EP 2100080 A2 20090916 - RECTANGULAR/SQUARE SPIRAL DUCTING SYSTEMS WITH FLANGE CONNECTORS AND METHOD OF MAKING THE SAME
Title (en)
RECTANGULAR/SQUARE SPIRAL DUCTING SYSTEMS WITH FLANGE CONNECTORS AND METHOD OF MAKING THE SAME
Title (de)
RECTANGULAR/SQUARE SPIRAL DUCTING SYSTEMS WITH FLANGE CONNECTORS AND METHOD OF MAKING THE SAME
Title (fr)
SYSTÈMES DE CONDUIT EN SPIRALE RECTANGULAIRE/CARRÉ AVEC CONNECTEURS À BRIDES
Publication
Application
Priority
- US 2007086817 W 20071207
- US 87383706 P 20061208
- US 96800107 P 20070824
Abstract (en)
[origin: WO2008073837A2] A duct structure (50), includes lengths of square/rectangular duct (52) manufactured by preforming spiral duct in round cross-section (51) and then transforming the round cross-section into square and rectangular cross-sections utilizing expandable die structures (58). The duct (52) may be connected together end to end by flanged connectors (54) formed from strip stock (220), that is notched at locations that correspond to the corners of the formed flange connector. The cross-sectional profile of the flanged connector is then formed by roll forming and/or bending and/or other techniques. Thereafter, the strip stock is bent at its notched locations to define the corners (230) of the flange connector (54) and then the free ends of the strip stock are fixed together.
IPC 8 full level
F24F 13/02 (2006.01)
CPC (source: EP GB)
B21C 37/127 (2013.01 - EP GB); B21C 37/155 (2013.01 - EP GB); B21C 37/30 (2013.01 - EP GB); B21D 5/086 (2013.01 - EP GB); F16L 23/14 (2013.01 - EP GB); F24F 13/0209 (2013.01 - EP GB); F24F 13/0245 (2013.01 - EP)
Citation (search report)
See references of WO 2008073837A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2008073837 A2 20080619; WO 2008073837 A3 20081120; EP 2100080 A2 20090916; GB 0911010 D0 20090812; GB 2457414 A 20090819; GB 2457414 B 20110330
DOCDB simple family (application)
US 2007086817 W 20071207; EP 07869046 A 20071207; GB 0911010 A 20071207