JP4514483B2 - Seat cushion frame structure - Google Patents

Seat cushion frame structure Download PDF

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JP4514483B2
JP4514483B2 JP2004074108A JP2004074108A JP4514483B2 JP 4514483 B2 JP4514483 B2 JP 4514483B2 JP 2004074108 A JP2004074108 A JP 2004074108A JP 2004074108 A JP2004074108 A JP 2004074108A JP 4514483 B2 JP4514483 B2 JP 4514483B2
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frame
surface plate
seat
seat cushion
resin
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JP2005261468A (en
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義文 田岡
真司 賀佐見
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Daihatsu Motor Co Ltd
Daikyo Nishikawa Corp
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Daihatsu Motor Co Ltd
Daikyo Nishikawa Corp
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Description

本発明はシートクッションのフレーム構造に関し、特に樹脂製のシートフレーム上にクッションパッドを配置して構成されるシートクッションにおけるフレーム構造に関するものである。   The present invention relates to a frame structure of a seat cushion, and more particularly to a frame structure in a seat cushion configured by disposing cushion pads on a resin seat frame.

従来の自動車用シートにおいては、着座者の良好な座り心地を確保するために、鋼板製の枠状フレームの開口部に、この開口部を左右方向に横断する金属製のＳばねと呼ばれる弾性支持部材を前後方向に間隔をあけて複数配設し、この枠状フレーム上に発泡合成樹脂等からなるクッションパッドを配置し、さらにその表面をシートクッションカバーで被覆して構成したものが汎用されている。   In a conventional automobile seat, in order to ensure a good seating comfort for a seated person, an elastic support called a metal S spring that crosses the opening in the left-right direction is provided at the opening of a steel frame. A plurality of members are arranged at intervals in the front-rear direction, a cushion pad made of foamed synthetic resin, etc. is placed on this frame-like frame, and the surface is covered with a seat cushion cover. Yes.

ところが、金属製の弾性支持部材とクッションパッドの組み合わせ構造では、弾性支持部材は面的に弾性支持するものでないため、着座時の撓みや振動吸収性に関して連続感が得られず、座り心地が良くないことがある。これを避けるため、クッションパッドと弾性支持部材の間に粗毛フェルト等の面一化部材を組み込むこともあるが、コスト高になりかつクッションパッドの持つしなやかさが損なわれる場合があるという問題がある。   However, in the combined structure of the metal elastic support member and the cushion pad, the elastic support member does not elastically support the surface, so that it is not possible to obtain a continuity with respect to bending and vibration absorption at the time of sitting, and the sitting comfort is good. There may not be. In order to avoid this, a flattened member such as coarse felt may be incorporated between the cushion pad and the elastic support member, but there is a problem that the cost increases and the flexibility of the cushion pad may be impaired. .

このような問題を解消するものとして、本出願人は先に、図５に示すように、着座支持面を構成する上面板２２とその周縁から下方に垂下する周面板２３とを一体的に成形して成り、その上面板２２と周面板２３との間にわたって連続する凹溝部２４を、上面板２２の両側の互いに対向する箇所に少なくとも１対設けている樹脂製のシートフレーム２１を提案している（例えば、特許文献１参照。）。   In order to solve such a problem, the applicant previously molded the upper surface plate 22 constituting the seating support surface and the peripheral surface plate 23 depending downward from the periphery thereof as shown in FIG. Proposing a resin seat frame 21 having at least one pair of concave groove portions 24 extending between the upper surface plate 22 and the peripheral surface plate 23 at opposite positions on both sides of the upper surface plate 22. (For example, refer to Patent Document 1).

