JP4489502B2

JP4489502B2 - Armrest mounting configuration

Info

Publication number: JP4489502B2
Application number: JP2004163904A
Authority: JP
Inventors: 操大森
Original assignee: TS Tech Co Ltd
Current assignee: TS Tech Co Ltd
Priority date: 2004-06-01
Filing date: 2004-06-01
Publication date: 2010-06-23
Anticipated expiration: 2024-06-01
Also published as: JP2005342125A

Abstract

<P>PROBLEM TO BE SOLVED: To provide an armrest attachment structure which reduces crosswise jolt of an armrest. <P>SOLUTION: A horizontal shaft 7 is inserted through a through hole 45 of a side plate 43 of a backrest bracket 6 fixed to a side part of a backrest 3 of a seat 1 or a spring attachment bracket 13 fixed to an armrest frame 9, a step 40 formed in the predetermined middle position of the horizontal shaft 7 is made to abut on the side plate 43, the shaft 7 which projects from the side plate 43 is inserted into insertion holes 51 of a plate 50, and the shaft 7 and the plate 50 are fixed by projection welding by applying a predetermined electric current on projection prongs 53 of a predetermined height formed in one or both of the shaft 7 and the plate 50 and pressure, in the condition that the side plate 43 is supported between the step 40 of the shaft 7 and the plate 50, and an armrest 4 is attached so that the prongs can vertically turn around the shaft 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、シートの背凭シートの側部に、左右方向のシャフトの軸周りに回動自在にアームレストを取付け、アームレストの先端位置を使用位置から格納位置に変位させたり、また、先端高さを任意に高さ調節自在にアームレストを取付ける際の、取付方法および取付構成に係るものである。 In the present invention, the armrest is attached to the side portion of the back seat of the seat so as to be rotatable around the axis of the left and right shafts, and the tip position of the armrest is displaced from the use position to the retracted position. This relates to a mounting method and a mounting configuration when mounting the armrest so that the height can be arbitrarily adjusted.

従来、左右方向のシャフトの軸周りに回動自在にアームレストを取付け、アームレストの高さ調節を、コイルバネの摩擦を利用して行うものは公知である。（特許文献１）。
特開２００３−２９９５４７号公報 2. Description of the Related Art Conventionally, it is known that an armrest is attached so as to be rotatable around a shaft in the left-right direction and the height of the armrest is adjusted using friction of a coil spring. (Patent Document 1).
JP 2003-299547 A

前記公知例は、背凭ブラケットに回転自在にシャフトを取付け、シャフトにアームレストを固定する構成であり、図２６のように、ブラケットＡをシャフトＢとプレートＣととにより挟持した状態でレーザーまたはアーク熔接Ｄにより熔接する構成のため、各部の公差がシャフトＢとプレートＣの間に集積して、プレートと側板の間に隙間Ｅが生じるという課題がある。
この課題は、公差が集積して生じるものであるから、製造および組立ての精度を如何に向上させても解決しない。
本願は、背凭ブラケットとシャフトとプレートとの組立構成を工夫することにより、三者を隙間なく取付けたものである。 The known example has a configuration in which a shaft is rotatably attached to a dorsal bracket and an armrest is fixed to the shaft. As shown in FIG. 26, the laser or arc is held with the bracket A held between the shaft B and the plate C. Because of the configuration in which welding is performed by welding D, there is a problem that tolerances of respective parts are accumulated between the shaft B and the plate C, and a gap E is generated between the plate and the side plate.
This problem is caused by the accumulation of tolerances, and cannot be solved no matter how the manufacturing and assembly accuracy is improved.
In the present application, the three members are attached without a gap by devising an assembly configuration of the back bracket, the shaft, and the plate.

