Container for propelling cosmetic pencils, process for assembling such container and propelling cosmetic pencil

Description

[0001] The present invention relates to a container for propelling cosmetic pencils, to a process for assembling such a container and to a propelling cosmetic pencil comprising such a container.

[0002] The propelling cosmetic pencils are used for applying a cosmetic substance onto the body, usually the face, for instance for the purpose of highlighting the eye contour, eyebrows, lip contour, and so on.

[0003] Cosmetic pencils are known which comprise an outer body made of wood or plastic material and a core (the lead) consisting of a decorative cosmetic substance rigidly and fixedly introduced into the body and substantially extending over the whole length of the body. As the lead tip is being used, it is necessary to sharpen the pencil in order to remove part of the wood or plastic material and to uncover a new lead portion. Pencils of the described type become increasingly shorter with use until they reach such a length that their use becomes so difficult that they often are thrown away without any possibility of fully utilising them. In addition, the lead is only protected by a cap that is removed and put back. During both operations, a casual interference between cap and lead tip can damage said tip and/or soil the cap.

[0004] Also known are propelling pencils like the one disclosed in document GB 516,189. The pencil of this document comprises an outer casing provided at one end thereof with a tapering nozzle through which the lead of cosmetic material is drawn out. The lead is retained by a lead-holder which is prevented from rotating at the inside of the outer casing. The lead-holder can be moved to and fro in the outer casing by a threaded rod connected to a rotary head placed on one end of the casing opposite to the tapering nozzle. The threaded rod is fitted in a threaded housing of the lead-holder that is at the opposite end of the lead. The pulling-out device enables the lead tip to be drawn out of the outer casing only when the pencil is being used.

[0005] It is also known from document US 2004/0020811 a case for lipstick having a tubular casing, a contents carrying unit including a carrier movably disposed in the tubular casing, and a rotary control unit including a rotary member for moving the carrier by rotating the rotary member, which is capable of protruding and retracting contents from and into the tubular casing smoothly by rotating the rotary member. The rotary control unit and the contents carrying unit are molded integrally with a breaking portion interposed therebetween so that the rotary control unit and the contents carrying unit are separated when the carrier is moved away from the rotary member by rotating the rotary member.

[0006] The Applicant has found that the production cost of the propelling pencils of the type described above is greatly affected by the manufacture complexity of the individual elements (usually obtained by moulding of plastic materials) and the complexity of the operations for assembling said elements. In fact, for the assembly of each piece, a lot of time is required as well as use of expensive machines and/or qualified manpower.

[0007] The present invention aims at eliminating the above mentioned drawbacks, by providing a container for propelling cosmetic pencils that is of simple structure and allows easy and quick assembly of the elements forming it.

[0008] It is a further aim of the invention to propose a process for assembling this container which enables use of simple and inexpensive machines and/or non-specialised manpower.

[0009] Another aim of the invention is to propose a propelling cosmetic pencil ensuring correct conservation of the lead until complete use of same.

[0010] The foregoing and still further aims are achieved by a container for propelling cosmetic pencils, a process for assembling a container for propelling cosmetic pencils and a propelling pencil in accordance with the present invention.

[0011] More particularly, in a first aspect the present invention relates to a container for propelling cosmetic pencils as claimed in claim 1.

[0012] In a second aspect, the present invention relates to a process for assembling a container for propelling cosmetic pencils according to claim 10.

[0013] In a third aspect, the present invention relates to a propelling cosmetic pencil as claimed in claim 9.

[0014] The present invention, in at least one of the aforesaid aspects, can in addition have one or more of the preferred features claimed in the dependent claims.

