Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1982-08-16
1983-12-20
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
249 65, 264 405, 264262, 264263, 264269, 264314, 425170, 425417, 425DIG14, B28B 732, B28B 2120, B29C 112
Patent
active
044216980
ABSTRACT:
Method and apparatus for the economic and controlled application of grout at each of a series of joints in a pipeline. A short cylindrical tube is positioned in said pipeline opposite one joint at a time. The tube has an outer wall somewhat smaller in diameter than the inner diameter of the pipeline. The tube has an inner rigid portion and an outer flexible portion bonded to the rigid portion only at each end. There is a through opening at about the axial center of the tube, and the flexible portion only also has a cavity therein at the same place spaced from the through opening and filled with liquid by a flexible conduit sealed to it and extending into the tube's interior to a pressure gauge. Air is sent in between the flexible and rigid portions to swell the flexible portion and urge its outer wall into contact with the inner wall of the pipeline on each side of a joint, thereby sealing off that space. When the pressure exerted on the liquid and applied to the outer wall at said joint reaches a predetermined amount, grout is sent into the space in the joint between the pipeline and the tube, via a fitting member secured in the through opening.
REFERENCES:
patent: 1463872 (1923-08-01), Conn
patent: 1911894 (1933-05-01), Heintz
patent: 2055885 (1936-09-01), Weston
patent: 2395216 (1946-02-01), Fitzpatrick
patent: 2612673 (1952-10-01), Billner
patent: 3272894 (1966-09-01), Roach
patent: 3368005 (1968-02-01), Buczala et al.
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