JP4202688B2

JP4202688B2 - Chair seat structure

Info

Publication number: JP4202688B2
Application number: JP2002213450A
Authority: JP
Inventors: 直樹沼; 僚五十嵐
Original assignee: Okamura Corp
Current assignee: Okamura Corp
Priority date: 2002-07-23
Filing date: 2002-07-23
Publication date: 2008-12-24
Anticipated expiration: 2022-07-23
Also published as: JP2004049684A

Description

【０００１】
【発明の属する技術分野】
本発明は、座枠に、弾性変形可能なネット部材もしくは多孔性シート部材の周縁部を取り付けた椅子の座構造（背当てを含む）に関する。
【０００２】
【従来の技術】
通常は方形状をなす座枠に、高張力のプラスチック材等よりなる弾性変形可能なネット部材もしくは多孔性シート部材の周縁部を取り付けた椅子の座構造は公知である。
【０００３】
【発明が解決しようとする課題】
上記座枠における枠杆は、通常、角型断面をなしており、ネット部材もしくは多孔性シート部材の周縁を支持するべきその上面は、概ね平坦である。
【０００４】
そのため、ネット部材（以下、多孔性シート部材を含む）の周縁部は、座枠の上面もしくは前面の全体にわたって当接重合し、ネット部材に着席者の荷重が掛かると、ネット部材は撓んで、その周縁部は、座枠を構成する枠杆の上面もしくは前面の内周角部に、強く当接することとなる。
【０００５】
そのため、枠杆の内周角部に応力が集中して負荷され、この部分が摩耗したり傷んだりするとともに、着席者の尻や太ももまたは背等が、枠杆の内周角部に当たって、着席者に不快感を与えることとなる。
【０００６】
また、ネット部材は撓み易く、使用に伴ってたるんだネット部材は、着座者に不快感と不安定感を与え、かつたるんだネット部材の周縁部は、枠杆の内周角部に沿って、折れ曲がって凹入するので、この折れ曲がり部が目立ち、体裁が損われる。
【０００７】
さらに、座枠にネット部材の周縁部を止着した従来の椅子の座構造においては、ネット部材を透して座枠の内側面が見えるので、体裁は良くない。
【０００８】
【課題を解決するための手段】
本発明は、座枠にネット部材の周縁部を止着した椅子の座構造における上述のような問題点を解消することを目的とするもので、その具体的手段は、次の如くである。
(１) 座枠の上面にネット部材（多孔性シート部材を含む）を張設した椅子の座構造において、座枠を、外周部に剛質部を有するとともに、その前部の上面に、上向円弧状に緩く湾曲し、かつ内側方向を向く弾性変形可能な水平方向の張出片を設けたものとし、前記張出片の中央部を両側部に比して後方に長く形成するとともに、その両側方の後縁を前方に向かって凹入する平面視円弧状とし、さらに、前記張出片に、その後縁から前方を向く複数の切込溝または可撓溝を設けることにより、隣接する切込溝または可撓溝間を弾性的に下傾しうる可撓性舌片とするとともに、前記張出片における中央部の後方に長く形成した部分の可撓性舌片の幅を、その両側部の可撓性舌片の幅より大とし、前記張出片の上面と座枠の剛質部の上面とに亘って、ネット部材の周辺部を張設する。
【０００９】
(２) 上記(１)項において、張出片を、座枠の内周全域に設け、座枠の前部における張出片を、側部および後部のものより長寸とする。
【００１０】
( ３ ) 上記( １ ) または ( ２ )項において、切込溝の奥端に、切込みが進行するのを防止するための停止孔を設ける。
【００１１】
( ４ ) 上記( １ ) 〜 ( ３ )項のいずれかにおいて、可撓性舌片に、可撓用薄肉部を設ける。
【００１２】
【発明の実施の形態】
本発明は、図１および図２に示す椅子(Ａ)の座シート(Ｂ)にも、背当て(Ｃ)にも等しく適用しうるものであるが、以下これを、座シート(Ｂ)に適用した例を示す図３〜図５に基いて説明する。
【００１３】
座シート(Ｂ)は、所望の形状をなす閉結枠状の座枠(１)の周縁部の上面および外側縁に、それと対応する形状寸度を有する高張力の合成樹脂からなるネット部材(２)の周縁部を重合し、かつ座枠(１)の下面に、それと対応する平面形を有する締付枠(３)を、重合して止着したものである。
【００１４】
座枠(１)は、硬質プラスチックもしくは適宜の金属からなり、外周部に設けた厚肉の剛質部(４)の上面内周部に、全周に亘って、緩い下向きの円弧状をなして、内方を向くほぼ水平の薄肉の張出片(５)を連設したものである。
【００１５】
座枠(１)の前部における張出片(5a)は、側部および後部のものに比してかなり長寸であり、かつその中央部は、両側部に比して、長寸とされている。側部および後部には、張出片(５)を設けないこともある。
【００１６】
前部における張出片(５)には、その後縁から前方を向く複数の切込溝(６)を設けることにより、隣接する切込溝(６)(６)の間を、弾性的に下傾しうる可撓性舌片(７)としてある。
【００１７】
可撓性舌片(７)の可撓性を所望のものとするために、その厚さを、先端方向へ向かって、漸次小とすることもある。
【００１８】
なお、各切込溝(６)の奥端には、その切り進みを防止するために、その幅より大径の円状の停止孔(８)を設けてある。
【００１９】
各可撓性舌片(７)の先端縁には、剛性保持と補強のための下向き膨出部(９)を設けておくのがよい。
【００２０】
座枠(１)の内周各部における下向き円弧状の張出片(５)の上下位置、上下方向、および曲率は、その上に張設されるネット部材(２)の周辺部が、各張出片(５)の上面にほぼ当接するように定められている。
【００２１】
各張出片(５)の先端部すなわち内縁部の曲率を、他の部分よりやや小とし、ネット部材(２)の周辺部が張出片(５)の上面に当接した際においても、張出片(５)の先端とネット部材(２)との間に、若干の隙間が残るようにしておくのがよい。
【００２２】
外周の厚肉の剛質部(４)の適所には、下面からねじ孔(10)があけられている。
【００２３】
切込溝(６)の代わりに、断面Ｖ状の多数の可撓溝を設けて、その間を可撓性舌片(７)とすることもある。
【００２４】
可撓性舌片(７)の可撓性を所望のものとするために、その適所に側方向その他の方向を向く薄肉部や波形屈曲部を付しておくこともある。
【００２５】
締付枠(３)は、プラスチックを成形して形成され、その上面は、座枠(１)の厚肉の外周剛質部(４)の下面との間に、ネット部材(２)の周辺部を、漸次締め込み気味で挟み込みうるような形状とされている。締付枠(３)における座枠(１)の前記ねじ孔(10)と対応する個所には、ボルト(11)挿通孔(12)があけられている。
【００２６】
組み付けるには、ネット部材(２)を座枠(１)上に重合するとともに、ネット部材(２)の周辺部を、座枠(１)の外周剛質部(４)に沿って下方へ曲げた後、座枠(１)の外周剛質部(４)の下面に重合し、ついで下方から締付枠(３)を当接することにより、ネット部材(２)の折り曲げられた下縁を締め込み、挿通孔(12)へ挿入したボルト(11)を、座枠(１)の下面のねじ孔(10)へ螺合する。
【００２７】
かくして、ネット部材(２)の周辺部は、弾性撓曲可能な張出片(５)の上面を介して、外周剛質部(４)に支持され、かつこの際、ネット部材(２)の周辺部は、張出片(５)の内周部の上面にほぼ当接する。
【００２８】
着席者の荷重が作用すると、図５に示すように、ネット部材(２)の周辺部は、張出片(５)に当接して下方へ撓む。
【００２９】
【発明の効果】
各請求項に記載の発明の効果は、次の通りである。
請求項１：ネット部材の前部は、張出片の上面をやや弾圧気味で張設されるので、体裁は良く、またネット部材に着席者の負荷が掛かった際、図５に示すように、ネット部材の前部は張出片を弾圧し、ネット部材に、適度の弾性と復元力が与えられる。
また、張出片の存在により、それを支持する座枠の前部の剛質部が、ネット部材を透して直接見えることはなく、体裁が良い。
【００３０】
さらに、張出片の中央部を両側部に比して後方に長く形成するとともに、その両側方の後縁を前方に向かって凹入する平面視円弧状とし、また張出片に複数の切込溝または可撓溝を設けることにより、隣接する切込溝または可撓溝間を弾性的に下傾しうる可撓性舌片とし、各可撓性舌片が独立して撓むようにしてあるので、着座者の太ももの裏がバランスよく弾性保持され、着席者は、ネット部材を介して、快適に支持される。
なお、可撓性舌片の側縁を可撓溝とした場合は、隣接する可撓性舌片の間に、異物が挟まったり、また舌片同士の傾斜が大きく異なるものとなって、体裁を損うことはない。
【００３１】
請求項２：ネット部材の全周が、張出片により弾性支持されるとともに、着席者の荷重が最も頻繁に作用する座枠の前部における張出片を、側部および後部のものより長寸としてあるので、着席者をバランスよく支持することができる。
【００３２】
