| 摘要 |
PURPOSE:To make an output variable and to miniaturize an electric motor for driving a hydraulic pump by making release of connection possible between an output shaft of a small output cylinder having a long stroke length and an output shaft of a large output cylinder having a short stroke length. CONSTITUTION:When hydraulic oil from a hydraulic pump 15 is sent to an output side by changing-over a directional control valve 16, a piston 2, an output shaft 3, a metal connector 4 and a connecting rod 5 are made to rise, solenoid valves 16 and 17 are changed over through a signal to be obtained by a hit of the metal connector 4 against a limit switch 12, and an output shaft 8 is made to rise by sending the hydraulic oil of the hydraulic pump to the output shaft side of a large output cylinder 6. Then a hook 9 is closed for connection between the output shaft 8 and the connecting rod 5. And then the hydraulic oil is sent to the output shaft side of the small output cylinder 1 by changing over the directional control valve 6, and an article is lifted by an action of both cylinders. Therefore, miniaturization of an electric motor for driving a hydraulic pump becomes possible as it is enough to set an output of the hydraulic pump to the smallest force required for a movement of the article. |
