Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Waveform encoding for wireless applications
Hand truck brake
Header region evaluation circuit, optical disk apparatus, and header region evaluation method
Vanilloid receptor ligands, pharmaceutical compositions containing them, process for making them, and use thereof for treating pain and other conditions
Semiconductor device and method of formation
Electrostatic discharge (ESD) protection device
Adjustable scaffold base
  Randomly Featured Patents
Cryopreservation system with controlled dendritic freezing front velocity
Plug movable to a plurality of positions depending upon characteristics of a load device
Voice-data integrated multiaccess by self-reservation and stabilized aloha contention
Container filling employing anti-vacuum foot valve
Method for localizing allantoic fluid of avian eggs
Organic electroluminescence element
Microcapillary devices using high dielectric constant materials and related methods
Phosphoramidate alkylator prodrugs for the treatment of cancer
Degradable microcapsules
Method of repairing a seal jointing fitting repair