Patent
1976-11-22
1979-03-13
Schaefer, Robert K.
58 23R, 58 34, 58 35R, 58 855, G04C 300, G04B 2700
Patent
active
041435095
ABSTRACT:
A time-keeping system of the type having an electromechanically driven, analog-type time display, has a purely electrical integral hour reset feature. The system comprises an analog time display including hour and minute hands driven through a mechanical transmission by a fast-response electromechanical motor. A stable oscillator generates a high frequency time base signal. A chain of frequency dividers coupled to the oscillator develops a time-keeping signal at a minute-related frequency for driving the analog time display in a normal time-keeping mode, and for developing hour reset pulses at a frequency much higher than one pulse per second for driving the analog time display during an integral hour reset operation. Control means coupled to the chain of frequency dividers and responsive to an integral hour reset command causes the analog time display to be rapidly driven by a burst of hour reset pulses whose number equals precisely that number of pulses required to move the hour hand in exact compliance with said command.
REFERENCES:
patent: 3732685 (1973-05-01), Haydon
patent: 3897700 (1975-08-01), Haydon
patent: 4030283 (1977-06-01), Sauthier et al.
Coult John H.
Pojunas, Jr. Leonard W.
Schaefer Robert K.
Zenith Radio Corporation
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