the subject of the invention is a wheelchair for mobility on the surface of the flat and down the stairs, a three wheeled cart, and especially to the method of determining the main dimensions of this package. wheelchair is a chair supporting structure (1), a frame (25) uchyln\u0105 with shaft (29) and two sets tr\u00f3jko\u0142owymi front (30) and two sets of three wheeled rear (39).is characterized by the fact that the front wheels (22) are in widelcach feedback, and the rear wheels (23) have rims and are u\u0142o\u017cyskowane on czopach propulsion shaft core (40), and sets three wheel trolley are sets. at the time of the rear wheels are coupled with a shaft (40) k\u0142owymi clutches (44), and in the alternative electromagnetic clutches.an actuator (31) repeals the frame (25) of the angle (?) approximately 60 degrees and is driven manually, and another option electrically. the rear wheels are driven electrically, and the other options manually by the user. the main shaft (40) drives the lower shaft (49), which rotates the shaft (29) with sets of front and rear sets (30) (39).in traffic on the surface of the flat clutch are excluded, the frame (25) is raised, and rotate only the driving wheels. sets of tricycles are characterised by the fact that they have wheels connected rigidly with the yoke arms. a method for determining the main dimensions (r and d) set of three wheel takes into account the amount (h) and a width (s) steps, to allow independent movement up and down the stairs.Przedmiotem wynalazku jest osobisty wózek inwalidzki do poruszania się po powierzchni płaskiej i po schodach, zestaw trójkołowy zwłaszcza do tego wózka oraz metoda ustalania głównych wymiarów tego zestawu. Wózek inwalidzki ma fotel z konstrukcją nośną (1), ramę uchylną (25) z wałem (29) i dwoma zestawami trójkołowymi przednimi (30) oraz dwa zestawy trójkołowe tylne (39). Charakteryzuje się tym, że koła przednie (22) są w widelcach zwrotnych, a koła tylne (23) mają obręcze napędowe i są u
