Duct core with strengthening tape
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United States of America Patent
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-
Dec 1, 1992
Issued Date -
N/A
app pub date -
Jun 20, 1988
filing date -
Jan 6, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Strengthening the core of an insulated flexible duct formed of a helical wire wrapped with a flexible material with reinforcing tape. Strengthening tape is applied to the surface of the duct along its entire length. The apparatus for applying the strengthening tape is a tray having adjustable wiping arms. The wiping arms stretch the duct out as it is pulled through the tray. A roll of tape is mounted adjacent to the wiper arms and is automatically applied as the duct is pulled along the tray through the wiper arms. At least two wiper arms and continuous strips of tape along the longitudinal surface of the duct core are preferred.
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