| 摘要 |
An adjustable sitting device, e.g. a chair with the mutual angle between the seat and the back rest being adjustable, if desired, with simultaneous adjustment of the level of the seat and the back rest, said seat and/or back rest being turnable about an axis that is essentially coincident with an imaginary axis through the hip joints of the user. The lower portion of the back rest has a circle sector shaped cross section and the rear portion of said seat has a correcponding circle sector shaped cross section with a circle sector shaped mounting plate inserted between said portions for a sliding support of said back seat and seat portions.
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