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
Method and system for diagnosing operating states of a production facility
Memory device including transistor array with shared plate channel and method for making the same
Systems and methods for using code space in spread-spectrum communications
Audio signal transformatting
Providing dispersed storage network location information of a hypertext markup language file
Receptor holding device
Vending machine with automated detection of product position
  Randomly Featured Patents
Tilt sensor and method for determining the tilt of a vehicle
Grooming and dispensing brush
Image display device
Method of rate snooping in a SAS/SATA environment
Sheet-shaped electrode, method of producing the same, and secondary battery using the sheet-shaped electrode
Table tennis net assembly
combustion wick for liquid fuel combustion appliance
Color liquid crystal projector device
Ring binder having actuating lever with cushion member
Semiconductor chip package and multichip package