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:
Apr. 29, 1980
Filed:
Mar. 02, 1978
Nick Skover, Jr, Racine, WI (US);
Applied Power Inc., Milwaukee, WI (US);
Abstract
Disclosed are two embodiments of a locking cylinder. In both embodiments the locking cylinder comprises a housing, a working piston, a pilot piston, and a counter balance valve to substantially smoothen the operation of the working piston, particularly when an induced pressure is applied to the working piston. In the first embodiment, the pilot piston slides as a unit, although it may be formed in two axially separate parts. In the second embodiment, the pilot piston is formed in two axially separate parts, communicating bores are formed in the two parts, a ball valve is located in the bore in one of the parts, a free floating pin is disposed in the bores between the ball valve and an abutment surface in the other part, and the ball valve is biased shut. The pin is sized to unseat the ball valve when the two parts are in contact, but the two parts are biased apart by the action of the biasing means, which is transmitted through the pin to the abutment surface.