Method and apparatus for the pressure moulding of articles

Claim 1

A METHOD OF PRESSURE MOULDING AN ARTICLE HAVING A LOWER FACE ABND AN UPPER CONCAVE FACE AND HAVING A PERIPHERAL WALL WITH AN IRREGULAR EDGE ON SAID UPPER FACE, VARYING IN HEIGHT IN RELATION TO THE LOWEST POINT ON SAID UPPER FACE, WHICH METHOD COMPRISES PROVIDING A MOULD CAVITY HAVING A BASE CONORMING IN SIZE AND SHAPE WITH SAID LOWER ARTICLE FACE AND AN IRREGULAR UPPER EDGE WHICH CONFORMS IN SIZE, SHAPE AND HEIGHT WITH SAID ARTICLE EDGE, PLACING A REQUISITE QUAANTITY OF MOUNDABLE MATERIAL IN SAID CAVITY, APPLYING MOULDING CONCAVING PRESSURE TO SAID MATARIAL INTERNALLY OF AND THROUGH AN UPWARD EXTENSION OF SAID MOULD CAVITY CONFORMABLY FORMING WITH SAID MOLD CAVITY DGE A JUNCTION NEAR THE TOP OF SAID MOULD CAVITY, SAID PRESSURE BEING APPLIED OVER AN AREA OF SAID MATERIAL, COOEXTENSIVE WITH THE AREA OF SAID CONCAVE FACE TO FORM SAID MATERIAL INTO A MOUNDED BODY HAVING SHAPE CORRESPONDING TO THAT OF SAID ARTICLE WITH THE SAME LOWER FACE AND THE SAME UPPER CONCAVE FACE, AND WITH THE SAME IRREGULAR UPPER FACE EDGE, AND HAVING AN INHERENT JUNCTION MARK, WHICH IS IMPRESSED AROUND THE PERIPHERAL WALL OF SAID MOULDED BODY AND WHICH IS LOCATED IN THE REGION OF ITS UPPER FACE EDGE AND FOLLOWS THE SAME IRREGULAR FROM AS THE UPPER FACE EDGE OF SAID MOULDED BODY, SO THAT THE DISTANCE BETWEEN THE UPPER FACE EDGE OF SAID MOUNDED BODY AND THE IMPRESSED JUNCTION MARK IS CONSTANT AROUND ENTIRE PERIPHERY OF THE MOULDED BODY, SEPARATING SAID UPWARD EXTENSION FROM SAID MOULD CAVITY TO OPEN UP SAID MOULD CAVITY AROUND ITS UPPER EDGE, AND REMOVING THE MOULDED BODY FROM THE MOULD CAVITY.

Claim 2

A METHOD OF PRESSURE MOULDING AN ARTICLE HAVING A LOWER FACE ABND AN UPPER CONCAVE FACE AND HAVING A PERIPHERAL WALL WITH AN IRREGULAR EDGE ON SAID UPPER FACE, VARYING IN HEIGHT IN RELATION TO THE LOWEST POINT ON SAID UPPER FACE, WHICH METHOD COMPRISES PROVIDING A MOULD CAVITY HAVING A BASE CONORMING IN SIZE AND SHAPE WITH SAID LOWER ARTICLE FACE AND AN IRREGULAR UPPER EDGE WHICH CONFORMS IN SIZE, SHAPE AND HEIGHT WITH SAID ARTICLE EDGE, PLACING A REQUISITE QUAANTITY OF MOUNDABLE MATERIAL IN SAID CAVITY, APPLYING MOULDING CONCAVING PRESSURE TO SAID MATARIAL INTERNALLY OF AND THROUGH AN UPWARD EXTENSION OF SAID MOULD CAVITY CONFORMABLY FORMING WITH SAID MOLD CAVITY DGE A JUNCTION NEAR THE TOP OF SAID MOULD CAVITY, SAID PRESSURE BEING APPLIED OVER AN AREA OF SAID MATERIAL, COOEXTENSIVE WITH THE AREA OF SAID CONCAVE FACE TO FORM SAID MATERIAL INTO A MOUNDED BODY HAVING SHAPE CORRESPONDING TO THAT OF SAID ARTICLE WITH THE SAME LOWER FACE AND THE SAME UPPER CONCAVE FACE, AND WITH THE SAME IRREGULAR UPPER FACE EDGE, AND HAVING AN INHERENT JUNCTION MARK, WHICH IS IMPRESSED AROUND THE PERIPHERAL WALL OF SAID MOULDED BODY AND WHICH IS LOCATED IN THE REGION OF ITS UPPER FACE EDGE AND FOLLOWS THE SAME IRREGULAR FROM AS THE UPPER FACE EDGE OF SAID MOULDED BODY, SO THAT THE DISTANCE BETWEEN THE UPPER FACE EDGE OF SAID MOUNDED BODY AND THE IMPRESSED JUNCTION MARK IS CONSTANT AROUND ENTIRE PERIPHERY OF THE MOULDED BODY, SEPARATING SAID UPWARD EXTENSION FROM SAID MOULD CAVITY TO OPEN UP SAID MOULD CAVITY AROUND ITS UPPER EDGE, AND REMOVING THE MOULDED BODY FROM THE MOULD CAVITY.

