FR2676997A1 - Child-proof service stopper - Google Patents

Abstract

The invention relates to a child-proof service stopper intended to be mounted on the neck (C) of a container and comprising: - an internal cap (2); - an external hollow cap (3) mounted on the outside of and around the internal cap (2). The external cap (3) can be located, with respect to the internal cap (2), in two extreme relative positions, namely a withdrawn closed position and a protruding open position such that in the closed position the free end section (16) of the duct (8) closes the discharge hole (13) and that in the open position the free end section (16) of the duct (8) leaves the discharge hole (13) free and such that the change from the closed position to the open position involves at least the application of external stresses capable of making the external skirt (11) oval and at least one other operation.

Description

CHILD-PROOF CAP
The invention relates to a child-resistant stopper.

Child-resistant protective closures are already known. Reference may be made, for example, to the following documents: US-A-3,974,929, US-A-4,134,513,
US-A-4 165 813, US-A-4 555 036, US-A-4 729 487,
CH-A-594 535, DE-A-2 638 414, DE-A-3 001 512,
DE-A-3 119 248, GB-A-1 522 019, GB-A-1 535 051,
GB-A-2 030 970, GB-A-2 192 385, EP-A-0 257 481,
FR-A-2 339 539, FR-A-2 414 005, FR-A-2 430 368,
FR-A-2 532 625, FR-A-2 560 158, FR-A-2 571 695,
FR-A-2 589 828 and FR-A-2 616 757.

According to documents US-A-4,203,532, US-A-4,807,768,
CH-A-663 396, GB-A-2 158 048, FR-A-2 350 272, the closure is of the hinged type, the shutter part remaining permanently attached to the base part.

 According to document US-A-4 832 218, a screw type cap is arranged to be able to operate in "childproof" mode or in normal mode.

According to documents FR-A-2 617 465 and
FR-A-2 618 759 it is proposed to combine a neck container, a pouring spout and a screw shutter which is removed to gain access to the pouring spout. The set is childproof.

 According to document US-A-4 257 561, a child-resistant spray cap is described. To be able to operate the vaporizer, you must press an external button and turn the vaporizer head, which therefore remains permanently attached to the base.

 Service plugs are also known, for example of the push -pull type or with a pivoting orifice allowing the distribution and possibly the metering of the contents of the bottle (or equivalent) with which such a service plug is associated. Such service stoppers are well suited for the distribution and dosing of flammable liquid materials, or toxic or corrosive materials.

However, the problem of child safety of this type of cap then arose.

Finally, tear-off tamper evident rings for caps are known (see for example the document
FR-A-2 449 611).

 The subject of the invention is a child-resistant stopper which can be mounted on a bottle or a bottle which can be deformed by hand pressure, containing such a flammable, toxic, corrosive, more generally dangerous content.

 More particularly, the invention relates to the case where the opening (and therefore vice versa closing) operation of the plug is carried out in the axis of the neck, by sliding, rotation.

 Such a service stopper has the characteristics expected for this kind of closure, especially for the application envisaged for dangerous contents (such as sealing).

 According to a variant, the child-resistant service plug is tamper-proof.

To this end, the child-resistant service plug according to the invention comprises
- an internal cap having
- a hollow and enlarged base for fixing to the
collar
- a fireplace adjoining and narrower than
the base and extending it axially
having
-a closed free end part
opposite the base; and
-at least one passage opening
contents of container removed from
the free end of the chimney;
-a hollow external cap mounted on the outside and
around the inner cap having
- an internal skirt and an external skirt
concentric radically spread apart and in
look at each other and directed to
the opposite of the fireplace;
- an adjoining end piece extending axially
the two skirts placed around the fireplace
towards its free end part - at least one hole for discharging the contents of the
container located at the free end of
the tip of size and shape
complementary to the free end
from the chimney - at least one continuous passage for the contents
of the container from the opening of
passage to the discharge hole, delimited by the
chimney, the internal skirt and the end piece - deformability of the external skirt in
transverse radial direction under the action
external diametric constraints,
centripetal and suitable applied towards
its free edge, causing ovalization
skirt - projections adjoining the
outer skirt towards its free edge and its face
internal and facing the internal cap and
likely and in the absence of
external constraints to interfere with
with each other to block certain
relative movements of the outer cap
relative to the inner cap and to be
released from each other by a
suitable external stress causing
Ovalization of the outer skirt; and - complementary organs respectively of
the internal skirt on its internal face and
internal cap adapted to allow, by their
cooperation, at least axial sliding
relative of the outer cap with respect to
internal cap.

