F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/107
F16B 25/00 (2006.01)
Patent
CA 1063397
ABSTRACT OF THE DISCLOSURE SELF-DRILLING SCREW Disclosed is a self-drilling screw including an elongated shank, and an enlarged head at one end with means cooperable with a tool for turning the screw, the elongated shank including a threaded portion intermediate the enlarged head and an entering end portion of the shank. A drill tip is formed on the entering end portion and includes a pair of oppositely disposed, generally longitudinally directed flute means extending upwardly from and intersecting a pair of flat bevel surfaces formed on either side of a terminal ridge edge which intersects and is substantially perpendicular to the longitudinal axis of the shank. Each of the flute means comprises first and second intersecting, substantially longitudinally extending surfaces, the surfaces intersecting both of the bevel surfaces with the major lateral extent of the first surface extending at an angle not greater than 45° to the terminal ridge edge and thereby forming laterally extending cutting edges. The first surfaces comprise a pair of intersecting flat surfaces linear in both longitudinal and lateral directions and both of the pair of intersecting flat surfaces are inclined to the longitudinal axis of the fastener with the lowermost of the surfaces being inclined to a lesser amount than the uppermost of the surfaces. The second surfaces comprises a pair of intersecting surfaces, arcuate in the longitudinal direction with the intersection of the arcuate surfaces forming an upstanding ridge spaced axially from the cutting edges and extending generally laterally to the longitudinal axis. The first and second surfaces are disposed at from 92° to 97° to one another to insure proper relief behind the laterally extending cutting edges.
325340
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