초록 ▼

A connector for connecting end-to-end two spiral-wound sheet metal air ducts. The connector is an annular structure with opposite end segments, each of which presents an annular recess or groove which is open at its outer end and closed at its inner end and filled with sealing mastic there. The dime

A connector for connecting end-to-end two spiral-wound sheet metal air ducts. The connector is an annular structure with opposite end segments, each of which presents an annular recess or groove which is open at its outer end and closed at its inner end and filled with sealing mastic there. The dimension of each recess or groove transverse to the longitudinal axis of the ducts and the connector is substantially equal to the maximum thickness of the corresponding duct (i.e., where its spiral rib is located) so that each duct has a snug sliding fit in the corresponding recess.

대표청구항 ▼

An annular connector for connecting first and second air ducts, said connector having a central axis, interconnected recessed opposite end segments spaced apart along said axis for respectively receiving said first and second ducts, and an annular middle portion extending between and interconnecting

An annular connector for connecting first and second air ducts, said connector having a central axis, interconnected recessed opposite end segments spaced apart along said axis for respectively receiving said first and second ducts, and an annular middle portion extending between and interconnecting said recessed end segments, each of said recessed end segments of the connector comprising: an annular outer member shaped and dimensioned to fit snugly but slidably around a spiral-wound air duct having an external spiral rib thereon; an annular inner member shaped and dimensioned to fit snugly inside said duct substantially beyond said outer member in the direction along said axis away from said middle portion of the connector, whereby to engage the inside of the corresponding duct substantially beyond said outer member in said direction; said outer and inner members defining between them an annular recess which is open at the end of said end segment away from said middle portion of the connector to receive said air duct and closed at its end next to said middle portion of the connector by said middle portion; and sealing mastic filling said recess at said closed end for substantially air-tight engagement with the end of said duct received in said recess.