Bi-directionally dynamically braked gate crossing mechanism...

Details Bi-directionally dynamically braked gate crossing mechanism... Bi-directionally dynamically braked gate crossing mechanism...

B - Operations, Transporting

61

L

B61L 29/04 (2006.01) B61L 29/08 (2006.01) H02P 5/06 (2000.01)

Patent

CA 2300566

The output voltage of a D.C. motor used to raise and lower a railroad crossing gate is monitored to detect when the D.C. motor begins to generate power, indicating that the motor is being driven by a rising gate arm. If the motor generates power above a adjustable predetermined value, the gate arm mechanism is considered to be operating too fast whereupon an impedance is shunted across the motor's armature thereby applying a load to the generating motor. The electrical load causes the motor to act as a dynamic brake slowing the gate arm mechanism operation and reducing the likelihood that the mechanical components of the crossing gate arm mechanism will be damaged.

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