Roof drill bit for mining
FIG. 1 is a top plan view of a roof drill bit for mining illustrating one embodiment of the invention;
FIG. 2 is a side elevational view of the roof drill bit of FIG. 1, the opposite side view therefrom being the same;
FIG. 3 is another side elevational view of the roof drill bit, as rotated 90.degree. clockwise from the FIGS 1 and 2 position thereof, the opposite side view therefrom being the same;
FIG. 4 is a bottom view of the roof drill bit of FIG. 1;
FIG. 5 is a perspective view of the roof drill bit of FIG. 1;
FIG. 6 is a top plan view similar to FIG. 1, but showing a second embodiment of the roof drill bit for mining;
FIG. 7 is a side elevational view of the second roof drill bit embodiment shown in FIG. 6, the opposite side view therefrom being the same;
FIG. 8 is another side elevational view of the second roof drill bit embodiment, as rotated 90.degree. clockwise from the FIGS. 6 and 7 position thereof, the opposite side view therefrom being the same;
FIG. 9 is a bottom view of the roof drill bit embodiment of FIG. 6; and,
FIG. 10 is a perspective view of the roof drill bit of FIG. 6.
The fluted shank illustrated in phantom lines in FIGS. 2, 3, 5 and 7, 8, 10 is shown for environmental purposes and is non-limiting upon the scope of the invention.
| D265205 | June 29, 1982 | Munson |
| D273390 | April 10, 1984 | Lassiter |
| D273391 | April 10, 1984 | Lassiter |
| 4285618 | August 25, 1981 | Shanley, Jr. |
| 4637658 | January 20, 1987 | Annipajo et al. |
| 4683965 | August 4, 1987 | Walton et al. |
| 4733734 | March 29, 1988 | Bardin et al. |
| 4817742 | April 4, 1989 | Whysong |
| 4928777 | May 29, 1990 | Shirley-Fisher |
Type: Grant
Filed: May 23, 1991
Date of Patent: Oct 12, 1993
Inventor: William J. Brady (Creve Coeur, MO)
Primary Examiner: Bernard Ansher
Assistant Examiner: Sandra Morris
Attorney: Richard G. Heywood
Application Number: 7/706,113
