Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Cleansing fluid passage
Patent
1983-07-25
1986-02-11
Novosad, Stephen J.
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Cleansing fluid passage
299 16, 299 17, E21C 2560, E21C 708, E21F 502
Patent
active
045695580
ABSTRACT:
A mounting movable with respect to an adjacent hard face has a projecting drag bit adapted to engage the hard face. The drag bit is disposed for movement relative to the mounting by encounter of the drag bit with the hard face. That relative movement regulates a valve in a water passageway, preferably extending through the drag bit, to play a stream of water in the area of contact of the drag bit and the hard face and to prevent such water play when the drag bit is out of contact with the hard face.
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Hood, M., 1978, A Study of Methods to Improve the Performance of Drag Bits Used to cut Hard Rock", PhD. Thesis, University of Witwatersrand, R.S.A.
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Goodwin Michael
Novosad Stephen J.
The Regents of the University of California
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