Gas spring having a plurality of pressure chambers arranged one behind another

US4909488A · kind A · utility

Assignee

• Stabilus GmbH · DE

Inventors

• Karl Seibert · Alken, DE
• Horst Kaufmann · Bernkastel-Kues, DE

Key dates

• Filing date: May 30, 1989
• Grant date: Mar 20, 1990
• Expiry date: May 30, 2009

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/26
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

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.