Railway switches and signals – Electric automatic highway signals – mine doors – and gates
Patent
1977-02-22
1978-05-23
Blix, Trygve M.
Railway switches and signals
Electric automatic highway signals, mine doors, and gates
49140, 246489, 340 47, B61L 2908
Patent
active
040906850
ABSTRACT:
This disclosure relates to a railroad-highway crossing gate and signal arrangement having an elongated aluminum gate arm movable between a vertical clear position and a horizontal traffic blocking position. The elongated aluminum gate arm is attached by a breakaway connector to a gate arm bracket which is connected to one end of a pair of gate arm support members. A pair of adjustable counterweights are securely attached to the other end of the gate arm support members. A power operating mechanism including a permanent magnet d.c. motor and a gear train rotatably drives an output shaft which has its respective ends attached to the pair of gate arm support members for moving the aluminum gate arm between its horizontal and vertical positions. The d.c. motor is provided with at least one shaft extension portion for receiving ratchet wrenches for manually moving the gate between its clear and blocking positions and for receiving a torque measuring device for determining the torque that is required to lift the gate arm from its horizontal position to its vertical position and for establishing torque that freely moves the gate arm from its vertical position toward its horizontal position.
REFERENCES:
patent: 1243056 (1917-10-01), Fowler
patent: 2295419 (1942-09-01), Miskelly
patent: 2488313 (1949-11-01), Miskelly
patent: 2621544 (1952-12-01), Rossmann
patent: 3038991 (1962-06-01), Swanton
patent: 3394498 (1968-07-01), Reinitz
patent: 3932793 (1976-01-01), Muller
patent: 4006629 (1977-02-01), Barrett
Blix Trygve M.
Eisenzopf Reinhard J.
McIntire, Jr. R. W.
Sotak J. B.
Westinghouse Air Brake Company
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