JP5099662B2

JP5099662B2 - Vehicle seat

Info

Publication number: JP5099662B2
Application number: JP2006124540A
Authority: JP
Inventors: 武志阿久津
Original assignee: TS Tech Co Ltd
Current assignee: TS Tech Co Ltd
Priority date: 2006-04-27
Filing date: 2006-04-27
Publication date: 2012-12-19
Anticipated expiration: 2026-04-27
Also published as: JP2007295996A

Description

本発明は、車両用シートを提供するものであり、特に、背凭シートのクッション材の支持構成に付いて工夫したものである。 The present invention provides a vehicle seat, and is particularly devised for the support structure of the cushion material of the backrest seat.

従来、背凭シートの背凭フレームに、着座者の背部を支持しうる合成樹脂製の一枚板形状のプレート体を、ワイヤスプリングを介して前記背凭フレームに対して前後移動自在に取付けた構成は、公知である（例えば、特許文献１）。
また、従来、背凭シートのフレームに四角枠形状の内部構造体を固定し、該内部構造体の左右側には横弾性屈曲部を設け、弾性屈曲部の間にはスプリング板部を設け、スプリング板部の上下側には縦弾性屈曲部を介してランバーサポート部を設けた構成は公知である（例えば、特許文献２）。
特開２００６−２１６１６号公報特開平１１−２０６５０６号公報 Conventionally, a single-plate plate made of synthetic resin capable of supporting the back of a seated person is attached to the dorsal frame of the dorsal seat so as to be movable back and forth with respect to the dorsal frame via a wire spring. The configuration is known (for example, Patent Document 1).
Conventionally, a square frame-shaped internal structure is fixed to the frame of the dorsal seat, a lateral elastic bending portion is provided on the left and right sides of the internal structure, and a spring plate portion is provided between the elastic bending portions, A configuration in which a lumbar support portion is provided on the upper and lower sides of the spring plate portion via a longitudinal elastic bending portion is known (for example, Patent Document 2).
JP 2006-21616 A JP-A-11-206506

前記公知例のうち前者は、着座者の支持は良好になるが、着座者の体形等に合わせて弾力を調節することができないという課題がある。
また、一枚板形状のプレート体とワイヤスプリングとの関係は、単にプレート体を一枚板形状のまま前後移動させる構成のため、着座者の体形・体格等に合わないという課題もある。
前記公知例のうち後者は、内部構造体の四周は剛体であり、この部分のクッション性は低下するという課題がある。
即ち、四角枠形状の背凭フレームに、更に、四角枠形状の内部構造体を設ける構成のため、中央のランバーサポート部以外のクッション性は低下する。
本願は、荷重を「面」で安定した状態で支持しつつ、着座者の体格や好みに応じてクッション性の弾力を調節可能とし、また、着座者の腰部を良好に支持して、着座フィーリングを向上するように工夫したものである。 Among the known examples, the former is well supported by the seated person, but has a problem that the elasticity cannot be adjusted in accordance with the body shape of the seated person.
Further, since the relationship between the single plate-shaped plate body and the wire spring is simply a structure in which the plate body is moved back and forth in the single plate shape, there is also a problem that it does not match the body shape / physique of the seated person.
Among the known examples, the latter has a problem that the four rounds of the internal structure are rigid, and the cushioning property of this portion is lowered.
In other words, because the square frame-shaped dorsal frame is further provided with a square frame-shaped internal structure, cushioning properties other than the central lumbar support portion are reduced.
The present application supports the load in a stable state on the "surface", allows the cushioning elasticity to be adjusted according to the physique and preference of the seated person, and also supports the seated person's waist well, It is devised to improve the ring.

本発明は、背凭シート２の背凭フレーム３に、着座者の背部を支持しうる弾性変形しながら支持する合成樹脂製の一枚板形状のプレート体３１を、金属製のワイヤスプリング３２を介して前記背凭フレーム３に対して前後移動自在に取付け、前記プレート体３１には、弾性を有する一枚板状の弾力調節プレート４０を前記プレート体３１に対して前後するように設けて、弾力調節プレート４０により着座者の身体の支持弾力を調節しうるように構成し、前記プレート体３１は、該プレート体３１の上縁付近が上側ワイヤスプリング３２Ａにより、前記プレート体３１の上下略中間の所定位置が下側ワイヤスプリング３２Ｂより夫々支持されるように、背凭フレーム３に取付け、前記合成樹脂製のプレート体３１は前記金属製の下側ワイヤスプリング３２Ｂよりも撓むように形成し、もって、下側ワイヤスプリング３２Ｂより下方のプレート体３１の部分を下側撓み部３３に形成し、該下側撓み部３３は荷重が掛かると下側ワイヤスプリング３２Ｂ付近を支点に前記プレート体３１の上部に対して後方に撓むように構成した車両用シートとしたものである。
本発明は、背凭シート２の背凭フレーム３に、着座者の背部を支持しうる弾性変形しながら荷重支持する合成樹脂製の一枚板形状のプレート体３１を、金属製のワイヤスプリング３２を介して前記背凭フレーム３に対して前後移動自在に取付け、前記プレート体３１には、弾性を有する一枚板状の弾力調節プレート４０を前記プレート体３１に対して前後するように設けて、弾力調節プレート４０により着座者の身体の支持弾力を調節しうるように構成し、前記プレート体３１は、該プレート体３１の上縁付近が上側ワイヤスプリング３２Ａにより、前記プレート体３１の上下略中間の所定位置が下側ワイヤスプリング３２Ｂより夫々支持されるように、背凭フレーム３に取付け、前記下側ワイヤスプリング３２Ｂには前記プレート体３１と重なる部分において正面視略直線状の中間直線部８０を形成し、該中間直線部８０より下方のプレート体３１の部分を下側撓み部３３に形成し、もって、プレート体３１の下側撓み部３３に荷重が掛かると中間直線部８０付近を支点にプレート体３１の上部に対して下側撓み部３３が後方に撓むように構成した車両用シートとしたものである。
本発明は、前記下側ワイヤスプリング３２Ｂは、着座者が着座すると弾力的に所定距離後方に移動後停止して着座者の荷重を支持するように構成し、前記下側撓み部３３は、着座者が着座すると弾力的に着座者の荷重により後方へ撓むように構成した車両用シートとしたものである。
本発明は、前記下側ワイヤスプリング３２Ｂには前記プレート体３１と重なる部分において正面視略直線状の中間直線部８０を形成し、該中間直線部８０の略左右中間部分には、平面視前方に突き出るように形成した中間係合部８３を形成し、該中間係合部８３は前記プレート体３１に形成した係合孔８４に係合させた車両用シートとしたものである。
本発明は、前記下側撓み部３３の裏側のプレート体３１には縦の縦軸部８７を有するサポートバネ８６を設けた車両用シートとしたものである。
本発明は、前記サポートバネ８６の縦軸部８７の付近のプレート体３１には、後側に突き出るように縦のリブ９０を設けた車両用シートとしたものである。 In the present invention, a single-plate-shaped plate body 31 made of synthetic resin that is supported while elastically deforming to support the back of a seated person is attached to the back frame 3 of the back sheet 2, and a metal wire spring 32 is provided. The plate body 31 is provided with an elastic plate-like elasticity adjusting plate 40 so as to move back and forth with respect to the plate body 31. The elastic force adjusting plate 40 is configured so that the support elastic force of the seated person's body can be adjusted. The plate body 31 has an upper wire spring 32A in the vicinity of the upper edge of the plate body 31 so as to be approximately in the middle of the plate body 31. Are attached to the back frame 3 so that the predetermined positions are supported by the lower wire springs 32B. The portion of the plate body 31 below the lower wire spring 32B is formed in the lower flexible portion 33. When the load is applied, the lower flexible portion 33 is subjected to the lower wire spring 32B. The vehicle seat is configured to bend backward with respect to the upper portion of the plate body 31 with the vicinity as a fulcrum.
In the present invention, a single plate-shaped plate body 31 made of a synthetic resin that supports a load while being elastically deformed to support a back of a seated person is attached to a back frame 3 of a back seat 2 with a metal wire spring 32. The plate body 31 is provided with an elastic single plate-like elasticity adjusting plate 40 so as to move back and forth with respect to the plate body 31. The elastic elasticity adjusting plate 40 is configured so that the support elasticity of the seated person's body can be adjusted. The intermediate predetermined position is attached to the dorsal frame 3 so as to be supported by the lower wire spring 32B, and the lower wire spring 32B is connected to the plate body 31 and the lower wire spring 32B. In this portion, an intermediate straight portion 80 that is substantially straight when viewed from the front is formed, and a portion of the plate body 31 that is below the intermediate straight portion 80 is formed in the lower bending portion 33, so that the lower bending portion of the plate body 31 is formed. The vehicle seat is configured such that when a load is applied to 33, the lower bending portion 33 bends backward with respect to the upper portion of the plate body 31 with the vicinity of the intermediate straight portion 80 as a fulcrum.
According to the present invention, the lower wire spring 32B is configured to elastically move backward a predetermined distance after a seated person is seated and stop to support the load of the seated person. The vehicle seat is configured to bend flexibly backward by the load of the seated person when the seated person sits.
In the present invention, the lower wire spring 32 </ b> B is formed with an intermediate straight portion 80 that is substantially straight when viewed from the front in a portion overlapping the plate body 31. An intermediate engagement portion 83 is formed so as to protrude into the vehicle body, and the intermediate engagement portion 83 is a vehicle seat engaged with an engagement hole 84 formed in the plate body 31.
The present invention is a vehicle seat in which the plate body 31 on the back side of the lower bending portion 33 is provided with a support spring 86 having a vertical longitudinal axis portion 87.
In the present invention, the plate body 31 in the vicinity of the longitudinal axis portion 87 of the support spring 86 is a vehicle seat provided with vertical ribs 90 so as to protrude rearward.

