Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Including settable material – Adhesive encapsulated
Patent
1990-06-21
1992-09-01
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Including settable material
Adhesive encapsulated
411311, 411412, 411930, F16B 3902, F16B 3930
Patent
active
051434989
ABSTRACT:
The invention herein is a roofing fastening device, with an optional liquid sealer to facilitate the process of affixing rectangularly-shaped sheets or rubber roofing material to the upper surface of a roof. Specifically, the invention is a longitudinally disposed fastening member in the general form of a screw or like member which is adapted to be inserted through the upper surface of the rubber roofing sheets and thence through the upper surface of the roof structure, serving thereby to anchor the rubber roofing sheets to the fixed roof structure. The fastening device has a longitudinally extending centrally located chamber which is coaxially aligned with the longitudinal central axis of the fastening member, and this chamber has a plurality of laterally disposed openings which extend from the chamber to the outer surface of the fastening member, said chamber being adapted to receive a liquid sealant at an opening in the upper surface and disperse same through such lateral openings. The exterior surface of the screw shaft is formed with screw threads having a dual set of helically-wound threaded members. The external, most radially outer portions of the threads are grooved with seriated teeth to enhance the holding power of the fastening member.
REFERENCES:
patent: 408531 (1889-08-01), Rogers
patent: 2096937 (1937-10-01), McManus
patent: 3942405 (1976-03-01), Wagner
IBM Technical Disclosure Bulletin to "Self-Locking Screw", vol. 4, No. 9, Feb. 1962.
Royer George R.
Wilson Neill R.
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