| 摘要 |
<p>A device for adjusting the elastic force exerted by a plurality of springs, wherein there are provided main springs (20) and auxiliary springs (30) connected to two mutually movable structures (10,41). There are provided means for operatively coupling or uncoupling the connection of the free end of one or more of the auxiliary springs (30) with respect to at least one of the structures (10,41).</p> |
