Resources Contact Us Home
Shield tunneling machine

Image Number 5 for United States Patent #5393172.

A shield tunneling machine comprises a shield body having a soil chamber, an inside chamber and a partition wall. The soil chamber has a conical peripheral surface converging gradually rearward. A crankshaft having an eccentric portion is rotatably supported by the partition wall at the center of the partition wall corresponding to the axis of the shield body. A cutter disc with roller bits is secured to a front end of the crankshaft, and a conical rotor is rotatably mounted on the eccentric portion of the crankshaft behind the cutter disc. Since the cutter disc is rotated at an increased rotary velocity by five to ten times as many as that of a cutter disc in a conventional shield tunneling machine, crushing of gravel can be efficiently carried out by the cutter disc with roller bits in cooperation with the conical rotor mounted on the crankshaft.

  Recently Added Patents
Container seal with removal tab and piercable holographic security seal
Gene detecting methods without using PCR
Image correction apparatus and image correction method
Information discovery based on investments in an invention network
Efficient file system object-based deduplication
Optical line terminal
Automatic detection of channel bandwidth
  Randomly Featured Patents
Method for utilizing waveform relaxation in computer-based simulation models
Apparatus for extracting foreign bodies and heavy parts from fiber material
Electrical contact having upper contact with thickened base portion
Technique for orienting and binding phage for bacteria detection
Methods for detecting cancer cells by using nucleic acid encoding for IGF-1 receptor interacting proteins
Support system having an interchangeable splice
Very-low melt flow thermoplastic composition for golf ball core layers
Glucose measuring assembly with a hydrogel
Acrylic containing friction materials