Patent · US Expired

Gas spring for balancing the weight of the lid on the trunk of a motorcar and like applications

US4240619A · kind A · utility

24Cited by

6References

12Claims

0Family size

Assignee

Stabilus GmbH · DE

Inventors

Winfried Wirges · Koblenz, DE
Guenter Bauschke · Neuhäusel, DE

Key dates

Filing date	Jul 24, 1978
Grant date	Dec 23, 1980
Priority date	—
Expiry date	Jul 24, 1998

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE05Y2900/548
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A gas spring includes a cylinder, filled with compressed gas, a piston rod movable axially inward and outward of the cylinder cavity, and a piston axially movable on the end of the piston rod in the cavity and resiliently biased into engagement with an abutment on the free end of the piston rod. One of two passages bounded by the piston and connecting the two compartments into which the cylinder cavity is divided by the piston is blocked when the piston engages the abutment and opened when the piston is moved away from the abutment against the resilient bias. The other passage is opened during outward movement of the piston rod from the cylinder cavity.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.