US Patent 7131844 Collector ring assembly

A collector ring comprising a non-electrically conductive, non-rotatable slip ring base having a plurality of slip rings mounted thereon with the slip rings decreasing in diameter from the lower end of the base to the upper end of the base. Electrical wires are secured to the slip rings and extend therefrom for connection to a source of power. A slip ring brush holder is rotatably secured to the slip ring base and has a plurality of brush holders mounted thereon which engage the slip rings on the base. Electrical wires extend from the brushes outwardly from the brush holder.