Electricity: circuit makers and breakers – Multiple circuit control – Sequential operations
Patent
1978-01-03
1980-03-25
Scott, James R.
Electricity: circuit makers and breakers
Multiple circuit control
Sequential operations
179 90K, 200 5R, 200 17R, 200153LA, H01H 900, H04M 126
Patent
active
041952073
ABSTRACT:
A slide included in the push button set of a telephone instrument reciprocable to actuate a number of contact devices in the set. Each contact device comprises a pair of movable contact arms associated with fixed contacts. The slide is disposed between two oppositely situated contact assemblies and comprises an arm having two oppositely directed wedge members. Each member has a longitudinal center portions and is provided on each side with a rounded camming surface. The reciprocating action of the slide is effected by a push button on the set, one camming surface then contacting a flange on a movable contact arm thus establishing a contact between this arm and the associated fixed contact. The camming surfaces on both sides of the wedge member are displaced relative to each other to provide a sequential contact action.
REFERENCES:
patent: Re27863 (1974-01-01), Yano et al.
patent: 3120584 (1964-02-01), Grunfelder et al.
patent: 3227819 (1966-01-01), Winther
patent: 3676810 (1972-07-01), Machida
patent: 3706863 (1972-12-01), Britton et al.
patent: 4071715 (1978-01-01), Richard et al.
Scott James R.
Telefonaktiebolaget L M Ericsson
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