[0015] The present invention will be now described with reference to the accompanying drawings illustrating a preferred but not exclusive embodiment of a propelling cosmetic pencil, in which:

• Fig. 1 is a partly sectioned view of a propelling cosmetic pencil according to the present invention;
• Fig. 2 is an exploded perspective view of the pencil seen in Fig. 1;
• Fig. 3 shows a longitudinal section of a first element of the pencil seen in Figs. 1 and 2;
• Fig. 3a is a cross-section view of the first element, taken along line III-III in Fig. 3;
• Fig. 3b shows a portion of Fig. 3 to an enlarged scale;
• Fig. 4 shows a second element of the pencil seen in Figs. 1 and 2, partly in section;
• Fig. 4a is a cross-section view of the second element, taken along line IV-IV in Fig. 4;
• Fig. 5 shows a third element of the pencil seen in Figs. 1 and 2;
• Fig. 5a is an enlarged portion in longitudinal section of the third element seen in Fig. 5; and
• Fig. 5b shows a further enlarged portion of Fig. 5.

[0016] With reference to the accompanying drawings, a propelling cosmetic pencil according to the present invention has been generally identified by reference numeral 1.

[0017] The cosmetic pencil 1 comprises a container 2 and a lead 3 mounted in the container 2 in an axially movable way.

[0018] In the present specification and in the claims, by "lead" it is intended a cylindrical bar of cosmetic material.

[0019] Container 2, shown in an assembled condition in Fig. 1, comprises a holding body 4 of a tubular shape and circular section, which extends along a longitudinal axis X-X and has a first opening 4a placed at a first, preferably tapering, axial end and a second opening 4b placed at a second axial end opposite to the first one 4a.

[0020] On an inner surface of the holding body 4 there are ribs 5 extending parallel to the longitudinal axis X-X and preferably disposed angularly spaced apart around said axis X-X (as shown in Fig. 3a). In the embodiment given by way of example and not for limiting purposes, the axial ribs 5 are three in number. Radially internal ends of the axial ribs 5 are tangent to a circle substantially having the same diameter as that of lead 3. The axial ribs 5 extend as far as the first opening 4a, preferably starting from an intermediate portion of the holding body 4 (Fig. 3).

[0021] First annular ridges 6 delimiting annular recesses (Fig. 3b) are shaped on the inner surface of the holding body 4 and in the region close to the second opening 4b. In the embodiment given by way of non-limiting example there are three first annular ridges 6.

[0022] The inner surface of the holding body 4 has a conical shape (not shown in the accompanying diagrammatic figures) getting narrower from the second end 4b to the first one 4a, for performing a function that will be described below.

[0023] This conical shape is restricted to the only portion C located not very far from ribs 5 (Fig. 3).

[0024] Container 2 comprises a lead-holder 7 (Figs. 4 and 4a) which in turn comprises a cylindrical wall 8 delimiting a seat 9 for lead 3. Formed on a radially internal surface of the cylindrical wall 8 are axial ridges 10 adapted to interfere with the soft material of lead 3 so as to keep the latter in place once it has been axially inserted in said seat 9 (no translation and no rotation relative to the lead-holder 7). Preferably, the axial ridges extend from a blind bottom of seat 9 until about half-way along wall 8. In the non-limiting embodiment shown, the cylindrical wall 8 is formed with three arched walls disposed in mutual side by side relationship. The side-by-side walls delimit three grooves or axial cuts 11 between each other. The lead-holder 7 further comprises a threaded body 12. Preferably, the threaded body 12 is in the shape of a rod provided with an outer threading extending along an axis Y-Y coincident with the longitudinal axis X-X, once the lead-holder 7 has been mounted in the holding body 4. Said axis Y-Y is also coincident with the longitudinal axis of the cylindrical body 8. The threaded body 12 extends starting from a portion of the lead-holder 7 that is close to the blind bottom of seat 9.

