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US 4,123,895 AGranted
Gear train of quartz-crystal timepiece having analogue display
AssigneeKabushiki Kaisha Daini Seikosha
InventorJoichi Miyazaki
Life of this patent
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Abstract
In a timepiece, a seconds gear wheel mounted for rotation on a plate, and a battery and a gear train mounted on opposite sides of the seconds gear wheel. The gear train engages the seconds gear wheel and a transducer for rotating the seconds gear wheel. The seconds gear wheel has a radius smaller than a difference between a radius of the plate and a diameter of the battery. The resulting structure is very compact.
Claims2
In a timepiece:
- an electro-mechanical transducer;
- a seconds gear wheel mounted for rotation and rotated to indicate passage of time in units of seconds;
- a battery for powering said electro-mechanical transducer;
- a plate having said seconds gear wheel, said battery and said electro-mechanical transducer disposed thereon;
- mounting means for rotatably mounting said seconds gear wheel on said plate;
- and a gear train engaging said seconds gear wheel and said electro-mechanical transducer for rotating said seconds gear wheel to indicate passage of time in units of seconds upon operation of said electro-mechanical transducer, said gear train comprising at least two gear wheels each engaging a respective one of said electro-mechanical transducer and said seconds gear wheel, and wherein at least one of said two gear wheels is an idle gear;
- and wherein said seconds gear wheel has a radius smaller than a difference between a radius of said plate and a diameter of said battery, and said plate has a diameter less than 26 millimeters.
4 more elements
Dependencies are inferred from the claim text.