| 摘要 |
For adjusting the height and inclination of the sitting portion of a seat with respect to the base of this seat, two mechanisms are provided placed respectively between these two sub-assemblies, at the front and at the rear of the seat. Each mechanism comprises, on each side of the seat, two horizontal bearing surfaces integral with the base, a horizontal shaft connected vertically to the sitting portion and pivotably mounted thereon, two flat Archimedes-spiral cams in opposite directions integral with the shaft and placed jointingly between the bearing surfaces, and electric means for causing said shaft to rotate, these means allowing the shaft of the front mechanism, that of the rear mechanism or both at the same time to be rotated at will.
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