Delta Tooling Co., Ltd.

Kabushiki Kaisha Toyota Chuo Kenkyusho

Shun'ichi Doi

Etsunori Fujita

Yumi Ogura

Seiji Kawasaki

Kazuyoshi Chizuka

Eiichi Yasuda

Yasuhide Takata

Kiyokazu Sunami

Kazukata Takei

At a vehicle seat, a cushion materialis provided at a framefor a sitting portion of a seat frame, such that a seat cushionis formed. An upper cushion member (three-dimensional solid knit fabric), which is a surface layer portion of the cushion material, is stretched at the framefor the sitting portion, and is layered on a cloth spring materialwhich is a lower layer portion of the cushion material. When the cloth spring materialis pressed and flexes downward due to pushing-against force which is based on body weight of a seated person at a time of sitting on the seat cushion, at regions of the cloth spring materialwhich are pushed by ischial tuberosities of the seated person, tensile forces of extension coil springs, which are forces in the pushing direction, act, and directions of tension of the cushion materialare in three dimensions.

Seat

This present invention discloses a seat, comprising: a seat cushion; and a seat back frame connected to the seat cushion, the seat back frames being bent in a range of specified bending angle in a direction of moving the top end backward by a backward load over a predetermined value, by way of a joint provided at an intermediate portion in the vertical direction, such that the seat back frame receives a reaction force corresponding to the bending angle.

A seat structure includes a torsion bardisposed along the width direction in the vicinity of the bottom end of a back frame, a pelvis supporting plateis connected to the torsion bar, and a flat-type supporting memberfor the seat back is engaged with the vicinity of the bottom end of the pelvis supporting plateand strained. Slack of the flat-type supporting membercan be eliminated by the pelvis supporting plateto enhance the appearance. Further, a vibration inputted from the seat back side, and vibrates as if patting on the back of the human body can be absorbed by an elastic force of the torsion bar

Seat structure

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Takamatsu, Japan

Shun'ichi Doi