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
Auto-provisioning of network services over an Ethernet access link
Behavioral fingerprint based authentication
Method and apparatus for selective decoding in a wireless communication system
Cable exit trough with insert
Method for controlled layer transfer
Liquid crystal display device with a control mechanism for eliminating images
Method and system for calibrating laser profiling systems
  Randomly Featured Patents
Chalcogenide ion selective electrodes
Spinal fixation element and methods
Guard rail assembly
Reversible mount gate latch with manual latch locking
Narrow bodied, single- and twin-windowed portable laser scanning head for reading bar code symbols
Sunblock composition suitable for sensitive skin areas
Signature recognition system and method
Infectious plant viral vector and an artificial bipartite plant viral vector an infectious plant viral vector and an artificial bipartite plant viral vector
Apparatus to control airbag for side collision
Slide valve position indicator and magnetic coupler