Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having structure to restrict rotation of threaded – mating... – With a member in the nature of a rotation preventing key...
Patent
1983-10-19
1985-11-19
Holko, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having structure to restrict rotation of threaded, mating...
With a member in the nature of a rotation preventing key...
411347, 411411, F16B 2100, F16B 3938
Patent
active
045538905
ABSTRACT:
The captive screw has an enlarged head to prevent complete passage of the screw through a bore in a panel. The shank of the screw has a side opening incorporating a retractable latch radially extending from the shank. This latch has upper and lower sloping cam surfaces at its forward end. The lower surface is oriented such that urging of the screw inwardly through the bore in the panel retracts the latch. The latch is spring-biased radially outwardly so that after the latch clears the bore, the screw is held captive. The upper cam surface of the latch intercepts the lower cam surface in a line which is tilted at an angle corresponding to the helix angle of the threads in a nut receiving the screw in an adjacent panel. The screw can thus be threaded into this nut to close the panel and the latch will function as a thread lock. In addition, should the nut be shallow, so that the screw extends out the other end to a point where the latch is free to pop out, the screw can still be removed by applying sufficient unthreading force that the latch is biased inwardly by its upper sloping cam surface and the fact that this cam surface end is at a tilted angle corresponding to the helix angle of the nut threads.
REFERENCES:
patent: 579553 (1897-03-01), Bassford
patent: 841025 (1907-01-01), LeSueur
patent: 1639211 (1927-08-01), Campo
patent: 2361491 (1944-10-01), Nagin
patent: 2426099 (1947-08-01), Hershowitz
patent: 3097559 (1963-07-01), Chapman
patent: 3361176 (1968-01-01), Jansen
patent: 3561516 (1971-02-01), Reddy
patent: 4285380 (1981-08-01), Gulistan
patent: 4358941 (1982-11-01), Zimmer
Holko Thomas J.
Kelly John E.
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