Wecker mit elektrischer Wecksignalgabe

摘要

An electric alarm clock has an hour wheel which can move axially to engage with several teeth in an alarm-hour setting wheel and make an electrical contact therewith by means of a protruding metallic tongue on a conductive plate mounted on the nonconductive hour-wheel. This tongue makes a brief contact until further rotation of the hour wheel allows it to drop into the hole and open the circuit for the alarm. A second pair of contacts in series with the first-mentioned pair is closable on axial shifting of the hour-wheel into the alarm wheel. A contact-breaking arm of nonconductive material can be pushed between these second contacts and is clamped by them there until the hour-wheel is automatically cammed out of and away from the alarm wheel, whereupon the contact-breaking arm is released. Depression of a button on the clock lights a lamp for illuminating the clock dial face and can shift the contact-breaking arm toward the second contacts to open same. Means is provided to prevent pivoting of the contact-breaking arm between the contacts except when the teeth of the hour-wheel are engaged fully in the holes in the alarm wheel.