BRUSH UNIT Russian patent published in 1997 - IPC

FIELD: electric engineering. SUBSTANCE: device has brush holder with box guides in which brush is located. Said brush is designed as polyhedron. In addition device has pressing member which presses brush against commutator. Backward edge of device has bead with at least one tangential edge which is located in parallel to commutator axis and commutator bars. Its size in axial direction is less than axial size of brush, which tangential size is greater than axial one. Axial edges of brush are located in perpendicular to commutator axis. Its tangential edge are located in center or side of axial position of brush and backward edge. Box guide shape follows brush shape. Tangential edges of brush contact tangential edges of brush holder box guide. Brush body has vertical grooves. Tangential depth of additional brushes of multiple brush packet is not greater than tangential width of minimal value of main brush by size of one or two steps. Said additional brushes are of rectangular shape. EFFECT: increased functional capabilities. 10 cl, 9 dwg