Patents by Inventor Bo Hagstedt

Bo Hagstedt 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: 5244285
    Abstract: Squeeze film damper with a viscous damping agent between two concentric cylindrical surfaces (5) on the internal (3) and external (6) parts, respectively, of the damper. The clearance between these two surfaces (5) is supplied with a viscous damping agent, usually oil, from a groove (4) in the cylindrical surface on the internal part (3) of the damper. This groove (4) does not extend all around. In the lower part of the internal part (3) of the damper there are instead two pockets (7) which are separated from each other and from the long damper oil groove (4). When these two pockets (7) are supplied through channels (8) with oil of an adjusted pressure, a lifting force arises which acts on the internal part (3) of the damper so that this part and the associated shaft (1) are lifted and centered, whereupon during operation a damper clearance, extending all around, is obtained without mechanical means. (FIG.
    Type: Grant
    Filed: August 17, 1992
    Date of Patent: September 14, 1993
    Assignee: ABB Stal AB
    Inventors: Bo Hagstedt, Hans-Lennart Olausson