このシートフレーム２１の支持構造について、図６を参照して説明すると、シートフレーム２１の前部両側隅部近傍と後部両側隅部近傍にそれぞれ取付部２５が上面板２２から凹入成形されかつその底部にナット部材（図示せず）がインサート成形にて一体的に固着されている。２７ａ、２７ｂはシートフレム２１を支持する左右のシートレール装置で、それぞれロアレール２８とアッパレール２９にて構成されており、ロアレール２８が車室の床部上に固定設置されている。アッパレール２９の前部と後部にはシートフレーム２１を固定するための支持部３０が設けられ、この支持部３０上にシートフレーム２１の取付部２５を載せ、取付ボルト３１を支持部３０に形成された取付穴を貫通させてナット部材（図示せず）に螺合し、締結固定することでシートフレーム２１がシートレール装置２７ａ、２７ｂに設置されている。   The support structure of the seat frame 21 will be described with reference to FIG. 6. The attachment portions 25 are recessedly formed from the upper surface plate 22 in the vicinity of the front side corners and the rear side corners of the seat frame 21. A nut member (not shown) is integrally fixed to the bottom by insert molding. 27a and 27b are left and right seat rail devices that support the seat frame 21 and are respectively composed of a lower rail 28 and an upper rail 29. The lower rail 28 is fixedly installed on the floor of the passenger compartment. Support portions 30 for fixing the seat frame 21 are provided at the front and rear portions of the upper rail 29, and the mounting portion 25 of the seat frame 21 is placed on the support portion 30, and mounting bolts 31 are formed on the support portion 30. The seat frame 21 is installed in the seat rail devices 27a and 27b by passing through the mounting holes, screwing into a nut member (not shown), and fastening.

このような構成によれば、着座者の荷重がクッションパッドを介して上面板２２上に加わると、その荷重が上面板２２及び周面板２３を介して取付部２５に伝達されて支持部３０にて支持され、かつその際に上面板２２の両側に上面板２２から周面板２３にわたって連続して形成された凹溝部２４が、上面板２２に加わった上方からの荷重で円滑に変形することによって、上面板２２が下方に弾性的に変位し、着座者を弾性支持して振動吸収性を確保することができる。
特開２００３−１１１６３９号公報 According to such a configuration, when a seated person's load is applied to the upper surface plate 22 via the cushion pad, the load is transmitted to the mounting portion 25 via the upper surface plate 22 and the peripheral surface plate 23 to the support portion 30. In this case, the concave groove portions 24 continuously formed on both sides of the upper surface plate 22 from the upper surface plate 22 to the peripheral surface plate 23 are smoothly deformed by a load from above applied to the upper surface plate 22. The upper surface plate 22 is elastically displaced downward to elastically support the seated person and to ensure vibration absorption.
JP 2003-1111639 A

ところが、上記のように着座した人の荷重で撓みを生じてクッション性を得るようにした樹脂製のシートフレーム２１においては、温度条件が苛酷な地域で長時間連続で使用された場合、樹脂製のシートフレーム２１に永久歪みが残留し、元の形状に復帰しなくなる恐れがあるという問題があった。   However, in the resin-made seat frame 21 which has been bent by the load of the person seated as described above to obtain cushioning properties, when used continuously for a long time in a region where the temperature condition is severe, There is a problem that permanent distortion remains in the seat frame 21 and the original shape may not be restored.

本発明は、上記従来の問題点に鑑み、面一感、連続感のあるクッション性を確保しながら、苛酷な温度条件下でも永久変形を生じる恐れのないシートクッションのフレーム構造を提供することを目的とする。   In view of the above-described conventional problems, the present invention provides a frame structure of a seat cushion that does not cause permanent deformation even under severe temperature conditions while ensuring cushioning with a sense of surface and continuity. Objective.

本発明のシートクッションのフレーム構造は、上面板と周面板を有するとともに上面板と周面板との間にわたって連続する凹溝部を上面板の両側の互いに対向する箇所に少なくとも１対有する樹脂シートフレームと、上面板上に装着されたクッションパッドを備えているシートクッションのフレーム構造であって、前記樹脂シートフレームの凹溝部の配列方向に沿って前記凹溝部の直下でその下面に当接させて配設した金属弾性体を有するものである。 The frame structure of the seat cushion of the present invention, a resin seat frame at least 1 Taiyu the groove portion continuous over between the top plate and the peripheral surface plate opposing positions on either side of the upper plate and having a top plate and a peripheral surface plate When, in a frame structure of a seat cushion and a cushion pad mounted on the top plate, it is brought into contact with the lower surface immediately below the concave groove portion along the arrangement direction of the concave groove portion of the resin sheet frame It has a disposed metal elastic body .

