| 摘要 |
<p>Pneumatic spring comprising a hollow casing (1) having two opposite bases, in which a first one of these bases is closed by a first appropriate wall (11) and the other base is closed by a second wall (12) provided with a central opening (13). A piston (2) slides within said hollow casing and delimits a chamber (14) facing the first base, and is adapted to act upon the gas contained in the chamber, A stem (3) is connected to a central portion of the piston and passes through said central opening so as to have a portion thereof that protrudes externally from the casing. There are provided means adapted to ensure the tightness of the seal of at least a portion of the inner volume of said chamber (14) towards the outside, which comprise elastic corrugations. These corrugations have hermetically sealed edges so that the gas contained therein, and contained also in a part of said chamber, can be compressed without any leakage. <IMAGE></p> |
