Differential timer

Details Differential timer Differential timer

1986-09-12

1987-07-21

Miska, Vit W.

Horology: time measuring systems or devices

Time interval

With alternately operating indicators

368 77, 368110, G04F 300

Patent

active

046814639

ABSTRACT:
A timing device is provided for the differential timing of game play, such as chess, employing an easily readable display means and an accurate timing means. According to the preferred embodiment of the present invention, the display means further comprises two concentric articulating discs of different color, usually black and white. The display is connected to an electric motor driven by an accompanying electric circuit such that one disc is driven by the motor. The direction of travel of the motor is controlled by player actuated switches which are tripped upon completion of each move. Differential time is displayed by the eclipse of one disc by the other.

REFERENCES:
patent: 2539754 (1947-02-01), Rettinger
patent: 3698180 (1972-10-01), Klein
patent: 3878675 (1975-04-01), Prociuk
patent: 3961473 (1976-06-01), Hung
patent: 3984109 (1976-10-01), Wiles
patent: 4021046 (1977-05-01), Barlois
patent: 4362393 (1982-12-01), Tissot

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