Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Patent
1974-09-05
1976-02-03
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
200175, 200178, H01H 6704
Patent
active
039367819
ABSTRACT:
Selecting device for crossbar switches of the type where selecting wires are actuated by selecting bars, which execute twisting movements by means of selecting bar magnets, for selection of predetermined contact groups. After selection, these contact groups can be actuated by lifting devices, which move in a direction mainly parallel to the selecting bars, on operation of bridge magnets, due to transfer of the movements of the lifting device to the contact groups via the actuated selecting wires. According to the invention the selecting wires are flexible and bent to a symmetrical loop with two legs. Each selecting wire is movably supported in such a manner that it encircles the respective selecting bar and the legs can swing around an axis mainly parallel to said axis of rotation of the selecting bar. Inner and outer stops are arranged such that the legs, when not actuated, rest against the inner stops and, when actuated, are pressed against the outer stops. For actuation of the selecting wires the selecting bars are provided with selecting wings which in the uninfluenced condition occupy a position midway between the legs of the respective selecting wires, when the latter rest against the inner stops.
REFERENCES:
patent: 2120408 (1938-06-01), Hickman
patent: 2120413 (1938-06-01), Matthies
patent: 3445795 (1969-05-01), Holtfreter et al.
patent: 3673366 (1972-06-01), Symes
Broome Harold
Telefonaktiebolaget L M Ericsson
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