Patents by Inventor Fred E. Langford

Fred E. Langford 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).

  • Method & apparatus for providing low speed safety braking for a hoist system
    Patent number: 5671912
    Abstract: At predetermined low speeds, a safety brake is applied directly to the hoisting drum at a setting sufficiently high to stop the load from falling should drive line failure occur. The load can be lowered or raised by applying sufficient torque to the drum to overcome the braking force and thus lower or raise the load. If drive train failure occurs, the brake will instantaneously stop the load without further uncontrolled movement.
    Type: Grant
    Filed: October 24, 1995
    Date of Patent: September 30, 1997
    Assignee: Ederer Corporation
    Inventors: Fred E. Langford, Roger A. Johnson