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. 21, 2004
Filed:
Jul. 23, 2002
Colin Robert Gedge, Poole, GB;
Andrew Bramwell, Crewkerne, GB;
Honeywell Normalair-Garrett (Holdings) Limited, Yeovil, GB;
Abstract
A hydraulic system for raising and lowering aircraft landing gear ( ) includes an actuator ( ) which is extendible and retractable to operate the landing gear, the actuator ( ) including a movable member ( ) in a casing ( ), the movable member ( ) being moved relative to the casing ( ) in a first direction to extend the actuator ( ) when fluid under pressure is supplied to a first side ( ) of the movable member ( ) while fluid is exhausted from a second side ( ) of the movable member ( ), and the movable member ( ) being moved in a second direction to retract the actuator ( ) when fluid under pressure is supplied to the second side ( ) of the movable member ( ) while fluid is exhausted from the first side ( ) of the movable member ( ), and there being selector valve ( ) selectively to supply pressurized fluid to the first ( ) or second ( ) side of the movable member ( ), and a check valve ( ) to permit exhausted fluid from at least one of the first ( ) and second ( ) sides of the movable member ( ) to augment the supplied fluid from the selector valve ( ) and thus be directed with the supplied fluid, to the second ( ) or first side ( ) respectively of the movable member ( ).