Railway switches and signals – Crossings – frogs – and mates – Frogs
Patent
1994-05-03
1995-10-10
Le, Mark T.
Railway switches and signals
Crossings, frogs, and mates
Frogs
246460, 246472, E01B 700
Patent
active
054564301
ABSTRACT:
An improved frog is provided with an interchangeable insert for a railroad turnout, such as a frog or crossing. The frog has a new modular interchangeable insert, which permits easy changing of worn pieces in situ.
The insert is a solid, unitary piece of high strength steel of two different geometrical shapes. An upper part of the insert is triangular in shape having a flat or planar base surface. A lower part of the insert is of a rectangular, planar sided member of box shape and serves as the web, running from the front to rear of and through the center and beneath the triangular upper part.
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patent: 887847 (1908-05-01), Reinoehl et al.
patent: 889199 (1908-06-01), Canty
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American Railway Engineering Association, Plan No. 621-89, 1986.
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