Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges
Patent
1977-09-06
1978-11-28
McGehee, Travis S.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having stepped cutting edges
408220, B23B 5100
Patent
active
041273559
ABSTRACT:
A drill bit for drilling holes of a given diameter in wood or similar material comprising a drill body having a series of stepped cylindrical portions increasing in diameter from the small entry end of the drill to the full diameter of the hole to be drilled whereby the drill body is of generally conical shape. Each of the cylindrical portions extends in a helical direction, and a single flute extends generally lengthwise of the drill body to provide cutting edges for the cylindrical portions and a discharge path for material cut from the workpiece. The flute extends generally parallel to the axis of the drill and forms approximately a right angle in transverse cross section, occupying approximately one fourth of the cross sectional area of the drill body. A male thread extends helically along each of the cylindrical portions excepting the largest full diameter portion and projects radially outwardly from each of such portions to engage the walls of the workpiece and thus feed the drill through the workpiece. The several cylindrical portions and the male threads thereof extend at a common helix angle.
REFERENCES:
patent: 2897696 (1959-08-01), Tisserant
patent: 3564945 (1971-02-01), Bradley
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