| 摘要 |
<p>Hydraulic jack (1), with a main body (12) and an articulated lifting arm (2), provided with safety mechanisms so that the jack load does not fall in the event of hydraulic failure. The jack comprises a lever member (5) that turns in relation to the main body (12), operated by a spring (13) in a locking direction (B) and operable in an unlocking direction (A) by means of an operable area (7). The lever member (5) comprises a first curved area (10) and a second curved area (11) separated by a step (8). The lifting arm (2) comprises a rotating stop member (9) capable of rolling along the first curved area (10) or the second curved area (11) when the lifting arm (2) rotates, and which lodges itself in the step (8) in order to lock the lifting arm (2) and prevent it from rotating in a descending direction.</p> |
