Patent ID: 7396023

Claim:
Driving system for passing over obstacles by an invalid chair formed by a seating structure ( 2 ), wheels ( 8 ) arranged on both sides of the seating structure ( 2 ) and at least one front stabilizing wheel ( 10 ), characterized in that the invalid chair is formed by arms ( 6 ) which are securable to the seating structure ( 2 ) on both of seating structure sides and on which shafts of wheels ( 8 ) are arranged slidingly between two end positions, cranks ( 9 ) arranged on both sides of the seating structure ( 2 ), and rotary cross engagement members ( 3 ) which are arranged in rear part of the seating structure ( 2 ) on both sides of the seating structure and have arms which are terminated with adhesive end pieces ( 4 ), wherein each of the cranks ( 9 ) is connected to respective a rotary cross engagement member ( 3 ) arranged on the same side of the seating structure ( 2 ) through a geared transmission ( 5 ) for transmission of rotary movement of the crank ( 9 ) to the rotary cross engagement member ( 3 ), and the geared transmission ( 5 ) is provided with a flap ( 7 ) for preventing reverse rotating of the crank ( 9 ).