Machine for producing frozen beverages

Claim 1

A machine for preparing and delivering frozen beverages, such as water-ices, comprising a tank for holding and cooling the beverage, and in which tank there is mounted an evaporator of a refrigerating circuit and a rotatable beverage mixing propeller the rotation shaft of which has one end thereof coupled coaxially through a tank wall, with a registering end of the rotation shaft of an electric reduction motor, characterized in that the registering ends of said shafts are rotatably supported in opposite sides, respectively, of said wall, and the coupling between the rotation shaft of the reduction motor and the rotation shaft of the propeller is of a magnetic type comprising a first plurality of magnets secured to the motor shaft, and a second plurality of magnets secured to the propeller shaft, said first and second pluralities of magnets facing each other in a direction transverse to their respective rotation axes, and being operative to transmit to said propeller a predetermined rotation torque, and to permit rotation of said propeller to cease while permitting the shaft of said motor to continue to rotate when said predetermined rotation torque has been exceeded.