Rotary drill bits
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United States of America Patent
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-
Nov 17, 1992
Grant Date -
N/A
app pub date -
Oct 31, 1991
filing date -
Oct 31, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A rotary drill bit comprises a bit body carrying a plurality of preform cutting elements, and a plurality of circumferentially spaced gauge pads which, in use, engage the surrounding formation. Some of the gauge pads carry cutting elements and others are free of cutting elements. To reduce cost, each gauge pad which is free of cutting elements has an outer bearing surface which is more abrasion resistant than the outer surfaces of the gauge pads which carry cutting elements.
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