Roof drill bit for mining

Description

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.

Claims

The ornamental design for a roof drill bit for mining, as shown and described.

---

Inventors:	Brady; William J. (Creve Coeur, MO)
Appl. No.:	07/706,113
Filed:	May 23, 1991

---

Current U.S. Class:	D15/139; D15/21
Field of Search:	;D15/21,139 ;175/377,378,393,418,420.1,427,430 ;299/79

---

References Cited [Referenced By]

---

U.S. Patent Documents

D265205	June 1982	Munson
D273390	April 1984	Lassiter
D273391	April 1984	Lassiter
4285618	August 1981	Shanley, Jr.
4637658	January 1987	Annipajo et al.
4683965	August 1987	Walton et al.
4733734	March 1988	Bardin et al.
4817742	April 1989	Whysong
4928777	May 1990	Shirley-Fisher

Primary Examiner: Ansher; Bernard
Assistant Examiner: Morris; Sandra
Attorney, Agent or Firm: Heywood; Richard G.