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:
Sep. 05, 1989
Filed:
Feb. 08, 1988
Applicant:
Inventor:
Jorg Dantlgraber, Lohr-Sackenbach, DE;
Assignee:
Mannesmann Rexroth GmbH, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05B / ;
U.S. Cl.
CPC ...
318625 ; 251 14 ; 25112911 ; 1374875 ;
Abstract
An electro-hydraulic servo-valve having a valve spool and comprising: an adjustment motor, and a control apparatus for adjusting said adjustment motor to depending on the input nominal value, wherein said adjustment motor transmits its movement directly to the valve spool of the hydraulic valve, and wherein a preferably electrically operating additional drive is provided which will be switched on in case the valve spool gets stuck so as to release the valve spool from its stuck condition.