| 摘要 |
A plurality of flange members are positioned oppositely of one another on the ends of a pair of generally rectangular sheet metal ducts. The flange members are positioned in pairs on the adjacent ends of the ducts. The angular legs of corner pieces extend into the ends of the flange members to connect the adjacent flange members on the end of each duct so that four corner pieces connect the flange members to form a frame around the respective duct end portion. The oppositely positioned flange members on the adjacent duct end portions are sealingly secured together by clamping together the adjacent corner pieces. Each flange member is formed by a thin walled sheet member and includes a pair of legs angularly disposed relative to one another to form a plurality of wall sections. A first wall section terminates in a first leg end portion, and a second wall section terminates in a second leg end portion. The first and second leg end portions are spaced apart. The first and second wall sections are positioned in overlying relation to receive the duct end portion therebetween. The duct end portion overlies the second wall section which extends around and below the duct end portion to a stop on the second leg end portion. The stop engages a plurality of protuberances or dimples on the surface of the duct adjacent the duct end portion to prevent retraction of the duct end portion from the flange member. The first leg end portion forms an abutment shoulder, and the duct end portion engages the abutment shoulder. Thus, the duct is rigidly secured between the stop and the abutment shoulder, thereby, eliminating freedom of movement between the flange wall sections to provide a torsionally rigid connection of each flange member to the duct end portion that resists bending of adjacent flange members away from each other to prevent air leakage at the duct joint.
|