請求項３：再三の使用によっても、可撓性舌片の側部の切込溝が、一定以上に切り込んで、張出片を損壊することはない。
【００３３】
請求項４：可撓性舌片の各部における可撓性を任意に定めることができる。
【図面の簡単な説明】
【図１】本発明の一実施形態を適用した椅子の正面図である。
【図２】同じく側面図である。
【図３】本発明の椅子の座構造の一実施形態の下方分解斜視図である。
【図４】本発明の椅子の座構造の一実施形態の不使用時における縦断側面図である。
【図５】本発明の椅子の座構造の一実施形態の使用時における縦断側面図である。
【符号の説明】
(Ａ)椅子
(Ｂ)座シート
(Ｃ)背当て
(１)座枠
(２)ネット部材
(３)締付枠
(４)剛質部
(５)(5a)張出片
(６)切込溝
(７)可撓性舌片
(８)停止孔
(９)下向き膨出部
(10)ねじ孔
(11)ボルト
(12)挿通孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat structure (including a backrest) for a chair in which an elastically deformable net member or a peripheral portion of a porous sheet member is attached to a seat frame.
[0002]
[Prior art]
A seat structure of a chair in which an elastically deformable net member made of a high-tensile plastic material or the like, or a peripheral edge portion of a porous sheet member, is attached to a seat frame that is usually rectangular.
[0003]
[Problems to be solved by the invention]
The frame rod in the seat frame usually has a square cross section, and the upper surface to support the periphery of the net member or porous sheet member is generally flat.
[0004]
Therefore, the peripheral part of the net member (hereinafter including the porous sheet member) is abutted and polymerized over the entire upper surface or front surface of the seat frame, and when the load of the seated person is applied to the net member, the net member is bent, The peripheral edge strongly comes into contact with the upper peripheral surface or the inner peripheral corner of the front surface of the frame frame constituting the seat frame.
[0005]
Therefore, stress is concentrated and applied to the inner peripheral corner of the frame rod, and this portion is worn or damaged, and the seater's buttocks, thighs or back hits the inner peripheral corner of the frame rod and sits down. It will be uncomfortable for the person.
[0006]
In addition, the net member is easy to bend, and the slack net member with use gives the seated person discomfort and instability, and the slack net member has a peripheral edge along the inner peripheral corner of the frame rod. Since it is bent and recessed, this bent portion is conspicuous and the appearance is damaged.
[0007]
Furthermore, in the conventional seat structure of the chair in which the periphery of the net member is fixed to the seat frame, the inner surface of the seat frame can be seen through the net member, so the appearance is not good.
[0008]
[Means for Solving the Problems]
An object of the present invention is to solve the above-described problems in the seat structure of a chair in which the peripheral edge of a net member is fixed to a seat frame, and specific means are as follows.
(1) In a seat structure of a chair in which a net member (including a porous sheet member) is stretched on the upper surface of the seat frame, the seat frame has a rigid portion on the outer peripheral portion, It is assumed that a horizontal projecting piece that is gently curved in a circular arc shape and that can be elastically deformed facing inward is provided, and the center part of the projecting piece is formed to be longer rearward than both side parts, The rear edges on both sides are arcuate in a plan view that is recessed forward, and the protruding pieces are adjacent by providing a plurality of cut grooves or flexible grooves facing the front from the rear edges. A flexible tongue that can be inclined elastically downward between the cut groove or the flexible groove, and the width of the flexible tongue that is long at the rear of the central portion of the protruding piece is large cities than the width of the flexible tongue on both sides, over the upper surface of the rigid portion of the upper surface and the seat frame of the protruding tabs To stretched the peripheral portion of the net member.
[0009]
(2) In the above item (1), the overhanging piece is provided over the entire inner periphery of the seat frame, and the overhanging piece in the front part of the seat frame is longer than those in the side part and the rear part.
