Patent ID: 7075202

Claim:
A mixer/stirrer motor and reducer, for mixer and stirrer building machines, the motor reducer comprising: an electric motor with rotor and stator and a motor shaft; an electric motor casing with said rotor and stator being disposed therein; a reducer with a gear train connected to an output shaft for moving a mixing tank and with a connecting part with a shaft bearing supporting said motor shaft; a box-shaped shell made of insulating material having plural sides surrounding said electric motor casing and with an lateral open end; a flange made of electrically insulating material interposed between the motor and said connecting part of the reducer and connected to each of said connecting part of said reducer and said electric motor casing providing an insulated connection to electrically insulate said electric motor and electric motor casing from said reducer pear train; electrically insulating material means interposed between said gear train and said rotor for electrically isolating said reducer from said motor, wherein said motor shaft is fixed to said rotor, coaxially therewith, said electrically insulating material means comprising a bush made of insulating material fitted on said shaft and interposed between said rotor and said motor shaft; and wherein said bush extends over an entire length of said motor shaft continuously from beyond said shaft bearing supporting said motor shaft at said connecting part to beyond another bearing supporting said motor shaft and to insulate said shaft bearing and said another bearing from said rotor.