Patents by Inventor Lynn O. Ringdahl

Lynn O. Ringdahl 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: 6357992
    Abstract: An apparatus for moving an object, such as a wheelchair, between an upper position and a lower position. The upper position is typically adjacent to the floor surface of a vehicle while the lower position is typically at ground level. The apparatus preferably includes a platform including at least three pivotally connected sections. The sections are selectively moveable between an unfolded orientation in which the sections are substantially co-planar and a folded orientation in which the sections form a compact configuration. The apparatus also preferably includes a folding assembly for selectively moving the sections of the platform between the folded orientation and the unfolded orientation, a deployment assembly for selectively deploying and stowing the platform and a lift assembly for selectively moving the platform vertically between the upper position and the lower position.
    Type: Grant
    Filed: January 11, 1999
    Date of Patent: March 19, 2002
    Assignee: Braun Crow River, Inc.
    Inventors: Lynn O. Ringdahl, James B. Welte
  • Patent number: 6053693
    Abstract: An apparatus for moving an object, such as a wheelchair, between an upper position and a lower position. The upper position is typically adjacent to the floor surface of a vehicle while the lower position is typically at ground level. The apparatus preferably includes a platform including at least three pivotally connected sections. The sections are selectively moveable between an unfolded orientation in which the sections are substantially co-planar and a folded orientation in which the sections form a compact configuration. The apparatus also preferably includes a folding assembly for selectively moving the sections of the platform between the folded orientation and the unfolded orientation, a deployment assembly for selectively deploying and stowing the platform and a lift assembly for selectively moving the platform vertically between the upper position and the lower position.
    Type: Grant
    Filed: August 21, 1997
    Date of Patent: April 25, 2000
    Assignee: Crow River Industries, Inc.
    Inventors: Lynn O. Ringdahl, James B. Welte
  • Patent number: 5672041
    Abstract: An apparatus for moving an object, such as a wheelchair, between an upper position and a lower position. The upper position is typically adjacent to the floor surface of a vehicle while the lower position is typically at ground level. The apparatus preferably includes a platform including at least three pivotally connected sections. The sections are selectively moveable between an unfolded orientation in which the sections are substantially co-planar and a folded orientation in which the sections form a compact configuration. The apparatus also preferably includes a folding assembly for selectively moving the sections of the platform between the folded orientation and the unfolded orientation, a deployment assembly for selectively deploying and stowing the platform and a lift assembly for selectively moving the platform vertically between the upper position and the lower position.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 30, 1997
    Assignee: Crow River Industries, Inc.
    Inventors: Lynn O. Ringdahl, Jeffrey J. Stoen, James B. Welte, Gary G. Gruber, Timothy W. Jenum
  • Patent number: 5401135
    Abstract: A wheelchair lifting platform device for raising or lowering of a wheelchair into or out of a vehicle. The invention includes a barrier safety mechanism which is connected to a wheelchair platform. The barrier safety mechanism includes a barrier plate and an activator flipper plate. The barrier plate extends vertically from, and is positioned substantially perpendicular to, a foldable platform during the raising or lowering of a wheelchair. The barrier plate functions as a safety stop prohibiting the inadvertent rolling of a wheelchair off of the platform. The activator flipper plate is pivotally connected to the platform and to the barrier plate. The activator flipper plate functions to engage a road surface as the platform is lowered, for retraction of the barrier plate as the activator flipper plate engages the ground. The invention additionally includes a latching mechanism for coupling a foldable wheelchair platform to the frame of a wheelchair lift device.
    Type: Grant
    Filed: January 14, 1994
    Date of Patent: March 28, 1995
    Assignee: Crow River Industries
    Inventors: Jeffrey J. Stoen, Lynn O. Ringdahl