Boring or penetrating the earth – With signaling – indicating – testing or measuring
Patent
1988-07-11
1990-08-21
Dang, Hoang C.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
175323, 175394, 175409, 175410, E21B 1046
Patent
active
049497952
ABSTRACT:
A method of rapid earth excavation without damaging buried pipe, cable or other underground objects utilizes drills and augers having soft cutting edges and/or control of the torque and weight of the boring apparatus. In one embodiment, the bit of a drill, or bottom end of an earth auger is equipped with inserts formed of soft polymeric material. Another embodiment of an earth auger apparatus has soft polymeric material on the leading cutting surface of the flight, or the auger flight may be formed of soft polymeric material. The flexibility and low abrasion of the polymeric material prevents damage to the object contacted. Another embodiment has a dual concentric auger with a small earth-auger rotatably mounted inside the shaft of a larger auger and driven independently such that each is capable of providing and maintaining a torque adequate to create a given hole diameter but sufficiently below that which would damage the object expected to be encountered. Another embodiment has an indicator mounted forward of and below the leading cutting surface of the auger to warn the operator of a buried utility or to automatically stop the auger before the cutting surface contacts the buried utility.
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Cohen John H.
McDonald William C.
Pittard Gerard T.
Dang Hoang C.
Gas Research Institute
Mosely, Esq. Neal J.
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