Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to close mold
Patent
1996-08-19
1998-09-22
Ryan, Patrick
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to close mold
100231, 100258A, 4254501, 4254519, B29C 4564
Patent
active
058111417
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is the U.S. national phase of PCT application PCT/EP95/04989 filed 16 Dec. 1995 with a claim to the priorities of German patent applications P 44 45 448.1 filed 20 Dec. 1994, P 44 45 450.3 filed 20 Dec. 1994, and 295 15 748.8 filed 4 Oct. 1995.
FIELD OF THE INVENTION
The invention relates to a mold-closing apparatus for a plastic-molding machine of the type having a machine frame, two fixed plates which are supported on the frame and spaced apart parallel to each other, at least one movable mold-holding plate which is movable between the fixed plates on the frame, at least one closing drive which is mounted on one of the fixed plates and which can act on the movable mold-holding plate with a closing force effective along a force axis toward the other fixed plate, and a plurality of tension members which connect the two fixed plates with each other and which withstand the reaction forces created by the closing drive on the two fixed plates. In this arrangement the tension members normally include two upper tension members whose attachment points lie on the fixed plates above a horizontal plane including the force axis and two lower tension members whose attachments points-on the fixed plates lie below this horizontal plane.
The invention is preferable usable in an injection-molding machine whereby in this case only one movable mold-holding plate is provided and one of the two mold-holding plates is constituted as a stationary mold-holding plate. The other fixed plate is the support plate of the closing drive. The invention is however movable mold-holding plates which are movable toward each other by two drive units. Both fixed plates are then support plates of the two closing drives. This type is particularly applicable to blow-molding machines.
The force applied by the closing drive to close the mold is effective on the two fixed plates against a reaction force driving them apart it being understood that plastic injected into the closed mold must be withstood by the fixed plates as a force driving the mold halves apart. The two fixed plates must therefore be connected together by adequately dimensioned tension elements which prevent outward movement of the stationary plates and an opening of the mold by the injection pressure.
In injection-molding machines of standard construction the tension members are formed as four straight rods or columns which interconnect the two fixed plates, i.e. as a rule the stationary mold-holding plate and the support plate carrying the closing cylinder and are secured in the corner regions of these plates. In this manner one has sufficient mutual support of the fixed plates with uniform distribution of force over the surfaces of these plates that can prevent opening of the mold by the injection pressure even when as a result of the formation of the injection mold the injection pressure is effective asymmetrically to the central axis of the mold. The use of straight rods or columns as tension members has however the disadvantage that in particular the two rods remote from the frame impede free access to the space between the stationary plates. This is particularly inconvenient for use with a manually loaded device since access must be had to the space between the open mold parts in order to remove the finished molded article.
The above-used term "fixed plate" means that in use the plates are substantially stationary and do not participate in the opening and closing movements of the mold tools. As a rule however at least one of these stationary plates and sometimes even both are limitedly shiftable on the machine frame so that they can be shifted longitudinally of the machine by the closing force to compensate for length changes of the tension members.
In order to avoid impeding access to the space between the mold halves so-called rodless injection-molding machines have been proposed. These have instead of the straight rods or columns on each side of the machine a C-shaped tension member which interconnects the two f
REFERENCES:
patent: 4460326 (1984-07-01), Croseck
patent: 4861259 (1989-08-01), Takada
patent: 5135385 (1992-08-01), Fukuzawa et al.
patent: 5249951 (1993-10-01), Leonhartsberger et al.
patent: 5536166 (1996-07-01), Schad
patent: 5578329 (1996-11-01), Hohl
Pickel Herbert
Wohlrab Walter
Dubno Herbert
Krauss-Maffei AG
Ryan Patrick
Schwartz Ivrie A.
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