A capping capsule with a thin wall comprising a tearable guarantee strip connected to the skirt of said capsule by means of two rupture lines of reduced thickness. The tearable guarantee strip is provided with vertical ribs spaced from each other, the thickness of which rapidly decreases to reach zero at the edges of said strip defining the crimping lines.

The present invention relates to improvements in capping capsules and more 
particularly, although not exclusively, of the type described in the 
applicant's French Pat. No. 76 06230, granted Aug. 13, 1979 on an 
application filed Feb. 27, 1976. 
Devices of the above mentioned type are particularly appreciated when 
provided with a tearable strip enabling their opening without the use of 
an instrument such as a knife. The setting of such a tearable strip 
creates necessarily a fragile zone due to the fact that said strip is 
connected to the skirt of the capsule by rupture lines of reduced 
thickness which have a low resistance to damage. Rupture of the capsule 
often occurs around these lines when it is positioned by setting over the 
neck of a bottle and more particularly if this setting is carried out by 
exerting considerable effort on the bottom of the capsule. 
The improvements of the present invention aim to remedy these drawbacks in 
order to obtain a tearable strip: 
does not collapse during the positioning of the capsule and avoids the 
rupture of the tear lines which define it; 
prevents a faulty tear-off of the guarantee strip, that is to say which 
avoids a tear that would not follow the crimping lines; 
increases the grip on the tearable strip when the user takes hold of it. 
According to the invention, the strip of the capping capsule is provided 
with spaced vertical ribs, the thickness of which decreases rapidly to 
reach zero at both edges that define the rupture lines of said strip. 
The attached drawing given by way of example will enable a better 
understanding of the invention, of its characteristics and advantages:

FIG. 1 shows a capping capsule 1 which is intended to be placed on the neck 
of a bottle in order to cover it, to constitute a guarantee element for 
its contents, and/or to decorate it. The capsule which is illustrated is 
similar to the one which is the subject of the aforesaid French patent, 
but the invention may of course be applied to any capsule provided with a 
tearable strip. 
The capsule illustrated in FIG. 1 comprises a tubular body or skirt 2 which 
is closed at one of its ends by a bottom part 3 whose junction to the 
skirt is provided with holes 4 intended to permit air to escape during the 
positioning of the capsule. A rib 5 is provided inside the skirt 2 to 
enable the capsule 1 to be fixed on the bottle neck by a snap action of 
the rib under the ring of the neck. 
A tearable guarantee strip 6 is provided in the skirt between the rib 5 and 
the bottom part 3. As more particularly illustrated in FIG. 2, the strip 6 
being connected to the skirt by means of two peripheral grooves situated 
in the thickness of the skirt on the inside thereof. These grooves define 
crimping lines 7, 8 and have a triangular shaped cross-section so that the 
guarantee strip is actually connected to the skirt by only two thin edges, 
one of them 6a being integral with the strip 6 and the other one 2a being 
integral with the skirt 2. 
When such a capsule has to be positioned on the neck of a bottle by axial 
action on its bottom part 3, it is easily understandable that the pressure 
causes the collapse of the strip 6 and usually the breaking of the 
crimping lines 7, 8 at the edges 2a, 6a. 
According to the invention, the innerside of the tearable strip is provided 
with vertical ribs 9 spaced from each other and whose thickness aims at 
increasing the moment of inertia of the cross-section of the strip 6 in 
order to avoid the distortion of said strip by positioning of the capsule 
when an axial strain is applied on the bottom part 3. The thickness of the 
ribs 9 depends upon the thickness of the strip and upon the effort to be 
applied on the bottom part 3 of the capsule to position its skirt 
correctly surrounding the neck 10 of a bottle (FIG. 3). The thickness of 
each rib decreases rapidly to reach zero at the edges 2a, 6a. 
In order to provide in a zone of the strip 6 an end 6b which will be easily 
accessible by the user and in order to enable the tearing-off of said 
strip, there is provided, after moulding of the capsule, a cut-out or 
stamped portion 11 made by means of a tool shaped as a gouge cutting right 
through the strip (FIG. 1). This gouge is preferably disposed obliquely 
with respect to the periphery of said strip, that is to say orientated in 
a non-normal way with regard to this periphery. 
In order to tear off the strip 6, the user introduces his nail or any 
instrument under the portion 11 so as to raise the end 6b of the strip 
which then constitutes a gripping element. Since its inner face is 
provided with ribs 9, the grip of the fingers to this gripping element is 
improved and therefore the tearing-off of the strip is made easier. 
In the case of a usual tearable guarantee strip, a faulty tear-off movement 
often occurs at the rupture lines. In other words, it sometimes happens 
that tearing action moves away from a rupture line and across the strip 
itself which is thus cut off. It therefore becomes impossible to tear off 
completely the guarantee strip. On the contrary, according to the present 
invention, if a tear-off starts within the height of the guarantee strip, 
for instance following the line 12, illustrated by dotted lines in FIG. 4, 
such a tear will end against the base of the following rib 9 so that, upon 
further tearing-off effort, the tearing of the strip occurs along the base 
of the rib in a direction of the crimping line 7,8. In that way, the 
tearing-off is corrected each time an undesirable tear starts diverging 
from the provided tear-off zone. 
It must of course be understood that the above description has only been 
given by way of example and that it in no way limits the field of the 
invention which would not be departed from by replacing some details 
described herein by any other equivalents.