JP2006513740A - Lipstick mechanism or similar where braking is provided by the relief section of the inner sleeve - Google Patents

Abstract

The invention relates to a lipstick mechanism of the type comprising an inner tubular sleeve (1) intended to rotate inside the outer tubular sleeve (3) or the like. The sleeve is provided with two longitudinal holes (10, 11) and two helical holes (5) used to guide the stud (6) during movement, the stud Belongs to the stick holder (2) which is arranged in the inner tubular sleeve (1). Furthermore, this inner sleeve passes through a braking relief section (21), which is designed to extend telescopically against an essentially cylindrical bearing surface (7) connected to the outer sleeve (3). A cylindrical base (12) is provided. The present invention provides a raised area in which the bearing surface (7) connected to the outer sleeve is telescopically deformable and the braking relief section (21) is submerged in the bearing surface (7). Characterized by the provision.

Description

  The present invention relates to a lipstick mechanism or the like of the type comprising an inner tubular duct intended to enter into an outer tubular duct, which duct is a stud on a stick-holder cup arranged in the inner tubular duct With two longitudinal slots and two helical slots to guide the movement of the inner duct, in the cylindrical base to cause a gentle movement between the two ducts and even a rotational movement A restriction relief intended to extend telescopically on a cylindrical surface connected to an external duct.

  The applicant proposes in EP 0 439 381 a mechanism equipped with such a restriction device, in which the relief is from a telescopic lug formed by a ring attached to the base of the duct. Constructed or formed directly on the base of the duct. These lugs or tangs are arranged parallel to the axis of the duct and are separated radially outwardly in their base to travel on the inner wall of the outer duct or on the wall connected to this duct (external There may be a decorative sheath surrounding the duct). This mechanism provides a limit to obtain complete satisfaction. However, this superior quality has a manufacturing cost that can be too expensive for mass production where quality is less demanding.

  In order to reduce manufacturing costs by a single injection molding operation, a restrictive tongue is generated directly on the wall of the cylindrical base; a restrictive release is then placed on the part of the wall, which may or may not be thin, It constitutes a shoe or button formed in the wall of a cylindrical base and is required to be cut (by molding) to form a tongue. This is shown, for example, in various forms of tongues by US Pat. Nos. 5,186,560, 5,186,561 or 5,324,126.

  However, the quality of these mechanisms is too mediocre, even for mass production.

  The object of the present invention is to propose a novel limiting mechanism which achieves a quality equivalent to that proposed in European patent EP 0 439 381, but is not very expensive.

  This object is achieved according to the invention by a lipstick mechanism of the type comprising an internal tubular duct intended to enter into an external tubular duct, which is a stick arranged in the internal tubular duct. -With two longitudinal slots and two helical slots to guide the movement of the stud on the holder cup, this inner duct telescopic on a substantially cylindrical surface connected to the outer duct This lipstick mechanism has a cylindrical base with a restriction relief intended to be freely advanced, the surface connected to the external duct is elastically deformable, and the restriction relief is submerged in the surface Characterized by points composed of raised areas. By raised area is meant the area where the distance to the axis of rotation is greater than the external radius of the part without the relief of the cylindrical base of the internal duct; this height is the external appearance of the outer sheath surface. Still higher than the radius, this results in the above settling, which, for its original position, is regarded as a local deformation of the wall, not just the settling of the wall itself. Therefore, the restriction man is not given by the restriction lug, but by the elasticity of the deformation of the wall constituting the surface. This simplifies manufacturing and eliminates the parts of the prior art mechanism (ie the collar of the elastic lug).

  In a particularly advantageous manner, the restriction relief is associated with a substantially angular sector of the internal duct (or surface) to provide a fairly wide surface, allowing the pressure required for restriction to be reduced, It makes it possible to limit sedimentation to very low values. The relief is preferably in the shape of a cylindrical raised region, and its elongating sector is between 70 ° and 100 °, preferably between 80 ° and 90 °.

  According to one embodiment, the restriction relief consists of a simple off-centring of the cylindrical part of the internal duct at the restriction surface.

  When the wall that makes up the surface is covered with a cylindrical rigid envelope, such as the sheath of this mechanism, this wall is externally related to the space that allows its deformation, and the base is removed by decimation of the envelope Alternatively, it may be formed at least in part by thinning out the walls that make up the surface, the latter potentially being partially compatible with the requirements for making the wall deformable. Of course, it is also possible at this level to have no cylindrical envelope at all, for example by creating a provision for producing a shorter sheath.

