Machine with mold-section-varying means for manufacture of concrete articles through subsequent compression states

Claim 1

IN A MACHINE FOR THE MANUFACTURE OF ARTICLES OF CONCRETE AND THE LIKE CEMENTITIOUS MATERIAL, WALL MEANS DEFINING AN OPEN-ENDED MOLD INCLUDING AT LEAST ONE LONGITUDINALLY-EXTENDING LATERALLY MOVABLE WALL PART, MEANS MOVABLE LONGITUDINALLY IN SAID MOLD TO COMPRESS SAID MATERIAL IN THE DIRECTION FROM ONE SAID OPEN END TO THE OTHER SAID OPEN END, MEANS FOR MOVING SAID COMPRESSION MEANS WITHIN SAID MOLD, MEANS FOR VARYING THE CROSS-SECTION OF SAID MOLD BY MOVING LATERALLY AT LEAST SAID WALL PART BETWEEN A PREDETERMINED INNER POSITION CORRESPONDING TO THE CROSSSECTION OF THE ARTICLE TO BE MOLDED AND A PREDETERMINED OUTER POSITION, AND MEANS FOR INTRODUCING MATERIAL TO BE MOLDED INTO THE CAVITY DEFINED BY THE WALL MEANS AND THE COMPRESSION MEANS, SAID COMPRESSION MEANS BEING MOVABLE LONGITUDINALLY TO MOLD AND COMPRESS MATERIAL WHEN THE MOLD HAS A CROSS-SECTION CORRESPONDING SUBSTANTIALLY TO THE FACE AREA OF THE COMPRESSION MEANS AND SAID COMPRESSION MEANS BEING OPERABLE TO MOVE THE MOLDED ARTICLE THROUGH THE MOLD ONLY WHEN THE CROSS-SECTION OF THE MOLD IS INCREASED BY SAID MOLD-SECTION-VARYING MEANS WHEREBY FRICTIONAL FORCES ACTION BETWEEN THE MOLDED MATERIAL AND WALL MEANS ARE SUBSTANTIALLY REDUCED.