DURABLE ROCK BIT FOR BLAST HOLE DRILLING

A rock bit (1) for blast hole drilling includes: a bit body (2) having a coupling (5) formed at an upper end thereof, a plurality of lower legs (6a), a dome (7) formed between the legs, and a bore formed through the coupling and the dome; a plurality of skirts (12a), each skirt covering a gap formed...

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Bibliographische Detailangaben
Hauptverfasser:	KONGAMNACH, AMNACH, BEAVERS, TONY JACK
Format:	Patent
Sprache:	eng ; pol
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Beschreibung
Zusammenfassung:	A rock bit (1) for blast hole drilling includes: a bit body (2) having a coupling (5) formed at an upper end thereof, a plurality of lower legs (6a), a dome (7) formed between the legs, and a bore formed through the coupling and the dome; a plurality of skirts (12a), each skirt covering a gap formed between adjacent legs and each skirt mounted to edges of adjacent legs; a plurality of roller cones (3a), each rotary cone rotatably mounted to a respective bearing shaft (8b) of a respective leg; a row of gage cutters (10g) mounted to each roller cone; a row of inner cutters (10a,10b) mounted to each roller cone; one or more nose cutters (10n) mounted to each roller cone; and a center jet (4) secured in the bore. Each cutter is an insert.