| 摘要 |
<p>A shear-type vehicle jack has an arm articulated to a leg whose foot is provided with a rolling formation adapted to rest upon the ground and a larger locating portion. A crank rotates a thread spindle in a nut pivotally received in the upper end of the leg and engaging the arm with a bearing arrangement. The free end of the arm has carrying formations adapted to engage the vehicle chassis in a manner free from bending moments.</p> |
