Corner piece-less duct, method of producing the same, and...

Details Corner piece-less duct, method of producing the same, and... Corner piece-less duct, method of producing the same, and...

2003-10-22

2009-02-17

Bochna, David E (Department: 3679)

Pipe joints or couplings

Materials

Sheet

C138S162000, C138S163000

Reexamination Certificate

active

07490872

ABSTRACT:
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.

REFERENCES:
patent: 1103988 (1914-07-01), Murray
patent: 1484491 (1924-02-01), Gutermann
patent: 1664885 (1928-04-01), Huenefeld
patent: 2131804 (1938-10-01), Holub
patent: 2498753 (1950-02-01), Deitsch
patent: 2750211 (1956-06-01), Curtis
patent: 2956587 (1960-10-01), Fisher
patent: 3636984 (1972-01-01), Rauhauser
patent: 4328981 (1982-05-01), Greene et al.
patent: 4466641 (1984-08-01), Heilman et al.
patent: 4579375 (1986-04-01), Fischer et al.
patent: 5784915 (1998-07-01), Allemann et al.
patent: 6957670 (2005-10-01), Kajino
patent: 61-072319 (1986-04-01), None
patent: 61-72319 (1986-05-01), None
patent: 04-084627 (1992-03-01), None
patent: 4-84627 (1992-03-01), None
patent: 05-172281 (1993-09-01), None
patent: 3023127 (1996-01-01), None
patent: 10-047741 (1998-02-01), None
patent: 10-47741 (1998-02-01), None
patent: 2000-117359 (2000-04-01), None
patent: 2001-355906 (2001-12-01), None
patent: WO-01/84058 (2001-08-01), None
International Search Report for International Application No. PCT/JP03/13458 dated Jan. 27, 2004 from the Japanese Patent Office.

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