CONNECTION STRUCTURE AND CONNECTION METHOD FOR SQUARE DUCT, AND SQUARE DUCT

摘要

PROBLEM TO BE SOLVED: To provide a connection structure of a square duct capable of being easily connected and also reducing costs.;SOLUTION: A connection structure of a square duct A has a joint part 2 at an end part. The joint part 2 comprises a connection part 3 provided at an end part of each wall plate 1. The connection part 3 is provided with a lower connection part, a medium connection part and an upper connection part in order from the wall plate 1 side, which are formed by folding the end part of the wall plate 1 is folded into three in substantial parallel with a plate surface of the wall plate 1, wherein a free end of the upper connection part more projects with respect to a folded part of the lower connection part and medium connection part. For example, the upper connection part of the connection part 3 of the square duct A is fitted between the upper connection part and medium connection part of the connection part 3 of a square duct, so that the square duct A and the square duct are connected.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT