Patents by Inventor Keiichirou Yamazaki

Keiichirou Yamazaki 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).

  • Fixing mechanism for stair units facilitating adjustment of height
    Patent number: 4557085
    Abstract: A fixing mechanism of stair units which are used for assembling a curved stair. Each stair unit has an upwardly projecting cylindrical member and a downwardly projecting cylindrical member at opposite ends. The upwardly projecting cylindrical member of the lower stair unit is inserted into the downwardly projecting member of the upper stair unit rotatably and slidably in the vertical direction. These two cylindrical members are fixed to each other by a screw member disposed on the axis of the upwardly projecting cylindrical member and a pair of nut members, which are engaged with the screw member with clamping an anchor member fixed to the downwardly projecting cylindrical member.
    Type: Grant
    Filed: September 12, 1983
    Date of Patent: December 10, 1985
    Inventor: Keiichirou Yamazaki