請求項１の発明では、プレート体３１と下側ワイヤスプリング３２Ｂとの相対的な弾力および剛性を変更することにより、プレート体３１の上部に対して下側撓み部３３を下側ワイヤスプリング３２Ｂ付近を支点に後方に撓ませることができ、着座者の体格や好みに応じてクッション材４の前方に押出す弾力を調節可能としながら、着座者の体格差を吸収でき、着座フィーリングが向上する。
請求項２の発明では、プレート体３１と下側ワイヤスプリング３２Ｂとの相対的な弾力および剛性を変更するのみならず、下側ワイヤスプリング３２Ｂの形状を工夫することにより、一層、下側撓み部３３を中間直線部８０付近を支点に後方に撓ませて、着座者の体格差を吸収でき、着座フィーリングを向上させる。
請求項３の発明では、下側ワイヤスプリング３２Ｂ付近を支点として下側撓み部３３を撓ませることができ、下側撓み部３３の撓みが良好に作用させることができる。
請求項４の発明では、下側ワイヤスプリング３２Ｂの位置ずれを防止できると共に、プレート体３１の係合孔８４により一層下側ワイヤスプリング３２Ｂ付近を支点として下側撓み部３３を撓ませることができ、良好に作用させることができる。
請求項５の発明では、下側撓み部３３の撓み量の設定を容易にできる。
請求項６の発明では、下側撓み部３３の撓み量を変更することが可能となる。 In the first aspect of the invention, by changing the relative elasticity and rigidity of the plate body 31 and the lower wire spring 32B, the lower flexible portion 33 is located near the lower wire spring 32B with respect to the upper portion of the plate body 31. Can be bent backward with the fulcrum as a fulcrum, and the elasticity of pushing forward of the cushioning material 4 can be adjusted according to the physique and preference of the occupant, while absorbing the physique difference of the occupant and improving the seating feeling .
In the invention of claim 2, not only the relative elasticity and rigidity of the plate body 31 and the lower wire spring 32B are changed, but also the shape of the lower wire spring 32B is devised to further reduce the lower bending portion. 33 is bent backward with the vicinity of the intermediate straight portion 80 as a fulcrum, so that the difference in physique of the seated person can be absorbed and the seating feeling is improved.
In the invention of claim 3, the lower bending portion 33 can be bent with the vicinity of the lower wire spring 32B as a fulcrum, and the bending of the lower bending portion 33 can be favorably applied.
In the invention of claim 4, the lower wire spring 32B can be prevented from being displaced, and the lower bending portion 33 can be bent by the engagement hole 84 of the plate body 31 around the lower wire spring 32B as a fulcrum. Can work well.
In the invention of claim 5, the amount of bending of the lower bending portion 33 can be easily set.
In the invention of claim 6, it is possible to change the amount of bending of the lower bending portion 33.

本発明の実施例を図面により説明すると、１は車両用シート、２は車両用シート１の背凭シートであり、該背凭シート２は背凭フレーム３にクッション材４を取付け、クッション材４の外周は表皮部材５により包囲して構成している（図１）。
背凭シート２の上部にはヘッドレスト６を設ける。ヘッドレスト６の構成は任意であり、ヘッドレスト６は少なくとも着座者の頭部を支持する頭部支持部７と、前記背凭シート２に装着するためピラー８とを設けて構成している。
ヘッドレスト６のピラー８は左右方向のヘッドレスト取付杆１０に設けたピラー支持部材１１に高さ調節自在に取付ける。ピラー８とピラー支持部材１１の構成は公知であり、図示は省略するが、ピラー支持部材１１に設けた係合部材を所望高さに位置させたピラー８に形成した係合凹部に選択的に係合させて保持すればよい。 An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a vehicle seat, 2 denotes a back seat of the vehicle seat 1, and the back seat 2 attaches a cushion material 4 to a back frame 3, and the cushion material 4 The outer periphery is surrounded by a skin member 5 (FIG. 1).
A headrest 6 is provided on the upper portion of the dorsal seat 2. The configuration of the headrest 6 is arbitrary, and the headrest 6 is configured by providing at least a head support portion 7 for supporting the head of the seated person and a pillar 8 for mounting on the dorsal seat 2.
The pillar 8 of the headrest 6 is attached to a pillar support member 11 provided on the headrest attachment rod 10 in the left-right direction so that the height can be adjusted. Although the structure of the pillar 8 and the pillar support member 11 is well-known and illustration is abbreviate | omitted, it selectively selects to the engagement recessed part formed in the pillar 8 which located the engagement member provided in the pillar support member 11 in desired height. What is necessary is just to engage and hold | maintain.

前記ヘッドレスト取付杆１０の左右両側は、前記ヘッドレスト６を前後に移動させる上側リンク杆１５の上部に固定する。上側リンク杆１５の上下中間部は回動軸１６により背凭フレーム３の側部フレーム１７に回動自在に取付ける。上側リンク杆１５の下部には、伝動部材（ロッド）２０の上部を軸２１により取付ける。
この場合、上側リンク杆１５は、回動軸１６より上側を上リンクアーム部２２に形成し、回動軸１６より下側を下リンクアーム部２３に形成し、上リンクアーム部２２と下リンクアーム部２３は逆「く」の字形状に形成し、下リンクアーム部２３よりも上リンクアーム部２２を長く形成する。また、上側リンク杆１５は、下リンクアーム部２３が回動軸１６を基準に下方に至るに従い前側に位置するように、傾斜させて取付ける。 The left and right sides of the headrest mounting rod 10 are fixed to the upper portion of the upper link rod 15 that moves the headrest 6 back and forth. An upper and lower intermediate portion of the upper link rod 15 is rotatably attached to a side frame 17 of the back frame 3 by a rotation shaft 16. The upper part of the transmission member (rod) 20 is attached to the lower part of the upper link rod 15 by the shaft 21.
In this case, the upper link rod 15 is formed on the upper link arm portion 22 on the upper side of the rotation shaft 16, and is formed on the lower link arm portion 23 on the lower side of the rotation shaft 16. The arm portion 23 is formed in an inverted “<” shape, and the upper link arm portion 22 is formed longer than the lower link arm portion 23. Further, the upper link rod 15 is attached so as to be inclined so that the lower link arm portion 23 is positioned on the front side as it goes downward with respect to the rotation shaft 16.

しかして、背凭フレーム３には、後方から衝突された着座者の後方移動により後方移動する後突感知体２５を設ける。後突感知体２５は、その両側を前記背凭フレーム３に設けた一対の下側リンク２６の下部に取付軸２７により取付ける。下側リンク２６の上部は背凭フレーム３の側部フレーム１７に回動軸２８により回動自在に取付ける。下側リンク２６の上下中間部には前記伝動部材２０の下部を軸２９により取付ける。
着座者の後方移動により後突感知体２５が後方移動すると、このエネルギーが下側リンク２６と伝動部材２０を介して上側リンク杆１５に伝達され、上側リンク杆１５は伝達された着座者の後方移動エネルギーによりヘッドレスト６を前方移動させ、着座者の頭部を支持する。 Thus, the back collision frame 3 is provided with a rear collision detector 25 that moves backward due to the backward movement of the seated person collided from behind. The rear collision detector 25 is attached to the lower part of a pair of lower links 26 provided on the dorsal frame 3 by attachment shafts 27 on both sides thereof. The upper part of the lower link 26 is pivotally attached to the side frame 17 of the dorsal frame 3 by a pivot shaft 28. The lower part of the transmission member 20 is attached to the upper and lower intermediate part of the lower link 26 by a shaft 29.
When the rear collision detector 25 moves backward due to the backward movement of the seated person, this energy is transmitted to the upper link rod 15 via the lower link 26 and the transmission member 20, and the upper link rod 15 is transmitted to the rear of the seated person. The headrest 6 is moved forward by the moving energy to support the seated person's head.

この場合、後突感知体２５が後方移動すると、下側リンク２６は伝動部材２０を下方に牽引し、伝動部材２０は上側リンク杆１５の下部を下方回動させ、上側リンク杆１５の上部は前方回動してヘッドレスト６を前方移動させる。
したがって、上側リンク杆１５は、前記後突感知体２５に移動量を増幅させてヘッドレスト６を前方移動させ、ヘッドレスト６の移動量を十分に確保でき、着座者の頭部の支持を確実にする。 In this case, when the rear collision detector 25 moves backward, the lower link 26 pulls the transmission member 20 downward, the transmission member 20 rotates the lower portion of the upper link rod 15 downward, and the upper portion of the upper link rod 15 The headrest 6 is moved forward by rotating forward.
Therefore, the upper link rod 15 amplifies the amount of movement of the rear collision detector 25 to move the headrest 6 forward, so that the amount of movement of the headrest 6 can be sufficiently secured and the head of the seated person is reliably supported. .

しかして、前記下側リンク２６および前記上側リンク杆１５の各部材は、前記背凭フレーム３の左右側部フレーム１７と並行方向の板状に形成すると共に、側部フレーム１７に取付けているので、左右の側部フレーム１７の間には前記後突感知体２５が位置するだけであり、着座者に着座時の違和感あるいは不快感を与えない。
しかして、背凭シート２の背凭フレーム３には、板状支持材３０を設ける。板状支持材３０は着座者の上体（腰部を含む上半身）を支持するものである。板状支持材３０は着座者の上体を「面」で支持して、着座姿勢を安定させ、ヘッドレスト６による頭部の支持を良好にさせる。
即ち、従来の上下に並設したジグザグバネ構成では、着座者の上体は荷重により後方移動する各ジグザグバネにより「線」で支持されるので、着座姿勢が安定せず、後突のとき前方移動するヘッドレスト６が頭部を支持しても、着座者の上体が後方移動してしまって、頭部と上体との位置関係がかえって不安定になるが、本願では、板状支持材３０により着座者の上体全体を「面」で支持できて、前方移動するヘッドレスト６が頭部を支持しているときに、板状支持材３０が着座者の上体を「面」で支持するので、頭部を含めた着座者の着座姿勢を極めて安定させる。 Thus, each member of the lower link 26 and the upper link rod 15 is formed in a plate shape parallel to the left and right side frames 17 of the back frame 3 and is attached to the side frame 17. The rear collision detector 25 is only positioned between the left and right side frames 17 and does not give the seated person an uncomfortable feeling or an uncomfortable feeling.
Therefore, a plate-like support member 30 is provided on the dorsal frame 3 of the dorsal seat 2. The plate-like support member 30 supports the upper body of the seated person (upper body including the waist). The plate-like support member 30 supports the upper body of the seated person with a “surface”, stabilizes the sitting posture, and makes the headrest 6 support well.
In other words, in the conventional zigzag spring configuration arranged vertically, the upper body of the seated person is supported by “line” by each zigzag spring that moves backward due to the load, so the seating posture is not stable and moves forward in the case of a rear collision. Even if the headrest 6 supports the head, the upper body of the seated person moves backward, and the positional relationship between the head and the upper body becomes unstable. Since the entire upper body of the seated person can be supported by the “surface” and the headrest 6 moving forward supports the head, the plate-like support member 30 supports the upper body of the seated person by the “surface”. The seating posture of the seated person including the head is extremely stabilized.

前記板状支持材３０は、略四角形の一枚板状のプレート体３１により形成し、プレート体３１は、ポリプロピレン等の合成樹脂により、着座者を支持しうる所定の強度を有しつつ、着座者からの後方荷重（体重の場合も含む）を受けたときある程度弾性変形しながら荷重支持するように構成すると、所謂「当たり」と呼ばれる背当たり時の感触を柔軟にできて、好適である。
板状支持材３０は、前記プレート体３１をジグザグスプリングやフォームドワイヤスプリング等のワイヤスプリング３２を介して背凭フレーム３に前後移動自在に取付けて構成し、板状支持材３０は面状態を保持したまま前後して着座者を支持する。
前記ワイヤスプリング３２は、所定の弾性を有しており、プレート体３１に荷重が掛かったときに、プレート体３１全体が面形状を保持したまま後方移動しうるように構成するが、前記プレート体３１は、該プレート体３１の上縁付近が上側ワイヤスプリング３２Ａにより、前記プレート体３１の上下中間の所定位置が下側ワイヤスプリング３２Ｂより夫々支持されるように、背凭フレーム３に取付ける。 The plate-like support member 30 is formed by a substantially rectangular single plate-like plate body 31, and the plate body 31 is seated while having a predetermined strength capable of supporting a seated person by a synthetic resin such as polypropylene. If the load is supported while being elastically deformed to some extent when it receives a rear load (including the case of weight) from a person, it is preferable because the feeling at the time of back contact called “contact” can be made flexible.
The plate-like support member 30 is configured by attaching the plate body 31 to the dorsal frame 3 through a wire spring 32 such as a zigzag spring or a formed wire spring so as to be movable back and forth. Support the seated person back and forth while holding.
The wire spring 32 has a predetermined elasticity, and is configured such that when a load is applied to the plate body 31, the entire plate body 31 can move backward while maintaining the surface shape. 31 is attached to the dorsal frame 3 so that the upper edge of the plate body 31 is supported by the upper wire spring 32A, and the predetermined positions between the upper and lower sides of the plate body 31 are supported by the lower wire spring 32B.

