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An apparatus for mixing molding sand which comprises a mixing vessel having a mixing tool disposed within the mixing vessel, the mixing tool comprises an elongated shaft having a plurality of blades arranged along the elongated shaft wherein each of the plurality of blades comprises two opposed iden

An apparatus for mixing molding sand which comprises a mixing vessel having a mixing tool disposed within the mixing vessel, the mixing tool comprises an elongated shaft having a plurality of blades arranged along the elongated shaft wherein each of the plurality of blades comprises two opposed identical blade portions fitted to each other by a form fitting connection at a location adjacent the elongated shaft. The form fitting connection includes a groove and a lug on each of the opposed blade portions wherein the lug on one of the opposed blade portions engages the groove on the other opposed blade portion. The groove and lug form in part a peripheral surface of a polygonal recess on the form fitting connection which surface abuts the elongated shaft of the mixing tool when the opposed blade portions are secured to the shaft.

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An apparatus for mixing molding sand so as to prepare a fluid molding sand mixture comprises a mixing vessel and first mixing means disposed within said mixing vessel, said first mixing means comprises an elongated shaft about a longitudinal axis B and a plurality of blades arranged along said longi

An apparatus for mixing molding sand so as to prepare a fluid molding sand mixture comprises a mixing vessel and first mixing means disposed within said mixing vessel, said first mixing means comprises an elongated shaft about a longitudinal axis B and a plurality of blades arranged along said longitudinal shaft, each of said plurality of blades comprises two overlapping opposed blade portions having connecting means for fixing said opposed blade portions to said elongated shaft for rotation therewith and to each other, said connecting means includes a groove, a lug extending traversely to said longitudinal axis B wherein the lug of each of said opposed blade portions engages in the groove of the other of said opposed blade portions, and said opposed blade portions defining a polygonal recess for receiving said elongated shaft wherein the groove and lug form in part a peripheral surface of the polygonal recess which surface abuts said elongated shaft.