Patents by Inventor Erik Hellstrom

Erik Hellstrom 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: 4023605
    Abstract: Method and apparatus for trimming and grading lumber during transport thereof along a conveyor through a trimming device in which the lumber is cut at both root and top ends; said method comprising, arranging the lumber transverse a conveyor, initially cutting at the root end, directing the remanent transversely of the conveyor to a stop positioned to intercept the top end thereof and located less than one multiple of a length module unit, directing the remanent in the return transverse direction to one of a plurality of finger members, each located one length module from the other in a row transverse the conveyor, making the first top end cut, turning the remanent about its axis for inspection of all sides thereof and directing the remanent to a second cutter for a final top end cut determined by the number of length module units desired, the selection of length being controlled by adjustable stop means.
    Type: Grant
    Filed: April 25, 1975
    Date of Patent: May 17, 1977
    Assignee: A B Hammars Mekanisha Verkstad
    Inventors: Nils Erik Hellstrom, Bengt Artur Berg