Pushbutton keyboard assembly having pole and inner contacts simu

Details Pushbutton keyboard assembly having pole and inner contacts simu Pushbutton keyboard assembly having pole and inner contacts simu

1975-02-03

1976-08-03

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, 200275, H01H 1370, H01H 106

Patent

active

039730913

ABSTRACT:
A keyboard system for an electronic pocket calculator, remote TV tuner or the like comprises a substrate board having a generally flat surface with a network of circuit paths thereon. The board is provided with switch contacts at a plurality of switching stations. The switch contacts comprise at least one inner and outer contact for each switch station with the top surface of the outer contact spaced from the substrate a greater distance than the top surface of the inner contact. A switch actuating electrically conductive disc is placed over each switch station and is resiliently deformable into a position in which the disc bridges the outer and inner contacts to thereby complete a circuit therebetwen. In several embodiments switching stations are shown comprising an outer contact on which the outer margin of the electrically conductive disc is in contact both in the actuated and unactuated position while other embodiments comprise a disc support whch maintains the disc out of contact with both the outer and inner contacts in the unactuated position. The latter arrangement is particularly useful in providing multipole switching stations. A sheet of flexible insulative material may be adhesively bonded to the keyboard and to the outer faces of the discs for securing the discs in position relative to their respective contact portions for permitting the discs to be deformed to their actuated positions and for sealing the discs to the board.

REFERENCES:
patent: 3600528 (1971-08-01), Leposauic
patent: 3684842 (1972-08-01), Boulanger
patent: 3725907 (1973-04-01), Boulanger
patent: 3749859 (1973-07-01), Webb et al.
patent: 3796843 (1974-03-01), Durkee et al.
patent: 3806673 (1974-04-01), Boulanger
patent: 3808384 (1974-04-01), Boulanger

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