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
Controller with screen
Biosensor kit
Method and system for billing based on color component histograms
Sensor packages and method of packaging dies of differing sizes
Method for exchanging data concerning an electronic transaction
Engine RPM control device
Print system
  Randomly Featured Patents
Wireless packet communication method and wireless packet communication apparatus
Torch fuel delivery system and burner
Therapeutic glasses and method for using the same
Method and apparatus for mounting an electrolytic cell
Isolation of the biosynthesis genes for pseudo-oligosaccharides from streptomyces glaucescens GLA.O, and their use
NMR spectrometer with superconducting coil having rectangular cross-section wire
Pouch having a branched chamber
Rotatable carrying handle arrangement
Methods for treating disorders associated with the central nervous system using opticallly pure (+) cisapride
Anionic polymers composed of dicarboxylic acids and uses thereof