Railroad spring frog assembly

Details Railroad spring frog assembly Railroad spring frog assembly

1999-01-22

2001-05-01

Morano, S. Joseph (Department: 3617)

Railway switches and signals

Crossings, frogs, and mates

C246S417000

Reexamination Certificate

active

06224023

ABSTRACT:

FIELD OF THE INVENTION
This invention relates generally to railroad trackworks, and particularly concerns an improved trackwork frog assembly of the spring-rail type which is principally used at railroad trackwork turn-outs from main line track.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 5,810,298, issued in the names of Young et al. and assigned to the assignee of this application, discloses a railroad rail frog assembly which advantageously utilizes multiple, spaced-apart rail closer elements to minimize otherwise occurring spring wing rail distortion.
It has now been additionally discovered in connection with the utilization of such prior art trackwork spring rail-type frog assemblies that a single, rather than multiple, spring-type, rail-closer element may be utilized advantageously and with equal effectiveness if that single, spring-type rail-closer is provided with multiple, spaced-apart points of application of closing forces to the connected spring wing rail.
Other objects and advantages of the present discovery will become apparent during a careful consideration of the invention summary, description of the drawings, and detailed description which follow.
SUMMARY OF THE INVENTION
The novel railroad trackwork frog assembly of this invention is essentially comprised of a base plate element, a frog long point or V-point element fixedly secured to the base plate element, a fixed wing rail element also fixedly secured to the base plate element, a laterally movable spring wing rail element mounted on the base plate element and having a free end portion, and a single rail-closer spring element with a connected linkage having two points of force application relative to the spring wing rail element. In addition, the invention frog assembly may advantageously incorporate at least one conventional slide-horn holddown subassembly into the connected linkage, such holddown subassembly (or subassemblies) functioning to control or maintain proper spring wing rail cross-section vertical orientation at all times during spring wing rail lateral movement. Also, the invention frog assembly may optionally and advantageously include one or more conventional shock absorber subassemblies combined with the spring wing rail element.


REFERENCES:
patent: 514630 (1894-02-01), Stewart et al.
patent: 654039 (1900-07-01), Wharton
patent: 930709 (1909-08-01), Whiteman
patent: 1784211 (1930-12-01), Vissat
patent: 4624428 (1986-11-01), Frank
patent: 5292091 (1994-03-01), Callegari et al.
patent: 5782437 (1998-07-01), Irie et al.
patent: 5810298 (1998-09-01), Young et al.

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