Method and apparatus for reversing a tubular bag
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United States of America Patent
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Jun 29, 1993
Issued Date -
N/A
app pub date -
Sep 21, 1992
filing date -
Mar 6, 1990
priority date (Note) -
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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.
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