| 摘要 |
The lifting platform has at least two lifting surfaces (1,2)adjustable in height each by a hydraulic hoist. Each hoist has a lifting piston (5,6) movable inside a cylinder (3,4) by means of a movement-transfer appliance and connected to its lifting surface. Each of the two lifting pistons is operated by an operating piston (7,8) belonging to a pump (9) by means of a movement transmission medium in an enclosed circuit (10,11). The two pistons are rigidly joined so as to move together. The pump has two pump cylinders (12,13) in which a pressurized medium acts upon the pistons |
