One piece knock-out plug

Details One piece knock-out plug One piece knock-out plug

1975-04-30

1976-11-16

Griffin, Donald A.

Buckles, buttons, clasps, etc.

Trouser guards, clips, straps

16 2, 174153G, F16C 110, H01B 1726, B65D 1126

Patent

active

039914461

ABSTRACT:
A closure or bushing member for openings in electrical boxes, conduit ends and the like is formed as an integral unit of a thermoplastic synthetic organic polymeric resin and includes a disc or annular shaped head and a coaxial hollow cylindrical shank of lesser diameter. Extending from opposite sides of the distal end of the shank are a pair of opposite radially projecting arms, which terminate in wing members of greater width than the radial arms and which have conically surfaced outer faces flaring rearwardly outwardly. A peripheral recess is formed in the rear outer face of each wing to provide a rearwardly facing shoulder for resiliently engaging the inside border of the opening to which the closure member is applied to retain the closure member therein.

REFERENCES:
patent: 2424757 (1947-07-01), Klumpp
patent: 3373463 (1968-03-01), Wells
patent: 3397280 (1968-08-01), Klumpp
patent: 3506999 (1970-04-01), Neher
patent: 3631738 (1972-01-01), Harper
patent: 3869958 (1975-03-01), Murayama

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