Pipe joints or couplings – Repair
Patent
1981-10-19
1984-12-11
Callaghan, Thomas F.
Pipe joints or couplings
Repair
285 21, 285 55, 285338, 285DIG16, F16L 914
Patent
active
044874324
ABSTRACT:
A no-hole insertion joint and method for the repair or relining of fluid conduits such as gas service lines and the like. The joint structure and method are particularly adapted for use in the repair or relining of gas service lines from a building in order to eliminate the requirement of exterior digging or excavation. A tubular conduit is provided which includes, at the free and thereof, a joint and sealing structure. The tubular conduit and the attached joint and sealing structure are inserted into the existing service line a distance so as to be in proximity with the tee at the main. Once in place, the joint and sealing structure is activated by means of heat producing a melting of a low melting point alloy which, in turn, causes a gasket to be brought into sealing contact with the internal wall of the service line. The joint and sealing structure includes a sleeve of low melting point alloy, an elastomeric seal and a compression spring which is positioned so as to exert a longitudinal force on the sleeve. Upon the application of heat to the sleeve, the spring causes the melt to expand radially outwardly carrying the elastomeric gasket into sealing contact with the internal wall of the fluid conduit.
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Passerell David P.
Volgstadt Frank R.
Callaghan Thomas F.
Perfection Corporation
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