Bushing for transformers and the like

Claim 2

A bushing for a transformer or the like comprising an insulating member having a bore therethrough, an opening in said insulating member adjacent one end thereof intersecting with said bore and including at least one substantially flat side wall portion, a shoulder on said insulating member between said bore and opening, a rigid conductor member extending through said bore and opening including a pair of threaded ends extending exteriorly of said bore and opening, a flange on said conductor member adjacent to one of the threaded ends thereof for abutting engagement with said shoulder, a retainer in threaded engagement between the other of said threaded ends and the other end of said bushing urging said flange into engagement with said shoulder, and a pair of spaced seals on said conductor member sealably engaged between said conductor member and said bore and defining therein an isolated chamber.

Claim 3

A bushing according to claim 1, wherein said seals constitute indentical resilient grommets.

Claim 4

A bushing according to claim 1, wherein said flange also defines a seat engaged with one of said seals.

Claim 5

A bushing according to claim 3, comprising a sleeve about said conductor member in said bore having one end in abutment with said retainer and the other end defining another seat engaged with the other of said seals.

Claim 6

A bushing according to claim 1, comprising a sleeve in said bore having one end thereof abuttingly engaged with said retainer and the other end thereof in seating engagement with one of said seals, said conductor member extending through said sleeve.

Claim 7

A bushing according to claim 1, comprising at least one flat portion on said flange in abutting engagement with said flat side wall portion of said opening to obviate rotation of said conductor member in said bore.

Claim 8

A bushing according to claim 1, wherein said opening includes another flat side wall portion substantially parallel with and opposed to said first-named flat side wall portion, and opposed abutments on said flange respectively engaged with said first-named and other side walls to obviate rotation of said conductor member.

Claim 9

A bushing according to claim 1, comprising a terminal received on said one threaded end.

Claim 10

A bushing according to claim 8, comprising a metallic washer connected in abutting engagement between said terminal and said one end of said insulating member.

Claim 11

A bushing according to claim 8, comprising a resilient substantially conical washer biased in abutting engagement between said terminal and said one end of said insulating member, the resiliency of said washer compensating for a predetermined amount of expansion in the length of said conductor member.

Claim 12

In a transformer having a housing with an opening therein, a bushing assembly including a porcelain insulating member extending through said opening and having portions extending interiorly and exteriorly of said housing, an annular flange integrally formed on said exterior portion and extending about said opening, an annular seal disposed in said flange means for sealing engagement with said housing about said opening, a mounting ring securEd to said interior portion, adjustable means between said mounting ring and said housing about said opening for urging said seal into sealing engagement with said housing about said opening, a bore in said insulating member extending between the ends thereof, an opening in one of said ends intersecting with said bore including opposed substantially parallel side wall portions on said insulating member, and a shoulder on said insulating member between said opening and said bore, a solid conducting rod extending substantially coaxially through said bore and opening and having a pair of threaded end portions exteriorly of said bore adjacent to said ends of said insulating member, a flange integrally formed with said rod adjacent to one of said threaded end portions and extending substantially radially thereof for engagement with said shoulder, a pair of opposed flats on said flange respectively engaged with said side wall portions to prevent rotation of said rod, a threaded member threadedly engaged with the other of said threaded end portions and including a second flange in abutting engagement with the other of said ends of said insulating member, said first-named flange being urged into engagement with said shoulder in response to the threaded engagement of said threaded member with said other threaded end portion, a pair of spaced grommets sealably engaged between said rod and bore and defining therewith an isolated chamber in said bore, one of said grommets being seated against said first-named flange, a sleeve received on said rod within said bore and connected in abutting engagement between said second flange and the other of said grommets defining a seat therefor, a terminal for receiving a power lead threadedly connected with said one threaded end portion, a resilient conical washer received on said one threaded end portion and biased into abutting engagement between said terminal and said one end of said insulating member, said other threaded end portion also defining a terminal for receiving a transformer coil lead, and a third grommet engaged between said first-named flange and said washer substantially filling said opening, said third grommet being identical to the other grommets.

Claim 13

In a transformer having a housing with an opening therein, a bushing assembly including a porcelain insulating member extending through said opening and having portions extending interiorly and exteriorly of said housing, an annular flange integrally formed on said exterior portion and extending about said opening, an annular seal disposed in said flange means for sealing engagement with said housing about said opening, a mounting ring securEd to said interior portion, adjustable means between said mounting ring and said housing about said opening for urging said seal into sealing engagement with said housing about said opening, a bore in said insulating member extending between the ends thereof, an opening in one of said ends intersecting with said bore including opposed substantially parallel side wall portions on said insulating member, and a shoulder on said insulating member between said opening and said bore, a solid conducting rod extending substantially coaxially through said bore and opening and having a pair of threaded end portions exteriorly of said bore adjacent to said ends of said insulating member, a flange integrally formed with said rod adjacent to one of said threaded end portions and extending substantially radially thereof for engagement with said shoulder, a pair of opposed flats on said flange respectively engaged with said side wall portions to prevent rotation of said rod, a threaded member threadedly engaged with the other of said threaded end portions and including a second flange in abutting engagement with the other of said ends of said insulating member, said first-named flange being urged into engagement with said shoulder in response to the threaded engagement of said threaded member with said other threaded end portion, a pair of spaced grommets sealably engaged between said rod and bore and defining therewith an isolated chamber in said bore, one of said grommets being seated against said first-named flange, a sleeve received on said rod within said bore and connected in abutting engagement between said second flange and the other of said grommets defining a seat therefor, a terminal for receiving a power lead threadedly connected with said one threaded end portion, a resilient conical washer received on said one threaded end portion and biased into abutting engagement between said terminal and said one end of said insulating member, said other threaded end portion also defining a terminal for receiving a transformer coil lead, and a third grommet engaged between said first-named flange and said washer substantially filling said opening, said third grommet being identical to the other grommets.