Electro-hydraulic actuator assembly
Patent 4872310 Issued on October 10, 1989. Estimated Expiration Date: 
December 14, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 14, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorAssigneeApplicationNo. 132339 filed on 12/14/1987US 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 circuitsExaminersPrimary: Look, Edward K.Attorney, Agent or FirmForeign Patent References
International ClassB60T 007/00Foreign Application Priority Data1986-12-12 GBAbstractAn 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 slaveDouble-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 Fuel | |
