Patents by Inventor John K. Kershaw

John K. Kershaw 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: 5183118
    Abstract: Apparatus for excavating ballast from adjacent to the ends of and beneath the cross ties of a railroad bed and for cleaning the excavated ballast for return thereof to the railroad bed. The apparatus includes a vehicle for supporting a pair of excavating assemblies on opposite sides of the vehicle. Each excavating assembly includes a pair of spaced excavating wheels for excavating ballast from adjacent to the opposite sides of the cross ties and an undercutter for excavating ballast from beneath the cross ties at opposite ends thereof. A discrete cleaning station is provided for each excavating wheel to receive and clean the ballast picked up by each excavating wheel. Means are provided for conveying and discharging the cleaned ballast back onto the railroad bed.
    Type: Grant
    Filed: October 31, 1991
    Date of Patent: February 2, 1993
    Assignee: Knox Kershaw, Inc.
    Inventors: John K. Kershaw, Philip C. McCray
  • Patent number: 5109775
    Abstract: Apparatus for excavating ballast from a railroad bed adjacent to the cross ties of a railroad track and for cleaning the excavated ballast for return thereof to the railroad bed. The apparatus includes a vehicle for supporting a pair of excavating assemblies on opposite sides of the support vehicle and thus on opposite sides of the railroad track and a discrete cleaning station for each of the separate excavating assemblies. Each cleaning station is disposed for receiving and cleaning the ballast excavated by the associated excavating assembly.
    Type: Grant
    Filed: September 28, 1990
    Date of Patent: May 5, 1992
    Assignee: Knox Kershaw, Inc.
    Inventors: John K. Kershaw, Philip C. McCray
  • Patent number: 5029649
    Abstract: Apparatus for excavating ballast from a railroad bed and for cleaning the excavated ballast for return thereof to the railroad bed. The apparatus includes a vehicle for supporting a pair of excavating assemblies on opposite sides of the support vehicle and thus on opposite sides of the railroad track and a discrete cleaning station for each of the separate excavating assemblies. Each cleaning station is disposed for receiving and cleaning the ballast excavated by the associated excavating assembly. Each excavating assembly includes, in spaced, serial relation, a forward excavating wheel, an undercutter, and a second or rear excavating wheel.
    Type: Grant
    Filed: November 19, 1990
    Date of Patent: July 9, 1991
    Assignee: Knox Kershaw, Inc.
    Inventors: John K. Kershaw, Philip C. McCray