摘要 |
<p>The device has an actuation mechanism (13) including two loops of chains (17a, 17b), where each loop is stretched over a group of pulleys (18a, 18b). A mobile support (12) is suspended with the chains. A guidance unit (14) comprises two parallel circuits (14a, 14b), where each circuit includes a loop of guide rails (15) and guide elements (16) integral of the support. The loop of guide rails is arranged to guide the guide elements of the mobile support and to maintain the support in a stable position during its displacement.</p> |