STAIR LIFT Russian patent published in 2019 - IPC B66B9/08 

FIELD: hoisting devices.

SUBSTANCE: present invention relates to hoisting devices and can be used for movement of wheelchairs on stair flights and spans with arbitrarily complex trajectory. Stair lift comprises upper and lower tubular guides, bearing frame, swing load-carrying platform, carriage with rollers, motor, worm reduction gear and drive plates. Drive of the carriage includes two drive sprockets of chain transmissions, sprockets of drive rollers, chains of chain transmissions of drive rollers, unit of gear transmissions of top drive rollers, gear transmission of lower driving roller, unit of chain tensioners, upper driving rollers and lower drive roller, mechanism of speed limiter and eccentric catcher. Gear unit of top drive rollers includes main gear, idle gear and two top drive rollers with gear wheels fixed on them. Chain tensioner unit consists of two spring-loaded polyacetal chain tensioners located on one axis. Boards are made as rotary and installed on output shafts of sprockets and gears with possibility of rotation around axis. Upper tubular guide is also used as railing of ladder march. Worm gear motor is made single unit.

EFFECT: invention provides reduced roll slippage and higher reliability.

3 cl, 6 dwg