上側ワイヤスプリング３２Ａおよび下側ワイヤスプリング３２Ｂの夫々の端部は背凭フレーム３の側部フレーム１７に夫々取付ける。
しかして、合成樹脂製のプレート体３１は前記金属製の下側ワイヤスプリング３２Ｂよりも撓むように形成し、下側ワイヤスプリング３２Ｂより下方のプレート体３１の部分は下側撓み部３３に形成する。下側撓み部３３は、側面視、着座者の荷重が掛かるとプレート体３１の上部に対して後方に撓み、この状態の面形状を保持したままでプレート体３１全体が後方移動するように構成する。
即ち、前記下側ワイヤスプリング３２Ｂは着座者の荷重を支持する剛性を有して形成し、これに対して、前記下側撓み部３３は着座者の荷重により撓む弾性を有するように形成することにより、下側撓み部３３は、着座者の荷重が掛かると下側ワイヤスプリング３２Ｂ付近を支点に後方に撓むことになる。 The respective ends of the upper wire spring 32A and the lower wire spring 32B are attached to the side frames 17 of the dorsal frame 3 respectively.
Accordingly, the plate body 31 made of synthetic resin is formed so as to bend more than the lower wire spring 32B made of metal, and the portion of the plate body 31 below the lower wire spring 32B is formed in the lower bent portion 33. The lower bending portion 33 is configured to bend rearward with respect to the upper portion of the plate body 31 when viewed from the side, when a seated person's load is applied, and the entire plate body 31 moves backward while maintaining the surface shape in this state. To do.
That is, the lower wire spring 32B is formed to have rigidity to support a seated person's load, while the lower bending portion 33 is formed to have elasticity to be bent by the seated person's load. Thus, when the seated person is loaded, the lower bending portion 33 bends backward around the lower wire spring 32B as a fulcrum.

この場合、下側ワイヤスプリング３２Ｂの形状は任意であるが、前記下側ワイヤスプリング３２Ｂと前記プレート体３１と重なる部分に正面視略直線状の中間直線部８０を形成することにより、該中間直線部８０より下方のプレート体３１の部分が下側撓み部３３に構成できる。
例えば、図２１の下側ワイヤスプリング３２Ｂは背面視全体を略直線状に形成し、図２２の下側ワイヤスプリング３２Ｂは前記中間直線部８０の左右両側に外側に至に従い低く傾斜する傾斜部８１を形成し、各傾斜部８１に側部フレーム１７に夫々取付ける直線状の取付部８２を形成している。また、図２３の例では８０の左右両側に外側に至に従い高く傾斜する傾斜部８１を形成し、傾斜部８１に側部フレーム１７に夫々取付ける直線状の取付部８２を形成している。
また、図２１〜図２３の何れかの前記下側ワイヤスプリング３２Ｂの中間直線部８０の略左右中間部分には、平面視前方に突き出るように形成した中間係合部８３を形成してもよい（図２５）。中間係合部８３は前記プレート体３１に形成した係合孔８４に係合させると、中間直線部８０と係合孔８４は、下側ワイヤスプリング３２Ｂとプレート体３１との上下左右の位置ずれを防止すると共に、係合孔８４の存在によりプレート体３１の剛性を低くし、一層中間直線部８０付近が下側撓み部３３の後方に撓む支点となる作用を期待している。 In this case, although the shape of the lower wire spring 32B is arbitrary, the intermediate straight line 80 is formed in a portion that overlaps the lower wire spring 32B and the plate body 31 by a substantially straight line when viewed from the front. A portion of the plate body 31 below the portion 80 can be configured as the lower bending portion 33.
For example, the lower wire spring 32B of FIG. 21 is formed in a substantially straight shape when viewed from the rear, and the lower wire spring 32B of FIG. The linear attachment portions 82 that are attached to the side frames 17 are formed on the inclined portions 81, respectively. Further, in the example of FIG. 23, inclined portions 81 that are highly inclined toward the outside are formed on the left and right sides of 80, and linear attachment portions 82 that are respectively attached to the side frames 17 are formed on the inclined portions 81.
Further, an intermediate engagement portion 83 formed so as to protrude forward in plan view may be formed in a substantially right and left intermediate portion of the intermediate linear portion 80 of the lower wire spring 32B in any of FIGS. (FIG. 25). When the intermediate engagement portion 83 is engaged with the engagement hole 84 formed in the plate body 31, the intermediate straight portion 80 and the engagement hole 84 are displaced vertically and horizontally between the lower wire spring 32B and the plate body 31. In addition, the presence of the engagement hole 84 lowers the rigidity of the plate body 31, and expects the effect that the vicinity of the intermediate straight portion 80 becomes a fulcrum that bends backward of the lower bending portion 33.

しかして、下側撓み部３３の裏側にはサポートバネ８６を設ける（図６）。サポートバネ８６はＵ型形状に形成し、線経および材質等を変更して下側撓み部３３の撓み荷重の設定を変更する。
即ち、サポートバネ８６を硬くすると、下側撓み部３３の後方撓み量を少なくし、サポートバネ８６を軟らかくすると下側撓み部３３の後方撓み量を大きくする。
しかして、プレート体３１の上下中間所定位置の後方に、前記後突感知体２５を位置させる。
即ち、背凭フレーム３に板状支持材３０を設けたことで、板状支持材３０の上端から下端の何れかの部分の後方に後突感知体２５を設ければ後突を感知できるようになる点、板状支持材３０の上下中間部分は後方移動量が大きく後突のとき後突感知体２５を大きく移動させて確実に後突を感知できる点、また、後突感知体２５を上方に設けると、その部分の板状支持材３０を所定量後方移動させることになって、着座者の上体の支持が不足してしまう点等の理由から、プレート体３１の上下中間部分の後方に後突感知体２５を位置させる。 Therefore, a support spring 86 is provided on the back side of the lower bending portion 33 (FIG. 6). The support spring 86 is formed in a U shape, and the setting of the bending load of the lower bending portion 33 is changed by changing the line length and material.
That is, if the support spring 86 is hardened, the amount of backward deflection of the lower deflection portion 33 is reduced, and if the support spring 86 is softened, the amount of backward deflection of the lower deflection portion 33 is increased.
Thus, the rear impact detection body 25 is positioned behind the upper and lower intermediate predetermined positions of the plate body 31.
That is, by providing the plate-like support member 30 on the dorsal frame 3, it is possible to detect a rear-end collision if the rear-end collision detector 25 is provided behind any portion from the upper end to the lower end of the plate-like support member 30. The upper and lower middle portions of the plate-like support member 30 have a large rearward movement amount, and when the rear impact occurs, the rear impact detector 25 can be moved greatly to reliably detect the rear impact, and the rear impact detector 25 If it is provided above, the plate-like support member 30 of that portion is moved backward by a predetermined amount, and the upper and lower intermediate portions of the plate body 31 are not supported for reasons such as insufficient support of the upper body of the seated person. The rear collision detector 25 is positioned rearward.

したがって、板状支持材３０による着座者の支持と、後突感知体２５による後突の感知の確実性とを両立させられる。
しかして、前記板状支持材３０のプレート体３１の表側には、プレート体３１に対して前後する弾力調節プレート４０を設ける。
弾力調節プレート４０は、弾性を有する合成樹脂製の一枚板状に形成する。弾力調節プレート４０の後面の上部所定位置には後側に突き出る後方突出係合部４１と前方突出係合部４２を左右方向に夫々複数並設する（図８）。後方突出係合部４１および前方突出係合部４２はプレート体３１に形成した上側係合孔４３と下側係合孔４４とに係合させる（図６、図９）。
後方突出係合部４１は上側に後方膨出部４５を形成し、後方膨出部４５の下面に下向き円弧係合面４６を設けて形成する。下向き円弧係合面４６は上側係合孔４３内の下面に下側円弧面４７に係合する。前方突出係合部４２は後方突出係合部４１の下向き円弧係合面４６より後側に膨出する前方膨出部５０を形成し、前方膨出部５０の下面に上向き円弧係合面５１を設けて形成する。上向き円弧係合面５１は下側係合孔４４内の上面の上側円弧面５２に係合する。 Therefore, both the support of the seated person by the plate-like support member 30 and the certainty of the detection of the rear collision by the rear collision detector 25 can be achieved.
Thus, on the front side of the plate body 31 of the plate-shaped support member 30, an elasticity adjusting plate 40 that moves back and forth with respect to the plate body 31 is provided.
The elasticity adjusting plate 40 is formed in a single plate shape made of synthetic resin having elasticity. A plurality of rearward projecting engaging portions 41 and front projecting engaging portions 42 projecting rearward are arranged in the left and right directions at predetermined positions on the rear surface of the elasticity adjusting plate 40 (FIG. 8) . Backward protruding engaging portion 41 and the forward projection engaging portion 42 is engaged with the upper engaging hole 43 formed in the plate member 31 and the lower engagement hole 44 (FIG. 6, FIG. 9).
The rear protruding engagement portion 41 is formed by forming a rear bulge portion 45 on the upper side and providing a downward arc engagement surface 46 on the lower surface of the rear bulge portion 45. The downward arc engagement surface 46 engages with the lower arc surface 47 on the lower surface in the upper engagement hole 43. The front projecting engagement portion 42 forms a front bulging portion 50 that bulges rearward from the downward arc engaging surface 46 of the rear projecting engagement portion 41, and an upward arc engaging surface 51 on the lower surface of the front bulging portion 50. Is formed. The upward arc engagement surface 51 engages with the upper arc surface 52 on the upper surface in the lower engagement hole 44.

