Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-04-30
1991-03-19
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
324 725, 340662, 340664, G83
Patent
active
050014650
ABSTRACT:
A plurality of electrostatic field proximity sensors are mounted upon a crane boom. The sensors are capacitive elements and include an antenna. The sensors are electrically connected in parallel with a single wire. A summing amplifier is coupled to the sensors for detecting changes in flux fields, which changes could signal a dangerous condition. The sensors can comprise an electrically insulating body having first and second ends with a conductive member attached to one of the ends. A mounting means is provided at the other one of the ends. A resistor can be electrically connected between the ends to discharge excess static charge and to allow detection of missing sensors.
REFERENCES:
patent: 2615969 (1952-10-01), Albrecht
patent: 4064997 (1977-12-01), Holland et al.
McNeill William H.
Swann III Glen R.
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