本発明は、シート１の背凭シート３の側部に固定の背凭ブラケット６またはアームレストフレーム９に固定するバネ取付用ブラケット１３の側板４３の一方側に突き出るように形成した円筒形状のバーリング部４４の透孔４５に、左右方向のシャフト７を挿通させ、該シャフト７の長さ方向の中間所定位置に形成した段部４０を前記バーリング部４４の端面４６に当接させ、前記シャフト７の端部に、シャフト７の軸方向と略平行に切り欠いて係合溝４７と係合突起４８とを円周方向に交互に形成し、所定の高さを有して少なくとも前記係合溝４７の溝底の溝底面５２に形成したプロジェクション突起５３がシャフト７の軸方向に潰れながらプレート５０の外面Ａに当接するように、前記各係合突起４８を、前記側板４３より突き出させてかつ前記側板４３の内面に当接させたプレート５０の挿通孔５１に挿入係合させ、前記バーリング部４４を設けた部分の側板４３に、前記バーリング部４４に近づくに従い次第に凹む凹部５５を形成し、該凹部５５内の前記バーリング部４４に近づくに従って前記シャフト７の段部４０に向けて次第に凹む傾斜面にプレート５０を当接させて、前記シャフト７の溝底面５２とプレート５０の外面Ａとの間でプロジェクション突起５３を当接させた状態で、前記プロジェクション突起５３に所定電流を通電して加圧するプロジェクション溶接し、溶接後、プレート５０をバネ取付用ブラケット１３の側板４３に隙間無しで当接させてシャフト７とプレート５０とを固定し、シャフト７の軸周りに先端が上下回動自在となるようにアームレスト４を取付けたアームレストの取付方法としたものである。
本発明は、シート１の背凭シート３の側部に設けた背凭ブラケット６またはアームレストフレーム９に固定するバネ取付用ブラケット１３の側板４３の透孔４５に、該シャフト７の長さ方向の中間所定位置に形成した段部４０が前記側板４３の外面に当接するようにシャフト７を挿通し、シャフト７の端部に、シャフト７の軸方向と略平行に切り欠いて係合溝４７と係合突起４８とを円周方向に交互に形成し、前記係合溝４７と係合突起４８のうち各係合突起４８を、前記側板４３の内面に当接させたプレート５０の挿通孔５１に挿入係合させ、前記シャフト７の係合溝４７の溝底の溝底面５２と該溝底面５２が当接する部分のプレート５０の何れか一方または両方に所定の高さを有して形成したプロジェクション突起５３を、溝底面５２または／およびプレート５０に当接させ、前記側板４３には一方側に突き出る円筒形状のバーリング部４４を形成し、バーリング部４４の端面４６にシャフト７の段部４０を当接させ、前記バーリング部４４を設けた部分の側板４３に、前記バーリング部４４に近づくに従い次第に凹む凹部５５を形成し、該凹部５５内の前記バーリング部４４に近づくに従って前記シャフト７の段部４０に向けて次第に凹む傾斜面にプレート５０を当接させて、係合溝４７の溝底面５２がプレート５０の外面Ａに当接し、かつ、側板４３をシャフト７の段部４０とプレート５０により隙間なく挟持するように、プロジェクション溶接によりプロジェクション突起５３をシャフト７の軸方向に潰しながらシャフト７とプレート５０とを溶接固定するアームレストの取付方法としたものである。
本発明は、少なくとも前記溝底面５２にプロジェクション突起５３を形成し、前記側板４３の外面から透孔４５の端面４６までの間隔を「Ｘ」とし、溝底面５２からのプロジェクション突起５３の高さを「Ｙ」とし、段部４０から溝底面５２までの間隔を「Ｚ」とし、溶接前は「Ｘ＜Ｚ＋Ｙ」としたとき、プロジェクション突起５３を潰しながら溶接し、且つ、溶接後も「Ｙ’」の高さをプロジェクション突起５３が有し、これにより「Ｘ＝Ｚ＋Ｙ’」となるように構成したアームレストの取付方法としたものである。
本発明は、シート１の背凭シート３の側部に設けた背凭ブラケット６に、左右方向のシャフト７の軸周りに先端が上下回動自在となるようにアームレスト４を取付けたものにおいて、前記シャフト７の長さ方向の中間所定位置には段部４０を形成し、該段部４０より一方側のシャフト７は大径部４１に、前記段部４０より他方側のシャフト７は小径部４２に夫々形成し、該小径部４２の先端にはシャフト７の軸方向と略平行に切り欠いて係合溝４７と係合突起４８を円周方向に交互に複数形成し、前記背凭ブラケット６またはアームレスト４のアームレストフレーム９に固定のバネ取付用ブラケット１３の側板４３には一方側に突き出て前記シャフト７の段部４０が当接する端面４６を有する円筒形状のバーリング部４４を形成し、バーリング部４４にはシャフト７の小径部４２の外径と同じ透孔４５を形成し、前記バーリング部４４を設けた部分の側板４３に、前記バーリング部４４に近づくに従い次第に凹む凹部５５を形成し、該凹部５５内の前記バーリング部４４に近づくに従って前記シャフト７の段部４０に向けて次第に凹む傾斜面に前記係合突起４８が挿通係合する挿通孔５１を形成したプレート５０を当接させ、前記シャフト７の係合溝４７の溝底の溝底面５２と該溝底面５２が当接する部分のプレート５０の何れか一方または両方に、前記シャフト７の軸方向に潰れた溶接後も所定の高さを有するプロジェクション用のプロジェクション突起５３を形成し、前記側板４３に前記プレート５０の一部が密着するように、前記係合溝４７の溝底面５２をプレート５０の外面Ａに当接させた状態で通電してプロジェクション溶接するアームレストの取付構成としたものである。
本発明は、少なくとも前記溝底面５２にプロジェクション突起５３を形成し、前記側板４３の外面から透孔４５の端面４６までの間隔を「Ｘ」とし、溝底面５２からのプロジェクション突起５３の高さを「Ｙ」とし、段部４０から溝底面５２までの間隔を「Ｚ」とし、溶接前は「Ｘ＜Ｚ＋Ｙ」としたとき、溶接によりプロジェクション突起５３の高さが「Ｙ’」に変化して「Ｘ＝Ｚ＋Ｙ’」となるように構成したアームレストの取付構成としたものである。 The present invention relates to a cylindrical burring portion formed so as to protrude from one side of a side plate 43 of a spring mounting bracket 13 fixed to a back bracket 6 fixed to the side portion of the back seat 3 of the seat 1 or the armrest frame 9. The shaft 7 in the left-right direction is inserted into the through-hole 45 of 44, the stepped portion 40 formed at a predetermined intermediate position in the length direction of the shaft 7 is brought into contact with the end surface 46 of the burring portion 44, and the shaft 7 At the end, the engagement grooves 47 and the engagement protrusions 48 are alternately formed in the circumferential direction by notching substantially parallel to the axial direction of the shaft 7, and at least the engagement groove 47 having a predetermined height. The projecting projections 53 formed on the groove bottom surface 52 of the groove bottom of each of the grooves may be protruded from the side plate 43 so that the projections 53 abut against the outer surface A of the plate 50 while being crushed in the axial direction of the shaft 7. Inserted into and engaged with the insertion hole 51 of the plate 50 brought into contact with the inner surface of the side plate 43, and formed in the side plate 43 of the portion provided with the burring portion 44, a concave portion 55 that is gradually recessed as approaching the burring portion 44, The plate 50 is brought into contact with the inclined surface gradually dented toward the stepped portion 40 of the shaft 7 as it approaches the burring portion 44 in the concave portion 55 , and the groove bottom surface 52 of the shaft 7 and the outer surface A of the plate 50 are brought into contact with each other. With the projection projection 53 in contact with each other, projection welding is performed by applying a predetermined current to the projection projection 53 to pressurize it, and after welding, the plate 50 contacts the side plate 43 of the spring mounting bracket 13 without a gap. by fixing the the shaft 7 and the plate 50, the armrest 4 so that the tip about the axis of the shaft 7 is freely vertically rotated Mounting of attaching the armrest is obtained by the.
In the present invention, the shaft 7 is inserted into the through hole 45 of the side plate 43 of the spring mounting bracket 13 fixed to the back bracket 6 or the armrest frame 9 provided on the side portion of the back seat 3 of the seat 1. The shaft 7 is inserted so that the stepped portion 40 formed at the intermediate predetermined position contacts the outer surface of the side plate 43, and the engaging groove 47 is cut out at the end of the shaft 7 substantially parallel to the axial direction of the shaft 7. The engagement protrusions 48 are alternately formed in the circumferential direction, and the insertion holes 51 of the plate 50 in which the engagement protrusions 48 out of the engagement grooves 47 and the engagement protrusions 48 are brought into contact with the inner surface of the side plate 43. The groove bottom surface 52 of the engagement groove 47 of the shaft 7 and the plate 50 at the part where the groove bottom surface 52 abuts are formed with a predetermined height. Projection projection 53 is moved to groove bottom surface 52. The side plate 43 is formed with a cylindrical burring portion 44 projecting to one side, the stepped portion 40 of the shaft 7 is brought into contact with the end surface 46 of the burring portion 44, and the burring portion A recess 55 is formed in the side plate 43 of the portion provided with 44, which is gradually recessed as it approaches the burring portion 44, and is gradually recessed toward the step portion 40 of the shaft 7 as it approaches the burring portion 44 in the recess 55 . The plate 50 is brought into contact with the surface, the groove bottom surface 52 of the engagement groove 47 is brought into contact with the outer surface A of the plate 50, and the side plate 43 is sandwiched between the step portion 40 of the shaft 7 and the plate 50 without any gaps. An armrest for fixing the shaft 7 and the plate 50 by welding while crushing the projection protrusion 53 in the axial direction of the shaft 7 by projection welding. It is obtained by the mounting method.
In the present invention, the projection protrusion 53 is formed at least on the groove bottom surface 52, the distance from the outer surface of the side plate 43 to the end surface 46 of the through hole 45 is “X”, and the height of the projection protrusion 53 from the groove bottom surface 52 is set. When “Y” is set, the interval from the stepped portion 40 to the groove bottom surface 52 is “Z”, and “X <Z + Y” is set before welding, the projection projection 53 is welded while being crushed. The projection protrusion 53 has a height of "", and this is an attachment method of the armrest configured to be "X = Z + Y '".
In the present invention, the armrest 4 is attached to the dorsal bracket 6 provided on the side of the dorsal seat 3 of the seat 1 so that the tip can be turned up and down around the axis of the shaft 7 in the left-right direction. A step portion 40 is formed at a predetermined intermediate position in the length direction of the shaft 7, the shaft 7 on one side of the step portion 40 is a large diameter portion 41, and the shaft 7 on the other side of the step portion 40 is a small diameter portion. 42, and a plurality of engaging grooves 47 and engaging protrusions 48 are alternately formed in the circumferential direction by cutting out at the tip of the small diameter portion 42 substantially in parallel with the axial direction of the shaft 7, 6 or the side plate 43 of the spring mounting bracket 13 fixed to the armrest frame 9 of the armrest 4 is formed with a cylindrical burring portion 44 having an end surface 46 projecting to one side and contacting the stepped portion 40 of the shaft 7; Berlin The portion 44 is formed with a through hole 45 that is the same as the outer diameter of the small-diameter portion 42 of the shaft 7, and a concave portion 55 that is gradually recessed toward the burring portion 44 is formed on the side plate 43 of the portion provided with the burring portion 44, A plate 50 having an insertion hole 51 into which the engagement protrusion 48 is inserted and engaged with an inclined surface gradually dented toward the stepped portion 40 of the shaft 7 as approaching the burring portion 44 in the recess 55; Even after welding that is crushed in the axial direction of the shaft 7, the groove bottom surface 52 of the groove 7 of the engagement groove 47 of the shaft 7 and the plate 50 of the portion where the groove bottom surface 52 abuts are applied to a predetermined height. A projection projection 53 for projection having a thickness is formed, and the groove bottom surface 52 of the engagement groove 47 is arranged outside the plate 50 so that a part of the plate 50 is in close contact with the side plate 43. Energized being in contact with the A is obtained by the mounting structure of the armrest of projection welding.
In the present invention, the projection protrusion 53 is formed at least on the groove bottom surface 52, the distance from the outer surface of the side plate 43 to the end surface 46 of the through hole 45 is “X”, and the height of the projection protrusion 53 from the groove bottom surface 52 is set. When “Y” is set, the distance from the stepped portion 40 to the groove bottom surface 52 is “Z”, and “X <Z + Y” before welding, the height of the projection protrusion 53 is changed to “Y ′” by welding. The armrest is constructed so as to be “X = Z + Y ′”.

