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Class Information
Number: 175/397
Name: Boring or penetrating the earth > Bit or bit element > Forked rotary nontracking
Description: Apparatus comprising a rotary type bit having a plurality of axially extending cutter elements or cutting edges which elements or edges contact the bottom of the bore and are spaced radially different distances from the longitudinal axis of rotation so that as the bit is rotated a portion of a cutter element or cutting edge engages a portion of the bore bottom not engaged by any other cutter element or cutting edge.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7228922 |
Drill bit |
Jun. 12, 2007 |
| 6932170 |
Drilling head |
Aug. 23, 2005 |
| 6302224 |
Drag-bit drilling with multi-axial tooth inserts |
Oct. 16, 2001 |
| 6227317 |
Garden auger having wings and cutters |
May. 8, 2001 |
| 6202768 |
Rock drilling tool and reamer for percussive drilling |
Mar. 20, 2001 |
| 6123161 |
Rotary drill bits |
Sep. 26, 2000 |
| 6032750 |
Drilling tool having a drill bit with primary and secondary cutting edges |
Mar. 7, 2000 |
| 5687807 |
Cutter head for trenchless boring machine |
Nov. 18, 1997 |
| 5377773 |
Drill bit having combined positive and negative or neutral rake cutters |
Jan. 3, 1995 |
| 4981184 |
Diamond drag bit for soft formations |
Jan. 1, 1991 |
| 4554986 |
Rotary drill bit having drag cutting elements |
Nov. 26, 1985 |
| 3995706 |
Earth auger drill |
Dec. 7, 1976 |
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