Door bell, electric door bell, essentially characterized in that it comprises the provision of a general box of coverage of the set, which includes self-fixing means in doors, counting the circuit with a power supply battery with automatic points for opening and closing the circuit in relation to the movement of the door, being provided that the positive pole of the battery passes through a terminal and coil that inside presents an iron core and when a magnetic mass is produced, it attracts a plate carrying a hammer of forcefulness in a bell, returning to the previous position by means of a spring that makes successive contacts in another spring, causing the audible intermittence. (Machine-translation by Google Translate, not legally binding)
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