 The external cap can be, with respect to the internal cap, in two extreme relative positions, namely a retracted closing position and a projecting opening position so that in the closed position the extreme free part of the chimney closes the discharge, that in the open position the extreme free part of the chimney leaves the discharge hole free, and that the passage from the closed position to the open position implies at least the application of external stresses capable of ovalizing the outer skirt and at least one other operation.

According to other characteristics
- Protrusions adjoining the end piece or the
internal skirt cooperate with the chimney for
participate in the axial guidance of the cap
outer on the inner cap.

- The internal cap is in one or more
parts.

- The tip has a generally conical shape or
frustoconical whose apex is towards its
extreme free part.

- The internal cap includes walls
profiles delimiting and forming the passage to
except the hole and the opening.

- Protrusions of the internal skirt and
internal cap have the function of ensuring
by their cooperation a blockage to
axial sliding.

The protrusions of the outer skirt and the
internal cap are located at
opposite locations corresponding to the
sliding angular relative position
possible axial of the external cap by
compared to the internal cap.

Complementary organs of the skirt
internal and internal cap are at least
a pair of complementary lugs and grooves
and able to cooperate with each other having
some angular localization
corresponding to the relative position
possible axial sliding angle of the
outer cap relative to the cap
internal.

- The cap includes on the external faces
visible from the outer skirt and the hood
internal markings of the
sliding angular relative position
possible axial of the external cap by
compared to the internal cap.

- The protrusions of the outer skirt and the
internal cap have the function of ensuring
by their cooperation a pivoting blocking
on a certain run.

- Complementary organs of the skirt
internal and internal cap are of the type
no screws.

- The cap also includes a ring
tamper evident with tear-off tab.

The other characteristics and advantages of the invention will emerge from the description which follows with reference to the accompanying drawings in which
- Figures 1A and 1B are two half-views in axial section of a first variant of child-resistant service plug according to the invention, this variant being of the "orient, press, pull" type.

 - Figures 2 and 3 are two cross-sectional views along lines II-II and III-III of Figures 1A and 1B, partial, respectively of the single inner cap and the single outer cap.

 - Figures 4A and 4B are two half-views in axial section of a second variant of child-resistant service plug according to the invention, this variant being of the "squeeze, turn" type.

 - Figure 5 is a cross-sectional view along the line V-V of Figures 4A and 4B.

 - Figures 6 and 7 are two bottom views of the plug of Figures 4A, 4B respectively in the closed position and in the open position.

 - Figure 8 is an external elevation view, on a smaller scale of the plug according to the second variant.

 - Figure 9 is an external elevation view of a third variant of child-resistant service plug derived from the second variant with a tamper-evident ring.

 - Figure 10 is a cross-sectional view along line X-X of Figure 9.

 The invention relates to a child-resistant stopper. In particular, such a cap is designed to meet the requirements of the AFNOR H.00-201 standard.

 Such a stopper is intended to be mounted on a container which is not completely shown, such as a flask or a bottle.

 In the application considered in which the content is a flammable or toxic or corrosive or more generally dangerous liquid material especially for children and household use, the container can be made of deformable plastic material having a certain resistance but which can be pressed by action manual. Such a container comprises a neck or neck C on which the cap is mounted by screwing, forced pressing, crimping, gluing, welding or the like.

 The stopper is intended to remain, as a whole, associated permanently and completely with the container.

 The stopper, although comprising several parts or parts, forms a unitary whole, the parts or parts made up being assembled together permanently. They are thus delivered assembled to the content conditioner and remain assembled at the user's place. To allow opening (and vice versa closing), appropriate relative displacements of the constituent parts or parts are carried out with respect to each other, as described.

 The plug according to the invention has a main axis 1 which is a general axis of revolution. By this is meant that the axis 1 is an axis of overall symmetry being specified that certain parts of the plug are asymmetrical or located on certain angular zones. The axis 1 is also the axis of the neck or neck of the container.

 The relative movements for opening and closing are an axial sliding along the axis 1 or a combination of movements including such an axial sliding, for example a helical pivoting around and along the axis 1.

