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. 09, 1993
Filed:
May. 05, 1992
William E Richeson, Fort Wayne, IN (US);
North American Philips Corporation, New York, NY (US);
Abstract
An axially reciprocable working piston has opposed working surfaces facing opposed working chambers which are intermittently connected to respective cavities pressurized with compressed air. The working piston is connected to opposed seating pistons which cut off the connection between the cavity and working chamber behind the advancing piston and establish the connection in front of the piston, thereby conserving compressed air and storing potential energy for return movement of the piston. In either of two stable positions the working piston is hydraulically latched by fluid admitted to a respective chamber from another chamber through a two-way check valve. The check valve is electronically switched on commend to reverse the flow direction of the hydraulic fluid, thereby initiating movement between opposed stable positions.