請求項１および請求項２の発明では、バネ取付用ブラケット１３とシャフト７とプレート５０とを軸方向に互いに隙間なく取付けることができ、アームレスト４の先端が左右に振れる振幅量を減少させ、商品価値を向上させる。
請求項３の発明では、バーリング部４４が存在することによりシャフト７の段部４０とプレート５０との間に距離を置くことができ、適切にプロジェクション熔接できる。
請求項４の発明では、溶接作業を容易にでき、バネ取付用ブラケット１３にシャフト７またはプレート５０の一方または両方が熔接固定される不具合を回避できる。
請求項５の発明では、バネ取付用ブラケット１３とシャフト７とプレート５０とを軸方向に互いに隙間なく取付けたアームレスト４を提供でき、アームレスト４の先端が左右に振れる振幅量を減少させ、商品価値を向上させる。
請求項６の発明では、バーリング部４４が存在することによりシャフト７の段部４０とプレート５０との間に距離を置くことができ、適切にプロジェクション熔接できる。
請求項７の発明では、バネ取付用ブラケット１３とシャフト７とプレート５０とを軸方向に互いに隙間なく取付けるための設定が極めて簡単容易にでき、バネ取付用ブラケット１３にシャフト７またはプレート５０の一方または両方が熔接される不具合を回避できる。 According to the first and second aspects of the present invention, the spring mounting bracket 13, the shaft 7 and the plate 50 can be attached to each other in the axial direction without gaps, and the amount of amplitude at which the tip of the armrest 4 swings left and right is reduced. Increase value.
In the third aspect of the invention, the presence of the burring portion 44 allows a distance to be set between the step portion 40 of the shaft 7 and the plate 50, thereby enabling appropriate projection welding.
In the invention of claim 4, the welding operation can be facilitated, and the problem that one or both of the shaft 7 and the plate 50 are welded and fixed to the spring mounting bracket 13 can be avoided.
According to the invention of claim 5, the armrest 4 can be provided in which the spring mounting bracket 13, the shaft 7 and the plate 50 are attached to each other without gaps in the axial direction, and the amount of amplitude by which the tip of the armrest 4 swings left and right is reduced. To improve.
In the invention of claim 6, the presence of the burring portion 44 allows a distance to be set between the step portion 40 of the shaft 7 and the plate 50, thereby enabling appropriate projection welding.
According to the seventh aspect of the present invention, the setting for mounting the spring mounting bracket 13, the shaft 7 and the plate 50 in the axial direction without any gaps can be made extremely simple and easy, and either the shaft 7 or the plate 50 is attached to the spring mounting bracket 13. Or the trouble that both are welded can be avoided.

本発明の実施例を図面により説明すると、１は車両用等のシート、２は座席シート、３は座席シート２に傾斜角度調節自在に設けた背凭シート、４は背凭シート３の側部に設けたアームレストである。
アームレスト４は、例えば、本来使用される使用範囲Ａではアームレスト４の下方回動をロックして荷重を支受し、且つ、上方回動のみ自在にして高さ調節可能にし、使用範囲Ａの上限位置と同じかそれより間隔を置いて設けた格納範囲Ｂではアンロック状態になって上下回動自在とし、格納範囲Ｂから使用範囲Ａの最下方位置まで一旦下方回動可能であるが、最下方位置でロック可能状態に復帰させて使用範囲Ａでは上方回動のみ自在となるように構成すると、操作性を向上させて好適である（図１）。 An embodiment of the present invention will be described with reference to the drawings. 1 is a vehicle seat, 2 is a seat seat, 3 is a back seat provided on the seat seat 2 so that the inclination angle can be adjusted, and 4 is a side portion of the back seat 3. It is the armrest provided in.
For example, the armrest 4 is configured to lock the downward rotation of the armrest 4 in the originally used usage range A to support the load, and to allow only the upward rotation to be adjustable in height. In the storage range B that is the same as or spaced from the position, the storage range B is unlocked and can be turned up and down, and can be turned downward from the storage range B to the lowest position of the use range A. It is preferable to improve the operability by returning to the lockable state at the lower position so that only upward rotation is possible in the use range A (FIG. 1).

前記アームレスト４は、背凭シート３の背凭骨格フレーム５の側部に設けた背凭ブラケット６に、左右方向のシャフト７を軸心として上下回動自在に取付ける。シャフト７は途中部分に段部４０を形成し（図４）、段部４０より一方側のシャフト７は大径部４１に形成し、段部４０より他方側のシャフト７は小径部４２に形成する（図４）。
前記アームレスト４の前記アームレストフレーム９には、バネ取付用ブラケット１３を固定し（図２、図３）、バネ取付用ブラケット１３の側板４３には一方側に突き出る円筒形状のバーリング部４４を形成する。バーリング部４４は、その内径を前記シャフト７の小径部４２の外径と同じに形成して、小径部４２をバーリング部４４の透孔４５に挿通し、バーリング部４４の端面４６にシャフト７の段部４０を当接させる。
前記小径部４２の先端には母線方向に切り欠いて係合溝４７と係合突起４８を円周方向に交互に複数形成する（図４）。
シャフト７の各係合突起４８はプレート５０の各挿通孔５１に挿入する。 The armrest 4 is attached to a dorsal bracket 6 provided on the side of the dorsal skeleton frame 5 of the dorsal seat 3 so as to be rotatable up and down around a shaft 7 in the left-right direction. The shaft 7 is formed with a step portion 40 in the middle (FIG. 4), the shaft 7 on one side of the step portion 40 is formed on the large diameter portion 41, and the shaft 7 on the other side of the step portion 40 is formed on the small diameter portion 42. (FIG. 4).
A spring mounting bracket 13 is fixed to the armrest frame 9 of the armrest 4 (FIGS. 2 and 3), and a cylindrical burring portion 44 protruding to one side is formed on the side plate 43 of the spring mounting bracket 13. . The inner diameter of the burring portion 44 is the same as the outer diameter of the small diameter portion 42 of the shaft 7, the small diameter portion 42 is inserted into the through hole 45 of the burring portion 44, and the end surface 46 of the burring portion 44 is inserted into the end surface 46 of the shaft 7. The step 40 is brought into contact.
A plurality of engaging grooves 47 and engaging protrusions 48 are alternately formed in the circumferential direction by notching in the generatrix direction at the tip of the small diameter portion 42 (FIG. 4).
Each engagement protrusion 48 of the shaft 7 is inserted into each insertion hole 51 of the plate 50.

しかして、前記係合溝４７の溝底の溝底面５２には溝底面５２より所定の高さ（大きさ）のプロジェクション突起５３を形成する。この場合、プロジェクション突起５３は、各挿通孔５１の間のプレート５０の外面Ａと溝底面５２との何れか一方または両方に形成してもよい。
バーリング部４４の透孔４５に挿通したシャフト７は、シャフト７の小径部４２の係合突起４８をプレート５０の挿通孔５１に挿通させた状態で、シャフト７とプレート５０とに通電し、電流をプロジェクション突起５３に集中させて行うプロジェクション溶接する。 Accordingly, a projection protrusion 53 having a predetermined height (size) from the groove bottom surface 52 is formed on the groove bottom surface 52 at the bottom of the engagement groove 47. In this case, the projection protrusion 53 may be formed on one or both of the outer surface A of the plate 50 and the groove bottom surface 52 between the insertion holes 51.
The shaft 7 inserted through the through hole 45 of the burring portion 44 energizes the shaft 7 and the plate 50 in a state where the engagement protrusion 48 of the small diameter portion 42 of the shaft 7 is inserted into the insertion hole 51 of the plate 50, Projection welding is performed by concentrating on the projection projection 53.

