Pipe coupler with thrust restraint

Abstract

An internal expansion coupling member for use in joining a pair of aligned tubular members in end-to-end relationship, where said tubular members are characterized by an essentially uniform diameter and are adapted to transmit a medium under pressure. The coupling member comprises an internal expansion coupling device formed of an elongated open ended tubular joint member consisting of a relatively rigid sheet-like member, where the sheet ends overlap such that the end portions lie essentially contiguous with each other. Preferably a compressive seal member is provided between the end portions. About the circumference of the joint member, means, such as an annular groove, is provided to position and retain an O-ring type member thereabout. At least one compressible and flexible O-ring type member, formed of a high temperature resistant material, is secured thereabout by said means. Finally, means for expanding the sheet-like member, whereby the sheet ends may be caused to move circumferentially towards one another to compress the seal member and to urge said O-ring type member against the inside wall of the tubular member, is provided to effect a pressure seal therebetween. In a preferred embodiment, a thrust restraint member, to prevent separation of the coupling member from the tubular member under conditions of high internal pressure, may be incorporated into the system of this invention.