Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Impact driven fastener – e.g. – nail – spike – tack – etc. – Including integral locking means
Patent
1984-08-23
1989-05-09
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Impact driven fastener, e.g., nail, spike, tack, etc.
Including integral locking means
411446, 405259, F16B 1500, F16B 1508
Patent
active
048284459
ABSTRACT:
A one-piece wall anchor capable of being driven axially into a hole drilled in masonry to cause the inserted anchor to lodge securely therein to hold a fixture or other part against the masonry surface. The anchor is constituted by a shank formed of resilient material whose memory is such that when the shank is forcibly deformed, it seeks to maintain its original shape, the shank being integral with a drivable head and having a maximum cross section which is substantially equal to the diameter of the hole. The shank is pre-shaped to include at least one undulation which deviates from the longitudinal axis passing through the head to create a shank bend having a peak on one side of the shank and upper and lower bases on the other side thereof. When, therefore, the anchor is driven into the masonry hole, this force seeks to straighten out the bend, the resultant deformation thereof exerting outward pressures against large contact areas on the wall of the hole at the peak and at the bases of the bend, which multi-level pressures strongly resist axial withdrawal of the shank.
REFERENCES:
patent: 372844 (1887-11-01), Emerson et al.
patent: 1466676 (1923-09-01), Stronach et al.
patent: 2256401 (1941-09-01), Maze
patent: 2690693 (1954-10-01), Campbell
patent: 3391720 (1968-07-01), Morse
patent: 3495494 (1970-02-01), Scott
patent: 3791750 (1974-02-01), Cameron
patent: 4342982 (1982-08-01), Plasko
Ebert Michael
Wilson Neill R.
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