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
Method of allocating IP address of image forming apparatus using DHCP, image forming apparatus and system of allocating IP address using DHCP
Device to control force required to depress accelerator pedal
Radio communication system, transmission apparatus, reception apparatus, and radio communication method in radio communication
Policy based cryptographic application programming interface in secure memory
Surface emitting laser device, surface emitting laser array, optical scanning device, and image forming apparatus
System and method for redundant array copy removal in a pointer-free language
Therapeutic compositions and methods
  Randomly Featured Patents
Virtual display headset
Mixtures of azodicarbonamide and .alpha.-amidosulphones and their production and use as a blowing agent
Method and system for interactively determining and displaying geometric relationship between three dimensional objects based on predetermined geometric constraints and position of an input de
Method and program product for modeling circuits with latch based design
Electrical connector having board retention means
Compact computer housing
Compact electrochemical cell for gas detection
Liquid supply apparatuses and liquid containers
Method and apparatus for the operation of a cell stack assembly during subfreezing temperatures
Power unit with reciprocating linear movement based on stirling motor, and method used in said power plant