Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Impact driven fastener – e.g. – nail – spike – tack – etc. – Multiple prong – e.g. – nailing plate – staple – etc.
Patent
1989-09-21
1990-09-11
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Impact driven fastener, e.g., nail, spike, tack, etc.
Multiple prong, e.g., nailing plate, staple, etc.
411469, 411473, 411923, F16B 1500
Patent
active
049558137
ABSTRACT:
A multi-pronged thumbtack which includes a head and a plurality of tines projecting from the head in the same direction to assure that paper impaled upon the tines will not be able to rotate around the axis of any one of the tines. In general, the head has at least one monoplanar side from which the tines extend codirectionally, and three tines are preferably disposed at the corners of an equilateral triangle.
REFERENCES:
patent: 1991561 (1935-02-01), Krantz
patent: 3205757 (1965-09-01), Kuennen
patent: 4525115 (1985-06-01), Garner, Sr.
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