F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/89
F16B 23/00 (2006.01)
Patent
CA 1237304
ABSTRACT The invention is concerned with a screw-type fastener having a threaded shank and a head integral therewith, and adapted to be driven into a structure by axial rotation about its longitudinal central axis in a driving direction such that the head is countersunk. The head has a circular peripheral edge and is formed with at least two ribs of substantially rectangular cross-section protruding from the surface of the head thereof and extending radially outward from the central axis to terminate flush with the peripheral edge while maintaining the cross-section constant. The ribs define a corresponding number of sector-shaped cavities adapted to receive a filler material for engaging the ribs so as to prevent the fastener from axially rotating in a direction opposite the driving direction and to thereby secure the fastener against loosening. Each rib projects from the surface of the head a distance equal to at least one-half the thickness of the head so as to define on either side a filler material abutting wall with each sector-shaped cavity having a depth such as to receive sufficient filler material to immobilize the ribs.
448015
Ogilvy Renault
Visinand Jean-Claude
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