Railroad frog assembly with multi-position holdback

Details Railroad frog assembly with multi-position holdback Railroad frog assembly with multi-position holdback

1999-02-17

2000-12-26

Morano, S. Joseph

Railway switches and signals

Switch-connected frogs

246275, 246276, 246257, 246274, 246389, 188 61, 188 31, E01B 710

Patent

active

061646024

ABSTRACT:
A railroad frog assembly is provided with a spring wing rail multi-position holdback subassembly that continuously retains the spring wing rail in each spring wing rail open position when activated by the wheels of a railcar traversing the frog assembly, and that automatically deactivates the multi-position holdback subassembly and releases the spring wing rail from retention in an open condition and for complete closing after the last railcar wheel has passed through the frog assembly.

REFERENCES:
patent: 552916 (1896-01-01), MacPherson
patent: 801440 (1905-10-01), Coleman
patent: 5417392 (1995-05-01), Wyatt
patent: 5687935 (1997-11-01), Durchschlag et al.
patent: 5806810 (1998-09-01), Young et al.
patent: 5988342 (1999-11-01), Ito et al.

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