1975-03-28
1976-08-03
Weldon, Ulysses
58125R, G04B 2708
Patent
active
039721795
ABSTRACT:
Automatic indicia changer, such as a clock-calendar for displaying months, days of the month, days of the week, hours and minutes, comprises a plurality of series of plates bearing the various indicia, each series being rotatable about its axis under the influence of a ratchet wheel that is moved stepwise by a dog, each step changing the indicia one increment. The dog is swung by a lever which in turn is swung by a rotary cam. The first series of indicia is driven by a motor; while the first series drives the second and the second drives the third, and so on. Thanks to the ratchet wheel and pawl drive, each series of indicia can be manually adjusted without interrupting the automatic drive. Manual adjustment may be effected either rapidly, by turning the ratchet wheel with an external knob, or stepwise by pressing with the finger on a protrusion on the associated swingable lever.
REFERENCES:
patent: 543235 (1895-07-01), Fowler
patent: 905956 (1908-12-01), Thrasher
patent: 2762190 (1956-09-01), Holzner
patent: 2959914 (1960-11-01), Harada
patent: 3279166 (1966-10-01), Funaki
patent: 3721086 (1973-03-01), Flumm
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