| 摘要 |
<p>PROBLEM TO BE SOLVED: To enhance the working efficiency of coupling between a duct and a cover while eliminating interference of coupling tool and removal of the same on the occasion of walking on the duct, under the condition that there is no coupling tool on the upper surface of cover. SOLUTION: A coupling structure of duct and cover is provided with the duct 1 of which upper part is opened and which allows insertion of a piping, a cover 2 for closing the aperture of the duct 1, and a coupling tool 3 for coupling the duct 1 and cover 2. The cover 2 is formed wider than the duct 1 and is provided with a folding portion 4 by folding back both edge portions of the cover 2. The coupling tool 3 is structured with a first coupling tool 3a having the hooking part 5 to be hooked with the folding portion 4 of the cover 2 at the upper end thereof, and a second coupling tool 3b having, at the lower end part, the engaging portion 6 to be engaged with the lower end of the duct 1. The lower end of the first coupling tool 3a is provided with a connected portion 7, and the upper end of second coupling tool 3b is provided with a connecting portion 8 to be connected to the connected portion 7.</p> |
