FR3066680A1 - COSMETIC PRODUCT DISPENSING HEAD, DEVICE AND METHOD THEREOF - Google Patents

Abstract

This head (16) comprises: - a tubular duct (30) defining a passage (32) for the cosmetic product (14), - a piercing member (48) of a lid, movable between an initial position and a position of piercing the lid, the piercing member (48) comprising a finger (53) and a sleeve (54), - a cap (49) mounted around the piercing member (48), the cap (49) being rotatably mounted relative to the tubular duct (30), - a drive mechanism (50) in joint rotation of the piercing member (48) with the cap (49), the piercing member (48) being moved in translation with respect to the cap (49) during rotation, and - a locking mechanism (51) in position of the piercing member (48) relative to the cap (49) in the piercing position.

Description

Cosmetic product dispensing head, associated device and method

The present invention relates to a cosmetic product distribution head, of the type comprising: - a tubular cosmetic product distribution duct defining a passage for the cosmetic product, the tubular conduit having a thread, and - a member for piercing a cover intended to be placed at an edge of the passage, the piercing member being movable between an initial position and a piercing position of the cover in which the piercing member protrudes out of the passage, the piercing member comprising a finger extending in the passage and a sleeve extending around the tubular conduit, the sleeve having a complementary thread, the thread and the complementary thread being engaged with each other. The invention also relates to a device for packaging and dispensing cosmetic product closed by such a dispensing head.

This head is intended in particular to close the reservoir of a device for packaging a cosmetic product, for example a coloring product, in order to avoid contact of the cosmetic product with oxygen, likely to cause its deterioration, or even degradation of its properties.

More generally, such heads are used to close the reservoir of a device for packaging a cosmetic product, for example a hair product, or a hygiene product, or a care product for the face and / or the body, or a make-up product, or a sunscreen product, so as to avoid the oxidation or loss of active ingredients of said cosmetic product.

A cosmetic product is advantageously a product as defined in Regulation EC N ° 1223/2009 of the European Parliament and Council, dated November 30, 2009, relating to cosmetic products. FR 2 960 529 describes a self-piercing plug movable between an initial position and a drilling position by unscrewing the plug. FR 2 994 951 describes a perforator stopper of the lid of a tube, the screw of which on the body of the stopper allows it to be fixed on the neck of the tube. FR 3,000,037 describes a tube head associated with a perforator plug with a spacer ring ensuring the integrity of the seal before the first use. FR 3 009 287 describes a drilling punch movable between an initial position and a drilling position comprising a barrel-shaped body suitable for piercing the lid. FR 3 012 019 describes a head of the aforementioned type, mounted at the free end of a container. The container is initially closed by a cover capable of being pierced. The stopper provided with the piercing finger is held in an initial raised position relative to the cap, using a peelable ring mounted at the base of the stopper between the neck and the stopper.

When the user wishes to use the coloring product, he detaches the peelable ring. Then, he screws the cap on the neck of the container until the finger pierces the lid, allowing the release of the product contained in the container.

Such a device, however, is not entirely satisfactory. In particular, for hairdressers, the gesture to detach the peelable ring and pierce the cap of the product reservoir is relatively tedious to implement.

An object of the invention is to have a head allowing the safe storage of cosmetic product in a container, while offering an easy-to-use gesture. To this end, the subject of the invention is a dispensing head of the aforementioned type, in which the head further comprises: - a cap mounted around the piercing member, the cap being rotatably mounted relative to the tubular conduit around 'an axis of rotation, - a mechanism for driving in joint rotation of the piercing member with the cap, the piercing member being moved in translation relative to the cap from its initial position to its piercing position during the joint rotation of the cap and the piercing member, and - a locking mechanism in position of the piercing member relative to the cap in the piercing position.

Having the cap and the striker in two separate parts allows them to be made in two separate materials (for example one to achieve the decor and ergonomics, the other to ensure the impact function thanks to its rigidity ). In addition, the gestures are simplified because the percutage is done in a single screwing gesture. This further promotes standardization because the cap can be of variable structure and correspond to the needs of different devices (shade, shape, completion, personalization), while the striker remains functional and common to several devices.

