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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 ...
Class 2 comprises mechanically propelled vehicles such as motorized wheelchairs and mobility scooters, limited to 4 mph (6.4 km/h). Class 3 consists mostly of mobility scooters. They are limited to 8 mph (13 km/h), with a further limiter set to 4 mph (6.4 km/h) which must be enabled when used on a pavement.
Stephan Farffler (1633 – October 24, 1689 [1]), sometimes spelled Stephan Farfler, was a German watchmaker of the seventeenth century whose invention of a manumotive carriage in 1655 is widely considered to have been the first self-propelled wheelchair.
An attendant-propelled wheelchair (also known as a companion or transfer chair) is generally similar to a self-propelled manual wheelchair, but with small diameter wheels at both front and rear. The chair is maneuvered and controlled by a person standing at the rear and pushing on handles incorporated into the frame.
The rails are, necessarily, of heavy construction to support the load and the drive system is usually accommodated within a tubular section rail or aluminum extrusion. Some models have steel cables inside the tube, others have chains; yet others may use a rack and pinion system. Many wheelchair platform stairlifts are designed and built to order.
The first modular self-propelled trailers were built in the 1970s. In the early 1980s, heavy haulage company Mammoet [6] refined the concept into the form seen today. [7] They set the width of the modules at 2.44 m, so the modules would fit on an ISO container flatrack. They also added 360° steering. [8]