Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Pilot end having means enhancing fastening or installation
Patent
1993-02-05
1994-02-01
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Pilot end having means enhancing fastening or installation
411310, 411426, F16B 2500, F16B 3930
Patent
active
052827089
ABSTRACT:
A self-tapping, screw-type masonry anchor which can readily be turned into a hole drilled in a masonry structure to secure an object thereto, the installed anchor being highly resistant to pull-out forces. The anchor, which is fabricated of hard metal, includes a head engageable by a torque-producing tool to rotate the anchor, and a shank extending therefrom provided with a root section surrounded by a helical male cutting thread whose series of convolutions have sharp crests and extend from the leading to the trailing end of the root section. The crests of the male thread diameters are greater than that of the hole and decrease progressively from the leading to the trailing end to create a reverse taper. When the anchor is screwed into the drilled hole to tap its wall, the large diameter crest at the leading end of the male thread cuts an internal female thread in the wall having convolutions of substantially uniform diameter which intermesh with the reverse-taper convolutions of the male thread.
REFERENCES:
patent: 3351115 (1967-11-01), Boehlow
patent: 3937119 (1976-02-01), Ernst
patent: 4439077 (1984-03-01), Godsted
patent: 4842467 (1989-06-01), Armstrong
patent: 5044853 (1991-09-01), Dicke
patent: 5188496 (1993-02-01), Giannuzzi
Ebert Michael
Wilson Neill R.
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