Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1986-10-20
1987-10-06
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
2643288, 26432815, 425562, 425563, 425564, 425566, 425588, B29C 4520, B29C 4522
Patent
active
046980130
ABSTRACT:
This invention relates to hydraulic actuating mechanism for a valve gated injection molding system wherein the enlarged head of the valve pin is removably connected to the piston and a floating seal is provided against the leakage of hydraulic fluid. The actuating mechanism has a piston which is reciprocated in a cylinder between open and closed positions. The valve pin extends through a bore in the piston and has an enlarged head which is retained in a cup in the piston by a circular cap which fits over it. The cap is held in position between a removable resilient retaining ring which snaps into a groove and a compressible O-ring. Thus, both a seal against leakage and an easily releasable connection between the valve pin and the piston are provided by the combination of the resilient retaining ring and the O-ring.
REFERENCES:
patent: 4213751 (1980-07-01), Fernandez
patent: 4446360 (1984-05-01), Gellert
patent: 4468191 (1984-08-01), Gellert
patent: 4609138 (1986-09-01), Harrison
Heitbrink Timothy W.
Woo Jay H.
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