[0025] Container 2 also comprises a driving element 13 (Figs. 5, 5a and 5b) preferably of a tubular type, extending along a longitudinal axis Z-Z. The driving element 13 at a first end thereof 13a comprises a first portion or operating portion 14 having an outer diameter that is substantially identical with the outer diameter of the holding body 4. The driving element 13 comprises a second portion 15 having an outer diameter adapted to enable the same to be inserted into the holding body 4 and an inner diameter capable of enabling the threaded body 12 to be inserted in said second portion 15. Formed at a second end 13b of the driving element 13, in the wall of the second portion 15, are tabs 16 that are flexible, preferably in an elastic manner, along radial directions. Each tab 16 is delimited by a U-shaped notch (partly shown in Fig. 2) formed through the wall of the second portion 15 and extends parallel to the longitudinal axis Z-Z starting from a junction region with the remaining part of said wall towards the second end 13b of the driving element 13. In the embodiment shown, the driving element 13 comprises two opposite tabs 16. Each tab 16, on a radially internal surface thereof, has threaded portions 17 (Fig. 5a) suitable for engagement with the thread of the threaded body 12 belonging to the lead-holder 7.

[0026] Preferably, each tab 16 is further provided, on a radially external surface thereof, with protrusions 18 (Fig. 5a) interacting with the inner wall of the holding body 4. On an outer wall of the second portion 15 and close to the first portion 14 there are second annular ridges 19 confining annular recesses (Fig. 5b). In the non-limiting embodiment shown, there are three second annular ridges 19. Preferably, in addition, an annular seat 20 is formed between the second annular ridges 19 and the first portion 14, for housing a seal 21 (shown in Fig. 2).

[0027] Mounting of container 2 is carried out by first inserting a free end 12a of the threaded body 12 into the second end 13b of the driving element 13 and making said threaded body 12 axially slide within the second portion 15 until bringing the edge of the second end 13b in abutment against an annular surface 22 (Figs. 2 and 4) transverse to axis Y-Y and belonging to the cylindrical wall 8 of the lead-holder 7. During this relative sliding, the threaded portions 17 of the flexible tabs 16 slide on the threading of the threaded body 12 with a slight interference that in any case does not hinder sliding due to the elastic radial deformability of said tabs 16.

[0028] Subsequently, the threaded body 12 together with the driving element 13 are mounted in the holding body 4 by inserting the tubular body 8 through the second opening 4b, seat 9 facing the first opening 4a.

[0029] Due to the conical shape of the inner surface of the holding body 4, when tabs 16 come close to the given axial portion C of the holding body 4, they enter into contact with the inner surface which radially forces them towards the threaded body 12, thus ensuring mutual engagement of the threads.

[0030] Ribs 5 enter the axial cuts 11 of the tubular body 8 so as to prevent mutual rotation between the lead-holder 7 and holding body 4.

[0031] The insertion takes place until bringing an annular surface 23 (Figs. 2 and 5) transverse to axis Z-Z and belonging to the operating portion 14, in abutment against the edge of the second opening 4b.

[0032] The second annular ridges 19 step over the first annular ridges 6 with a snap-engagement, until the annular ridges of one of the two elements is brought in register with the annular recesses of the other, and they axially lock the driving element 13 in the holding body 4. The driving element 13 is at all events free to rotate in the holding body 4 around the longitudinal axis X-X.

[0033] Seal 21 remains interposed between the inner surface of the holding body 4 and the annular seat 20 of the driving element 13.

[0034] In the mounted configuration, tabs 16 are maintained in contact with the threaded body 12 by the inner wall of the holding body 4 so that mutual engagement of the threads is ensured. As a result, by rotating the operating portion 14, the lead nut-worm screw coupling between the lead-holder 7 and the driving element 13 causes translation along axis X-X of the lead-holder 7 and the lead 3 installed thereon.

[0035] Lead 3 is preferably mounted when assembly of container 2 has been completed, and it is inserted from the first opening 4a and locked in seat 9 through the interference with the axial ridges 10 and also taking advantage of the radial elasticity of the three arched walls of the cylindrical wall 8.

[0036] The elements are such sized that seat 9 for lead 3 can be brought as far as the first opening 4a, so that lead 3 can be drawn out even when it is very short.

[0037] In accordance with an alternative embodiment not shown, the externally threaded rod is integral with the operating portion 14 and therefore is part of the driving element 13, while the flexible tabs 16 are disposed on a tubular body integral with seat 9 and are therefore part of the lead-holder 7. The operating principle does not change.

