초록 ▼

An actuator assembly includes an operating actuator and a holding actuator that are engageable with an operator member of a device. The operating actuation is cycled between on and off states to move the operator member in incremental steps, and the holding actuator is maintained in an active state

An actuator assembly includes an operating actuator and a holding actuator that are engageable with an operator member of a device. The operating actuation is cycled between on and off states to move the operator member in incremental steps, and the holding actuator is maintained in an active state to maintain or latch the current position of the operator member. Each of the operating and holding actuators may include one of the following: a solenoid actuator; and an actuator including one or more expandable elements, such as a piezoelectric element, a magnetostrictive element, and a heat-expandable element.

대표청구항 ▼

1. An apparatus for operating a device in a wellbore, comprising:at least a first and at least a second actuator activable by an input energy; and at least an operator member adapted to be moved in incremental steps by the first actuator and latched in its current position tby he second actuator, wh

1. An apparatus for operating a device in a wellbore, comprising:at least a first and at least a second actuator activable by an input energy; and at least an operator member adapted to be moved in incremental steps by the first actuator and latched in its current position tby he second actuator, wherein the second actuator is adapted to be maintained engaged with the operator member as the first actuator moves the operator member in incremental steps.