Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges
Patent
1977-08-05
1980-02-19
Culver, Horace M.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having stepped cutting edges
408228, 408229, 408230, B23B 5100, B23B 5102, B23G 1500
Patent
active
041892666
ABSTRACT:
A rotary drill bit for hand-held power drills comprises successively, a cutting section of progressively increasing diameter, a section of decreasing diameter and a shank portion for mounting the bit in a hand-held electric drill. The cutting section of the bit comprises a plurality of cutting edges disposed symetrically about the axis of rotation of the bit and extending rearwardly from the apex at an angle to the axis. The cutting edges have cutting portions and noncutting portions which are so-arranged that the cutting portions of one cutting edge cut selected diameters of a hole to be bored and cutting portions of another cutting edge cut other diameters of the hole whereby all cutting edges together cut all diameters of the hole. The sum of the lengths of the cutting portions of all of the cutting edges is approximately equal to the total length of one cutting edge so that the torque required to turn the bit is reduced. The cutting portions are disposed approximately to balance lateral forces on the bit during boring.
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Adams Bruce L.
Burns Robert E.
Culver Horace M.
Lobato Emmanuel J.
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