摘要 |
<p>The device has a frame, and a case with a guiding chamber (1) opening at its upper part and having a length greater than its width. The chamber is equipped with two lateral flanges whose edges are folded back to define two sliders having U-shaped section cooperating with guide rails. A push rod has a support plate forming geometric base corresponding to section of chamber, where the rod encases itself in the chamber.</p> |