Push-button switch for a multifrequency dialling telephone set

Details Push-button switch for a multifrequency dialling telephone set Push-button switch for a multifrequency dialling telephone set

1976-11-01

1978-01-31

Claffy, Kathleen H.

H04M 150

Patent

active

040717151

ABSTRACT:
A push-button switch for a multifrequency dialling telephone set is described. By utilizing a connection group of three conducting reeds between the support plane and the telephone casing, at least two of which are rigid and rotatably mounted at one of their ends, the transmission duration of multifrequency signals associated with each push-button on the telephone line is accomplished with great accuracy. The pressure exerted on a selected push-button during a first phase of its stroke corresponding to the multifrequency signal selection issued from the multifrequency generator disconnected from the telephone line is lower than that during a second phase of its stroke corresponding to the multifrequency signal transmission from multifrequency generator to the telephone line. During the first phase, the downward pressure exerted on the pushbutton is directed against the differential force of the upward flexion stress of a first spring and the upward torsion stress of a second spring. During the second phase, the downward pressure exerted on the push-button is only directed against the stress of the first spring. At this end, each push-button is associated with a rigid conducting reed pivotably mounted at one end and only subjected to torsion stress of the second spring during the second phase. The two rotatably mounted reeds of the connection group are released by long and loose springs.

REFERENCES:
patent: 3080457 (1963-03-01), Jansson et al.
patent: 3355558 (1967-11-01), Geese et al.
patent: 3731030 (1973-05-01), Holzer
patent: 3731032 (1973-05-01), Schantz
patent: 3870840 (1975-03-01), Rivetta et al.
patent: 3896283 (1975-07-01), Hayden

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