Note: Descriptions are shown in the official language in which they were submitted.
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This invention relates to a cap for closing a container
by screwing onto the container neck which is sealed by a tearable
lid.
The object of the invention is to provide a cap
wherewith the user, after rotating said cap, may easily grip part
of the lid and effect complete tearing-off thereof.
According to the invention there is provided a screw-
threaded cap for closing a container, said container having a neck
that is formed with a screw-thread for engagement by the screw-
thread on the cap, said neck being sealed by a tearable lid,wherein said cap has on an inner side thereof a helical blade,
which blade is adapted to enter into cutting engagement with the
lid as the cap is screwed down on the container neck, continued
rotation of the cap being effective to form a cut part in the lid,
said blade having a so-called "back end" which when considered in
relation to the direction of rotation of the blade is curved
inwardly relative to the blade to effect raising of the cut part
of the lid.
Preferably the closure cap has at the bottom thereof a
tearable ring which is adapted to bear on the container and
prevent untimely screwing of the cap to cause the blade to enter
and cut the lid.
Other details and advantages of the invention will stand
out from the following description, given by way of non-limitative
example and with reference to the accompanying drawings, in which:
Figure 1 is a section view of a closure cap clipped on a
container neck, and before tearing the safety strip away.
Figure 2 is a top view showing both the cut lid and the
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helical blade from the cap as shown in Figure 1.
The cap 1 as shown in the above figures, is provided
with a first so-called clip-on projection 2, intended to enclose
the outer projection 3 on the neck 4 from container 5.
To the top portion of the container neck 4, there is
sealed by a conduction-welding process, a lid 6 which has been
secured previously to screwing the cap 1 onto the container neck
4.
The neck 4 of the container 5 is provided with an outer
screw-thread 7 for cooperating with an inner screw-thread 8 inside
the cylindrical portion 9 of the cap 1.
On the other hand, the cylindrical portion 9 of cap 1
has a safety or tearable ring 10, provided with a tear strip 11.
As long as ring 10 has not been torn-off, the cap 1 can not be
driven into lid 6.
The essential feature of the closure cap according to
the invention is the presence on the inner surface of cap 1, of a
helical blade 12. The helical blade 12 has the feature that the
so-called "back" end 12' thereof is slightly curved inwardly
relative to the helix.
This means that as cap 1 is being screwed down on the
neck 4 of container 5 by a cooperation of screw-threads 7 and 8,
the helical blade 12 is driven into lid 6 and cuts therein a notch
of such shape that the user can grip the notch and tear the lid
completely off. This is made all the easier as the curved portion
12' from helical blade 12 raises the cut notch of the lid slightly
upwards. After unscrewing the cap, the user easily grips said
raised cut portion of the lid and can tear it completely off.
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It is indeed known that the lids which seal bottles or
containers are often cut with a knife and it is then very
difficult for the user to grip part of the lid to tear it
completely off, while by means of the cap according to the
invention provided with the helical blade, such tearing operation
is made much easier.
The screw-thread used is quite clearly a fast thread
which does not allow rotation of the cap by more than 360 during
the cutting operation, since otherwise the cut portion of the lid
would be completely cut-off, which is not the object of this
invention.
It must be understood that the invention is not limited
to the above embodiments and that many changes might be brought
thereto without departing from the scope of the invention as
defined by the appended claims.
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