Self-cutting fast construction screw
AssigneeRichter System GmbH & Co. KG
InventorHorst Brandt
Life of this patent
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Abstract
A self-cutting fast construction screw for the fastening of fiber plates to a metal substructure carries on the screw shaft at least one turn of a thread. The screw core passes into a conical drill point. On the conical drill point two cutting edges are arranged in a symmetrical layout, said cutting edges cutting to a diameter located between the diameter of the screw core and the diameter of the outer thread tip. Upon impact on the metal substructure, the two cutting edges break off.
Claims5
A self-cutting construction screw for fastening a fiber plate to a metal substructure, said screw comprising a head, a screw shaft extending from said head and carrying at least one helical thread which terminates on said shaft, a conical drill point extending from an end of said shaft situated opposite said head, said drill point converging in a direction away from said head, and two outwardly projecting frangible cutting edges mounted on said conical drill point for cutting through the fiber plate and breaking off upon impact with the metal substructure, said cutting edges sized to cut to a diameter located between the diameter of the thread core and the outer diameter of the thread.
Dependencies are inferred from the claim text.