Explosion Proof Housing Cover Seal

Abstract

The inventions is an explosion proof housing cover seal. The cover seal includes a housing and a cover, where the housing has an interior and an opening into the interior defined by a housing sidewall. The housing sidewall have a threaded portion. The cover has a sidewall with a cover threaded portion that mates with the housing sidewall threaded portion. The cover sidewall includes a circumferential cover bevel portion, and the housing sidewall has a matching circumferential housing bevel portion, where the two bevel portions contact circumferentially when the cover is sealingly engaged with the housing opening. The explosion proof housing cover seal further has a seal channel to contain a seal member. Each of the bevel portions has a proximal end, and the bevel proximal ends are positioned adjacent to the seal channel when the cover is sealingly engaged with the housing opening.

1 . 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 have a threaded portion, said cover having a cover sidewall having a cover threaded portion adapted to mate with said housing sidewall threaded portion,
 said cover sidewall having a circumferential cover first bevel portion, where said bevel of said cover first bevel portion is not 90 degrees, as measured from the vertical;   said housing sidewall having a circumferential housing first bevel portion,   said first bevel portions adapted to contact substantially circumferentially when said cover is sealingly engaged with said housing opening,   said explosion proof housing cover seal further having a seal channel adapted to contain a seal member, where each said first bevel portion has a proximal end, said proximal ends being positioned adjacent to said seal channel when said cover is sealingly engaged with said housing opening.   
   
   
       2 . The explosion proof housing cover seal of  claim 1  wherein said seal channel is positioned on said cover sidewall. 
   
   
       3 . The explosion proof housing seal of  claim 1  wherein said seal channel is positioned on said housing opening sidewall. 
   
   
       4 . The explosion proof housing seal of  claim 1  wherein the bevel of said cover first bevel portion is in the range of 25 to 155 degrees from vertical. 
   
   
       5 . The explosion proof housing seal of  claim 4  wherein the bevel of said cover first bevel portion is about 45 degrees from vertical or about 135 degrees from vertical. 
   
   
       6 . The explosion proof housing seal of  claim 1  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 less 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 180 degrees but greater than 90 degrees. 
   
   
       7 . 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.   
   
   
       8 . 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.   
   
   
       9 . 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.