Transport apparatus especially for goods, capable of travelling over stairs

Abstract From the Canadian patent

A transport apparatus having a loading bridge is movable, by hand for transporting loads over stairs. There are two front: rollers, which are either extendable or variable in their angular position, and two rear rollers which are, secured to downwardly extending arms. The loading bridge takes up a rearwardly tilted position when the transport apparatus rests with the rollers on a horizontal surface. The spacing between the front and rear rollers and the roller diameters are selected so that, when climbing a stair the front, rollers rest on an upper tread while the rear rollers simultaneously rest on a lower tread. When the apparatus is not in use, it may be folded to take up but a small …