Rapid-action mold closer

Details Rapid-action mold closer Rapid-action mold closer

1982-02-12

1984-04-17

Czaja, Donald E.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to close mold

91519, 4254512, 425DIG223, B29F 106

Patent

active

044431791

ABSTRACT:
An apparatus for closing a mold in an injection-molding operation has a double-acting main piston that is connected to a mold-carrying plate and that move axially in a main cylinder. A rapid-action piston extends into a small-diameter bore in the main piston, and the rear cylinder wall is formed with a large-diameter fill passage connected directly to a sump. A positioning cylinder is fixed on the main cylinder and contains a positioning piston axially fixed on the rapid-action piston and having in the positioning cylinder a rearwardly directed face larger than the face of the rapid-action piston and forming with the positioning cylinder a pressurizable positioning chamber. A passage extends axially through the rapid-action piston from its cylinder to the positioning chamber. A valve element is fixed axially to the rapid-action and positioning pistons and is displaceable between a rear closed position engaged with and blocking off the fill passage and an open position forward therefrom and exposing the fill passage. Valves connected between the reservoir, pressure source, and chambers serves in a rapid-action closing position to supply fluid under pressure to the positioning chamber while venting the front chamber to the reservoir and thereby moving the positioning piston, rapid-action piston, and valve element forwardly with displacement of the latter into the open position. In a mold-closing position, the valves supply fluid under pressure to the rear chamber while venting the front and positioning chambers for moving the valve element back into the closed position.

REFERENCES:
patent: 2190755 (1940-02-01), Dinzl
patent: 3084512 (1963-04-01), Huelskamp
patent: 3905742 (1975-09-01), McCarty

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