| 摘要 |
The present invention relates to a hydraulic circuit (20) capable of independently controlling a plurality of hydraulic cylinders or actuators (22, 24). The hydraulic circuit (20) includes a set of independently energizeable valves (42, 44, 46) fluidically positioned in the circuit (20) and capable of, when selectively energized and de-energized, functionally isolating specific circuit elements. In one preferred embodiment, the present invention relates to a hydraulic circuit (20) for independently controlling the stowage functions, vertical movement, and rollstop operations of a wheelchair-lifting platform (52). Another preferred embodiment of the present invention relates to a wheelchair lifting platform (52) having a lifting cylinder (22) and a rollstop cylinder (24) and incorporating a hydraulic circuit (20) capable of independently actuating and controlling the respective cylinders (22, 24). |
