Patents by Inventor Yoshihiro Yonahara

Yoshihiro Yonahara 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).

  • Elevatable work facility
    Patent number: 5588500
    Abstract: A scaffolding floor is provided on the upper ends of four expandable and contractible struts. A support frame protrudes downward from the scaffolding floor. An end of a line is connected to the lower end of the support frame and the other end of the line is connected to the fixed part of a hydraulic jack which is provided in the lower part of the struts, so that the scaffolding floor can be elevated or lowered through the line in accordance with the raising or lowering of the hydraulic jack.
    Type: Grant
    Filed: November 22, 1994
    Date of Patent: December 31, 1996
    Assignee: Japan Steels International Inc.
    Inventor: Yoshihiro Yonahara
  • Frame parts for temporary ladder
    Patent number: 5492197
    Abstract: A temporary scaffold comprising a platform section and an auxiliary section, each comprising a E-shaped frame formed of an arrangement of pipes. The pipes are telescopically connected in end-to-end relationship. As a result, the platform and auxiliary sections are interconnected so that their connected length is adjustable.
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: February 20, 1996
    Inventor: Yoshihiro Yonahara
  • Folding scaffold for a construction work
    Patent number: 5474151
    Abstract: In a scaffold for construction work, four supports are provided at the respective corners of a rectangle. The front and rear supports on each side are connected to each other by connecting frames which can be folded without changing the height of the scaffold. After the connecting frames are folded, a scaffolding floor member provided on the top surface enclosed by the four supports can be rotated about its one end so as to pivot to a lowered vertical position.
    Type: Grant
    Filed: February 16, 1994
    Date of Patent: December 12, 1995
    Assignee: Japan Steels International Inc.
    Inventor: Yoshihiro Yonahara
  • Foothold device
    Patent number: 4388982
    Abstract: A scaffold having a number of platform plates connected through independent chains. Independent chains are also provided above the uppermost platform and below the lowermost platform for connection to upper fitting members and lower fitting members, respectively integral with a wall. The latter chains are provided with tensioning means enabling the scaffold to be firmly and rigidly secured to the wall. The platforms are also adjustable horizontally.
    Type: Grant
    Filed: July 9, 1980
    Date of Patent: June 21, 1983
    Inventor: Yoshihiro Yonahara