Coordinate switch for telephone exchanges - has two excitation coils in magnetically shorted circuit forming part of actuating circuit

摘要

The cross points of the telephone exchange co-ordinate switch are provided each with contact mechanism, pre-magnetised by a permanent magnet and actuated by two electromagnetic excitation coils (17, 18). The coils generate opposite magnetic fluxes in a magnetically shorted circuit (1, 14, 15, 16). The shorted circuit forms part of a flux circuit (1, 2, 13, 14, 15, 16) for actuating the contact mechanism (2). The excitation coils of one flux direction are energised within a row of the co-ordinate switch, while the excitation coils of the other flux direction are energised within a line. Preferably the permanent magnet is incorporated in the flux circuit for the contact mechanism actuation.