Excavating – Rotary digger
Patent
1974-05-06
1976-01-06
Crowder, Clifford D.
Excavating
Rotary digger
37 65, 37DIG1, 37DIG19, 324 3, 324 41, 340258C, 340421, E02F 388
Patent
active
039303241
ABSTRACT:
A mechanical hole digging machine comprising a rotary cutting tool and a suction tube having an inlet opening adjacent to the cutting tool, a suction device for applying suction to the tube remote from the inlet opening to cause material cut away by the cutting tool to be sucked inwards through the inlet opening, the cutting tool and part at least of the suction tube being carried on a mounting by which they are movable upwards and downwards. An electromagnetic metal detector comprising three coils is mounted near the cutter head and adapted in use to give an indication of the presence of buried metal service pipe during a hole digging operation.
REFERENCES:
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patent: 2561152 (1951-07-01), Stryker
patent: 2801479 (1957-08-01), Braver
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patent: 3253357 (1966-05-01), Allard
patent: 3474549 (1969-10-01), Schnell
patent: 3706142 (1972-12-01), Brunner
patent: 3763424 (1973-10-01), Bennett, Jr. et al.
Miller Timothy John Eastham
Ward Edward Anthony
Wightman David Douglas
British Gas Corporation
Crowder Clifford D.
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