1.Silla of righting for invalids or infirm wheels with a frame with wheels and a seat having a seating surface, which can be rotated around a rotating axis of the seat, with a backrest and a mechanism for straightening and lowering the seat, characterized in that the mechanism for straightening and lower the seat has an actuator, whereby drivable shaft which has on either side of the wheeled frame a crank drive, which is connected to the seat , to swirl the around the axis of rotation of the seat. 2.Silla of righting for invalids or infirm wheel according to claim 1, wherein at least a spring is provided which acts on the seat so that occurs in any seating position a moment of rotation which is approximately proportional and opposite torque resulting from the weight of the user on the seat. 3.Silla of righting or infirm invalid carriages, according to claim 2, characterized in that there is provided at least one spring on each side of the wheeled frame. 4.Silla of righting for invalids or infirm wheel according to claim 3, wherein each side of the wheeled frame are provided two spring force nearly equal. 5.Silla of righting invalid carriages or ill, according to one of claims 1 to 4, characterized in that the wheeled frame comprises two substantially parallel side racks, which are held during use of the wheel chair righting by struts or folding radii spaced if not used or transported righting chair wheels can be released to fold the chair. 6.Silla of righting for invalids or patients, according to one of claims 1 to 3, characterized in that the drive shaft is an articulated shaft which acts simultaneously as foldable strut wheels. 7.Silla of righting invalid carriages or ill, according to claim 6, characterized in that the articulation axis and at least one reinforcing strut or folding are joined together by joining devices, to enable the common folding strut and the hinge axis. 8.Silla of righting for invalids or infirm wheel according to claim 1, wherein the connecting means consist of a connecting rod which is connected to a scissors with two side racks, to ensure a regular folding. 9.Silla of righting for invalids or infirm wheel according to one of claims 1 to 8, characterized in that pivot points between the seat and footrests and / or support are arranged such that the straightening or lower the seat not be practically no relative movement between the body of the person and the seat and / or backrest. 10.Silla of righting invalid carriages or ill, according to claim 9, wherein the seat is mounted on the wheeled frame some distance from the front edge of the seat and the seat surface below it. 11.Silla of righting for invalids or infirm wheel according to claim 9 or 10, characterized in that the backrest is supported on the seat some distance above the seat surface. 12.Silla of righting invalid carriages or ill, according to one of claims 1 to 11, characterized in that the footrests are disposed on the front of the seat so that they can be disassembled. 13.Silla of righting invalid carriages or ill, according to one of claims 1 to 12, characterized in that the footrests have a base and are arranged such that the base rests on the floor in the upright position of the chair . 14.Silla of righting invalid carriages or ill, according to one of claims 1 to 13, characterized in that the footrests have a base whose height can be adjusted. 15.Silla of righting wheel pair invalids or infirm, according to claim 14, characterized in that the bases of the footrests, adjustable for height, have a guide which is movable on a tubular support for the footing and can be fixed with a set screw. 16.Silla of righting for invalids or patients, according to one of claims 1 to 15, characterized in that the back wheel is connected at least one actuator arranged on the frame with wheels, held in upright position in the back any position of the chair. 17.Silla of righting for invalids or infirm wheels according to claim 16, wherein adjusting member serves at least one parallelogram rod disposed under the seat, which is fixed on the wheeled frame and backrest. 18.Silla righting deruedas, for invalids or infirm, according to one of claims 9-17, characterized in that the footrests can be joined together by means of a pin. 19.Silla of righting invalid carriages or infirm.
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