| 摘要 |
PCT No. PCT/EP95/00618 Sec. 371 Date Oct. 17, 1996 Sec. 102(e) Date Oct. 17, 1996 PCT Filed Feb. 21, 1995 PCT Pub. No. WO95/22270 PCT Pub. Date Aug. 24, 1995A back rest for a seat wherein the back rest includes a support member having first and second edge surfaces, a central plate between the edge surfaces, a first side member coupling the central plate to the first edge surface, and a second side member coupling the central plate to the second edge surface. The central plate of the support member is recessed from the first and second end surfaces to define a cavity. The back rest further includes a plurality of protrusions extending from the central plate and into the cavity. Additionally, the back rest includes a lordosis support having first and second ends coupled to the plurality of protrusions, at least one of the first and second lordosis support ends being coupled to the plurality of protrusions for movement relative to the support member. The lordosis support is adapted to bow upon displacement of one of the first end and the second end thereof toward one another thereby forming a curvature. In another embodiment a back rest includes a support member defining an opening and a separately formed bulge member defining side surfaces and a central plate recessed from and integral with the side surfaces to define a cavity. The back rest according to this embodiment also includes connectors for coupling the bulge member to the support member.
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