Cutting by use of rotating axially moving tool – Tool or tool with support – Having axial – core-receiving central portion
Patent
1983-09-12
1985-12-10
Briggs, William R.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having axial, core-receiving central portion
408206, B23B 4102
Patent
active
045576416
ABSTRACT:
A hole cutter has a fluted annular wall formed with a plurality of circumferentially spaced teeth around the lower end thereof, the successive teeth being connected by webs of reduced thickness. Between successive teeth each web is formed with a gullet, the upper end of which is defined by a wall which inclines upwardly in a radially outward direction. The upper end wall of the gullet comprises a radially inner section and a radially outer section. The radially inner section is inclined to the horizontal at a substantially less angle than the radially outer section. The two wall sections intersect in a shoulder which is spaced substantially closer to the radially inner face of the web that the radially outer face of the web.
REFERENCES:
patent: 3609056 (1971-09-01), Hougen
patent: 3860354 (1975-01-01), Hougen
patent: 4322188 (1982-03-01), Hougen
patent: 4452554 (1984-06-01), Hougen
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