Appeal No. 96-3031
Application 08/098,062
2, 6 through 9, 13 and 14. Claims 15, 16, 18, 20 through 22 and
24, the only other claims pending in the application, also stand
allowed.
The invention relates to “a cutting insert for use in a
drill bit for cutting holes in a mine roof” (specification, page
1). Claim 1 is representative of the subject matter on appeal
and reads as follows:
1. A cutting insert for a rotary roof bit used for
drilling holes in a mine roof, comprising a body formed of hard
material and including first and second main surfaces, first and
second end surfaces, a bottom surface, and a top surface; said
first and second main surfaces being spaced apart by a thickness
of said body; said first and second end surfaces being spaced
apart by a width of said body; said top and bottom surfaces being
spaced apart by a height of said body; a maximum width of said
body being greater than a maximum height of said body; said top
surface including first and second top sections, said first top
section intersecting said first main surface to define therewith
a first cutting edge; said first top section being inclined
downwardly from said first cutting edge to said second main
surface to form a relief; said second top section intersecting
said second main surface to define therewith a second cutting
edge; said second top section being inclined downwardly from said
second cutting edge to said first main surface to form a relief;
each of said first and second cutting edges comprising a
plurality of cutting edge segments forming obtuse angles between
one another as said insert is viewed in a direction perpendicular
to said main surfaces; an outermost one of said cutting edge
segments of each cutting edge forming an angle of at least 120
degrees with said respective end surface, said body including an
axial notch disposed at a center of said top surface between said
cutting edges, said notch extending completely across the
thickness of said body.
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Last modified: November 3, 2007