Plastic and nonmetallic article shaping or treating: processes – Miscellaneous
Patent
1980-02-25
1982-01-26
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Miscellaneous
264334, B29F 106
Patent
active
043128289
ABSTRACT:
An injection molding machine having a dual tonnage traversing cylinder whereby extended stroke mold breakaway force may be exerted by the traversing cylinder unit before it begins its higher speed traversing movement to completely open the mold. The traversing cylinder comprises a normal length piston received within the cylinder barrel and bolted at one end to the moveable platen. The effective working area of the pressure face for this piston during the retraction stroke is such that low force, high speed retraction of the mold section connected to the moveable platen may be achieved. Also disposed within the barrel is a breakaway piston, which may be annular in shape and disposed concentrically with respect to the fast traverse piston and positioned such that it will abut an annular shoulder on the fast traverse piston throughout the retraction stroke of the breakaway piston. The effective working area of the pressure face for the breakaway piston is considerably larger than that of the fast transverse piston so that much greater breakaway force can be exerted on the moveable platen during the early stage of mold separation after the initial, short distance breakaway force is exerted by the main cylinders.
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Flickinger William T.
Staiger Donald W.
Hoffman John F.
HPM Corporation
Jeffers Albert L.
Pavelko Thomas P.
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