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. 10, 1985
Filed:
Nov. 21, 1984
Applicant:
Inventors:
Roger Chanal, Saint Etienne, FR;
Daniel Cotte, Le Chambon Feugerolles, FR;
Assignee:
Bennes Marrel, , FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
137510 ; 137528 ; 137529 ; 137903 ;
Abstract
A safety valve designed for relieving pressure in a mine support jack. A washer and check valve are positioned in a counterbore located on the front surface of a resilient gasket member. A leg extends from the rear surface of the resilient gasket and extends through a rear chamber to support the check valve in a position sealing the outlet port. The rear chamber is filled with pressurized gas to form a gas cushion. The end of the leg is positioned to seal an inflation orifice.