| 摘要 |
PROBLEM TO BE SOLVED: To secure a space for incorporating a light emitter and receiver 16 into a guide rail 3 in an electric shutter for a building in which the guide rail 3 for guiding the opening and closing of a shutter curtain 2 has an inner and outer double rail structure allowing removal of an inner rail 7 from an outer rail 6 so that the shutter curtain 2 can be replaced.SOLUTION: A space (gap) S3 is provided in an arrangement dimension portion of a screw 10b for fixing inner and outer rails formed in a boundary part between the inner rail 7 and the outer rail 6, and the light emitter and receiver 16 is disposed in the space S3. |
