Patents by Inventor Masaaki Bandou

Masaaki Bandou 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).

  • Valve sleeve and method of manufacturing same
    Patent number: 4762302
    Abstract: A method of manufacturing a valve sleeve is disclosed which is adapted to construct an oil rotary valve together with a valve rotor, and a valve sleeve of a configuration which is suitably formed by carrying out the method is also disclosed. The valve sleeve has an axially extending groove in its inner surface, and the bottom surface of the groove has a portion which is disposed at an angle with respect to the axis. The method of manufacturing comprises shaping a cylindrical member having an inner and an outer diameter, both of which are greater than those of a valve sleeve to be manufactured, inserting a punch into the material, and applying a compression to the material from the radially outside thereof to cause the internal surface of the material to bear against the punch.
    Type: Grant
    Filed: July 28, 1987
    Date of Patent: August 9, 1988
    Assignees: Jidosha Kiki Co., Ltd., Gunma Seikou Co., Ltd.
    Inventors: Masaaki Bandou, Masao Sugita, Takachi Marumo
  • Method of manufacturing a valve sleeve
    Patent number: 4706487
    Abstract: A method of manufacturing a valve sleeve is disclosed which is adapted to construct an oil rotary valve together with a valve rotor, and a valve sleeve of a configuration which is suitably formed by carrying out the method is also disclosed. The valve sleeve has an axially extending groove in its inner surface, and the bottom surface of the groove has a portion which is disposed at an angle with respect to the axis. The method of manufacturing comprises shaping a cylindrical member having an inner and an outer diameter, both of which are greater than those of a valve sleeve to be manufactured, inserting a punch into the material, and applying a compression to the material from the radially outside thereof to cause the internal surface of the material to bear against the punch.
    Type: Grant
    Filed: June 2, 1986
    Date of Patent: November 17, 1987
    Assignee: Jidosha Kiki Co., Ltd.
    Inventors: Masaaki Bandou, Masao Sugita, Takachi Marumo