| US 7,600,821 B2 | ||
| Seat | ||
| Eiichi Yasuda, Aichi-gun (Japan); Shunichi Doi, Aichi-gun (Japan); Kazukata Takei, Aichi-gun (Japan); Etsunori Fujita, Hiroshima (Japan); Yumi Ogura, Hiroshima (Japan); and Seiji Kawasaki, Hiroshima (Japan) | ||
| Assigned to Delta Tooling Co., Ltd., Hiroshima-shi (Japan) | ||
| Filed on Jul. 03, 2002, as Appl. No. 10/187,990. | ||
| Claims priority of application No. 2001-204091 (JP), filed on Jul. 04, 2001; and application No. 2002-190178 (JP), filed on Jun. 28, 2002. | ||
| Prior Publication US 2003/0006640 A1, Jan. 09, 2003 | ||
| Int. Cl. A47C 7/02 (2006.01) | ||
| U.S. Cl. 297—452.29 [297/452.56] | 25 Claims |
| 1. A seat comprising:
a seat cushion; and
a seat back including a seat back frame mounted on the seat cushion a backrest mounted on the seat back frame, and a flexible
portion formed on the backrest,
wherein the backrest is substantially net-shaped, and the backrest is provided in a tensioned state on the seat back frame,
such that a horizontal tension in the backrest is minimized at a portion corresponding to a horizontal line set through upper
rear iliac spines of a seated position of the user and increased gradually from a portion of the minimized tension, or such
that a horizontal looseness is maximized at the portion corresponding to a horizontal line set through the upper rear iliac
spines of the seated position and decreased gradually from a portion of the maximized looseness,
wherein when a user is sitting on the seat, individual centers of a load situated at a plurality of regions, the regions presumed
on left and right sides of a backrest surface symmetrically about a vertical central line of the seat back, are distributed
outside a backrest area corresponding to a back region of the user, the backrest area defined by a straight line joining lower
ends of left and right blade bones of the user, by a straight line joining upper ends of left and right iliac bones and by
straight lines set above and along right and left lumbar iliocostal muscles.
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