Patents by Inventor ALexandr Y. Tkachenko

ALexandr Y. Tkachenko has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Shield unit
    Patent number: 5072992
    Abstract: A shield unit has a cylindrical shell made up of two sections arranged in succession one after the other, that is, a head section and a tail section which are connected by a traversing mechanism. The mechanism is a differential planetary gear train kinematically associated with a mechanism for moving the tail section and a rock discharge mechanism. The head section is provided with a cutting tool and has a helical surface. The tail section is provided with a device preventing rotation of the tool section in rock.
    Type: Grant
    Filed: June 23, 1990
    Date of Patent: December 17, 1991
    Inventors: Valery F. Gorbunov, ALexandr F. Eller, ALexandr Y. Tkachenko, Vladimir V. Axenov, Vladimir D. Nagorny