Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Tunnelling shields and like moveable apparatus










Image Number 2 for United States Patent #4273468.

Corrections to be applied to the motion of a tunnelling shield to maintain or restore motion of the shield along a predetermined path are determined by directing a beam of collimated light in a direction parallel to or at a fixed angle with the axis of said predetermined path; focussing the beam on to the input end of an optical cable carried by the shield and comprising a plurality of optical fibres, the input ends of the fibres being arranged in an array in which the position of the input end of each guide relative to that of another is fixed; and displaying light transmitted through the optical cable or guides on to a screen at which the output ends of the guides are so arranged as to facilitate ready determination of any correction required to be applied to the motion of the shield. The method may be employed to indicate which propulsion rams of a tunnelling shield should be operated to apply the necessary correction to the motion of the shield.








 
 
  Recently Added Patents
System and method for agitation of multiple specimen containers
System, method and program recording medium for supply capacity estimation
Probe for ultrasound diagnostic apparatus
Piperazinedione compounds
Sink
Automated user interface adjustment
TPO compositions, articles, and methods of making the same
  Randomly Featured Patents
Solid state imaging device having electromagnetic wave absorber attached to a mounting board
Light biassed camera tube arrangements
Silver halide photographic material comprising doped divalent metal
High-speed, low DC power, PNP-loaded word line decorder/driver circuit
2-Hydroxyoxanilic acid derivatives
Smart-channel: learning-capable television channel changing apparatus, system and method
CDMA mobile communication receiving apparatus
Methods of etching insulative materials, of forming electrical devices, and of forming capacitors
Mufflers for use with engine retarders; and methods
Powder coating composition