초록 ▼

Disclosed are coupling joints for interconnecting the ends of metal conduit sections having plastic liners to form a continuously lined conduit and methods for making such joints. The opposed open ends of lined pipe are fitted with flanged end face collars which cover the end faces of the pipe and t

Disclosed are coupling joints for interconnecting the ends of metal conduit sections having plastic liners to form a continuously lined conduit and methods for making such joints. The opposed open ends of lined pipe are fitted with flanged end face collars which cover the end faces of the pipe and the open ends are then joined in an abutting relationship within a coupling sleeve by interference fit coupling. The coupling sleeve carries an internal sealing band which mates with the outer edges of the opposed collars to fully seal the joint and the ends of the coupling sleeve are radially crimped into a corresponding groove in the pipe to mechanically interlock the joint. Fully lined couplings are also formed by fitting an end face collar in the pin end of one lined conduit and interference fitting the pin end into an unlined bell on a lined conduit.

대표청구항 ▼

A coupling joint interconnecting two lengths of metal pipe comprising: (a) first pipe means having a plastic liner on the internal surface thereof, the end face of said plastic liner substantially coterminous with the end face of said pipe means; (b) an end face collar comprising a tubular plastic b

A coupling joint interconnecting two lengths of metal pipe comprising: (a) first pipe means having a plastic liner on the internal surface thereof, the end face of said plastic liner substantially coterminous with the end face of said pipe means; (b) an end face collar comprising a tubular plastic body, the external diameter thereof substantially conforming to the internal diameter of said liner in said first pipe means and having a radially extending flange at one end thereof, said end face collar positioned within the open end of said first pipe with said radially extending flange adjacent the end face of said first pipe means; and (c) second pipe means having an internal diameter at the open end thereof less than the external diameter of said first pipe means and having a plastic liner on the internal surface thereof, the end of said plastic liner terminating within said second pipe means at a point removed from the open end thereof, wherein the end of said first pipe means is telescopically interference fit within the open end of said second pipe means and said radially extending flange overlaps said plastic liner in said second pipe means.