Mold for use in making die for forming cardboard blanks

Claim 1

A MOLD FOR USE IN MAKING A DIE THAT INCLUDES A DIE BODY HAVING CONVENTIONAL STEEL, BLANK-FORMING RULES THEREIN WITH THE WORKING EDGES OF SAID RULES PROJECTING FROM SAID DIE-BODY FOR FORMING CARTON BLANKS FROM CARDBOARD, COMPRISING; (A) A FLAT-SIDED SLAB-LIKE BODY OF HARD PLASTIC MATERIAL; (B) A PLURALITY OF GROOVES FORMED IN ONE FLAT SIDE OF SAID BODY; (C) SAID GROOVES CORRESPONDING EXACTLY IN LINEAR CONTOUR AND IN CROSS SECTIONAL CONTOUR TO THE WORKING EDGES OF THE BLANK FORMING RULES IN THE DIE TO BE FORMED, AND TO THE MARGINAL PORTIONS OF SAID RULES ALONG SAID WORKING EDGES; AND (D) THE DEPTHS OF SAID GROOVES BEING EQUAL TO THE DISTANCES SAID WORKING EDGES OF SAID RULES ARE TO PROJECT FROM THE DIE-BODY OF THE DIE TO BE FORMED; (E) MEANS INTEGRAL WITH SAID SLAB-LIKE BODY POSITIONED WITHIN THE CONFINES OF THE OUTLINE OF SAID BODY FOR REMOVABLY AND RIGIDLY SUPPORTING RIGID FRAME MEMBERS OF RECTANGULAR CROSS SECTIONAL CONTOURS ON SAID SLAB-LIKE BODY PROJECTING TO THE SAME SIDE OF SAID SALB-LIKE BODY AS THAT IN WHICH SAID GROOVES ARE FORMED AND IN A POSITION ENCLOSING THE AREA IN WHICH SAID GROOVES ARE LOCATED.