| 摘要 |
PROBLEM TO BE SOLVED: To provide a circular louver device for an electric apparatus housing box in which fitting angle can be easily aligned, and the fitting angle is not deviated when a fastening screw is screwed after fitting.SOLUTION: A circular louver device for an electric apparatus housing box comprises: a cylinder part 7 fitted with a ventilating opening 6 formed on a housing 1 of an electric apparatus housing box; a louver body 5 having blades covering the opening 6; and a fastening screw screwed with a screw part 8 formed on an outer periphery of the cylinder part 7 and fixing the louver body to the housing. An outer notch part 11 obtained by notching an outer periphery 10 of the cylinder part 7 in a forward and backward direction is provided as means for defining position for fitting the cylinder part 7 with the opening 6, and preventing rotary movement from the fitting position in fastening the fastening screw 9. |