The locking mechanism allows the piercing member to move freely relative to the cap to the piercing position of the cover, and once it has been pierced, to join the cap to allow opening or / and closing the container. Thus, only one rotational movement is necessary at a time to cause the drilling and then the release of the tubular conduit. The gesture of use is therefore particularly simple. The blocking position is only effective at the end of the percussion operation. It guarantees the tightness of the tube head. The click of passage of the stops of the blocking mechanism indicates that the percutaneous operation is carried out successfully.

In particular embodiments of the invention, the dispensing head also has one or more of the following characteristics, taken in isolation or according to any technically possible combination (s): locking mechanism in position comprises at least one stop protruding radially from one of the piercing member and the cap and at least one complementary stop protruding radially from the other of the piercing member and of the cap, the stop being located below the complementary stop in the initial position, the stop being located beyond the complementary stop in the drilling position.

The realization of the blocking mechanism by a stop cooperating with a complementary stop is simple to perform, while providing stable positioning in the blocking position. Without a locking position, the two parts would not be integral, and when the cap is unscrewed, the piercing member could remain on the tubular distribution duct. - the locking mechanism in position comprises at least two complementary stops spaced along the axis of rotation, the stop being located between the complementary stops in the drilling position. - at least one additional stop is annular.

The presence of complementary stops spaced axially and possibly annular, simplifies and makes the installation of the stop easier and more reliable. At least one of the upper stops is partial to facilitate passage into the locked position. The lower stop is annular to provide good aesthetics.

Furthermore, thanks to these provisions, when it is in the drilling position, the drilling member is locked axially relative to the cap in both directions along this axis, the stop cooperating with a first complementary stop to prevent the piercing member returning to the initial position relative to the cap in a first axial direction under the effect of the rotation of the cap in a first direction of rotation. The stop cooperates with a second complementary stop to prevent the piercing member from going beyond the piercing position relative to the cap in a second axial direction opposite to the first axial direction, under the effect of the rotation of the cap in a second direction of rotation opposite to the first direction of rotation. Thus, when it is in the drilling position, the piercing member is integral with the cap, both in rotation and in translation, these two elements forming an integral assembly easily manipulated by the user. The piercing member and the cap have an invariant relative radial position and a relative axial position which varies during the entire drilling operation: drilling starts while the striker is not yet in the axial locking position. - The piercing member comprises at least one radial extension projecting radially away from the axis of rotation from the sleeve, the stop or the complementary stop being carried by the radial extension.

The arrangement of the stopper on a radial extension lightens the structure of the piercing member, while offering effective cooperation with each complementary stopper. - the head has a temporary blocking mechanism between the cap and the piercing member, the temporary blocking mechanism being active in the initial position and being inactive in the piercing position. - The temporary blocking mechanism includes a locking tab carried by the piercing member and a complementary locking tab carried by the cap, the locking tab cooperating with the complementary locking tab in the initial position. - the detachment torque of the temporary blocking mechanism when the cap is rotated relative to the tubular conduit in a first direction is less than the detachment torque of the blocking mechanism in the drilling position during a reverse rotation of the cap by relative to the tubular conduit in a second direction opposite to the first direction.

The provision of a temporary blocking mechanism operating in particular by snap-fastening stabilizes the position of the cap on the piercing member before the first use, without significantly disturbing the gesture of use. This system avoids any collapse of the cap at rest, and retention on the tube; an alternative would have been to make tight longitudinal ribs; however, such tightening would then be detrimental to the proper translation of the piercing member relative to the cap in operation. the joint rotation drive mechanism comprises at least one axial rib carried by one of the piercing member and the cap and an axial groove delimited by the other of the piercing member and the cap, the rib being able to move in axial translation in the groove during the rotation of the cap relative to the tubular conduit. - The cap is adapted to be driven exclusively in rotation relative to the tubular conduit without translation relative to the tubular conduit to pass the piercing member from the initial position to the piercing position. - the piercing member has a transverse connecting wall, closing the sleeve at its upper end, the finger extending from the transverse connecting wall. - In the drilling position, the cap and the piercing member can be unscrewed jointly relative to the tubular conduit to free the passage.

