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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
8689908 Drill bit having enhanced stabilization features and method of use thereof Apr. 8, 2014
8584777 Rotational drill bits and drilling apparatuses including the same Nov. 19, 2013
7537067 Rotary claw bit May. 26, 2009
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











 
 
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