  This mechanism is advantageously generated from one or more injected plastic materials. The internal duct according to the invention can be manufactured from many plastic materials conventionally used for this type of injection, according to quality and reduced cost price. The required application is also considered: it is known that specific materials other than others are recommended according to the specific formulation used for the lipstick and the solvent released therefrom. For example, certain solvents react with styrene, such as polystyrene, others produce polypropylene swelling that is detrimental to maintaining the limited quality of the mechanism of the present invention over time. This is because these qualities are essentially related to a relatively accurate clearance between all components. For an outer sheath with a deformable surface, it is advantageous to use, for example, polyacetal resin (polyoxymethylene POM). This resin is particularly advantageous because of its good shape memory and its resistance to cracking; in addition, polystyrene-polyacetal pairs or polypropylene-polyacetal pairs provide good friction quality.

  To make this mechanism, all parts that are assembled with minimal clearance (each of which is a relief part of a duct) are advantageously constructed and undetectable by the user, but the parts “drift” A mild friction is provided by the relief part of the duct according to the present invention, which provides only very little overall friction resisting and can be perceived. In order to ensure this minimum clearance between the parts, in particular between the inner and outer ducts, apart from the restriction relief, the inner and outer ducts are preferably placed towards their respective ends. It is particularly advantageous to have contacts limited to the narrow abutment area to be drilled. In fact, the inner duct is designed to be completely cylindrical and the outer sheath is not visible to the eye, but is designed to be slightly conical enough to facilitate good removal from the mold. The inner duct has a completely coaxial holding of the outer duct to the abutment on its top part, firstly on the top part of the inner duct and secondly on the surface of the bottom part of the inner duct. Provide a very thin cylindrical surface (about 1/10 mm) sufficient to ensure. The abutment in these two separate narrow areas significantly reduces the friction of the outer duct to the inner duct. The main part of the friction is due to the cam formed by the limiting relief according to the invention. This relief can advantageously be provided to itself have a certain conicity according to the required torque; this allows this conicity to adapt the limiting surface Thus, pressure is exerted on the required application.

  Other advantages and features of the present invention will become apparent upon reading the following description with reference to the accompanying drawings.

  The lipstick mechanism conventionally comprises a plastic cylindrical inner duct 1 that receives a lipstick-holder cup 2 (FIG. 5). It is also made of plastic, is substantially cylindrical and is itself covered with a decorative sheath or body 4, generally an external duct or helix 3 made of metal or metallized plastic To slip. These elements are mounted concentrically in symmetry of rotation about axis XX.

  The inner duct 1 comprises two longitudinal slots 10 and 11, while the outer duct 3 comprises two helical slots 5 (its substantially It can be the only simple groove on the inner surface of the cylinder. Within this spiral slot 5, the stud 6 of the cup 2 engages the height of this region (and hence the position of the cup 2) depending on the relative rotation of the ducts 1 and 3.

  The outer duct 3 comprises a substantially cylindrical region 7 at its bottom, which region of the inner duct 1 to cooperate with the inner duct to produce a gentle friction device as described below. It is intended to face the annular base 12.

  The inner duct 1 comprises three regions each from top to bottom: a main region 13 in which slots 10, 11 are formed; then an annular base region 12 in which the eccentricity limiting device of the invention is formed; and finally A cap 14 that may comprise a longitudinal groove or sled 19 on a portion (preferably the bottom) of its outer cylindrical surface. Regions 13 and 12 and 12 and 14 can be separated from shoulders 17 and 18.

  All these elements are known per se and do not require any further explanation.

  The annular base region 12 is entirely composed of a substantially cylindrical wall, and its inner surface is continuous with the inner surface of region 13 or region 14 (see FIG. 2). The outer surface 20 of the wall 12 comprises a gentle restriction relief 21 intended to cooperate with the inner wall 22 of the bottom part 7 of the duct 3 on a large angular sector.

  This gentle relief 21 is generally composed of a cylindrical surface having a generatrix parallel to the axis XX. Shown schematically in FIG. 6 is a local protrusion of section A (similar to a cam) provided on the cylindrical outer surface 20 of the wall 12 in the center of XX. It can be the case. FIG. 7 schematically shows a case where the cylindrical outer surfaces 20, 21 are completely off-centered so that they are in the center of the adjacent axis 00 and parallel to XX. It can be. Off-centering d between the two axes (eg 0.2 mm) constitutes a relief in which part 21 has approximately the same value d at its maximum level with respect to the theoretical cylindrical surface 20 ′ centered on XX. On the other hand, the opposing parts of the outer surface 20 mean that they are recessed by the same clearance d with respect to the theoretical surface 20 ′. In both cases, a relief 21 with a maximum protrusion h with respect to the theoretical cylinder is obtained. This height h is equal to the off-centering d in the case of FIG.

