Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Impact driven fastener – e.g. – nail – spike – tack – etc. – Of sheet metal
Patent
1981-12-18
1985-04-30
Perham, Alfred C.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Impact driven fastener, e.g., nail, spike, tack, etc.
Of sheet metal
52730, 206338, 206340, 206499, 411464, E04C 312, E04C 3292
Patent
active
045141266
ABSTRACT:
An improved corrugated staple or fastener for joining together wood members such as wood chords to form a joist-like wood beam. The staple, which is made of sheet metal, has corrugations oriented at three different angles relative to a reference line such as the edge of the staple which is to be inserted into the wood members. The corrugations which are oriented at the first and second angles pull the wood chord members toward each other and when the joist-like beam is subjected to loading, the orientation of the first and second corrugations compresses the wood chords toward each other and increases friction between the chords. The third corrugation is oriented so that when the staple is inserted into the wood chords, the fibers of the wood are temporarily displaced and thereafter move back toward their original position to resist any tendency of the staple to pull out of the chords. The third corrugation also increases the resistance of the staple to horizontal shear forces or bending.
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patent: 3762541 (1973-10-01), Hinden et al.
patent: 4221153 (1980-09-01), Medina
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