Molds for the production of dishes and the like from powdered ceramic materials

Claim 1

A mold for pressing ceramic dishes and the like from powder ceramic material, comprising two cylindrical dies of substantially identical diameters, each having a longitudinal axis and being coaxially positioned with each other, at least one of said dies being displaceable with respect to the other between an open and closed positions, said dies having end walls being shaped as to reproduce, in negative, respectively the front and the rear walls of the dish to be produced and to define a cavity between said walls when said dies are in said closed position; a main die-box encircling said cylindrical dies and adapted to slide along said longitudinal axes for peripherally closing said cavity, said main die-box including a conduit for feeding the powdered ceramic material into said first cavity; and an auxiliary die-box encircling at least one of said dies and adapted to be displaced along said longitudinal axes towards and from of said main die-box, said main die-box and said auxiliary die-box formed with annular grooves facing towards each other and open towards said dies, said grooves being conformed with each other, so that in said closed position they form an annular cavity being in registry with said cavity and radially extending therefrom whereby said annular cavity forms the peripheral border of the dish to be produced.