Patent ID: 8939692
Filing Date: 2015-01-27
Classification: F16B,Y10T

Abstract:
1. A hole-forming and thread-forming screw, having a screw head ( 1 ), which exhibits a screw driving arrangement, a screw shank ( 4 ), which exhibits a cylindrical section of thread having a retaining section ( 14 ) starting from the head of the screw and an adjoining tapping section ( 15 ), and a partially thread-free forming section ( 7 ) extending as far as a front end ( 8 ) of the screw, of which the cross section reduces continuously in the direction of the front end ( 8 ) of the screw, such that the front end ( 8 ) of the screw is rounded and configured to enlarge a pilot hole to form a raised rim hole, whereby the core cross section of the threaded section of the shank ( 4 ) of the screw exhibits, at least within the tapping section ( 15 ), the form of a polygon, especially a triangle, having rounded corners and convex sides.