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
1984-03-16
1986-07-29
Smith, Gary L.
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
411226, 411427, 411432, 411911, F16B 3912
Patent
active
046029036
ABSTRACT:
An anti-theft nut for forward threading on a threaded member and having removal preventing means. The nut has a nut case with an axially extending skirt and two axially extending blind bores, and a bottom nut attached to the skirt to define and inner cavity. Two roll pins of different lengths are assembled within the axially extending bores. An internal nut having an engagement shoulder for engagment by the roll pins, and a bearing disposed between the internal nut and the bottom nut are assembled within the nut cavity. The longer of the roll pins extends from its bore in the nut case to engage the shoulder of the internal nut to effect the forward threading of the anti-theft nut. Unthreading of the anti-theft nut is prevented due to jamming between the bottom nut, through the bearing, with the internal nut prior to possible engagement of the longer roll pin with the opposite side of the shoulder of the internal nut. Unthreading may be effected by locating the shorter roll pin and penetrating the nut case to release the shorter pin from its bore to allow engagement of the shoulder of the internal nut. A coded nut cover allows the location of the shorter roll pin to be determined.
REFERENCES:
patent: 541159 (1895-06-01), Fleischman
patent: 782079 (1905-02-01), Steele
patent: 1005727 (1911-10-01), Maurice
patent: 1216954 (1917-02-01), Crowley
patent: 1349491 (1920-08-01), Burton
patent: 1516453 (1924-11-01), Nichols
patent: 2375325 (1945-05-01), Robertson
patent: 3267792 (1966-08-01), Yackle
patent: 4144796 (1979-03-01), Richter et al.
Lindsey Rodney M.
Matthews Guy E.
Smith Gary L.
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