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
Droplet generation and detection device, and droplet control device
Electronic currency, electronic wallet therefor and electronic payment systems employing them
Beaconing and superframe structure for millimeter wave wireless technologies
Optical coherence tomography with multiple sample arms
System and method for configuring software applications in a motor vehicle
Method of operating an election ballot printing system
Automatic actuator for breakers or switches
  Randomly Featured Patents
Reciprocating cutting tool with orbital action
Portable box wine bar
Method and computer-readable medium for providing access to policy information associated with electronic mail message folders
Method and apparatus for automatically determining neighbor cells in a wireless telecommunication system
Multiprocessor control system for cycles, for example for competition bicycles
Vertical ecosystem structure
Electronic part-mounting component and electronic device
Sling assembly for carrying and stabilizing a crossbow
System for refurbishing the inside surface of a chamber
Method and apparatus for expanding graphics images for LCD panels