Drain hole core for explosion-proof drain seal fittings

Details Drain hole core for explosion-proof drain seal fittings Drain hole core for explosion-proof drain seal fittings

1992-01-17

1993-09-07

Picard, Leo P.

Electricity: conductors and insulators

Boxes and housings

Hermetic sealed envelope type

174 521, 174 523, 264273, H05K 506

Patent

active

052431320

ABSTRACT:
The drain hole core for a drain seal fitting includes an elongated elastomeric member having a handle on one end, a rod-like member on the other end, and a integral plug between the handle and rod-like member. The drain hole core is inserted into the drain opening of the drain seal fitting such that the rod-like member extends up into the bore extending through the drain seal fitting and the plug seals the drain opening. A dam seals that area between the electrical wiring and the internal circumferential wall of the lower portion of the drain seal fitting. A sealing compound is then poured into an access opening in the side of the drain seal fitting so as to seal the bore of the drain seal fitting and to cover a portion of the rod-like member. Once the rod-like member is removed, it acts as a mold and provides a drain path from that portion of the bore above the sealing compound to the drain opening. The drain opening is then closed with a drain fitting. Upon the accumulation of water above the sealing compound, the accumulated water passes through the drain path and out the drain fitting.

REFERENCES:
patent: 3325584 (1967-06-01), Herzig
patent: 3735078 (1973-05-01), Appleton et al.
patent: 4213018 (1980-07-01), Piston
patent: 4246696 (1981-01-01), Bauer et al.
patent: 4281943 (1981-08-01), Viennot
patent: 4355200 (1982-10-01), Wheeler et al.
patent: 4791247 (1988-12-01), Cacalloro et al.
patent: 4846163 (1989-07-01), Bannister, Jr. et al.
patent: 5123627 (1992-06-01), Hodges
Appleton Electric Company, "NEC Sec. 501-5 Highlights on Sealing Fitting Requirements", Jul. 1, 1988, (4 pp.).
O-Z/Gedney, "Hazardous Location Drain/Seal Fittings", 1986 (p. B25).
Crouse-Hinds, "Drains and Breathers", Oct. 1983, (1 p.).
Crouse-Hinds, "Condulet Sealing Fittings with Drains", Oct. 1983, (2 pp.).
Crouse-Hinds, "Installation Instructions for Conduit Sealing in Hazardous Locations", 1987, (2 pp.).

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