Fastening assembly for roofs of soft material
AssigneeIllinois Tool Works Inc.
InventorsWilliam J. Blucher, Richard J. Ernst, Francis C. Peterson
Life of this patent
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Abstract
A fastening assembly for use in attaching articles to soft materials such as gypsum based and light weight concrete roofing. The assembly includes an anchoring element which has a high thread and an axial bore in one end. The thread has an included angle of less than 45.degree. and terminates in a sharp edge at the free end of the anchoring element. A headed screw is driven into the bore and becomes fixed to the anchoring element. A flange is integrally molded and frangibly connected to the bored end of the anchoring element, and becomes a washer upon breaking away therefrom.
Claims3
An anchoring element comprising a generally cylindrical body having a thread thereon defining a crest diameter and a root diameter, said crest diameter being generally twice as large as said root diameter, and a bore in one end of said body adapted to receive a screw therein, said body including an integrally molded flange at one end thereof, said bore including three sections of differing diameters, a first of said three sections adapted to receive a screw head, a second section of lesser diameter than said first section, and a third section of lesser diameter than said second section.
Dependencies are inferred from the claim text.