| 摘要 |
<p>PCT No. PCT/EP87/00413 Sec. 371 Date Jan. 27, 1989 Sec. 102(e) Date Jan. 27, 1989 PCT Filed Jul. 29, 1987 PCT Pub. No. WO88/00997 PCT Pub. Date Feb. 11, 1988.A cavity floor that includes a profiled sheet material. The sheet material has support feet that are substantially rigid. The surface of the sheet material extending between the support feet is substantially flexible. The thickness of the sheet material and the mutual spacing of the support feet are selected so that the sheet material is sufficiently rigid to support a person and sufficiently flexible to adapt to an uneven floor surface. The deformable surface enables automatic vertical adjustment of the support feet relative to one another when under load.</p> |
