Machining tools having concave cutting surfaces for...

Details Machining tools having concave cutting surfaces for... Machining tools having concave cutting surfaces for...

2006-03-13

2009-11-10

Ashley, Boyer D (Department: 3724)

Cutters, for shaping

Including tool having plural alternatively usable cutting edges

C407S120000

Reexamination Certificate

active

07614831

ABSTRACT:
A machining tool with a cutting surface adapted to provide a variable projected machining width during machining, including the cutting surface and a back surface. The cutting surface includes a first cutting edge and a second cutting edge that extend to a tip of the machining tool and a cross section normal to a centerline of the machining tool that is concave between the first cutting edge and the second cutting edge. The back surface forms a first acute angle with the cutting surface at the first cutting edge and a second acute angle with the cutting surface at the second cutting edge, such that the cross section of the back surface normal to the centerline of the machining tool is convex between the first cutting edge and the second cutting edge.

REFERENCES:
patent: 938434 (1909-10-01), Pierpont
patent: 5022797 (1991-06-01), Sawa et al.
patent: 5819826 (1998-10-01), Schmatjen
patent: 7140408 (2006-11-01), Hinchliff et al.
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patent: 2003/0223830 (2003-12-01), Bryan et al.
patent: 2007/0039433 (2007-02-01), Bryan et al.
patent: 2007/0221019 (2007-09-01), Ethington et al.
patent: 59201702 (1984-11-01), None

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