Compact apparatus for everting a liner and method

Details Compact apparatus for everting a liner and method Compact apparatus for everting a liner and method

1994-10-07

1997-01-28

Nguyen, Khanh P.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Including shaping means comprising fluid pressure contacting...

156287, 156294, 264516, 118254, 118DIG10, 425392, B29C 6336

Patent

active

055973531

ABSTRACT:
A compact apparatus for everting a liner utilizing fluid pressure after the liner has been aligned with the conduit to be lined is provided. The apparatus includes a sphincter valve with its axis aligned with the conduit to be lined and an eversion pressure chamber overlapping a portion of the sphincter valve for reducing the length of the apparatus and allowing positioning in a sewer manhole. A downtube is positioned at the input side of the sphincter valve which can extend to the top of the manhole. To install a liner, the apparatus is placed in the entrance manhole with the sphincter valve aligned with the axis of the sewer pipe, the liner is inserted into the downtube, turned to align with the sphincter valve and conduit and fluid pressure is applied to the valve to engage the flattened liner which after passing through the valve is everted by fluid pressure as it enters the sewer pipe.

REFERENCES:
patent: 4368091 (1983-01-01), Ontsuga et al.
patent: 4948452 (1990-08-01), Morinaga et al.
patent: 5108533 (1992-04-01), Long et al.
patent: 5167901 (1992-12-01), Driver et al.
patent: 5374174 (1994-12-01), Long
patent: 5454401 (1995-10-01), Kamiyama et al.

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