Plastic bottle equipped with a tamperproof device after its opening

Abstract

A plastic bottle equipped with a tamperproof device after its opening comprises a neck (1) and a cap (2) with corresponding screw threads (3, 4). The cap (2) is provided in its skirt (6) with at least one slide (22) and one pin (8) manually sliding into the slide (22). Below its screw threads (3) the cap (2) has a nut ring (9) that is provided with a plurality of holes (10); one of these is intended to receive and hold an arrow-tip end (18) of the pin (8) until its breakage in its weakened tract (17) when the cap (2) is unscrewed for opening. In addition, the pin (8) has an elongated projection (13) for its manual sliding inside the cutout (12) in a convex band (7) whose interior contains the slide (22) of the pin (8). The cutout has a lower end working as a stop for the pin (8).

Claims

1. Plastic bottle equipped with a tamper-proof device after its opening, comprising: a bottle neck in plastic, having a screw thread with a lowest thread and a circumferential projection, a cap, also in plastic, having: a corresponding screw thread, a skirt of the cap having a central symmetry axis, at least a slide in the skirt, a pin manually slidable in the slide along a sliding direction parallel to the central symmetry axis of the cap, the pin having a weakened section in the direction of its length, an arrowtip end, and an elongated projection for the manual sliding of the pin in the slide, and a cap retaining ring or ring nut, separable from the cap, positioned between the lowest thread of the screw thread of the bottle and the circumferential projection, in the bottle neck, wherein the cap retaining ring or ring nut is provided with a plurality of holes and wherein the pin is insertable in one of the plurality of holes intended to receive and retain the arrow-tip end of the pin, said one of the plurality of holes preventing the release of the pin except by breakage of the weakened tract of the pin during a rotation of the cap in an attempt of opening the bottle.

2. Bottle according to claim 1, characterized in that each hole of the plurality of holes of the ring nut has an inlet tapered downwards to retain the arrow-tip end.

3. Bottle according to claim 2, characterized in that the inlet has carvings to increase its flexibility during the insertion of the arrowtip end.

4. Bottle according to claim 1, characterized in that the slide of the pin is contained inside a convex band joined to the skirt of the cap and includes a pin retaining ring.

5. Bottle according to claim 4, wherein the convex band has a cutout for the elongated projection of the pin, the cutout having a lower end acting as a stop for the pin.

6. Bottle according to claim 5, wherein the pin has an enlarged tract which engages at resting position said pin retaining ring, before the manual sliding of the pin.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) Further features and advantages of the invention will result more evident by the description of embodiments of a plastic bottle equipped with a tamperproof device after its opening, illustrated, as an indicative and not limiting example, in the drawings here attached, where:

(2) FIG. 1 is a schematic perspective view of a portion of neck and screw cap of a first embodiment of a plastic bottle no more unsealed, where the tamperproof device in compliance with the invention is not activated;

(3) FIG. 2 is an enlarged partial schematic cross section of FIG. 1 according to a diametrical plan passing through the tamperproof device not activated;

(4) FIG. 3 is an enlarged partial schematic cross section of FIG. 1 according to a diametrical plan passing through the activated tamperproof device; and

(5) FIGS. 4 and 5 are cross sections, similar to FIGS. 2 and 3, of a second embodiment of a plastic bottle where a tamperproof device is different from that in FIG. 1.

DESCRIPTION OF EMBODIMENTS OF THE INVENTION

(6) Initially, reference is made to FIGS. 1 to 3 which are a schematic perspective view and relevant fragmentary enlarged radial cross-section views of a portion of neck and screw cap of a first embodiment of a plastic bottle in which a tamper-proof device according to the invention is not activated and activated, respectively. In these figures a bottle neck is indicated as 1 and a cap as 2. Conventionally, the bottle neck 1 and the cap 2 have correspondingly an external screw thread 3 and an internal screw thread 4, the one in proximity of the bottle mouth 5, the other on the facing skirt 6 of the cap. The cap 2, which is in plastic like the bottle, has, like the bottle, a symmetry axis y. The bottle is no more sealed, since the cap skirt 6 is no more attached at the bottom to a retaining ring by means of pins whose breakage during unscrewing the cap 2, permits the opening of the bottle. The retaining ring is positioned between the lowest thread, indicated as 100, of the external screw thread 3 of the bottle and a circumferential projection 101, traditionally present in the neck 1 of plastic bottles.

