Patent ID: 7823421

Claim:
A washing apparatus comprising: an outer casing being disposed to contain cleaning liquid containing a surfactant; a cylindrical basket-like washing tub being disposed in the outer casing; a plurality of protruding portions protruding from an inner periphery of the cylindrical basket-like washing tub in a radial direction of the cylindrical basket-like washing tub and extending along an axial direction of the cylindrical basket-like washing tub; a rotating mechanism for rotating the cylindrical basket-like washing tub about a central shaft in the outer casing while supporting the cylindrical basket-like washing tub in such a manner that the central shaft of the cylindrical basket-like washing tub is held horizontally; a sensor being diagnosed to detect the level of the cleaning liquid in the outer casing; and a controller for starting a rotation of the cylindrical basket-like washing tub rotated by the rotating mechanism when the cylindrical basket-like washing tub is full of the cleaning liquid and for controlling a rotation speed of the cylindrical basket-like washing tub by the rotating mechanism so that a peripheral speed of the inner periphery of the cylindrical basket-like washing tub is from 28 meter/min to 57 meter/min.