Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-05-22
1988-07-05
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
340649, 340660, 361 91, G08B 2100
Patent
active
047558059
ABSTRACT:
A system in which an electrically conductive boring device is caused to move through the ground to provide an underground tunnel, to install underground utilities, or for any other reason. A technique for detecting if the boring device electrically engages an underground source of high voltage such as an existing underground utility line. This arrangement, is also suitable for detecting if other electrically conductive apparatus, structural member, or like means engages a similar underground source of high voltage includes means defining an electrically conductive path leading from the boring device or other such member to a grounding point sufficient to reduce to a negligible level any high voltage to which the device or like member may be subjected. The present technique monitors the current through the grounding path and indicates if the current level through the path reaches a predetermined threshold level which is selected to correspond with the presence of high voltage.
REFERENCES:
patent: 3141156 (1964-07-01), Fredman et al.
patent: 3831160 (1974-08-01), Cronin et al.
patent: 3943409 (1976-03-01), Brown
FlowMole Corporation
Hofsass Jeffery A.
Orsino Joseph A.
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