この場合、上側係合孔４３の下側円弧面４７と下側係合孔４４の上側円弧面５２とは、側面視所定位置に設けた中心Ｇとする同心円と略一致する円弧面となるように夫々形成し（図９）、後方突出係合部４１および前方突出係合部４２を上側係合孔４３と下側係合孔４４に挿入係合後、前記中心Ｇを軸心として弾力調節プレート４０が回動するように構成する。
即ち、弾力調節プレート４０の上部は、後方突出係合部４１および前方突出係合部４２を、プレート体３１の上側係合孔４３と下側係合孔４４に、前側から挿入し（図９）、挿入することにより、後方突出係合部４１の下向き円弧係合面４６を上側係合孔４３の下側円弧面４７に係合させ（図１０）、前方突出係合部４２の上向き円弧係合面５１を下側係合孔４４の上側円弧面５２に係合させ、次に、中心Ｇを軸心として弾力調節プレート４０を下方回動させると、弾力調節プレート４０はプレート体３１の前面に重なる（図１１）。 In this case, the lower arc surface 47 of the upper engagement hole 43 and the upper arc surface 52 of the lower engagement hole 44 are arc surfaces that substantially coincide with a concentric circle having a center G provided at a predetermined position in a side view. (FIG. 9), and after the rear projecting engaging portion 41 and the front projecting engaging portion 42 are inserted and engaged in the upper engaging hole 43 and the lower engaging hole 44, the elasticity is adjusted with the center G as an axis. The plate 40 is configured to rotate.
That is, the upper part of the elasticity adjusting plate 40 is inserted with the rear projecting engagement part 41 and the front projecting engagement part 42 into the upper engagement hole 43 and the lower engagement hole 44 of the plate body 31 from the front side (FIG. 9). ), The downward arc engagement surface 46 of the rearward projecting engagement portion 41 is engaged with the lower arc surface 47 of the upper engagement hole 43 (FIG. 10), and the upward arc of the forward projection engagement portion 42 is inserted. When the engagement surface 51 is engaged with the upper circular arc surface 52 of the lower engagement hole 44, and then the elasticity adjustment plate 40 is rotated downward about the center G as the axis, the elasticity adjustment plate 40 is attached to the plate body 31. It overlaps the front (FIG. 11).

弾力調節プレート４０の下部所定位置には後側に突き出る下部係合部５５を形成する。下部係合部５５にはワイヤーケーブル５６のインナーケーブル５７の先端が挿入されるケーブル挿入溝５８を形成する（図６、図１４）。弾力調節プレート４０の下部係合部５５はプレート体３１の下部に設けた下側開口部６０よりプレート体３１の後側に突出させ、プレート体３１の後側に突出する下部係合部５５のケーブル挿入溝５８にインナーケーブル５７の先端を嵌合させ、下部係合部５５の嵌合部５５Ａにインナーケーブル５７の先端のケーブル先端係合体６１を係合させて係止する（図１４では理解を容易にするため嵌合部５５Ａにケーブル先端係合体６１を接触させていないが、これにより構成は限定されない）。
この場合、前記下部係合部５５と下側開口部６０は略同じ左右幅に形成し、前記下部係合部５５の側縁が下側開口部６０の内周に摺接しながら上下するように構成すると、下部係合部５５と下側開口部６０とが互いにガイドのように作用して、弾力調節プレート４０の弾力調節作用を円滑・確実にでき、好適である。 A lower engaging portion 55 protruding rearward is formed at a predetermined position below the elasticity adjusting plate 40. A cable insertion groove 58 into which the tip of the inner cable 57 of the wire cable 56 is inserted is formed in the lower engagement portion 55 (FIGS. 6 and 14). The lower engaging portion 55 of the elasticity adjusting plate 40 protrudes from the lower opening 60 provided at the lower portion of the plate body 31 to the rear side of the plate body 31, and the lower engaging portion 55 protrudes to the rear side of the plate body 31. The tip of the inner cable 57 is fitted into the cable insertion groove 58, and the cable tip engaging body 61 at the tip of the inner cable 57 is engaged and locked to the fitting portion 55A of the lower engaging portion 55 (understand in FIG. 14). For this reason, the cable tip engagement body 61 is not brought into contact with the fitting portion 55A, but the configuration is not limited thereby).
In this case, the lower engaging portion 55 and the lower opening 60 are formed to have substantially the same left and right width, and the side edges of the lower engaging portion 55 are moved up and down while sliding on the inner periphery of the lower opening 60. If comprised, the lower engaging part 55 and the lower side opening part 60 will act like a guide mutually, and the elasticity adjustment effect | action of the elasticity adjustment plate 40 can be performed smoothly and reliably, and it is suitable.

また、下側開口部６０の上下長さは、前記弾力調節プレート４０が撓むために前記下部係合部５５が上下しうる所定長さを有して開口させる。
プレート体３１の左右中央位置にはワイヤーケーブル５６のアウターチューブ６２のチューブ先端６３を係止するチューブ係止部６５を設ける（図６）。チューブ係止部６５はチューブ先端６３の一部または全部がプレート体３１の前後の幅内に埋没するような凹部形状に形成すればよく、実施例ではチューブ係止部６５は、プレート体３１に上側開口部６７を形成し、上側開口部６７の左右側縁に一対の腕部６６を設け、上側開口部６７と左右の腕部６６とによりチューブ先端６３が埋没するような凹部空間を形成し、上側開口部６７にチューブ先端６３を嵌合させる。チューブ先端６３はチューブ係止部６５の腕部６６により左右両側から挟持されながら、上側開口部６７に嵌合する。 The lower opening 60 is opened with a predetermined length that allows the lower engagement portion 55 to move up and down because the elasticity adjusting plate 40 is bent.
A tube locking portion 65 for locking the tube tip 63 of the outer tube 62 of the wire cable 56 is provided at the left and right center position of the plate body 31 (FIG. 6). The tube locking portion 65 may be formed in a concave shape so that part or all of the tube tip 63 is buried in the front and rear width of the plate body 31. In the embodiment, the tube locking portion 65 is formed on the plate body 31. An upper opening 67 is formed, a pair of arm portions 66 are provided at the left and right edges of the upper opening 67, and a recess space is formed by the upper opening 67 and the left and right arm portions 66 so that the tube tip 63 is buried. The tube tip 63 is fitted into the upper opening 67. The tube tip 63 is fitted into the upper opening 67 while being sandwiched from the left and right sides by the arm portion 66 of the tube locking portion 65.

前記チューブ係止部６５と前記下部係合部５５との間のプレート体３１には、前側に凹む嵌合溝６８を形成し（図６）、嵌合溝６８にインナーケーブル５７を嵌合させる。
ワイヤーケーブル５６は、インナーケーブル５７を牽引すると、インナーケーブル５７のケーブル先端係合体６１を取付けた弾力調節プレート４０の下部係合部５５を上方に牽引し、弾力調節プレート４０の下部係合部５５を上方に引き寄せ、その結果、弾力調節プレート４０の上縁と弾力調節プレート４０の下部係合部５５の間の距離を短くして、弾力調節プレート４０の前面を前方に押出す。 The plate body 31 between the tube locking portion 65 and the lower engagement portion 55 is formed with a fitting groove 68 recessed in the front side (FIG. 6), and the inner cable 57 is fitted into the fitting groove 68. .
When the inner cable 57 is pulled, the wire cable 56 pulls the lower engaging portion 55 of the elasticity adjusting plate 40 to which the cable tip engaging body 61 of the inner cable 57 is attached, and the lower engaging portion 55 of the elasticity adjusting plate 40. As a result, the distance between the upper edge of the elasticity adjusting plate 40 and the lower engaging portion 55 of the elasticity adjusting plate 40 is shortened, and the front surface of the elasticity adjusting plate 40 is pushed forward.

しかして、前記サポートバネ８６は縦軸部８７と横軸部８８とによりＵ型形状に形成し（図６）、縦軸部８７は下側開口部６０の左右両側に、横軸部８８は下側開口部６０の下縁より下側に位置するようにすると、下側撓み部３３の撓み量の設定を容易および正確にできて、好適である。
また、サポートバネ８６の縦軸部８７は、後側に突き出るように形成した縦のリブ９０に添わせて設け（図６）、リブ９０はその肉厚や高さを変更することにより下側撓み部３３の撓み量を変更することが可能となる（図６）。 Thus, the support spring 86 is formed in a U shape by a vertical axis portion 87 and a horizontal axis portion 88 (FIG. 6), the vertical axis portion 87 is on both the left and right sides of the lower opening 60, and the horizontal axis portion 88 is If it is located below the lower edge of the lower opening 60, the amount of bending of the lower bending portion 33 can be set easily and accurately, which is preferable.
Further, the longitudinal axis portion 87 of the support spring 86 is provided along a vertical rib 90 formed so as to protrude rearward (FIG. 6), and the rib 90 is provided on the lower side by changing its thickness and height. It becomes possible to change the bending amount of the bending part 33 (FIG. 6).

（実施例の作用）
ヘッドレスト６のピラー８を支持するピラー支持部材１１を、ヘッドレスト取付杆１０に固定し、ヘッドレスト取付杆１０の左右両側は夫々上側リンク杆１５の上部に固定し、各上側リンク杆１５の上下中間部は回動軸１６により側部フレーム１７に取付け、上側リンク杆１５の下端部に伝動部材２０の上部を取付け、伝動部材２０の下部は上部を側部フレーム１７に取付けた下側リンク２６の上下中間部に軸着し、下側リンク２６の下部に後突感知体２５の左右両側を連結状態に取付けているから、後方から衝撃を受けて慣性で着座者が後方へ移動すると、クッション材４を後方に押し、クッション材４はプレート体３１を後方に押し、プレート体３１は後突感知体２５を後方移動させ、後突感知体２５の後方移動により下側リンク２６が回動して伝動部材２０を下方に牽引し、伝動部材２０は上側リンク杆１５を回動軸１６中心に下方回動させ、上側リンク杆１５の上部は回動軸１６中心に前方回動し、これによりヘッドレスト６は軸２１中心に前方移動する。 (Operation of Example)
The pillar support member 11 that supports the pillar 8 of the headrest 6 is fixed to the headrest mounting rod 10, and both the left and right sides of the headrest mounting rod 10 are fixed to the upper portion of the upper link rod 15. Is attached to the side frame 17 by the rotating shaft 16, the upper part of the transmission member 20 is attached to the lower end of the upper link rod 15, and the lower part of the transmission member 20 is the upper and lower sides of the lower link 26 attached to the side frame 17. Since the left and right sides of the rear impact detector 25 are attached to the lower part of the lower link 26 in a connected state, the cushion member 4 is received when the seated person moves rearward due to an impact from the rear. , The cushion member 4 pushes the plate body 31 rearward, the plate body 31 moves the rear collision detection body 25 backward, and the lower link 26 is moved by the rear movement of the rear collision detection body 25. The transmission member 20 is moved downward to cause the upper link rod 15 to rotate downward about the rotation shaft 16, and the upper portion of the upper link rod 15 rotates forward about the rotation shaft 16. As a result, the headrest 6 moves forward about the shaft 21.