[0038] Container 2 can also be provided with accessories. For instance, as shown in Figs. 1 and 2, a small sponge 24 and a pencil sharpener suitable for sharpening the lead 3 alone are inserted in a housing 26 formed in the operating portion 14. The pencil sharpener 25 is protected by a cap 27.

[0039] In the embodiments in which the small sponge and pencil sharpener are not present, housing 26 is closed by a suitable plug, not shown.

[0040] Preferably, irrespective of the specific embodiment, container 2 comprises a cap 28 disposed on the first end of the holding body 4 for protection of the lead tip or, if the lead tip is fully retracted, for preventing dust or other substances from penetrating through the first opening 4a.

[0041] The present invention reaches the intended purposes and achieves important advantages.

[0042] First of all, the present invention allows the container to be easily and quickly assembled, because all couplings are obtained through relative linear movements between the components and by snap-fit or friction-fit. In addition, all components of the container are inserted from one end alone of the holding body. Therefore, the assembly times can be reduced and use of less complicated machines and/or less qualified manpower can be provided and, as a result, the assembly costs are reduced.

[0043] Mounting of the lead is simple too, because the lead-holder made up of arched walls provided with axial ridges enables the lead to be locked by a mere axial movement.

[0044] The present invention possibly allows the final user to disassemble the container for internally cleaning it before replacing the lead with a new one.

[0045] The cap can be removed and put back while the lead tip lies within the holding body and therefore cannot be damaged.

[0046] In addition, the seal together with the cap make the user sure that the volatile substances of the cosmetic material are not dispersed and help in maintaining the cosmetic quality over time.

[0047] The axial ribs not only prevent the lead-holder from rotating, but also avoid the lead tossing about in the container so that it cannot be damaged during handling or transport, when carried in a handbag for example.

Claims

1. A container for propelling cosmetic pencils, comprising:

- a tubular holding body (4) having a first opening (4a) and a second opening (4b) opposite to the first one (4a) and presenting an inner surface;

- a lead-holder (7) axially movable in the tubular holding body (4) and having a seat (9) facing the first opening (4a) and designed to receive a lead (3) of cosmetic material; the rotation of the lead-holder (7) in the holding body (4) being locked;

- a driving element (13) movable in rotation in the holding body (4) and having an operating portion (14) protruding from the second opening (4b);

- means for converting the rotation motion of the operating portion (14) into the axial motion of the lead-holder (7);

wherein said converting means comprises a threaded body (12) being part of the lead-holder (7) or the driving element (13), and tabs (16) that are radially flexible preferably in an elastic manner and integral with the driving element (13) or the lead-holder (7) and having threaded portions (17) in engagement with the threaded body (12);
characterized in that the inner surface of the tubular holding body (4) has an axial portion (C) of reduced inner diameter placed close to the tabs (16) to keep the threaded portions (17) of said tabs (16) against said externally threaded rod (12) and ensure mutual engagement of the threads; said axial portion (C) having a conical shape diverging towards the second opening (4b).

2. A container as claimed in claim 1, wherein the driving element (13) is of tubular shape and comprises said tabs (16), and the threaded body (12) is an externally threaded rod being part of the lead-holder (7) and inserted in the driving element (13).

3. A container as claimed in claim 1, comprising axial ribs (5) internal to the tubular holding body (4) and engaged in grooves (11) formed in the lead-holder (7) to prevent rotation of the lead-holder (7) in the tubular holding body (4).

4. A container as claimed in the preceding claim, wherein the axial ribs (5) substantially extend as far as the first opening (4a) to axially guide the lead (3) and prevent radial displacements of same.

5. A container as claimed in the preceding claim, wherein the seat (9) for the lead (3) is delimited by a cylindrical wall (8); the grooves (11) being axial cuts formed in said cylindrical wall (8) and the axial ribs (5) being inserted in said axial cuts (11) and facing the inside of the seat (9).

