Patents Represented by Law Firm Christensen O'Connor PLLC Johnson & Kindness
  • Patent number: 5921338
    Abstract: A multiple wheel drive personal transporter includes a lightweight skeletal frame based on a single cylindrical fore-aft beam to which front and rear axle, motor drive and wheel assemblies are connected. Each wheel is driven by a battery powered electrical motor and transmission gear sprocket chain drive. All wheels, or by user control option just front wheels, are powered on in parallel and energized by PWM drive circuitry. Throttle, forward/reverse, steering and other controls are available on a single flight stick. The seat is mounted over the beam near the rear, with front and rear battery trays and the user's weight distributed for optimum stability and traction and the beam is made of telescoped tubular sections incorporating a seat tilt limiting differential that responds to differential rotation of the front and rear wheel assemblies as the transporter traverses uneven ground.
    Type: Grant
    Filed: August 11, 1997
    Date of Patent: July 13, 1999
    Assignees: Robin L. Edmondson, Roger Edmondson
    Inventor: Jonathan L. Edmondson