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
Mobile phone
Minimizing mismatch during compensation
Listing recommendation using generation of a user-specific query in a network-based commerce system
Switched capacitor hold-up scheme for constant boost output voltage
Sonic fast-sync system and method for bluetooth
Vehicle fender
Formwork release composition and use thereof
  Randomly Featured Patents
Preventive safety activation in a vehicle
Fender receptacle unit for a four wheel vehicle
Three-dimensional display and packaging device
Electronic ballast with parallel-tuned output circuit
Devices for generating detectable polymers
Suction control valve for left ventricle venting
Automated fluid handling system and method
Plasticized, heat-stabilized PVC compositions
Fireplace air distribution system
Directly induced swing for closed loop control of electroslag remelting furnace