Apparatuses for producing tight joints or seals in underground pipelines

Claim 1

An underground pipeline repair apparatus positionable inside an underground pipeline for producing an internal tight joint at a socket juncture between two pipes of an underground pipeline, said repair apparatus comprising a carriage, at least two angularly spaced sets of radially extendable rolling members mounted on the carriage to be engageable with the inner surface of the pipeline to support the carriage, retractable radially extending anchoring means, actuator means for said anchoring means for selectively moving said anchoring means radially to forcefully engage the inner surface of the pipeline for preventing movement of the carriage with respect to the pipeline, a plurality of reservoirs of synthetic components, a longitudinal support member mounted for axial reciprocation on said carriage and having an outer end, a spray head mounted on the outer end of the longitudinal support member, a first driving means connected to said rolling members for rapidly moving said carriage along the interior of said underground pipeline, said spraying head being connected to said reservoirs for receiving the contents thereof and second driving means for reciprocating said longitudinal support member at a variable speed when said anchoring means is in an extended position.