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US 4,909,488 AGranted
Gas spring having a plurality of pressure chambers arranged one behind another
AssigneeStabilus GmbH
InventorsKarl Seibert, Horst Kaufmann
Life of this patent
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AssigneeStabilus GmbH
InventorsKarl Seibert, Horst Kaufmann
Estimating the term…
According to an illustrative example of the invention a cylinder is subdivided by a stationary partition wall into two pressure chambers. A first piston rod is sealingly introduced from atmosphere through one end wall of the cylinder into a first pressure chamber provided on one side of the partition wall. A second piston rod sealingly extends through said partition wall from the first pressure chamber on one side of the partition wall to a second pressure chamber on the other side of the partition wall. A lower gas pressure is provided in the first pressure chamber and a higher gas pressure is provided in the second pressure chamber. Abutment faces are allocated to the first and to the second piston rod. On inward movement of the first piston rod with respect to the cylinder the abutment faces enter into engagement after a predetermined path of inward movement of the first piston rod.
A gas spring having a plurality of pressure chambers (8, 16) arranged one behind another which are entered by displacement bodies (2, 14), a first pressure chamber (8) being formed by a cylinder (1) which comprises at its one end a seal (6) and a guide (7) for a first piston rod (2) forming a first displacement body (2), while the second pressure chamber (16) is arranged at the other end of the cylinder (1), said second pressure chamber (16) being closed off from the first pressure chamber (8) by a sealing and guide unit (9, 10, 11) axially fixed in the cylinder (1), for a second piston rod (14) forming a second displacement body (14), the second pressure chamber (16) having a higher filling pressure than the first pressure chamber (8), the second piston rod (14) cooperating through abutment means (17) with the first piston rod (2) as from a predetermined inward stroke of said first piston rod (2).
Dependencies are inferred from the claim text.