Railway switches and signals – Vehicle-energy actuation – Continuous-rail frogs
Reexamination Certificate
2000-03-09
2001-08-21
Le, Mark T. (Department: 3617)
Railway switches and signals
Vehicle-energy actuation
Continuous-rail frogs
Reexamination Certificate
active
06276642
ABSTRACT:
CROSS-REFERENCES
None.
FIELD OF THE INVENTION
This invention relates generally to railroad system trackworks, and particularly concerns an improved railroad spring wing rail frog assembly having an advantageous low-profile, hold-open/hold-down subassembly co-operably attached to the assembly spring wing rail.
BACKGROUND OF THE INVENTIONS
It heretofore has been the practice in the United States in connection with railroad trackwork systems having spring wing rail frog assemblies with multiple adjunct devices such as conventional spring wing rail hold-down devices and conventional spring wing rail hold-open devices to mount such devices at separate but adjacent individual trackwork roadbed tie locations or on bridge plates which span the crib areas between the involved tie locations. Such practice has led to a number of relatively simple yet hazardous operating problems.
We have discovered a construction for railroad spring wing rail frog assemblies that avoids the prior practice problems and that is essentially involves low-cost to implement and especially efficient in its operation compared to a conventional hold-down and combined hold-open installation.
Other advantages and objectives of the present invention will become apparent during consideration of the descriptions which follow and the included drawings.
SUMMARY OF THE INVENTION
The frog assembly of the present invention includes a base plate element, a frog spring wing rail element supported by and laterally movable relative to the base plate element, an attach fitting rigidly secured to the spring wing rail element and having an integral low-profile hold-down horn, and a hold-open device pivotally connected to the attach fitting and positioned both immediately above and longitudinally beyond the hold-down horn to thereby provide the assembly with a low vertical profile.
REFERENCES:
patent: 5544848 (1996-08-01), Kuhn et al.
patent: 5595361 (1997-01-01), Remington et al.
patent: 6138958 (2000-10-01), Iric et al.
Kuhn Stephen R.
Young Keith
ABC-Naco Inc.
Baker, Jr. Thomas S.
Le Mark T.
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