Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Reexamination Certificate
2005-08-16
2005-08-16
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
C408S226000, C408S227000
Reexamination Certificate
active
06929433
ABSTRACT:
A fluteless pyramid point drill for spotting holes for drills having an included angle from 90-160°. The preferred tool is double ended. Another embodiment features the pyramid point on the back end of a penetrating drill. An enhanced pyramid point geometry enables construction from technical ceramics. These embodiments included a notched pyramid, a dual pyramid, a beveled pyramid, and an eccentric pyramid. Another embodiment utilizes a grooved-body hollow pyramid for reaming holes. Geometries for a single sided penetrating drill for drilling hardened materials include a limited flute with a flute depth of ⅓ the drill diameter. Point angle embodiments include a 0-20° primary cutting edge and a steeper relief angle with a negative rake along the edge, a radial edge and steep relief angle with a negative rake along this edge. Additionally a pyramid point may be superimposed on the dual point angle for superior centering guidance.
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Galgano & Burke LLP
Howell Daniel W.
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