F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/106
F16B 25/00 (2006.01) F16B 25/10 (2006.01)
Patent
CA 1053040
ABSTRACT OF THE DISCLOSURE An improved thread-forming sheet screw is provided. It includes a screw head and a threaded shank formed of a blank by rolling and connected at its top to the screw head. A substantially pyramidal end extends integrally from a bottom of the threaded shank to terminate in a point with a maximum diameter of such pyramidal end being not larger than a blank diameter of the blank. The pyramidal end has a tip portion disposed adjacent the point, and a base portion disposed between the tip portion and the bottom of the threaded shank, the tip portion being of a substantially regular polygon in cross section having at least five edges and at least five flat sides extending divergently from the point to the base portion. The base portion is of a substantially regular polygon in cross section having at least three sides and at least three rounded ridges with curved outer surface with each of the sides of the base portion being connected with a pair of adjacent rounded ridges of the base portion so as to provide a smoothly continuous contour line, the tip portion being provided with more sides than the base portion. The curved outer surface of each of the rounded ridges becomes wider as it approaches the bottom of the threaded shank thereby producing a curvature of the curved outer surface varying so as to be progressively increasing in radium toward the bottom of the threaded shank. This provides a self-tapping screw which enables the formation of a protrusion of the desired height without the development of undesirable splits or cracks around the aperture.
263304
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