Screwcon

Abstract

A self-drilling and self-tapping anchoring screw for attachment to a concrete substrate formed from hardened steel or the like suitable material, and having a threaded proximal portion including a radially enlarged head and a coaxial distal portion, forming a concrete drill bit having a fluted shank and a concrete drill bit tip, said threaded proximal portion including a double lead, spaced thread configuration including a first thread helix of a given height and a second thread helix of a smaller height than said first thread helix; said first and second thread helix defining a space therebetween which serves as a reservoir to receive dust that is produced during the tapping operation and wherein said fluted shank functions to eject any particulates created during a drilling operation thereby enabling the threaded proximal portion to form an effective threaded connection with the concrete substrate during said tapping operation.

Dependencies are inferred from the claim text.