Patents by Inventor Wilhelm Schaefer

Wilhelm Schaefer 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).

  • Thrust bearing system for counter-rotating propeller shafts, particularly ships propeller shafts
    Patent number: 4993848
    Abstract: Two propeller shafts are disposed coaxially one within another. A collar of the inner propeller shaft grips into the hollow outer propeller and supports the inner shaft axially over axial friction bearing elements. The axial friction bearing elements are surrounded by a shaft connecting piece, which is divided in the axial direction and at least one half of which can be removed radially, in order to create access to the axial friction bearing elements. By way of the axial friction bearing elements, axial forces of the inner propeller shaft reach the hollow outer propeller shaft and, from the latter, by way of further axial friction bearing elements, further reach a bearing housing, which is preferably also divided in the longitudinal direction.
    Type: Grant
    Filed: January 25, 1990
    Date of Patent: February 19, 1991
    Assignee: Renk Tack GmbH
    Inventors: Erich John, Wilhelm Schaefer