Patents Assigned to Kawamura Co., Ltd.
  • Inside chuck device for machine tools
    Patent number: 4541315
    Abstract: An inside chuck device for machine tools, adapted to chuck a cylindrical work having an axial bore at the peripheral surface of the bore of the work. The chuck device has a chuck having a guide portion adapted to be received by the axial bore of the work so as to guide and center the latter, and a plurality of radial projections. Each of the projections has such a height that the circle contacting the outer side of the projections has a diameter at least 0.02 mm greater than the inside diameter of the work.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: September 17, 1985
    Assignees: Hitachi, Ltd., Kawamura Co., Ltd.
    Inventors: Hisanobu Kanamaru, Akira Tohkairin, Takuzo Kurosawa
  • Hydraulic pressure producing system for a hydraulic press
    Patent number: 4325678
    Abstract: A hydraulic pressure producing system including clutch means located between an output shaft of a motor and a rotary pump arranged in a liquid and operated from outside. The rotary pump is driven only when the clutch means is engaged to obtain a discharge pressure.
    Type: Grant
    Filed: December 12, 1979
    Date of Patent: April 20, 1982
    Assignees: Hitachi, Ltd., Kawamura Co., Ltd.
    Inventors: Hisanobu Kanamaru, Moisei Okabe, Akira Tohkairin, Hideo Tatsumi, Takuzo Kurosawa