[0010]
( 3 ) In the above ( 1 ) or ( 2 ) , a stop hole is provided at the back end of the cut groove to prevent the cut from progressing.
[0011]
( 4 ) In any one of the above items ( 1 ) to ( 3 ) , a flexible thin-walled portion is provided on the flexible tongue piece.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is equally applicable to the seat (B) and backrest (C) of the chair (A) shown in FIGS. 1 and 2, but this is hereinafter applied to the seat (B). This will be described with reference to FIGS.
[0013]
The seat sheet (B) is a net member made of a high-strength synthetic resin having a shape size corresponding to the upper surface and the outer edge of the peripheral edge of the closed frame-shaped seat frame (1) having a desired shape. The peripheral edge of 2) is superposed, and the fastening frame (3) having a flat shape corresponding to the underside of the seat frame (1) is superposed and fastened.
[0014]
The seat frame (1) is made of hard plastic or an appropriate metal, and has a gentle downward circular arc on the entire inner periphery of the upper surface of the thick rigid portion (4) provided on the outer periphery. Thus, a thin, almost horizontal protruding piece (5) facing inward is provided.
[0015]
The overhanging piece (5a) at the front part of the seat frame (1) is considerably longer than those at the side part and the rear part, and its central part is longer than both sides. ing. The overhanging piece (5) may not be provided on the side portion and the rear portion.
[0016]
The projecting piece (5) at the front portion is provided with a plurality of cut grooves (6) facing forward from the rear edge, thereby elastically lowering between the adjacent cut grooves (6) and (6). As a flexible tongue (7) which can be tilted.
[0017]
In order to obtain the desired flexibility of the flexible tongue piece (7), its thickness may be gradually reduced toward the distal end.
[0018]
In addition, a circular stop hole (8) having a diameter larger than its width is provided at the back end of each cut groove (6) in order to prevent the cut advance.
[0019]
It is preferable to provide a downward bulging portion (9) for maintaining rigidity and reinforcing the tip edge of each flexible tongue piece (7).
[0020]
The vertical position, the vertical direction, and the curvature of the downward arcuate projecting piece (5) at each inner peripheral part of the seat frame (1) are determined by the peripheral part of the net member (2) stretched thereon. It is determined so as to substantially contact the upper surface of the protruding piece (5).
[0021]
Even when the curvature of the tip portion, that is, the inner edge portion of each overhanging piece (5) is made slightly smaller than the other parts, and the peripheral part of the net member (2) is in contact with the upper surface of the overhanging piece (5), It is preferable to leave a slight gap between the tip of the overhanging piece (5) and the net member (2).
[0022]
A screw hole (10) is formed from a lower surface at a suitable position of the thick rigid portion (4) on the outer periphery.
[0023]
Instead of the cut groove (6), a plurality of flexible grooves having a V-shaped cross section may be provided, and a flexible tongue piece (7) may be formed between them.
[0024]
In order to obtain the desired flexibility of the flexible tongue piece (7), a thin-walled portion or a corrugated bent portion that faces in the lateral direction or other directions may be provided at an appropriate position.
[0025]
The fastening frame (3) is formed by molding plastic, and the upper surface is between the lower surface of the thick outer peripheral rigid part (4) of the seat frame (1) and the periphery of the net member (2). The part is shaped so that it can be sandwiched gradually. A bolt (11) insertion hole (12) is formed at a position corresponding to the screw hole (10) of the seat frame (1) in the tightening frame (3).
[0026]
