Cutting by use of rotating axially moving tool – Tool or tool with support – Having axial – core-receiving central portion
Patent
1996-08-09
1998-09-08
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having axial, core-receiving central portion
408206, 408703, B23B 5104
Patent
active
058036776
ABSTRACT:
A hole saw comprises a cup with two cutting teeth positioned on the open end of the cup. The two cutting teeth are substantially diametrically opposed to one another to provide a balanced cutting engagement of the media and are spaced apart by a chord length of between about 45 to about 180 degrees. A pair of secondary gullets are positioned in the cup proximate to a forward cutting edge of the two cutting teeth. The secondary gullets have a predetermined depth and shape along a longitudinal axis of the cup to suitably remove debris from the cup during a portion of the duration of the hole cut. A plurality of raker teeth may be positioned on the chords defining the spacing between the cutting teeth. The raker teeth are disposed below the cutting teeth, approximately 0.030 inches to engage and move cutting debris formed by the cutting teeth.
REFERENCES:
patent: 2062257 (1936-11-01), Douglas et al.
patent: 3387637 (1968-06-01), Ferguson et al.
patent: 3430526 (1969-03-01), Valenziano
patent: 3559513 (1971-02-01), Hougen
patent: 5597274 (1997-01-01), Behner
Vermont American Corp., Power Tool Accessories and Hand Tools, Product Catalog, C-795, pp. 70-75 (Jul. 1995).
The Credo Company, Power Tool Accessories catalog, p. D2, (1989).
Brutscher David T.
Szymanski Donald M.
Bishop Steven C.
Credo Tool Company
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