| 摘要 |
FIELD: manufacture of door ringers using sound scale adjustment. SUBSTANCE: case 1 accommodates percussion unit 3 (sensitizer) and radiator 2. Clappers 9 kinematically secured on driving rod 4 strike at random or in definite sequence strip radiators 2 while rod is moving. In one of options, radiators are secured in parallel with top and bottom parts of case 1. In other option radiators 2 are made in the form of bells mounted on swivel shaft 16. One of radiators is joined through spring 17 to driving rod 4 and any other radiator is joined through spring 18 to case 1. In third option, driving rod 4 is made in the form of wide-pass helical ribbon surface. Percussion unit is, essentially, lever with spring-loaded clappers 9. Sound-radiating strips 2 are arranged on ring circumference uniformly in slits 26 and their shafts 21 are loosely mounted on bottom 22 and in cover 24 of case 1. EFFECT: improved design. 6 cl, 6 dwg |
