Plastic profiled strip forming helically wound tube using hinged flap for jointing
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United States of America Patent
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Aug 26, 1997
Grant Date -
N/A
app pub date -
Jan 11, 1996
filing date -
Jul 14, 1993
priority date (Note) -
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Abstract
A plastic profiled strip (10) is provided for producing helically wound tubes or pipes, the strip (10) having female and male joint formations (13, 14) extending along opposite longitudinal margins thereof and arranged so that upon spirally winding the strip into a tubular form, the joint formations (13, 14) can be interlocked to thereby lock adjacent windings of the strip together, the male joint formation (14) comprising a hinged flap (15) which is flexibly connected to the strip (10) for hinging movement between a disengaged or unlocked position displaced from the plane of the strip (10) and a locking position wherein it interlocks with the female joint formation (13) of an adjacent winding of the strip (10).
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