Double-domed elastomeric keyboard element

Details Double-domed elastomeric keyboard element Double-domed elastomeric keyboard element

1981-08-27

1983-03-29

Shepperd, John W.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200340, H01H 1370

Patent

active

043784780

ABSTRACT:
A double-domed elastomeric keyboard element is disclosed in which a solid contact disc is connected to the junction of the domes of the keyboard element housing. The inner dome is provided on its inside with a downwardly extending projection which engages the contact disc when the keyboard element is depressed to press the disc against a pair of conductors on a printed circuit board below the element. Because of the non-positive connection between the key plunger and the conductors, the contact pressure is almost equal to the operating force.

REFERENCES:
patent: 3766350 (1973-10-01), Van Dyk et al.
patent: 3879586 (1975-04-01), DuRocher et al.
patent: 3898421 (1975-08-01), Suzumura
patent: 3932722 (1976-01-01), Obata et al.
patent: 3950627 (1976-04-01), Murata et al.
patent: 4127758 (1978-11-01), Lowthorp

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