Abstract: A flask for producing sand-cast parts. To make unpacking of the cast parts easier and to achieve closer measurement tolerances on the same, baffle plates are provided in at least one part of the conical outside, which baffle plates can be tilted out or opened and project in the tilted-in or closed position inside of the flask. These have during the casting process the function of reinforcing the sand portions. After tilting out gas can escape and can be removed.

Abstract: In mold forming apparatus wherein molding sand contained in a mold flask is subjected to compressive forces, bracer devices acting in opposed relationship against the mold flasks are provided in order to supprt the sides of the flasks against the forces generated therein during compression of the molding sand. The bracer devices act against structural parts of the molding apparatus or machine which are located to be fixed in position relative to the mold flasks during the compression of the sand and the bracer devices are arranged to consist of bracer bolts which are adapted to be brought into engagement against the sides of the mold flasks by wedge devices sliding relative to the fixed structural parts and actuated preferably by fluid pressure means.