Frog for switches

Details Frog for switches Frog for switches

1985-01-09

1986-05-20

Bertsch, Richard A.

Railway switches and signals

Switch-connected frogs

Center-pivoted rail

246434, 246468, 238230, 238281, 238282, E01B 714

Patent

active

045896178

ABSTRACT:
This invention relates to an improvement in a frog for switches, in particular for rapid transit switches, with a junction rail mounted in a rotatable manner and adapted to close a gap between pairs of rails of straight or branch track, the improvement comprising that the two ends of the junction rail have the shape of an isosceles triangle and the corresponding ends of a transit rail taper on one side, whereby a continuous rail-head profile is formed when the junction rail abuts the transit rail.

REFERENCES:
patent: 542253 (1895-07-01), Hamill
patent: 612273 (1898-10-01), Quigley
patent: 1011087 (1911-12-01), Smith
patent: 1132860 (1915-03-01), Livingston
patent: 1135375 (1915-04-01), Hamilton et al.
patent: 1309002 (1919-07-01), Walker
patent: 1488443 (1924-03-01), Schwier
patent: 2124804 (1938-07-01), Knight
patent: 3494553 (1970-02-01), Nelson
patent: 3618851 (1971-11-01), Smith
patent: 3757113 (1973-09-01), Dohse
patent: 4005839 (1977-01-01), Frank

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