Resources Contact Us Home
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
Extensible, filtered lists for mobile device user interface
Repeating frame battery with joining of cell tabs via welded-on male and female slip-fit connectors
XDSL system and signal transmission method, sending device, and receiving device of xDSL system
Imidazole derivatives used as TAFIa inhibitors
Method and apparatus for information exchange over a web based environment
Managing distributed applications using structural diagrams
  Randomly Featured Patents
Spark plug for use in internal combustion engine
Base for a device
Method and apparatus for photographic analysis of dental restorations
Sensing device for ascertaining imaging errors
Bottle cap with integral measuring cup and bottle closure
Substituted heterocyclic compounds useful as inhibitors of (serine proteases) human neutrophil elastase
Forming self-healing insulation for magnet wire
4-phenylpiperidine compounds
(2-imidazolin-2-yl) fused heteropyridine compounds intermediates for the preparation of and use of said compounds as herbicidal agents
Fireplace closure