Electrical chess clock

Details Electrical chess clock Electrical chess clock

1976-08-03

1978-03-21

Schaefer, Robert K.

58145D, G04F 800

Patent

active

040795837

ABSTRACT:
The invention relates to an electrical chess clock comprising a pair of time measuring circuits each having a digital time display device. The time measuring circuits are driven by a common pulse source which may alternately be connected to the time measuring circuits by means of a switching circuit being operated by the players. The digits of the time display device which normally indicates minutes may in certain periods of time, for example during the last minute of each hour, be shifted to indicate seconds. It is then sufficient that each time display device contains three digits.

REFERENCES:
patent: 3662535 (1972-05-01), Hedrick et al.
patent: 3698180 (1972-10-01), Klein
patent: 3878675 (1975-04-01), Prociuk
patent: 3961473 (1976-06-01), Hung

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