Patent ID: 8020494

Claim:
An anti-roll back (ARB) assembly for use with vehicles that ride on a track including an ARB portion adapted with a plurality of ARB pins, comprising: a linear magnet assembly positioned along the track in the ARB portion, the linear magnet assembly comprising a pair of magnet arrays spaced apart to define a slot extending the length of the linear magnet assembly; an ARB element having a body pivotally supported on a frame of one of the vehicles; an electrically conductive reaction plate supported on the frame of the vehicle and positioned such that the reaction plate passes through the slot when the vehicle travels on the track over the ARB portion, wherein the reaction plate is connected to the ARB element and the ARB body pivots in response to movement of the reaction plate to position the ARB body relative to the frame of the vehicle; a slide bar supporting the reaction plate on the vehicle; and a linkage assembly connecting the reaction late to the ARB body, wherein the movement of the reaction plate in response to magnetic forces in the slot is a linear movement along the slide bar and wherein the linkage assembly translate the linear movement of the reaction plate into a rotational displacement of the ARB body.