Railways: surface track – Rails
Reexamination Certificate
1999-02-22
2001-08-07
Morano, S. Joseph (Department: 3617)
Railways: surface track
Rails
C238S125000
Reexamination Certificate
active
06270018
ABSTRACT:
The invention relates to a track having a rail track section diverging from the usual basic course, in particular a stock rail altered in its course by being led away from a track centerline. The invention further relates to a process for aligning a rail track section to a course alteration purposefully diverging from the basic course of the track, in particular for providing a course alteration for avoidance of an abrading movement between wheels of rolling stock traversing the track and the rail track section by changing the wheel contact point on the rail.
An array for controlled guidance of a wheel axis or bogie of rolling stock traversing a switch is known from EP 0 295 573 B1. To permit a substantially pure rolling movement between the wheel and the tail in the transition area between stock rail and tongue, while ensuring optimum travel comfort, it is proposed that at least the course of a stock rail in the area of the switch diverges from the basic course such that the wheel contact point is influenced effectively for a purposeful alignment of the wheel axis/bogie axis to the track longitudinal axis or median between main and secondary track in such a way that an abrading movement between wheel and rail is largely avoided. The purposeful course alteration is preferably achieved in that the stock rail is led away from the track center-line. The track center-line can here follow a straight or a curve if the switch itself is in the curve of a track. Depending on the curvature radius or length of the switch, the depth of the protrusion can be between 5 and 30 mm. Due to the minor divergence from the basic course, work must be with high precision to set the required course alteration and hence prevent an abrading movement between the wheel and the rail.
The problem underlying the present invention is to develop a track or process for aligning a rail track section of the type mentioned at the outset such that a precise alignment of the course of the rail track section can be checked with measures of simple design.
The problem is solved in accordance with the invention in that the rail track section has a cutout in the longitudinal direction of the track and parallel to the basic course of the latter whose course when the rail track section is arranged parallel to the basic course is inversely the same to the required course alteration.
In accordance with the invention, the rail track section to be subjected to a required course alteration is first aligned parallel to the basic course in order to then provide, for example by milling, a cutout such as a groove in the longitudinal direction, preferably in the rail head, and on that side opposite the running edge, the depth of which cutout varies depending on the required course alteration, namely following a curvature that runs opposite to that in the installed state of the rail track section. As a result of this, it is now necessary when installing the rail track section to have an alignment such that the cutout runs parallel to a measurement straight with its surface that is parallel to the running edge or rail web, the rail track section having undergone the required course alteration corresponding to the alignment of the reference surface of the cutout such as a groove bottom on a straight—or curve.
Since the cutout such as a groove has its greatest depth in the area of the required maximum course alteration, there should then be no limiting wall on the running surface side when this cutout is provided in the rail head, so that rail material cannot break out. Additionally and in a particularly noteworthy embodiment of the design, this cutout should rise in the direction of the rail head running surface as the groove depth increases.
In particular when the cutout runs in a rail head side flank, it is provided that it starts at the beginning of the course alteration of the rail track section approximately 10 to 20 mm, preferably 12 to 16 mm, in particular approximately 14 mm below the rail head running surface. In the area of the maximum course alteration of the rail track section, the cutout should have, in its limiting wall parallel to the rail web, a distance to the rail head running surface of 5 to 5.5 mm, based on a maximum course alteration relative to a basic course in the form of a straight of 10 to 20 mm.
Accordingly, the cutout permitting in simple manner a check of the required course alteration should be a step machined, for example milled, out of the rail head flank, said step having a side limiting surface that is vertical to the rail web and whose bottom surface running vertical or nearly vertical to the side limiting surface extends as far as the upper side of the rail head.
The process for aligning a rail track section of the type described above is characterized in accordance with the invention by the following process steps:
aligning of a rail track section parallel to the basic course,
provision of a cutout in the rail track section, where the cutout runs with its bottom opposite to the required course alteration relative to the basic course,
aligning of the section such that the cutout runs with its bottom parallel to the basic course, and
fixing of the rail track section.
To permit simple checking as to whether the course alteration follows the required geometry, it is furthermore provided that along the rail track section a measurement straight is disposed parallel to the basic course, that the distance between the measurement straight and the cutout or its bottom running parallel to the central axis of the rail track section is measured for alignment of the rail track section to the required course alteration, and that the rail track section has the required course alteration when the distance between the measurement straight and the cutout or its bottom is constant over the entire length of the rail track section.
The following description and drawing show a preferred embodiment of the invention:
In the drawing,
FIG. 1
shows a rail track section aligned with a normal basic course,
FIG. 2
shows the rail track section according to
FIG. 1
, but with changed course alteration,
FIG. 3
shows a section along the line A—A in
FIG. 1
,
FIG. 4
shows a section along the line G—G in
FIG. 1
, and
FIG. 5
shows a section along the line S—S in FIG.
1
.
REFERENCES:
patent: 193206 (1877-07-01), Ainsworth
patent: 391168 (1888-10-01), Mansfield
patent: 4965940 (1990-10-01), Wilson
Benenowski Sebastian
Kais Alfred
Zillien Burkhard
BWG Butzbacher Weichenbau GmbH & Co. KG
Dennison, Scheiner Schultz & Wakeman
McCarry, Jr. Robert J.
Morano S. Joseph
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