Drainage element and apparatus and method for making same
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United States of America Patent
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Aug 28, 2012
Grant Date -
May 6, 2010
app pub date -
Nov 3, 2008
filing date -
Aug 2, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A preassembled drainage line element is fabricated with one or more flaps. In one embodiment, the drainage line unit is made from a webs of net material and a web of water permeable material and has two flaps at diametric points. The webs are formed about a barrel and the longitudinal edges are secured together, as by sewing a seam, to form a flap. The seam can be sewn at one of a plurality of spacings from the barrel to form a drainage line element of a different diameter from a standard diameter without need to adjust or replace other components of the fabricating machine.
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