 In the text, what extends along axis 1 is called "axial", a plane qualified as axial passing through axis 1; "radial" which extends in a perpendicular and secant direction from axis 1; "orthogonal" which extends in a direction orthogonal and not intersecting to axis 1; "transverse" plane a plane perpendicular to axis 1 and therefore to any axial plane; "lower" (or lower) that which is located or turned towards the neck or neck (and this with reference to the conventional position of the container with its cap placed upwards); and conversely from "upper" (or upper) that which is situated or turned towards the opposite of the neck or neck.

 The stopper according to the invention essentially comprises two parts assembled together, an internal cap 2 and an external cap 3. These parts are made of molded plastics, each of them in one or more pieces, sections, parts according to the requirements imposed. by the shape they present and the manufacturing process used such as molding.

 In the third variant considered, the cap also comprises a tamper-evident ring 4 which may or may not be removable, but which can be torn off, for example by a gripping tab 5 and a weakening zone of lesser thickness 6.

 In the various variants considered, the internal cap 2 comprises a base 7 and a chimney 8 having at least one lateral opening 9. The description is made with a part referenced 7 called "embasse" which can of course be the neck C of the internal bottle. And the outer cap 3 includes an inner skirt 10, an outer skirt 11, a nozzle 12, a discharge hole 13, and a passage 14 for the contents of the container.

 The entire plug has, on the outside, a generally cylindrical or conical shape with an enlarged lower base.

Its upper part through which the content can be distributed through the hole 13 has a generally conical or frustoconical shape, the opening angle possibly being of the order of 60 ° to 90 °
The cap 2 is described as internal because at least one part of it is located and housed in the cap 3 placed outside and around radially and facing it, hence for the latter the qualification d 'external.

 The internal cap 2 is rigid. It serves as a support for the external cap 3. It is fixed to the container.

It is hollow and essentially comprises a wall of more or less tormented shape, with the exception of opening 9.

 The base 7 hollow and radially enlarged relative to the chimney is intended to be fixed to the neck of the container as already mentioned. It is therefore located in the lower part of the plug.

 The chimney 8 is adjacent to the base 7. It extends it coaxially upwards. It is radially smaller than the base 7. It is also hollow and in communication with the base 7.

 The chimney 8 extends axially and includes a lower part 15 for connection with the base 7 and, on the opposite side, upwards, a closed free end part 16.

 The opening 9 placed laterally is more or less spaced from the free end 16, the latter free end 16 thus closed being capable of closing and closing the hole 13. There is provided a single opening 9 or several openings distributed angularly around the axis 1 and / or axially along it. The direction of passage of the content through an opening 9 is radial or substantially radial.

 The external cap 3 and more especially the external skirt 11 has a certain elastic deformability.

 The two skirts 10 and 11 are concentric, spaced apart radially and placed opposite one another.

They are separated by an annular cylindrical free space 18. The two skirts 10, 11 are both directed downwards and the base 7, therefore opposite the chimney 8.

 At their respective upper ends 19, 20, the two skirts 10, 11 are connected to the end piece 12 which coaxially extends the two skirts 10, 11. This end piece 12 has the conical or frustoconical shape already mentioned. It is placed around and outside the chimney 8 towards its upper external part 17, the end of which constitutes part 16.

 The discharge hole 13 is located at the upper free end part 21 of the end piece 12 opposite to that lower 22 for connection with the skirts 10 and 11 at 19 and 20. This upper end 21 is arranged in a transverse plane from where the frustoconical form already mentioned.

 The hole 13 has the same dimension and a shape complementary to that of the free end part 16. Consequently the part 16 can be accommodated by penetrating into the hole 13 which has the effect of closing and closing it, in the position closing the plug since part 16 is full. However, the part 16 can be dissociated from the hole, that is to say spaced axially from it. The hole 13 is then opened and allows the passage and the distribution of the content (in the open position of the plug).

 There is provided between the two caps 2, 3 a free space forming the annular cylindrical passage 14 tapering conically upward and extending downward from the opening 9 to the top at the hole 13. This passage 14 is delimited by the chimney 8, the internal skirt 10, the end piece 12. This continuous passage allows the contents of the container to pass to the hole 13.

 The external skirt 11, at least, is deformable transversely elastically in the radial direction under the action of suitable centripetal external diametric stresses applied towards (at or near) the lower free edge 23 of the skirt 11 opposite the end 20. This constraint is that applied by the user's fingers pressing on the plug at the locations indicated. It has the effect of causing an ovalization of the skirt 11.

