Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having structure to restrict rotation of threaded – mating... – Structure is coaxial – distinct member that restricts nut piece
Patent
1987-12-11
1989-03-14
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having structure to restrict rotation of threaded, mating...
Structure is coaxial, distinct member that restricts nut piece
411433, 29446, 295251, 52227, F16B 3912, E04C 310
Patent
active
048120960
ABSTRACT:
A fastener device for automatically maintaining a tightening torque on a threaded structural member under stress which would otherwise become loose when the stress is reduced. The device comprises a first nut member, a second nut member axially aligned with the first nut member and a coiled spring connected at its opposite ends between the first and second nut members. When the nut members are threaded to the first and second nut members and the second nut member is turned and held, as by a stop means, torsional energy is stored in the spring and later becomes available to automatically turn and tighten the first nut member, wherever it becomes loose.
REFERENCES:
patent: 518165 (1894-04-01), Thalaker
patent: 560554 (1896-05-01), Wiestner
patent: 581551 (1897-04-01), Green
patent: 1205256 (1916-11-01), Pearson
patent: 4479747 (1984-10-01), Pagel
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