Apparatus for production of molding materials

Apparatus for mixing a powder and a liquid, said apparatus comprising:

• a hollow casing;
• an electric motor mounted in the casing, said motor having a vertical first drive shaft having a vertical hollow channel extending completely therethrough, the first shaft and channel having a common vertical axis which is a first axis of rotation, the first shaft being rotated about the first axis when the motor is operative, said first shaft having an upper end extending out of and above the casing;
• first and second oppositely disposed arms extending inclinedly upwards in counter-balancing position from a common portion having inner surfaces likewise inclined and facing each other, the bottom portion having a vertical bore in which the upper end of the first shaft is disposed, the bore having an axis aligned with the first axis, the first shaft being secured to the bottom portion, the arms with said portion being spaced above the casing so that rotation of the first shaft causes said arms to rotate about the first axis, each arm serving as a counterbalance for the other;
• a second vertical shaft disposed non-rotatably in said channel, the second shaft being axially aligned with and spaced from the first shaft, the second shaft extending through the vertical bore and having an upper end disposed above the common portion, the second shaft being spaced from said arms;
• a hollow cylindrical mixing vessel having a second axis of rotation whch extends at right angles to the inner surface of one of said arms and is not parallel to the first axis, said powder and said liquid being mixed in this vessel;
• first means securing the vessel to the inner surface of said one arm, the first means and the vessel being rotatable together about the second axis;
• and
• second means coupled to the first means and to the upper end of the second shaft to cause the vessel to rotate about the second axis when the first shaft is rotated about the first axis.