| 摘要 |
<p>A hoist system employing a hydraulic motor, a variable displacement reversible flow hydraulic pump for supplying hydraulic fluid to the hydraulic motor, and an electric motor employed as a prime mover for the pump has a manually operable control arrangement which can be actuated in either of two directions for thereby determining both the displacement of the pump and the direction of flow of such displacement. Within the overall control arrangement, lost motion connecting means are provided whereby upon initiation of movement of the control assembly by the operator, associated electrical circuit means is closed to thereby energize the electric motor, sequentially prior to the actuation of the pump for determining the direction and displacement of flow therefrom, to pressurize the pump assembly.</p> |
