Gas spring

US4944498A · kind A · utility

Assignee

• Stabilus GmbH · DE

Inventors

• Bernd Kortgen · Adenau, DE
• Helmut Morgen · Saarburg, DE
• Heinz-Josef Heinrichs · Koblenz, DE
• Castor Fuhrmann · Brachtendorf, DE
• Herbert Freitag · Koblenz, DE

Key dates

• Filing date: Jul 13, 1988
• Grant date: Jul 31, 1990
• Expiry date: Jul 13, 2008

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16J15/40
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

In a gas spring the piston rod is guided through one end of a container. Adjacent to this one end two sealings are provided in axial direction one behind the other, namely an axially outer sealing and an axially inner sealing. A liquid chamber is defined between the axially outer sealing and the axially inner sealing. The axially inner sealing comprises a sealing ring of elastomeric material. This sealing ring comprises a radially outer root portion and a radially inner lip portion. The root portion engages an internal circumferential surface of the container tube. The lip portion engages an external circumferential surface of the piston rod. The axial dimension of the root portion is substantially larger than the axial dimension of the lip portion. The sealing ring may be deflected by pressure differences on both sides of the sealing ring such that a fluid exchange is possible between both axial sides of the sealing ring when the pressure difference exceeds a predetermined value.