Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Convolution filtering in a graphics processor
Method and apparatus for managing data of flash memory via address mapping
Method and apparatus for removing image blocking artifact by using transformation coefficient
Method for improving the comprehensibility of speech with a hearing aid, together with a hearing aid
Cross repository impact analysis using topic maps
Resistive random access memory cell and memory
Optical waveguide with cascaded modulator circuits
  Randomly Featured Patents
Mailing/filing system for congruently categorizing different types of electronic mail resources received through a messaging system
Sexual aid
Brownie cutter
2-(Methylthio)naphtho[1,3-bc]pyran-3(2H)-one
Component mounting method
Uplink transmit diversity enhancement
Composite cement retainer
Raw mixture for the production of refractory high-alumina cement
Adeno-associated virus capsid immunologic determinants
Semiconductor device and method for fabricating the same