この構成によると、上面板と周面板を有するとともに上面板と周面板との間にわたって連続する複数の凹溝部を有する樹脂シートフレームを用いているので面一感、連続感のあるクッション性を確保することができ、金属弾性体を前記樹脂シートフレームの凹溝部の配列方向に沿って前記凹溝部の直下でその下面に当接させるように配設したので樹脂シートフレームに永久歪みが発生するのを防止することができる。 According to this configuration, a resin sheet frame having an upper surface plate and a peripheral surface plate and having a plurality of concave grooves continuous between the upper surface plate and the peripheral surface plate is used, so that a cushioning feeling with a feeling of continuity and a continuous feeling is ensured. Since the metal elastic body is disposed so as to contact the lower surface of the resin sheet frame along the arrangement direction of the groove portions of the resin sheet frame, the permanent deformation occurs in the resin sheet frame. Can be prevented.

本発明のシートクッションのフレーム構造は、樹脂シートフレームの下部に凹溝部の配列方向に沿って金属製弾性体を配設したので、面一感、連続感のあるクッション性を確保しながら、苛酷な温度条件下でも永久変形を生じる恐れを無くすことができる。   In the frame structure of the seat cushion according to the present invention, the metal elastic body is arranged along the direction of the concave grooves in the lower part of the resin seat frame. It is possible to eliminate the possibility of permanent deformation even under various temperature conditions.

以下、本発明のシートクッションのフレーム構造における一実施形態について、図１〜図３、及び図６を参照して説明する。   Hereinafter, an embodiment of the frame structure of the seat cushion of the present invention will be described with reference to FIGS. 1 to 3 and FIG. 6.

図１において、１は自動車用シートにおけるシートクッションの樹脂シートフレームで、合成樹脂成形品にて構成されている。樹脂シートフレーム１は、着座支持面を構成する上面板２とその周縁から下方に垂下する周面板３とを一体成形して構成されている。また、上面板２の中央部には着座者の尻部を緩やかに受け入れるように後部に向けて徐々に深くなる受入れ凹部２ａが凹入形成されている。   In FIG. 1, reference numeral 1 denotes a resin seat frame of a seat cushion in an automobile seat, which is composed of a synthetic resin molded product. The resin seat frame 1 is formed by integrally molding an upper surface plate 2 that constitutes a seating support surface and a peripheral surface plate 3 that hangs downward from the periphery thereof. In addition, a receiving recess 2a that gradually becomes deeper toward the rear is formed in the central portion of the top plate 2 so as to gently receive the buttocks of the seated person.

上面板２の後部両側の互いに対向する箇所には、上面板２と周面板３との間にわたって連続する凹溝部４が前後方向に適当間隔あけて複数対（図示例では４対）形成されている。各凹溝部４は、樹脂シートフレーム１の面板を凹入成形して構成されており、図３に示すように、その溝底部４ａが上面板２の受入れ凹部２ａの周縁部との交差位置から周面板３の下端の内側近傍に向けてほぼ水平に延び、正面視で上面板２を上面と斜辺、周面板３を側辺、溝底部４ａを底辺とする略台形状となるように形成されている。   A plurality of pairs (four pairs in the illustrated example) of recessed groove portions 4 that are continuous between the upper surface plate 2 and the peripheral surface plate 3 are formed at appropriate positions in the front-rear direction at opposite positions on both sides of the rear portion of the upper surface plate 2. Yes. Each groove 4 is formed by recessing the face plate of the resin sheet frame 1, and as shown in FIG. 3, the groove bottom 4 a is located from the intersection with the peripheral edge of the receiving recess 2 a of the top plate 2. It extends substantially horizontally toward the inside of the lower end of the peripheral surface plate 3 and is formed to have a substantially trapezoidal shape with the upper surface plate 2 as an upper surface and an oblique side, the peripheral surface plate 3 as a side, and the groove bottom portion 4a as a base in a front view. ing.

