Patents by Inventor Fumio Numakura

Fumio Numakura 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).

  • Tensioner for a chain, a belt or the like
    Patent number: 4959041
    Abstract: A tensioner is provided with a female screw member for the tension adjustment of a belt or a chain screwed with a male screw provided a rotation force by a spring and a bearing in which the female screw member is inserted and constrains the rotation of the female screw member.In this tensioner, an outer form of the female screw member is formed so as to correspond to a bearing hole of the bearing. By this, an approximately whole length of the female screw member is able to slide through the bearing hole, and the stroke length of the female member can be secured sufficiently even if the size of the device in a tension controlling direction is shortened.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: September 25, 1990
    Assignee: NHK Spring Co., Ltd.
    Inventors: Juji Ojima, Kazuo Ishii, Fumio Numakura
  • Tensioner for a chain, a belt or the like
    Patent number: 4902266
    Abstract: A tensioner is provided with a female screw member for the tension adjustment of a belt or a chain screwed with a male screw provided a rotation force by a spring and a bearing in which the female screw member is inserted and constrains the rotation of the female screw member.In this tensioner, an outer form of the female screw member is formed so as to correspond to a bearing hole of the bearing. By this, an approximately whole length of the female screw member is able to slide through the bearing hole, and the stroke length of the female member can be secured sufficiently even if the size of the device in a tension controlling direction is shortened.
    Type: Grant
    Filed: November 9, 1988
    Date of Patent: February 20, 1990
    Assignee: NHK Spring Co., Ltd.
    Inventors: Juji Ojima, Kazuo Ishii, Fumio Numakura