Durable rock bit for blast hole drilling
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United States of America Patent
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Jul 30, 2019
Grant Date -
Feb 15, 2018
app pub date -
Aug 7, 2017
filing date -
Aug 9, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A rock bit for blast hole drilling includes: a bit body having a coupling formed at an upper end thereof, a plurality of lower legs, a dome formed between the legs, and a bore formed through the coupling and the dome; a plurality of skirts, each skirt covering a gap formed between adjacent legs and each skirt mounted to edges of adjacent legs; a plurality of roller cones, each rotary cone rotatably mounted to a respective bearing shaft of a respective leg; a row of gage cutters mounted to each roller cone; a row of inner cutters mounted to each roller cone; one or more nose cutters mounted to each roller cone; and a center jet secured in the bore. Each cutter is an insert.
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