Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Thwarting keyloggers using proxies
Sporting goal practice screen
Semiconductor device and manufacturing method thereof
Variants of a family 44 xyloglucanase
Pickup device and method for manufacturing the same
Method and apparatus for communications
Methods of saccharification of polysaccharides in plants
  Randomly Featured Patents
Structure for fitting a valve seat support ring in a valve port
Driving system for fan and method of driving fan
Fast-switching frequency synthesizer
Thermal printhead assembly
Power measurement mechanism for a transformer coupled plasma source
Methods and apparatus for repairing a rotor assembly of a turbine
Electrical connector structure
Process for isomerizing monochlorotoluenes or dichlorotoluenes
Tee-type valve for self-priming pump system
Method of preparing carboxylic acid chlorides of the benzene series