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
Reexamination Certificate
1998-12-01
2001-01-09
Mackey, James P. (Department: 1722)
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
C100S295000, C425S451900
Reexamination Certificate
active
06171097
ABSTRACT:
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a device for injection moulding of plastics, with one stationary and one moveable die platen, and with a means for producing a closing force between the half-moulds carried by the die platens.
With such devices, if the closing force is transferred directly to the stationary die platen, in the case of moulds with small cross-wise dimensions this can result in the die platen bending over the edge of the mould. As will be explained in more detail with reference to
FIG. 1
, it has already been proposed to arrange a supporting means between the ends of the longitudinal spars and the rear side of the stationary die platen, which ensures that closing force is only introduced to the part of the rear side of the die platen which is opposite to the mould. In known proposals of this type (see DE 40 04 026, DE 25 29 504, EP 0 747 196), the supporting means is always formed by a second plate, parallel to the die platen and serving only for transferring force, which exerts pressure upon a spacer in the form of an optionally conical ring.
SUMMARY OF THE INVENTION
The invention proceeds from the consideration that although bending of the die platen itself is avoided by means of the known solutions, the problem of bending of the plate and spars is only spatially displaced. With respect to this, the invention proposes that the closing force is introduced exclusively to the supporting means, on areas of the supporting means adjacent to the longitudinal spars and spaced apart from one another, and that the ends of the spars are connected by tension bars.
REFERENCES:
patent: 5593711 (1997-01-01), Glaesener
patent: 5910328 (1999-06-01), Oshiro et al.
Engel, Maschinenbau Gesellshaft
Mackey James P.
Notaro $ Michalos PC
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