Plastic article or earthenware shaping or treating: apparatus – Mold opening and closing means and segmented female mold – Varying pressure and/or speed closing
Patent
1979-08-21
1980-10-28
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
425150, 425590, 425595, B29C 116, B29F 100
Patent
active
042304423
ABSTRACT:
A thrust member on column secured to a movable platen of an injection-molding machine, surrounded by a mounting frame with laterally withdrawable shutters which enter behind the thrust member in the terminal phase of a mold-closing stroke for transmitting to the thrust member a supplemental clamping force, is linked with a hydraulically actuated plunger or driving piston via a lost-motion coupling. The clamping force is supplied through one or more annular pistons received in respective cylinder chambers of a stationary housing linked via tie rods with a fixed platen. Upon the release of the clamping force, a counter-vailing hydraulic force is developed between the column and the driving piston, whose forward displacement is limited by a fixed abutment, to break open the mold with a larger hydraulic force. The annular clamping pistons remain spaced from the adjoining housing walls in their retracted positions to allow for an extra rearward shift if, through a malfunction, the shutters are trapped between their mounting frame and the column.
REFERENCES:
patent: 3156014 (1964-11-01), Wenger
patent: 3263277 (1966-08-01), Ohlendorf et al.
patent: 3270372 (1966-09-01), Hesse
patent: 4017236 (1977-04-01), Perkman et al.
Rees Herbert
Robinson Allan H.
Flint, Jr. J. Howard
Husky Injection Molding Systems Limited
Ross Karl F.
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