 One or more pairs of projections 24, 25 are also provided, respectively adjoining on the one hand the external skirt 11 towards its lower free edge 23 on its internal face facing the axis 1 and on the other hand the internal cap 2 on its external face turned towards the external skirt 11. The projection 25 is located facing radially from the projection 24. These projections 24, 25 are stops, lugs, notches or other equivalent shapes. The two projections 24 and 25 of each pair of projections are such and arranged in such a way that when the plug is in the closed position and in the absence of any external constraint, they cooperate and functionally interfere with each other with first effect of blocking at least certain relative displacements of the caps 2, 3 relative to one another and second effect of preventing the opening of the cap. The two projections 24, 25 cannot be released one on the other and therefore the previously impossible relative movements made possible only by a suitable external constraint capable of appropriately ovalizing the external skirt 11 as already indicated. It is then possible to open the cap.

 The projections 24, 25 are therefore projections for the protection of children.

 As described, the projections 24, 25 are arranged to prevent a relative movement of axial sliding (first variant) or also a substantial pivoting movement (second variant).

 Additional members 26, 27 are also provided respectively of the internal skirt 10 on its internal face turned towards the axis 1 and of the internal cap 2 while being turned towards the internal skirt 10. These members 26, 27 are located opposite radially . By their functional cooperation, the members 26, 27 allow at least a relative axial sliding movement of the two caps 2, 3 relative to each other over a certain stroke, two parts 2, 3 of the plug always remain associated. As described, these members 26, 27 are projections, pins, grooves, grooves, threads or the like.

 On the assumption that the container and the internal cap 2 to which it is rigidly fixed are fixed, the external cap 3 is movable between two extreme positions which correspond to two structural and functional positions also extreme of the stopper: a retracted, low position, closing and a projecting, high, opening position.

 In the closed position (FIGS. 1A and 4A), the free end 16 closes the hole 13. In this position, the external cap 3 is located, relative to the internal cap 2 in its lower extreme relative position.

In this position the only opening of the passage 14 is the hole 13. In fact the envelope of the passage 14 is full, with the exception of the hole 13 or provided with sufficient sealing at the junction of the two caps 2, 3 shaped as shape and size therefor.

 In the open position (Figures 1B and 4B), the free end 16 leaves the hole 13 open because it is axially spaced from it. In this position, the outer cap 3 is located, relative to the inner cap 2, in its upper extreme relative position. The upper free end 16 is then entirely located in the end piece 12.

 The passage from the closed position to the open position implies at least the application of the external constraints already mentioned, capable of ovalizing the external skirt 11 and therefore of releasing the projections 24 and 25 from one another. This passage results from a sliding movement (first variant) or rotational and helical sliding (second variant).

 Reference is now made more specifically to the first variant and to FIGS. 1A, 1B, 2 and 3.

In this first variant, the base 7 surrounds the neck C with which it is associated by means of functional projections 28 and 29 respectively. The base 7 comprises an annular wall 30 transverse to its upper free edge. To this wall 30 is attached, on the side opposite to the base 7, the chimney 8, with an outward projection 31 forming a seat for the lower free edge 32 of the internal skirt 10. A flange 38 is attached to the wall 30, on its internal circular edge on the same side as the base 7. This flange 38 is housed with friction and sealing in the neck or neck
C. The opening 9 is located in the vicinity of the end 16 in the upper part 17 narrowed radially towards the end 16 by a transverse step 33, on which the end piece 12 abuts in the closed position.

 The outer skirt 11 has substantially the same diameter as the base 7; these actually come in extension of one another, with a small annular space in the open position.

 The passage 14 is also limited in this variant by the step 33.

