Patents Assigned to Ritshyo Kogyo Kabushiki Kaisha
  • Wrist exercise and strengthening device
    Patent number: 4039183
    Abstract: A device is provided for exercising and strengthening the human wrist, which comprises a concave trough with two parallel spaced members projecting from one end thereof and a grip rotatably mounted on the elongated member. Springs provide a force which rotates the grip away from the longitudinal axis of the concave trough. The device fits on the human forearm directly above the wrist and provides wrist strengthening exercises for the user by means of the grip being biased by the force of the springs against the flexing of the wrist.
    Type: Grant
    Filed: April 21, 1976
    Date of Patent: August 2, 1977
    Assignee: Ritshyo Kogyo Kabushiki Kaisha
    Inventor: Hiroshi Sakurada