Drill screw and cutters for making same

Details Drill screw and cutters for making same Drill screw and cutters for making same

F - Mech Eng,Light,Heat,Weapons

16

B

85/107, 10/4

F16B 25/00 (2006.01) B23C 5/14 (2006.01) F16B 25/10 (2006.01)

Patent

CA 1175688

DRILL SCREW AND CUTTERS FOR MAKING SAME ABSTRACT OF THE DISCLOSURE Disclosed is a self-drilling fastener having a fastener shank t which has an axis and an outer edge. The fastener further has a drilling tip at one end of the fastener shank, the tip comprising a pair of flutes extending at equal opposite angles with respect to the axis of the fastener lying generally on opposite sides thereof. A pair of heel portions extend intermediate the flutes, the pair of heel portions intersecting to define a narrow chisel point. Each of the pair of flutes defines a cutting edge and a drag surface, portions of the tip between the pair of flutes and axially inwardly of the heel portions are configured in substantially immediately increasing cross-sections in planes through the portions parallel to the axis of the fastener as distance along the planes from the respective heel portions increases thereby buttressing the cutting edges and enhancing resistance of the tip to breaking during drilling. Each of the pair of flutes has a compound configuration formed by a straight section extending inwardly from the outer edge of the shank and including at least a portion of one of the cutting edges and a curved section including at least one of the drag surfaces. The curved section has a substantially uniform radius of curvature in a plane perpendicular to the axis of one of the pair of flutes.

363978

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