| 摘要 |
A dual lift for large loads such as vehicles has two lifting units set in opposition to each other to straddle the load. Each of the lifting unit has a vertical standard, cantilevered arms mounted on the standard for movement therealong, and a hydraulic actuator for raising and lowering said arm. A source of fluid under pressure such as a motor, pump, and reservoir provides fluid under pressure, transferred first to one of the actuators, and from this first actuator between it and the other in a reversible series. The first actuator functions as a master and the other actuator as a slave thereto so that actuation of the slave is synchronized directly with the operation of said master.
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