|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||60/406 ; 91/363A ; 91/387 ; 91/461|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 17 인용 특허 : 8|
The present invention provides a servo-actuator capable of operating in both the Fail Safe and Fail Operate modes. In the Fail Safe mode, a pretensioned spring member moves a jet pipe in the servo-valve to cause said actuator rod to move in a first direction upon loss of electric power. A mechanical feedback means coupled to said spring member and said actuator rod opposes the force applied by the spring so that when a force equilibrium is reached the actuator rod will be at a predetermined position.
[ What is claimed is:] [1.] A servo-actuator with Fail Safe means comprising:an actuator having a rod for coupling to a member requiring actuation, said rod being capable of movement between a retracted first position and a second position;an electronic control unit;a servo-valve comprising a torque motor, a jet pipe, a spool valve, and a first plurality of conduits, said first plurality of conduits providing fluid communication between said jet pipe and said spool valve;said torque motor operatively attached to said jet pipe and said electronic control ...