Resources Contact Us Home
Process for repairing or laying a railroad track

Image Number 3 for United States Patent #4724653.

A levelling and shifting machine and a transmitter system (1) are used, the latter being installed on a carriage parked on the track and transmitting a spreading beam in the horizontal plane for levelling and a spreading beam in the vertical plane (Fr) for shifting, these beams defining an absolute measuring base. The receivers for levelling and shifting, which are installed on a measuring carriage of the machine, are designed for self-centering relative to the line of incidence of one of the said beams or the other during each measurement. In a curve of the track (3), the vertical beam (Fr) defines a cord of this curve, and the set position of the receiver defines the current value of the pitch of the curve (fm.sub.0, fm.sub.1 etc). A computer calculates the desired value of the pitch (f.sub.0, f.sub.1 etc.) and the variation (y.sub.0, Y.sub.1 etc.) between the two values, the latter variation determining the shifting correction.The measuring interval (G') covered by the machine without a change in the position of the transmitter (1) is selected greater than the length (G) of the cord, and the initial measuring point (A.sub.0) is selected on the secant passing through the cord beyond the point of intersection of the beam (Fr) and the track (3), so that the sum of the maximum pitches towards one side and the other is compatible with the travel of the receiver on its measuring carriage.

  Recently Added Patents
Method for combining images and magnetic resonance scanner
Patient interface
Protocol delay measuring device and protocol delay measuring method
Resonant conversion system with over-current protection processes
High-performance AHCI interface
Image forming apparatus
Voltage regulators with improved wake-up response
  Randomly Featured Patents
Automotive vehicle and method for charging/discharging a power storage unit therein
System for storing an additive solution and injecting it into the exhaust gases of an engine
Coriolis mass flow meter and method for compensation of transmission errors of its input circuit
Bifocal lens which positions within the anterior chamber
Method of making a photovoltaic panel
Cylinder-mounted oxygen management device
Squat stand
Card game
Folding chair
Picture display device with interference suppression means