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:
Nov. 21, 1989
Filed:
Apr. 08, 1988
Fritz Bauer + Sohne oHG, Altdorf, DE;
Abstract
A gas spring substantially comprises a cylindrical housing, closed on one end, and a piston rod located concentrically in it and extending in a sealed manner from its other end, the piston rod being provided on its end located in the housing with a piston assembly resting on the inner wall of the housing and being guided in a damped manner. In order to attain a relatively broad hysteresis, which is desirable when the gas spring is used for retaining the upper parts of sun-tanning benches or automobile hatchbacks or the like, the piston assembly has a friction damping liner resting against the inner wall of the housing and made of an expanded plastic, which is open-celled and impregnated with lubricant on its friction face resting on the inner wall.