Flight lock actuator with dual energy sources
First Claim
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1. A method for providing improved reliability in an aircraft door flight lock actuator comprising:
- storing energy provided to the actuator during a powered locking stroke of the actuator in a mechanical energy storage means;
storing energy provided to the actuator, during a powered locking stroke of the actuator and while the actuator is in a state of powered stall in a locked position, in an electrical energy storage means;
powering the actuator using the energy stored in the mechanical energy storage means to complete an unlocking stroke;
powering the actuator using the energy stored in the electrical energy storage means to complete the unlocking stroke, in the event that the energy stored in the mechanical energy storage means does not successfully power the actuator to complete the unlocking stroke;
controlling a linear velocity of the actuator; and
controlling a current supplied to the actuator while the actuator is in said state of powered stall.
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Abstract
A flight lock actuator that can be powered by two sources of stored energy when aircraft power has been switched off. A mechanical energy storage means and an electrical energy storage means provide a fully redundant energy storage system that stores sufficient energy to complete the actuator'"'"'s extension stroke when aircraft power is removed. The actuator has a motor control system that limits the stroke velocity for both the extension and retraction strokes, including a damper feature capable of effectively braking the actuator during the back-driven extension stroke.
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Citations
11 Claims
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1. A method for providing improved reliability in an aircraft door flight lock actuator comprising:
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storing energy provided to the actuator during a powered locking stroke of the actuator in a mechanical energy storage means; storing energy provided to the actuator, during a powered locking stroke of the actuator and while the actuator is in a state of powered stall in a locked position, in an electrical energy storage means; powering the actuator using the energy stored in the mechanical energy storage means to complete an unlocking stroke; powering the actuator using the energy stored in the electrical energy storage means to complete the unlocking stroke, in the event that the energy stored in the mechanical energy storage means does not successfully power the actuator to complete the unlocking stroke; controlling a linear velocity of the actuator; and controlling a current supplied to the actuator while the actuator is in said state of powered stall. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for providing improved reliability in an aircraft door flight lock actuator comprising:
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means for storing energy provided to the actuator during a powered locking stroke of the actuator in a mechanical energy storage means; means for storing energy provided to the actuator, during a powered locking stroke of the actuator and while the actuator is in a state of powered stall in a locked position, in an electrical energy storage means; means for powering the actuator using the energy stored in the mechanical energy storage means to complete an unlocking stroke; means for powering the actuator using the energy stored in the electrical energy storage means to complete the unlocking stroke, in the event that the energy stored in the mechanical energy storage means does not successfully power the actuator to complete the unlocking stroke; and means for controlling a linear velocity of the actuator and for controlling a current supplied to the actuator while the actuator is in said state of powered stall. - View Dependent Claims (9, 10, 11)
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Specification