Patents by Inventor Simeon Dontchev Zonkov

Simeon Dontchev Zonkov 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).

  • Sectional tool unit, particularly for tools with a cylindrical shank
    Patent number: 3989260
    Abstract: Tool holder for use with machine tools, the tool holder having two aligned cylindrical bores of different diameters, separated by a circumferential groove, which is in communication with a hole through the body of the tool holder through which hydraulic fluid can be supplied. The cylindrical shank of the tool has correspondingly two cylindrical surfaces of different diameters with conical shoulders, one of which is in the end of the shank, while the other connects the cylindrical surfaces. The relaxed diameters of both stepped holes in the tool holder are smaller than the diameters of both cylindrical surfaces of the cylindrical shaft of the tool, the tool shank being press fitted into the tool holder.
    Type: Grant
    Filed: October 4, 1974
    Date of Patent: November 2, 1976
    Assignee: DSO "ZMM"
    Inventors: Simeon Dontchev Zonkov, Alexander Yordanov Zarvenkov, Konstantin Kirilov Tchobanov, Nikolay Vassilev Baliev