Resources Contact Us Home
Tunnel excavating machine

Image Number 3 for United States Patent #6644754.

A tunnel excavating machine having an excavating machine body can be moved forward by shield jacks. A rotatable cutter head is mounted in a front portion of the excavating machine body. An erector device for assembling segments in a ring form is mounted in a rear portion of the excavating machine body. A rest extends rearward from the rear portion of the excavating machine body. A shape retainer for making pressurized contact with inner peripheral surfaces of the assembled segments to retain the segments in a predetermined shape is supported on the rest so as to be movable along a fore-and-aft direction. Also, a revolving frame is located between the erector device and the shape retainer, and supported on the rest so as to be movable along the fore-and-aft direction such that the revolving frame does not interfere with the erector device and the shape retainer. A cage is supported on the revolving frame so as to be revolvable in a circumferential direction of an existing tunnel.

  Recently Added Patents
RF amplifier with digital filter for polar transmitter
Efficient forward ranking in a search engine
Methods and systems for presenting an inhalation experience
Fluid conduit with PTC fabric heating
Compact semiconductor memory device having reduced number of contacts, methods of operating and methods of making
Position and orientation measurement apparatus, position and orientation measurement method, and storage medium
Modification of an object replica
  Randomly Featured Patents
Method and apparatus for measuring health and performance of a messaging system
Equalizing circuit for reproduced signals
Fine lead alloy wire for forming bump electrodes
Implantable access devices
Methods and systems for recovering a failed print job
Processor of video signal and display unit using the same
Method and apparatus for noise rejection in atrial arrhythmia detection
Antiviral agent comprising CD4 and H2 histone
Intelligent switch for connecting power to a load
Method for fabricating semiconductor device