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
Method and system for the assignment of security group information using a proxy
Associating objects in databases by rate-based tagging
Method and a channel estimating arrangement for performing channel estimation
Tuning peg for a stringed instrument
Process for preparing higher hydridosilanes
Method for increasing expression of active tumor necrosis factor receptor family member-Ig fusion proteins
Semiconductor device and method for manufacturing same
  Randomly Featured Patents
Glass frit composition for sealing window glass
Package with heat transfer
Advanced search algorithm with integrated business intelligence
OB receptor isoforms and nucleic acids encoding them
Drifting remotely controlled toy vehicle
Circuit interrupter
Tapered blade and holder for a meat skinning machine
Photographic material and process (A)
Dissolvable air freshener
Memory tag, read/write device and method of operating a memory tag