Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With product ejector
Patent
1993-02-12
1993-10-19
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With product ejector
249 68, 264155, 264161, 264334, 425577, 425810, B29C 4538
Patent
active
052539970
ABSTRACT:
An injection molding machine employing a mold for molding, e.g., disk-shaped recording medium carriers. A mold-mounting plate has a front surface allowing the mold to be the mounted thereon. A gate-cutting punch is slidably inserted in a hole extending through the plate and opening in the front and rear surfaces of the plate. A bore extends longitudinally in the center of the punch, and an ejector pin is slidably inserted in the bore. A gate-cutting drive cylinder is mounted on the rear surface of the mold-mounting plate, and has a piston capable of abutting against the rear end of the gate-cutting punch. The piston is formed with a stepped bore having a large-diameter front portion and a small-diameter rear portion which are aligned on the same axial line. An ejector rod extends through the stepped bore, and has a large-diameter portion slidable within the large-diameter portion of the stepped bore, the front end of the ejector rod being capable of abutting against the rear end of the ejector pin. A sprue-ejecting drive cylinder is provided behind the gate-cutting drive cylinder on the same axial line, and has a piston rod connected to the rear end of the ejector rod. Thus, the machine includes no hydraulic cylinders incorporated in the mold, thereby eliminating various drawbacks conventionally encountered.
REFERENCES:
patent: 2613395 (1952-10-01), Massler
patent: 4085178 (1978-04-01), McNeely
patent: 4185955 (1980-01-01), Holmes et al.
Heitbrink Tim
Sumitomo Heavy Industrie's, Ltd.
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