Patent ID: 7108496

Claim:
A stack mould assembly ( 1 , 2 , 3 , 4 ) comprising; a first mould block ( 1 ) having at least two first part mould cavities ( 11 A) therein for forming part of a toothbrush head therein, at least one such first part mould cavity ( 11 A) being respectively in each of two opposite-facing surfaces ( 1 A, 1 B) of the first mould block ( 1 ); a second mould block ( 2 ) having at least one second part mould cavity ( 21 ) therein for forming part of a toothbrush handle therein, the first ( 11 A) and second ( 21 ) part mould cavities capable of mating together to form a part mould cavity ( 11 A, 21 ) defining part of the head and handle of a toothbrush to be formed therein; a third mould block ( 3 ) having at least one third part mould cavity ( 31 ) therein for forming part of a toothbrush therein, the third part mould cavity ( 31 ) capable of mating together with the first and second part mould cavities ( 11 A, 21 ) to form a part mould cavity ( 11 A, 21 , 31 ) defining part of the head and handle of a toothbrush to be formed therein; a fourth mould block ( 4 ) having at least one fourth part mould cavity ( 41 ) therein for forming part of a toothbrush, the fourth part mould cavity ( 41 ) and first part mould cavity ( 11 A) being capable of mating together to form a part mould cavity ( 11 A, 41 ) defining part of the head and handle of a toothbrush to be formed therein; the said first ( 1 ), second ( 2 ), third ( 3 ) and fourth ( 4 ) mould blocks being arranged in a stack mould assembly such that the first ( 1 ) and second ( 2 ) mould blocks are intermediate in a stack between the said third ( 3 ) and fourth ( 4 ) mould blocks; a fifth part mould cavity ( 51 ) being provided in a mould block ( 2 ), the fifth part mould cavity ( 51 ) capable of mating together with the first and fourth part mould cavities ( 11 A, 41 ) to form a part mould cavity ( 41 , 51 ) defining part of the head and handle of a toothbrush to be formed therein.