| 摘要 |
<p>The equipment has a lower frame (1) including an inner space for receiving a lifting platform (7). A rising or lowering mechanism permits rising or lowering of the platform. The mechanism includes an endless chain (16) arranged horizontally in an upper part of an upper frame (3) by guiding and returning by rollers (17) fixed on supports from transversal rails of the upper frame. The rollers allow fixation of threaded rods (14). One of the rollers and a motor are controlled by a crank (18). A tensioning element arranged on one of the rails allows adjustment of tension of the chain.</p> |
