| 摘要 |
PCT No. PCT/NO90/00134 Sec. 371 Date Feb. 8, 1993 Sec. 102(e) Date Feb. 8, 1993 PCT Filed Aug. 20, 1990 PCT Pub. No. WO92/03072 PCT Pub. Date Mar. 5, 1992.A straight type torsion spring is clamped together at two ends, the ends being rotatable in relation to each other against the torsion spring force. The torsion spring includes at least four identical torsion rods abutting laterally along their entire extension, thereby utilizing the relatively large twisting angle of the small dimension torsion rods combined with the total torsion force of the torsion spring rods, each of which is independently twisted helically when activating the spring. An adjustable mounting for a chair uses a torsion rod of this type, a seat frame, a back frame, a mounting bracket, and a tilting lever. One end of the torsion spring is secured to the mounting bracket, an upper end of the tilting lever is pivotally connected to a front portion of the seat frame and a rear portion of the seat frame is pivotally connected to the back frame. A forward end of the back frame is pivotally and adjustably connected to the mounting bracket and the mounting bracket is secured to a second end of the torsion spring such that the connection of the back frame to the mounting bracket thereby enables adjustment of the angle of the back frame.
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