Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1998-11-02
1999-09-28
Wilson, Neill
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
411311, 411414, F16B 3504, F16B 3930
Patent
active
059576464
ABSTRACT:
An enhanced strength screw-type, self-tapping masonry anchor for fastening a fixture or other attachment to masonry in which a hole is drilled to receive the anchor. The anchor is provided with a shank having a root section surrounded by at least one helical male cutting thread whose crest diameter exceeds the diameter of the hole whereby when the anchor is screwed into the hole, the cutting thread then cuts a female thread in the bank of the hole to mechanically retain the anchor therein to impart to the anchor a holding power that resists axial pull-out forces. Formed on the root in the helical land between successive convolutions of the thread is a ridge that is raised above the root to define a compacting zone between the ridge and the bank of the hole. Particulate debris produced by the cutting action is discharged into the land and forced into the compacting zone to create a dense mass that wedges the anchor in the hole and thereby enhances the holding power of the anchor.
REFERENCES:
patent: 410697 (1889-09-01), Rogers
patent: 4329099 (1982-05-01), Shimizu et al.
patent: 4439077 (1984-03-01), Godsted
patent: 4652194 (1987-03-01), Tajima
patent: 5061136 (1991-10-01), Dixon et al.
patent: 5531553 (1996-07-01), Bickford
Giannuzzi Anthony C.
Giannuzzi Louis N.
Ebert Michael
Giannuzzi Anthony C.
Wilson Neill
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