Patents by Inventor Chi-Hua Hsu

Chi-Hua Hsu 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).

  • Self-aligning decoupled nut mechanism
    Publication number: 20020020234
    Abstract: A feed screw and nut mechanism includes a nut having an internally threaded bore which threadingly engages an externally threaded feed screw. A runner bearing is attached to the nut and projects outwardly therefrom, and a dummy runner bearing is attached to the nut and projects outwardly therefrom and is angularly displaced from the runner bearing about the feed screw axis. The mechanism includes a stationary runner defining a runner surface that is engaged by the runner bearing to prevent rotation of the nut, and a dummy runner defining a dummy runner surface that engages the dummy runner bearing. The dummy runner and dummy runner bearing are biased toward each other such that the nut is rotatably biased in a direction to urge the runner bearing against the runner surface.
    Type: Application
    Filed: May 30, 2001
    Publication date: February 21, 2002
    Applicant: University of North Carolina
    Inventors: Stuart Smith, Gurpreet Singh, Chi-Hua Hsu
  • Self-aligning decoupled nut mechanism
    Patent number: 6244122
    Abstract: A feed screw and nut mechanism includes a nut having an internally threaded bore which threadingly engages an externally threaded feed screw. A runner bearing is attached to the nut and projects outwardly therefrom, and a dummy runner bearing is attached to the nut and projects outwardly therefrom and is angularly displaced from the runner bearing about the feed screw axis. The mechanism includes a stationary runner defining a runner surface that is engaged by the runner bearing to prevent rotation of the nut, and a dummy runner defining a dummy runner surface that engages the dummy runner bearing. The dummy runner and dummy runner bearing are biased toward each other such that the nut is rotatably biased in a direction to urge the runner bearing against the runner surface.
    Type: Grant
    Filed: October 1, 1998
    Date of Patent: June 12, 2001
    Assignee: University of North Carolina at Charlotte
    Inventors: Chi-Hua Hsu, Stuart Smith, Gurpreet Singh