Claim 3

AN APPARATUS FOR PRESSURE MOULDING AN ARTICLE, WHICH COMPRISES A MOULD BODY DEFINING A MOULD CAVITY FOR RECEIVING A CHARGE OF MOULDABLE MATERIAL, SAID MOULD CAVITY HAVING A BASE AND AN UPSTANDING PERIPHERAL WALL OF HEIGHT VARYING RELATIVE TO THE DEEPEST POINT OF THE MOULD CAVITY TO DEFINE AN UPPER EDGE OF CORRESPONDING VARYING HEIGHT, A MOULD RING REMOVABLE FROM SAID MOUND BODY AND HAVING A HOLLOW, WHICH IS OPERATIVE POSITION OF SAID RING CONSTITUTES AN UPWARD EXTENSION OF SAID MOULD CAVITY, SAID RING HAVING A LOWER EDGE CONFORMING IN CONTOUR WITH THE FOLLOWING THE UPPER EDGE OF SAID MOULD CAVITY, AND IN OPERATIVE POSITION BEING SEATED ON SAID MOULD BODY TO FORM A JUNCTION BETWEEN SAID CONFORMING EDGES, A PLUNGER IN SAID RING HAVING A SNUG COMFORMING SLIDE FIT THEREIN, AND HAVING A LOWER MOULDING COMVEX FACE PERIPHERALLY BOUNDED BY AN EDGE CONFORMING A CONTOUR WITH THE FOLLOWING THE UPPER EDGE OF SAID MOULD CAVITY. THE PLUNGER BEING SLIDABLE THROUGH THE MOULD RING TO APPLY MOULDING PRESSURE TO THE CHARGE OF MOULDING MATERIAL IN SAID CAVITY, MEANS FOR MOVING THE MOULD RING TOWARDS AND AWAY FROM THE MOULD RING, AND MEANS FOR SLIDING THE PLUNGER IN THE RING AWAY FROM SAID MOULD BODY AND TOWARDS SAID MOULD BODY TO A FINAL MOULDING POSITION IN WHICH THE PERIPHERAL EDGE OF THE MOLDING FACE OF THE PLUNGER IS ADJACENT TO AND CONFORMABLY FOLLOWS THE UPPER EDGE OF SAID MOULD CAVITY AS WELL AS SAID JUNCTION, WHERE BY THE DISTANCE BETWEEN SAID JUNCTION AND THE MOULDING FACE EDGE OF SAID PLUNGER IN SAID FINAL MOULDING POSITION OF SAID PLUNGER IS CONSTANT AROUND THE ENTIRE PERIPHERY OF SAID MOULD CAVITY, AND THE CHARGE OF MOULDABLE MATERIAL IN SAID MOULD CAVITY WILL BE SHAPED INTO AN ARTICLE HAVING AN UPPER CNCAVE FACE WITH A PERIPHERAL EDGE VARYING IN HEIGHT RELATIVE TO THE DEEPEST POINT ON SAID CONCAVE FACE, AND THE PERIPHERAL WALL OF SAID ARTICLE WILL HAVE IMPRESSED THEREON AN INHERENT JUNCTION MARK OF HEIGHT-VARYING FORM LOCATED IN THE REGION OF AND CONFORMABLY FOLLOWING THE PERIPHERAL EDGE OF THE CONCAVE FACE OF SAID ARTICLE.