The drive mechanism between the cap and the piercing member allows the device to be used very simply by simply rotating the cap around an axis. The invention also relates to a device for packaging and dispensing cosmetic product, comprising a reservoir containing a cosmetic product, a cover and a dispensing head as defined above closing the reservoir. The invention also relates to a method of dispensing a cosmetic product comprising the following steps: - supply of a device as defined above, the piercing member occupying its initial position, - joint rotation drive of the cap and the piercing member, - displacement in translation of the piercing member relative to the tubular conduit to pass the piercing member into the piercing position of the cover, - activation of the locking mechanism to block in position the piercing member relative to the cap in the piercing position, then - joint movement of the piercing member and the cap away from the tubular conduit, - distribution of cosmetic product through the tubular conduit. Other characteristics and advantages of the invention will appear on reading the description which follows, given solely by way of example, and made with reference to the accompanying drawings, in which: - Figure 1 is a sectional view axial center of a cosmetic product packaging device according to the invention, the piercing member having pierced the cap, - Figure 2 is a view similar to Figure 1, after assembly of the piercing member with the cap, the temporary blocking between the piercing member and the cap being active, - Figure 3 is a view similar to Figure 1, during the distribution of cosmetic product, the permanent blocking between the piercing member and the cap being active.

The terms "upstream" and "downstream" are generally understood in the following with respect to the normal direction of distribution of the product during use.

A first device 10 for packaging and distributing cosmetic product is illustrated in FIGS. 1 to 3.

The cosmetic product is a cosmetic product for coloring, care, or make-up. It advantageously contains a compound liable to degrade by contact with air, in particular by contact with oxygen contained in air.

The device 10 comprises a reservoir 12 containing the cosmetic product 14, a cover 17 closing the tank 12 (visible in FIG. 2), and a dispensing head 16 mounted on the tank 12 downstream of the cover 17.

The reservoir 12 has a side wall 18 and a bottom 19 closing the side wall 18 at a first end 22. At the second end 24 of the wall, opposite the end 22, the reservoir 12 defines an upper opening of the reservoir 12 intended at the outlet of cosmetic product 14 from the reservoir 12. The cover 17 is overmolded in a sealed manner in the reservoir 12 to close the opening. The cover 17 is in particular a plastic film membrane.

The dispensing head 16 comprises an insert 28 fixed to the reservoir 12 and a drilling and closure assembly 40 removably mounted on the insert 28. The insert 28 comprises a tubular conduit 30 defining an axial passage 32 for the cosmetic product 14, and a skirt 34 widening radially from the upstream edge of the tubular conduit 30.

The tubular conduit 30 extends along a longitudinal axis A-A ’. It has a connection edge 42 to the skirt 34, extending opposite the cover 17. It has an opposite edge 44 for output of cosmetic product 14 from the packaging device 10. The tubular conduit 30 has an external thread 46 disposed on its external surface oriented opposite the passage 32.

The skirt 34 projects radially from the connection edge 42. It connects the tubular conduit 30 to the upper edge of the side wall 18 of the reservoir 12. The drilling and closing assembly 40 comprises a drilling member 48, which can be moved between an initial mounting position, and a position for piercing the cover 17. The piercing and closing assembly 40 further comprises a cap 49, arranged around the piercing member 48 while being rotatably mounted with respect to to the tubular conduit 30 around the longitudinal axis A-A 'without relative translation relative to the tubular conduit 30 along the axis A-A' during rotation. It also includes a drive mechanism 50 between the cap 49 and the piercing member 48. The piercing and shutter assembly 40 further comprises a mechanism 51 for blocking the piercing member 48 in its position drilling and a temporary locking mechanism 52 of the cap 49 on the piercing member 48 in the initial position of the locking member 48. The piercing member 48 comprises a hollow finger 53, a peripheral sleeve 54 disposed around the finger 53, a transverse closing wall 55, a transverse connecting wall 59 and a radial extension 56 projecting from the sleeve 54.

