Patents by Inventor Yasutaka Nakatsukasa

Yasutaka Nakatsukasa 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).

  • Method of forming as-cast holes by using cores, and apparatus for practicing the method
    Patent number: 4919189
    Abstract: A method for forming an as-cast hole by using a core involves forming an undercut and casting by using a core die which is slidable at an angle with respect to mold closing and opening directions. At the same time, an as-cast hole with an axial direction different from the slide direction of the core die is formed. To form the as-cast hole, a floating core is slidably disposed in the core die for movement in the axial direction of the as-cast hole. An apparatus for practicing the method includes a stationary die, a movable die and the core die containing the slidable floating core.
    Type: Grant
    Filed: September 21, 1988
    Date of Patent: April 24, 1990
    Assignee: Ryobi Ltd.
    Inventors: Keiji Sato, Yasutaka Nakatsukasa