| 摘要 |
PCT No. PCT/JP80/00134 Sec. 371 Date Apr. 9, 1981 Sec. 102(e) Date Apr. 9, 1981 PCT Filed Jun. 17, 1980 PCT Pub. No. WO81/00744 PCT Pub. Date Mar. 19, 1981.This invention relates to a balancer (8) for movably supporting an operating machine above an operating table. The balancer (8) comprises a link mechanism, a bracket (15) supported at the front end of the link mechanism for holding the operating machine, and a spring for loading the front end of the link mechanism or the bracket (15) with balancing force by means of an arm (23) and a pulling member; and a position of the action point on the arm (23) of the elastic force of the spring (48) is shifted by turning a handle (40). |
