Cartridge for a cosmetic pencil

Abstract

Cartridge (1) for a cosmetic pencil with a cartridge body (3), with a cosmetic lead (4) and with a lead adapter (5) which drives, preferably holds, the end of the cosmetic lead (4), wherein the cosmetic lead (4) can be pushed out of the cartridge body (3) by means of the lead adapter (5), characterized in that a driver sleeve (6) is rotatably mounted in the cartridge body (3), which forms an external thread (6a) on which a threaded nut (7) can move translationally between the driver sleeve (6) and the cartridge body (3), wherein the threaded nut (7) drives the lead adapter (5) when the driver sleeve (6) rotates in the cartridge body (3).

Description

The invention relates to a cartridge for a cosmetic stick according to the preamble of claim 1.BACKGROUND ARTKnown cosmetic stick refill systems use cosmetic mines (or even: mines) that are movably supported in cartridges. For this purpose, the bodies of the cartridges (also: cartridge bodies) regularly have an internal thread. By means of this internal thread, the mines can be extended and usually also retracted again by turning. The outer side of the cartridge bodies is generally not to be designed to be optically desirable or is only to be designed to be optically desirable with great effort. Because of the internal thread, the local wall thickness of the cartridge body fluctuates greatly and thus also the required cooling time. This prevents an optically perfect decorative surface from forming almost automatically during injection molding.Due to this, the cartridges or the cartridge bodies in the previously known refill systems are either expensively after-treated (upgraded) on the outside or the refill pen forms a jacket tube in which the cartridge-at least almost-completely disappears.The former is expensive. The latter is not without any unlimited acceptance, since it becomes more difficult at first glance to identify how the cartridge is to be mounted correctly and because with time dirt can accumulate on the inner surface of the jacket tube due to mine residue, which dirt can hardly be removed.UNDERLYING OBJECTThe aim is to find a fill solution for cosmetic sticks which is as simple as possible to operate and which, even in the long term, does not entail any risk of unpleasant soiling.THE SOLUTION ACCORDING TO THE INVENTIONThe underlying problem is solved according to the invention by a cartridge having the features of claim 1.For this purpose, a cartridge for a cosmetic stick is proposed. This cartridge is used in the narrower sense for "loading" a cosmetic stick and can at least largely completely make up a cosmetic stick in the broader sense. Preferably, for the construction of a cosmetic stick, in addition to the cartridge, only a rotatable handpiece is required at the end of the cartridge facing away from the lead tip for actuating and holding the cosmetic stick and preferably a cap for protecting the cosmetic lead.The cartridge preferably comprises a cartridge body and a cosmetic lead and is provided with a lead adapter driving the end of the cosmetic lead facing away from the application tip, preferably holding the cosmetic lead. The cartridge body preferably forms at least the predominant part of the cartridge housing which accommodates the rest of the cartridge components. In this case, the cosmetic lead can be pushed out of the cartridge body by means of the lead adapter.The cartridge according to the invention is characterized in that a driver sleeve is rotatably mounted in the cartridge body, said driver sleeve forming an external thread on which a threaded nut can move translationally and is located between the driver sleeve and the cartridge body, wherein the threaded nut drives the mine adapter when the driver sleeve rotates in the cartridge body.According to the invention, it is possible to make the circumferential wall of the cartridge body with a much more uniform wall thickness than previously. Thus, already during injection molding, it can be given a very high quality outer jacket surface which does not have to be hidden in a jacket tube of the refillable pin, but rather is permanently suitable as a pleasing visible surface and is then regularly renewed from time to time when the next cartridge is used, which is also very satisfactory in terms of hygiene.OPTIONAL DEVELOPMENT POSSIBILITIESA preferred embodiment of the cartridge consists in that the threaded nut can rotate relative to the cartridge body not at all or not more than insignificantly. "Not more than insignificantly" means, in the sense of the invention, that the threaded nut can rotate in both directions by at most 10°, preferably even at most 5°, before further rotation is blocked. For this purpose, the inner lateral surface of the cartridge body preferably has at least locally a flattening which interacts with a complementary flattening on the outer lateral surface of the threaded nut. Ideally, said inner and outer lateral surfaces are mutually interacting polygonal surfaces. The cross section of the inner lateral surface of the cartridge body and the outer lateral surface of the threaded nut