| 摘要 |
PROBLEM TO BE SOLVED: To provide a universal duct which can be arranged to suit on-site situations. ! SOLUTION: The universal duct includes a square cylindrical main duct 2, a square cylindrical movable duct 3 of which one side of one opening is connected to one side of the opening of the main duct 2 so as to be turnable with the side as an axial center, and which is turnable relative to the main duct 2, and extension wall parts 31, 32 for preventing the formation of a void between the opening of the main duct 2 and the opening of the movable duct 3 when the movable duct 3 is turned. ! COPYRIGHT: (C)2015,JPO&INPIT |
