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
Out-of-order load/store queue structure
Data processing apparatus including reconfigurable logic circuit
MEMS structure and method for making the same
System, apparatus, and method for fast startup of USB devices
Efficient file system metadata scanning using scoped snapshots
Liquid crystal display backlight control
High density molecular memory storage with read and write capabilities
  Randomly Featured Patents
Spring clip for a cooling device
Soccer kicking aid
Medical C-arm device provided with reinforced running surfaces
Detecting malicious alteration of stored computer files
Color separating backlight
Anode loop pressure control in PEM fuel cell system
Novel human growth hormone like protein HGH-V encoded in the human genome
Connection device of cable management arm
Multipole acoustic logging with azimuthal spatial transform filtering