Mechanical return fail-safe actuator for damper, valve, elevator or other positioning device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 8, 2000
Grant Date -
N/A
app pub date -
Feb 19, 1999
filing date -
Feb 19, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The electrically powered actuator includes a capacitor for supplying supplemental electrical power to a motor in response to a loss of power to the motor from a main power source in order to enable the motor to overcome the magnetic resistance of the motor and a frictional resistance of a gear train in order to bias a positioning device into a retracted fail-safe position. The supplemental electrical power supplied to the motor supplements the biasing force of a spring or the like for biasing the positioning device from an extended position into the retracted fail-safe position. The capacitor is connected to the electrical circuit of the motor so as to be charged during normal operation of the motor and for delivering a pulse of reverse polarity power to the motor in response to a loss of power to the motor from the main source of power.
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- Non-US Classification not provided for expired patents
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Patent Citation Ranking
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