Patents by Inventor Thomas A. Esch

Thomas A. Esch 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).

  • Variable eccentricity mass for mechanical shakers
    Patent number: 4776156
    Abstract: Means to control imbalance of an eccentric mass connected to a rotating shaft in a shaker housing wherein the eccentric mass is adjacent to but is not fixedly connected to the shaft, wherein a first end of the mass is connected to a mass moving means which can move one end of the mass to a plurality of different distances from the rotating shaft, and is able to hold that end of the mass at each of these distances during rotation; wherein a second end of the mass is restrained from centrifugal movement during rotation of the shaft.
    Type: Grant
    Filed: May 13, 1987
    Date of Patent: October 11, 1988
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Galen K. Brown, Henry A. Affeldt, Jr., Thomas A. Esch, Richard J. Wolthuis