Plastic article or earthenware shaping or treating: apparatus – Mold opening and closing means and segmented female mold – Varying pressure and/or speed closing
Patent
1978-12-05
1981-01-06
Flint, Jr., J. Howard
Plastic article or earthenware shaping or treating: apparatus
Mold opening and closing means and segmented female mold
Varying pressure and/or speed closing
4254517, 4254501, 4254519, 425590, 425589, B29F 100
Patent
active
042433690
ABSTRACT:
Mould closing, clamping and opening means for the split mould of a pressure moulding machine comprises a pair of elongated arms each pivotally attached to the moving platen of the machine at one end and free at the other end, and extending lengthwise between the moving platen and a hydraulic rear clamping platen. During a mould operation the free ends of the arms engage the rear clamping platen so as to act as struts between the rear clamping platen and the moving platen during a mould clamping operation, but during a mould opening operation the arms are swung by an hydraulic cylinder to a position in which they register with openings in the rear clamping platen so that the arms may pass rearwardly through the openings as the mould opens.
REFERENCES:
patent: 2335807 (1943-11-01), Smith
patent: 3208373 (1965-09-01), Bachelier
patent: 3768953 (1973-10-01), Dangremond et al.
Flint, Jr. J. Howard
Micro & Precision Mouldings (Cheltenham Limited)
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