Patents by Inventor William R. Chestnut

William R. Chestnut 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).

  • Power press ram safety guard with electrical interlock
    Patent number: 4572346
    Abstract: A power press is comprised of a frame, a stationary bed, a ram reciprocally movable toward and away from the bed and a safety guard for preventing movement of the ram toward the ram when the tooling for the press must be repaired or changed. The guard includes a first chain attached to the frame of the press and a second chain attached to the ram and attachable to the first chain to restrict movement of the ram toward the bed. The chains are connectable together at a plurality of locations to enable the combined, attached length of the chains to be adjusted. The adjustability permits the guard to be easily used with a press having a range of shut heights. A normally open power circuit controls the reciprocal movement of the ram. A key for closing the circuit by engagement with a receptacle in the circuit is attached to the first chain. The key is engageable with the receptacle when the chains are unattached and is not engageable with the receptacle when the chains are attached.
    Type: Grant
    Filed: January 30, 1984
    Date of Patent: February 25, 1986
    Assignee: Deere & Company
    Inventors: William R. Chestnut, Clive L. Parcell, Christopher J. Cox, David J. MacKenzie
  • All-terrain utility vehicle
    Patent number: D497324
    Type: Grant
    Filed: October 16, 2003
    Date of Patent: October 19, 2004
    Assignee: Great Plains Manufacturing Incorporated
    Inventors: William R. Chestnut, Kenneth J. King, John P. Quinley, Richard J. Robbins, Daniel Selleck, Charles A. Weaver