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. 27, 1981
Filed:
Dec. 11, 1979
Applicant:
Inventors:
David K Andrews, Cheltenham, GB;
Michael W Smart, Gloucester, GB;
Assignee:
Dowty Fuel Systems Limited, Cheltenham, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
9141 / ; 91459 ; 13762545 ; 13762565 ; 251129 ; 335276 ;
Abstract
A mechanism for controlling the position of a movable member and for locking it in any desired position comprising a hydraulic displacement device movable with the member and a slide valve hydraulically connected to the displacement device to control flow of liquid to or from the device. The slide valve includes a pre-loaded spring, capable in the absence of other force of moving the slide valve to its closed position to lock the member against movement. A force motor is operable when desired to move the slide valve to its open position to permit movement of the member.