Washing machine tank provided wtih external reinforcing cap on bottom wall

Abstract

The present invention relates to a washing machine tank ( 1 ), of the type provided with a basically cylindrical structure obtained by moulding plastic materials, designed to house a rotary metal drum, characterised in that it is provided with a smooth bottom wall ( 2 ) with central hole, against which a circular cap ( 3 ) is exactly engaged and permanently fixed with concavity facing the bottom wall, with a cylindrical nozzle in central position designed to be perfectly aligned with the central hole of the bottom wall.

1 . Washing machine tank comprising:
 a basically cylindrical structure ( 1 ) obtained by moulding plastic materials, designed to house a rotary metal drum, said cylindrical structure ( 1 ) being provided with a smooth bottom wall ( 2 ) with a central hole ( 2   a ) and   a cap ( 3 ) exactly engaged and permanently fixed to said bottom wall ( 2 ) of the cylindrical structure ( 1 ), said cap ( 3 ) having a cylindrical nozzle ( 3   b ) in central position designed to be perfectly aligned with the central hole ( 2   a ) of the bottom wall ( 2 ), wherein said cap ( 3 ) is obtained by moulding plastic materials, said cap ( 3 ) being fixed in external position, against to said bottom wall ( 2 ) of the cylindrical structure ( 1 ) by means of gluing, welding or screwing, said cap ( 3 ) having a concave side facing the smooth bottom wall ( 2 ) of said cylindrical structure ( 1 ).   
     
     
         2 . Washing machine tank as claimed in  claim 1 , wherein the nozzle ( 3   b ) of the cap ( 3 ) houses a metal bearing support (SP). 
     
     
         3 . Washing machine tank as claimed in  claim 1  wherein the cap ( 3 ) is provided with a series of spokes ( 3   a ) starting from the central nozzle ( 3   b ) with corresponding cavities facing the bottom wall ( 2 ) of the tank ( 1 ). 
     
     
         4 . Washing machine tank as claimed in  claim 3 , wherein the spokes ( 3   a ) of the cap ( 3 ) are coupled at the ends with an annular border ( 3   c ) with cavity facing the bottom wall ( 2 ) of the cylindrical structure ( 1 ). 
     
     
         5 . Washing machine tank as claimed on  claim 4 , characterised in that the central nozzle ( 3   b ) of the cap ( 3 ) is longer than the height of the annular border ( 3   c ) and, consequently, the spokes ( 3   a ) have a decreasing height from the centre to the peripheral area. 
     
     
         6 . Washing machine tank as claimed in  claim 4 , wherein the annular border ( 3   c ) of the cap ( 3 ) is provided with appendixes ( 4 ,  5 ,  6 ) used to mount the fixing means to the bearing structure of the washing machine and the electrical motor. 
     
     
         7 . Washing machine tank as claimed in  claim 5 , wherein the appendixes ( 4 ,  5 ,  6 ) have a basically cylindrical structure parallel to the central nozzle ( 3   b ) of the cap ( 3 ) and are provided with relevant axial holes ( 4   a ,  5   a ,  6   a ) used to insert screws or similar fixing means. 
     
     
         8 . Washing machine tank as claimed in one or more of the  claim 4 , wherein a first opposite pair ( 4 ) of appendixes designed to receive the fixing means of the bearing structure of the washing machine protrudes directly from the annular border ( 3   c ) of the cap ( 3 ) and a second opposite pair ( 5 ) of appendixes protrudes at a lower height protruding on the front of corresponding small arms ( 5   b ) that protrude radially from the annular border ( 3   c ). 
     
     
         9 . Washing machine tank as claimed in  claim 5 , wherein the appendixes ( 6 ) designed to favour the mounting of an electrical motor protrude from corresponding small arms ( 6   b ) that protrude radially from the annular border ( 3   c ) of the cap ( 3 ). 
     
     
         10 . Washing machine tank as claimed in  claim 1 , wherein the small radial arms ( 5   a ,  6   a ) ( 5   b ,  6   b ) protruding from the cap ( 3 ) are provided with internal cavities facing the bottom wall ( 2 ) of the cylindrical structure ( 1 ) of the tank designed to engage exactly against corresponding ears ( 50   a ,  60   a ) protruding from the border of the bottom wall ( 2 ). 
     
     
         11 . Washing machine tank as claimed in  claim 1 , wherein the cap ( 3 ) is frontally provided with holes ( 3   d ) for direct mounting of a stator (ST) of an electrical motor, with rotor (RT) splined to the shaft of the drum that protrudes slightly from the nozzle ( 3   b ).