 The child protection protrusions are, for the skirt 11, pins 24 directed radially inwardly extending over a certain limited peripheral stroke of the skirt 11 (see FIGS. 2 and 3). This peripheral stroke can correspond to an angular opening of the order of 30. Apart from the lugs 24, the skirt 11 is devoid of projections such as 24. There are provided two diametrically opposite projections. For the internal cap 2, the projections are two notches 25 directed radially outward on the wall 30 and also extending over the same peripheral stroke of the cap 2. There are provided two support zones 34 identified as such on the outer face of the outer skirt 11, in the vicinity of its lower free edge 23 diametrically opposite along an axis perpendicular to that along which the lugs 24 are located. These areas 34 are identified, for example, by means of anti-slip notches. By pressing on the two zones 34, the outer skirt 11 is caused to ovalize, therefore the spacing of the two lugs 24. This spacing is sufficient taking into account the radial dimensions of the projections 24, 25 so that the lugs 24 can escape the notches 25 The relative movement of the outer cap 3 relative to the inner cap 2 hitherto limited to the axial pivoting can then also be that of an axial sliding.

 The internal skirt 10 surrounds the chimney 8 while being in the immediate vicinity. The members 26, 27 are grooves and lugs. Thus, in the embodiment shown, there are provided three grooves 26 on the internal face of the internal skirt 10 and three corresponding pins 27 formed on the chimney 8 at its lower part 15. The pins 27 can, when placed opposite grooves 26, penetrate and slide axially therein. Two signs such as arrows 35, 36 located on the external faces of the two internal 2 and external 3 caps respectively notably the base 7 and the external skirt 11 make it possible to identify the relative angular position in which the pins 27 are placed opposite the grooves 26.

It is then possible, provided that the projections 24, 25 have been or are simultaneously unlocked, as already indicated, to slide the outer cap 3 along the axis 1 to bring it into the open position. The pins 24, notches 25, grooves 26 and pins 27 are arranged angularly so that when the pins 27 are located opposite and in correspondence with the grooves 26, the pins 24 and notches 25 are also opposite and in correspondence with one with the other. Consequently, in the closed position the external cap 3 can rotate freely without being able to slide axially. When the two arrows 35 and 36 are opposite and collinear it is possible to dissociate the lugs and notches 24 and 25 then to slide the lugs 27 in the grooves 26. The grooves 26 may have a short axial stroke, like the lugs 27 The grooves 26 are located immediately adjacent to the edge 32 while the pins 27 are slightly offset upward relative to the recess 31, the axial spacing between them precisely allowing the housing of the bulged part of the skirt 10 adjoining the edge 32 in which the grooves 26 are formed. This swollen part slides with gentle friction over the chimney 8 which serves as a guide. An internal annular bulge 37 also located on the internal skirt 10 higher, for example substantially at the same distance between the free edge 32 and the upper end 19 ensures end-of-travel sliding axial sliding in the open position between the recess 33. This bulge 37 and the recess 33 also provide the necessary seal.

 Reference is now made more specifically to the second variant and to FIGS. 4A, 4B, 5, 6, 7 and 8.

 In this second variant, the internal cap 2 is in two parts rigidly associated with each other, namely a lower part formed essentially by the base 7 and an upper part formed by the chimney 8. For this purpose, it is provided at the lower end of the chimney 8 a transverse wall of annular shape 30 from the inner edge of which is connected the chimney 8. On the outer edge of this wall 30 is adjacent a flange 39 of generally cylindrical shape located on the same side as the chimney 8 therefore extending upwards over a certain axial distance. This flange 39 is rigidly associated for example by gluing or ultrasonic welding, on its lateral external face to the lateral internal face of the free upper extreme part 40 of the base 7.This part 40 forms a kind of neck in which is mounted the assembly formed by the chimney 8, the wall 30 and the collar 39. A transverse projection 41 of the collar 39 coming to bear on the open free edge of the upper free end portion 40 ensures the positioning and the axial locking of the part 8, 30, 39 compared to part 7.

 The projection 41 is located substantially, on the collar 39, midway between the wall 30 and the upper free edge 42.

 On the external face of the base 7 is provided a displacement member 27 in the form of a helical projection with which cooperates a complementary helical thread provided on the internal face of the internal skirt 10, constituting the member 26. Therefore , the relative pivoting of the outer cap 3 relative to the inner cap 2 causes the relative axial sliding of the two caps 2, 3.

 The chimney 8 has, in this second variant, a generally cylindrical shape with a full upper free end 16 and a lower part 15 flared downwards with a frustoconical shape. The opening 9 is formed in the lower part 15 in the vicinity of the wall 30.

 The passage 14 is limited, in this embodiment, by the chimney 8, the wall 30 and the flange 39 and, of course, the end piece 12.

 The tip 12 includes, inside, radial fins 43, regularly arranged around the axis 1 (for example six fins as shown in Figure 5).

