Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-01-23
1987-07-28
Bashore, S. Leon
Communications: electrical
Condition responsive indicating system
Specific condition
340661, 324 72, 364483, 343872, G08B 1326, G08B 2100
Patent
active
046834648
ABSTRACT:
A safety system and method, for use with apparatus having a conductive member where the apparatus changes the attitude and/or altitude of the conductive member during the operation of the apparatus, includes an antenna mounted on the conductive member which senses an electric field and provides an AC signal representative of the strength of the electric field. The peaks of the AC signal are averaged over several cycles to provide an average peak signal. A reference signal circuit derives the reference signal from either the average peak signal prior to the change in the member's attitude and/or altitude or while the member's attitude and/or altitude is changing. A control device connected to the averaging circuit and to the reference signal circuit prevents further changing of the conductive member's attitude and/or altitude in accordance with the average peak signal and the reference signal when the electric field strength is greater than a safe value.
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Brown Winthrop K.
Campsey Ronald L.
Greenhill Katherine L.
Lankford, Jr. Frank L.
Lin Chew-Chen
Anderson Andrew J.
Bashore S. Leon
Gillespie Ronald G.
Kulason Robert A.
O'Loughlin James J.
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