Electrical apparatus for hazardous locations

Claim 2

An enclosure with electrical power control apparatus for hazardous locations comprising the combination of: an outwardly opening hollow base portion with a closed inner end adapted for mounting on a panel, having an annular flange about its outer end presenting an integrally formed rigid outwardly facing sealing surface; an inwardly opening hollow cover portion with a closed outer end having an annular flange about its inner end presenting an integrally formed rigid inwardly facing sealing surface abutting said outwardly facing sealiNg surface of said annular flange on said base portion; said cover portion and said base portion being assembled together with said outwardly facing sealing surface of said base portion in immediate abutting engagement with said outwardly facing sealing surface of said cover portion to form a seal to isolate from ambient atmosphere an enclosed hollow interior formed by said assembly of said cover portion and said base portion; a clamping ring surrounding said annular flanges and having diverging interior surfaces bearing against said flanges and urging said sealing surfaces into mating sealing relationship; and electrical apparatus mounted within the assembled base and cover portions.

Claim 3

An enclosure with electrical power control apparatus as set forth in claim 1, wherein said closed inner end of said base portion is dished; and said closed outer end of said cover portion is dished.

Claim 4

An enclosure with electrical power control apparatus as set forth in claim 1, wherein conduit ports are formed in said base portion to receive conduits and electrical conductors passing in and out of said assembled base and cover portions.

Claim 5

An enclosure with electrical power control apparatus as set forth in claim 1, wherein an operator assembly is mounted in said cover portion and having an operator handle mounted exteriorly of said cover portion adapted to control means inside said hollow cover portion to operate said electrical apparatus enclosed within said assembled base and cover portions.

Claim 6

An enclosure with electrical power control apparatus as set forth in claim 4 wherein said operator assembly includes an operator handle fastened on an outside end of a shaft rotatably threadedly mounted through a wall of said cover portion to form a seal between the outside and the inside of said hollow cover portion and an operator fastened on an inside end of said threaded rotatable shaft to engage an actuator on electrical apparatus inside said cover.

Claim 7

An enclosure with electrical apparatus comprising the combination of: a base portion having a hollow interior, a cylindrical sidewall, a closed base end adapted for mounting on a panel, and having a front facing opening; a cover portion having a hollow interior, a cylindrical lateral wall with a pair of longitudinal ridges protruding inwardly from opposite sides of said cylindrical lateral wall, and having an opening facing said opening of said base portion; said base portion and said cover portion being assembled with said opening on said cover portion abutting said front-facing opening on said base portion to form a completely enclosed hollow interior sealed from an ambient external atmosphere; clamping means securing said assembled cover portion and base portion together; a transverse mounting plate anchored in said base portion across said opening; a longitudinal mounting plate fastened to said transverse mounting plate projecting from said transverse mounting plate out of said opening dividing said hollow interior of said cover portion into two chambers, and having a channel on each lateral edge slidingly engaging said longitudinal ridges protruding inwardly from opposite sides of said lateral sidewall of said cover portion; electrical apparatus within said assembled base and cover portions and carried by said plates; and external manual controls on said cover portion with means communicating through a seal to operate said electrical apparatus.

Claim 8

An enclosure with electrical apparatus comprising the combination of: a base portion having a hollow interior, a cylindrical sidewall, a closed base end adapted for mounting on a panel, and having a front facing opening; a cover portion having a hollow interior, a cylindrical lateral wall with a pair of longitudinal ridges protruding inwardly from opposite sides of said cylindrical lateral wall, and having an opening facing said opening of said base portion; said base portion and said cover portion being assembled with said opening on said cover portion abutting said front-facing opening on said base portion to form a completely enclosed hollow interior sealed from an ambient external atmosphere; clamping means securing said assembled cover portion and base portion together; a transverse mounting plate anchored in said base portion across said opening; a longitudinal mounting plate fastened to said transverse mounting plate projecting from said transverse mounting plate out of said opening dividing said hollow interior of said cover portion into two chambers, and having a channel on each lateral edge slidingly engaging said longitudinal ridges protruding inwardly from opposite sides of said lateral sidewall of said cover portion; electrical apparatus within said assembled base and cover portions and carried by said plates; and external manual controls on said cover portion with means communicating through a seal to operate said electrical apparatus.