To assemble, the net member (2) is superposed on the seat frame (1) and the periphery of the net member (2) is bent downward along the outer peripheral rigid portion (4) of the seat frame (1). After that, it is superposed on the lower surface of the outer peripheral rigid portion (4) of the seat frame (1), and then the clamp frame (3) is contacted from below to tighten the bent lower edge of the net member (2). The bolt (11) inserted into the insertion hole (12) is screwed into the screw hole (10) on the lower surface of the seat frame (1).
[0027]
Thus, the peripheral portion of the net member (2) is supported by the outer rigid portion (4) via the upper surface of the elastically bendable projecting piece (5), and at this time, the net member (2) The peripheral part substantially contacts the upper surface of the inner peripheral part of the overhanging piece (5).
[0028]
When a seated person's load acts, as shown in FIG. 5, the peripheral part of a net member (2) will contact | abut to an overhang | projection piece (5), and will bend below.
[0029]
【The invention's effect】
The effects of the invention described in each claim are as follows.
Claim 1: Since the front part of the net member is stretched over the upper surface of the overhanging piece with a slight elasticity, the appearance is good, and when the seat member is loaded on the net member, as shown in FIG. The front part of the net member represses the overhanging piece, and appropriate elasticity and restoring force are given to the net member.
Also, the presence of overhanging piece, rigid portion of the front of the seat frame for supporting that it is not possible to look directly it through the net member, appearance is good.
[0030]
Furthermore, the center part of the projecting piece is formed to be longer rearward than both side parts, and the rear edge on both sides is formed into an arc shape in a plan view that is recessed forward, and the projecting piece has a plurality of cuts. By providing a cut groove or a flexible groove, a flexible tongue piece can be elastically inclined between adjacent cut grooves or flexible grooves, and each flexible tongue piece is bent independently. The back of the thigh of the seated person is elastically held in a well-balanced manner, and the seated person is comfortably supported through the net member.
When the side edge of the flexible tongue piece is a flexible groove, foreign matter may be caught between adjacent flexible tongue pieces, or the inclination of the tongue pieces may be greatly different. Will not be damaged.
[0031]
Claim 2: the entire periphery of the net member, by Ri together are elastic supported overhanging piece, a protruding piece in front of the seat frame load of the occupant is applied most frequently, the sides and rear of the Since it is longer than the thing, it can support the seated person in a balanced manner.
[0032]
According to the third aspect of the present invention , the cut groove on the side portion of the flexible tongue piece is not cut more than a certain amount and the projecting piece is not damaged.
[0033]
Claim 4 : The flexibility of each part of the flexible tongue can be arbitrarily determined.
[Brief description of the drawings]
FIG. 1 is a front view of a chair to which an embodiment of the present invention is applied.
FIG. 2 is a side view of the same.
FIG. 3 is a lower exploded perspective view of one embodiment of the chair seat structure of the present invention.
FIG. 4 is a longitudinal side view of the chair seat structure according to the embodiment of the present invention when not in use.
FIG. 5 is a longitudinal side view of the chair seat structure according to the embodiment of the present invention when used.
[Explanation of symbols]
(A) Chair
(B) Seat seat
(C) Back support
(1) Seat frame
(2) Net members
(3) Tightening frame
(4) Rigid part
(5) (5a) Overhang piece
(6) Cut groove
(7) Flexible tongue
(8) Stop hole
(9) downward bulge
(10) Screw hole
(11) Bolt
(12) Insertion hole

