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:
Oct. 05, 1993
Filed:
Jan. 24, 1992
Edwards H Phillips, Troy, MI (US);
Techco Corporation, Troy, MI (US);
Abstract
The present invention is directed to a hydro-mechanical or electro-hydro-mechanical control system utilized for positioning a mechanical device. The control system incorporates an improved closed-center control valve for selectively controlling the differential pressure applied to the input ports of a power output transducer and the differential flow therebetween in response to a mechanically applied rotational input. The power output transducer is then utilized to position a mechanical device. The control system is a closed loop circuit adapted to supply hydraulic fluid at a desired supply pressure to the control valve. The improved closed-center control valve is a modified rotary valve wherein parasitic leakage slots are formed for providing a leakage flow pathway through the control valve between the input ports of the power output transducer.