Method and apparatus for warning of potential harm to an undergr

Details Method and apparatus for warning of potential harm to an undergr Method and apparatus for warning of potential harm to an undergr

1995-04-28

1996-09-17

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

340539, 340566, 340943, G08B 1300, G08G 104

Patent

active

055572588

ABSTRACT:
Potential harm to an underground utility conveyance (12), resulting from excavation by a backhoe (14) in the vicinity of the conveyance, is sensed by a sensor (32, 40, 42 or 44) that detects a disturbance attributable to the presence of the backhoe. In response to the sensor detecting such a disturbance, a control unit (34) triggers a warning device (36, 38) to generate a warning to alert the backhoe operator of the presence of the underground utility conveyance (12).

REFERENCES:
patent: 3435405 (1969-03-01), Persson
patent: 3860912 (1975-01-01), Romans
patent: 4158832 (1979-06-01), Barnes, Jr. et al.
patent: 4363031 (1982-12-01), Reinowitz
patent: 4652861 (1987-03-01), Domes
patent: 4816827 (1989-03-01), Baloutch et al.
patent: 4953144 (1990-08-01), Chin et al.
patent: 5146209 (1992-09-01), Beghelli

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