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. 20, 1993
Filed:
Jun. 13, 1991
Applicant:
Inventors:
William E Richeson, Fort Wayne, IN (US);
Frederick L Erickson, Fort Wayne, IN (US);
Assignee:
North American Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01L / ; F16F / ; F16K / ;
U.S. Cl.
CPC ...
251 48 ; 123 9012 ; 123 9066 ; 251263 ; 251337 ;
Abstract
Valve assembly includes a stem having a first section toward the cam and a second section toward the valve face, the first section having a larger diameter than the second section. A housing defines a closed chamber having a first bore which closely receives said first section and a coaxial second bore which closely receives the second section. As the cam rotates to lift the valve face from the valve seat, the first section acts as a piston which increases pressure of hydraulic fluid in the chamber to provide a spring force to return the valve.