| 摘要 |
<p>Hydraulic jack (1), with a main body (12) and an articulated elevator arm (2), provided with safety mechanisms so that the load on the jack does not fall in the event of a hydraulic failure. The jack comprises a lever element (5) that rocks with respect to the main body (12), actuated by a spring (13) in a blocking direction (A) and capable of being actuated in an unblocking direction (B) by means of an actuable zone (7). The lever element (5) comprises a first curved zone (10) and a second curved zone (11) that are separated by a step (8). The elevator arm (2) comprises a rotary stop (9) designed to roll along the first curved zone (10) or the second curved zone (11) when the elevator arm (2) turns and designed to lock on the step (8) in order to block the elevator arm (2) and prevent turning thereof in a downward direction.</p> |
