Highway crossing control

Details Highway crossing control Highway crossing control

1994-08-19

1996-03-26

Sircus, Brian

Electricity: motive power systems

Motor-reversing

Periodic- or intermittent-reversing

318286, 318293, 246128, H02P 706, B61L 108

Patent

active

055023673

ABSTRACT:
Highway crossing gate control circuit in which a permanent magnet motor is controlled to drive up and drive down the gate arm by utilization of a single motor control relay and controller contacts which sense the position of the gate arm. The motor polarity is reversed through utilization of the motor control relay, which is operated by a single up input signal. Provision is included for dynamic breaking on the arm moving downward after an initial drive down mode.

REFERENCES:
patent: 3601603 (1971-08-01), Hughson
patent: 3964704 (1976-06-01), Karr
patent: 4289995 (1981-09-01), Sorber et al.
patent: 4369943 (1983-01-01), Hussein
patent: 4614902 (1986-09-01), Jessup

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