Patent ID: 6446432
Filing Date: 2002-09-10
Classification: B64C,F15B

Abstract:
A servoactuator for use in a redundant control actuation system, said servoactuator having a body, said servoactuator comprising:a control valve mounted on said body and arranged to provide a hydraulic output in response to a control signal; a hydraulic actuator mounted on said body and arranged to move a load in response to the hydraulic output from said control valve; and logic valve means mounted on said body and operatively associated with said control valve and actuator, said body communicating with a source of pressurized fluid and with a fluid return, said body being provided with an external hydraulic signal, said logic valve means being supplied with hydraulic and electrical signals and being operatively arranged between said control valve and said actuator to either (a) permit control operation of said actuator in response to said control signal, (b) permit said actuator to move freely and independently of said control signal, or (c) restrain movement of said load independently of said control signal, as a function of said supplied hydraulic and electrical signals, said logic valve means being arranged to provide a hydraulic output signal external of said body which is a function of said hydraulic and electrical signals.