Patents by Inventor Sinki Ohtsu

Sinki Ohtsu 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).

  • Percussion tool
    Patent number: 6155356
    Abstract: A hammer holder, provided between a retainer sleeve and a cylinder, slidably holds an intermediate member in an axial direction. A predetermined clearance is maintained between the hammer holder and the retainer sleeve. The hammer holder has a recessed portion which is engageable with a flange of the intermediate member so as to restrict the slide movement of the intermediate member. A cushioning member receives a percussion force when the flange is stopped by the recessed portion. The clearance restricts a compression amount of the cushioning member so that a predetermined life of the cushioning member is assured.
    Type: Grant
    Filed: October 25, 1999
    Date of Patent: December 5, 2000
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Atsuyuki Kikuchi, Sinki Ohtsu, Mutsuo Harada, Akihisa Yahagi