Claim 4

AN APPARATUS FOR PRESSURE MOULDING AN ARTICLE, WHICH COMPRISES A MOULD BODY DEFINING A MOULD CAVITY FOR RECEIVING A CHARGE OF MOULDABLE MATERIAL, SAID MOULD CAVITY HAVING A BASE AND AN UPSTANDING PERIPHERAL WALL OF HEIGHT VARYING RELATIVE TO THE DEEPEST POINT OF THE MOULD CAVITY TO DEFINE AN UPPER EDGE OF CORRESPONDING VARYING HEIGHT, A MOULD RING REMOVABLE FROM SAID MOUND BODY AND HAVING A HOLLOW, WHICH IS OPERATIVE POSITION OF SAID RING CONSTITUTES AN UPWARD EXTENSION OF SAID MOULD CAVITY, SAID RING HAVING A LOWER EDGE CONFORMING IN CONTOUR WITH THE FOLLOWING THE UPPER EDGE OF SAID MOULD CAVITY, AND IN OPERATIVE POSITION BEING SEATED ON SAID MOULD BODY TO FORM A JUNCTION BETWEEN SAID CONFORMING EDGES, A PLUNGER IN SAID RING HAVING A SNUG COMFORMING SLIDE FIT THEREIN, AND HAVING A LOWER MOULDING COMVEX FACE PERIPHERALLY BOUNDED BY AN EDGE CONFORMING A CONTOUR WITH THE FOLLOWING THE UPPER EDGE OF SAID MOULD CAVITY. THE PLUNGER BEING SLIDABLE THROUGH THE MOULD RING TO APPLY MOULDING PRESSURE TO THE CHARGE OF MOULDING MATERIAL IN SAID CAVITY, MEANS FOR MOVING THE MOULD RING TOWARDS AND AWAY FROM THE MOULD RING, AND MEANS FOR SLIDING THE PLUNGER IN THE RING AWAY FROM SAID MOULD BODY AND TOWARDS SAID MOULD BODY TO A FINAL MOULDING POSITION IN WHICH THE PERIPHERAL EDGE OF THE MOLDING FACE OF THE PLUNGER IS ADJACENT TO AND CONFORMABLY FOLLOWS THE UPPER EDGE OF SAID MOULD CAVITY AS WELL AS SAID JUNCTION, WHERE BY THE DISTANCE BETWEEN SAID JUNCTION AND THE MOULDING FACE EDGE OF SAID PLUNGER IN SAID FINAL MOULDING POSITION OF SAID PLUNGER IS CONSTANT AROUND THE ENTIRE PERIPHERY OF SAID MOULD CAVITY, AND THE CHARGE OF MOULDABLE MATERIAL IN SAID MOULD CAVITY WILL BE SHAPED INTO AN ARTICLE HAVING AN UPPER CNCAVE FACE WITH A PERIPHERAL EDGE VARYING IN HEIGHT RELATIVE TO THE DEEPEST POINT ON SAID CONCAVE FACE, AND THE PERIPHERAL WALL OF SAID ARTICLE WILL HAVE IMPRESSED THEREON AN INHERENT JUNCTION MARK OF HEIGHT-VARYING FORM LOCATED IN THE REGION OF AND CONFORMABLY FOLLOWING THE PERIPHERAL EDGE OF THE CONCAVE FACE OF SAID ARTICLE.