of the base material for headrests of the present invention, and is the whole perspective view. （イ）が図１のヘッドレスト用基材を組み込んだヘッドレストの断面で、（ロ）が（イ）の状態から後突後の説明断面図である。(A) is a cross section of the headrest incorporating the headrest base material of FIG. 1, and (b) is an explanatory cross-sectional view after the rear impact from the state of (b). 後突時におけるエネルギ吸収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 energy absorption stroke at the time of a rear collision, and the space for energy absorption. エネルギ吸収用空間に設けたエネルギ吸収体の説明断面図である。It is explanatory sectional drawing of the energy absorber provided in the space for energy absorption. 図１〜図３に代わる他態様のヘッドレスト用基材及びヘッドレストの説明断面図である。It is explanatory drawing sectional drawing of the base material for headrests and the headrest of the other aspect which replaces FIGS. 図５のヘッドレスト用基材を用いた場合の、後突時におけるエネルギ吸収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。FIG. 6 is an explanatory cross-sectional view of the headrest showing the relationship between the energy absorption stroke and the energy absorption space at the time of rear collision when the headrest base material of FIG. 5 is used. 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.

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横架部
３芯材
３０前板部
３０ｂ背面(内面)
３２底板部
３２ｂ嵌合凹部
３２ｄ後端縁
４支柱
４１フック
５エネルギ吸収体
６エネルギ吸収用空間(空間)
７表皮
８発泡体
Ｌ横架部と前板部間の距離 DESCRIPTION OF SYMBOLS 1 Headrest base material 2 Stay 20 Leg part 20a Upper end part 21 Horizontal part 3 Core material 30 Front plate part 30b Back surface (inner surface)
32 Bottom plate portion 32b Fitting recess 32d Rear edge 4 Post 41 Hook 5 Energy absorber 6 Energy absorbing space (space)
7 Skin 8 Foam L Distance between horizontal part and front plate part

Claims

A stay in which the upper end portions of the pair of leg portions are connected by a horizontal portion and a front plate portion are arranged with an energy absorbing space between the horizontal portion and the rear end edge of the bottom plate portion. A core member attached to the upper portion of the stay so that the leg member can be rotated backward with the fitting part of the rear end edge as a fulcrum when an applied force of a certain level or more is applied to the leg portion; And an energy absorber disposed in the space in a more easily deformable manner.

2. The headrest according to claim 1, wherein a rear end edge of the bottom plate portion of the core member is fitted to each leg portion so as to be slidable downward of each leg portion when the predetermined force or more is applied. Base material.

The pair of notches are formed in the rear end edge of the bottom plate portion of the core member to form fitting recesses, and the fitting recesses are fitted into the outer circumferences of the leg portions from the front, respectively. Base material for headrest.

The base material for headrests of Claim 2 or 3 which further provided the support | pillar which controls the relative upward movement of the said rear-end edge with respect to the said leg part in the back surface of the front board part.

The base material for headrests in any one of Claims 1 thru | or 4 which made the rigidity of the baseplate part of the said core material relatively higher than the other part of the core material.

A bag-like skin, a stay in which the upper ends of a pair of legs are connected by a horizontal part, a core attached to the upper part of the stay, and the upper part of the stay and the inner skin in which the core is disposed And a foam which is foamed and cured by integrating with the outer skin, the stay and the core material, the core material comprising the front plate portion and the horizontal portion. An energy absorbing space is provided in between and the rear end edge of the bottom plate part of the core material is fitted to each leg part, and when a working force of a certain level or more is applied, the fitting part of the rear end edge is a fulcrum. The headrest is attached to the upper portion of the stay so as to be pivotable rearward, and further, an energy absorber that is easier to deform than the core material is disposed in the space.