Railway switches and signals – Crossings – frogs – and mates – Flange-supported wheel
Patent
1976-01-02
1977-04-05
Kunin, Stephen G.
Railway switches and signals
Crossings, frogs, and mates
Flange-supported wheel
246427, 246432, E01B 712
Patent
active
040158055
ABSTRACT:
Railway switch for transferring railway vehicles from a main track to a siding and, respectively, crossing of a siding with a main track, the switch or crossing comprising a frog in which the rail of the main track is uninterrupted, noting that the portion of the rail of the siding located between the rails of a main track is ending adjacent the rail of the main track to leave a gap for the wheel flanges of the wheels travelling on the main track, that the rolling surface of the rail portion of the siding located between the rails of the main track is, in the area adjacent the rail of the main track, super-elevated relative to the rolling surface of the rail of the main track and that the portion of the rail of the siding located outside of the rails of the main track is provided with a ramp for ligting the wheel flanges, said ramp ascending until the height of the rolling surface of the main track, characterized in that the rolling surface of the portion of the rail of the siding located between the rails of the main track is located with its uppermost area at a greater height than the rolling surface of the rail of the main track for an amount corresponding at least to one half of the difference between the diameter of the wheel flange and the diameter of the rim of wheel subjected to maximally tolerable wear and is descending like a ramp in direction to the area adjacent the rail of the main track to a height which is greater for maximally one half of the difference between the diameter of the wheel flange and the rolling surface of the rim of a new wheel than the height of the rolling surface of the rail of the main track and is preferably approximately greater for one half of the difference.
REFERENCES:
patent: 346229 (1886-07-01), Shannon
patent: 511784 (1894-01-01), Meeker
patent: 1605716 (1926-11-01), Gilmour
patent: 1820586 (1931-08-01), Ulrich
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