| 摘要 |
The back 12h has an ergonomic shape, having a transverse bulge 13 for lumbar support over approximately 1/3 of its height starting from the base, and also an axial bulge 14 for supporting the spinal column, enclosed by two symmetrical lateral hollows 15 for the shoulders over approximately the upper 1/3 of its height, the back being inclined approximately 10 DEG rearwards and being connected to a toilet seat flap 4h raised approximately 10 DEG towards the front relative to the horizontal upper plane of the toilet. <IMAGE>
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