Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal...
Patent
1986-12-29
1989-03-28
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
249 74, 249 82, 249136, 249155, 264532, B29C 4930
Patent
active
048159603
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a blowing mould for blow moulding containers.
UNDERLYING PRIOR ART
Known blowing moulds of this kind (DE-PS 1 479 631) consist of a generally cylindric mould which is closed at one end and which is arranged to be closed at the other end by a multipart top. A substantial disadvantage of the known blowing mould is that only containers of a unitary size or length, respectively, can be made with this blowing mould.
DISCLOSURE OF THE INVENTION
It is the object of the present invention to provide a blowing mould which can be used for making containers of different dimensions, particularly of different lengths.
According to the invention this object is achieved in that the blowing mould comprises a terminal part guided in pressure sealed manner on the inside in the mould, and an adjusting device for axial adjustment of the terminal part.
Thus the blowing mould according to the invention comprises a terminal part arranged to be axially adjusted within the mould, by axial adjustment of which the mould is variable in its length by means of the adjusting device. Therefore containers of different lengths and thus containers of most different volumes can be made by means of the blowing mould according to the invention.
Advantageously the terminal part is provided with a projecting rim on the inside of the mould. This projecting rim can be of concave shape on the inside of the mould. Preferably the terminal part forms an outer wall the diameter of which is substantially equal to the inner diameter of the mould; then the projecting rim extends in continuation of the outer wall and the outer wall extends tangential to the curvature of the projecting rim of concave shape.
When the terminal part is formed in this way a seamless transition from the terminal part to the inner wall of the mould is effected by the projecting rim. This seamless transition is of particular advantage for the pressure sealed closure of the longitudinally adjustable mould. By the seamless transition between the terminal part and the inner wall of the mould furthermore causes a seamless transition between the bottom element and the other element of the container to be obtained when containers are blow moulded.
Advantageously, according to the invention, an adjusting device with at least one threaded spindle is provided in the blowing mould and engages the terminal part on the outside of the mould. When only one threaded spindle is used, preferably one end of this threaded spindle is fixed centrally on the outside of the terminal part and extends through a carrier of the mould. When a plurality of threaded spindles is used, preferably these spindles are arranged distributed symmetrically over the terminal part. Thereby tilting of the terminal part relative to the mould is avoided. Furthermore the adjusting device can have at least one adjustment nut which cooperates with the thread of the threaded spindle and which can be adjusted in a way known per se, e.g. manually or by motor, for adjustment of the terminal part and thus for adjusting the length of the mould.
Preferably the mould is fixedly anchored on the carrier whereby relative movements between the mould and the terminal parts are reliably avoided also in case of high interior pressures in the mould.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the blowing mould according to the invention is illustrated schematically and partly in section in the FIGURE and will now be explained and described in detail with reference to the numerals.
PREFERRED EMBODIMENT OF THE INVENTION
In the Figure the blowing mould is illustrated in its entirety and partly in longitudinal section. The blowing mould illustrated and described hereinbelow is of the same kind as the device for blow moulding which is described in DE-PS 1479631 mentioned in the beginning. The embodiment of the blowing mould described hereinbelow however is not restricted to this construction but can be used accordingly also in other known constructions of blowing mould devices.
The blowin
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patent: 3480994 (1969-12-01), Moslo
patent: 3570057 (1971-03-01), Doyle
patent: 3867084 (1975-02-01), Miller
Bushey C. Scott
Woo Jay H.
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