Patent Application
20090056585
The invention relates to a device for lifting a tongue rail of a switch during switching of the tongue rail, including a roller holder for rollers or rolls, which is arranged laterally outside a slide chair within the surface of a sleeper facing the rails.
Devices of the initially defined kind are, for instance, known from AT 001448 U1. In that known device, the rollers are arranged in a roller support which is in turn fixed to the rail foot between adjacent sleepers. It is true that the subsequent attachment of such roller supports is extremely simple. Yet, maintenance operations and, in particular, tamping operations are impeded by the arrangement of the rollers between adjacent sleepers. In such cases, dismounting and remounting as well as readjusting operations are necessary.
From EP 851063 A1, a roller device of the initially mentioned type is known, in which the rollers are fixed to a sleeper along with a roller support by a plurality of screws. With an arrangement of that type, adjustment relative to the sliding surfaces of slide chairs is required such that the respectively correct height position has to be individually fixed during each mounting by the aid of intermediate plates or washers.
Also in the configuration known from DE 10116041 A1, the rollers are arranged in a manner that the space between adjacent sleepers is kept free for maintenance operations on the track bed. There, the fixation is, however, effected to a separate support, which is itself, in turn, fixed to the stock rail so as to again involve high mounting and adjustment expenditures.
From DE 102004004784 A1, an integrated roller device has become known, which is arranged in a specially designed rib plate, wherein also the sliding surface of a slide chair is additionally defined on the rib plate laterally of the roller device. The roller device in that case can each be accordingly fixed to a plurality of bores of the rib plate in an oriented manner by the aid of a plurality of screws in order to enable appropriate adjustment. For the correct position, at least two screws and two oblong holes are, however, provided to ensure that the tongue rail will no longer rest on the rollers in its closed position. A subsequent installation of such roller devices calls for the complete exchange of the rib plate and cumbersome adaptation work.
The invention aims to provide a simple roller device whose installation is readily feasible without cumbersome adaptation work by a single screw connection in the space available beside the slide chair and within the width of a sleeper, without lateral parts projecting into the region between adjacent sleepers.
To solve this object, the device according to the invention of the initially defined kind essentially consists in that the roller holder is connected with a flange carrying a stop bar for fixation to the rib plate, and that the stop bar laterally bears against an edge of the rib plate in the position connected with the rib plate. Due to the fact that a roller holder is connected with a flange carrying a stop bar and intended for fixing a rib plate, an appropriate oblong hole can be provided in such a flange so as to enable an appropriate fixation by a single screw, which is immersed in a respective bore of the rib plate optionally made subsequently. However, since such a screw connection using but a single screw would not safely prevent the rollers from laterally pivoting about the axis formed by the screw, the configuration, with a view to providing the required stability and securement of the selected position, is devised such that the flange carries a stop bar, which comes to bear against the side edge of the rib plate after screwing down. This stop bar, along with the screw fixation, will thus secure the flange, and hence the roller holder, against pivoting about the screw axis, so that a single screw enables not only the adjustment of the respective position relative to the stock rail but, at the same time, also provides a securement against rotation or pivoting, and hence a positional securement. The device according to the invention is also suitable for subsequent installation, since it will merely do to make a single screw hole in the rib plate at a suitable distance and provide the same with a thread in order to ensure the respective fixation in the correct position. In special cases, it may merely be necessary in the vertical direction to adapt the lower edge of the roller holder accordingly in order to ensure close abutment of the roller holder.
In a particularly simple manner, the roller holder is designed such that the roller holder comprises two cheeks extending transversely to the longitudinal direction of the rail and intended for abutment on the rib plate to accommodate the axes or shafts of the rollers or rolls, which are connected with the flange. A particularly stable construction will be achieved, if the configuration is devised such that the roller holder is designed as an upwardly open frame or box resting on the rib plate. Such a box can be produced as a casting and, in any event, exhibits the appropriate torsional strength even if the fixation via a flange is only effected in one point of the rib plate, whereby pivoting about the axis of fixation will, at the same time, be impeded or prevented by the stop bar. This casting may be particularly low-structured, since the attachment to the flange is effected outside the frame or box of the roller holder such that the roller holder can to the greatest extent possible rest on the surface of the rib plate, to which also the sliding parts of the slide chair are fixed in a conventional manner. Due to this low construction, no special adaptations relative to conventional rib plates are required.
In order to safeguard, in such a construction, that the penetration of contaminates will not affect its functioning, and to ensure the removal of such contaminates from the frame or box, the configuration is advantageously devised such that the cheeks have recesses on their lower edges facing the rib plate.
The correct adjustment relative to the stock rail, or the position in which the tongue rail is to bear against the stock rail, will be safeguarded in a particularly simple manner in that the flange has an oblong hole for receiving a locking bolt or a screw. Together with the stop bar bearing against the side edge of the rib plate and constituting an anti-rotation protection, this results in the compact-structured roller device being very easily mountable to the rib plate in the freely available space, since only one fixing bore is required for the positional fixation.
In order to ensure the anti-rotation securement in small constructions even relative to large rotational forces, the configuration is advantageously devised such that the oblong hole is shorter than the length of the stop bar, measured in the direction transverse to the longitudinal direction of the rail. The stop bar is thus substantially longer than the oblong hole and able to safely take up even high rotational forces without enabling any twisting or pivoting.
In order to avoid the penetration of dirt or the like, it is feasible in a particularly simple manner to clamp a cover over the casting so as to leave free only the upper subregions of the roller bodies contacting the tongue rail. In this respect, the configuration is preferably devised such that a slip-on cover element overlapping the cheeks, the frame or the box and including openings for the rollers or rolls is provided.
For optionally required adaptations in different heights of the slide chair, it will, as a rule, suffice to appropriately work on the two bearing surfaces of the roller holder in order to ensure a close abutment.
In a further preferred embodiment, a roller device comprising a spring-mounted roller is provided for the rear adjustment region of the tongue rail, in which only a slight transverse movement of the tongue occurs. To this end, a spring is loosely inserted into the roller device during mounting and a link comprising a premounted roller is installed. The spring is dimensioned in such a manner as to ensure the safe spring deflection during the passage of a train so as to avoid any load on the roller during such a passage. A mechanical stop can, furthermore, be provided to limit the deflection.
In the following, the invention will be explained in more detail by way of an exemplary embodiment schematically illustrated in the drawing. Therein,
In the illustration according to
From the top view of
From the sectional illustration according to
| Number | Date | Country | Kind |
|---|---|---|---|
| GM 108/2006 | Feb 2006 | AT | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/AT2007/000033 | 1/26/2007 | WO | 00 | 8/6/2008 |
