Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges
Reexamination Certificate
2000-02-09
2001-05-01
Wellington, A. L. (Department: 3722)
Cutting by use of rotating axially moving tool
Tool or tool with support
Having stepped cutting edges
C408S223000, C408S713000
Reexamination Certificate
active
06224302
ABSTRACT:
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention relates generally to a spade drill, and more particularly to a spade drill having the ability to drill as well as ream a hole simultaneously.
BACKGROUND AND SUMMARY OF THE INVENTION
There are many circumstances in the manufacturing industry that require the task of drilling a hole while leaving the hole somewhat undersized and then following behind the drilling operation with a secondary operation with a reamer to size the hole to the desired size. The number of operations that are required to manufacture a part is directly related to the cost of the part. Thus, it is desirable to provide a drill with the ability to drill as well as ream a hole simultaneously.
Accordingly, the spade drill of the present invention has the ability to drill as well as ream a hole simultaneously thereby eliminating the requirement for a secondary reaming operation after a hole is drilled. The spade drill includes a V-shaped drill cutting and a pair of reaming edges on each side thereof. The reaming edges have a relatively large radius of curvature and generally define a flat portion at the apex of the reaming edges.
Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood however that the detailed description and specific examples, while indicating preferred embodiments of the invention, are intended for purposes of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
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Carter Monica S.
Cole Carbide Industries, Inc.
Harness & Dickey & Pierce P.L.C.
Wellington A. L.
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