樹脂シートフレーム１の前部両側隅部近傍と後部両側隅部近傍にはそれぞれ、図２に詳細に示すように、下方に向かって径が小さくなる有底中空円錐状の取付部５が上面板２から凹入成形され、その底部にナット部材６がインサート成形にて一体的に固着されている。また、樹脂シートフレーム１の下面には、左右両側における前後の取付部５、５間にわたって、金属製弾性体として板ばね材７が配設されている。図示例では、この板ばね材７の両端部にナット部材６を固定して樹脂シートフレーム１と一体にしているが、樹脂シートフレーム１と板ばね材７は別体とし、樹脂シートフレーム１の取付部５を、図６に示すように、シートレール装置２７ａ、２７ｂの支持部３０上に載せてボルト３１にて締結固定する際に、支持部３０と固定部５との間に板ばね材７を介装して共締めして設置しても良い。   As shown in detail in FIG. 2, a bottomed hollow conical mounting portion 5 whose diameter decreases downward is provided on the top plate near the front side corners and the rear side corners of the resin seat frame 1, respectively. Indented from 2, the nut member 6 is integrally fixed to the bottom thereof by insert molding. Further, on the lower surface of the resin sheet frame 1, a leaf spring material 7 is disposed as a metal elastic body across the front and rear mounting portions 5, 5 on both the left and right sides. In the illustrated example, nut members 6 are fixed to both ends of the leaf spring material 7 to be integrated with the resin seat frame 1. However, the resin seat frame 1 and the leaf spring material 7 are separated from each other. As shown in FIG. 6, when the mounting portion 5 is placed on the support portion 30 of the seat rail devices 27 a and 27 b and fastened and fixed by the bolt 31, the leaf spring material is interposed between the support portion 30 and the fixing portion 5. 7 may be installed together.

板ばね材７は、上記のように前後の取付部５、５間にわたって配設されていることにより、凹溝部４の配列方向に沿って配設されるとともに、これらの凹溝部４の直下でその下面に当接して配設されている。また、板ばね材７の共振周波数領域は樹脂シートフレーム１の共振周波数領域と異ならせている。   The leaf spring material 7 is disposed along the arrangement direction of the recessed groove portions 4 by being disposed between the front and rear mounting portions 5 and 5 as described above, and immediately below these recessed groove portions 4. It is disposed in contact with the lower surface. Further, the resonance frequency region of the leaf spring material 7 is different from the resonance frequency region of the resin sheet frame 1.

また、樹脂シートフレーム１の上部に、図３に仮想線で示すように、発泡合成樹脂から成るクッションパッド８を装着し、さらのその外面をシートクッションカバー９で覆うことによってシートクッション１０が構成される。   Further, as shown by phantom lines in FIG. 3, a cushion pad 8 made of foamed synthetic resin is mounted on the upper part of the resin seat frame 1, and the outer surface thereof is covered with a seat cushion cover 9 to constitute a seat cushion 10. Is done.

このような構成によると、シートクッション１０に着座した着座者の荷重がクッションパッド８を介して樹脂シートフレーム１の上面板２上に加わると、その荷重は上面板２と周面板３を介して四隅近傍の取付部５に伝達され、図６に示す支持部３０を介してシートレール装置２７ａ、２７ｂにて支持される。   According to such a configuration, when a load of a seated person sitting on the seat cushion 10 is applied to the upper surface plate 2 of the resin seat frame 1 via the cushion pad 8, the load is transmitted via the upper surface plate 2 and the peripheral surface plate 3. It is transmitted to the mounting portions 5 in the vicinity of the four corners and supported by the seat rail devices 27a and 27b via the support portions 30 shown in FIG.

その際に、樹脂シートフレーム１の両側部の対向する箇所に、上面板２から周面板３に連続する凹溝部４が複数設けられているので、上面板２に加わった上方からの荷重によってこれら凹溝部４が容易に弾性変形することによって、上面板２及び周面板３が弾性的に下方に撓んで上面板２が下方に弾性変位する。かくして、厚さの小さいクッションパッド８と組み合わせてコンパクトな構成にしても、十分なクッション性を持ちかつ面一感及び連続感のあるシートクッション１０が得られる。   At that time, since a plurality of concave groove portions 4 continuing from the upper surface plate 2 to the peripheral surface plate 3 are provided at opposite positions on both side portions of the resin sheet frame 1, these are caused by an upward load applied to the upper surface plate 2. When the groove portion 4 is easily elastically deformed, the upper surface plate 2 and the peripheral surface plate 3 are elastically bent downward, and the upper surface plate 2 is elastically displaced downward. Thus, even when the cushion pad 8 having a small thickness is combined with a compact structure, the seat cushion 10 having a sufficient cushioning property, a smooth feeling and a continuous feeling can be obtained.

