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. 04, 1990
Filed:
May. 11, 1989
Leo Enrietti, Aostatal, IT;
A. Raymond, , DE;
Abstract
A device for assisting in the opening and closing of a pivotally mounted member comprising an elongated housing having a closed end and an open end and an inner annular cylindrical space. An annular cylindrical slide having an inner and an outer end is slidably mounted in the space for longitudinal movement into and out of the housing and a spring centrally mounted between the housing and the slide retains the slide in the housing in a retracted position. Braking devices are provided for retarding movement of the slide in either direction that include nozzle-shaped orifices communicating the inner space with the outside of the housing so that air has to flow into and out of said orifice as the slide moves relative to the housing. Locking devices hold the slide in an extended position, the locking devices being releaseable by pulling the slide out of the housing a short distance, and journal devices are at the outer end of the slide for connecting the slide to a pivotally mounted member.