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
Resuming piecewise calibration of a real-time-clock unit after a measured offset that begins at the next calibration period
Picture information coding device and coding method
Image forming apparatus with static elimination
Rotation angle sensor
Electrode for a plasma torch
Spectral measurement device
Deadline-driven parallel execution of queries
  Randomly Featured Patents
Use of dicalcium phosphate anhydride powder
Dust bag for animal insecticide
Digital-to-analog converter with digital correction
Winding, particularly for a high-voltage ignition coil circuit
Methods for managing aggregated address books
Device for mounting an electric blower drive motor on the housing of a heating, ventilating and/or air conditioning unit for vehicles
Method for variable density acidizing
Catalyst systems advantageous for high particulate matter environments
Method of forming building blocks using block press equipment having translating fluid injection apparatus