Abstract: A concrete block molding machine including: a gate-type frame constituting the body of the apparatus; a rail frame extending to right and left from the gate-type frame and; a pair of presses slidably mounted on the rail frame and adapted to move along the rail frame by the action of hydraulic cylinders in such a manner that when one of the presses is on a molding machine held by the gate-type frame, the other press is stationed at a position where a pressing member and a molding box of a changeable mold assembly are changed; and resilient clampers by which the molding box placed on the molding machine is attached to a vertically movable table device. In such an arranged construction, the mold changing operation can be carried out in a reduced time and complicated and laborious work is eliminated.

Abstract: An apparatus for molding concrete-blocks within a molding box which is suspended, whereby vibrations are applied to the molding box uniformly in all the directions, that is, up and down, left and right, back and forth during the molding process. Uneven distribution of the concrete aggregates is avoided and homogeneous, high density and high quality concrete-blocks can be molded efficiently. Furthermore, this apparatus is provided with means to prevent transmission of the vibrations to the apparatus body.