Patent ID: 8640857

Claim:
An adjustable loading/unloading mouth, comprising: a first tubular element ( 2 ), provided with a first longitudinal axis (x); a second tubular element ( 3 ), provided with a second longitudinal axis (y); means for connecting ( 4 , 5 , 6 ) between the first and the second tubular elements ( 2 , 3 ) which means for connecting ( 4 , 5 , 6 ) define a spherical surface (S), provided with a centre (O), and which enable the first and the second tubular elements ( 2 , 3 ) to rotate with respect to one another about the centre (O); wherein the means for connecting ( 4 , 5 , 6 ) comprise at least a first connecting element ( 4 ) and at least a second connecting element ( 5 ) which are reciprocally connectable at a joining plane (P) passing through the centre (O) of the spherical surface (S), on which joining plane (P) the first connecting element ( 4 ) and the second connecting element ( 5 ) can rotate with respect to one another about the centre (O), the joining plane (P) being diagonal with respect to the longitudinal axes (x, y) of the first and the second tubular elements ( 2 , 3 ) in a configuration of the mouth in which the longitudinal axes (x, y) are reciprocally aligned, wherein the means for connecting ( 4 , 5 , 6 ) comprise a third connecting element ( 6 ) comprising a tubular body which defines a portion of the spherical surface (S) and is solidly constrained to the second tubular element ( 3 ), and wherein the first, the second and the third connecting elements ( 4 , 5 , 6 ) are predisposed to define a spherical coupling, about the centre (O) of the spherical surface (S), wherein the first connecting element ( 4 ) comprises a first coupling component ( 4 a ), wherein the second connecting element ( 5 ) comprises a second coupling component ( 5 a ), wherein the third connecting element ( 6 ) is arranged internally of the first and the second connecting elements ( 4 , 5 ) which are associated to one another at their respective coupling components ( 4 a , 5 a ), wherein the second connecting element ( 5 ) has a lower edge having a first point (A) and a second point (F), and wherein the angular distance from the first point (A) to the joining plane (P) is less than the angular distance from the second point (F) to the joining plane (P).