EXTRUDER FOR MANUFACTURE OF CONCRETE SLABS Russian patent published in 1994 - IPC

FIELD: manufacture of building products. SUBSTANCE: extruder for manufacture of concrete slabs has movable frame with bin for feeding building mixture, fixed molding base, side molding members in the form of lengthwise rims positioned along the base on both its sides, at least one auger with hole-forming cores on its free end located between the rims, drive of relative reciprocating motion of hole-forming cores and lengthwise rims. In this case adjacent surfaces of at least two side molding members have at least one pair of counter position sectors having V-shaped longitudinal section and forming inner space between them. V-shaped sector of side surface of hole-forming cores is formed by two truncated cones connected to each other with their smaller bases. Its sloping side is the first in the direction of molding and its angle of slope is bigger than angle of slope of the second side. EFFECT: enhanced operating capability. 7 cl, 8 dwg