| 摘要 |
<p>The scissor mechanism comprises two or more X-shaped scissor units one above the other, and extended and retracted on a chassis by a drive mechanism. The legs of the scissor unit (6) between the chassis (1) and the unit above (7) are each in secitons (8,9) telescoping freely in the lengthwise direction, and hinge on the chassis. There can be a support (20) extending above the lowermost scissor hinge (12) and equipped a drive mechanism (16,19,21) travelling up and down. This engages with the scissor unit near the hinge.</p> |
