Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1984-01-27
1986-07-15
Dolinar, Andrew M.
Material or article handling
Vertically swinging load support
Shovel or fork type
414699, 37DIG1, 37DIG19, 172 6, 324329, E02D 1700
Patent
active
046003568
ABSTRACT:
An apparatus and process combining an excavation apparatus with a fully contained underground elongated conductive object detector capable of selectively detecting underground objects such as water pipes and electrical cables. The combination of this invention may be advantageously used in trenching to prevent damage to underground water pipes and electrical cables by detecting their presence before the digging implement damages them. An audible or visual signal may be activated and/or the excavation apparatus may be automatically shut down upon detection of an underground pipe or cable a few feet below the excavation. The detector may be incorporated in the digging shovel of a backhoe or maintained in position adjacent the digging implement by a boom extending from the excavation apparatus. Simple and sturdy time gated electronics is advantageously used to differentiate underground pipes and cables from other underground metal debris and to provide range and direction information.
REFERENCES:
patent: 3858737 (1975-01-01), Senoo
patent: 3907136 (1975-09-01), Christides et al.
patent: 4006481 (1977-02-01), Young et al.
Bridges Jack E.
Hofer, Jr. Kenneth E.
Sutkowski Robert J.
Dolinar Andrew M.
Gas Research Institute
Speckman Thomas W.
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