したがって、ヘッドレスト６は上側リンク杆１５により前方回動して頭部を支持し、むち打ち症防止効果を奏する。
しかして、上側リンク杆１５は、回動軸１６より上方部分を上リンクアーム部２２に、回動軸１６より下方部分を下リンクアーム部２３に夫々形成し、上リンクアーム部２２は下リンクアーム部２３よりも長く形成しているから、後突感知体２５の移動量（伝動部材２０の上下移動量）に対して、ヘッドレスト取付杆１０の移動量を格段に大きくでき、しかも、ヘッドレスト取付杆１０より上方にあるヘッドレスト６は更に前方移動量が増加し、移動量を十分に確保でき、着座者の頭部の支持を確実にする。
この場合、上側リンク杆１５の下リンクアーム部２３は下方に至るに従い前側に位置するように、傾斜させているから、上側リンク杆１５は伝動部材２０を介して後突感知体２５の後方移動を前方移動に変換してヘッドレスト６を前方移動させる。 Accordingly, the headrest 6 is rotated forward by the upper link rod 15 to support the head, and has an effect of preventing whiplash.
Thus, the upper link rod 15 is formed with the upper part of the upper link arm portion 22 above the rotation shaft 16 and the lower link arm portion 23 with the lower portion of the rotation shaft 16. Since it is formed longer than the arm portion 23, the movement amount of the headrest mounting rod 10 can be remarkably increased with respect to the movement amount of the rear collision detector 25 (the vertical movement amount of the transmission member 20). The headrest 6 located above the heel 10 further increases the amount of forward movement, so that the amount of movement can be sufficiently secured and the seated person's head is reliably supported.
In this case, since the lower link arm portion 23 of the upper link rod 15 is inclined so as to be positioned on the front side as it goes downward, the upper link rod 15 moves rearward of the rear collision detector 25 via the transmission member 20. Is converted to forward movement, and the headrest 6 is moved forward.

そのため、上側リンク杆１５は、ヘッドレスト６を前方移動させるのに、下リンクアーム部２３を後方移動させるので、下リンクアーム部２３の作動方向が後方から衝撃を受けた着座者の移動方向（後方移動）と同じになって、着座者の後方移動を妨げることはなく、むしろ有効に作動するように作用し、合理的な構成となる。
即ち、仮に、下リンクアーム部２３の作動方向を前側にすると、着座者の移動方向（後方移動）と相反することになり、着座者の後方移動を妨げ、有効に作動しない。
したがって、下リンクアーム部２３は回動軸１６中心に後方移動するので、上側リンク杆１５の作動の際、下リンクアーム部２３はクッション材４や表皮部材５を前側に押す必要がなく、確実に作動する。 Therefore, the upper link rod 15 moves the lower link arm portion 23 backward to move the headrest 6 forward, so that the operating direction of the lower link arm portion 23 is the moving direction (rearward) of the seated person who receives an impact from the rear. It is the same as (moving) and does not prevent the seated person from moving backward.
That is, if the operating direction of the lower link arm portion 23 is set to the front side, it will be contrary to the moving direction (backward movement) of the seated person, and the seated person will be prevented from moving rearward and will not operate effectively.
Therefore, since the lower link arm portion 23 moves rearward about the rotation shaft 16, it is not necessary for the lower link arm portion 23 to push the cushion material 4 or the skin member 5 forward when the upper link rod 15 is operated. Operates on.

しかして、下側リンク２６は、その上部を回動軸２８により側部フレーム１７に取付け、その下部に後突感知体２５を取付軸２７により取付け、側部フレーム１７と取付軸２７の間に伝動部材２０の下部を軸２９により取付けているから、下側リンク２６は、取付軸２７を力点、回動軸２８を支点、軸２９を作用点として梃の原理で後突感知体２５の後方移動させる作動力を倍加して軸２９を牽引する。
また、下側リンク２６は、通常は下方に至るに従い前側に位置するように、傾斜させているから、後方から衝撃を受けた後突の際、下側リンク２６は回動軸２８中心に後方回動する。
そのため、下側リンク２６も上側リンク杆１５の下リンクアーム部２３と同様に、作動方向が着座者の移動方向（後方移動）と一致して合理的な構成となり、作動の際、クッション材４や表皮部材５からの干渉も回避して確実に作動する。 Accordingly, the lower link 26 is attached to the side frame 17 at the upper portion thereof by the rotation shaft 28, and the rear collision detector 25 is attached to the lower portion thereof by the attachment shaft 27, and between the side frame 17 and the attachment shaft 27. Since the lower part of the transmission member 20 is attached by the shaft 29, the lower link 26 is located behind the rear collision detector 25 on the principle of scissors, with the attachment shaft 27 as a force point, the rotation shaft 28 as a fulcrum, and the shaft 29 as an action point. The operating force to be moved is doubled and the shaft 29 is pulled.
Further, since the lower link 26 is inclined so that it is normally positioned on the front side as it goes downward, the lower link 26 is rearward about the rotation shaft 28 at the time of a rear collision that receives an impact from the rear. Rotate.
Therefore, similarly to the lower link arm portion 23 of the upper link rod 15, the lower link 26 has a rational configuration in which the operation direction coincides with the movement direction (rearward movement) of the seated person. Further, interference from the skin member 5 is avoided and the operation is ensured.

したがって、上側リンク杆１５、伝動部材２０、下側リンク２６の作動機構は、その前側にクッション材４および表皮部材５が存在しても、作動方向が後側方向となるので、クッション材４および表皮部材５による圧力の干渉を避けられ、後突感知体２５の移動をヘッドレスト６に伝達するのときロスを極力排除でき、作動を確実にする。
しかして、背凭シート２の背凭フレーム３には板状支持材３０を設け、板状支持材３０は略四角形の一枚板状に形成したプレート体３１をワイヤスプリング３２を介して背凭フレーム３に前後移動自在に取付けて構成しているから、板状支持材３０は、保持したまま前後移動して着座者を支持する。 Therefore, the operating mechanism of the upper link rod 15, the transmission member 20, and the lower link 26 is such that the operating direction is the rear direction even if the cushion material 4 and the skin member 5 are present on the front side. Pressure interference by the skin member 5 can be avoided, and loss can be eliminated as much as possible when the movement of the rear collision detector 25 is transmitted to the headrest 6, thereby ensuring the operation.
Thus, the back frame 3 of the back sheet 2 is provided with a plate-like support member 30, and the plate-like support member 30 is a plate body 31 formed in a substantially rectangular single plate shape via a wire spring 32. Since it is configured to be attached to the frame 3 so as to be movable back and forth, the plate-like support member 30 moves back and forth while supporting it to support the seated person.

そのため、従来の上下に並設して「線」で支持するジグザグバネ構成に比して格段に着座感を向上させる。
即ち、「線」で支持するジグザグバネでは、後突のとき前方移動するヘッドレスト６によって頭部を支持しても、着座者の上体の支持不安定になって頭部と上体との位置関係がかえって悪化する惧れがあるが、本願では、板状支持材３０により着座者の上体全体を「面」で支持するので、前方移動するヘッドレスト６と相俟って頭部および着座者の上体を良好に支持でき、頭部を含めた着座者の着座姿勢を極めて安定させる。 Therefore, the seating feeling is greatly improved as compared with the conventional zigzag spring configuration in which the upper and lower sides are arranged side by side and supported by “lines”.
That is, in the zigzag spring supported by the “line”, even if the head is supported by the headrest 6 that moves forward at the time of a rear collision, the support of the upper body of the seated person becomes unstable and the positional relationship between the head and the upper body However, in the present application, since the entire upper body of the seated person is supported by the “plane” by the plate-like support member 30, the head and the seated person's head are coupled with the headrest 6 that moves forward. The upper body can be supported well, and the sitting posture of the seated person including the head is extremely stabilized.

しかして、プレート体３１の下側部分は、着座者の仙骨付近に位置させると、着座者の腰部付近を確実にホールドでき、好適である。
また、板状支持材３０のプレート体３１は略四角形の一枚板状に形成しているから、プレート体３１の所定部分にのみ掛かる荷重も、プレート体３１全体が後方に移動することで上下左右に荷重を分散させ、確実に支持する。
即ち、例えば、上下にプレート体３１を分割して形成すると、上下のプレート体３１の間の部分に荷重が掛かったとき、上下のプレート体３１は夫々回転して荷重を確実に支持できないことがあるが、本願は、略四角形の一枚板状のプレート体３１により板状支持材３０を形成しているので、上下中間に掛かる荷重も板状支持材３０全体により確実に受け止めて支持する。
なお、プレート体３１は背凭フレーム３に前後移動自在に取付けられ、慣性による移動方向はプレート体３１と後突感知体２５共に同じであるから両者の関係において、互いに干渉し合う事態はなく、板状支持材３０による着座者の支持と、後突感知体２５による後突の感知の確実性とを両立させられ、合理的構成となる。 Therefore, if the lower part of the plate body 31 is positioned near the sacrum of the seated person, the vicinity of the waist of the seated person can be reliably held, which is preferable.
In addition, since the plate body 31 of the plate-like support member 30 is formed in a substantially rectangular single plate shape, the load applied only to a predetermined portion of the plate body 31 can be increased or decreased by moving the entire plate body 31 backward. Distribute the load to the left and right to support it securely.
That is, for example, if the upper and lower plate bodies 31 are divided and formed, when a load is applied to a portion between the upper and lower plate bodies 31, the upper and lower plate bodies 31 may rotate and cannot reliably support the load. However, in the present application, since the plate-like support member 30 is formed by the substantially rectangular single plate-like plate body 31, the load applied to the middle of the upper and lower sides is reliably received and supported by the entire plate-like support member 30.
In addition, since the plate body 31 is attached to the dorsal frame 3 so as to be movable back and forth, and the direction of movement due to inertia is the same for both the plate body 31 and the rear collision detector 25, there is no situation where they interfere with each other in the relationship between the two. The support of the seated person by the plate-like support member 30 and the certainty of the detection of the rear collision by the rear collision detector 25 can be made compatible, and a rational configuration is obtained.

また、下側リンク２６および上側リンク杆１５の各部材は、背凭フレーム３の左右側部フレーム１７と並行方向の板状に形成して、側部フレーム１７に取付けているので、プレート体３１と後突感知体２５の前後移動に干渉しないように設けることができ、この点でも、合理的な構成となる。
しかして、前記板状支持材３０のプレート体３１の表側には、弾力調節プレート４０を設けており、弾力調節プレート４０の上部は、後方突出係合部４１および前方突出係合部４２を、プレート体３１の上側係合孔４３および下側係合孔４４の夫々に係合させ、弾力調節プレート４０の下部の下部係合部５５は、プレート体３１の下部に設けた下側開口部下側開口部６０よりプレート体３１の後側に突出させ、プレート体３１の後側に突出する下部係合部５５のケーブル挿入溝５８にインナーケーブル５７を嵌合させて、インナーケーブル５７の先端のケーブル先端係合体ケーブル先端係合体６１を下部係合部５５の下面に係合させているから、弾力調節プレート４０の上縁と下縁との間の距離を短くすると、弾力調節プレート４０の略上下中間所定部分は前側に競り出し、着座者を前方に押す圧力を強くし、反対に、弾力調節プレート４０の上縁と下縁との間隔が長くなると、弾力調節プレート４０の上下中間部分は後側に後退し、着座者を前方に押す圧力を弱くし、着座者に対する弾力を、体格や好みに応じて変更調節する。 Each member of the lower link 26 and the upper link rod 15 is formed in a plate shape parallel to the left and right side frames 17 of the back frame 3 and is attached to the side frame 17. The rear collision detector 25 can be provided so as not to interfere with the back-and-forth movement of the rear collision detector 25, and in this respect as well, the configuration is rational.
Thus, an elastic adjustment plate 40 is provided on the front side of the plate body 31 of the plate-shaped support member 30, and the upper portion of the elastic adjustment plate 40 includes a rear protruding engagement portion 41 and a front protruding engagement portion 42. The lower engaging portion 55 below the elasticity adjusting plate 40 is engaged with each of the upper engaging hole 43 and the lower engaging hole 44 of the plate body 31, and the lower opening portion provided below the plate body 31. The inner cable 57 is fitted into the cable insertion groove 58 of the lower engaging portion 55 projecting from the opening 60 to the rear side of the plate body 31 and projecting to the rear side of the plate body 31, so that the cable at the tip of the inner cable 57 Since the front end engaging body cable front end engaging body 61 is engaged with the lower surface of the lower engaging portion 55, if the distance between the upper edge and the lower edge of the elastic adjustment plate 40 is shortened, the elastic adjustment plate 40 is substantially vertically moved. The predetermined part competes forward, increasing the pressure to push the seat forward, and conversely, if the distance between the upper and lower edges of the elastic adjustment plate 40 becomes longer, the upper and lower intermediate parts of the elastic adjustment plate 40 Retreat to the side, weaken the pressure to push the seated person forward, and change and adjust the elasticity for the seated person according to physique and preference.

