Self-locking two-part grommet

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Lap bolt or fastener

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Details

411508, 411908, 411913, 295251, F16B 1900, F16B 2100

Patent

active

050695860

ABSTRACT:
A grommet has a female member and a male member. Each member consists of a sleeve with a flange formed at one end. The sleeve of the male member is slightly smaller than the bore of the sleeve of the female member. A locking mechanism for the grommet consists of an annular groove inscribed within the inner surface of the sleeve of the female member and a slightly-offset, matching annular lip formed upon the outer surface of the sleeve of the male member. The annular groove and annular lip are offset so that the two members remain in tension, pulling toward one another when the grommet is locked in place. The grommet is locked in place by inserting the male member into the female member and urging them together until the annular lip fits within the annular groove. The grommet may be disassembled by placing a dowel or like object against the non-flanged end of the male member and striking the male member or otherwise applying a force thereto. The flange of the male member and the flange of the female member may each have an annular indentation on their respective bottom surfaces that separates each bottom surface into an outer annular bottom surface and an inner annular bottom surface. This indentation allows each flange to flex slightly and creates a snug fit of the flanges against the side of a partition, wall or other surface through which the grommet has been placed.

REFERENCES:
patent: 1780555 (1930-11-01), Johnson
patent: 3678535 (1972-07-01), Charles
patent: 4557654 (1985-12-01), Masuda et al.
patent: 4761860 (1988-08-01), Krauss

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