H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/106
H04M 1/23 (2006.01) H01H 13/702 (2006.01)
Patent
CA 1135888
PUSHBUTTON DIAL ASSEMBLY Abstract of the Disclosure 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 a push button by a user. - i -
355659
Adams William J.
Wernet William F.
Jelly Sidney Thomas
Northern Telecom Inc.
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