Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1986-04-24
1987-11-24
Tokar, Michael J.
Measuring and testing
With fluid pressure
Dimension, shape, or size
73 492, G01M 332
Patent
active
047080140
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a leak end defect testing device for containers, comprising a container sealing portion, a pressure exerting portion, and a pressure gauge.
When containers, especially plastic containers, are manufactured it is of great importance to be able to test the containers for leaks and defects before they are marketed.
A number of devices for this purpose are known. Most of them are intended for sequential testing each container being closed in a suitable manner and exposed to pressure, a differential pressure between the inside and outside of the container then being measured. If changes appear in said differential pressure the container is ejected. Examples of devices produced according to this principle are e.g. disclosed in GB-PS No. 1 123 997 and DE-AS No. 23 45 731.
In DE-OS No. 32 46 095, furthermore, a device for testing the sealing surfaces of a number of containers is disclosed.
All these known devices, however, have in common a relatively complicated structure comprising control means for ejecting discarded articles and for supplying new containers. The containers to be tested are preferably bottles made from plastic or glass. The known devices are also bulky.
There is, thus, a demand for a simple and easily handled device for testing containers, especially plastic bottles. It is especially desirable to be able to test such containers as to leakages and defects in one single step.
SUMMARY OF THE INVENTION
The present invention, thus, has the object to provide a device which satisfies said demands and by the aid of which containers may be tested in one step as to leakages and as to the shape of the container opening. Also, it would be advantageous if the container could simultaneously be tested as to any possible moulding defects, especially in the area of the container opening.
The testing device should be simple, non-expensive and reliable and it should, if desired, also be possible to use it for controlling other operations.
These objects are achieved with a device of the kind mentioned above which is characterized by the features appearing from the claims.
The device according to the invention has a very compact and simple structure and it may easily be used as a manual apparatus or as a device incorporated in the manufacturing step, said device easily being installable in existing conveying facilities in a container manufacturing plant, e.g. a plant having a production capacity of 2000 one-liter containers/hour. Said device can of course be installed in smaller plants as well as in plants having much greater capacity.
It will be appreciated that the device according to the invention as well as being used for testing containers that should be leak-proof can also be used for all kinds of limited volumes having any kind of opening or the like.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to an embodiment shown in the accompanying drawing, where
FIG. 1 shows a device according to the invention arranged above a plastic bottle to be tested,
FIG. 2 shows the device according to the invention in a testing position on the bottle, this figure showing a leakproof bottle,
FIG. 3 shows the device in a testing position in a case of a leaking bottle, and
FIG. 4 shows the device according to the invention in a testing position on a bottle that has a moulding defect in the neck area.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the figures the present invention is shown as utilized for testing a recently moulded plastic bottle. Said bottle is designated 1. It should be mentioned in this connection that it is possible to test containers or "closed volumes" of quite different kinds, an adaption of the contact surfaces between the device and the container opening being the only necessary measure. The remaining functions of the device according to the invention will remain the same. It is also possible to test containers made from different kinds of materials, i.e. the invention is not limited to t
REFERENCES:
patent: 3771649 (1973-11-01), Strauss
patent: 3805593 (1974-04-01), Sandoz et al.
patent: 3805594 (1974-04-01), Hayashi
patent: 4144742 (1979-03-01), Schmidt et al.
patent: 4278178 (1981-07-01), Pemberton et al.
501 A/s Moss Glasveark
Lynn John H.
Tokar Michael J.
Williams Hezron E.
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