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US 6,247,718 B1Granted
Wheelchair for handicapped
OwnerDieter Gobbers, Walters Gobbersinventors
Life of this patent
Estimating the term…
Abstract
A wheelchair has a lifting device for raising and lowering the seat or frame of the wheelchair to permit a handicapped person to reach items above or below his reach. The lifting device includes four telescopic transmission elements that are driven in unison by a motor to raise or lower the seat or frame. When in a retracted position, the lifting device fits within the frame and below the seat of the wheelchair.
Claims14
A wheelchair for the handicapped, said wheelchair comprising:
- a frame with a set of wheels;
- a seat;
- a lifting device adapted to raise and lower one of said seat and said seat and said frame, said lifting device comprising a plurality of elements that together form a column and are nested for operation like a telescopically, said plurality of elements including at least one middle element and two end elements, said at least one middle element and a first one of said two end elements having outer threads, said at least one middle element and a second one of said two end elements having an inner thread, wherein said first and second end elements have a longitudinal axis;
- and
- a drive arranged to rotate one of the first and second two end elements around said longitudinal axis in either direction to raise and lower said one of said seat and said seat and said frame.
2 more elements
Dependencies are inferred from the claim text.