Bell-striking clock

Details Bell-striking clock Bell-striking clock

1980-03-10

1981-06-30

Jackmon, Edith S.

Horology: time measuring systems or devices

Chronological

With simultaneous time indicating means

368243, 340384E, 340392, G04C 2106

Patent

active

042766257

ABSTRACT:
An electronic clock emitting half-hourly time signals corresponding to the strokes of ships' bells comprises an electromagnetic striker driven by a normally blocked astable multivibrator whenever the closure of contacts operated by an associated clockwork, stepped by a crystal-controlled square-wave generator, coincides with a half-circle of predetermined polarity of the generated square wave. The multivibrator has a period of approximately 3/4 the duration of a half-circle of the square wave whereby not more than two pulses energizing the striker mechanism can be emitted by it during an unblocking half-circle so that strokes occurring at the ends of a second, third and fourth hour of a four-hour watch will appear in distinct pairs while those on the preceding half-hours will form one or more pairs followed by a single stroke after a larger time interval. The total number of strokes produced in each instance is determined by a comparator receiving the output of an electronic counter, advanced by the multivibrator pulses, together with binary signals generated by a multibank rotary switch entrained by the clockwork.

REFERENCES:
patent: 2791146 (1957-05-01), Kunz
patent: 2988708 (1961-06-01), Schmidt
patent: 3577725 (1971-05-01), Ganter et al.
patent: 3689919 (1972-09-01), Ganter et al.

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