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US 4,058,969 AGranted
Electric timepiece for displaying the operating condition thereof
AssigneeCitizen Watch Co., Ltd.
InventorsMunetaka Tamaru, Kazunari Kume, Hideshi Oono, Minoru Watanabe, Hideo Sato, Shigeru Morokawa
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Abstract
In a battery operated an electric timepiece operated by a battery of the type a time display, such as a second hand, when the voltage of the battery decreases below a predetermined value, the movement of the second hand is modified to give an alarm that the life of the battery has terminated.
Claims8
In a timepiece which is powered by voltage from a battery, an alarm system also powered by said battery indicating that the voltage of the battery has dropped below a predetermined level, said alarm system comprising:
- indicating means for indicating that the voltage has dropped below the predetermined value by changing from a normal condition to an alarm condition;
- means energized by the battery means operating the indicating means;
- a detecting circuit for generating an alarm signal when the voltage of the battery drops below the predetermined level;
- switch means connected between the battery and the operating means and connected to the detecting circuit for allowing the battery to energize the operating means upon the generation of the alarm signal, said switch means including means for deenergizing the operating means after the operating means has changed the condition of the indicating means from the normal condition to the alarm condition;
- means for retaining the indicating means in the alarm condition after the operating means is energized;
- and
- the indicating means including a mechanical member which is moved to change from a normal position to an alarm position.
4 more elements
Dependencies are inferred from the claim text.