B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
B61L 29/08 (2006.01) B61L 29/04 (2006.01)
Patent
CA 2255247
A railroad crossing gate electrical control system for moving a crossing gate in up and down directions also provides for raising the gate counterweights in a failure mode. The control system includes an electric motor having a plurality of electromagnet poles and an armature rotating inside of the poles, with armature movement controlling gate movement. There is a motor and snub relay having contacts connected to the armature and the motor poles. A terminal board has movable contacts which are connected to the motor and snub relay and to a relay coil for moving the contacts of the snub relay. A source of power is connected to the terminal board. The movable terminal board contacts control the application of power to the motor and snub relay coil and the motor and snub relay contacts for operating the motor to cause up and down gate movement. There is a maintenance relay having a coil connected through a normally open switch to the source of power. The maintenance relay has contacts thereof connectable to the source of power and the motor, whereby closure of the normally open switch powers the maintenance relay coil to cause the contacts thereof to directly connect the source of power to the motor to cause the gate counterweights to be raised by armature movement.
Dennison Associates
Safetran Systems Corporation
LandOfFree
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