Correct answer displaying device for arithmetic practicing unit

Details Correct answer displaying device for arithmetic practicing unit Correct answer displaying device for arithmetic practicing unit

1985-09-30

1987-06-23

Frankfort, Charles

Signals and indicators

Indicators

Push-button type

116200, 116312, 116314, 434202, G09B 300

Patent

active

046744339

ABSTRACT:
A correct answer displaying device for an arithmetic practicing device or the like. Plural chambers are arranged in matrix form with partition boards, and a colored transparent plate is placed over the chambers on which numerical problems to be solved are indicated and through which the configurations of the correct answer numbers cannot ordinarily be observed. Answer levers are operated to cause white plates to come near the lower surface of the colored transparent plate to display the correct answers. The white plates are pivotally mounted about one side thereof in which an engaging step is formed. Each answer lever, which has an engaging protrusion engaged with a respective engaging step, is accommodated in a guide frame in such a manner that the answer lever can pass in and out of the corresponding chamber.

REFERENCES:
patent: 2614162 (1952-10-01), Smith
patent: 3237591 (1966-03-01), Pichel
patent: 3366765 (1968-01-01), Beale
patent: 3855959 (1974-12-01), Hinze
patent: 4258477 (1981-03-01), Ishiyama

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