Dual function button

Details Dual function button Dual function button

1995-06-07

1996-10-15

Walczak, David J.

Electricity: circuit makers and breakers

Solid contact

Membrane type

200519, 200 5R, 200512, 200 1B, H01H 110

Patent

active

055645607

ABSTRACT:
A dual function button for keyboards and keypads. The button includes a first contact switch which is activated by a first manual pressure. The first contact switch is preferably formed by a resilient cover having a conductive pellet on its interior face, and a flexible substrate having spaced contacts below the pellet. The first manual pressure causes the pellet to impinge upon the spaced contacts, completing a first circuit. The button also includes a second contact switch which is activated by a second, greater, manual pressure. The second contact switch includes the resilient cover of the first switch, a rigid substrate mounting spaced contacts, and a flexible conductive dome mounted on the rigid substrate below the resilient cover. The second manual pressure will cause the dome to resiliently deform and impinge upon the contacts, closing a second circuit. In this manner two functions may be provided by a single switch. The two functions may advantageously be a dual-speed cursor control.

REFERENCES:
patent: 4527030 (1985-07-01), Oelsch
patent: 4540865 (1985-09-01), Calder
patent: 4659881 (1987-04-01), Dowe
patent: 4668843 (1987-05-01), Watanabe

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