Resources Contact Us Home
Method and device for controlling the trajectory of a shield-type tunnelling machine

Image Number 6 for United States Patent #4904115.

Method of controlling the trajectory of a shield-type tunnelling machine equipped with displacement control hydraulic rams (3), characterized in that, these rams being divided into at least three groups of rams (6A, 6B, 6C), the theoretical instantaneous flowrates of fluid to be applied to each of these groups are continuously determined (40) from the curvature characteristics and the overall rate of advance set point trajectory and these groups (7-26-27-28) are supplied with instantaneous flowrates, the values of which correspond to the theoretical values.

  Recently Added Patents
Biodegradable aliphatic-aromatic copolyester for use in nonwoven webs
Semiconductor device having a multilevel interconnect structure and method for fabricating the same
Web development environment that enables a developer to interact with run-time output presentation of a page
All-in-one information handling system
Active tags
Schottky diode and method of manufacture
Scanning optical positioning system with spatially triangulating receivers
  Randomly Featured Patents
Sliver discharge device
Cobalt Schiff base compounds
Indicator processor
Computer system having a refrigeration cycle utilizing an adsorber/desorber for purposes of compression
Multi-output-resistance switch driver circuits
Substituted diazolylalkyl-carbinols, a process for their preparation and their use as antimycotic agents
Semiconductor integrated circuit device
Coupling for a connector for fluid pipes with a metal wire spring
Parallel card table scanning and updating
Method of manufacturing electrode for lithium secondary cell