发明名称 |
Corner piece-less duct, method of producing the same, and duct-forming machine |
摘要 |
A cornerplate-less duct includes plate members joined to each other at side end portions by a seam joint to form a tubular duct having a rectangular cross-section. Two end portions of a plate are bent perpendicular to a longitudinal direction of the plate to form flange forming portions. Corner forming portions protrude from side ends of the flange forming portions in a width direction to form corner portions at the end portions of the duct. In an expanded shape of the plate, a cut portion is provided close to a longitudinal center of the plate member such that the cut portion extends in a width direction of the plate member and has a depth substantially equal to an overlapping portion of the corner forming portion.
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申请公布号 |
US7490872(B2) |
申请公布日期 |
2009.02.17 |
申请号 |
US20050532312 |
申请日期 |
2005.10.03 |
申请人 |
AIR SYSTEM KABUSHIKI KAISHA |
发明人 |
YAMAMOTO TOSHIO;MARUKAWA MITSURU;YOSHIMOTO YOSHIMASA;IIZUKA SHOZO;HARA TAKASHI |
分类号 |
F16L25/00;F16L9/00;F24F13/02 |
主分类号 |
F16L25/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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