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
Woven mesh substrate with semiconductor elements, and method and device for manufacturing the same
Communication system, authentication device, control server, communication method, and program
Masking method and apparatus
Method of sheet alignment and method of post-processing comprising the same and method of image formation
Image-processing method and program, and image-processing apparatus
Battery pack with interchangeable circuit substrates
  Randomly Featured Patents
Container for transporting heated food, particularly pizza and the like
Dental care device
Solar cell structure utilizing an amorphous silicon discrete by-pass diode
Leakproof seams for non-containable waterproof/breathable fabric composites
Methods and apparatus for sealing and analyzing material samples including uncompacted bituminous samples according to water displacement testing methods
Photosensitive composition
Method and device for treatment of cancer
Tool for loosening a seized ball joint in a motor vehicle
Electrocardiograph and blood pressure signals simulator