Captive fastener

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Member preassembled with substructure at through-passage or...

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Details

411112, 411353, F16B 2118

Patent

active

049750070

ABSTRACT:
A captive screw is provided which has a head and a threaded shank with grooves extending inwardly from the outer end of the shank, with a washer extending around the shank and provided with tabs extending into the grooves. A bore is provided in the outer end of the shank and formed with an undercut portion of enlarged diameter. A plug having a straight knurl on a shank is pressed into the bore to retain the plug to the shank, becoming embedded in the shank at either end of the enlarged portion. A head on the plug engages the outer end of the shank and interferes with the tab to hold the washer to the shank. The plug may have an annular groove for engagement by a removal tool.

REFERENCES:
patent: 3995675 (1976-12-01), Cosenza
patent: 4655658 (1987-04-01), Guistan
patent: 4723881 (1988-02-01), Duran
patent: 4735536 (1988-04-01), Duran

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