Railway switches and signals – Electric automatic highway signals – mine doors – and gates
Patent
1974-09-23
1976-06-22
Blix, Trygve M.
Railway switches and signals
Electric automatic highway signals, mine doors, and gates
49138, 246261, 246272, 246293, B61L 2922
Patent
active
039647048
ABSTRACT:
The operating mechanism of a railroad crossing gate employs a variable mechanical advantage connection to transmit force from the drive motor to the gate member to raise and lower the same. The main shaft of the mechanism serves as a mount for the gate member and its counterweights, and an operating arm is fixed to the shaft and extends radially therefrom. A crank is driven by reduction gearing and is connected to the arm by a sliding coupling which reciprocates on the arm longitudinally thereof as the crank rotates. The axis of rotation of the crank is located such that the mechanical advantage is high when the gate member is in either its raised or its lowered position, decreasing to a ratio approaching unity at the midpoint of travel in either direction. Accordingly, the starting load is minimized, the gate member is accelerated once it is in motion, and its speed is then reduced as it nears the end of its travel. The crank and operating arm toggle when the gate member is in its lowered position to provide a positive mechanical lock.
REFERENCES:
patent: 1888058 (1932-11-01), Vincent
patent: 3038991 (1962-06-01), Swanton
patent: 3060312 (1962-10-01), Jackson
Blix Trygve M.
Chase D. A. N.
Eisenzopf Reinhard J.
Harmon Industries, Inc.
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