Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – For extrusion or injection type shaping means
Patent
1983-05-09
1984-11-27
Czaja, Donald
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
For extrusion or injection type shaping means
4254519, B28B 700
Patent
active
044848803
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a clamping device for clamping the form tools of an injection molding machine to form supports, comprising at least two and preferably four clamping bolts on the rear side of each form tool, which are perpendicular to the form parting plane and protrude into holes in the form support, and locking means for the form tools.
In general, when fastening form tools to form supports, the holding means for the respective tool part are arranged in the form space between the supports. As a result damage caused by the form easily occured and, further, access to the form parts between the tension rods was difficult. Another problem was caused by the fact that without excessive expenses they could hardly be made sufficiently stable to absorb high tool opening forces.
The DE-OS No. 27 24 020 suggests to provide a clamping device for clamping the form parts of an injection molding machine to the form supports in which each form part has guide bolts at its rear side which are perpendicularly aligned to the form parting plane, protrude through bores in the form support and project beyond the rear side of the form support. On the rear side of the tool support transverse slide means are arranged which engage in lateral openings in the guide bolts and press the form part against the form support by means of a wedge surface.
It was the object of this document to arrange the clamping means, i.e. the transverse slide means, no longer in the form space between the supports and to protect them, thus, from being damaged. This construction has proved unsuitable for use in practice because the length of the guide bolts, which must be longer than the width of the form supports, would require excessive opening distances in order to be able at all to exchange the form tools. Another disadvantage would result from the use of the guide bolts as fastening means. This would require that the guide bolts and the corresponding bores in the tool supports be extremely precise, so that the form tools are properly centered--a problem which grows naturally the harder the more guide bolts are necessary for fastening a form tool to the form support.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a clamping device of the above-mentioned kind which has, on the one side, the advantage that the form space between the form supports is free from the clamping means for the form tools and that, on the other side, the form opening distances can be small, i.e. like fastening by means of fastening members at the front of the form supports, and in which the centering of the tools is effected independently from the clamping elements.
This is achieved according to the invention by openings extending at the sides of the form support which run into the holes for the clamping bolts and in which the locking means engaging at the clamping bolts within the form support are arranged, a guide bolt known per se or the like for positioning the form tools in the closing plane being provided.
The extremely short clamping bolts do not interfere with the guiding and centering of the form tools. With the clamping device according to the invention the centering of the form tools can be effected from form tool to form tool as well as from form tool to form support.
When centering as first mentioned, one guide bolt of one form tool projects, for example, into a guide bore of the other form tool. This centering is constructionally simple and very precise as no indirect way, by using parts of the machine, is chosen. When centering form tool to form support, in the center of the rear side of the form tool a centering member having the shape of a truncated cone can, for example, be provided, which extends in the mounted position into a corresponding opening or recess in the form suppert.
In both cases the actual fastening of the form tools to the form supports is effected independently of the centering of the form tools.
An embodiment of the invention provides that the locking means have wedge-sha
REFERENCES:
patent: 2649621 (1953-08-01), Moslo
patent: 3456297 (1969-07-01), Andreasson
patent: 3818801 (1974-06-01), Kime
patent: 4116599 (1978-09-01), Ruegg
patent: 4348165 (1982-09-01), Vostrovsky
Czaja Donald
Fischbach V.
Ludwig Engel KG
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