| 摘要 |
1. A jack for a motor vehicle, of the type comprising a pillar (1) on which is pivotally mounted an arm (2) whose angular position relative to the pillar is adjustable, in particular by means of a shifting screw (4) carried by two members (5, 6) respectively pivotally mounted on the arm and on the upper part of the pillar, characterised in that it comprises, on the side of the pillar opposed to the arm, a prop (11) which is mounted on the pillar to pivot about a pivot pin (12) parallel to the pivot pin of the arm and located below the latter, and which is extended toward the arm by a lever (13) which is maintained in bearing relation to a lower surface (15) of the arm by a spring (14), the free end (20) of the prop defining with the foot (7) of the jack, when they are simultaneously in contact with a substantially horizontal ground, a support surface which is such that the head (9) and the foot (7) of the jack are always in the vicinity of a common vertical (V). |
