Stone working – Sawing – Rotary
Reexamination Certificate
2006-10-10
2006-10-10
Morgan, Eileen P. (Department: 3723)
Stone working
Sawing
Rotary
C125S015000, C451S541000, C451S546000, C451S547000
Reexamination Certificate
active
07117863
ABSTRACT:
An improved circular saw blade designed for cutting fiber cement workpieces, which are becoming more and more prevalent on the construction site, includes a PCD/carbide tip (16) mounted in the rim (31) of the saw blade (10) at six, rather than the usual for locations, equally spaced around the blade. The tips are mounted adjacent a relatively large-diameter, semi-circular gullet (20), which itself is preceded by a chip and dust minimizer (18). The minimizer includes several alternating hills (52) and valleys (54) formed in the rim of the saw blade, each hill and valley having the same radius, producing a sinuous array essentially centered on the rim of the blade. It has been discovered that such a dust and chip minimizer reduces the level of dust and chips produced by the blade and clears the same from the kerf generated in the blade-workpiece interface. Ideally, all of the parameters and relief angles for the surfaces on the saw blade tip can be generated by cutting an array of such tips from a large-diameter blank (110) of PCD fused to a layer of tungsten carbide (72), and by mounting the tips onto the blade in such an orientation as to present, preferably, a negative hook or rake angle (74) to the workpiece.
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Curtsinger John R.
Dassoulas Stephen C.
Edwards Dean
Lindberg, legal representative Laura
McClaskey Steve
Black & Decker Inc.
Harness & Dickey & Pierce P.L.C.
Morgan Eileen P.
LandOfFree
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