即ち、シャフト７の段部４０がバネ取付用ブラケット１３のバーリング部４４の透孔４５の端面４６に当接し、シャフト７の溝底面５２とプレート５０の外面Ａとの間でプロジェクション突起５３を当接させた状態で、通電してプロジェクション溶接し、溶接後、プレート５０をバネ取付用ブラケット１３の側板４３に隙間無しで当接させる。
したがって、シャフト７の段部４０とバネ取付用ブラケット１３の透孔４５の端面４６と、プレート５０とバネ取付用ブラケット１３の側板４３との二か所は、図示は省略したグリス等の潤滑部材のみが介在するだけで、殆ど、隙間無しで当接し、シャフト７がバネ取付用ブラケット１３（アームレストフレーム９、背凭ブラケット６）に対してがたつくのを防止し、その結果、アームレスト４の先端が使用位置にて左右方向に振れるのを防止する。 That is, the step portion 40 of the shaft 7 abuts on the end surface 46 of the through hole 45 of the burring portion 44 of the spring mounting bracket 13, and the projection projection 53 is abutted between the groove bottom surface 52 of the shaft 7 and the outer surface A of the plate 50. In the state of contact, power is applied and projection welding is performed. After welding, the plate 50 is brought into contact with the side plate 43 of the spring mounting bracket 13 without a gap.
Accordingly, the two parts of the step portion 40 of the shaft 7, the end face 46 of the through hole 45 of the spring mounting bracket 13, and the plate 50 and the side plate 43 of the spring mounting bracket 13 are lubricated members such as grease, not shown. The shaft 7 is almost abutted with no gap, and the shaft 7 is prevented from rattling against the spring mounting bracket 13 (armrest frame 9 and dorsal bracket 6). Prevents left and right swinging at the use position.

実施例では、溝底面５２にプロジェクション突起５３を形成し、側板４３の外面から透孔４５の端面４６までの間隔を「Ｘ」とし（図４）、溝底面５２からのプロジェクション突起５３の高さを「Ｙ」とし（図４）、段部４０から溝底面５２までの間隔を「Ｚ」としたとき（図４）、溶接前は「Ｘ＜Ｚ＋Ｙ」であるが、溶接時にプロジェクション突起５３が潰れて溶接後のプロジェクション突起５３の高さが「Ｙ’」に変化し、これにより「Ｘ＝Ｚ＋Ｙ’」となるように構成する（図７）。 In the embodiment, the projection protrusion 53 is formed on the groove bottom surface 52, the distance from the outer surface of the side plate 43 to the end surface 46 of the through hole 45 is “X” (FIG. 4), and the height of the projection protrusion 53 from the groove bottom surface 52. Is “Y” (FIG. 4), and the distance from the stepped portion 40 to the groove bottom surface 52 is “Z” (FIG. 4), “X <Z + Y” before welding. The height of the projection projection 53 after being crushed and changed to “Y ′” is set to “X = Z + Y ′” (FIG. 7).

したがって、適切な電流値等の熔接条件および加圧力による熔接中にプロジェクション突起５３が溶解して潰れることで、潰れたプロジェクション突起５３の高さＹ’およびシャフト７の段部４０と溝底面５２の間隔Ｚがバーリング部４４の高さＸと一致して、プレート５０はバネ取付用ブラケット１３の側板４３に密着し、熔接の際の設定が容易であり、可及的にバネ取付用ブラケット１３とシャフト７とプレート５０の隙間をゼロにする。 Therefore, the projection projection 53 is melted and crushed during welding under an appropriate current value and other welding conditions and pressure, so that the height Y ′ of the crushed projection projection 53 and the step portion 40 of the shaft 7 and the groove bottom surface 52 are reduced. The interval Z coincides with the height X of the burring portion 44, and the plate 50 is in close contact with the side plate 43 of the spring mounting bracket 13, so that setting at the time of welding is easy. The gap between the shaft 7 and the plate 50 is made zero.

しかして、図１０の実施例は、前記バーリング部４４を設けた部分の側板４３は、バーリング部４４に近づくに従い次第に一方側に凹む擂り鉢形状の凹部５５を形成する。凹部５５は円形の前記プレート５０の直径よりも大に形成し、プレート５０の周縁が側板４３でなく凹部５５に当接するように構成すると、プレート５０とバネ取付用ブラケット１３の側板４３との接触面積を小さくし、操作抵抗を減少させられ、好適である。 Thus, in the embodiment of FIG. 10, the side plate 43 at the portion where the burring portion 44 is provided forms a bowl-shaped concave portion 55 that is gradually dented to one side as the burring portion 44 is approached. If the concave portion 55 is formed larger than the diameter of the circular plate 50 and the periphery of the plate 50 abuts against the concave portion 55 instead of the side plate 43, the contact between the plate 50 and the side plate 43 of the spring mounting bracket 13 is achieved. It is preferable because the area can be reduced and the operation resistance can be reduced.

しかして、アームレスト４は、そのアームレストフレーム９の基部と背凭ブラケット６との間にロック装置Ｌを設ける。ロック装置Ｌは、前記シャフト７の大径部４１の外周にロックスプリング１１のコイル部１２を嵌合させ、ロックスプリング１１の摩擦によってロックし、摩擦解除によりアンロックとなって傾斜調節できるように構成されていればよく、その他の構成は任意である。ロック装置Ｌの構成は任意であるが、以下、一実施例を示す。
ロックスプリング１１の一端はアームレストフレーム９に固定のバネ取付用ブラケット１３のステイ１４に係合させて固定側端部１５に形成し、ロックスプリング１１の他端は自由端２０に形成し、コイル部１２は、アームレスト４の下動に伴ってシャフト７の大径部４１が回転すると、締まる巻き方向に設定し、これにより、他端が自由端２０であってもアームレスト４を下方回動させようとすると、シャフト７の大径部４１とコイル部１２の内周との摩擦抵抗によりコイル部１２の直径を小にする方向に作用し、この摩擦抵抗によりアームレスト４の下方回動を阻止してロックさせる。 Thus, the armrest 4 is provided with a locking device L between the base of the armrest frame 9 and the dorsal bracket 6. The lock device L is configured so that the coil portion 12 of the lock spring 11 is fitted to the outer periphery of the large-diameter portion 41 of the shaft 7, locked by friction of the lock spring 11, and unlocked by friction release so that the inclination can be adjusted. What is necessary is just to be comprised, and another structure is arbitrary. Although the configuration of the locking device L is arbitrary, an example will be shown below.
One end of the lock spring 11 is engaged with a stay 14 of a spring mounting bracket 13 fixed to the armrest frame 9, and is formed on a fixed side end portion 15. The other end of the lock spring 11 is formed on a free end 20, and a coil portion. 12 is set to a winding direction that tightens when the large-diameter portion 41 of the shaft 7 rotates in accordance with the downward movement of the armrest 4, so that the armrest 4 can be rotated downward even if the other end is the free end 20. Then, the frictional resistance between the large-diameter portion 41 of the shaft 7 and the inner periphery of the coil portion 12 acts in a direction to reduce the diameter of the coil portion 12, and this frictional resistance prevents the armrest 4 from rotating downward. Lock it.

前記バネ取付用ブラケット１３には、前記ロック装置Ｌの自由端２０をアンロック位置に保持するアンロック用カム面２２と該アンロック用カム面２２への係合を案内する案内カム面２３とを有する切替カム溝２４を形成する。
切替カム溝２４は、シャフト７の軸心方向と略平行になるように屈曲させたバネ取付用ブラケット１３の屈曲板部２５に、基本的には屈曲板部２５の先端側（左側）を開放したＵ型形状に形成する。
実施例では、屈曲板部２５はバネ取付用ブラケット１３の下側に形成し、図１２、図１４、図１６、図１８、図２０、図２２、図２４は、下側から見た状態で図示しているが、図２および図３の実施例ではバネ取付用ブラケット１３の前縁に横方向に屈曲させて形成しており、屈曲板部２５の設置位置は図示に限定されない。 The spring mounting bracket 13 includes an unlock cam surface 22 that holds the free end 20 of the lock device L in the unlock position, and a guide cam surface 23 that guides the engagement with the unlock cam surface 22. The switching cam groove 24 having
The switching cam groove 24 basically opens the distal end side (left side) of the bent plate portion 25 to the bent plate portion 25 of the spring mounting bracket 13 bent so as to be substantially parallel to the axial center direction of the shaft 7. It is formed into a U-shaped shape.
In the embodiment, the bent plate portion 25 is formed on the lower side of the spring mounting bracket 13, and FIGS. 12, 14, 16, 18, 20, 22, and 24 are viewed from the lower side. Although illustrated, the embodiment of FIGS. 2 and 3 is formed by bending the front edge of the spring mounting bracket 13 in the lateral direction, and the installation position of the bent plate portion 25 is not limited to the illustration.

