Back to results
US 4,398,726 AGranted
Pipe section including a gasketed spigot end and method of making the same
AssigneeJ. & M. Manufacturing Co., Inc.
InventorRobert W. Heisler
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeJ. & M. Manufacturing Co., Inc.
InventorRobert W. Heisler
Estimating the term…
Certain pipe sections require an annular sealing gasket to be permanently positioned on the spigot portion. This is especially desirable with pipe sections formed with helically preceding reinforcing ribs. Disclosed is pipe section including a spigot end 2 having an annular groove 4 positioned adjacent the end surface thereof. Within groove 4 is placed fluid, settable bedding material 14 which has positioned therein and impregnated thereby a reinforcing material 15, preferably consisting of a ribbon of fiberglass material. Annular sealing gasket 3 is positioned in this groove 4 and onto the settable material 14 which is caused to intimately contact both the surface of the groove 4 and the sealing gasket 3. The thus sealed, bonded and reinforced spigot end retains the structural integrity and resistance to crushing loads and impact strength as is inherent in the rib reinforced pipe section.
A pipe section comprising a spigot end including a sealing gasket positioned on said spigot end, said sealing gasket positioned in an annular groove in the outer surface of said spigot end approximate the end surface of said spigot end, a bedding material sealingly engaging and adhered to at least the radially innermost annular surface of said annular groove, means embedded in said bedding material for providing circumferential reinforcement to said pipe section at said annular groove, said sealing gasket adhered to said groove by said bedding material, said sealing gasket extending radially outward from said groove, said means for providing circumferential reinforcement comprises an elongated, flexible, porous, longitudinally inextensile member positioned circumferentially around said spigot end in said groove, said circumferential reinforcement being impregnated by and substantially encapsulated in said bedding material.
A method of making a gasketed spigot end on a pipe section comprising:
A method of making a gasketed spigot end on a pipe section, said pipe section formed of a helically wound ribbon of thermoplastic material with adjacent helical convolutions forming a helical joint therebetween, said method comprising:
Dependencies are inferred from the claim text.