Door-open alarm device, specifically for a refrigerating appliance

Abstract From the Canadian patent

Door-open alarm device specifically for a, refrigerating appliance comprises an alarm means con, necked to an electric circuit which comprises arranged, on a stationary part of the appliance a voltage source, a switch with two positions in which the circuit is interrupted and closed respectively, electrical time delay means which when a current flows in the circuit produce a voltage variation across said alarm means after a delay, thereby triggering the alarm meams and arranged on a door of the appliance, a mechanical actuating element for the switch,which opens the switch when the door is wide open or closed; and which closes the switch when the door is ajar.