切替カム溝２４のアームレスト４の下方回動方向側（後側）にはシャフト７の軸心方向と略平行に前記アンロック用カム面２２を形成し、切替カム溝２４のアームレスト４の上方回動方向側（前側）には切替カム溝２４の開口方向（左方向）に至るに従いアンロック用カム面２２（後側）に近づくように傾斜させて案内カム面２３を形成する。
案内カム面２３の先端とアンロック用カム面２２の外端縁との間には自由端２０が通り抜け可能な隙間２６を設ける。 The unlock cam surface 22 is formed substantially parallel to the axial direction of the shaft 7 on the downward rotation direction side (rear side) of the armrest 4 of the switching cam groove 24. On the moving direction side (front side), a guide cam surface 23 is formed by being inclined so as to approach the unlocking cam surface 22 (rear side) in the opening direction (left direction) of the switching cam groove 24.
A gap 26 through which the free end 20 can pass is provided between the tip of the guide cam surface 23 and the outer edge of the unlock cam surface 22.

アンロック用カム面２２に続く屈曲板部２５は、後側に至るに従い屈曲板部２５の基部側（右側）に近づく傾斜面２７に形成している。
一方、シャフト７の大径部４１の端部には、アームレスト４の回動により移動する自由端２０が当接する当接部材３０を設ける。当接部材３０は、シャフト７の軸心に対して交差方向の板部材３１をシャフト７の大径部４１の端部に固定し、板部材３１には切替カム溝２４に自由端２０を嵌合させるアンロック用当接部３２を設ける。アンロック用当接部３２はロック状態の自由端２０に当接し、自由端２０をコイル部１２の緩み方向に移動させ、アンロック用当接部３２により押された自由端２０は案内カム面２３により案内されて切替カム溝２４に嵌合する（図１４、図１６）。 The bent plate portion 25 following the unlock cam surface 22 is formed on an inclined surface 27 that approaches the base side (right side) of the bent plate portion 25 as it reaches the rear side.
On the other hand, an abutting member 30 is provided at the end of the large-diameter portion 41 of the shaft 7 so that the free end 20 that moves as the armrest 4 rotates is abutted. The abutting member 30 fixes a plate member 31 intersecting with the axis of the shaft 7 to the end of the large diameter portion 41 of the shaft 7, and the free end 20 is fitted into the switching cam groove 24 on the plate member 31. An unlock contact portion 32 is provided. The unlocking contact portion 32 contacts the free end 20 in the locked state, moves the free end 20 in the loosening direction of the coil portion 12, and the free end 20 pushed by the unlocking contact portion 32 is the guide cam surface. 23 and is fitted into the switching cam groove 24 (FIGS. 14 and 16).

アンロック用当接部３２の端縁はアンロック用カム面２２の端縁と一致させ、アンロック用当接部３２の端縁まで自由端２０が案内カム面２３により案内されて移動すると、自由端２０はアンロック用当接部３２から外れて自由端２０それ自体の弾力によりアンロック用カム面２２に当接する（図１８）。
また、アンロック保持面３３に続く板部材３１の後側周縁には交差方向の外れ防止面３４を設ける。外れ防止面３４は、切替カム溝２４および板部材３１の周縁の何れもから自由端２０が外れて作動不能状態になるのを防止する。
即ち、外れ防止面３４を設けないと、自由端２０が切替カム溝２４に係合し、格納位置より過剰回動が可能になり、アームレスト４が元の位置に戻らないメカロック状態になるが、外れ防止面３４によりアームレスト４の過剰回動を停止させ、メカロックを防止する。 When the edge of the unlocking contact portion 32 coincides with the edge of the unlocking cam surface 22 and the free end 20 is guided and moved by the guide cam surface 23 to the edge of the unlocking contact portion 32, The free end 20 comes off the unlock contact portion 32 and abuts on the unlock cam surface 22 by the elasticity of the free end 20 itself (FIG. 18).
Further, a disengagement preventing surface 34 in the crossing direction is provided on the rear peripheral edge of the plate member 31 following the unlock holding surface 33. The disengagement prevention surface 34 prevents the free end 20 from being disengaged from both the switching cam groove 24 and the peripheral edge of the plate member 31 and becoming inoperable.
In other words, if the disengagement prevention surface 34 is not provided, the free end 20 engages with the switching cam groove 24 and can be rotated excessively from the retracted position, so that the armrest 4 does not return to the original position. Excessive rotation of the armrest 4 is stopped by the detachment prevention surface 34 to prevent mechanical lock.

この場合、アームレスト４がアームレスト４として本来使用される使用範囲Ａの上限位置までアームレスト４を上方回動させたとき自由端２０が切替カム溝２４に嵌合するように設定し、使用範囲Ａを越えた格納範囲Ｂでは常時自由端２０は切替カム溝２４に嵌合させてアンロック保持面３３により保持させる。 In this case, the armrest 4 is set so that the free end 20 is fitted in the switching cam groove 24 when the armrest 4 is rotated upward to the upper limit position of the use range A that is originally used as the armrest 4. In the storage range B beyond, the free end 20 is always fitted in the switching cam groove 24 and held by the unlock holding surface 33.

しかして、板部材３１の前側部分には前記切替カム溝２４のアンロック用カム面２２に係合している自由端２０をアンロック用カム面２２から離脱させて自由端２０を自由状態に復帰させるアンロック解除部３７を設ける（図２０、図２２）。アンロック解除部３７は板部材３１の前端部をバネ取付用ブラケット１３に向けて屈曲させ屈曲部３８を形成し、屈曲部３８の先端より基部に至るに従い前側（上方回動方向側）に傾斜する傾斜解除面３９を形成し、傾斜解除面３９はアンロック用カム面２２の端縁より一方側にまで位置させ、アンロック用カム面２２と当接部材３０とが相対的に移動することで自由端２０がアンロック解除部３７の傾斜解除面３９に案内されてアンロック用カム面２２（切替カム溝２４）より離脱させ、アンロック状態をロック可能状態にさせる。 Accordingly, the free end 20 engaged with the unlocking cam surface 22 of the switching cam groove 24 is detached from the unlocking cam surface 22 at the front portion of the plate member 31 to make the free end 20 free. An unlock release unit 37 for returning is provided (FIGS. 20 and 22). The unlocking portion 37 bends the front end portion of the plate member 31 toward the spring mounting bracket 13 to form a bent portion 38, and inclines forward (upward rotational direction side) from the tip of the bent portion 38 to the base portion. The tilt release surface 39 is formed, and the tilt release surface 39 is positioned to one side from the edge of the unlock cam surface 22 so that the unlock cam surface 22 and the contact member 30 move relatively. Thus, the free end 20 is guided by the inclination release surface 39 of the unlock release portion 37 and is separated from the unlock cam surface 22 (switching cam groove 24), thereby bringing the unlocked state into a lockable state.

（実施例の作用）
アームレスト４は略水平位置を含む使用範囲Ａで使用状態となり、使用範囲Ａではシャフト７中心に一旦最下方位置にアームレスト４を下方回動させると、ロック装置Ｌは作動状態となって、上方回動はできるが下方回動はロックして荷重を支持する。
したがって、一旦使用範囲Ａの最下方位置にアームレスト４を下方回動させてから、必要に応じてアームレスト４を上方回動させて、アームレスト４の高さ調節を行う。 (Operation of Example)
The armrest 4 is in a use state within a use range A including a substantially horizontal position. In the use range A, once the armrest 4 is pivoted downward to a lowermost position about the shaft 7, the lock device L is in an activated state, and the armrest 4 is turned upward. Can move, but locks downward rotation to support the load.
Therefore, the armrest 4 is once rotated downward to the lowest position in the use range A, and then the armrest 4 is rotated upward as necessary to adjust the height of the armrest 4.