6. A container as claimed in claim 1, comprising snap-engagement means interposed between the driving element (13) and the tubular holding body (4) and positioned close to the second opening (4b), to axially lock said driving element (13) relative to said tubular holding body (4).

7. A container as claimed in the preceding claim, wherein the snap-engagement means comprises first annular ridges (6) disposed on an inner surface of the tubular holding body (4) and second annular ridges (19) disposed on an outer surface of the driving element (13).

8. A container as claimed in claim 1, comprising an annular seal (21) interposed between the driving element (13) and the tubular holding body (4) and positioned at the second end (4b).

9. A propelling cosmetic pencil comprising a container (2) as claimed in one of claims 1 to 8 and a lead (3) of cosmetic material mounted in the lead-holder (7).

10. A process for assembling a container for propelling cosmetic pencils comprising the following steps:

i) providing a tubular holding body (4) having a first opening (4a) and a second opening (4b) opposite to the first one (4a) and presenting an inner surface;

ii) providing a lead-holder (7) having a seat (9) designed to receive a lead (3) of cosmetic material;

iii) providing a driving element (13) having an operating portion (14);

iv) causing axial sliding of a threaded body (12) integral with the lead-holder (7) or the driving element (13), on threaded portions (17) of radially flexible tabs (16) integral with the driving element (13) or the lead-holder (7);

v) axially inserting the driving element (13) and the lead-holder (7) through the second opening (4b) of the tubular holding body (4), the seat (9) of the lead-holder (7) facing the first opening (4a) and the operating portion (14) of the driving element (13) being maintained in a position protruding from the second opening (4b);

v') bringing said tabs (16) close to an axial portion (C) of the inner surface of the tubular holding body (4) having a reduced inner diameter, where the tabs (16) enter into contact with the inner surface which radially forces said tabs (16) towards the threaded body (12), thus ensuring mutual engagement of the threads; said axial portion (C) having a conical shape diverging towards the second opening (4b);

vi) locking rotation of the lead-holder (7) in the tubular holding body (4);

vii) axially locking the driving element (13) on the tubular holding body (4).

11. A process as claimed in claim 10, wherein step vi) is carried out through engagement, by axial movement, of axial ribs (5) internal to the tubular holding body (4) in axial grooves (11) formed in the lead-holder (7).

12. A process as claimed in claim 10, wherein step vii) is carried out through snap-engagement, by axial movement, of first annular ridges (6) internal to the tubular holding body (4) with second annular ridges (19) of the driving element (13).

Ansprüche

1. Behälter für kosmetische Drehstifte, umfassend:

- einen rohrförmigen Haltekörper (4) mit einer ersten Öffnung (4a) und einer zweiten Öffnung (b), die gegenüber der ersten Öffnung (4a) angeordnet ist, sowie einer Innenfläche;

- einen Minenhalter (7), der axial im rohrförmigen Haltekörper (4) verschiebbar ist und einen Sitz (9) gegenüber der ersten Öffnung (4a) aufweist und zur Aufnahme einer Mine (3) aus kosmetischem Material ausgelegt ist; wobei die Drehung des Minenhalters (7) im Haltekörper (4) verriegelt ist;

- ein Antriebselement (13), das drehbar im Haltekörper (4) beweglich ist und einen Betätigungsteil (14) aufweist, der aus der zweiten Öffnung (4b) heraustritt;

- Mittel zum Umwandeln der Drehbewegung des Betätigungsteils (14) in die axiale Bewegung des Minenhalters (7);

wobei diese Umwandlungsmittel einen Gewindekörper (12) umfassen, der ein Teil des Minenhalters (7) oder des Antriebselements (13) ist, sowie Laschen (16), die, vorzugsweise auf elastische Weise und zusammen mit dem Antriebselement (13) oder dem Minenhalter (7), radial flexibel sind und Gewindeteile (17) aufweisen, die mit dem Gewindekörper (12) verbunden sind;
dadurch gekennzeichnet, dass die Innenfläche des rohrförmigen Haltekörpers (4) einen axialen Teil (C) mit reduziertem Innendurchmesser aufweist, der nahe an den Laschen (16) angeordnet ist, um die Gewindeteile (17) dieser Laschen (16) gegen genannten mit einem Gewinde auf der Außenseite versehenen Stab (12) zu halten und die gegenseitige Verbindung der Gewinde zu gewährleisten; wobei dieser axialer Teil (C) eine Kegelform aufweist, die sich in Richtung der zweiten Öffnung (4b) verbreitert.

