GB1253409A - An electric alarm clock - Google Patents

Abstract

1,253,409. Alarm clocks. UHRENFABRIK SENDEN G.m.b.H. Sept.29, 1969 [Sept. 28, 1968], No. 47870/69. Heading G3T. In an alarm clock having an electric movement, an electrically illuminated clock face, and an electrically actuated alarm, a manually operable and automatically returnable stop mechanism stops and keeps stopped, the alarm and switches on the clock face illumination and an alarm control mechanism is arranged to actuate the alarm at a predetermined time for a limited period and to cancel operation of the stop mechanism on expiry of said period, and to prevent operation of the stop mechanism from interfering with subsequent or simultaneous actuation of the alarm by the control mechanism, and the arrangement is such that the stop mechanism when operated before or at the same instant as the alarm actuation is ineffective to stop the alarm until release and re-operation of the stop mechanism. The alarm may comprise a buzzer the circuit of which is completed at a desired time when an arcuate contact 21 Fig. 3 (not shown) or the hour wheel 7 engages an alarm wheel (11). This occurs when projections on the hour wheel 7, Fig. 1a which is urged axially by a spring 14, are permitted to enter recesses in the alarm wheel (11). The arcuate contact (21) is formed integrally with a contact plate (22) connected in the alarm circuit via resilient blades 29. 30 carried by an arm 31 which is movable about a pivot pin 32 when the hour wheel 7 is moved axially, to engage a contact 37, Fig. 1c (not shown), carried by its end 36, with a fixed contact 38. The alarm is interrupted by manual operation of a lever 42 to pivotally move a lever 56 so that a projection 60 at its end 59 separates the contacts 37, 38 and is held therebetween by a catch 61. If the lever 42 is operated before the alarm has been actuated the end 59 will not be retained between the contacts 37, 38 and the levers 42, 56 on release are returned by a spring 57. On operation of the lever 42 simultaneously with the initiation of the alarm actuation of the end 59 is prevented from entering the contacts 37, 38 by a projection 47 at the end 63 of an extension 62 of the spring 14. Whenever the lever 42 is operated the clock face illumination is energized by the completion of a circuit through the lever 42 and a contact 49.