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
1992-07-13
1993-02-23
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, 411411, 411426, F16B 2500, F16B 3930
Patent
active
051884968
ABSTRACT:
A self-tapping screw-type masonry anchor which when turned into a hole drilled in a masonry structure to secure an object thereto is then highly resistant to pull-out forces. The anchor is fabricated of a metal whose hardness is such that when it rubs against a masonry surface it is abraded and worn thereby. The anchor 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 have diameters greater than that of the hole which decrease progressively from the leading to the trailing end to create a reverse taper. When the anchor is rotated to cause it to enter the hole and tap its wall, the sharp crest at the leading end of the cutting thread experiences a high degree of wear and blunting, the degree of crest wear diminishing progressively toward the trailing end to effectively erase the taper and produce a male thread in the shank of substantially uniform diameter and a mating female internal thread in the wall of the hole, this relationship resulting in high resistance to loosening of the anchor.
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
Ebert Michael
Wilson Neill R.
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