Axially self-aligning drill bit

Details Axially self-aligning drill bit Axially self-aligning drill bit

1984-06-13

1990-03-06

Spruill, Robert L.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408226, 408228, B23B 5100, B27G 1500

Patent

active

049061461

ABSTRACT:
A drill bit having an elongated, stiffly flexible shank and integral, hardened, enlarged cutting head and tip is adapted to maintain a penetration angle through a plurality of spaced wooden objects while being rotatably driven by a drill. The tip of the drill bit forms a portion of a cutting head and is of generally triangular shape having two relatively enlarged opposed flat surfaces joined by two tapered surfaces. The tapered surfaces intersect at a tip edge defined by a line which makes an acute angle with a plane bisecting said drill bit along the longitudinal axis thereof, and which plane is perpendicular to the flat surfaces.

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patent: 4093395 (1978-06-01), Luebbert
patent: 4157714 (1979-06-01), Foltz et al.

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