is thus preferably polygonal. The edges of the polygonal cross section thus extend in three dimensions to polygonal surfaces which then interact with one another. Such a configuration permits an almost unchanged wall thickness, since only minimal flattenings are necessary in the case of a polygon.In addition, it is particularly preferred if the driver sleeve is mounted at its tip and at its end in the cartridge body and forms an annular gap therebetween between it and the cartridge body. The driver sleeve is thus mounted either directly or indirectly in the cartridge body at its tip and its end. This results in a defined mounting of the driver sleeve in the cartridge body, wherein the annular gap resulting in between can be used to accommodate the threaded nut.In addition, it is particularly preferred if the driver sleeve is slotted over a predominant and preferably substantially entire length, preferably with at least one axial slot. This slot is preferably provided at least in the region of the external thread of the driver sleeve. This axial slot preferably runs axially along the lateral surface of the driver sleeve and is preferably unslotted in the region of the end facing away from the mine tip. The slot is required to accommodate the mine adapter, wherein the unslotted end ideally forms a stop for the mine adapter and / or the threaded nut, which stop prevents the mine adapter from turning back further.Furthermore, it is particularly preferred if the mine adapter has a first actuator which projects through said slot of the driver sleeve into the region of the threaded nut. The first actuator thus preferably projects radially outwards into the annular gap between the driver sleeve and the cartridge body. Thus, the threaded nut can push or push the lead adapter forward in such a way that the lead is extended from the cartridge body, wherein this actuator is preferably rigid.Furthermore, it is particularly preferred if the mine adapter has a second actuator which projects through said slot of the driver sleeve into the region of the threaded nut and which is designed such that it can be passed over by the threaded nut in order to latch with the threaded nut. The second actuator is thus designed to be correspondingly resilient in one direction (only) so that the threaded nut presses the second actuator downward during the initial mounting and thus travels over and, after travel over, latches between the first and second actuators and is captured there. Thus, when the threaded nut moves accordingly, it can pull the cosmetic lead back into the cartridge body. Thus, a mechanism can be provided in a simple manner which can both extend and retract the mine.Furthermore, it is particularly preferred if the cosmetic lead, in the unused, not yet shortened state, is predominantly spaced apart from the inner surface of the driver sleeve in the direction of its longitudinal axis.In addition, it is particularly preferred if the cartridge body forms a centering bearing for the driver sleeve at its end facing the mine tip, preferably in that it tapers, ideally in an inwardly inclined manner. Thus, a centering for the driver sleeve in the cartridge body can be created in a simple manner.In addition, it is particularly preferred if the driver sleeve narrows at its end facing the lead tip and thus forms a preferably centering-acting slide bearing for the cosmetic lead. Thus, a centering and a guide for the cosmetic lead in the driver sleeve can be created in a simple manner. The sliding surfaces of the sliding bearing are preferably cylindrical, among other things also in order to be able to compensate for a length tolerance.Furthermore, it is particularly preferred if the driver sleeve and the cartridge body engage with each other at their ends facing the mine tip in such a way that the cartridge body presses the slot of the driver sleeve locally or at least blocks it, i.e. at least prevents it from widening during operation. Thus, although the slot can be used for inserting the lead adapter, the slot again does not interfere with the operation of the cartridge.Furthermore, it is particularly preferred if the slot in the driver sleeve becomes narrower in the circumferential direction at the end facing the lead tip than in the remainder, preferably in the entire remainder of the lead sleeve, and ideally is so narrow that the edges of the slot come to rest against one another and can thus limit the pressing that the driver sleeve can exert on the cosmetic lead in this region.In addition, it is particularly preferred if the driver sleeve forms, at its end facing away from the mine tip, a coupling section, preferably designed as a toothed or ribbed wheel, for positively coupling a rotary mechanism of a handpiece by sliding on in the direction of the longitudinal axis of the cartridge. Thus, a handpiece can be mounted on the cartridge in a simple manner, which handpiece can be used on the one hand as a handle and on the other hand as an actuating element of the rotary mechanism of the cartridge for pushing out and pulling in the cosmetic lead. In this way, the handpiece can also be easily