Patents by Inventor Kunizo Hiraoka

Kunizo Hiraoka 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).

  • Emergency escape apparatus
    Patent number: 4722422
    Abstract: An emergency escape apparatus allows safe escape from a tall building on fire. It includes a case carried by a user on his back. A wire wound around a reel mounted in the case has one end secured to the case. With the other end of the wire secured to the building, the user jumps down. The wire is drawn out of the case, and a brake device in the case applies a braking force to the wire, allowing the user land softly.
    Type: Grant
    Filed: March 3, 1986
    Date of Patent: February 2, 1988
    Inventor: Kunizo Hiraoka
  • Apparatus for producing concrete pipes
    Patent number: 4451222
    Abstract: An improved apparatus for producing concrete pipes includes a molding box and a pair of runner wheels for supporting the molding box. The box is vibrated while being rotated to disperse the components of ballast uniformly with sand and cement interposed therebetween. This apparatus makes it possible to produce concrete pipes having a higher strength.
    Type: Grant
    Filed: June 23, 1982
    Date of Patent: May 29, 1984
    Inventor: Kunizo Hiraoka
  • Apparatus for molding a concrete pipe
    Patent number: 4360331
    Abstract: An apparatus for molding a concrete pipe in which a belt conveyor runs parallel to the axis of a molding flask and is adapted to longitudinally move in the molding flask within the range between both ends of the molding flask. The belt conveyor is subjected to intermittent longitudinal movement at a fixed traveling distance in response to a prescribed degree of compactedness of concrete attained in each position where the belt conveyor stops.
    Type: Grant
    Filed: May 8, 1981
    Date of Patent: November 23, 1982
    Assignee: Hiraoka Giken Kogyo Co., Ltd.
    Inventor: Kunizo Hiraoka
  • Process for molding a concrete pipe
    Patent number: 4311632
    Abstract: A process of molding a concrete pipe is proposed. The attainment of a predetermined degree of compactedness of fresh concrete is electrically detected through a pressing roller by which the fresh concrete is compacted in a molding flask. When a predetermined degree of compactedness of concrete is attained in one place within the molding flask, a belt conveyor for feeding the molding flask with fresh concrete is automatically moved to the next place.
    Type: Grant
    Filed: June 16, 1980
    Date of Patent: January 19, 1982
    Assignee: Hiraoka Giken Kogyo Co., Ltd.
    Inventor: Kunizo Hiraoka