WASHING MACHINE Russian patent published in 2007 - IPC D06F37/22 

FIELD: mechanical engineering.

SUBSTANCE: washing machine has casing incorporating main electric engine, tank including washing drum, heating member, level sensor, control unit and drum balancing device. The latter includes movable counterweight and hollow shaft with guides formed on shaft end and extending perpendicular to its axis. Slide with toothed rack is adapted for moving in guides. Washing drum is mounted on pin positioned within hollow shaft for independent rotation by means of main electric engine. Counterweight is fixed on upper part of slide for radial displacement relative to drum and rotation around its outer surface by means of two simultaneously operating additional electric engines. One of said electric engines is mounted on surface of hollow shaft and is connected through reducer and toothed transmission to slide rack. Other electric engine is connected to hollow shaft through belt transmission. Control unit is adapted for determining unbalance position and weight.

EFFECT: substantial reduction in metal usage owing to elimination of heavy counterweights from machine design, decreased dynamic loading and improved operating characteristics of machine.

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