Sealing ring for spigot and socket pipe joint
AssigneeJohns Manville
InventorsDavid W. French, Robert W. Heisler, Antonio Maldarella, Jr., Gilbert W. Vanhoy
Life of this patent
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Abstract
Joints for thermoplastic pipe. The necessity of providing a sealing ring between the socket and spigot of such a joint results in forming a ring groove in the socket and affixing the sealing ring within this ring groove. The present invention contemplates forming a sealing ring groove 6 so configured around a sealing ring 11 with a substantially axially incompressible portion 12 to lock the sealing ring in place and also to enhance the ease of assembly and ability of the thus assembled joint to structurally withstand elevated hydrostatic pressures. Also disclosed is an apparatus 20 and 44 for forming the preferred socket configuration.
Claims10
A socket of a spigot and socket joint for connecting a pipe to said socket, said socket having a first substantially cylindrical portion, a second substantially cylindrical portion, an inwardly open sealing ring groove positioned between and extending radially outwardly of said first and second cylindrical portions, said ring groove having an outer wall portion connected to said cylindrical portions by generally radially extending first and second wall portions, a sealing ring fixedly positioned within said ring groove, said sealing ring including a substantially rigid outer portion and a resilient inner portion for sealingly engaging the outer surface of said spigot, the axial distance between the inner surfaces of said first and second wall portions adjacent said outer portion of said ring being substantially greater than the axial distance between said walls adjacent said inner portion of said ring, at least for substantially the entire circumference of said ring groove.
Dependencies are inferred from the claim text.