A seam for ductwork has a male end portion integrally formed at a distal end of a duct wall and a female end portion integrally formed at another distal end of the duct wall. The female end portion includes a first fold and a second fold which define a female groove for accommodating the male portion. A distal end of the second fold is bent transverse to the female groove prior to the male portion being inserted into the female groove.
申请公布号
WO2004027303(A2)
申请公布日期
2004.04.01
申请号
WO2003US30309
申请日期
2003.09.23
申请人
MET-COIL SYSTEMS CORPORATION
发明人
TOBEN, JOHN, J.;BORWIG, MICHAEL, C.;SHAH, ASHOK, M.;BLUM, RICHARD, F.