Fastener with a modified thread form

Details Fastener with a modified thread form Fastener with a modified thread form

1980-06-23

1982-06-15

Britts, Ramon S.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Headed fastener element with nut, washer, securing means or cap

Headed bolt or screw with threads and complementary nut

411389, 411411, 411423, F16B 2500

Patent

active

043348157

ABSTRACT:
A fastener with a modified thread form discourages a nut from becoming irremovably frozen on the shank of a bolt. A first normal thread extends from a base reference surface to a height on the fastener shank to permit full thread engagement by a nut. Axially outwardly along the shank from that point, there is provided a second thread of reduced crest diameter but still of sufficient size to engage the threads on the nut. This reduction in thread diameter provides additional clearance to permit the nut to be backed off in spite of marred threads or paint or rust buildups.

REFERENCES:
patent: 658086 (1900-09-01), Higbee
patent: 1447056 (1923-02-01), Bates
patent: 2269476 (1942-01-01), Poupitch
patent: 3133578 (1946-05-01), Moskovitz
patent: 3207023 (1965-09-01), Knohl
patent: 3301299 (1967-01-01), Stanwick
patent: 3342234 (1967-09-01), Evans
patent: 3351115 (1967-11-01), Boehlow
patent: 3426820 (1969-02-01), Phiphard
patent: 3794092 (1974-02-01), Carlson et al.
patent: 3897713 (1975-08-01), Gugle
patent: 3907017 (1975-09-01), Stanwick
patent: 4040328 (1977-08-01), Muenchinger

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