Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-05-09
1977-02-01
Caldwell, John W.
Communications: electrical
Audible indication
Percussion-type sound producer
340336, 40132D, G08B 500
Patent
active
040064760
ABSTRACT:
A changeable display apparatus and method is disclosed which is made up of a group of similar individual character modules, disposed in a substantially continuous viewing surface, each module comprising support panel or base and a set of identical and changeable elements so it can represent any desired one of a character group, e.g., any letter of the alphabet. Each display element comprises a molded two-piece housing body designed to pivotally support a rotatable magnetic display piece having a relatively visible light-showing or light-reflective face and a dark or non-visible face which can be moved selectively to a viewing position. Solenoid means individual for rotating each element show a desired face selectively, so that selected elements in any module as desired may be shifted either in unison, or preferably sequentially, to show individual display characters or symbols, such as a letter of the alphabet or an arabic numeral, etc. The light-showing face, per se, is designed preferably to operate essentially without electrical or other energy consumption. Access to mounting means for the elements on the base panel is provided by slightly truncating the corners of each housing body.
REFERENCES:
patent: 2740955 (1956-04-01), Barrett
patent: 3025512 (1962-03-01), Bloeche
patent: 3487403 (1969-12-01), Pihl
patent: 3530462 (1970-09-01), Hampel
patent: 3680083 (1972-07-01), Pihl
patent: 3742446 (1973-06-01), Wells et al.
Caldwell John W.
Wannisky William M.
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