disassembled again, for example, in order to replace the cartridge.In addition, it is particularly preferred if the driver sleeve has, at its end facing away from the mine tip, a latching means which is designed such that the driver sleeve can be latched to the cartridge body in such a way that it is immobilized in the cartridge on the one hand in the direction of the longitudinal axis of the cartridge and remains rotatable relative to the cartridge on the other hand. For this purpose, the cartridge body preferably has a corresponding projection on the inside, preferably a circumferential projection, with which the latching means latches. Thus, an axial slipping out of the driver sleeve from the cartridge body can be prevented in a simple manner.Furthermore, it is particularly preferred if the external thread of the driver sleeve is interrupted not only by the slot but also by at least one additional groove which does not pass radially through the driver sleeve. This groove preferably runs axially on the outer circumferential surface of the driver sleeve. In this groove, any contaminants that may have advanced into the region of the thread can be deposited without significantly impairing the ease of running of the thread.Further modes of operation, advantages and possible embodiments are evident from the figure-based description of the exemplary embodiment.FIGURE LISTFIG. 1 shows a cartridge according to the invention in side view.FIG. 2 shows, analogously to FIG. 1, the cartridge according to the invention in a sectioned side view.FIG. 3 shows the cartridge according to the invention from FIG. 1 in a three-dimensional view, wherein the individual components are partially transparent.FIG. 4 shows a driver sleeve in a three-dimensional view.FIG. 5 shows the driver sleeve from FIG. 4 in a sectioned side view.FIG. 6 shows the driver sleeve from FIG. 4 in a plan view.FIG. 7 shows the driver sleeve from FIG. 4 in a rear view.FIG. 8 shows a mine adapter in a three-dimensional view.FIG. 9 shows the mine adapter from FIG. 8 in a different three-dimensional view compared to FIG. 8.FIG. 10 shows the mine adapter from FIG. 8 in a sectional side view.FIG. 11 shows a threaded nut in a three-dimensional view.FIG. 12 shows the threaded nut from FIG. 11 in a front view.PREFERRED EMBODIMENTFIGS. 1 to 12 show a preferred exemplary embodiment of the cartridge 1 for a cosmetic stick and its components.The cartridge 1 comprises a cartridge body 3, a cosmetic lead 4, a lead adapter 5, a driver sleeve 6 and a threaded nut 7 (see FIG. 2 ).The cosmetic lead 4 is attached, preferably inserted, directly in the lead adapter 5. The lead adapter 5 preferably holds the cosmetic lead 4 and also drives the cosmetic lead 4 by moving it axially in and out when the driver sleeve 6 rotates.For this purpose, the driver sleeve 6 is rotatably mounted and forms an external thread 6 a, on which a threaded nut 7 can then move translationally, wherein the threaded nut 7 drives the mine adapter 5 when the driver sleeve 6 rotates in the cartridge body 3.In order to ensure the function of the cartridge 1 or of the cosmetic stick, the cartridge body 3 and the threaded nut 7 must be able to rotate relative to one another only insignificantly, if at all. Thus, the threaded nut 7 can move together with the mine adapter 5 in translation on the external thread 6 aof the driver sleeve 6.For this purpose, the inner lateral surface of the cartridge body 3 preferably has at least locally a flattening 3 awhich interacts with a complementary flattening 7 aon the outer lateral surface of the threaded nut 7. In the exemplary embodiment shown, the cross section of the outer lateral surface of the threaded nut 7 is therefore polygonal (see FIG. 12 ) and correspondingly the cross section of the inner lateral surface of the cartridge body 3 is likewise polygonal. FIG. 3 shows the individual flattened portions 3 aof this polygonal cross section well, wherein individual paths are thereby formed in the cartridge body 3 along the partial length of the cartridge body 3. These tracks receive this threaded nut 7 during the initial mounting of the threaded nut 7 and allow it to slide from the tip of the cartridge body 3 to its end. At the end of the cartridge body 3, these tracks preferably run in a triangular shape. This facilitates insertion during assembly and provides a natural stop of the threaded nut 7.The driver sleeve 6 is preferably mounted at its tip and at its end in the cartridge body 3 and an annular gap 8 is formed between these two mounting points between the driver sleeve 6 and the cartridge body 3. This annular gap 8 is used for the translatory movement of the mine adapter 5 and the threaded nut 7. The driver sleeve 6 is also slit over its predominant length, preferably with an axial slit 6 b(see FIG. 4 ). The mine adapter 5 or its actuator 5 aand 5 bis inserted into this slot 6 bwhen the cartridge 1 is mounted. In order to allow these actuators 5 aand 5 bto slide into the slot 6 b, the driver sleeve 6 has a preferably V-shaped insertion bevel 6 don its end facing the mine tip 4 a(see FIG. 6 ).The first actuator 5 aand the second