Short time alarm clock - has indicator moving behind fixed disc of standard timer for setting alarm

摘要

Short time indication for telephone usage with little modification to conventional 1-hour timer is achieved by display unit (4) behind the fixed disc (3). The display provides triggering of the audio signal indicating that the set time for telephone conversation is coming to its end. An additional pointer (6) is moved in the timer winding direction for shifting the sweep angle for sound triggering. Both the main indicator and the additional pointer can be engraved on a transparent setting disc for easy operation.