| 摘要 |
<p>It is described a variable strength spring 1 including a tubolar body 2, to which inner is coaxially obtained a concave contrast seat 4, a ring 7 made of elastomeric material, rigidly engaged in the tubolar body and a connection tang 14 rigidly engaged in the elastic ring. The elastic ring presents a radial groove 8 that defines, on the longitudinal length of same ring, a first portion 7a rigidly engaged inside the tubolar body, in the opposite side of the contrast seat, and a second portion 7b slidely engaged in the tubolar body. On the outer circumferential length of the second portion is situated a rabbet edge 12 which results opposite to a stopping seat 6 obtained inside the tubolar body 2.</p> |
