| 摘要 |
A vertically movable platform (1) having between the platform and the base (2) at least one shearlegs member (3,4) by the aid of which the platform maintains unchanged orientation regardless of vertical motions, and where the vertical movements of the platform have been accomplished by the aid of a screw (5) connected to the shearlegs member. The screw (5) is connected with the shearlegs member (3,4) by means of transmission members (6,7) by the aid of which the movement of the platform is constantly nearly linear in relation to the rotation of the screw. <IMAGE> |