即ち、弾力調節プレート４０はプレート体３１の表側に設け、プレート体３１の裏側に設けたワイヤーケーブル５６により弾力調節プレート４０の上縁と下縁との間隔を長短に変更させるように構成しているから、プレート体３１の位置に関わらず弾力調節プレート４０は前後して弾力を調節できる。
したがって、弾力調節プレート４０は、背凭フレーム３に対するプレート体３１の全体および後突感知体２５との位置関係を変えずに、前後して弾力を調節でき、弾力調節プレート４０の存在は後突感知体２５を含むむち打ち対策機構やプレート体３１の本来の作用効果に全く影響しない。
換言すると、クッション材を前方に押し出す弾力調節機構の場合、常時前方にクッション材を付勢させるため、クッション材の後方移動により後突を感知するため後突感知体の移動方向とは反対になるので、弾力調節機構とむち打ち症対策機構との併用はできないと従来考えられていたが、本願では、プレート体３１の表側に弾力調節プレート４０共に移動するように設けているので、併存を可能にしている。 That is, the elasticity adjusting plate 40 is provided on the front side of the plate body 31, and the distance between the upper edge and the lower edge of the elasticity adjusting plate 40 is changed to be longer or shorter by the wire cable 56 provided on the back side of the plate body 31. Therefore, regardless of the position of the plate body 31, the elasticity adjusting plate 40 can adjust the elasticity back and forth.
Therefore, the elasticity adjusting plate 40 can adjust the elasticity back and forth without changing the positional relationship between the entire plate body 31 and the rear collision sensing body 25 with respect to the dorsal fin frame 3, and the presence of the elasticity adjusting plate 40 is the rear collision. There is no influence on the whiplash countermeasure mechanism including the sensing body 25 or the original function and effect of the plate body 31.
In other words, in the case of the elastic force adjusting mechanism that pushes the cushion material forward, the cushion material is always urged forward, so that the rear impact is detected by the rearward movement of the cushion material, which is opposite to the moving direction of the rear impact detector. Therefore, it has been conventionally considered that the elasticity adjusting mechanism and the whiplash countermeasure mechanism cannot be used together. However, in this application, since the elasticity adjusting plate 40 is provided so as to move on the front side of the plate body 31, the coexistence is possible. ing.

それゆえ、後突感知体２５とリンク機構により後突時ヘッドレスト６を前方に移動させうるむち打ち対策機構を設けた車両用シート１でありながら、クッション材４を前方に押出す弾力を調節しうる弾力調節プレート４０との併設が可能となる。
つまり、プレート体３１は背凭フレーム３にワイヤスプリング３２を介して前後移動自在に取付けられているから、プレート体３１に対して弾力調節プレート４０は独立して前側に移動し、且つ、後方から衝撃を受けて慣性で着座者が後方へ移動したときは、この慣性力により弾力調節プレート４０とプレート体３１は一体となって後方移動する。この点、プレート体３１に対して弾力調節機構の弾力調節プレート４０は独立して前側に移動するが、後突されたときの移動方向は一致して、弾力調節プレート４０およびプレート体３１の後方移動により後突感知体２５が共に後方移動して、後突を感知でき、併設可能となるのである。 Therefore, the elasticity of pushing the cushion material 4 forward can be adjusted while the vehicle seat 1 is provided with a whiplash countermeasure mechanism that can move the headrest 6 forward during the rear collision by the rear collision detector 25 and the link mechanism. The elastic adjustment plate 40 can be provided side by side.
That is, since the plate body 31 is attached to the dorsal frame 3 via the wire spring 32 so as to be movable back and forth, the elasticity adjusting plate 40 moves to the front side independently of the plate body 31 and from the rear side. When the seated person moves rearward due to the impact in response to the impact, the elasticity adjusting plate 40 and the plate body 31 move backward together by the inertial force. In this regard, the resilient adjustment plate 40 of the resilient regulation Organization to the plate member 31 is moved to the front side independently moving direction when it is rear collision is consistent, the elastic regulating plate 40 and plate 31 By rearward movement, the rear collision detector 25 moves rearward, and can detect a rear collision and can be provided side by side.

しかして、弾力調節プレート４０は、弾性を有する合成樹脂製の一枚板状に形成し、弾力調節プレート４０の後面の上部所定位置には後側に突き出る後方突出係合部４１と前方突出係合部４２を左右方向に夫々複数並設し、後方突出係合部４１は上側に後方膨出部４５を形成し、後方膨出部４５の下面に下向き円弧係合面４６を設け、前方突出係合部４２は後方突出係合部４１の下向き円弧係合面４６より後側に前方膨出部５０を形成し、前方膨出部５０の下面に上向き円弧係合面５１を設けて形成しているから、後方突出係合部４１および前方突出係合部４２をプレート体３１の上側係合孔４３と下側係合孔４４に前側から挿入すると、後方突出係合部４１および前方突出係合部４は、互いの後方膨出部４５と前方膨出部５０の間隔を広げながら上側係合孔４３と下側係合孔４４内に進入する。 Thus, the elasticity adjusting plate 40 is formed in the shape of a single plate made of synthetic resin having elasticity, and the rear protrusion engaging portion 41 and the front protrusion engaging at the rear upper surface at a predetermined position on the rear surface of the elasticity adjusting plate 40. A plurality of joint portions 42 are juxtaposed in the left-right direction, the rearward projecting engaging portion 41 forms a rearwardly bulging portion 45 on the upper side, a downward arc engaging surface 46 is provided on the lower surface of the rearwardly bulging portion 45, and forwardly projecting The engagement portion 42 is formed by forming a front bulge portion 50 on the rear side of the downward arc engagement surface 46 of the rearward projecting engagement portion 41 and providing an upward arc engagement surface 51 on the lower surface of the front bulge portion 50. Therefore, when the rear projecting engagement portion 41 and the front projecting engagement portion 42 are inserted into the upper engagement hole 43 and the lower engagement hole 44 of the plate body 31 from the front side, the rear projecting engagement portion 41 and the front projecting engagement The joint portion 4 increases the distance between the rear bulge portion 45 and the front bulge portion 50. Entering the reluctant upper engaging hole 43 and the lower engagement hole 44.

進入した後方突出係合部４１の後方膨出部４５と前方突出係合部４２の前方膨出部５０が、下側円弧面４７と上側円弧面５２を乗り越えると、後方突出係合部４１の下向き円弧係合面４６が上側係合孔４３の下側円弧面４７に、前方突出係合部４２の上向き円弧係合面５１が下側係合孔４４の上側円弧面５２に夫々係合する。
そして、上側係合孔４３の下側円弧面４７と下側係合孔４４の上側円弧面５２とは、側面視所定位置に設けた中心Ｇとする同心円と略一致する円弧面となるように形成しているから、後方突出係合部４１および前方突出係合部４２が係合した後に中心Ｇを軸心として弾力調節プレート４０を下方回動させると、弾力調節プレート４０はプレート体３１の前面に重なる。
したがって、後方突出係合部４１と前方突出係合部４２は、プレート体３１の下側円弧面４７と上側円弧面５２を前後から挟持するように位置するから、ワイヤーケーブル５６が弾力調節プレート４０の下部係合部５５を上方に牽引すると、弾力調節プレート４０の後方突出係合部４１および前方突出係合部４２は上方に移動するように力が作用するが、前方突出係合部４２の上向き円弧係合面５１が下側係合孔４４の上側円弧面５２に当たっているので、前方突出係合部４２と下側係合孔４４との係合部分が外れることはなく、弾力調節プレート４０は前方移動する。 When the rear bulging portion 45 of the rear protruding engagement portion 41 that has entered and the front bulging portion 50 of the front protruding engagement portion 42 get over the lower arc surface 47 and the upper arc surface 52, The downward arc engagement surface 46 engages with the lower arc surface 47 of the upper engagement hole 43, and the upward arc engagement surface 51 of the forward projecting engagement portion 42 engages with the upper arc surface 52 of the lower engagement hole 44. .
The lower arc surface 47 of the upper engagement hole 43 and the upper arc surface 52 of the lower engagement hole 44 are arc surfaces that substantially coincide with a concentric circle having a center G provided at a predetermined position in a side view. Therefore, when the elastic adjustment plate 40 is rotated downward about the center G after the rear protrusion engagement portion 41 and the front protrusion engagement portion 42 are engaged, the elasticity adjustment plate 40 is formed on the plate body 31. It overlaps the front.
Accordingly, the rear projecting engagement portion 41 and the front projecting engagement portion 42 are positioned so as to sandwich the lower arc surface 47 and the upper arc surface 52 of the plate body 31 from the front and the rear, so that the wire cable 56 is provided with the elasticity adjusting plate 40. When the lower engaging portion 55 is pulled upward, a force acts so that the rearward projecting engaging portion 41 and the front projecting engaging portion 42 of the elasticity adjusting plate 40 move upward. Since the upward arc engagement surface 51 is in contact with the upper arc surface 52 of the lower engagement hole 44, the engagement portion between the front protrusion engagement portion 42 and the lower engagement hole 44 is not disengaged, and the elasticity adjustment plate 40. Moves forward.

反対に、ワイヤーケーブル５６が緩み、弾力調節プレート４０の下部係合部５５が下方に移動すると、後方突出係合部４１の下向き円弧係合面４６が上側係合孔４３の下側円弧面４７に当たっているので、後方突出係合部４１と後方膨出部４５との係合部分が外れることはなく、弾力調節プレート４０は後方移動する。
このように、弾力調節プレート４０の後方突出係合部４１および前方突出係合部４２は、弾力調節プレート４０の取付を容易にするだけでなく、弾力調節プレート４０の前後移動のときも係合が外れない合理的構成となる。 On the contrary, when the wire cable 56 is loosened and the lower engagement portion 55 of the elasticity adjusting plate 40 is moved downward, the downward arc engagement surface 46 of the rearward projecting engagement portion 41 becomes the lower arc surface 47 of the upper engagement hole 43. Therefore, the engagement portion between the rearward projecting engagement portion 41 and the rear bulge portion 45 is not disengaged, and the elasticity adjusting plate 40 moves rearward.
Thus, the rearward projecting engaging portion 41 and the front projecting engaging portion 42 of the elasticity adjusting plate 40 not only facilitate the attachment of the elasticity adjusting plate 40 but also engage when the elasticity adjusting plate 40 moves back and forth. It is a rational configuration that does not deviate.

