| 摘要 |
PCT No. PCT/CA94/00428 Sec. 371 Date Jan. 22, 1996 Sec. 102(e) Date Jan. 22, 1996 PCT Filed Aug. 5, 1994 PCT Pub. No. WO95/04488 PCT Pub. Date Feb. 16, 1995An adjustable backrest for supporting a human back comprising a straight spine member; a lumbar support member projecting from the straight spine member; an upper back support member projecting from the straight spine member adjacent the lumbar support member; a back pad resting on the lumbar support member and the upper back support member for supporting the human back. Structure is provided for adjusting curvature of the lumber support member and for adjusting curvature of the upper back support member to accommodate different shapes of the human back, as well as for providing side-to-side mobility of the back pad to accommodate twisting movement of the human back.
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