Hydraulic press, particularly for the shaping and pressing of cylindric, or truncated-cone, or like shaped hollow ceramic articles

In a hydraulic press for the shaping and pressing of hollow ceramic articles, the combination of a bed plate fitted with a horizontal table;

• a double acting hydraulic jack fitted below of said table;
• a die having planoparallel front sides, and formed with a recess reproducing the negative outer shape of the article to be shaped and pressed;
• four uprights, slidingly fitted on guides, and by which said die is connected with the piston of said double acting hydraulic jack;
• a prismatic plate, slidingly fitted on said table, and to which at least one axially bored patrix is secured, being a bowl made of an elastically flexible and extensible material, reproducing the negative inner shape of the article to be made, laid on said patrix;
• two parallel, vertically directed columns, secured to said bed plate;
• a cross-member slidingly fitted on said vertical columns, and to which an ejector is secured, consisting said ejector of a cylindric body connected with a piston that can be operated by a pressure fluid, and having a diameter slightly smaller than that of top orifice of die recess, being same ejector fitted co-axially to said recess;
• two pairs of hydraulic jacks, by which said cross-member, bearing said ejector, is moved upwardly and downwardly, respectively;
• stop means for firmly retaining said cross member at the required height, whereby to keep closed the top of die recess while the article is being pressed;
• a hydraulic pump for feeding a pressure fluid throhgh the axial duct of patrix, wherein the elastically flexible and extensible bowl is laid, and a further hydraulic pump, for feeding the pressure fluid to hydraulic jacks by which the cross member, bearing the ejector, is controlled.