Receptacles – Outlet or junction box type
Patent
1975-10-20
1977-02-15
Price, William
Receptacles
Outlet or junction box type
220266, H02G 312
Patent
active
040078523
ABSTRACT:
Knockout window means include a knockout port formed primarily in a sidewall of an electrical assembly box and a knock-out panel superposed over the knockout port from the inside of the sidewall. The knockout panel is attached only at its front and back ends to the box, the front end being connected to the inside surface of the sidewall and the back end being connected to the backwall, each by a frangible web which provides doubly accessible panel removal slot means between each end of the knock-out panel and the structure to which each is attached. The panel removal slot means are accessible from both the outside and the inside of the assembly box at each end of the knockout panel, and include four pairs of bearing surfaces against which a wedge-like tool may bear for applying twisting leverage to fracture the webs. Abutment means may be formed on the inside surface of the backwall, and the frangible web thereat may be formed generally continuous with the inside of the backwall to provide panel removal slot means of relatively enlarged depth at back end of the knockout panel. The electrical assembly box, knockout panels and frangible webs may be integrally molded in a unitary structure.
REFERENCES:
patent: 2959633 (1960-11-01), Palmer et al.
patent: 3438534 (1969-04-01), Zerwes
patent: 3770873 (1973-11-01), Brown
patent: 3773968 (1973-11-01), Copp
patent: 3863021 (1975-01-01), Schindler et al.
patent: 3873759 (1975-03-01), Schindler et al.
patent: 3895732 (1975-07-01), Robinson et al.
patent: 3917101 (1975-11-01), Ware
patent: 3926330 (1975-12-01), Deming et al.
Marcus Stephen
Price William
Slater Electric Inc.
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