Fastener system and method

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having structure to restrict rotation of threaded – mating... – By deformation of a threaded element

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Details

411 1, 411 8, F16B 3922

Patent

active

046016236

ABSTRACT:
A fastener system is disclosed comprising a nut having an axial bore provided with interior thread and a bolt having exterior thread for engagement with the interior bore of the nut. The nut has an end portion having an elliptical cross section for engaging a complementarily shaped driver. As the nut is tightened onto the bolt against a workpiece, resistance to further threading increases. When sufficient resistance to threading occurs, the driver will deform the elliptically shaped end portions of the nut, forcing material of the nut radially inward toward the axis of the nut. The portion of the bolt which engages the nut has a plurality of recesses for receiving the deformed material of the nut as it flows radially inward, thereby locking the nut, bolt, and workpiece together. The recesses of the bolt have a shoulder for abutting the deformed material to prevent unthreading of the nut from the bolt.

REFERENCES:
patent: 445166 (1891-01-01), Elliot
patent: 495520 (1893-04-01), Sayre
patent: 930450 (1909-08-01), Zinow
patent: 1892119 (1932-12-01), Thompson
patent: 2923339 (1960-02-01), Skidmore
patent: 4005740 (1977-02-01), Villo
patent: 4176582 (1979-12-01), Witte
patent: 4260005 (1981-04-01), Stencel

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