WHEELCHAIR COMPRISING A CENTRAL WHEEL DRIVE UNIT, PARTICULARLY ELEVATED WHEELCHAIR

摘要

The wheelchair with middle wheel drive has a wheel frame ( 11 ) comprising a front portion ( 13 ) and a back portion ( 15 ) pivotally connected together by a hinge ( 17 ). At least one front wheel ( 23 ), two middle wheels ( 21 ) and at least one auxiliary wheel ( 25 ) are provided. It is important that the auxiliary wheel ( 25 ) is located between the front wheel ( 23 ) and the middle wheels ( 21 ) and at a distance from the running plane ( 27 ) of these wheels. On surmounting an obstacle ( 43 ) the gas spring ( 17 ) is biassed both by the front wheels ( 23 ) and the auxiliary wheel ( 25 ) and is released again on the further travel of the wheelchair. This facilitates surmounting of obstacles.