Apparatus for mixing foundry mould substances

An apparatus for mixing foundry mould substances, in particular sand and a binding agent, comprising:

• a container having two mixing spaces and a drive shaft extending therethrough;
• at least two mixing tools projecting substantially radially from said drive shaft and being rotatable with said drive shaft;
• said mixing tool having a free end with a substantially planer first edge;
• spaced apart fitment bodies of small lateral extent projecting from a wall of the container;
• said fitment bodies lying in a first plane which divides said container into said two mixing spaces, said first plane being substantially parallel to a second plane containing said first edge;
• said mixing tools conveying said substances being mixed from a first one of said mixing spaces to a second one of said mixing spaces while said substances are being mixed;
• said fitment bodies producing strong shearing and frictional forces which cause rapid and intensive mixing of said substances while keeping the wall of the container free from caked-on deposit and brake rotary movement of the substances being mixed;
• and
• the fitment bodies being provided between said at least two mixing tools which project in adjacent relationship from the drive shaft and each of which rotates in one of said mixing spaces.