Bottles and jars – Closures – Frangible member or portion
Patent
1983-12-13
1985-10-15
Pollard, Steven M.
Bottles and jars
Closures
Frangible member or portion
215253, 215317, B65D 4134
Patent
active
045468923
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a plastic sealing screw cap with an improved tamper-proof strip. It is related to the technical field of packaging elements.
BACKGROUND OF THE INVENTION
Numerous sealing screw devices having a safety means intended to control access to the contents are known of the container closed by these devices, and to prevent, in particular, fraudulent handling of these contents.
Generally, these sealing devices which are fitted on bottles whose rings are of the almost universally standardized type known under the name "Pilferproof" have a screw cap, possibly provided with a seal, and an annular safety strip that can be separated at the lower part from the skirt of the cap. Any attempt to unscrew the cap must cause the separation of the safety strip.
Originally, these tamper-proof caps were made of metal, particularly aluminum and, after screwing on the cap, the safety strip was crimped on the neck by a simple mechanical device.
At the present time, there is a tendency to replace aluminum with thermoplastic polymers which are no longer suited to a simple crimping because of their natural elasticity,
Therefore, a certain number of solutions have been devised to provide a crimping of the tamper-proof strip.
In French Pat. Nos. 2,282,378 and 2,467,790, heat-shrinking of the tamper-proof strip under the action of the jet of hot air is performed.
This solution involves adding an additional stage to the bottling and capping lines, and exhibits the risk of total melting of the seals when the line stops, which necessitates providing a safety device. Further, the appearance of the shrunken strip often leaves something to be desired.
In French Pat. No. 2,349,140, the tamper-proof strip is folded toward the inside of the cap when it is screwed on the neck of a bottle, so that its upper edge strikes against a projection of the neck. During unscrewing, the strip thus locked cannot rise and is separated from the skirt. But there is a danger that the strip will be pulled out without separating.
SUMMARY OF THE INVENTION
This invention constitutes another solution of this problem, a solution which provides both an easy fitting of the cap and a clean and reliable separation of the tamper-proof strip during the first unscrewing.
Particular means for sealing the cap are proposed.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 to 4 represent in section (FIGS. 1 and 2) or in partial section (FIGS. 3 and 4) the cap, the object of the invention. FIG. 3 also represents a first means for sealing the cap of the invention.
FIGS. 5 and 6 represent, in axial half-section, a second sealing means.
FIG. 7 represents, in axial half-section, a third sealing means.
DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS
The sealing screw cap of the invention has (FIG. 1) a head (1) and a skirt (2) provided with an inner threading (3) which works with the threading of the container to be sealed. At the lower part of the skirt (2) the tamper-proof strip (4) is fastened by a multiplicity of bridges (5) which constitute the breaking points during subsequent unscrewing. The tamper-proof strip (4) has a continuous annular upper part (4A) and a lower part consisting of a multiplicity of tabs such as (6) connected to the upper part (4A) by a thinner part (7) which constitutes a sort of hinge. The tabs (6) comprise a heel (8) and a thinner extension (9).
The tabs (6) are molded in the position of FIG. 1, i.e., turned upward. During removal from the mold, they turn and come into the vertical position as in FIG. 2. Once removal from the mold is completed, their own elasticity brings them into the position of FIG. 1, after pivoting around the thinner area (7) which acts as a hinge. Thus they form an acute angle with the annular part (4) and are turned toward the inside of the cap.
During the screwing of the cap over the glass ring (10) (FIGS. 3 and 4), the tabs (6) are forced by the counter-ring (11) of the neck to fold against the strip (4) and, at the end of screwing, the heels (8) go beyond the edge (12
REFERENCES:
patent: 3072277 (1963-01-01), Hoffmann
patent: 4196818 (1980-04-01), Brownbill
patent: 4322012 (1982-03-01), Conti
Cebal
Pollard Steven M.
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