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2. Killough platform - Wikipedia

   en.wikipedia.org/wiki/Killough_platform

   Designed by Stephen Killough, after which the platform is named, with help from Francois Pin, wanted to achieve omni-directional movement without using the complicated six motor arrangement required to achieve a controllable three caster wheel system (one motor to control wheel rotation and one motor to control pivoting of the wheel). He first ...

3. Caster - Wikipedia

   en.wikipedia.org/wiki/Caster

   A caster (or castor) is an undriven wheel that is designed to be attached to the bottom of a larger object (the "vehicle") to enable that object to be moved. Casters are used in numerous applications, including shopping carts , office chairs , toy wagons , hospital beds, and material handling equipment.

4. Motorized wheelchair - Wikipedia

   en.wikipedia.org/wiki/Motorized_wheelchair

   A motorized wheelchair, powerchair, electric wheelchair, or electric-powered wheelchair (EPW) is a wheelchair that is propelled by means of an electric motor (usually using differential steering) rather than manual power. Motorized wheelchairs are useful for those unable to propel a manual wheelchair or who may need to use a wheelchair for ...

5. Wheelchair - Wikipedia

   en.wikipedia.org/wiki/Wheelchair

   Smaller power chairs often have four wheels, with front or rear wheel drive, but large outdoor designs commonly have six wheels, with small wheels at front and rear and somewhat larger powered wheels in the centre. A power-assisted wheelchair is a recent development that uses the frame and seating of a typical rigid manual chair while replacing ...

6. Caster angle - Wikipedia

   en.wikipedia.org/wiki/Caster_angle

   Caster displacement moves the steering axis ahead of the axis of wheel rotation, as with the front wheels of a shopping cart. Caster angle moves the steering axis from vertical. [3] In automobile racing, the caster angle may be adjusted to optimize handling characteristics for a particular venue. This is all connected to the front wheels.

7. Centreless wheel - Wikipedia

   en.wikipedia.org/wiki/Centreless_wheel

   The Skatecycle is a device similar to a caster board, but with hubless wheels and a 2-axis twisting axle replacing the function of the casters. The central axle connects two standing platforms surrounded by 9" polyurethane hubless wheels, giving said wheels the appearance of stirrups. In order to move the unit, the rider rotates their feet ...