2. Behälter nach Anspruch 1, wobei das Antriebselement (13) rohrförmig ist und diese Laschen (16) umfasst und der Gewindekörper (12) ein auf der Außenseite mit Gewinde versehener Stab ist, der zum Minenhalter (7) gehört und in das Antriebselement (13) eingesetzt ist.

3. Behälter nach Anspruch 1, umfassend axiale Rippen (5) im rohrförmigen Haltekörper (4), die in Rillen (11) eingreifen, die im Minenhalter (7) ausgebildet sind, um die Drehung des Minenhalters (7) im rohrförmigen Haltekörper (4) zu vermeiden.

4. Behälter nach dem vorhergehenden Anspruch, wobei die axialen Rippen (5) im Wesentlichen so weit wie die erste Öffnung (4a) verlaufen, um die Mine (3) axial zu führen und deren radiale Verschiebung zu vermeiden.

5. Behälter nach dem vorhergehenden Anspruch, wobei der Sitz (9) für die Mine (3) von einer zylindrischen Wand (8) begrenzt ist; wobei die Rillen (11) aus axialen Einschnitten bestehen, die in dieser zylindrischer Wand (8) ausgebildet sind, und die axialen Rippen (5) sind in diese axiale Einschnitte (11) eingesetzt und zeigen zur Innenseite des Sitzes (9).

6. Behälter nach Anspruch 1, umfassend Schnappverbindungsmittel, die zwischen dem Antriebselement (13) und dem rohrförmigen Haltekörper (4) eingesetzt und nahe an der zweiten Öffnung (4b) angeordnet sind, um dieses Antriebselement (13) zu diesem rohrförmigen Haltekörper (4) axial zu verriegeln.

7. Behälter nach dem vorhergehenden Anspruch, wobei die Schnappverbindungsmittel erste ringförmige Erhöhungen (6) umfassen, die an einer Innenfläche des rohrförmigen Haltekörpers (4) angeordnet sind, sowie zweite ringförmige Erhöhungen (19), die an einer Außenfläche des Antriebselements (13) angeordnet sind.

8. Behälter nach Anspruch 1, umfassend einen Dichtring (21), der zwischen dem Antriebselement (13) und dem rohrförmigen Haltekörper (4) eingesetzt und am zweiten Ende (4b) positioniert ist.

9. Kosmetischer Drehstift, umfassend einen Behälter (2) nach einem der Ansprüche 1-8 und eine Mine (3) aus kosmetischem Material, die im Minenhalter (7) montiert ist.

10. Verfahren zum Zusammenbau eines Behälters für kosmetische Drehstifte, umfassend folgende Schritte:

i) zur Verfügung gestellt wird ein rohrförmiger Haltekörper (4) mit einer ersten Öffnung (4a) und einer zweiten Öffnung (4b), die der ersten (4a) gegenüberliegt, sowie einer Innenfläche;

ii) zur Verfügung gestellt wird ein Minenhalter (7) mit einem Sitz (9), der so ausgebildet ist, dass er eine Mine (3) aus kosmetischem Material aufnehmen kann;

iii) zur Verfügung gestellt wird ein Antriebselement (13), das einen Betätigungsteil (14) aufweist;

iv) verursacht wird die axiale Verschiebung eines Gewindekörpers (12) zusammen mit dem Minenhalter (7) oder dem Antriebselement (13) auf Gewindeteilen (17) radial flexibler Laschen (16), die mit dem Antriebselement (13) oder dem Minenhalter (7) verbunden sind;

