Patent ID: 6042364
Filing Date: 2000-03-28
Classification: B29C

Abstract:
A mold assembly for secondary shaping of a hollow part after primary shaping is performed, said primary shaping including forming split halves of a mold by bringing a sliding mold and a movable mold into a mold registry position such that a male die and a female die of said sliding mold, and a female die and a male die of said movable mold, respectively, face each other and form a pair of cavities into which a mold material is injected to form a first split half and a second split half, said mold assembly comprising:a moving die which acts as said sliding mold in said primary shaping, and which includes said first split half having a recessed body and an upper and a lower annular peripheral portion projecting from respective upper and lower portions of said body;a movable frame which moves toward said moving die and away from said moving die, said movable frame having an integral movable member;a cavity plate disposed between said moving die and said movable frame and which moves in an axial direction, said cavity plate including said second split half having a recessed body and an upper and a lower annular peripheral portion projecting from respective upper and lower portions of said body;said moving die having a locating ring which communicates with a sprue formed in said moving die, said sprue which communicates with a plurality of cavities disposed in said moving die;a tubular member disposed within a central portion of said cavity plate and provided on an outer peripheral portion of said movable member for guiding said cavity plate;wherein said cavity plate is movable in one of a direction toward and away from said movable member;wherein said first split half includes a first upper and first lower distal end projecting portion which project in a direction normal to said respective upper and lower annular projecting portions, and said second split half includes a second upper and second lower distal end projecting portion each having a cutout, said respective second upper and lower distal end projecting portion projecting in a direction normal to said respective upper and lower annular projecting portions;wherein when said first split half and said second split half are brought into abutment with each other, said first and second upper and lower distal end projecting portions overlap each other along a length of each cutout of said first and second upper and lower distal end projecting portions, to form annular grooves at peripheral edges of abutting faces of said respective first and second split halves.