| 摘要 |
A hydraulic lift for automotive vehicles having a plurality of tubular elements which communicate with each other with telescopic cooperation comprising a plurality of axially aligned cylinders, each of which is rigidly connected with a disc-shape transverse plate arranged at its upper base and provided with an elastic packing disposed thereon and having a peripheral edge which constitutes a friction ring with respect to the inner walls of each immediately preceding cylinder, the cylinders forming chambers of variable volume in a number of one per cylinder which communicate with one another through respective central conduits, and a helical tension spring passing through the conduits and extending from the upper cover of the uppermost cylinder to the lower end of the bottom cylinder.
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