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
System for targeted delivery of therapeutic agents
Optical navigation device with image sensor and inner housing
Sealing member for piezoelectric resonator device, and piezoelectric resonator device
Dryer
Pyrrolidine derivatives, pharmaceutical compositions containing the same, and methods of using the same
Process for preparing higher hydridosilanes
DL control channel structure enhancement
  Randomly Featured Patents
Dispensing system for double stack carton
Clock saver apparatus and methods
Process for producing laminated safety glass
POG holder and method
Address resolution method and asynchronous transfer mode network system
Method and apparatus for a contact start plasma cutting process
Apparatus and method for controlling a wave field synthesis renderer means with audio objects
Assembly for doorway illumination
Airbag inflator
Edge metal for interconnect layers