Railway switches and signals – Block-signal systems – Automatic
Patent
1983-12-29
1986-09-16
Reeves, Robert B.
Railway switches and signals
Block-signal systems
Automatic
246122R, 246220, B61L 1906
Patent
active
046117750
ABSTRACT:
A railway track switch, also known as a switch machine, is controlled by a microprocessor switch lock connected to the electric switch lock of the switch machine and permits the switch machine to be unlocked so that the track switch points may be thrown, as by a hand-throw mechanism, to permit movement of a train between main and secondary tracks. The switch lock is connected to a cut section repeater of the track circuit adjacent to the track switch. An overlay track circuit connected to the main tracks indicates occupancy in the vicinity of the track switch. The microprocessor receives signals from the repeater, the overlay circuit and the electric switch lock of the switch machine indicating track occupancy and requests to unlock the track switch so that the switch points may be moved. Signals are also received from a timer as to specific, selected delay times set by the user before unlocking the switch. An interface also controls the microprocessor to decode occupancy and other track codes, transmitted by the track circuits and received by the repeater, as are selected by the user to enable the apparatus to be used with any track circuit communication code protocol. The microprocessor cooperates with a hardwired counter and is programmed to provide continuous checks for vital operation.
REFERENCES:
patent: 4217643 (1980-08-01), Anderson et al.
patent: 4305556 (1981-12-01), Norton et al.
General Signal Corp.
Lukacher Martin
Reeves Robert B.
Wacyra Edward M.
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