Patents by Inventor Alf H. Svanstrom

Alf H. Svanstrom 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).

  • Plain and thrust bearing device
    Patent number: 4109974
    Abstract: A device for reducing friction between surface planes sliding against each other in axial thrust bearings between the shaft end and roller in rotary roller bits and rollers for rock and earth boring, especially at full size tunnel driving. A friction reducing groove is arranged eccentrically in relation to the axes of the shaft end and the roller in at least one of the surface planes sliding against each other. Said groove is filled with material having a friction reducing and/or lubricating effect.
    Type: Grant
    Filed: January 25, 1977
    Date of Patent: August 29, 1978
    Assignee: Fagersta Secoroc AB
    Inventors: Alf H. Svanstrom, Karl-Erik Kangas