Patent ID: 7909669

Claim:
A differential displacement electromagnetic device providing motion over a support frame, said device comprising: a planar rectangular support frame defining a lengthwise axis and a central aperture; first and second integral rails fixedly mounted to said support frame in spacedly parallel fashion relative to one another; an open quadrangular carriage, spacedly overhanging over said support frame in sliding fashion; permanent electromagnets, fixedly mounted to opposite ends of said carriage and angularly oriented relative to said support frame lengthwise axis; two first and second pairs of upright anchor columns, mounted to and projecting transversely from opposite ends of said support frame, said first pair of anchor columns interconnected by first biasing means, while said second pair of anchor columns interconnected by second biasing means; a movable block, slidingly carried over both said rails and sized to freely engage said support frame aperture for sliding motion thereabout independently of said carriage, said block including a pair of opposite side spring loaded arms, extending outwardly over and beyond said carriage and carrying at each of their opposite ends a pair of opposite floating electromagnets, said floating electromagnets hanging freely spacedly over said support frame and clearing said casing; said block further including a bracket mount carrying two spaced pivotal axles defining pivotal axes transverse to the plane of said support frame, and a pair of fixed rocker arms, pivotally mounted to said block at one end by pivotal axles 62 , 64 , with each rocker arms carrying at each of their opposite ends a corresponding permanent magnet; wherein said rocker arms are sized in such a way as to be pivotably movable between a first limit position, where said permanent magnets abut against said angularly oriented electromagnets, and a second limit position, where said permanent magnets abut against said floating electromagnets.