Method and apparatus for reversing a tubular bag

Details Method and apparatus for reversing a tubular bag Method and apparatus for reversing a tubular bag

1992-09-21

1993-06-29

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

138 97, 156287, 156294, 156382, 264 36, 264269, 264570, 264572, 4253871, B29C 6336

Patent

active

052232042

ABSTRACT:
An apparatus for reversing a tubular bag for internally lining a utility pipe installed underground, which includes a container for defining a closed space and containing a liquid body, constructed such that an amount of a liquid body therein has first and second level surfaces, the first partially defining the closed space and the second being exposed to atmospheric air; a compressor to supply compressed air to the closed space; and the tubular bag to be reversed. The tubular bag is primarily arranged in a manner such that it penetrates through the liquid body passing the first and second level surfaces and also penetrates through the closed space, with one end portion of the bag placed in atmospheric air and the other end portion thereof reversed and fixed, and some of the reversed portion partially defining the closed space so that when the pressure in the closed space is increased that portion of the tubular bag which is defining the closed space is forced to inflate and be reversed further. Compressed air is supplied to the closed space by a compressor, whereupon the tubular bag is inflated and be reversed further. The bag itself can be used to contain the liquid body without employing a container.

REFERENCES:
patent: 3927164 (1975-12-01), Shimabukuro
patent: 4064211 (1977-12-01), Wood
patent: 4385885 (1983-05-01), Wood
patent: 4770562 (1988-09-01), Muller et al.
patent: 4883557 (1989-11-01), Morihaga et al.

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