Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With coupling between charger and mold
Patent
1990-03-30
1991-07-30
Hoag, Willard
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With coupling between charger and mold
100219, 164341, 4254501, 4254519, B29C 4566
Patent
active
050356062
ABSTRACT:
A high tonnage reaction injection molding (RIM) press has fixed and movable platens for clamping a composite mold therebetween at a closed mold position. A plurality of high pressure hydraulic cylinders are mounted on a carrier for the movable platen, and a locking mechanism having a plurality of incrementally spaced locking positions is effective to lock the carrier selectively at said positions. A pair of low power hydraulic piston-cylinder assemblies connected with the carrier adjacent to its opposite ends move the carrier and movable platen to the closed position. Short stroke connecting rods operated by the high pressure cylinders are forced independently of each other into high tonnage engagement with the movable platen at a plurality of locations within the area of the composite mold to clamp the latter between the platens and positively seal its junctures, whereupon a RIM mix head injects the high pressure reactive chemicals into the sealed mold.
Sensor means including a pair of sensors associated with said pair of low power assemblies sense deviations of said opposite ends from a reference plane and cooperate with the associated low power assemblies to maintain the carrier at a predetermined attitude with respect to said plane as the carrier moves to said closed position. The sensor means also sense the distance that the carrier must be moved from the closed position to the next successive locking position, then in sequence, actuate said low pressure assemblies to move said carrier to said next successive locking position, thereby to provide space between said carrier and movable platen, actuate a spacer to span said space and prevent its closure during successive press operations, actuate said high pressure cylinders to clamp the mold between said platens, and finally actuate a RIM mix head to inject the high pressure reactive chemicals into said mold.
REFERENCES:
patent: 464392 (1891-12-01), Scheid
patent: 686607 (1901-11-01), Hamilton
patent: 821405 (1906-05-01), Ellis
patent: 866228 (1907-09-01), Schubert
patent: 1939960 (1933-12-01), During
patent: 2711561 (1985-06-01), Studli
patent: 2916768 (1959-12-01), Quere et al.
patent: 3095804 (1963-07-01), Lindner
patent: 3433290 (1969-03-01), Eggenberger et al.
patent: 3465387 (1969-09-01), Allard et al.
patent: 3587138 (1971-06-01), Bammert
patent: 3669549 (1972-06-01), Snider et al.
patent: 4247278 (1981-01-01), Descrovi et al.
patent: 4304540 (1981-12-01), Hammon
patent: 4318682 (1982-03-01), Larson et al.
patent: 4504208 (1985-03-01), Kurumaji et al.
Hoag Willard
The Dow Chemical Company
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