| 摘要 |
Combination oil/gas spring comprising a first hollow casing, a piston capable of fluid-tightly sliding within said casing, a rod connected rigidly with an end portion thereof to a central portion of said piston, a first chamber containing an actuating rod provided inside said casing, a second sealed chamber provided within the same casing on the opposite side of the piston, a mass of hydraulic fluid filling said second sealed chamber, a second hollow casing and a respective second piston provided to slide therewithin, a first conduit connecting the interior of said second sealed chamber with the interior of said second hollow casing, a first valve connected to said first conduit and adapted to selectively open and close it, a second conduit being provided to connect an expansion vessel to the first conduit at a position upstream of the first valve, and a second valve being provided on the second conduit. There are provided pressure-exerting means adapted to act by exerting a controllable pressure upon the surface of the liquid in the expansion vessel.
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