また、各凹溝部４において面板が連続しているので、繰り返し荷重が作用しても切欠部への応力集中による永久変形や亀裂が発生する恐れが少なく、強度上の問題も解消することができ、樹脂シートフレーム１に亀裂等を生じる恐れなく、より大きな撓み量を得ることができる。   In addition, since the face plate is continuous in each concave groove portion 4, there is little possibility of permanent deformation or cracking due to stress concentration on the notch portion even when a repeated load is applied, and the strength problem can be solved. A greater amount of bending can be obtained without fear of causing cracks or the like in the resin sheet frame 1.

さらに、この樹脂シートフレーム１の両側部おいて、凹溝部４の配設部の下面が板ばね材７にて支持されているので、温度条件の苛酷な地域で長時間連続で使用された場合でも、金属製の板ばね材７は永久変形を起こさず、復元性があるため、樹脂シートパネル１の永久変形を効果的に防止することができる。   Furthermore, since the lower surface of the arrangement part of the concave groove part 4 is supported by the leaf spring material 7 on both sides of the resin sheet frame 1, the resin sheet frame 1 is used continuously for a long time in an area where the temperature condition is severe. However, since the metal leaf spring material 7 does not cause permanent deformation and has recoverability, permanent deformation of the resin sheet panel 1 can be effectively prevented.

また、樹脂シートフレーム１の弾性特性と、板ばね材７の弾性特性と、クッションバッド８の弾性及びダンパ特性が組み合わされることによって、高い振動吸収性能が発揮され、着座者の座り心地を向上することができる。特に、樹脂シートフレーム１と板ばね材７の共振周波数領域を異ならせているので、広い周波数帯域での振動吸収性能向上を図ることができる。   Further, by combining the elastic characteristics of the resin seat frame 1, the elastic characteristics of the leaf spring material 7, and the elasticity and damper characteristics of the cushion pad 8, high vibration absorbing performance is exhibited and the seating comfort of the seated person is improved. be able to. In particular, since the resonance frequency regions of the resin sheet frame 1 and the leaf spring material 7 are different, it is possible to improve the vibration absorption performance in a wide frequency band.

また、例えば乱暴にシート上に乗り込んだ時や、前面衝突時に乗員が慣性力によって沈み込みながら前方移動することにより発生するサブマリン荷重が作用した時など、過度の荷重が樹脂シートフレーム１に作用した場合にも、板ばね材７にて支持されることで、樹脂シートフレーム１が限界を越えて大きく撓むのを防止でき、樹脂シートフレーム１に亀裂や破損が発生する恐れを防止できる。   In addition, excessive load is applied to the resin seat frame 1 when, for example, the board rides on the seat wildly or when a submarine load is generated when the occupant moves forward while sinking due to inertial force during a frontal collision. Even in this case, by being supported by the leaf spring material 7, it is possible to prevent the resin sheet frame 1 from greatly bending beyond the limit, and to prevent the resin sheet frame 1 from being cracked or damaged.

以上の実施形態の説明では、金属製弾性体として樹脂シートフレーム１の前後の取付部５、５間にわたって凹溝部４の下面に当接するように板ばね材７を配設した例を示したが、Ｓばねであってもよい。また、図４に示すように、樹脂シートフレーム１の前端部と後端部の両側部に、それぞればね掛け部１１をインサート成形等にて一体的に設け、前後のばね掛け部１１、１１間に金属製弾性体としてのＳばね１２を架設し、これらＳばね１２を上面板２の受入れ凹部２ａの両側部下面や凹溝部４の配設部下面に当接させてこれらを弾性的に支持するように構成しても良い。このように構成しても、上記と同様の作用効果を奏することができる。   In the above description of the embodiment, an example in which the leaf spring material 7 is disposed so as to contact the lower surface of the recessed groove portion 4 across the mounting portions 5 and 5 of the resin sheet frame 1 as a metal elastic body is shown. , S spring may be used. Further, as shown in FIG. 4, spring hook portions 11 are integrally provided on both sides of the front end portion and the rear end portion of the resin sheet frame 1 by insert molding or the like, and between the front and rear spring hook portions 11, 11. An S spring 12 as a metal elastic body is installed on the base plate, and these S springs 12 are brought into contact with the lower surface of both side portions of the receiving recess 2a of the upper surface plate 2 and the lower surface of the arrangement portion of the groove portion 4 to elastically support them. You may comprise so that it may do. Even if comprised in this way, there can exist an effect similar to the above.

