Patents by Inventor Edward S. Freiwald

Edward S. Freiwald 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: 4359208
    Abstract: An emergency brake control system for hoists including means for generating a first electrical signal indicating the direction of travel of a conveyance, means for generating a second signal indicating the presence or absence of an emergency situation and control means responsive to the first and second signals for immediately applying the emergency brake when the conveyance is descending and an emergency exists and delaying application of the emergency brake only after the conveyance has come to a complete stop when the conveyance is ascending and an emergency exists. Overriding safety features may also be employed to provide immediate application of the emergency brake regardless of the direction of travel of the conveyance of certain emergencies, such as over travel of the conveyance, exist.
    Type: Grant
    Filed: May 30, 1980
    Date of Patent: November 16, 1982
    Assignee: Rexnord Inc.
    Inventors: Alvin Kelm, Edward S. Freiwald
  • Patent number: D310009
    Type: Grant
    Filed: November 17, 1987
    Date of Patent: August 21, 1990
    Assignee: Greenlee Textron Inc.
    Inventor: Edward S. Freiwald
  • Patent number: D318006
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: July 9, 1991
    Assignee: Greenlee Textron Inc.
    Inventors: Vernon Wanner, Edward S. Freiwald, Orville W. Larsen