Method and apparatus for providing an environmental barrier...

Electricity: conductors and insulators – Boxes and housings

Reexamination Certificate

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Details

C174S058000, C174S068300, C174S060000, C220S003200, C220S003800, C439S535000

Reexamination Certificate

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06940012

ABSTRACT:
An electrical fixture is disclosed that has an electrical enclosure, a knockout plug coupled to the electrical enclosure with an interference fit, and a seal coupled to a circumference of the knockout plug between the knockout plug and electrical enclosure so that the seal provides an environmental barrier between an interior and exterior of the electrical enclosure.A method is also disclosed for providing an environmental barrier for a tapered-threaded knockout of an electrical enclosure including placing a seal on a knockout plug and pressing the knockout plug into the tapered-threaded knockout to establish an interference fit between the knockout plug and tapered-threaded knockout. The knockout plug is detachably coupled to the tapered-threaded knockout, with the seal providing an environmental barrier between interior and exterior portions of the electrical enclosure.

REFERENCES:
patent: 2527908 (1950-10-01), Blitz
patent: 3787606 (1974-01-01), Schaeffer
patent: 3927249 (1975-12-01), Pearse
patent: 4051322 (1977-09-01), Park et al.
patent: 5147979 (1992-09-01), Yang
patent: 5920035 (1999-07-01), Haney et al.
patent: 6180882 (2001-01-01), Dinh
patent: 6323433 (2001-11-01), Mahaney et al.
patent: 6733345 (2004-05-01), Weise et al.
patent: 514861 (1992-11-01), None
Product Datasheet for Part No. 5320-0 From Catalog, pp. 1-2, Single Gang Weatherproof Box 3 ½ Outlets, Hubbell Electrical Products.

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