Eccentric knockouts for metal boxes

Details Eccentric knockouts for metal boxes Eccentric knockouts for metal boxes

1985-11-21

1987-02-03

Hall, George T.

Receptacles

Closures

With closure opening arrangements for means

B65D 4132, B65D 1732

Patent

active

046404333

ABSTRACT:
A knockout structure is provided for selectively forming openings for either one of two different sizes of conduit. The center of the inner knockout is offset from the center of the outer knockout, creating an eccentric relationship which permits a positive ground to be established between the smaller conduit and the box wall by a standard lock washer when the smaller conduit is mounted therein. A secure mechanical connection is similarly established.

REFERENCES:
patent: 1805003 (1931-05-01), Newman
patent: 2154310 (1936-01-01), Kinnard
patent: 2663454 (1953-12-01), Olson
patent: 2850916 (1954-06-01), Kingdon
patent: 3333501 (1965-09-01), Pitcher
patent: 3587906 (1969-04-01), Pepe
patent: 3877601 (1975-04-01), Evans et al.
Photographs of Square D Panel Knockouts.

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