Patents by Inventor Kazuo Nakajima

Kazuo Nakajima 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).

  • Internally accommodated speed change mechanism applicable to a bicycle, etc.
    Patent number: 4052914
    Abstract: The present invention relates to an internally accommodated three-stage speed change mechanism and an internally accommodated five-stage speed mechanism applicable to a bicycle, in which inside a hub body incorporating a portion of a speed change mechanism a first planetary gear mechanism is accommodated and a first speed changing rod is provided for controlling the first planetary gear mechanism, the ring gear of which is slidably moved by first the speed changing rod and the planetary gear of which remains axially fixed regardless of the first speed change rod.Further, a second planetary gear mechanism is assembled additionally to the aforesaid planetary gear mechanism and a second speed changing rod controlling the revolution and torque transmitting process of a sun gear of the second planetary gear mechanism is provided.
    Type: Grant
    Filed: April 10, 1975
    Date of Patent: October 11, 1977
    Assignee: Xenoah Co.
    Inventor: Kazuo Nakajima