The finger 53 extends at least partially inside the passage 32. The outside diameter of the finger 53 is less than the inside diameter of the passage 32. The length of the finger 53 is greater than that of the passage 32.

The finger 53 has a junction end to the sleeve 54, and a free end 58. The free end 58 is suitable for projecting out of the passage 32 and for cutting the cover 17 at the right of the passage 32, along the entire periphery of the cover 17 at the right of passage 32 or along only part of the periphery of the cover 17 at the right of the passage 32, a portion of the cover 17 then remaining connected to the skirt 34 of the insert 28, when the the piercing member 48 is in the piercing position. The free end 58 defines, for example, a cutting edge and / or comprises piercing teeth of the cover 17.

In the illustrated embodiment, the transverse closure wall 55 of the piercing member 48 is provided on the finger 53 in the vicinity of its free end 58. The transverse closure wall 55 transversely closes the hollow finger 53 and separates the latter in two cavities 55A, 55B. One of the cavities 55A is intended to be oriented towards the outside of the reservoir 12 and the other of the cavities 55B is defined by the hollow finger 53, in the vicinity of its free end 58, and is intended to be oriented towards the interior of the reservoir 12. The transverse closure wall 55 reinforces the protection of the product contained in the reservoir against oxygen, in particular after cutting the cover 17.

Furthermore, the radially outer wall of the finger 53 is provided with an annular bead 53A adapted to scrape the inner wall of the tubular conduit 30 when the drilling and closure assembly 40 is replaced on the tubular conduit 30, so as to bring back towards the interior of the reservoir 12 the product having adhered to the interior wall of the tubular conduit 30 during a distribution of product through the passage 32. For more details on the structure and the functioning of such a bead scraper, reference may be made to the aforementioned document FR3012019.

The sleeve 54 extends around the longitudinal axis A-A ’in the drilling position. It has an internal face 60 oriented towards the finger 53. The internal face 60 has a complementary thread 62 on the internal face of the sleeve 54, suitable for cooperating with the external thread 46 located on the external surface of the tubular conduit 30.

The sleeve 54 extends coaxially around the tubular conduit 30 when the piercing member 48 is in the piercing position. To this end, the inside diameter of the sleeve 54 is greater than the outside diameter of the tubular conduit 30.

The transverse connecting wall 59 joins the finger 53 and the sleeve 54 at their upper ends. The second transverse closure wall 55 extends through the finger 53 to close it at its center. The radial extension 56 of the sleeve 54 projects radially from the free end of the sleeve 57. It extends substantially to the cap 49. The piercing member 48 is able to move in rotation and in translation simultaneously along the axis AA ′ with respect to the tubular conduit 30, between the initial position shown in FIG. 2, and the drilling position illustrated in FIG. 1.

In the initial position, the sleeve 54 is partially engaged around the tubular conduit 30. The free end of the finger 58 extends above and away from the cover 17.

In the drilling position, an additional length of the sleeve 54 is engaged on the tubular conduit 30 and the drilling member 48 has passed through the cover 17 to protrude out of the tubular conduit 30, towards the interior of the reservoir 12 .

The cap 49 is mounted on the piercing member 48. It comprises a peripheral wall 66, and a transverse closure wall 72.

The peripheral wall 66 extends around the piercing member 48 when the piercing member 48 is in the piercing position.

The transverse closure wall 72 extends transversely with respect to the axis A-A ’, at the downstream end 74 of the peripheral wall 66, closing the cover 49.

The drive mechanism 50 is suitable for allowing the joint rotation of the piercing member 48 with the cap 49, and simultaneously the relative movement in translation along the axis AA ′ between the piercing member 48 and the cap 49 between the initial position and the drilling position.

