Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1980-06-16
1982-05-25
Smith, Jr., David
Electricity: circuit makers and breakers
Liquid contact
Time delay
200302, 200 5A, H01H 1344
Patent
active
043318517
ABSTRACT:
A printed circuit board is shown having a plurality of data input devices disposed on a face of the board and spaced from one another at selected distances. Each data input device comprises a housing having a flexible electrically conductive disc disposed therein and adapted upon flexure to close a selected circuit path on the board. A flexible gasket is received over an open end of the housing and is captured between the housing and a cover attached thereto. The cover is provided with an aperture therethrough to provide access for a motion transfer member operatively connected to a key member or, alternatively, to permit the button portion of a key member captured between the cover and the gasket to extend therethrough. Stand-off surfaces project from the housing to space the housing from the board to facilitate flushing of the board.
REFERENCES:
patent: 2262777 (1941-11-01), Roper
patent: 3133170 (1964-05-01), Nanninga
patent: 3602677 (1971-08-01), Adelson et al.
patent: 3707611 (1972-12-01), Twyford
patent: 3982089 (1976-09-01), Hyltin
patent: 4005293 (1977-01-01), Borlanger
patent: 4074088 (1978-02-01), Keough et al.
Haug John A.
McAndrews James P.
Scott J. R.
Sharp Melvin
Smith Jr. David
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