Explosion Proof Housing Cover Seal

An explosion proof housing cover seal comprising a housing and a cover, said housing having an interior and an opening into said interior defined by a housing sidewall, said housing sidewall having a threaded portion positioned on said housing sidewall interior surface, said housing sidewall having a top edge, said top edged having a sidewall first beveled portion where said bevel portion begins on said housing sidewall interior surface;

• a cover, said cover having a top portion, and a cover sidewall extending from said top portion, said cover sidewall's exterior surface having threads thereon for mating with said housing sidewall threads, said cover having a seal channel positioned between said cover sidewall threads and said cover top, said cover having a cover first bevel portion adapted to mate with said sidewall tope edge bevel portion when said cover is sealingly engaged with said housing opening, said cover first bevel portion beginning on said cover sidewall exterior surface and positioned between said cover top portion and said seal channel.

An explosion proof housing cover seal comprising a housing and a cover, said housing having an interior and an opening into said interior defined by an upstanding housing sidewall, said housing sidewall having a threaded portion positioned on said housing sidewall's exterior surface, said housing sidewall having a sidewall first bevel portion positioned on said housing sidewall's exterior portion, said housing sidewall having a seal channel positioned between said housing sidewall first bevel portion and said housing sidewall threaded portion;

• a cover, said cover having a top portion, and a cover sidewall extending from said top portion, said cover sidewall's interior surface having threads thereon for mating with said housing sidewall threads, said cover having a cover first bevel portion beginning on said cover sidewall's interior surface, said cover first bevel portion adapted to mate with said housing sidewall first bevel portion when said cover is sealingly engaged with said housing opening.

The explosion proof housing seal of claim I wherein said cover includes a circumferential cover second portion and said housing includes a circumferential housing second bevel portions, said second bevel portions adapted to contact substantially circumferentially when said cover is sealingly engaged with said housing opening, and wherein the bevel of said cover first bevel portion is greater than 90 degrees and the sum of the bevel of the first portion plus the angle between said first cover bevel portion and said second cover bevel portion is less than 270 degrees but greater than 180 degrees.