Patents by Inventor Darrell G. Kohler

Darrell G. Kohler 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).

  • Valve pin operating mechanism
    Patent number: 7210922
    Abstract: A hot runner injection molding apparatus includes a manifold for transferring molten plastic into a channel to a mold gate. A valve pin extends at least partially through the channel and is reciprocally movable from a retracted position to an extended position to close the mold gate when the valve pin is in the extended position, and to open the mold gate when the valve pin is in the retracted position. A valve pin moving mechanism is coupled with the valve pin to directly move the valve pin to the extended position; and a resilient coupling is located between the valve pin and the valve pin moving mechanism for normally moving the valve pin to the retracted position.
    Type: Grant
    Filed: November 18, 2004
    Date of Patent: May 1, 2007
    Assignee: Tech Mold, Inc.
    Inventor: Darrell G. Kohler