次に、使用範囲Ａの最上位置までアームレスト４を上方回動させると、この位置がアームレスト４の下方回動をロックして荷重を支持する上側の限界位置であり、これを一旦越えると、格納範囲Ｂとなり、格納範囲Ｂでは上下何れの方向にもアンロック状態となる。 Next, when the armrest 4 is rotated upward to the uppermost position of the use range A, this position is the upper limit position that locks the downward rotation of the armrest 4 and supports the load. The range is B, and the storage range B is unlocked in any direction.

しかして、格納位置から使用状態にするには、前記のように、使用範囲Ａの一旦最下方位置にまでアームレスト４を下方回動させ、ロック装置Ｌを作動状態すればよく、その後は、前記の作動（操作）の反復となる。
このように、シャフト７の軸周りにアームレスト４を回動させるように構成した場合、シャフト７自体の取付部分に緩みがあって「がたつく」と、アームレスト４の先端は増幅されて左右に振れることになる。 Thus, in order to change to the use state from the storage position, the armrest 4 may be rotated downward to the lowest position of the use range A as described above, and the lock device L may be activated. The operation (operation) is repeated.
As described above, when the armrest 4 is configured to rotate around the axis of the shaft 7, if the mounting portion of the shaft 7 itself is loose and “rattles”, the tip of the armrest 4 is amplified and swings left and right. become.

即ち、製造および組立上の公差がシャフト７の取付部分に集中することで、例えば、シャフト７は平面視左右両側が前後に振れ、この振れがアームレスト４の先端の左右振れとなって出現する。
アームレスト４は、背凭シート３の背凭骨格フレーム５の側部に設けた背凭ブラケット６に、左右方向のシャフト７を軸心として上下回動自在に取付け、シャフト７の長さ方向の中間所定位置に段部４０を形成し、段部４０より一方側のシャフト７は大径部４１に形成し、段部４０より他方側のシャフト７は小径部４２に形成し、バネ取付用ブラケット１３の側板４３にはシャフト７の小径部４２の外径と同じ透孔４５を形成しているから、小径部４２を側板４３の透孔４５に挿通して、側板４３にシャフト７の段部４０を当接させる。 That is, when manufacturing and assembly tolerances are concentrated on the mounting portion of the shaft 7, for example, the shaft 7 swings back and forth on the left and right sides in plan view, and this swing appears as a left and right swing at the tip of the armrest 4.
The armrest 4 is attached to a dorsal bracket 6 provided on the side of the dorsal skeleton frame 5 of the dorsal seat 3 so as to be pivotable up and down around the shaft 7 in the left and right direction, and the middle of the shaft 7 in the longitudinal direction. A step portion 40 is formed at a predetermined position, the shaft 7 on one side of the step portion 40 is formed on the large diameter portion 41, and the shaft 7 on the other side of the step portion 40 is formed on the small diameter portion 42, and the spring mounting bracket 13 is formed. The side plate 43 is formed with the same through-hole 45 as the outer diameter of the small-diameter portion 42 of the shaft 7. Therefore, the small-diameter portion 42 is inserted into the through-hole 45 of the side plate 43, and the step portion 40 of the shaft 7 is inserted into the side plate 43. Abut.

小径部４２の先端には母線方向に切り欠いて係合溝４７と係合突起４８を円周方向に交互に複数形成し、プレート５０には係合突起４８に対応させて挿通孔５１を形成しているから、シャフト７の係合突起４８をプレート５０の各挿通孔５１に挿入する。 A plurality of engaging grooves 47 and engaging protrusions 48 are alternately formed in the circumferential direction by cutting out at the front end of the small diameter portion 42 in the generatrix direction, and through holes 51 are formed in the plate 50 corresponding to the engaging protrusions 48. Therefore, the engagement protrusion 48 of the shaft 7 is inserted into each insertion hole 51 of the plate 50.

シャフト７の係合溝４７の溝底の溝底面５２とプレート５０の何れか一方または両方には、溝底面５２またはプレート５０に対して所定の高さ（大きさ）のプロジェクション突起５３を形成しているから、側板４３の透孔４５に挿通したシャフト７は、シャフト７の小径部４２の係合突起４８をプレート５０の挿通孔５１に挿通させた状態で、シャフト７とプレート５０とに通電し、電流をプロジェクション突起５３に集中させて行うプロジェクション溶接する。 A projection protrusion 53 having a predetermined height (size) with respect to the groove bottom surface 52 or the plate 50 is formed on one or both of the groove bottom surface 52 and the plate 50 of the groove bottom of the engagement groove 47 of the shaft 7. Therefore, the shaft 7 inserted into the through hole 45 of the side plate 43 is energized to the shaft 7 and the plate 50 in a state where the engagement protrusion 48 of the small diameter portion 42 of the shaft 7 is inserted into the insertion hole 51 of the plate 50. Then, projection welding is performed by concentrating the current on the projection protrusion 53.

プロジェクション溶接すると、電流が集中したプロジェクション突起５３は高熱により溶解し、プロジェクション溶接の際の加圧により、シャフト７の段部４０がバネ取付用ブラケット１３の透孔４５の端面４６に当接し、シャフト７の溝底面５２とプレート５０とがプロジェクション突起５３が溶けた分密着するから、プロジェクション溶接後、プレート５０はバネ取付用ブラケット１３の側板４３に隙間無しで当接する。 When projection welding is performed, the projection protrusion 53 in which current is concentrated melts due to high heat, and the step 40 of the shaft 7 abuts against the end surface 46 of the through hole 45 of the spring mounting bracket 13 by pressurization during projection welding. Since the projection bottom 53 and the plate 50 are in close contact with each other as the projection projection 53 is melted, the plate 50 comes into contact with the side plate 43 of the spring mounting bracket 13 without any gap.

したがって、プロジェクション突起５３が潰れたことにより公差を吸収し、シャフト７の段部４０とバネ取付用ブラケット１３の透孔４５の端面４６と、プレート５０とバネ取付用ブラケット１３の側板４３との二か所は、図示は省略したグリス等の潤滑部材のみが介在するだけで、殆ど、隙間無しで当接し、シャフト７がバネ取付用ブラケット１３（背凭ブラケット６）に対してがたつくのを防止し、その結果、アームレスト４の先端が使用位置にて左右方向に振れるのを防止する。 Therefore, the projection projection 53 is crushed to absorb the tolerance, and the two parts of the stepped portion 40 of the shaft 7, the end face 46 of the through hole 45 of the spring mounting bracket 13, the plate 50, and the side plate 43 of the spring mounting bracket 13. The location only includes a lubricating member such as grease (not shown), and it almost contacts with no gap and prevents the shaft 7 from rattling against the spring mounting bracket 13 (back bracket 6). As a result, the tip of the armrest 4 is prevented from shaking in the left-right direction at the use position.

しかして、実施例では、バネ取付用ブラケット１３の側板４３には一方側に突き出る円筒形状のバーリング部４４を形成し、バーリング部４４の内径はシャフト７の小径部４２の外径が少し大きく形成しているから、小径部４２をバーリング部４４の透孔４５に挿通して、バーリング部４４の端面４６にシャフト７の段部４０を当接させる。 Therefore, in the embodiment, the side plate 43 of the spring mounting bracket 13 is formed with a cylindrical burring portion 44 protruding to one side, and the inner diameter of the burring portion 44 is formed so that the outer diameter of the small diameter portion 42 of the shaft 7 is slightly larger. Therefore, the small diameter portion 42 is inserted into the through hole 45 of the burring portion 44, and the stepped portion 40 of the shaft 7 is brought into contact with the end surface 46 of the burring portion 44.

