Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1987-03-05
1988-07-05
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
2643289, 26432815, 425564, 425566, B29C 4520, B29C 4572
Patent
active
047551313
ABSTRACT:
This invention relates to a valve gated single cavity injection molding system wherein the valve pin actuating mechanism is cooled by circulating hydraulic fluid through it. The cylinder is mounted in a cylinder housing inside a dome portion of a heated manifold housing. The cylinder housing has a wing portion extending out openings in each side of the manifold housing. Each wing portion has an inlet duct and an outlet duct for hydraulic fluid across which a pressure differential is applied. The ducts connect to circumferential channels which extend around the outside of the cylinder and lead to respective openings into the cylinder. Thus, the application of hydraulic fluid pressure during operation circulates hydraulic fluid through the actuating mechanism. The cooling which results extends the operating life of the mechanism, particularly the seals and O-rings.
REFERENCES:
patent: 3037245 (1962-06-01), Darnell
patent: 4026518 (1977-05-01), Gellert
patent: 4222733 (1980-09-01), Gellert et al.
patent: 4286941 (1981-09-01), Gellert
patent: 4378963 (1983-04-01), Schouenberg
patent: 4380426 (1983-04-01), Wiles
patent: 4446360 (1984-05-01), Gellert
patent: 4468191 (1984-08-01), Gellert
patent: 4663811 (1987-05-01), Gellert
Mold-Masters Manuel "Hydraulic Valve Gating Manuel", Apr. 1984, pp. 10-12.
Heitbrink Timothy W.
Mold-Masters Limited
Woo Jay H.
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