Patents Assigned to 744353 Alberta Ltd.
  • Helical drive wheelchair
    Patent number: 6213487
    Abstract: A wheelchair is provided with a helical drive mechanism. A rectilinear input to the helical drive causes an output gear to rotate, thus providing power to rotate the driving wheels of a wheelchair. The helical drive may include, for example, a compound helix, a drive with a twisted flat bar, or a concentric helix drive. Add-on components may be provided to convert a conventional wheelchair to a wheelchair powered by a helical drive mechanism.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: April 10, 2001
    Assignee: 744353 Alberta Ltd.
    Inventor: Mighel Doroftei