しかして、弾力調節プレート４０の下部係合部５５は、プレート体３１の下側開口部６０に嵌合させ、下部係合部５５のケーブル挿入溝５８にワイヤーケーブル５６を直接挿入しているので、ワイヤーケーブル５６の取付に際して、ロッドやブラケットを使用しないですみ、部品点数を減少させ、コストを低くする。
また、弾力調節プレート４０の下部係合部５５とプレート体３１の下側開口部６０との接触部分は、何れも合成樹脂製であるから異音の発生が少ない。
また、弾力調節プレート４０の下部係合部５５はワイヤーケーブル５６により上方に牽引され、弾力調節プレート４０のの前面には背凭シート２のクッション材４があるので、弾力調節プレート４０は前側からクッション材４により押され、後側からワイヤーケーブル５６により引かれて、クッション材４とプレート体３１とにより前後から挟持される。 Therefore, the lower engagement portion 55 of the elasticity adjusting plate 40 is fitted into the lower opening 60 of the plate body 31 and the wire cable 56 is directly inserted into the cable insertion groove 58 of the lower engagement portion 55. When installing the wire cable 56, it is not necessary to use rods or brackets, reducing the number of parts and reducing the cost.
Further, since the contact portion between the lower engaging portion 55 of the elasticity adjusting plate 40 and the lower opening 60 of the plate body 31 is made of synthetic resin, there is little occurrence of abnormal noise.
Further, the lower engagement portion 55 of the elasticity adjusting plate 40 is pulled upward by the wire cable 56, and the cushion material 4 of the dorsal seat 2 is provided on the front surface of the elasticity adjusting plate 40. Therefore, the elasticity adjusting plate 40 is moved from the front side. It is pushed by the cushion material 4, pulled by the wire cable 56 from the rear side, and is sandwiched from the front and rear by the cushion material 4 and the plate body 31.

また、下部係合部５５と下側開口部６０は略同じ左右幅に形成しているので、弾力調節プレート４０が撓むとき、下部係合部５５と下側開口部６０とが互いにガイドのように作用して、弾力調節プレート４０の弾力調節作用を円滑・確実にする。
しかして、プレート体３１の左右中央位置にはワイヤーケーブル５６のアウターチューブ６２のチューブ先端６３を係止するチューブ係止部６５を設けているから、ワイヤーケーブル５６のアウターチューブ６２のチューブ先端６３を直接プレート体３１に埋め込むように取付けることができ、プレート体３１および弾力調節プレート４０の操作機構の全体の前後厚さを薄くすることが可能になる。 Further, since the lower engaging portion 55 and the lower opening 60 are formed to have substantially the same left-right width, when the elasticity adjusting plate 40 is bent, the lower engaging portion 55 and the lower opening 60 are mutually guided. Thus, the elasticity adjusting action of the elasticity adjusting plate 40 is made smooth and reliable.
Since the tube locking portion 65 for locking the tube tip 63 of the outer tube 62 of the wire cable 56 is provided at the left and right center position of the plate body 31, the tube tip 63 of the outer tube 62 of the wire cable 56 is attached. It can be attached so as to be directly embedded in the plate body 31, and it is possible to reduce the thickness of the entire operation mechanism of the plate body 31 and the elasticity adjusting plate 40.

また、チューブ係止部６５と下部係合部５５とを略同じ前後位置に配置することにより、一層、プレート体３１および弾力調節プレート４０並びに弾力調節プレート４０の操作機構の全体の前後厚さを薄くすることが可能になって、好適である。
また、アウターチューブ６２のチューブ先端６３より引き出されたインナーケーブル５７はプレート体３１に嵌合溝６８に嵌合させているから、ワイヤーケーブル５６の作動を確実にするだけでなく、一層、プレート体３１および弾力調節プレート４０並びに弾力調節プレート４０の操作機構の全体の前後厚さを薄くすることができる。 Further, by arranging the tube locking portion 65 and the lower engaging portion 55 at substantially the same front and rear positions, the thickness of the entire plate body 31 and the elasticity adjusting plate 40 and the whole operating mechanism of the elasticity adjusting plate 40 can be reduced. It is possible to reduce the thickness, which is preferable.
Further, since the inner cable 57 drawn from the tube tip 63 of the outer tube 62 is fitted in the fitting groove 68 in the plate body 31, not only the operation of the wire cable 56 is ensured but also the plate body. 31 and the entire thickness of the operating mechanism of the elasticity adjusting plate 40 and the elasticity adjusting plate 40 can be reduced.

しかして、プレート体３１を背凭フレーム３に取付けるワイヤスプリング３２は上下一対設け、ワイヤスプリング３２の内の上側ワイヤスプリング３２Ａはプレート体３１の上縁付近の裏側に取付け、ワイヤスプリング３２の内の下側ワイヤスプリング３２Ｂはプレート体３１の上下中間の所定位置に取付け、合成樹脂製のプレート体３１は金属製の下側ワイヤスプリング３２Ｂより撓むように形成し、下側ワイヤスプリング３２Ｂより下側のプレート体３１の部分は、下側撓み部３３に形成しているから、下側撓み部３３は、着座者が着座して荷重が掛かると、下側ワイヤスプリング３２Ｂ付近を回動中心として後方に折れ曲がるように撓むので、着座フィーリングが向上する。 Thus, a pair of upper and lower wire springs 32 for attaching the plate body 31 to the dorsal frame 3 are provided, and the upper wire spring 32A of the wire spring 32 is attached to the back side near the upper edge of the plate body 31. The lower wire spring 32B is attached to a predetermined position between the upper and lower sides of the plate body 31, the synthetic resin plate body 31 is formed so as to bend from the metal lower wire spring 32B, and the plate below the lower wire spring 32B. Since the portion of the body 31 is formed in the lower bending portion 33, the lower bending portion 33 bends backward with the vicinity of the lower wire spring 32B as the center of rotation when a seated person sits and a load is applied. Therefore, the seating feeling is improved.

即ち、プレート体３１が一枚板状の合成樹脂製のため、下側ワイヤスプリング３２Ｂの支持部分に対して下側撓み部３３に荷重が掛かると、下側撓み部３３が後方に撓む。そのため、着座者の背部から腰部は、肩甲骨付近と腰部分が後方に位置しており、特に、腰部分が背凭シート２により前側に押されると、肩甲骨付近の背部は背凭シート２より浮いて着座疲労が増大するが、着座者の腰部が下側撓み部３３に当たったときに、下側撓み部３３が後方に撓むことで背部全体が背凭シート２に密着し、着座疲労を軽減して着座フィーリングを向上させる。
この場合、弾力調節プレート４０は、ワイヤーケーブル５６が下部係合部５５を上方に牽引すれば前方移動するので、下側撓み部３３が後方に撓んでも、下部係合部５５とチューブ係止部６５との間隔を同じにすれば、弾力調節プレート４０の前方移動量は変化せず、前方に移動する弾力調節プレート４０と後方に撓むプレート体３１の下側撓み部３３とは、相反する移動方向でありながら、両立させることができ、頗る良好な着座フィーリングの車両用シート１を提供する。 That is, since the plate body 31 is made of a single plate-like synthetic resin, when a load is applied to the lower bending portion 33 with respect to the support portion of the lower wire spring 32B, the lower bending portion 33 bends backward. Therefore, from the back to the waist of the seated person, the back of the scapula is located near the scapula and the back of the scapula. Although the seating fatigue is increased by floating more, when the seated person's waist hits the lower bending portion 33, the lower bending portion 33 bends backward so that the entire back portion is closely attached to the dorsal seat 2, Reduces fatigue and improves seating feeling.
In this case, since the elasticity adjusting plate 40 moves forward if the wire cable 56 pulls the lower engaging portion 55 upward, even if the lower bending portion 33 is bent rearward, the lower engaging portion 55 and the tube are locked. If the distance from the portion 65 is the same, the amount of forward movement of the elasticity adjusting plate 40 does not change, and the elasticity adjusting plate 40 that moves forward and the lower bending portion 33 of the plate body 31 that flexes backward are in conflict. A vehicle seat 1 having a good seating feeling that can be made compatible while being in the moving direction is provided.

また、下側ワイヤスプリング３２Ｂは着座者の荷重を支持する剛性を有して形成し、これに対して、下側撓み部３３は着座者の荷重により撓む弾性を有するように形成しているから、着座者の荷重が掛かると下側ワイヤスプリング３２Ｂの付近を支点に下側撓み部３３は後方に撓む。
したがって、着座者の荷重の程度により撓み量は変化する。
また、下側ワイヤスプリング３２Ｂは着座者の荷重を支持する剛性を有して形成し、これに対して、前記下側撓み部３３は着座者の荷重により撓む弾性を有するように形成しているから、プレート体３１は、着座者の荷重により下側撓み部３３が後方に撓むと、この状態の面形状を保持したままでプレート体３１全体が後方移動する。 Further, the lower wire spring 32B is formed to have rigidity to support the load of the seated person, while the lower bending portion 33 is formed to have elasticity that is bent by the load of the seated person. Therefore, when a seated person's load is applied, the lower bending portion 33 bends backward with the vicinity of the lower wire spring 32B as a fulcrum.
Therefore, the amount of deflection changes depending on the degree of load of the seated person.
Further, the lower wire spring 32B is formed to have rigidity to support the load of the seated person, while the lower bending portion 33 is formed to have elasticity that is bent by the load of the seated person. Therefore, when the lower bending portion 33 is bent backward by the load of the seated person, the entire plate body 31 moves backward while maintaining the surface shape in this state.

