Gas spring having an intermediate stop function and temperature compensation

US6179099A · kind A · utility

Assignee

• Stabilus GmbH · DE

Inventors

• Klaus Koch · Sankt Goarshausen, DE
• Rainer Sauer · Anschau, DE
• Oliver Schuttler · Monreal, DE

Key dates

• Filing date: Dec 7, 1998
• Grant date: Jan 30, 2001
• Expiry date: Dec 7, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/52
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A gas spring includes a cylinder containing a fluid at least part of which is a compressed gas. The cylinder receives a piston that is affixed to a piston rod and divides the cylinder into two working chambers. The piston has a one-way valve that is cycled in response to the direction of motion of the piston and pressure-control valve consisting of a spring and a valve body. In a partial stroke region of the piston a bypass allows fluid flow past the one-way valve and the pressure-control valve. The partial stroke region is adjoined by a bypass-free stroke region, the gas spring being arrested in the bypass-free stroke region. The spring of the pressure-control valve has a temperature-dependent elastic force, the elastic force of the spring increasing with increasing operating temperature, owing to which the compressive force necessary for opening the pressure-control valve increases to an equal extent.