Cutting by use of rotating axially moving tool – Tool or tool with support – Having axial – core-receiving central portion
Patent
1996-08-16
1998-08-11
Pitts, A. L.
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
057918376
ABSTRACT:
A tool for cutting holes in metal provides a shank defining at one end an arbor releasably carrying a circularly annular cutter that defines teeth at each cutter end which may be sequentially used to extend cutter life without sharpening. The annular cutter defines a plurality of spirally arrayed, inwardly extending flutes and alternating outwardly extending lands on both inner and outer sides to provide cutting edges on both cutter sides at each end. The lands are formed with buttress type sides angulated ten to sixty degrees to a radius passing therethrough steeper spiral arrays of lands and grooves are arrayed in shallower spirals with an angle of up to seventy degrees to the axis of the cutter to allow thinner wall construction in my cutter than in prior cutters. The thinner cutter wall allows definition of more cutting teeth than would thicker walls and the cutter configuration allows definition of stronger, more efficient teeth without gullets. A species of the tool provides a medial support disk that is axially movable within the channel defined by the cutter to stiffen the cutter to allow still thinner wall construction.
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Bergman Keith S.
Pitts A. L.
Tsai Henry W. H.
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