Plastic article or earthenware shaping or treating: apparatus – Mold opening and closing means and segmented female mold – Varying pressure and/or speed closing
Patent
1974-06-26
1976-03-02
Shore, Ronald J.
Plastic article or earthenware shaping or treating: apparatus
Mold opening and closing means and segmented female mold
Varying pressure and/or speed closing
91411R, 92152, 425DIG223, B29F 106
Patent
active
039415490
ABSTRACT:
A reciprocating screw injection molding machine characterized in that the screw is actuated by coaxial hydraulic rotary and linear motors, and in that a movable mold supporting platen has a clamping piston thereon which is reciprocable in a clamping cylinder, the latter having mounted thereon platen and valve actuating cylinders which are operatively secured to the clamping piston and to a valve member respectively to effect movement of the clamping piston and movable mold supporting platen toward and away from a fixed mold supporting platen and to open the valve member for flow of oil from a prefill tank into the clamping cylinder chamber and vice versa, said valve actuating cylinder further being operative upon closing of the mold to close the valve and to admit fluid under pressure into the clamping cylinder chamber to pressurize the trapped fluid therein to lock the clamping piston and movable mold supporting platen in mold closing position with required tonnage for injection of plasticized material into the mold cavity by operation of the injection assembly.
REFERENCES:
patent: 3084512 (1963-04-01), Huelskamp
patent: 3401713 (1968-09-01), Ohlmsted
patent: 3603210 (1971-09-01), Florjancic
patent: 3677685 (1972-07-01), Aoki
patent: 3781160 (1973-12-01), Mankowsky
Safran David S.
Shore Ronald J.
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