Plastic article or earthenware shaping or treating: apparatus – Product or preform repair or restoring means – Means feeding fluent stock under pressure
Patent
1978-10-04
1981-01-20
Anderson, Philip
Plastic article or earthenware shaping or treating: apparatus
Product or preform repair or restoring means
Means feeding fluent stock under pressure
138 93, 138 97, 264 36, 264 452, 264 469, 264155, 408127, 425289, 425470, B29D 2704, B32B 520, F16L 5512
Patent
active
042459702
ABSTRACT:
A method for connecting a lateral sewer line to a main sewer line which is relined with a plastic pipe liner, comprises plugging a lateral sewer line upstream of the main sewer line to seal off the lateral sewer line, spraying a grout material downstream of the location of the plug until the space between the main sewer line and the plastic pipe liner is filled, allowing the group material to set, removing the plug from the lateral sewer line and providing an opening through the grout material and the plastic pipe liner so that the lateral sewer line is connected to and in communication with the plastic pipe liner. An apparatus which is used to plug the lateral sewer line and dispense the grout material comprises a spray gun positioned within a tubular inflatable bladder where the nozzle for the spray gun is in front of the bladder. The apparatus also includes means for conveying compressed air to and for conveying compressed air from the inflatable bladder. The inflatable bladder expands within a lateral sewer line which is connected to the main sewer line when compressed air is conveyed to the inflatable bladder and means for conveying grout material under pressure to the spray gun is provided to dispense the grout material in the space between the main sewer line and the plastic pipe liner.
REFERENCES:
patent: 3593749 (1971-07-01), Reardon
patent: 3602263 (1971-08-01), Bremner
patent: 3618639 (1971-11-01), Daley et al.
patent: 3762446 (1973-10-01), Tungseth et al.
patent: 3834421 (1974-09-01), Daley
patent: 3834422 (1974-09-01), Larson
patent: 3870085 (1975-03-01), Schneider
patent: 3894131 (1975-07-01), Speech
patent: 3950461 (1976-04-01), Levens
patent: 4083384 (1978-04-01), Horne et al.
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