Method and apparatus for cancelling the electrostatic potential

Details Method and apparatus for cancelling the electrostatic potential Method and apparatus for cancelling the electrostatic potential

1985-05-15

1988-04-12

Peters, Jr., Joseph F.

Aeronautics and astronautics

Miscellaneous

244 1711, 361218, B64D 4502

Patent

active

047369060

ABSTRACT:
A rescuer (1) is lowered at the end of cable (2) from a helicopter having a winch (4) on which the cable is wound. The rescuer is provided with a electric field sensor (20) which is downwardly directed and which is connected to a radio transmitter (22). The helicopter (3) has a corresponding radio receiver (24) which serves to actuate an active static discharger which is servo-controlled to the electrical magnitude supplied by the sensor (20). The servo-control is such that the potential difference between the rescuer (11) and the person to be rescued (10) is progressively reduced as the rescuer approaches the person to be rescued. Practically all risks of an electric shock on making contact are thus avoided.

REFERENCES:
patent: 3260893 (1966-07-01), De la Cienva et al.
patent: 3600632 (1971-08-01), Bright et al.
patent: 3846700 (1974-11-01), Sasaki et al.
patent: 3857066 (1974-12-01), Cline et al.
patent: 3874616 (1975-04-01), Buser et al.
patent: 4059846 (1977-11-01), Eisenhauer
patent: 4101825 (1978-07-01), Truax

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