Apparatus for repairing leaks in underground pipe

Details Apparatus for repairing leaks in underground pipe Apparatus for repairing leaks in underground pipe

1981-07-09

1983-01-25

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Product or preform repair or restoring means

Means feeding fluent stock under pressure

425112, 425122, 425 59, 425 62, B29D 2308

Patent

active

043701132

ABSTRACT:
An apparatus for repairing leaks in underground pipe which comprises a carriage movable axially along the pipe, a flexible and stretchable tubular cover sheet surrounding a portion of the carriage, a plurality of power driven back-up plates supported by the carriage and expandable radially to press the sheet into intimate contact with the internal wall surface of the pipe, and retractable radially for separating the sheet from the pipe wall, and a conduit inside the cover sheet for delivering grout radially outwardly through the cover sheet.

REFERENCES:
patent: 2484018 (1949-10-01), Crown
patent: 2851061 (1958-09-01), Bernard et al.
patent: 2894539 (1959-07-01), Cook et al.
patent: 3044136 (1962-07-01), Perkins
patent: 3091013 (1963-05-01), Robinson
patent: 3797981 (1974-03-01), Van Dijk

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