Unplugging apparatus

Details Unplugging apparatus Unplugging apparatus

1990-07-06

1992-01-21

Pellinen, A. D.

Electrical transmission or interconnection systems

Miscellaneous systems

361 1, 361170, H01R 13635

Patent

active

050830422

ABSTRACT:
An unplugging apparatus includes an electrical sensing circuit for sensing the approach of an electrical storm, and a mechanical actuator for disconnecting a power cord plug from a receptacle in response to a signal from the sensing circuit. The sensing circuit and the mechanical actuator are mounted within a housing. A pull cord extends from the housing and is connected to the power cord plug to disconnect the plug from the receptacle. The other end of the pull cord is connected to a pivotable trigger arm, which pivots to pull the pull cord in response to activation by the sensing circuit. A coil spring biases the trigger arm so as to pull the pull cord, and a latch is operable to retain the trigger arm until actuated by the sensing circuit. A solenid is energized to operate the latch and release the trigger arm, by a signal from the sensing circuit. The sensing circuit includes a detector circuit which receives static produced by lightning in the form of radio waves. The detector circuit produces a signal in response to radio waves of a predetermined amplitude. The signal produced by the detector circuit is then converted to a audio signal and amplified. The amplified signal will energize a relay which closes a second circuit energizing the solenoid.

REFERENCES:
patent: 2265868 (1941-12-01), Schonland
patent: 4276576 (1981-06-01), Uman
patent: 4702537 (1987-10-01), Mattingly et al.

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