Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Grip for a racket
High performance actuator motor
Managing a spinlock indicative of exclusive access to a system resource
Filtering method for improving the data quality of geometric tire measurements
Switchable memory diodes based on ferroelectric/conjugated polymer heterostructures and/or their composites
Non-volatile flash-RAM memory with magnetic memory
Method of forming micropattern, method of forming damascene metallization, and semiconductor device and semiconductor memory device fabricated using the same
  Randomly Featured Patents
Stirred-tank reactor system
Apparatus for mechanically adjusting lighting fixture azimuth and elevation
Upper for a shoe
Optical interconnect networks
Molding station with deformable mold and method
Apparatus for gapping a stringer chain
Hybrid pumping system for a downhole tool
Terminal and authorization card for a subscriber, telecommunications network, and method for modifying a service profile assigned to the subscriber
Low pressure measurement devices in high pressure environments
Photoelectric sensor and photoelectric sensor system for comparing received light levels to detect objects