Railway switches and signals – Crossings – frogs – and mates – Bolted
Patent
1995-04-11
1996-06-04
Le, Mark T.
Railway switches and signals
Crossings, frogs, and mates
Bolted
246470, E01B 700
Patent
active
055225705
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a rail section in the form of a frog comprising two rail sections and guard rails held apart by liners, where at least the frog is passed through by a sleeve surrounding a connecting element such as a bolt.
Frogs are provided at points or crossovers by intersections of rail tracks. There are single, double and triple frogs, although the single frog is most frequently found in simple points.
In the frog, the guiding surfaces of the intersecting rail tracks are interrupted. The rail tracks continuing on from the tongues are angled in the vicinity of the frog and are called guard rails. The two tracks continuing from the ends of the points converge towards the frog tip. The tip can comprise either normal rails (rail frog), specially constructed rails that are then partially welded (partial block frog), or made in one piece (block frog). The latter are used only rarely by the German Railways (DB).
In the case of frogs made flora rails, these latter are frequently welded. This can however result in drawbacks when hard-to-weld materials are to be connected. A further drawback is that extraneous material is present in the abutting surface. Surface decarburizations are also a drawback. Furthermore, the risk of cracking increases.
If the rail parts are not welded to one another, they are held together by connecting elements such as bolts. The drawback here however is that a relative movement between the rail parts takes place.
Various designs of frogs are shown in DE 548 749, DE 23 18 419, DE 81 05 454 U1 or DD 60 326.
SUMMARY OF THE INVENTION
The object underlying the present invention is to develop a frog of the type described at the outset such that rail parts connected to one another without welding cannot move relative to one another at least vertically to the longitudinal axis of the rail section.
The problem is substantially solved in accordance with the invention in that on the one hand in that the frog comprises unwelded rail sections and in that the sleeve passes without play through the rail sections and at least in some areas the liners are passed through free of play by the sleeve. The problem is further solved in that the frog comprises unwelded frog sections, and in that on the one hand said frog sections and on the other hand the liners arranged on both sides thereof holding apart the associated guard rails positively engage with one another by profiling provided in the longitudinal direction of the frog, said profiling comprising a serration formed by teeth extending from surfaces of the frog sections and the liners in contact with one another and being in play-free contact with their tooth flanks.
By the teachings in accordance with the invention, it is ensured by simple means that a relative movement vertical to the longitudinal axis cannot occur between the rail parts to be connected without welding being necessary in this connection area, in particular in the frog area passed through by the connecting element. In consequence, neither problems with surface decarburizations or crack formation nor problems from the presence of extraneous materials occur in the abutting surfaces. Also, the provision of such frog areas is less expensive.
Unwelded in this case means that in the connection area between guard rails and frog, i.e. in the area in which these elements are connected via the liners by means of a connecting element, the frog sections are not welded to one another. This does not however rule out that the tip, on the tongue side, or the normal rails, on the points end side, are welded on.
When the sleeve disposed without play is used, which rules out relative movement in any direction, this sleeve can be pressed or shrunk into the rail parts or liners.
It is thus possible for the frog sections and liners to be heated so that the sleeve can then be inserted. After cooling, the sleeve is pressed in, thereby ensuring the required absence of play.
Alternatively, it is also for example possible to cool the sleeve, so that it can then be inser
REFERENCES:
patent: 747955 (1903-12-01), Entwisle
patent: 834278 (1906-10-01), Entwisle
patent: 872473 (1907-12-01), Strong
patent: 902589 (1908-11-01), Lucas
patent: 1247879 (1917-11-01), Reed et al.
Benenowski Sebastian
Hohne Hubertus
Kais Alfred
Nuding Erich
BWG Butzbacher Weichenbau GmbH
Le Mark T.
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