ApplicationNo. 132339 filed on 12/14/1987
US Classes:60/567, Including plural separately operable master actuators or master units driving a common slave60/572, Having pulse fluid pressure or quantity compensating or adjusting means60/581Plural structurally related master pistons, cylinders or pulsator circuits
ExaminersPrimary: Look, Edward K.
Attorney, Agent or Firm
Foreign Patent References
International ClassB60T 007/00
Foreign Application Priority Data1986-12-12 GB
AbstractAn electro-hydraulic actuator assembly comprises a master piston-and-cylinder 32, 42 connected to be driven by a rotary actuator 56 and hydraulically connected to a slave master piston-and-cylinder 12 coupled to an output member, e.g. a throttle linkage rod 10, for automatic control of the displacement of the member 10. An override for manual control of the member 10 is provided by a valve 60 which, when opened, hydraulically shortcircuits the member 10 by equalizing pressures on the two sides of the slave piston 16. To re-establish automatic control and synchronize master and slave, a (possibly remote) controller 80 shuts the valve 60 and drives the actuator 56 until master and slave pistons both attain end positions; if necessary, by reopening valve 60 for a short time and continuing to drive the actuator 56.
Field of SearchIncluding plural separately operable master actuators or master units driving a common slave
Double-acting slave unit or opposed slaves having a single output
Having pulse fluid pressure or quantity compensating or adjusting means
Plural structurally related master pistons, cylinders or pulsator circuits
Having cam, or lever system driving master