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
Perfume bottle
System and method for generating profile morphing using cephalometric tracing data
Global codebook for coordinated multi-point processing
Nonvolatile semiconductor storage device having conductive and insulative charge storage films
Trash receptacle
Shape memory polymers formed by self-crosslinking of copolymers
  Randomly Featured Patents
Semiconductor device having a capacitor
Electrical bicycle shift control device
Display device for illuminating optical storage disks for visual display and method of using the same
Murine monoclonal anti-idiotype antibody 11D10 and methods of use thereof
Educational toy
Joining machine for continuous loop abrasive bands
Power control interface between a wind farm and a power transmission system
Method of boarding passengers on regional aircraft and transferring passengers between a regional aircraft and larger aircraft
Oxygen-absorbing compositions and method
Electrophotographic photosensitive body and method of manufacturing same