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
Gas flow indicator
Generating package profiles in software package repositories using selective subsets of packages
Methods and apparatus for mitigating interference between co-located collaborating radios
Polyureas made from aminocrotonates and enaminones
Preferential selection of candidates for delta compression
Memory device and self interleaving method thereof
Method for producing a flexible composite elastomeric polyurethane skin
  Randomly Featured Patents
Polishing cloth
Zoom lens and image pickup device
Method for manufacturing a photosensor
Mechanism for rotationally moving a mirror
Computer security system
Device for dating notes
Method and device for determining the composition of a gas mixture of a fuel tank of a motor vehicle filled with CNG
Control of body electrical activity by magnetic fields
Passivation for integrated circuit sensors
Miniature armature relay