v) das Antriebselement (13) und der Minenhalter (7) werden durch die zweite Öffnung (4b) des rohrförmigen Haltekörpers (4) axial eingefügt, wobei der Sitz (9) des Minenhalters (7) der ersten Öffnung (4a) gegenüber angeordnet ist und der Betätigungsteil (14) des Antriebselements (13) in einer Position beibehalten wird, in der er aus der zweiten Öffnung (4b) heraustritt;

v) diese Laschen (16) werden nahe an einen axialen Teil (C) der Innenfläche des rohrförmigen Haltekörpers (4) gebracht, der einen reduzierten Innendurchmesser aufweist, wobei die Laschen (16) mit der Innenfläche in Berührung kommen, die radial Kraft auf diese Laschen (16) in Richtung des Gewindekörpers (12) ausübt, sodass die gegenseitige Verbindung der Gewinde gewährleistet wird; dieser axialer Teil (C) weist eine Kegelform auf, die sich in Richtung der zweiten Öffnung (4b) verbreitert;

vi) die Drehung des Minenhalters (7) im rohrförmigen Haltekörper (4) ist verriegelt;

vii) das Antriebselement (13) ist auf dem rohrförmigen Haltekörper (4) axial verriegelt.

11. Verfahren nach Anspruch 10, wobei Schritt vi) anhand des Eingreifens axialer Rippen (5), die sich im rohrförmigen Körper (4) befinden, durch axiale Bewegung in axiale Rillen (11), die im Minenhalter (7) ausgebildet sind, durchgeführt wird.

12. Verfahren nach Anspruch 10, wobei Schritt vii) anhand der Schnappverbindung durch axiale Bewegung erster ringförmiger Erhöhungen (6), die sich im rohrförmigen Haltekörper (4) befinden, mit zweiten ringförmigen Erhöhungen (19) des Antriebselements (13) durchgeführt wird.

Revendications

1. Conteneur de propulsion de crayons cosmétiques comprenant :

- un corps de retenue tubulaire (4) ayant une première ouverture (4a) et une deuxième ouverture (4b) en face de la première (4a) et présentant une surface interne ;

- un portemine (7) déplaçable axialement dans le corps de retenue tubulaire (4) et présentant un siège (9) faisant face à la première ouverture (4a) et conçu pour recevoir une mine (3) de matière cosmétique ; la rotation du portemine (7) dans le corps de retenue (4) étant bloquée ;

- un élément d'entraînement (13) déplaçable en rotation dans le corps de retenue (4) et présentant une section fonctionnelle (14) dépassant de la deuxième ouverture (4b) ;

- des moyens pour convertir le mouvement de rotation de la section fonctionnelle (14) en mouvement axial du portemine(7) ;

dans lequel lesdits moyens de conversion comprennent un corps fileté (12) faisant partie du portemine (7) ou de l'élément d'entraînement (13), et des languettes (16) qui sont flexibles radialement, de préférence de manière élastique, et incorporées dans l'élément d'entraînement (13) ou dans le portemine (7) et présentant des sections filetées (17) s'engageant dans le corps fileté (12) ;
caractérisé en ce que la surface interne du corps de retenue tubulaire (4) a une section axiale (C) de petit diamètre intérieur près des languettes (16) pour maintenir les sections filetées (17) desdites languettes (16) contre la tige filetée extérieurement (12) et pour garantir l'engagement mutuel des filets ; ladite section axiale (C) ayant une forme conique s'élançant vers la deuxième ouverture (4b).

2. Conteneur selon la revendication 1, dans lequel l'élément d'entraînement (13) a une forme tubulaire et comprend lesdites languettes (16), et le corps fileté (12) est une tige filetée extérieurement faisant partie du portemine (7) et insérée dans l'élément d'entraînement (13).

3. Conteneur selon la revendication 1, comprenant des nervures axiales (5) à l'intérieur du corps de retenue tubulaire (4) et engagées dans les rainures (11) présentes sur le portemine (7) pour empêcher la rotation du portemine (7) dans le corps de retenue tubulaire (4).