本発明のシートクッションのフレーム構造によれば、両側に複数の凹溝部を有する樹脂シートフレームの下部に凹溝部の配列方向に沿って金属製弾性体を配設し、樹脂シートフレームにて面一感、連続感のあるクッション性を確保しながら、苛酷な温度条件下でも永久変形を生じる恐れを無くすようにしたので、車室内が高温に晒されることがある自動車用シートなどに特に有用である。   According to the frame structure of the seat cushion of the present invention, the metal elastic body is disposed along the arrangement direction of the concave groove portions at the lower part of the resin seat frame having a plurality of concave groove portions on both sides, and is flush with the resin seat frame. It is particularly useful for automobile seats where the interior of the vehicle may be exposed to high temperatures because it eliminates the possibility of permanent deformation even under severe temperature conditions while ensuring cushioning with a feeling of continuity. .

本発明のシートクッションのフレーム構造の一実施形態の平面図である。It is a top view of one embodiment of the frame structure of the seat cushion of the present invention. 図１のＡ−Ａ矢視断面図である。It is AA arrow sectional drawing of FIG. 図１のＢ−Ｂ矢視断面図である。It is BB arrow sectional drawing of FIG. 本発明のシートクッションのフレーム構造の他の実施形態の平面図である。It is a top view of other embodiments of the frame structure of the seat cushion of the present invention. 従来例のシートフレームの斜視図である。It is a perspective view of the seat frame of a prior art example. シートフレームの取付構造を示す分解斜視図である。It is a disassembled perspective view which shows the attachment structure of a seat frame.

符号の説明Explanation of symbols

１ 樹脂シートフレーム
２ 上面板
３ 周面板
４ 凹溝部
７ 板ばね材（金属製弾性体）
１０ シートクッション
１２ Ｓばね（金属製弾性体） DESCRIPTION OF SYMBOLS 1 Resin sheet frame 2 Upper surface board 3 Peripheral surface board 4 Concave groove part 7 Leaf spring material (metallic elastic body)
10 Seat cushion 12 S spring (metal elastic body)

Claims (1)

上面板と周面板を有するとともに上面板と周面板との間にわたって連続する凹溝部を上面板の両側の互いに対向する箇所に少なくとも１対有する樹脂シートフレームと、上面板上に装着されたクッションパッドを備えているシートクッションのフレーム構造であって、前記樹脂シートフレームの凹溝部の配列方向に沿って前記凹溝部の直下でその下面に当接させて配設した金属弾性体を有することを特徴とするシートクッションのフレーム構造。 A resin seat frame at least 1 Taiyu the groove portion continuous over between the top plate and the peripheral surface plate and having a top plate and a peripheral surface plate opposing positions on either side of the upper plate, a cushion mounted on the top plate a frame structure of a seat cushion and a pad that has a metal elastic body thereof underside is in contact be disposed right under the concave groove portion along the arrangement direction of the concave groove portion of the resin sheet frame The frame structure of the characteristic seat cushion.
JP2004074108A 2004-03-16 2004-03-16 Seat cushion frame structure Expired - Fee Related JP4514483B2 (en)

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Application Number Priority Date Filing Date Title
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JP2005261468A JP2005261468A (en) 2005-09-29
JP4514483B2 true JP4514483B2 (en) 2010-07-28

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD782849S1 (en) 2015-12-28 2017-04-04 Kraco Enterprises, Llc. Seat cushion
JP7222735B2 (en) * 2019-02-01 2023-02-15 テイ・エス テック株式会社 vehicle seat

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0534955U (en) * 1991-05-02 1993-05-14 東芝ケミカル株式会社 Plastic chair
JPH09285356A (en) * 1996-04-25 1997-11-04 Ikeda Bussan Co Ltd Pan-type sheet frame
JP2003111639A (en) * 2001-07-30 2003-04-15 Daihatsu Motor Co Ltd Resin frame for seat cushion

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0534955U (en) * 1991-05-02 1993-05-14 東芝ケミカル株式会社 Plastic chair
JPH09285356A (en) * 1996-04-25 1997-11-04 Ikeda Bussan Co Ltd Pan-type sheet frame
JP2003111639A (en) * 2001-07-30 2003-04-15 Daihatsu Motor Co Ltd Resin frame for seat cushion

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