A wheel with a suspension system being connectable to a vehicle, like a wheel chair. The wheel includes a hub and a rim rotatable about the axle of the hub. Between the hub and the rim, a number of support members is located. The support members are adapted to retain the distance when stressed up to a threshold value and recoverly alter the distanced when stressed over this threshold value. Exemplary support members are spring elements, damping strokes by compression if the support member is compressed or elongated. The spring elements may be preloaded.

The invention relates to a seating assembly (100) comprising a basic frame (101), a seat unit (102), and a back-support unit (103) wherein the seat unit and the back-support unit have a common pivoting axis (P) with respect to the frame at the level of the hip joint. Hence, based on human body like biomechanics and physiognomy, the seating assembly, particularly for ergonomic chairs or wheelchairs, provides a highly improved seating comfort, even with therapeutic effect.

A medical rehabilitation chair includes a main frame, multiple castor devices mounted on the bottom of the main frame, and two armrest boards mounted on two sides of the main frame. A telescopic damping driver, a seat frame assembly, a backrest frame assembly, a leg support assembly, a lifting mechanism, and a foot support assembly are assembled on the main frame. The seat frame assembly has a front section connecting the leg support assembly and a rear section connecting the backrest frame assembly. The telescopic damping driver drives the backrest frame assembly, the seat frame assembly, and the leg support assembly, to produce different swinging angles. The lifting mechanism drives the seat frame assembly to lift or lower. The foot support assembly is movable in a horizontal direction to protrude from the front section of the main frame.