Roof drill bit for mining machine

Description

FIG. 1 is a top plan view of a roof drill bit for mining machine illustrating one embodiment of the invention;

FIG. 2 is a side elevational view of the roof drill bit for mining machine of FIG. 1, the opposite side being a mirror image;

FIG. 3 is another side elevational view of the roof drill for mining machine, as rotated 90 degrees clockwise from FIGS. 1 and 2 thereof, the opposite side being a mirror image;

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 similiar to FIG. 1, but showing a second embodiment of the roof drill bit for mining machine;

FIG. 7 is a side elevational view of the second roof drill bit for mining machine embodiment shown in FIG. 6, the opposite side being a mirror image;

FIG. 8 is another side elevational view of the second roof drill bit for mining machine, as rotated 90 degrees clockwise from FIGS. 6 and 7 thereof, the opposite side being a mirror image;

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 representation of the fragmentary drive steel end portion of the mining machine shown in phantom lines is for environmental purposes only and non-limiting upon the scope of the invention.

Claims

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

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Inventors:	Brady; William J. (Creve Coeur, MO)
Appl. No.:	D/010,851
Filed:	July 19, 1993

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Related U.S. Patent Documents

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	Application Number	Filing Date	Patent Number	Issue Date
	706113	May 23, 1991	D. 340248

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Current U.S. Class:	D15/139
Field of Search:	;175/379,385,393,418,420.1,421,430,427,431,432 ;299/29 ;D10/138,139

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References Cited [Referenced By]

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U.S. Patent Documents

4440247	April 1984	Sartor
4733734	March 1988	Bardin et al.
4817742	April 1989	Whysong
4928777	May 1990	Shirley-Fisher

Primary Examiner: Douglas; Alan P.
Assistant Examiner: Davis; Antoine D.
Attorney, Agent or Firm: Heywood; Richard G.