Sealing plug

Abstract

A sealing plug .Iadd.assembly .Iaddend.includes a plug and a housing.Iadd., .Iaddend.the plug and the housing including co-operating .[.means.]. .Iadd.structures .Iaddend.whereby they may be secured together, the plug including two circumferentially extending grooves within which O ring seals are located, and the housing .[.including an aperture.]. .Iadd.having a bore .Iaddend.within which the plug is adapted to be located, the housing also including a spring loaded radially extending pin which projects into the .[.aperture.]. .Iadd.bore .Iaddend.and which is adapted to project into either of the grooves within the plug if an O ring is omitted, thus preventing the plug being secured with the housing by the co-operating .[.means.]. .Iadd.structures.Iaddend..

We claim: 
     
       1. A sealing plug .Iadd.assembly .Iaddend.comprising a plug member .[.and.]. .Iadd.having a radially outermost cylindrical surface, said surface defining at least one circumferentially extending groove for receipt of an O ring seal therein, .Iaddend.a housing .[.the.]. .Iadd.for said plug member, said housing defining a bore for location of said .Iaddend.plug .[.and housing including.]. .Iadd.member therein, .Iaddend.co-operating means .Iadd.on said plug member and said housing .Iaddend.whereby .[.the.]. .Iadd.said plug member .Iaddend.may be secured .[.together the radially outermost cylindrical surface of the plug including at least one circumferentially extending groove within which an O ring seal may be disposed, the housing including an aperture within which the plug is adapted to be located.]. .Iadd.within said housing, said housing further including at least one radially extending pin moveable between a first position projecting into said base of said housing and a second position in which it does not so project, said pin being adapted to locate .Iaddend.within .[.the.]. .Iadd.said .Iaddend.at least one circumferentially extending groove when .[.the.]. .Iadd.said .Iaddend.O ring is omitted from the assembly .[.such as.]. .Iadd.thereby .Iaddend.to prevent .[.the.]. .Iadd.said .Iaddend.plug .Iadd.member .Iaddend.being secured within .[.the.]. .Iadd.said .Iaddend.housing by .[.the.]. .Iadd.said .Iaddend.co-operating means. 
     
     
       2. A sealing plug .Iadd.assembly .Iaddend.as claimed in claim 1 in which the plug .Iadd.member .Iaddend.includes two circumferentially extending grooves within each of which an O ring seal is located. 
     
     
       3. A sealing plug .Iadd.assembly .Iaddend.as claimed in claim 1 in which the at least one radially extending pin is provided with spring means such that it is urged radially inwardly into the .[.aperture.]. .Iadd.bore.Iaddend.. 
     
     
       4. A sealing plug .[.device.]. .Iadd.assembly .Iaddend.as claimed in claim 1 in which the co-operating means which secure the plug .Iadd.member .Iaddend.within the housing consists of a bayonet type fitting. 
     
     
       5. A sealing plug .Iadd.assembly .Iaddend.as claimed in claim 1 which includes a magnetic chip detector for use within the oil system of a gas turbine engine.