| 摘要 |
<p>The lifting stage has a platform, which may be raised and inclined by a single scissor jack consisting of two pairs of scissor arms. The scissor axis to adjust the inclination of the platform, may be moved to a point outside the crossing point of the scissor arms, and fixed in this position. Displacement of the axis takes place along an arc of a circle, the centre of which is in a hinge point of a scissor arm in the floor or on the platform. The arc is defined by guide element with a similarly shaped longitudinal slot, through which the axis passes. The element is fastened to the outer or inner arm of each pair.</p> |
