Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-09-12
1997-11-04
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340661, 340664, 361 7, 361 79, G08B 2100
Patent
active
056844662
ABSTRACT:
An electrical strike sensing system for providing an alarm if the underground boring equipment encounters a potentially hazardous condition. The system senses current carried through the equipment, as well as the voltage between the equipment and a reference. The measured current is converted to a percentage of a reference current, and the voltage is converted to a percentage of a reference voltage. The current and voltage percentages are added, and if the sum exceeds 100%, the alarms are activated. The current and voltage percentages, as well as the date and time of the strike, are stored in a nonvolatile memory.
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Video entitled "Important Information From Ditch Witch", The Underground Authority.
"Original ESS" system: Electric Strike Indicator System Operator Instructions, Electrical Strike Indicator Device (ESID), Technical Bits, Electrical Strike Simulator, and schematics.
Edwards Joel B.
Keating Donald J.
Mitchell Bradley E.
Self Kelvin P.
Hofsass Jeffery
The Charles Machine Work, Inc.
Wu Daniel J.
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