Bit or bit element > Bit with leading portion (e.g., pilot) forming smaller diameter initial bore > Leading portion is forked rotary type > Patents

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Class Information
Number: 175/392
Name: Boring or penetrating the earth > Bit or bit element > Bit with leading portion (e.g., pilot) forming smaller diameter initial bore > Leading portion is forked rotary type
Description: Apparatus comprising a rotary bit in which the leading or pilot portion is provided with two or more axially extending branches terminating in cutting edges.

Patents under this class:

Patent Number	Title Of Patent	Date Issued
6502649	Ice auger cutting head	Jan. 7, 2003
6202768	Rock drilling tool and reamer for percussive drilling	Mar. 20, 2001
4550791	Two-prong rotary bit, especially for use with roof drills, and insert therefor	Nov. 5, 1985
4074780	Earth auger	Feb. 21, 1978
3995706	Earth auger drill	Dec. 7, 1976