| 摘要 |
<p>The present invention relates to a hydraulic actuating cylinder (11) with no driving piston comprising an elastically deformable closed envelope (14) connected firstly to a mobile actuating rod (16) and secondly to a fixed point, said envelope (14) is designed to adopt a first position when the pressures between the inside and the outside of the envelope (14) are approximately equal, said envelope (14) is able to contract into a second position when the pressure outside the envelope (14) is higher than a threshold value, said actuating cylinder (11) further comprising means for increasing the pressure inside the envelope (14) that allow the envelope (14) to pass from the second position into the first position.</p> |
