| 摘要 |
PCT No. PCT/DE96/02430 Sec. 371 Date Aug. 12, 1998 Sec. 102(e) Date Aug. 12, 1998 PCT Filed Dec. 14, 1996 PCT Pub. No. WO97/23743 PCT Pub. Date Jul. 3, 1997The invention relates to a butt joint between two circular or flat, oval air duct sections (10) each with a connection flange (32) at each end and a ring (34) clamping the connection flanges together. Said connection flanges (34) are moulded, to form one part, to the duct wall (12) of each air duct section (10) and each have an outwardly-projecting annular edge (14) and clamping legs (24) drawn together by corresponding side legs (38) of the clamping ring (34). Each annular edge (14) forms an angle of 80 DEG to 90 DEG , preferably 87 DEG to 89 DEG , with the associated duct wall (12). Each connection flange (32) can also have another or a plurality of supporting legs (28). |
