The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 22, 1992
Filed:
Oct. 28, 1991
Bernard J Wallis, Dearborn, MI (US);
Other;
Abstract
A self contained gas spring comprising a housing having a closed end and an open end, and a cylindrical bore. A cylindrical sleeve is inserted into the bore of the housing. The sleeve has at least a portion thereof forming an internal cylindrical surface. A piston rod has a piston within the cylindrical surface. The sleeve defines a space between the sleeve and the bore of the housing. This space communicates with the space of said cylindrical surface at the piston end of the piston rod. A charging valve is provided in the closed end of said housing for charging the space at the piston end of said piston rod and the space between the sleeve and the housing with gas under pressure. Preferably, the die cylinder includes sufficient volumetric space such that the pressures in the self contained gas spring do not increase substantially during the movement of the piston within the cylinder.