The drive mechanism 50 comprises a cylindrical support wall 78 integral with the cap 49, and at least one axial rib 80 carried by one of the piercing member 48 and the cap 49. It comprises, for each rib axial 80, an axial groove 82 formed on the other of the piercing member 48 and the cap 49.

In this example, the drive mechanism 50 comprises several axial ribs 80 angularly spaced around the axis A-A ’.

The ribs 80 project towards the axis A-A ’from the cylindrical wall 78. They extend parallel to the axis A-A’.

The corresponding grooves 82 are formed in the outer surface of the sleeve 54.

The cylindrical support wall 78 extends around the axis of rotation A-A 'from the transverse closing wall 72 of the cover 49. It is arranged around the sleeve 54 when the piercing member 48 cooperates with the cap 49.

Each rib 80 is received sliding parallel to the axis A-A 'in the groove 82. The cooperation between the rib 80 and the groove 82 during the rotation of the cap 49 causes the piercing member 48 with the joint to rotate. cap 49, while allowing the relative movement in axial translation between the piercing member 48 and the cap 49 during the joint rotation of the piercing member 48 and the cap 49 around the axis AA ′.

The locking mechanism 51 is capable of locking the relative position between the piercing member 48 and the cap 49 when the piercing member 48 reaches the piercing position.

The locking mechanism 51 comprises at least one stop 88 secured to the piercing member 48 and at least one complementary stop 90A, 90B secured to the cap 49.

The stop 88 is arranged on the outer peripheral face of the radial extension 56 of the sleeve 54. It projects radially away from the axis A-A ′ towards the peripheral wall 66 of the cap 49.

The stop 88 has an angular extent less than 360 °.

The complementary stops 90A, 90B are arranged on the peripheral wall 66 of the cap 49. They project radially towards the axis A-A ’.

In the example shown in the figures, the locking mechanism comprises at least two stops 90A, 90B spaced axially along the axis A-A ’. It also includes at least one stop 90C located axially opposite the stop 90A, and angularly spaced from the stop 90A around the axis A-A ’.

The stops 90A, 90C have an angular extent around the axis A-A ’of less than 180 °, in particular less than 90 °.

They delimit between them intermediate passages 91 visible in FIG. 2.

They are adapted to cooperate with the stop 88 to prevent translation towards the initial position of the piercing member 48 relative to the cap 49 when the piercing member 48 has reached the piercing position. For this purpose, the stop 88 is located below the complementary stop 90A, 90C in the initial position, the stop 88 being located beyond the complementary stop 90A, 90C in the drilling position.

The stop 90B extends annularly around the axis A-A ’. It is able to cooperate with the stop 88 to prevent translation of the piercing member 48 beyond the piercing position.

The height of the stop 88 is less than or substantially equal to the height separating the stops 90A and 90B along the axis A-A ', so that the stop 88 is blocked between the two complementary stops 90A, 90B on the cover 49 .

The temporary locking mechanism 52 is capable of locking the relative position between the piercing member 48 and the cap 49 in the initial position of the piercing member 48.

The temporary locking mechanism 52 comprises at least one latching tab 94 projecting along the axis of rotation A-A ’from the transverse connecting wall 59 of the piercing member 48.

The temporary blocking mechanism 52 also comprises a complementary snap-on tab 96 on the transverse closure wall 72 of the cover 49. The snap-on tab 94 and the complementary snap-on tab 96 cooperate with each other to block the locking member. drilling 48 in its initial position.

The detachment torque of the temporary locking mechanism 52 during rotation of the cap 49 relative to the tubular conduit 30 in a first direction is less than the detachment torque of the locking mechanism 51 in the drilling position during a reverse rotation of the cap 49 relative to the tubular conduit 30 in a second direction opposite to the first direction.

The operation of the cosmetic product packaging device 10 will now be described.

Initially, the reservoir 12 is closed by the cover 17. The drilling and closure assembly 40 is positioned on the tubular conduit 30. The finger 53 of the drilling member 48 is disposed in the passage 32 in the position initial visible in FIG. 2. The cap 49 is mounted around the piercing member 48.