この場合、溝底面５２にプロジェクション突起５３を形成し、側板４３の外面から透孔４５の端面４６までの間隔を「Ｘ」とし、溝底面５２からのプロジェクション突起５３の高さを「Ｙ」とし、段部４０から溝底面５２までの間隔を「Ｚ」としたとき、「Ｘ＜Ｚ＋Ｙ」とし、溶接前は「Ｘ＜Ｚ＋Ｙ」としたとき、溶接時にプロジェクション突起５３が潰れて溶接後のプロジェクション突起５３の高さが「Ｙ’」に変化し、これにより「Ｘ＝Ｚ＋Ｙ’」となるように構成しているから、適切な電流値等の熔接条件および加圧力による熔接中にプロジェクション突起５３が潰れることで、潰れたプロジェクション突起５３の高さＹ’およびシャフト７の段部４０と溝底面５２の間隔Ｚがバーリング部４４の高さＸと一致して、プレート５０はバネ取付用ブラケット１３の側板４３に密着する。 In this case, the projection protrusion 53 is formed on the groove bottom surface 52, the distance from the outer surface of the side plate 43 to the end surface 46 of the through hole 45 is “X”, and the height of the projection protrusion 53 from the groove bottom surface 52 is “Y”. When the distance from the stepped portion 40 to the groove bottom surface 52 is “Z”, “X <Z + Y” is set, and when “X <Z + Y” is set before welding, the projection protrusion 53 is crushed during welding and the projection after welding Since the height of the protrusion 53 is changed to “Y ′” and thereby becomes “X = Z + Y ′”, the projection protrusion 53 is welded during welding by an appropriate welding condition such as current value and pressure. By collapsing, the height Y ′ of the collapsed projection projection 53 and the distance Z between the step portion 40 of the shaft 7 and the groove bottom surface 52 coincide with the height X of the burring portion 44, and the plate 50 In close contact with the side plate 43 of the mounting bracket 13.

したがって、可及的にバネ取付用ブラケット１３とシャフト７とプレート５０の隙間をゼロにして、アームレスト４の先端が左右に振れるのを防止する。 Therefore, the gaps between the spring mounting bracket 13, the shaft 7 and the plate 50 are set to zero as much as possible to prevent the tip of the armrest 4 from swinging left and right.

この場合、プロジェクション突起５３は潰れるが、溶解せずに必ず突起として残るように、プロジェクション突起５３の高さ「Ｙ」と適切な電流値等の熔接条件および加圧力とを設定しているので、「Ｘ＞Ｚ＋Ｙ’」となって回転不能状態になったり、バネ取付用ブラケット１３がシャフト７またはプレート５０に熔接されることも防止する。 In this case, although the projection protrusion 53 is crushed, the height “Y” of the projection protrusion 53 and the welding conditions such as an appropriate current value and the applied pressure are set so that the projection protrusion 53 remains without being melted. It is also possible to prevent “X> Z + Y ′” from being achieved and the spring mounting bracket 13 from being welded to the shaft 7 or the plate 50.

以上のように、何れの実施例でも、シャフト７とバネ取付用ブラケット１３とプレート５０の三者は隙間無しで当接するだけであるから、アームレスト４を回動させると、シャフト７およびプレート５０がバネ取付用ブラケット１３に対して回転するが、操作荷重は重くならず、操作性は犠牲にしないで、アームレスト４の先端が左右に振れるのを防止する。 As described above, in any of the embodiments, the shaft 7, the spring mounting bracket 13, and the plate 50 are in contact with each other without a gap. Therefore, when the armrest 4 is rotated, the shaft 7 and the plate 50 are Although it rotates relative to the spring mounting bracket 13, the operation load is not increased, and the operability is not sacrificed, and the tip of the armrest 4 is prevented from swinging left and right.

即ち、シャフト７とバネ取付用ブラケット１３とプレート５０の三者の夫々が有する公差を、突起５３が溶接時に潰れることで吸収するように構成しているので、三者を夫々隙間無しで当接させて、回動させる際の抵抗を増加させずに、「がたつき」を防止したのである。 That is, since the projection 53 is crushed at the time of welding, the three members of the shaft 7, the spring mounting bracket 13 and the plate 50 are configured to absorb the tolerances, so that the three members contact each other without a gap. Thus, “rattle” was prevented without increasing the resistance when rotating.

しかして、前記側板４３には一方側に突き出る円筒形状のバーリング部４４を形成し、バーリング部４４の端面４６にシャフト７の段部４０を当接させ、係合溝４７の溝底面５２をプレート５０の外面Ａに当接させた状態で通電してプロジェクション溶接するから、バーリング部４４とシャフト７の段部４０との当接によりシャフト７とバネ取付用ブラケット１３との位置決めが正確、且つ、設定用意となって、溶接を確実にする。
即ち、突起５３が溶接時に潰れるときの圧力（荷重）が、バーリング部４４の端面４６とシャフト７の段部４０の当接面に掛かり、両者の位置を互いに固定するように作用する。 Thus, the side plate 43 is formed with a cylindrical burring portion 44 protruding to one side, the stepped portion 40 of the shaft 7 is brought into contact with the end surface 46 of the burring portion 44, and the groove bottom surface 52 of the engaging groove 47 is formed on the plate. 50, the projection 7 is energized while being in contact with the outer surface A, so that the positioning of the shaft 7 and the spring mounting bracket 13 is accurate by the contact between the burring portion 44 and the stepped portion 40 of the shaft 7, and Setting ready to ensure welding.
That is, the pressure (load) when the projection 53 is crushed during welding is applied to the end surface 46 of the burring portion 44 and the contact surface of the stepped portion 40 of the shaft 7, so that the positions of both are fixed.

シートの側面図。The side view of a sheet | seat. ロック装置の分解斜視図。The disassembled perspective view of a locking device. 同一部拡大分解斜視図。The same part expansion exploded perspective view. シャフトとブラケットとプレートの分解図。Exploded view of shaft, bracket and plate. 同分解斜視図。The exploded perspective view. 同側面図。The same side view. 同低面図。The bottom view. シャフトの一部破断図。The partially broken view of a shaft. シャフトとブラケットとプレートの固定状態断面図。Sectional drawing of the fixed state of a shaft, a bracket, and a plate. シャフトとブラケットとプレートの固定方法の他の実施例図。The other Example figure of the fixing method of a shaft, a bracket, and a plate. アームレストと背凭骨格フレームの位置関係を示す側面図。The side view which shows the positional relationship of an armrest and a supine frame frame. 図１１のロック装置の斜視図。The perspective view of the locking device of FIG. アームレストと背凭骨格フレームの位置関係を示す側面図。The side view which shows the positional relationship of an armrest and a supine frame frame. 図１３のロック装置の斜視図。The perspective view of the locking device of FIG. アームレストと背凭骨格フレームの位置関係を示す側面図。The side view which shows the positional relationship of an armrest and a supine frame frame. 図１５のロック装置の斜視図。The perspective view of the locking device of FIG. アームレストと背凭骨格フレームの位置関係を示す側面図。The side view which shows the positional relationship of an armrest and a supine frame frame. 図１７のロック装置の斜視図。The perspective view of the locking device of FIG. アームレストと背凭骨格フレームの位置関係を示す側面図。The side view which shows the positional relationship of an armrest and a supine frame frame. 図１９のロック装置の斜視図。The perspective view of the locking device of FIG. アームレストと背凭骨格フレームの位置関係を示す側面図。The side view which shows the positional relationship of an armrest and a supine frame frame. 図２１のロック装置の斜視図。The perspective view of the locking device of FIG. アームレストと背凭骨格フレームの位置関係を示す側面図。The side view which shows the positional relationship of an armrest and a supine frame frame. 図２４のロック装置の斜視図。The perspective view of the locking device of FIG. 切替カム溝と当接部材の位置関係図。The positional relationship figure of a switching cam groove and a contact member. 公知例の課題を示す断面図。Sectional drawing which shows the subject of a well-known example.

