Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1979-09-25
1981-06-02
Brigance, Gerald L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340365A, 200 5A, H01H 312
Patent
active
042713331
ABSTRACT:
A pushbutton dial assembly, particularly for a telephone handset, is in the form of a sandwich structure comprising a pushbutton member having a plurality of push buttons; a flexible transfer member having a plurality of actuating members, one for each push button, each actuating member having a domed portion extending away from the push button; a flexible contact member having a plurality of domed areas or bubbles, the domed areas extending towards the actuating members and in contact with the domed portions, the concave surface of each domed area having a conducting surface; a flexible insulating spacer member with apertures aligned with the domed areas; and a circuit member having a plurality of contact areas, a contact area aligned with each domed area, and a circuit pattern interconnecting the contact areas. Pressure on a pushbutton causes a domed portion to depress the related domed area which snaps through to make contact with the related contact area. The circuit member can be part of a flexible circuit member carrying electronic components. Grounding means are provided for by-passing static charges occurring on actuation of push button by a user.
REFERENCES:
patent: 3591749 (1971-07-01), Comstock
patent: 3617660 (1971-11-01), Krakinowski
patent: 3627930 (1971-12-01), Tolman
patent: 3707609 (1972-12-01), Dapot et al.
patent: 3725907 (1973-04-01), Boulanger
patent: 4033030 (1977-07-01), Robinson et al.
patent: 4040120 (1977-08-01), Geadan et al.
patent: 4124785 (1978-11-01), Seretny et al.
patent: 4128744 (1978-12-01), Seeger
"Force Concentrator for Touch Sensitive Panel Using Snap-Action Switches" IBM Technical Disclosure Bulletn, vol. 19, #1, p. 238 Jun. 1976.
Adams William J.
Wernet William F.
Brigance Gerald L.
Northern Telecom Inc.
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