(7) According to the invention, rigidly connected to the cap 2 is at least one tamperproof device. Such a tamperproof device is housed in a convex band 7, joined to the skirt 6 to which it is tangentially linked. The convex band 7 has at the centre, in its concave part pointing towards the skirt 6, a cylindrical configuration that acts as a slide 22 for a pin 8 manually sliding along a direction y1 parallel to the central symmetry axis y of the cap 2 and, thence, of the bottle. One understands that the pin 8 behaves as a sliding bolt, since the traditional retaining ring above mentioned is made, in accordance with the invention, in the shape of ring nut 9 provided with a plurality of holes 10. The holes 10, that can be blind, as shown in FIGS. 2 and 3, but also through holes, have a hole axis y2 parallel to the sliding direction y1, so that the pin 8 can enter a hole 10 when a hole axis y2 coincides with the axis y1 of the pin.

(8) Tamperproof devices of the kind being described can be applied on the cap 6 in the number desired. The convex band 7 is applied to the cap 6 according to the jointing lines 11 by ultrasound sticking, for instance, fusion, or any other known method. The convex band 7 has a cutout 12 for the manual sliding of the pin 8 during use, by an elongated projection 13 in the shape of a button to be activated, for example, with the thumb finger. The elongated projection 13 can be knurled externally to facilitate grip. The stroke downwards of the pin 8, defined by the vertical extension of the cutout 12 is determined by the ring nut 9. The lower end of the cutout 12 which acts as a stop for the elongated projection 13 of the pin 8 is indicated as 14.

(9) In addition, the convex band 7 can have a retaining ring 15 in the form of an O-ring interacting with an enlarged tract 16 of the pin 8 to retain the pin during the assembly of the convex band 7 to the skirt 6 of the cap, as well as in a resting position, i.e. before activating the pin after the assembly of the tamperproof device.

(10) The pin 8 has a weakened tract 17 along its length and an arrow-tip or umbrella shaped end 18. The weakened tract 17 can be obtained by a simple cross-section reduction, preferably constant, as compared to the rest of the pin 8. As seen later on, the weakened tract 17 allows a preset breakage of the pin 8.

(11) Preferably, each hole 10 of the ring nut 9 is provided with an inlet 19 that is tapered downwards and intended to receive and retain the arrow-tip end 18 of the pin 8. In order to facilitate the insertion and retention of the arrow-tip end 18, the inlet 19 presents carvings 20 as shown in FIG. 2.

(12) During use, after the first opening of the bottle, by unscrewing the cap 2 and separating the same from the ring nut 9, the user can drink directly from the bottle or pour its content into a glass. If the user shall go away and leave the bottle carefree, once the bottle is reclosed, the user can move the pin 8 in its slide 22 inside the convex band 7 by operating with the thumb on the elongated projection 13 until inserting the arrow-tip end 18 of the pin 8 in a hole 10 of the ring nut 9. The tapered inlet 19 of the hole 10 prevents the pin 8 from sliding upwards, blocking by such manner the unscrewing of the cap 2 from the bottle neck 1. If a person different from the user wants to unscrew the cap anyway in order to open the bottle, he/she would break the pin 8 in its weakened tract 17 located between the skirt 6 of the cap 2 and the ring nut 9, as shown in FIG. 3. A similar breakage of the pin 8 may occur if that person manually pulled up the pin 8 to return it in its original resting position.

(13) Subsequently, the user becomes aware that the tampering occurred and, having evidence of it, the user would decide what to do with the bottle and its content.

(14) If the user wants to keep using it, another tamperproof device, provided on the cap 2, can be employed in the same way as above described.

(15) Now reference is made to FIGS. 4 and 5 that are cross-section views similar to those in FIGS. 2 and 3, of a second embodiment of a plastic bottle in which a tamperproof device differs from the one in FIG. 1 in the locking method of the arrow-tip end 18 of the pin 8. Same numbers are assigned to same parts or similar to those in the first embodiment. The same parts will not be described anew, either with regards to their structure, or to their operation. The cap 2 has a regular retaining ring indicated as 21. In FIG. 4 the skirt 6 of the cap 2 is already separated from the retaining ring 21, because of the occurred opening of the 10 bottle and breakage of its sealing that is provided by regular connecting pins (not shown) between the skirt 6 and the retaining ring 21 of the cap 2.

(16) In accordance with the second embodiment of the invention, through holes 102 are made in the circumferential projection 101 of the bottle neck 1.

(17) One of the through holes 102 is intended to receive and hold the arrow-tip end 18 of the pin 8. When the pin 8 is inserted in the through hole 102, the upward sliding of the pin 8 is made impossible. Therefore, the cap 2 cannot be unscrewed unless through the breakage of the weakened tract 17 of the pin 8.

(18) It should be understood that the present invention can find application also in other screw-capped food containers, like plastic or paper jars.

(19) It should be evident that both the pin 8 and its slide 22 and seat 7 can be made in a manner different from the one represented. The scope of protection of the invention is the one in the claims here attached.