Explanation of symbols

１…シート、２…座席シート、３…背凭シート、４…アームレスト、５…背凭骨格フレーム、６…背凭ブラケット、７…シャフト、８…アームレストフレーム、１０…カラー、１１…ロックスプリング、１２…コイル部、１３…バネ取付用ブラケット、１４…係合孔、１５…固定側端部、２０…自由端、２２…アンロック用カム面、２３…案内カム面、２４…切替カム溝、２５…屈曲板部、２６…隙間、２７…傾斜面、３０…当接部材、３１…板部材、３２…アンロック用当接部、３３…アンロック保持面、３４…外れ防止面、３７…アンロック解除部、３８…屈曲部、３９…傾斜解除面、４０…段部、４１…大径部、４２…小径部、４３…側板、４４…バーリング部、４５…透孔、４６…端面、４７…係合溝、４８…係合突起、５０…プレート、５１…挿通孔、５２…溝底面、５３…プロジェクション突起、５５…凹部。 DESCRIPTION OF SYMBOLS 1 ... Seat, 2 ... Seat seat, 3 ... Dorsal seat, 4 ... Armrest, 5 ... Dorsal skeleton frame, 6 ... Dorsal bracket, 7 ... Shaft, 8 ... Armrest frame, 10 ... Collar, 11 ... Lock spring, DESCRIPTION OF SYMBOLS 12 ... Coil part, 13 ... Spring mounting bracket, 14 ... Engagement hole, 15 ... Fixed side end, 20 ... Free end, 22 ... Unlocking cam surface, 23 ... Guide cam surface, 24 ... Switching cam groove, 25 ... Bent plate portion, 26 ... Gap, 27 ... Inclined surface, 30 ... Contact member, 31 ... Plate member, 32 ... Contact portion for unlocking, 33 ... Unlock holding surface, 34 ... Anti-detachment surface, 37 ... Unlock release part, 38 ... Bending part, 39 ... Inclination release surface, 40 ... Step part, 41 ... Large diameter part, 42 ... Small diameter part, 43 ... Side plate, 44 ... Burring part, 45 ... Through hole, 46 ... End face, 47 ... engaging groove, 48 ... engaging protrusion, 50 ... pre DOO, 51 ... insertion holes, 52 ... groove bottom surface, 53 ... projection projections, 55 ... recess.

Claims

A through hole of a cylindrical burring portion 44 formed so as to protrude to one side of a side plate 43 of a spring mounting bracket 13 fixed to the side of the back seat 3 of the seat 1 or to the armrest frame 9. 45, the shaft 7 in the left-right direction is inserted, and the stepped portion 40 formed at a predetermined intermediate position in the length direction of the shaft 7 is brought into contact with the end surface 46 of the burring portion 44, and the end portion of the shaft 7 is The engagement grooves 47 and the engagement protrusions 48 are alternately formed in the circumferential direction by cutting out substantially parallel to the axial direction of the shaft 7, and have a predetermined height and at least the groove bottom of the engagement groove 47. The engaging protrusions 48 are protruded from the side plate 43 so that the projection protrusions 53 formed on the groove bottom surface 52 abut against the outer surface A of the plate 50 while being crushed in the axial direction of the shaft 7. 3 is inserted into and engaged with the insertion hole 51 of the plate 50 abutted on the inner surface of the plate 3, and a concave portion 55 that is gradually recessed toward the burring portion 44 is formed on the side plate 43 of the portion where the burring portion 44 is provided. The plate 50 is brought into contact with the inclined surface gradually dented toward the stepped portion 40 of the shaft 7 as approaching the burring portion 44 in 55 , and between the groove bottom surface 52 of the shaft 7 and the outer surface A of the plate 50. In a state where the projection projection 53 is in contact, projection welding is performed by applying a predetermined current to the projection projection 53 to pressurize it, and after welding, the plate 50 is brought into contact with the side plate 43 of the spring mounting bracket 13 without a gap. The shaft 7 and the plate 50 are fixed, and the armrest 4 is attached so that the tip is rotatable up and down around the shaft 7 axis. A method of attaching the Muresuto.

In the through hole 45 of the side plate 43 of the spring mounting bracket 13 that is fixed to the back bracket 6 or the armrest frame 9 provided on the side portion of the back seat 3 of the seat 1, the shaft 7 is placed at a predetermined intermediate position in the longitudinal direction of the shaft 7. The shaft 7 is inserted so that the formed stepped portion 40 abuts the outer surface of the side plate 43, and the engaging groove 47 and the engaging protrusion 48 are cut out at the end of the shaft 7 substantially parallel to the axial direction of the shaft 7. Are alternately formed in the circumferential direction, and the engagement protrusions 48 of the engagement grooves 47 and the engagement protrusions 48 are inserted and engaged with the insertion holes 51 of the plate 50 abutted against the inner surface of the side plate 43. A projection projection 53 formed with a predetermined height on either or both of the groove bottom surface 52 of the groove bottom of the engagement groove 47 of the shaft 7 and the plate 50 of the portion where the groove bottom surface 52 abuts. , Groove bottom 52 or / and A cylindrical burring portion 44 protruding to one side is formed on the side plate 43 in contact with the plate 50, and the stepped portion 40 of the shaft 7 is brought into contact with the end surface 46 of the burring portion 44 to provide the burring portion 44. A concave portion 55 that is gradually recessed as the burring portion 44 is approached is formed in the side plate 43 of the portion, and the plate is formed on an inclined surface that is gradually recessed toward the step portion 40 of the shaft 7 as the burring portion 44 in the recess 55 is approached. 50, the groove bottom surface 52 of the engaging groove 47 is in contact with the outer surface A of the plate 50, and the side plate 43 is sandwiched between the step portion 40 of the shaft 7 and the plate 50 without any gap by projection welding. Armrest mounting method for fixing the shaft 7 and the plate 50 by welding while crushing the projection projection 53 in the axial direction of the shaft 7

The projection protrusion 53 is formed on at least the groove bottom surface 52, the distance from the outer surface of the side plate 43 to the end surface 46 of the through hole 45 is “X”, and the projection protrusion from the groove bottom surface 52 is defined in claim 1 or claim 2. When the height of 53 is “Y”, the distance from the stepped portion 40 to the groove bottom surface 52 is “Z”, and “X <Z + Y” before welding, the projection projection 53 is crushed and welded. The armrest mounting method is configured such that the projection protrusion 53 has a height “Y ′” afterward, and thereby becomes “X = Z + Y ′”.

The armrest 4 is attached to a dorsal bracket 6 provided on the side portion of the dorsal seat 3 of the seat 1 so that the tip can be rotated up and down around the shaft 7 in the left-right direction. A step portion 40 is formed at a predetermined intermediate position in the length direction. The shaft 7 on one side of the step portion 40 is formed on the large diameter portion 41, and the shaft 7 on the other side of the step portion 40 is formed on the small diameter portion 42. A plurality of engaging grooves 47 and engaging protrusions 48 are alternately formed in the circumferential direction by cutting out at the tip of the small diameter portion 42 substantially in parallel with the axial direction of the shaft 7, and the dorsal bracket 6 or the armrest 4. The side plate 43 of the spring mounting bracket 13 fixed to the armrest frame 9 is formed with a cylindrical burring portion 44 having an end surface 46 projecting to one side and abutting the stepped portion 40 of the shaft 7. Forms the same hole 45 to the outer diameter of the small diameter portion 42 of the shaft 7, the side plates 43 of the formed portion burring portion 44, the a recess 55 progressively recessed gets closer to the burring portion 44, recess 55 A plate 50 having an insertion hole 51 through which the engagement protrusion 48 is inserted and engaged is brought into contact with an inclined surface gradually recessed toward the stepped portion 40 of the shaft 7 as the burring portion 44 approaches the burring portion 44 . A projection having a predetermined height even after welding which is crushed in the axial direction of the shaft 7 on either or both of the groove bottom surface 52 of the groove bottom of the engaging groove 47 and the plate 50 where the groove bottom surface 52 abuts. The projection bottom 53 of the engagement groove 47 is brought into contact with the outer surface A of the plate 50 so that a part of the plate 50 is in close contact with the side plate 43. Mounting structure of armrest for projection welding energized in a state where the.

5. The projection projection 53 is formed on at least the groove bottom surface 52, the distance from the outer surface of the side plate 43 to the end surface 46 of the through hole 45 is “X”, and the height of the projection projection 53 from the groove bottom surface 52 is defined. Is “Y”, the distance from the stepped portion 40 to the groove bottom surface 52 is “Z”, and “X <Z + Y” before welding, the height of the projection projection 53 changes to “Y ′” by welding. The armrest mounting structure configured to satisfy “X = Z + Y ′”.