DEVICE FOR TRANSPORTATION OF LOADS UP/DOWN FLIGHTS OF STAIRS Russian patent published in 2008 - IPC B62B5/02 B62B3/06 

FIELD: transport engineering.

SUBSTANCE: design trolley has vertical frame 1 and horizontal frame 2 rigidly connected to each other. Movable frame 3 is hinge connected with horizontal framer 2. Front and rear running gears 4 and 5, respectively, are installed on movable and vertical frames, respectively. Screw mechanism is installed between horizontal frame 2 and movable frame 3 and it provides any position of trolley in range normal state when front and rear running gears 4 and 5 are at maximum distance from each other to folded state in which front and rear running gears 4 and 5 are moved close to each other, and provision is made to support trolley on swivel wheel 16 of vertical frame 1 at confined space on stairs landing. Rear running gears 5 on flat surface rest on two wheels. Planetary mechanism of rear running gear 5 provides rotation of wheels, and when wheel rests on step of stairs, planetary mechanism provides locking of wheel with possibility of placing other wheel on following step. Rear running gears 5 are driven from output shaft of geared motor rigidly secured on horizontal frame 2. Torque is conveyed through gear installed on output shaft and gear wheel installed on main axle of rear running gear 5 with planetary mechanism. Front running gears 4 are provided with three wheels spaced through 120° relative to each other. Load can be fastened on proposed device.

EFFECT: possibility of carrying heavy loads at confined space for turning on stairs landings.

5 dwg