Claim 9

An enclosure with electrical apparatus comprising the combination of: a forwardly opening base portion having a shallow cylindrical sidewall relative to its circumferential length, a closed rearward end with means for mounting the enclosure on a panel, conduit ports providing access to said enclosure for electrical conductors, and an annular flange formed on a forward edge of said cylindrical sidewall with a forwardly facing sealing surface; a rearwardly opening cover portion having a broad cylindrical sidewAll, a closed forward end, external manually operable controls communicating through seals with the interior of said cover portion, and having an annular flange formed on a rearwardly edge of said cylindrical sidewall with a rearwardly facing sealing surface shaped to mate with said forwardly facing sealing surface on said flange on said base portion; said cover portion being assembled on said base portion and supported by said base portion with said rearwardly facing sealing surface of said cover portion in abutting engagement with said forwardly facing sealing surface of said base portion to form a completely enclosed hollow interior; an annular clamping ring fitted outside said annular flanges, having tightening means tightening said annular clamping ring circumferentially about said annular flanges, and having a channel-shaped cross section with diverging interior surfaces engaging said annular flanges and forcing said mating sealing surfaces together; and electrical apparatus mounted within said assembled base and cover portions that is in operative relation to said controls.

Claim 10

An enclosure with electrical apparatus comprising the combination of: a forwardly opening base portion having a shallow cylindrical sidewall relative to its circumferential length, a closed rearward end with means for mounting the enclosure on a panel, conduit ports providing access to said enclosure for electrical conductors, and an annular flange formed on a forward edge of said cylindrical sidewall with a forwardly facing sealing surface; a rearwardly opening cover portion having a broad cylindrical sidewAll, a closed forward end, external manually operable controls communicating through seals with the interior of said cover portion, and having an annular flange formed on a rearwardly edge of said cylindrical sidewall with a rearwardly facing sealing surface shaped to mate with said forwardly facing sealing surface on said flange on said base portion; said cover portion being assembled on said base portion and supported by said base portion with said rearwardly facing sealing surface of said cover portion in abutting engagement with said forwardly facing sealing surface of said base portion to form a completely enclosed hollow interior; an annular clamping ring fitted outside said annular flanges, having tightening means tightening said annular clamping ring circumferentially about said annular flanges, and having a channel-shaped cross section with diverging interior surfaces engaging said annular flanges and forcing said mating sealing surfaces together; and electrical apparatus mounted within said assembled base and cover portions that is in operative relation to said controls.

Claim 11

An enclosure with electrical apparatus comprising the combination of: a base having an outwardly opening hollow cylindrical shape with a closed dished inner end adapted for mounting on a panel, recessed conduit ports through its lateral cylindrical wall, legs projecting from said base substantially parallel to said lateral cylindrical wall whereby said base may be mounted to a panel with sufficient clearance for said dished end, and an annular flange formed on the outward end of its cylindrical walls presenting an outwardly facing machined, rigid sealing surface; a cover having an inwardly opening hollow cylindrical shape with a closed dished outer end, a manual control adjacent said outer end communicating through a seal with the hollow interior and recessed so as to be substantially within a profile of said cover, and an annular flange formed on the inward end of the cylindrical wall with an inwardly facing machined, rigid sealing surface abutting in sealing relationship said outwardly facing machined, rigid sealing surface of said flange on said base; an annular clamping ring fitted around said abutting flanges having tightening means and a channel-shaped cross section with diverging side surfaces engaging said flanges and formed as opposed inclined planes forcing such machined sealing surfaces of said flanges together; and electrical apparatus mounted within said base and cover.

Claim 12

An enclosure with electrical apparatus comprising the combination of: a base having an outwardly opening hollow cylindrical shape with a closed dished inner end adapted for mounting on a panel, recessed conduit ports through its lateral cylindrical wall, legs projecting from said base substantially parallel to said lateral cylindrical wall whereby said base may be mounted to a panel with sufficient clearance for said dished end, and an annular flange formed on the outward end of its cylindrical walls presenting an outwardly facing machined, rigid sealing surface; a cover having an inwardly opening hollow cylindrical shape with a closed dished outer end, a manual control adjacent said outer end communicating through a seal with the hollow interior and recessed so as to be substantially within a profile of said cover, and an annular flange formed on the inward end of the cylindrical wall with an inwardly facing machined, rigid sealing surface abutting in sealing relationship said outwardly facing machined, rigid sealing surface of said flange on said base; an annular clamping ring fitted around said abutting flanges having tightening means and a channel-shaped cross section with diverging side surfaces engaging said flanges and formed as opposed inclined planes forcing such machined sealing surfaces of said flanges together; and electrical apparatus mounted within said base and cover.