AUTOMATIC BRAKE OF VEHICLE, INTENDED MAINLY FOR CARRYING PERSONS ON STAIRCASES Russian patent published in 2012 - IPC A61G5/06 

FIELD: transport.

SUBSTANCE: invention relates to brakes driven automatically in loss of contact with bearing surface. Automatic brake comprises levers with thrust rollers on their free ends pivoted on vehicle frame, askew and afore of vehicle wheels to be changed from top idle position, e.g. outside of staircase flyer, into working bottom position on said flyer with roller rolling on step or other bearing surface next to wheels and falling and hanging above lower step or bearing surface. Said levers may be locked in top idle position by springs. It comprises pairs of active and passive elements. The latter interact and are coupled with said levers to prevent wheels rotation with thrown-in brake and interaction of active elements when lever enters preset range of angles of its turn downward to limiting value corresponding to preset tolerable support level decrease under lever roller. Every said pair of passive and active elements is made up of ratchet mechanism with its gear wheel engaged with vehicle wheel while pawl is pivoted to level and normally disengaged from ratchet wheel by return spring. Extra double-arm lever is arranged on every lever. One arm of the former is directed downward and up while its free end engages with pawl rear. Another arm is directed forward and down and spring loaded to frame thrust that makes additional lever turn limiter. Arm is furnished with thrust roller on free end to make said roller arranged above common horizontal plane, tangential to wheel bottom points and those of lever roller and to create force contact with bearing surface when lever enters preset range of angles of its turn downward to limiting value corresponding to preset tolerable support level decrease under lever roller. Said extra lever acts on pawl against return mechanism elastic force to throw in ratchet mechanism.

EFFECT: higher efficiency and reliability.

4 cl, 2 dwg