actuator 5 bprotrude radially outwards through the said slot 6 bof the driver sleeve 6 into the region of the threaded nut 7 in the assembled state. This is important when the cartridge 1 is mounted for the first time. Here, the threaded nut 7 presses this second actuator 5 btowards the bottom and thus latches between the two actuators 5 aand 5 b, as a result of which the threaded nut 7 can be carried along axially translationally on both sides by the mine adapter 5. For this purpose, the threaded nut 7 abuts both or an actuator 5 aand 5 b, at least when the cosmetic lead 4 is extended and / or retracted.The cartridge body 3 has at its end facing the mine tip 4 aa centering bearing 3 bfor the driver sleeve 6, preferably in that it tapers, ideally in an inwardly inclined manner (see FIG. 2 ).The driver sleeve 6 in turn forms a centring sliding bearing for the cosmetic lead 4 at its end facing the lead tip 4 a, in that it narrows there (see FIG. 5 ).The driver sleeve 6 also has, at its end facing away from the mine tip 4 a, a latching means 10, preferably in the form of a circumferential groove on its outer circumferential surface and a corresponding circumferential protrusion on the inner circumferential surface of the cartridge body 3. At this end, the driver sleeve 6 is preferably also still pressed into the cartridge body 3; in the exemplary embodiment shown, it is spread and preferably also air-sealed by a v-shaped outer contour in this region, which is inserted in a wedge-shaped manner and, as a result, however, deforms. A rotational movement of the driver sleeve must not be completely blocked.The external thread 6 aof the driver sleeve 6 is preferably interrupted not only by the slot 6 b, but also by at least one additional groove 6 c, which does not pass radially through the driver sleeve 6 and in which dirt and / or abraded material is preferably collected (see FIG. 6 ).The embodiment shown in the figures is, as mentioned, a cartridge 1 for a cosmetic stick. This cosmetic stick is not shown in the figures, but has at least one additional handpiece. The cartridge body 3 preferably has on its outer circumferential surface at least one coupling section 12, preferably in the form of at least one projection 12, which latches with a complementary counter-latching means of the handpiece and is designed such that the latching takes place by itself, i.e. without particular attention and without particular causes, as soon as the cartridge 1 and the handpiece are pushed into one another along the longitudinal axis L of the cartridge 1, wherein the latching is preferably designed such that it can be pulled apart again manually in the direction of the longitudinal axis L.FIG. 7 also shows the coupling section 9 of the driver sleeve 6, which it has on its end facing away from the mine tip 4 a. This coupling section 9 is preferably designed as a toothed wheel or ribbed wheel in order to enable a positive coupling of a rotary mechanism of a handpiece by sliding on in the direction of the longitudinal axis L of the cartridge 1, in the sense of an axial coupling.For this purpose, the handpiece has a corresponding receptacle. When the handpiece is rotated, the coupling section 9 and thus the driver sleeve 6 thus rotates, and the above-described mechanism for retracting and extending the cosmetic lead 4 is actuated.The cartridge 1 is also preferably designed such that only the driver sleeve 6 is fixed by the coupling section 12. The cartridge body 3 also preferably has a flattened portion 3 con the outside (see FIG. 1 ), which permits a more rapid ventilation of the free space which is formed when the cartridge 1 is pulled out.The cartridge body 3 also preferably has a latching means for latching on a closure cap protecting the lead tip 4 a. This is not shown in the figures, but is preferably likewise designed as a circumferential projection on the outer lateral surface of the cartridge body 3.LIST OF REFERENCE CHARACTERS1 Cartridge 2 does not assign 3 cartridge body 3 ainside flattening 3 bcentral bearing 3 coutside flattening 4 cosmetic lead 4 a lead tip 5 lead adapter 5 afirst actuator 5 bsecond actuator 6 driver sleeve 6 aouter thread 6 bslot 6 cnut 6 dinsertion slope 7 threaded nut 7 a flattening 8 annular gap 9 coupling section 10 latching means 11 slide bearing 12 coupling section L longitudinal axis of the cartridge

Claims

