| 摘要 |
Pivotable adjustment mechanism is provided for the connection of two mutually moveable members. Such members can be a seat portion and a base support portion of a chair, two cooperating, shaft forming members of an apparatus, a machine, etc. The adjustment mechanism includes two concentric rings suspended according to the cardan principle. The two rings each have a torsion bar disposed along a diameter of and securely fastened to its ring for adjustment of the latter, the two torsion bars being arranged at right angles to each other. A first member is fastened to the outer ring which is suspended by rotatably mounting the ends of its torsion bar in brackets secured to the inner ring which is axially displaced of the outer ring. The inner ring is suspended by rotatably mounting the ends of its torsion bar in a bracket secured to a second member of the chair, apparatus, machine, etc. The torsion bars of the outer ring are secured at their centers against rotation relative to the inner ring and the bracket secured to said second member respectively. This provides a more robust construction with the use of torsion springs which provides a longer lifetime for the springs and less noise in the springs during use. |