The temporary blocking mechanism 52 is active. The locking tab 94 and the complementary locking tab 96 cooperate to block the relative position between the piercing member 48 and the cap 49.

Advantageously, in this position in which the piercing member 48 is in the initial position and the temporary locking mechanism 52 is active, illustrated in FIG. 2, the upstream end 75 of the peripheral wall 66 of the cover 49 is substantially flush, even is in contact with the skirt 34 of the insert 28. The user grasps the cap 49 and rotates it around the axis AA ′. The rotary drive mechanism 50 drives in joint rotation the cap 49 and the piercing member 48 by lateral cooperation between the ribs 80 and the edges of the grooves 82.

In conjunction with its rotation around the axis A-A ’, the piercing member 48 moves in translation along the axis A-A’. The temporary locking mechanism 52 is released by disengaging the locking tabs 94 away from the complementary locking tabs 96.

The cap 49 remains substantially stationary in translation of the axis A-A ’during its rotation, which simplifies the movement performed by the user.

In particular, the upstream end 75 of the peripheral wall 66 of the cap 49 remains flush with or in contact with the skirt 34 of the insert 28 while the piercing member 48 is moving. The piercing member 48 is gradually screws onto the tubular conduit 30, and moves along and around the tubular conduit 30, until reaching the piercing position of the cover 17. In doing so, the free end of the finger 58 rests on the cover 17. Thanks to the free cutting end 58 and to the rotation of the piercing member 48, the cover 17 is cut completely or partially.

When the piercing member 48 reaches its piercing position, the stop 88 comes into contact with the stops 90A, 90C. It passes over these stops 90A, 90C and is inserted into the annular space between the two complementary stops 90A, 90B. The locking mechanism 51 is then active to lock the piercing member 48 in position relative to the cap 49.

The cosmetic product 14 is then ready to be used. To this end, the user unscrews the cap 49, the locking mechanism 51 allowing the joint movement of the piercing member 48 and the cap 49 without translation relative to one another, thanks to the cooperation between the stops 90A to 90B. The drilling and closing assembly 40 is detached from the tubular conduit 30 and frees the passage 32.

Then, the user tilts the device 10 and / or presses on the reservoir 12 if the latter is deformable in order to distribute the cosmetic product 14 through the tubular conduit 30 outside the packaging device 10.

After cutting the cover 17 and distributing the product through the passage 32 of the tubular conduit 30, when the drilling and sealing assembly 40 is replaced on the tubular conduit 30, the product having adhered to the inner wall of the passage 32 during the distribution of the product is scraped by the annular bead 53A and accumulates inside the cavity 55B of the transverse wall 55 oriented towards the reservoir 12. This part of the product accumulated in the inside the cavity 55B of the transverse wall 55 oriented in the direction of the reservoir 12 advantageously acts as a filter, limiting the intrusion of oxygen inside the reservoir 12 which risks altering the properties of the product contained in the reservoir.

Thanks to the invention described above, the gestures for piercing the cover 17 are greatly simplified. In addition, thanks to the locking mechanism 51 according to the invention, the drilling and closure assembly 40 can be easily reused as a plug of the device 10.

Claims (14)

