| 摘要 |
A hand crank for actuating a gear assembly mechanism such as for a lifting jack is described. The hand crank comprises an elongated metal primary handle, a tube bent at very precise angles to define two spaced-apart handle portions, separated from one another in parallel planes, by a central portion. A connector includes a bracket that has a V-shaped slot to secure the hand crank to a gear actuator at two alternate working positions and a storage position. When in the first position, the handles of the hand crank are parallel to a longitudinal axis of the actuator and define a high-speed position. When in the second position, the two handle portions are parallel to the longitudinal axis of the actuator. The handle portions are spaced about 8.5 inches from one another and about the same distance apart to constitute an ergonomic disposition when used at their first position. In the second position, the central portion lies at an angle when used at their first position slightly less than 90.degree. from the horizontal axis to maintain the connector rigidly secured and the outer handle portion acts as the cranking lever.
|
