F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/107
F16B 25/00 (2006.01) F16B 25/10 (2006.01)
Patent
CA 1217368
ABSTRACT A drilling and thread forming fastener comprising a trailing threaded shank and a pilot end having a trans- verse major axis and a transverse minor axis. A pair of flutes extend longitudinally in the pilot end whereby to provide a pair of cutting surfaces. Each of the cutting surfaces is formed arcuately in the longitudinal direction to provide proper rake for drilling the flutes being oriented such that the cutting surfaces lie generally along the plane defined by the major axis of the pilot end and are coterminal with the major axis whereby cutting edges associated with the cutting surfaces describe a circle having a greater diameter than the minor axis when the fastener is rotated. Drag surfaces are formed by the flutes lying generally along the minor axis and coterminal there- with. Lands are provided intermediate the drag and cutting surfaces of increasing width in a radial direction from the drag surface to the cutting surfaces whereby the lands will not engage the sidewall of a pilot hole formed by the cutting surfaces. The improvement resides in that the drag surface is formed arcuately in the longitudinal direction of the fastener in substantially the same arcuate configuration as a said cutting surface to provide clearance for chips of material produced during the drilling process. The arcuate surface has substantially a constant radius throughout its length and extends from a point adjacent the tip of the pilot end to a point adjacent the threaded shank and is formed at an angle with respect to the cutting surfaces to provide a smooth flow of material through the flutes.
420183
Corporation Usm
Newfrey Llc
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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