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
Telephone relaying apparatus, telephone relaying method, and program
System and method for internet based procurement of goods and services
Browsing or searching user interfaces and other aspects
System and method for displaying a constant time selection context menu interface
Landscape post for solar and other light fixtures
Method and system for coordinating client and host security modules
Biological information monitoring system
  Randomly Featured Patents
Segmented pillar layout for a high-voltage vertical transistor
Portion of cushion for respiratory mask
Reactor for the catalytic ammonia synthesis at high temperatures and pressures
Method and apparatus for sender controllable modalities
Process of manufacturing authenticatable paper products
Wafer level pre-packaged flip chip
Remote communication system for use with a vehicle
Water closet
Control device for controlling drive force that operates on vehicle
Sight piece, in particular for skiing goggles and method for the manufacture thereof