Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1980-05-05
1982-07-13
Britts, Ramon S.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
F16B 2500
Patent
active
043392180
ABSTRACT:
A fastener for use in soft materials, such as wood, dry wall, and the like, is provided with a shank having a conical void and longitudinal slots in the leading end thereof, forming flexible fingers which bottom in a hole formed in the material to be fastened and flare radially outwardly as material is trapped in the void as the fastener is advanced. In a second embodiment, a shank having a longitudinal slot extending substantially the full length of the shank defines fingers which flare outward as the fastener advances in softer materials. Means for resisting removal of the fastener are provided formed on the fingers.
REFERENCES:
patent: 1729670 (1929-10-01), Holland
patent: 2017550 (1935-10-01), Scherer
patent: 2292195 (1942-08-01), Brown
Britts Ramon S.
Matthews Guy E.
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