These radial fins 43 extend over a certain axial distance and each define an inner and upper guide edge 44 and an outer and lower guide edge 45.

 The guide edges 44 are adjacent to the hole 13, around the latter. They guide the end piece 12 relative to the chimney 8. The guide edges 45 have a diameter radially greater than that of the edges 44.

They are headed down. They guide the inner face of the flange 39 in the vicinity of its upper free edge 42. In the closed position, the flange 39 is housed towards its upper free end part outside the fins 43 between the edges 45 and the lower end 22. In the open position, the fins 43 remain engaged by the lower end of their edge 45 on the flange 39 in the immediate vicinity of its edge 42.

 Due to the arrangement described on the basis of fins 43, the passage 14 remains open and possible between the fins.

 The child protection projections are, for the skirt 11, two lugs 24, diametrically opposite, directed radially inwards, having in cross-section a bend shape with a base 46 adjoining the skirt 11, directed radially and a wing 47 of orthogonal general direction.

 For the internal cap 2, the projections are two stops 25, directed radially and outwards, located towards the lower free end part 48 of the base 7 opposite to the part 40. Each stop 25 has a pawl shape and comprises an axial face 49 extending radially and an inclined face 50. The wing 47 and the faces 49, 50 are arranged so that the wing 47 comes to lock substantially perpendicularly on the face 49.

 I1 is also provided, as in the case of the first variant, two support zones 34 identified as such on the external face of the external skirt 11 in the vicinity of its free edge 23, diametrically opposite along an axis perpendicular to that along which the lugs are located 24.

 Another end stop 51 of the same type as the stops 25 is also provided, angularly offset from one of the stops 25. On this end stop 51 is capable of coming to lock a lug 52 of the same type than lug 24 already described. This situation makes it possible to limit the pivoting stroke of the outer cap 3 relative to the inner cap 2 to a fraction of a half turn, for example 1/3 of a turn.

 To ensure the efficiency of the pins and stops 24, 25, 51, 52 in any relative axial position of the outer cap 3 relative to the inner cap 2, these stops and pins extend over a certain distance axially.

 The advantage of the stop 51 and the lug 52 is, in addition to limiting the opening to a fraction of a half turn, above all making it impossible to make a second ovalization to completely disassemble the external cap 3 of the neck C; the support zones 34 on the outer cap 3 being opposite with the notches 25 of the inner cap 2.

 When the plug is in the closed position, it is blocked in rotation by the lugs 24 coming to lock on the stops 25. By pressing on the zones 34, the external skirt 11 is ovalized which makes it possible to release the lugs and stops 24 , 25. The outer cap 3 can then be pivoted about the axis 1. This pivoting ensures the axial sliding due to the members 26, 27 forming a helical screw. This movement is limited to a fraction of a half turn when the stops and lugs 51, 52 again come into lockout (Figure 7). In this situation, it is impossible to re-ovalize the skirt 11 because the support zones 34 are located in line with the stops 25.

 We now refer to the third variant and Figures 9 and 10. In this case, there is provided a tamper-evident ring 4 with gripping tab 5 and weakening zone 6. This tamper-evident ring is connected to the skirt external 11 by a zone of lower resistance 53 comprising for example fragile bridges. Such a tamper-evident ring is of a type known per se, for example from document FR-A-2 449 611. In this variant embodiment, the stops 24 are produced on the tamper-evident ring.

 Two projections 54 on the internal face of the tamper-evident ring 4 prevent the childproof opening in force. The more one presses on the pressure zones 34 to ovalize the outer cap 3, the more these projections get wedged in the complementary notches 55 of the neck C and prevent the rotation of the outer cap 3 before having torn the ring 4 by pulling on the tab 5.

These two projections 54 are on the same axis as the pressure zones 34.