しかして、下側ワイヤスプリング３２Ｂの形状は任意であるが、前記下側ワイヤスプリング３２Ｂと前記プレート体３１と重なる部分において正面視略直線状の中間直線部８０を形成しているので、該中間直線部８０より下方のプレート体３１の部分が下側撓み部３３となり、プレート体３１の下側撓み部３３に荷重が掛かると中間直線部８０付近を支点にプレート体３１の上部に対して下側撓み部３３が後方に撓み、プレート体３１は着座者の背面形状にフィットする。
また、該中間直線部８０の略左右中間部分には、平面視前方に突き出るように形成した中間係合部８３を形成し、該中間係合部８３は前記プレート体３１に形成した係合孔８４に係合させているから、中間係合部８３と係合孔８４は、下側ワイヤスプリング３２Ｂとプレート体３１との上下左右の位置ずれを防止すると共に、係合孔８４によりプレート体３１の剛性を低くし、一層中間直線部８０付近が下側撓み部３３の後方に撓む支点となって、下側撓み部３３のを円滑に設定通りに撓ませられる。 Thus, although the shape of the lower wire spring 32B is arbitrary, an intermediate straight portion 80 that is substantially straight when viewed from the front is formed in a portion that overlaps the lower wire spring 32B and the plate body 31. The portion of the plate body 31 below the straight portion 80 becomes the lower bent portion 33. When a load is applied to the lower bent portion 33 of the plate body 31, the lower portion of the plate body 31 is lowered with respect to the upper portion of the plate body 31 around the intermediate straight portion 80. The side bending part 33 bends back, and the plate body 31 fits a seated person's back surface shape.
Further, an intermediate engagement portion 83 formed so as to protrude forward in plan view is formed in a substantially right and left intermediate portion of the intermediate linear portion 80, and the intermediate engagement portion 83 is an engagement hole formed in the plate body 31. 84, the intermediate engagement portion 83 and the engagement hole 84 prevent vertical and horizontal misalignment between the lower wire spring 32 </ b> B and the plate body 31, and the engagement hole 84 allows the plate body 31 to be displaced. The intermediate straight portion 80 and the vicinity thereof become a fulcrum that bends backward of the lower bending portion 33, and the lower bending portion 33 can be smoothly bent as set.

しかして、下側撓み部３３は、着座者の荷重の程度により撓み量は変化するが、下側撓み部３３の裏側にはサポートバネ８６を設けているから、サポートバネ８６の線経および材質等を変更することにより、下側撓み部３３の撓み量を容易に設定可能となる。
また、サポートバネ８６の縦軸部８７は、後側に突き出るように形成した縦のリブ９０に添わせて設けているから、リブ９０の肉厚や高さを変更することにより下側撓み部３３の撓み量を変更することが可能となる。 Thus, although the amount of bending of the lower bending portion 33 varies depending on the load of the seated person, a support spring 86 is provided on the back side of the lower bending portion 33. By changing the above, the amount of bending of the lower bending portion 33 can be easily set.
Further, since the longitudinal axis portion 87 of the support spring 86 is provided along the vertical rib 90 formed so as to protrude rearward, the lower flexure portion can be obtained by changing the thickness and height of the rib 90. It becomes possible to change the amount of bending of 33.

背凭シートおよびヘッドレストの斜視図。The perspective view of a dorsal fin seat and a headrest. 背凭シートフレーム側面図。FIG. 分解状態斜視図（プレート体と弾力調節プレートは省略）。Disassembled perspective view (plate body and elasticity adjusting plate omitted). 背凭シートフレームの斜視図（プレート体と弾力調節プレートは省略）。A perspective view of the dorsal seat frame (plate body and elasticity adjusting plate are omitted). 背凭シートフレームの斜視図。The perspective view of a dorsal fin seat frame. プレート体と弾力調節プレートの取付け状態概略斜視図。The attachment state schematic perspective view of a plate body and an elasticity adjustment plate. プレート体と弾力調節プレートの側面図。The side view of a plate body and an elasticity adjustment plate. 弾力調節プレートの係合部の斜視図。The perspective view of the engaging part of an elasticity adjustment plate. 弾力調節プレートをプレート体に取付ける状態の側面図。The side view of the state which attaches an elasticity adjustment plate to a plate body. 弾力調節プレートの係合部を係合孔に係合させた状態図。The state figure which engaged the engagement part of the elasticity adjustment plate to the engagement hole. 弾力調節プレートを回動させた側面図。The side view which rotated the elasticity adjustment plate. 弾力調節プレートを回動させた側面図。The side view which rotated the elasticity adjustment plate. プレート体の一部縦断側面図。The partial vertical side view of a plate body. 弾力調節プレートの一部縦断側面図。The partial vertical side view of a resilience adjustment plate. 弾力調節プレートの下部係合部部分の断面図。Sectional drawing of the lower engaging part part of an elasticity adjustment plate. 弾力調節プレートの下部係合部部分の斜視図。The perspective view of the lower engaging part part of an elasticity adjustment plate. 着座前の弾力調節プレートとプレート体との位置関係図。The positional relationship figure of the elasticity adjustment plate before seating and a plate body. 下側撓み部が撓んだ状態の一例を示す位置関係図。The positional relationship figure which shows an example of the state which the lower side bending part bent. 弾力調節プレートが前方に突き出た状態の一例を示す位置関係図。The positional relationship figure which shows an example of the state which the elasticity adjustment plate protruded ahead. 弾力調節プレートが前方に突き出て下側撓み部が撓んだ状態の一例を示す位置関係図。The positional relationship figure which shows an example of the state which the elasticity adjustment plate protruded ahead and the lower side bending part bent. 下側ワイヤーケーブルの形状の一例を示す背面図。The rear view which shows an example of the shape of a lower wire cable. 下側ワイヤーケーブルの他の例の形状を示す背面図。The rear view which shows the shape of the other example of a lower wire cable. 下側ワイヤーケーブルの他の例の形状を示す背面図。The rear view which shows the shape of the other example of a lower wire cable. 下側ワイヤーケーブルの形状を示す断面図。Sectional drawing which shows the shape of a lower wire cable. 下側ワイヤーケーブルの他の例の形状を示す断面図。Sectional drawing which shows the shape of the other example of a lower wire cable.

Explanation of symbols

１…車両用シート、２…背凭シート、３…背凭フレーム、４…クッション材、５…表皮部材、６…ヘッドレスト、８…ピラー、１０…ヘッドレスト取付用杆、１１…ピラー支持部材、１５…上側リンク杆、１６…回動軸、１７…側部フレーム、２０…伝動部材、２１…軸、２２…上リンクアーム部、２３…下リンクアーム部、２５…後突感知体、２６…下側リンク、２７…取付軸、２８…回動軸、２９…軸、３０…板状支持材、３１…プレート体、３２…ワイヤスプリング、４０…弾力調節プレート、４１…後方突出係合部、４２…前方突出係合部、４３…上側係合孔、４４…下側係合孔、４５…後方膨出部、４６…下向き円弧係合面、４７…下側円弧面、５０…前方膨出部、５１…上向き円弧係合面、５２…上側円弧面、５５…下部係合部、５６…ワイヤーケーブル、５７…インナーケーブル、６１…ケーブル先端係合体、５８…ケーブル挿入溝、６０…下側開口部、６２…アウターチューブ、６３…チューブ先端、６５…チューブ係止部、６６…腕部、６７…上側開口部、６８…嵌合溝、８０…中間直線部、８３…中間係合部、８４…係合孔、８６…サポートバネ、８７…縦軸部、９０…リブ。 DESCRIPTION OF SYMBOLS 1 ... Vehicle seat, 2 ... Backrest seat, 3 ... Backrest frame, 4 ... Cushion material, 5 ... Skin member, 6 ... Headrest, 8 ... Pillar, 10 ... Headrest mounting collar, 11 ... Pillar support member, 15 ... Upper link rod, 16 ... Rotating shaft, 17 ... Side frame, 20 ... Transmission member, 21 ... Shaft, 22 ... Upper link arm, 23 ... Lower link arm, 25 ... Rear collision detector, 26 ... Lower Side link 27 ... Mounting shaft 28 ... Rotating shaft 29 ... Shaft 30 ... Plate-like support material 31 ... Plate body 32 ... Wire spring 40 ... Elasticity adjusting plate 41 ... Backward projecting engagement portion 42 ... forward projecting engaging part, 43 ... upper engaging hole, 44 ... lower engaging hole, 45 ... rear bulging part, 46 ... downward arc engaging surface, 47 ... lower arc surface, 50 ... forward bulging part 51 ... Upward arc engaging surface, 52 ... Upper arc surface, 55 ... Lower engaging portion 56 ... Wire cable, 57 ... Inner cable, 61 ... Cable tip engagement body, 58 ... Cable insertion groove, 60 ... Lower opening, 62 ... Outer tube, 63 ... Tube tip, 65 ... Tube locking part, 66 ... Arm Portion 67, upper opening 68, fitting groove 80 intermediate straight portion 83 intermediate engagement portion 84 engagement hole 86 support spring 87 longitudinal axis 90 rib

Claims

A single plate-like plate body 31 made of synthetic resin that is supported while being elastically deformed to support the back of the seated person is attached to the back frame 3 of the back sheet 2 via a metal wire spring 32. The plate body 31 is attached to the heel frame 3 so as to be movable back and forth, and a single-plate elastic adjustment plate 40 having elasticity is provided on the plate body 31 so as to move back and forth with respect to the plate body 31. The plate body 31 has an upper wire spring 32A in the vicinity of the upper edge of the plate body 31 so that a predetermined position substantially in the middle of the upper and lower sides of the plate body 31 can be adjusted. The plate body 31 made of synthetic resin is attached to the dorsal frame 3 so as to be supported by the lower wire springs 32B. The portion of the plate body 31 below the lower wire spring 32B is formed in the lower flexible portion 33. When the load is applied, the lower flexible portion 33 moves around the lower wire spring 32B. A vehicle seat configured to bend backward with respect to an upper portion of the plate body 31 at a fulcrum.

A single plate-like plate body 31 made of synthetic resin that supports a load while elastically deforming to support the back of the seated person is attached to the back frame 3 of the back sheet 2 via a metal wire spring 32. The plate body 31 is attached to the dorsal frame 3 so as to be movable back and forth, and the plate body 31 is provided with a single-plate elastic adjustment plate 40 having elasticity so as to move back and forth with respect to the plate body 31. 40. The plate body 31 is configured so that the support elasticity of the seated person's body can be adjusted. The plate body 31 has a predetermined position in the vicinity of the upper edge of the plate body 31 by an upper wire spring 32A. Are attached to the dorsal frame 3 so as to be supported by the lower wire springs 32B, and the lower wire springs 32B overlap the plate body 31. An intermediate straight portion 80 that is substantially straight when viewed from the front is formed, and a portion of the plate body 31 below the intermediate straight portion 80 is formed in the lower bending portion 33, and thus the lower bending portion 33 of the plate body 31. A vehicle seat configured such that when a load is applied, the lower bending portion 33 bends backward with respect to the upper portion of the plate body 31 around the middle straight portion 80 as a fulcrum.

In Claim 2, the lower wire spring 32B is configured to elastically stop after moving a predetermined distance backward when a seated person is seated, and to support the load of the seated person. A vehicle seat configured to bend flexibly backward by a load of a seated person when the seated person sits down.

3. The lower straight wire spring 32B according to claim 1 or 2, wherein the lower wire spring 32B is formed with an intermediate straight line portion 80 that is substantially straight when viewed from the front at a portion that overlaps the plate body 31, Is a vehicle seat in which an intermediate engagement portion 83 is formed so as to protrude forward in plan view, and the intermediate engagement portion 83 is engaged with an engagement hole 84 formed in the plate body 31.

5. The vehicle seat according to claim 1, claim 2, claim 3, or claim 4, wherein the plate body 31 on the back side of the lower bending portion 33 is provided with a support spring 86 having a vertical longitudinal axis portion 87.

The vehicle seat according to claim 5, wherein the plate body 31 in the vicinity of the longitudinal axis portion 87 of the support spring 86 is provided with a vertical rib 90 so as to protrude rearward.