Claims

In the seat structure of a chair in which a net member (including a porous sheet member) is stretched on the upper surface of the seat frame, the seat frame has a rigid portion on the outer peripheral portion, and an upward arc shape on the upper surface of the front portion. A horizontal overhanging piece that is loosely curved and that can be elastically deformed inwardly, and that the central portion of the overhanging piece is formed to be longer rearward than both sides, Adjacent cut grooves are formed by forming a plurality of cut grooves or flexible grooves facing the front from the rear edge of the projecting piece in a circular arc shape in a plan view with the rear edge recessed into the front. Alternatively, a flexible tongue piece that can be elastically inclined between the flexible grooves is formed, and the width of the flexible tongue piece formed long behind the center portion of the projecting piece is set to the width of the both side portions. large cities than the width of the flexible tongue, over the upper surface of the rigid portion of the upper surface and the seat frame of the projecting pieces, Ne Seat structure of the chair, characterized in that it has stretched the periphery of the bets member.

2. The seat structure of a chair according to claim 1, wherein the overhanging piece is provided in the entire inner periphery of the seat frame, and the overhanging piece in the front part of the seat frame is longer than that of the side part and the rear part. .

The seat structure for a chair according to claim 1 or 2, wherein a stop hole for preventing the incision from proceeding is provided at the back end of the incision groove.

The seat structure of the chair according to any one of claims 1 to 3 , wherein a thin portion for flexibility is provided on the flexible tongue piece.