Chess clock

Details Chess clock Chess clock

1997-04-07

1998-08-18

Roskoski, Bernard

Horology: time measuring systems or devices

Time interval

With alternately operating indicators

G04F 300

Patent

active

057966800

ABSTRACT:
A chess clock is disclosed in which clock pulses derived from a single source are switched alternately and mutually exclusively between two clocks, designated white's clock and black's clock. The mechanism for switching the clock pulses to and from each clock is operationally connected to their electronic circuitry by means of an optical beam, e.g., an infrared beam which is directed alternately to a pair of sensors connected respectively to control circuits for each clock. No mechanical or electrical operational connections are present between the switching mechanism and the electronic circuitry.

REFERENCES:
patent: 3395287 (1968-07-01), Rajac
patent: 3961473 (1976-06-01), Hung
patent: 4062180 (1977-12-01), Meshi et al.
patent: 4079583 (1978-03-01), Larsen
patent: 4382291 (1983-05-01), Nakauchi
patent: 4472067 (1984-09-01), Richardson et al.
patent: 4686361 (1987-08-01), Bard
patent: 4884255 (1989-11-01), Fischer
patent: 5420830 (1995-05-01), Camaratta et al.

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