Patents by Inventor Shoji Tabei

Shoji Tabei 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).

  • Patent number: 5575171
    Abstract: A process is provided for the production of a webbing take-up spindle by cold-forming of a cylindrical blank. The cylindrical blank is cold-formed into a preform having a flange-shaped disc portion and a spindle portion extending from and in continuation with said disc portion. Wedge action dies, whose pressing portions are in the form of ratchet teeth, are pressed against an upper and lower sides of an outer peripheral portion of the disc portion, respectively, so that ratchet teeth are partially formed and a thin-walled portion is also formed circumferentially along said partially-formed ratchet teeth. The thin-walled portion is then punched to fully form the ratchet teeth. A forming apparatus suitable for use in the practice of the process is also disclosed.
    Type: Grant
    Filed: October 18, 1994
    Date of Patent: November 19, 1996
    Assignee: NSK Ltd.
    Inventors: Hiroyuki Sawai, Yasuhisa Fujiwara, Shoji Tabei