A stair-climbing device for a wheelchair, a wheelchair suitable for installing such a stair-climbing device and a wheelchair equipped with such a stair-climbing device
The object of the invention is a stair-climbing device (1) for moving a wheelchair (2) on stairs by means of muscular force of a person sitting on the wheelchair (2) or by means of an electric drive assembly (76) without the assistance of third party. The stair-climbing device (1) comprises two crawler units (89), which are connected with each other by a drive axle (44)； connecting units comprising an attachment devices (17) mountable on each hub of the main wheel (4) of the wheelchair (2) and a holders (26) for rotational mounting on the main wheel (4) to each attachment device (17) and comprising main arms (31) mounted slidingly in the holders (26) and rotationally connected at one its end with the main axle (44) for manual changing a position of the stair-climbing device (1) in relation to the wheelchair (2) between a transport mode position, stair-climbing mode position and optionally landing mode, if the landing mode is present； a levelling units (105) for setting the attached wheelchair (2) in a horizontal position during stair climbing. The invention also includes a wheelchair (2) suitable for attaching a stair-climbing device (1), wherein the wheelchair (2) comprises a frame (6), main wheels (4), front wheels (5), a seat (3) and a back-rest (8). Moreover, the invention includes a wheelchair (2) with a mounted stair-climbing device (1).
