Assembly method of photoelectric smoke detectors and photoelectric smoke detector

摘要

PROBLEM TO BE SOLVED: To provide a photoelectric type smoke sensor capable of facilitating the assembling work of an insecticidal net by inserting the end part of the insecticidal net between plural projections provided on the bottom surface side of a cover and the inner side wall of the cover and clamping it by the projections and the inner side wall. ;SOLUTION: The cover 8 is in a blind cylindrical shape, a smoke stream entrance is provided on a side wall 20 and the eight pieces, for instance, of the projections 22 are formed on an inner bottom surface 21. The projections 22 are provided on a position provided with a clearance 24 with the inner side wall 23 of the cover 8 and the clearance 24 is made almost the same as or slightly larger than the thickness of the insecticidal net. Then, the end part of the insecticiclal net is clamped in the clearance 24. In the case that the clearance 24 and the thickness of the insecticidal net are almost the same, the end part of the insecticidal net is clamped between the projections 22 and the inner side wall 23 in a forcibly fed state. In the case that the clearance 24 is slightly larger than the thickness of the insecticidal net, the projections 22 are pushed and bent to the side of the inner side wall 23 in a post process and the end part of the insecticidal net is clamped. Thus, without using an adhesive material, the cover 8 and the insecticidal net are easily fixed in a short time.;COPYRIGHT: (C)1999,JPO