Class Information
Number: 175/421
Name: Boring or penetrating the earth > Bit or bit element > Symmetrical forked rotary type (e.g., fishtail)
Description: Apparatus comprising a rotary type bit provided with at least two axially extending branches terminating in cutting edges, the configuration of said axially extending branches and cutting edges being such that (1) more than one plane of bilateral symmetry may be passed through an axis coinciding with the rotary axis of the bit or (2) radial symmetry is presented about an axis coinciding with the rotary axis of the bit.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7392866 |
Roof drilling system improvements |
Jul. 1, 2008 |
| 6454029 |
Rotary boring bit and borer |
Sep. 24, 2002 |
| 6227317 |
Garden auger having wings and cutters |
May. 8, 2001 |
| 5647448 |
Drill bit having a plurality of teeth |
Jul. 15, 1997 |
| 5303787 |
Rotary mining tools |
Apr. 19, 1994 |
| 5180022 |
Rotary mining tools |
Jan. 19, 1993 |
| 5103922 |
Fishtail expendable diamond drag bit |
Apr. 14, 1992 |
| 4986373 |
Post hole digger |
Jan. 22, 1991 |
| 4813500 |
Expendable diamond drag bit |
Mar. 21, 1989 |
| 4776241 |
Cutting tool |
Oct. 11, 1988 |
| 4712952 |
Drill for generating of holes in a work piece |
Dec. 15, 1987 |
| 4320925 |
Dredge cutterhead tooth |
Mar. 23, 1982 |
| 4252202 |
Drill bit |
Feb. 24, 1981 |
| 4074780 |
Earth auger |
Feb. 21, 1978 |
| 3960218 |
Grass-clearing device for lawn-sprinkler heads |
Jun. 1, 1976 |
|
