| 摘要 |
<p>In a vehicle lifting jack comprising a supporting leg (10) and a carrier arm (23) mounted pivotally on the leg for movement about a fixed horizontal axis, a threaded spindle (17) is adjustable in a spindle nut (18) which is of plastics material and which is mounted hingedly on the leg or on the arm. In order to improve the stability and safety of the jack and the load- bearing capacity of its plastics spindle nut, the thread flank width of the thread (30) of the spindle is made less than the thread flank width of the thread (29) of the plastics nut. <IMAGE></p> |