4. Conteneur selon la revendication précédente, dans lequel les nervures axiales (5) s'étendent dans l'ensemble jusqu'à la première ouverture (4a) pour guider axialement la mine (3) et pour empêcher ses déplacements radiaux.

5. Conteneur selon la revendication précédente, dans lequel le siège (9) de la mine (3) est délimité par une paroi cylindrique (8) ; les rainures (11) étant des incisions axiales dans ladite paroi cylindrique (8) et les nervures axiales (5) étant insérées dans lesdites incisions axiales (11) et faisant face à la section intérieure du siège (9).

6. Conteneur selon la revendication 1, comprenant des moyens d'encliquetage placés entre l'élément d'entraînement (13) et le corps de retenue tubulaire (4) et situés près de la deuxième ouverture (4b), pour bloquer axialement ledit élément d'entraînement (13) par rapport audit corps de retenue tubulaire (4).

7. Conteneur selon la revendication précédente, dans lequel les moyens d'encliquetage comprennent des premières crêtes annulaires (6) disposées sur une surface interne du corps de retenue tubulaire (4) et des deuxièmes crêtes annulaires (19) disposées sur une surface externe de l'élément d'entraînement (13).

8. Conteneur selon la revendication 1, comprenant un joint annulaire (21) intercalé entre l'élément d'entraînement (13) et le corps de retenue tubulaire (4) et positionné sur la deuxième extrémité (4b).

9. Crayon cosmétique de propulsion comprenant un conteneur (2) selon l'une des revendications de 1 à 8, et une mine (3) de matière cosmétique montée dans le portemine (7).

10. Procédé d'assemblage d'un conteneur de propulsion des crayons cosmétiques comprenant les étapes suivantes :

i) fournir un corps de retenue tubulaire (4) ayant une première ouverture (4a) et une deuxième ouverture (4b) en face de la première (4a) et présentant une surface interne ;

ii) fournir un portemine (7) présentant un siège (9) conçu pour recevoir une mine (3) de matière cosmétique ;

iii) fournir un élément d'entraînement (13) présentant une section fonctionnelle (14) ;

iv) provoquer un glissement axial d'un corps fileté (12) incorporé dans le portemine (7) ou dans l'élément d'entraînement (13), sur les sections filetées (17) des languettes flexibles radialement (16), incorporées dans l'élément d'entraînement (13) ou dans le portemine (7) ;

v) insérer axialement l'élément d'entraînement (13) et le portemine (7) dans la deuxième ouverture (4b) du corps de retenue tubulaire (4), le siège (9) du portemine (7) faisant face à la première ouverture (4a) et la section fonctionnelle (14) de l'élément d'entraînement (13) étant maintenue en saillie de la deuxième ouverture (4b) ;

v') amener lesdites languettes (16) près d'une section axiale (C) de la surface interne du corps de retenue tubulaire (4) ayant un petit diamètre intérieur, où les languettes (16) entrent en contact avec la surface interne, qui pousse radialement lesdites languettes (16) vers le corps fileté (12), garantissant l'engagement mutuel des filets ; ladite section axiale (C) ayant une forme conique s'élançant vers la deuxième ouverture (4b) ;

vi) bloquer la rotation du portemine (7) dans le corps de retenue tubulaire (4) ;

vii) bloquer axialement l'élément d'entraînement (13) sur le corps de retenue tubulaire (4).

11. Procédé selon la revendication 10, dans lequel l'étape vi) est réalisée par engagement, suite à un mouvement axial, des nervures axiales (5) situées à l'intérieur du corps de retenue tubulaire (4) dans des rainures axiales (11) faites dans le portemine (7).

12. Procédé selon la revendication 10, dans lequel l'étape vii) est réalisée par encliquetage, suite à un mouvement axial, des premières crêtes annulaires (6), situées à l'intérieur du corps de retenue tubulaire (4), dans des deuxièmes crêtes annulaires (19) faites dans l'élément d'entraînement (13).

Drawing