Cartridge (1) for a cosmetic stick having a cartridge body (3), having a cosmetic lead (4) and having a lead adapter (5) which drives, preferably holds, the end of the cosmetic lead (4), wherein the cosmetic lead (4) can be pushed out of the cartridge body (3) by means of the lead adapter (5), characterized in that a driver sleeve (6) is rotatably mounted in the cartridge body (3), said driver sleeve forming an external thread (6a), on which a threaded nut (7) can move translationally between the driver sleeve (6) and the cartridge body (3), wherein the threaded nut (7) drives the lead adapter (5) when the driver sleeve (6) rotates in the cartridge body (3).Cartridge (1) according to claim 1, characterized in that the cartridge body (3) interacts with the threaded nut (7) in such a way that the threaded nut (7) cannot rotate relative to the cartridge body (3), for which purpose the inner lateral surface of the cartridge body (3) preferably has at least locally a flattening (3a) which interacts with a complementary flattening (7a) on the outer lateral surface of the threaded nut (7), and ideally said inner and outer lateral surfaces are polygonal surfaces interacting with each other.Cartridge (1) according to one of the preceding claims, characterized in that the driver sleeve (6) is mounted at its tip and at its end in the cartridge body (3) and forms an annular gap (8) between it and the cartridge body (3) therebetween.Cartridge (1) according to one of the preceding claims, characterized in that the driver sleeve (6) is slotted over a predominant and preferably substantially entire length, preferably with at least one axial slot (6b).Cartridge (1) according to the immediately preceding claim, characterized in that the mine adapter (5) has a first actuator (5a) which projects through said slot (6b) of the driver sleeve (6) into the region of the threaded nut (7).Cartridge (1) according to one of the preceding claims, characterized in that the mine adapter (5) has a second actuator (5b), which projects through said slot (6b) of the driver sleeve (6) into the region of the threaded nut (7) and which is designed such that it can be traversed by the threaded nut (7) in order to latch with the threaded nut (7).Cartridge (1) according to one of the preceding claims, characterized in that the cosmetic lead (4) is spaced apart from the inner surface of the driver sleeve (6) over a predominant length in the direction of its longitudinal axis.Cartridge (1) according to one of the preceding claims, characterized in that the cartridge body (3) forms a centring bearing (3b) for the driver sleeve (6) at its end facing the mine tip (4a), preferably in that it tapers, ideally in an inwardly inclined manner.Cartridge (1) according to one of the preceding claims, characterized in that the driver sleeve (6) narrows at its end facing the lead tip (4a) and thus forms a preferably centring slide bearing (11) for the cosmetic lead (4).Cartridge (1) according to one of the preceding claims, characterized in that the driver sleeve (6) and the cartridge body (3) engage one into the other at their ends facing the mine tip (4a) in such a way that the cartridge body (3) presses or at least blocks the slot (6b) of the driver sleeve (6) locally.Cartridge (1) according to the immediately preceding claim, characterized in that the slot (6b) in the driver sleeve (6) becomes narrower in the circumferential direction at the end facing the lead tip (4a), and ideally is so narrow that the edges of the slot (6b) come to bear against one another and can thus limit the pressing which the driver sleeve (6) can exert on the cosmetic lead (4) in this region.Cartridge (1) according to one of the preceding claims, characterized in that the driver sleeve (6) forms, at its end facing away from the mine tip (4a), a coupling section (9), preferably designed as a toothed or ribbed wheel, for positively coupling a rotary mechanism of a handpiece by sliding on in the direction of the longitudinal axis (L) of the cartridge (1).Cartridge (1) according to one of the preceding claims, characterized in that the driver sleeve (6) has, at its end facing away from the mine tip (4a), a latching means (10) which is designed such that the driver sleeve (6) can be latched to the cartridge body (3) in such a way that it is immobilized in the cartridge (1) on the one hand in the direction of the longitudinal axis (L) of the cartridge and remains rotatable relative to the cartridge (1) on the other hand.Cartridge (1) according to one of the preceding claims, characterized in that the external thread (6a) of the driver sleeve (6) is interrupted not only by the slot (6b) but also by at least one additional groove (6c) which does not pass radially through the driver sleeve (6).Cosmetic stick with a handpiece and a cartridge (1) according to one of the preceding claims, characterized in that the cartridge body (3) preferably has at least one coupling section (12) on its outer circumferential surface, which engages with a complementary counter-engagement means of the handpiece and is designed such that the engagement takes place by itself as soon as the cartridge (1) and the handpiece are pushed into one another along the longitudinal axis (L) of the cartridge (1), wherein the engagement is preferably designed such that it can be pulled apart again manually in the direction of the longitudinal axis (L).Cosmetic stick according to the immediately preceding claim, characterized in that the cartridge (1) is designed in such a way that, when the cosmetic stick is used, only the driver sleeve (6) is fixed in a rotational manner by the coupling section (9).Cosmetic stick according to one of the two immediately preceding claims, characterized in that the cartridge body (3) has a latching means for latching on a closure cap protecting the lead tip (4a).

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