Patents by Inventor Roger J. Lofstrom

Roger J. Lofstrom 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: 5895198
    Abstract: A coil unloading rig is adapted to handle, tilt and position a coil of sheet metal. An arcuate rail has opposed upper and lower open ends and an intermediate arcuate section. A trolley rotatably suspends the rail from a ceiling crane. A ring is disposed in a plane normal to the plane of the rail. A top brace is fixed to the upper rail end and the ring and a lower brace is fixed to the lower rail end and the ring. A pair of divergent posts are on each side of the lower brace, each post having post brackets for supporting and clamping the coil in a vertical position. A vertically movable brace bracket is movably mounted on the top brace for supporting and clamping the coil supported by the post brackets whereby the coil unloading rig is adapted to support and clamp a coil in a vertical position and tilt the coil by rotating the rail by the trolley to a horizontal position.
    Type: Grant
    Filed: August 13, 1998
    Date of Patent: April 20, 1999
    Inventor: Roger J. Lofstrom
  • Patent number: 5292084
    Abstract: A core slip apparatus for winding strips into coils includes a roller sleeve mounted on an arbor. Cores mounted on the sleeve are used to form the coils as the arbor rotates. The roller sleeve prevents friction between the core and the arbor thereby insuring that the winding proceeds properly and is not affected by the weight of the coil.
    Type: Grant
    Filed: January 8, 1992
    Date of Patent: March 8, 1994
    Inventor: Roger J. Lofstrom
  • Patent number: 5170684
    Abstract: A device for separating a cardboard tube into cores for winding strips of material includes a mandrel mounted for rotation on a frame. A carriage reciprocates in parallel with a mandrel and may be positioned very precisely to cut cores of preselected axial width from the tube mounted on the mandrel. A blade pivots on the carriage for performing the actual cutting operation.
    Type: Grant
    Filed: March 4, 1992
    Date of Patent: December 15, 1992
    Inventor: Roger J. Lofstrom
  • Patent number: 4219168
    Abstract: A slitting and rewinding system having a tension stand assembly with at least one pressure pad is provided. The system includes a payoff, a slitter, a tension stand, and a coil rewinder. A roll of material, usually metal, is positioned on the payoff so that it is aligned with the slitter. The slitter is fed the material from the payoff and transforms the relatively wide stock into narrow strips. The strips are untensioned between the slitter and tension stand, and may form a loop. Tension is provided between the tension stand and the rewinder due to both the winding action of the rewinder and a pressure pad provided within the tension stand. The pad exerts uniform pressure on the strips as they pass through the stand, thereby helping to form the loop on one side and provide tensioned strips on the other. The system allows a wide metal coil to be processed without difficulty even if there are variations in thickness in the coil.
    Type: Grant
    Filed: March 26, 1979
    Date of Patent: August 26, 1980
    Assignee: H. J. Ruesch Machine Co.
    Inventor: Roger J. Lofstrom