Patents by Inventor Randall T. Kerkstra

Randall T. Kerkstra 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).

  • Mold interlocks
    Patent number: 9770858
    Abstract: A mold bushing assembly includes a pin member for assembly to a first mold portion and a bushing member for assembly to a second mold portion. The pin member includes a projection that includes a land portion and a guide portion, with the land portion being cylindrical and having an axial length, and with the guide portion extending from the land portion and having a varying cross sectional diameter that decreases from the land portion. The bushing member includes a bushing cavity into which the projection at least partially extends when the first and second mold portions are engaged with at least a portion of the land portion extending into the bushing cavity to aid in accurate alignment of the mold portions.
    Type: Grant
    Filed: November 7, 2016
    Date of Patent: September 26, 2017
    Assignee: Stampede Die Corp.
    Inventors: Lee A. VanDyk, Randall T. Kerkstra
  • Mold interlocks
    Patent number: 9486942
    Abstract: A mold bushing assembly includes a pin member for assembly to a first mold portion and a bushing member for assembly to a second mold portion. The pin member includes a projection that includes a land portion and a guide portion, with the land portion being cylindrical and having an axial length, and with the guide portion extending from the land portion and having a varying cross sectional diameter that decreases from the land portion. The bushing member includes a bushing cavity into which the projection at least partially extends when the first and second mold portions are engaged with at least a portion of the land portion extending into the bushing cavity to aid in accurate alignment of the mold portions.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: November 8, 2016
    Assignee: Stampede Die Corp.
    Inventors: Lee A. VanDyk, Randall T. Kerkstra