Claims (14)

 1. Child-proof service plug, intended to be mounted on a container neck (C) characterized in that it comprises  - an internal cap (2) having  - a hollow and enlarged mounting base (7)  at the pass  - a chimney (8) adjoining and narrower  that the base (7) and extending it  axially having  -a closed free end part (16)  opposite the base (7); and  at least one passage opening (9)  contents of container removed from  the free end (16) of the chimney  (8  - a hollow external cap (3) mounted at  outside and around the inner cap (2)  having  - an internal skirt (10) and an external skirt  (11) concentric radically separated and  facing each other and directed to  the opposite of the chimney (8);  - an end piece (12) attached and extending  axially the two skirts (10, 11) placed  around the chimney (8) towards its part  extreme free (16)  at least one content discharge hole (13)  container located at the free end  end piece (12), in size and shape  complementary to the free end  the chimney (8) ;; - at least one continuous passage (14) for the  contents of container from opening  passage (9) to the discharge hole (13)  delimited by the chimney (8), the skirt  internal (10) and end piece (12)  deformability of the outer skirt (11) in  transverse radial direction under the action  external diametric constraints,  centripetal and suitable applied to  its free edge (23) causing a  skirt ovalization (11)  adjoining projections (24, 25)  respectively to the outer skirt (11) towards  its free edge (23) and its internal face and in  look at the internal cap (2) and  likely and in the absence of  external constraints to interfere with  with each other to block certain  relative movements of the outer cap  (3) relative to the internal cap (2) and  to be released from each other by a  suitable external stress causing  ovalization of the outer skirt (11); and  - complementary organs (26, 27)  respectively of the internal skirt (10) on  its internal face and the internal cap (3)  capable of enabling, through their cooperation,  minus the relative axial sliding of the  outer cap (3) relative to the cap  internal (2)  The external cap (3) being able to be, relative to the internal cap (2) in two extreme relative positions, namely a retracted closing position and a projecting opening position so that in the closed position the extreme free part ( 16) of the chimney (8) closes the discharge hole (13), that in the open position the free end part (16) of the chimney (8) leaves the discharge hole (13) free, and that the passage from the closed position to the open position involves at least the application of external stresses suitable for ovalizing the external skirt (11) and at least one other operation.  2. Cap according to claim 1, characterized in that the internal cap (2) is in one or more parts.  3. Stopper according to any one of claims 1, 2, characterized in that projections (43, 37) adjoining the end piece (12) or the internal skirt (10) cooperate with the chimney (8) to participate axial guidance of the outer cap (3) on the inner cap (2) and possibly sealing.  4. Stopper according to any one of claims 1 to 3, characterized in that the end piece (12) has a generally conical or frustoconical shape whose apex is towards its free end part (21).  5. Plug according to any one of claims 1 to 4, characterized in that the internal cap (2) comprises profiled walls (15, 17, 30, 33, 39) delimiting and forming the passage (14) to the exception of the hole (13) and the opening (9).  6. Plug according to any one of claims 1 to 5, characterized in that the projections (37, 33) of the internal skirt (10) and the internal cap (2) have the function of ensuring by their cooperation a blocking sliding axially.  7. Plug according to any one of claims 1 to 6, characterized in that the projections (26, 27) of the outer skirt (11) and the inner cap (2) are located at the opposite locations corresponding to the relative position possible axial sliding angle of the outer cap (3) relative to the inner cap (2).  8. Stopper according to any one of claims 1 to 7, characterized in that the complementary members of the internal skirt (10) and the internal cap (2) are at least a pair of pins (27) and grooves (26 ) complementary and able to cooperate with each other having a certain angular localization corresponding to the relative angular position of possible axial sliding of the outer cap (3) relative to the inner cap (2).  9. Stopper according to any one of claims 1 to 8, characterized in that it comprises on the visible external faces of the external skirt (11) and of the internal cap (2) registration marks (35, 36) of the relative angular position of axial sliding possible of the outer cap (3) relative to the inner cap (2).  10. Plug according to any one of claims 1 to 5, characterized in that the projections (24, 52) of the outer skirt (11) and (25, 51) of the inner cap (2) have the function of ensuring by their cooperation a pivoting blocking on a certain stroke.  11. Plug according to any one of claims 1 to 5 and 10, characterized in that the complementary members (26, 27) of the internal skirt (10) and the internal cap (2) is of the screw thread type.  12. Plug according to any one of claims 1 to 5, 10 and 11, characterized in that the projections (52) of the outer skirt (11) and (51) of the inner cap (2) have the function of preventing a second ovalization of the outer skirt (11)  13. Stopper according to any one of claims 1 to 12, characterized in that qucil further comprises a tamper-evident ring (4) with a tear-off tab (5).  14. Stopper according to any one of claims 1 to 13, characterized in that it comprises on the internal face of the tamper-evident ring (4) projections (54) preventing the opening of the stopper by force.