Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Impact driven fastener – e.g. – nail – spike – tack – etc. – Including integral locking means
Patent
1993-12-08
1996-02-06
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, 411456, F16B 1500, F16B 1508
Patent
active
054891787
ABSTRACT:
An anchor bolt is provided having a shank which is retained within a recess via peak to peak reaction forces rather than a plurality of peak to base arrangements. This is accomplished through the use of one or more continuous "S" bends or undulations intermediate the shank ends. The "S" bends each create two peaks which extend outwardly from the shank surface with a continuous curve therebetween. That curve includes an inflection point, preferably on the longitudinal axis of the shank, but the slope of the curve at the inflection point is not parallel to that longitudinal axis. Thus, when the shank is inserted within the recess compressive pressure applied to one such peak is directly opposed by such forces applied to the other peak. These peaks can be disposed on opposite sides of the shank or, for example, disposed in a helical or other such pattern about three or more sides of the shank. Serration and/or an abrasive surface can also be provided on the shank to increase retention.
REFERENCES:
patent: 372844 (1887-11-01), Emerson et al.
patent: 1574790 (1926-03-01), Carroll
patent: 4828445 (1989-05-01), Giannuzzi
patent: 4936062 (1990-10-01), Giannuzzi
patent: 5035559 (1991-07-01), Nilsen
patent: 5069588 (1991-12-01), Hasan et al.
patent: 5265998 (1993-11-01), Kluser
Reported Court Decision, 23 U.S.P.Q. 2d 1054 (S.D.N.Y. 1992).
Fountain Ryan M.
Wilson Neill R.
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