Patents by Inventor Esko Rantala

Esko Rantala 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).

  • Method and apparatus for measurement of web tension
    Patent number: 5052233
    Abstract: In a method and apparatus for measuring web tension, the tension of a moving web is measured by locating close to the web (14) a gauging bar (1), which has its outer surface curved in the machine direction of the web (14) and carries pressure measurement sensors (2) in holes (3) formed into the bar. An air-cushion is formed between the moving web (14) and the curved surface, wherein the pressure is proportional to the tension of the web (14). The tension of the web (14) is measured in an indirect way by gauging the air-cushion pressure. The apparatus capable of implementing the method has an apparatus (7) required for the generation of a reference pressure, and the pressure measurement apparatus is used for measuring the pressure difference between said reference pressure and the air-cushion pressure.
    Type: Grant
    Filed: July 10, 1989
    Date of Patent: October 1, 1991
    Assignee: Valmet Paper Machinery Inc.
    Inventor: Esko Rantala