Railways – Track layers – Track raising car
Reexamination Certificate
2000-01-27
2001-07-17
Le, Mark T. (Department: 3617)
Railways
Track layers
Track raising car
C033S287000
Reexamination Certificate
active
06260485
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for correcting the position of a track comprised of two rails fastened to ties.
2. Description of the Prior Art
An article entitled “Leitcomputer fuer Stopfmaschinen” in the periodical “Der Eisenbahningenieur” 44 (1993) 9, pp. 570-574, describes a computer designated “ALC” for optimizing a method for correcting the position of a track. In this method, the operation of a track tamping machine may be controlled not only in response to a known desired geometry of the track but also in response to an unknown desired track geometry. For this purpose, the track tamping machine is advanced along the track to measure its position before the position is corrected, and a desired track position with corresponding correction values is derived from the measured existing track position by means of electronically smoothing existing position errors by versine compensation.
SUMMARY OF THE INVENTION
It is a primary object of this invention to provide a track position correcting method which is particularly useful for optimally eliminating extreme track position errors in short track sections.
The above and other objects are accomplished according to the invention with a method for correcting the position of a track comprised of two rails fastened to ties, which comprises the steps of measuring independently of each other the position of each rail of a track section to obtain and record an existing level by means of a computer and control unit, electronically smoothing existing level errors exceeding a selected tolerance limit to form a desired level, delimiting within the measured track section a sub-section to be brought to the desired level by fixing a starting point and an end point of the sub-section, positioning a tamping unit on a track tamping machine exactly at the starting point, limiting any rail lifting at the starting point to the level of an uncorrected track section adjacent the starting point, and bringing the sub-section to the desired level by lifting and tamping each rail independently of each other until the track sub-section is positioned at the desired level.
Combining these steps enables the position of relatively short sub-sections, which have extreme position errors beyond a selected tolerance limit, to be corrected without incurring the high costs of correcting the position of an entire track section. In this method, the track position errors are durably corrected, on the one hand, while the corrected sub-section is optimally matched to the average existing position of the contiguous track sections which have not been corrected, on the other hand. In this connection, it is essential, particularly in track curves with superelevations, to form a desired position for each rail independently of each other to avoid a warped track after the correction.
REFERENCES:
patent: 3875865 (1975-04-01), Plasser et al.
patent: 4497255 (1985-02-01), Theurer
patent: 5012413 (1991-04-01), Stroka et al.
“Leitcomputer fuer Stopfmaschinen” 44 in the periodical “Der Eisenbahningenieur” (1993) 9, pp. 570-574.
Lichtberger Bernhard
Theurer Josef
Collard & Roe P.C.
Franz Plasser Bahnbaumaschinen
Le Mark T.
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