Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to lock mold in closed position
Patent
1990-12-10
1992-08-04
Hoag, Willard
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to lock mold in closed position
4254501, 425451, 4254517, 425589, B29C 4508, B29C 4504, B29C 4566
Patent
active
051353857
ABSTRACT:
A clamping system includes a fixed platen fixed to one end of a machine base and a plurality of clamping cylinders, the fixed platen holding a fixed mold therein, a movable platen fixed to the other end of the machine base and holding a movable mold therein, a plurality of tie bars extending through the movable platen and including pistons at their one ends, the pistons being slidably received within the clamping cylinders, and screw threads or grooves substantially at their longitudinal center, a unit disposed between the movable platen and the fixed platen and operable to move the movable platen to and from the fixed platen, two-part nuts mounted to the movable platen and meshingly engageable with the screw threads or grooves of the tie bars, and stoppers each of which is engaged with a recess provided on each of the tie bars mounted to the movable platen on the side opposite to the fixed platen characterized in that screws are threaded at end portions of the tie bars on the side of the fixed platen, screws engageable with the end portion screws on the tie bars are tapped on the inner circumference surface of the pistons so that the pistons may be rotatable through connecting means which is connected with a drive on the outer circumference surface of the pistons, and driving medium introducing chambers are provided so that the pistons may slide forward and backward.
REFERENCES:
patent: 3905741 (1975-09-01), Poncet
patent: 4315727 (1982-02-01), Black
patent: 4874309 (1989-10-01), Kushibe et al.
Fujimura Masaaki
Fukuzawa Shigeo
Kaneko Takahide
Hoag Willard
Ube Industries Ltd.
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