1. - cosmetic product dispensing head (16), comprising: - a tubular conduit (30) for dispensing cosmetic product (14) defining a passage (32) for the cosmetic product (14), the tubular conduit (30) having a thread (46), and - a piercing member (48) of a cover (17) intended to be placed at an edge of the passage (32), the piercing member (48) being movable between an initial position and a position for piercing the cover (17) in which the piercing member (48) projects beyond the passage (32), the piercing member (48) comprising a finger (53) extending in the passage (32) and a sleeve (54) extending around the tubular conduit (30), the sleeve (54) having a complementary thread (62), the thread (46) and the complementary thread (62) being engaged one with the other, characterized in that the head (16) further comprises: - a cap (49) mounted around the piercing member (48), the cap (49) being rotatably mounted relative to the tubular conduit (30) about an axis of rotation (A-A '), - a drive mechanism (50) in joint rotation of the piercing member (48 ) with the cap (49), the piercing member (48) being moved in translation relative to the cap (49) from its initial position to its piercing position during the joint rotation of the cap (49) and the piercing member (48), and - a locking mechanism (51) in position of the piercing member (48) relative to the cap (49) in the piercing position. 2, - head (16) according to claim 1, wherein the locking mechanism (51) in position comprises at least one stop (88) projecting radially from one of the piercing member (48) and of the cap (49) and at least one complementary stop (90A, 90C) projecting radially from the other of the piercing member (48) and of the cap (49), the stop (88) being located below the complementary stop (90A, 90B, 90C) in the initial position, the stop (88) being located beyond the complementary stop (90A, 90B, 90C) in the drilling position. 3. - head (16) according to claim 2, in which the locking mechanism (51) in position comprises at least two complementary stops (90A, 90B) spaced along the axis of rotation (A-A '), the stop (88) being located between the complementary stops (90A, 90B) in the drilling position. 4, - Head (16) according to one of claims 2 or 3, in which at least one complementary stop (90B) is annular. 5. - Head (16) according to any one of claims 2 to 4, in which the piercing member (48) comprises at least one radial extension (56) projecting radially away from the axis of rotation (A-A ') from the sleeve (54), the stop (88) or the complementary stop (90A, 90C) being carried by the radial extension (56). 6. - Head (16) according to any one of the preceding claims, comprising a temporary blocking mechanism (52) between the cap (49) and the piercing member (48), the temporary blocking mechanism (52) being active in the initial position and being inactive in the drilling position. 7. - Head (16) according to claim 6, wherein the temporary locking mechanism (52) comprises a latching lug (94) carried by the piercing member (48) and a complementary latching lug (96 ) carried by the cover (49), the latching tab (94) cooperating with the complementary latching tab (96) in the initial position. 8. - Head (16) according to one of claims 6 or 7, wherein the detachment torque of the temporary locking mechanism (52) during the rotation of the cap (49) relative to the tubular conduit (30) in a first direction is less than the detachment torque of the locking mechanism (51) in the drilling position during a reverse rotation of the cap (49) relative to the tubular conduit (30) in a second direction opposite to the first direction. 9. - Head (16) according to any one of the preceding claims, in which the drive mechanism (50) in joint rotation comprises at least one axial rib (80) carried by one of the piercing member ( 48) and the cap (49) and an axial groove (82) delimited by the other of the piercing member (48) and the cap (49), the rib (80) being able to move in translation axial in the groove (82) during rotation of the cap (49) relative to the tubular conduit (30). 10. - Head (16) according to any one of the preceding claims, in which the cap (49) is capable of being driven exclusively in rotation relative to the tubular conduit (30) without translation relative to the tubular conduit (30) for moving the piercing member (48) from the initial position to the piercing position. 11. - Head (16) according to any one of the preceding claims, in which in the drilling position, the cap (49) and the drilling member (48) are unscrewable together with respect to the tubular conduit (30) for free the passage (32). 12. - Head (16) according to any one of the preceding claims, in which the piercing member (48) has a transverse connecting wall (59), closing the sleeve (54) at its upper end, the finger ( 53) extending from the transverse connecting wall (59). 13. - Cosmetic product packaging and dispensing device (10), comprising a reservoir (12) containing a cosmetic product (14), a cover (17) and a dispensing head (16) according to any one of claims previous closing the tank (12). 14, - Method for dispensing a cosmetic product (14) comprising the following steps: - supplying a device (10) according to claim 13, the piercing member (48) occupying its initial position, - rotational drive joint of the cap (49) and the piercing member (48), - displacement in translation of the piercing member (48) relative to the tubular conduit (30) to pass the piercing member (48) in drilling position of the cover (17), - activation of the locking mechanism (51) to lock in position the drilling member (48) relative to the cap (49) in the drilling position, then - joint movement the piercing member (48) and the cap (49) away from the tubular conduit (30), - distribution of cosmetic product (14) through the tubular conduit (30).