Patents by Inventor Kelly H. Schaefer

Kelly H. Schaefer 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).

  • Roller guide assembly featuring a combination of a solenoid and an electromagnet for providing counterbalanced centering control
    Patent number: 5810120
    Abstract: The present invention provides a roller guide assembly for controlling the position of an elevator car in relation to guide rails of an elevator hoistway in an elevator system. The roller guide assembly includes at least one electromagnet means and at least one solenoid means. The at least one electromagnet means responds to an elevator car control signal from an elevator car controller, for providing at least one electromagnet force to adjust the position of the elevator car in relation to the guide rails of the elevator hoistway. The at least one solenoid means responds to the elevator car control signal, for providing at least one solenoid force that counterbalances said at least one electromagnet force for adjusting the position of the elevator car in relation to the guide rails of the elevator hoistway.
    Type: Grant
    Filed: November 5, 1996
    Date of Patent: September 22, 1998
    Assignee: Otis Elevator Company
    Inventors: Eric K. Jamieson, Dang V. Nguyen, Kelly H. Schaefer