Patent ID: 8336338

Claim:
Front-loading clothes washing machine, comprising: a washing tub ( 1 ) adapted to contain washing liquor and a washload, a rotating drum ( 2 ) contained in said tub and provided with an access opening and a rear wall, the axis of rotation of the drum is inclined upwards toward the access opening, a plurality of internally hollow lifting ribs ( 3 ) applied on to the inner surface of said drum and provided with at least a respective partition wall arranged thereinside, said lifting ribs being comprised of two walls ( 3 A, 3 B) that are inclined relative to each other so as to join with each other along a common side ( 5 ) extending inside said drum, and being further attached to the inner surface of the drum with respective base sides ( 31 A, 31 B), said internally hollow lifting ribs ( 3 ) having apertures ( 7 A, 7 B, 23 , 24 ) to allow the washing liquor to enter the ribs, wherein said respective partition wall is in the shape of a substantially planar quadrangle ( 10 ), a side of which coincides with said common side ( 5 ) of said inclined walls, while an opposite side ( 11 ) lies on the inner surface of said drum in a roughly intermediate position between said walls ( 3 A, 3 B), wherein the lifting ribs are provided internally with a second substantially planar partition ( 33 ) that extends through the respective intersections ( 41 , 42 ) of the base sides with the rear wall of the drum, and with a point ( 51 ) that lies in an intermediate position along the common side ( 5 ), and wherein inside each internally hollow lifting rib, the partition walls ( 10 , 33 ) defining therebetween a volume which is inaccessible to said washing liquor.