  This part of the relief 21 may or may not be due to a net relief or off-centering, and therefore the wall 7 above the sector A selected or distributed according to the invention to be sufficiently wide. Proceed on the surface 22. This angular sector A is preferably between 70 ° and 100 °, more preferably between 80 ° and 90 °.

  The walls 7 are designed so that, due to their dimensions and structural characteristics, the relief parts 21 can be deformed as they pass through: a given plastic material has a certain flexibility and benefits from this flexibility. For example, in the case of a polyacetal resin, a thickness of about 0.5 mm can be envisaged. In order to allow this outward deformation due to the sinking of the relief 21, the wall 7 is essentially free from the surface of the body 4 by a sufficient space 25 which is slightly larger than the largest protrusion h of the relief 21. It is away from the shaving wall 23. This space 25, as shown in FIG. 2, can be achieved by thinning the inside of the body 4 at its bottom part (or by increasing the mean diameter of the body by grooving without thinning of the body), or 3 can be obtained either by external thinning of the wall 7 itself or by a combination of these possibilities.

  FIG. 4 illustrates the deformation that occurs in the wall 7 of the helix 3 and the wall 12 of the internal duct. The body 4 is rigid and leaves the cylinder at the center of XX. The wall 12 of the inner sheath 1 at the center of 00 (this is the case when the relief 21 is formed by off-centering) is pushed by its part 21 against the opposite surface 22 of the wall 7, where In principle, the cylindrical shape in the center of XX then deforms into an oval shape and locally approaches the wall of the body 4; the part 20 of the opposite wall 12 remains away from the wall 7 and the wall 7 itself also remains away from the body 4.

  The height at the contact point between the region 12 and the region 7 where the deformation acts is approximately 2 to 3 mm.

  In this way, a gentle elastic pressure is exerted on the region 12, thereby allowing the required gentle and uniform rotation of the mechanism.

  In order to allow the friction to be almost exclusively due to the friction exerted by the relief part 21 according to the invention, the other original clearance of the mechanism is reduced to a minimum. In particular, the outer duct 3, which is described as being substantially cylindrical, preferably has very little conicity, resulting in a distance of several hundred mm between its minimum diameter at the top part and the maximum diameter at the bottom part. Provided. Its top part travels directly on the outer surface of the internal duct 1 just below the rim 14, while its bottom part is formed in the bottom part of the area 13 of the duct 1 just above the ring-shaped area 12. It rests on a very thin shoulder (eg 1/10 mm). For this reason, the outer duct 3 is in the coaxial abutment on the inner duct 1 only in two regions which are formed so as to substantially reduce to a circle at the top and bottom respectively, and the friction that occurs during its relative rotation. Is minimal. Furthermore, in view of the slight conicity of the outer seat 3, and therefore its bottom skirt 7, and this conicity increases with deformation due to the limiting cam 22, on the surface of the limiting cam 21 according to the present application. It is also advantageous to provide a specific conicity (spreading downward) to apply the contact surface of this region 21 and the bottom region 7; In connection with other parameters such as 21 height and opening, the limiting force exerted is determined.

FIG. 1 is a half sectional view and a half side view of a cross section of a lipstick mechanism according to the present invention. FIG. 2 is a detailed view of a cross section of the friction part of the mechanism of FIG. FIG. 3 is a simplified detailed view of a cross section of a variation of the friction part of the mechanism of FIG. 4 is a cross-sectional view of the friction part of the mechanism of FIG. FIG. 5 is a developed view of various elements constituting the mechanism of FIG. FIG. 6 is a cross-sectional view of the outer cylindrical surface of the duct in the friction part. FIG. 7 is a cross-sectional view of the outer cylindrical surface of the duct in the friction part.

Claims (11)

A lipstick mechanism of the type comprising an inner tubular duct (1) intended to enter the outer tubular duct (3), or the like, which is arranged in the inner tubular duct (1). Two longitudinal slots (10, 11) and two helical slots (5) for guiding the movement of the stud (6) of the lipstick-holder cup (2), the internal duct comprising: A cylindrical base (12) with a restriction relief (21) intended to extend telescopically on a substantially cylindrical surface (7) connected to the outer duct (3), the outer duct Characterized in that the surface (7) connected to the surface is elastically deformable and the limiting relief (21) is formed by a raised region submerged in the surface (7) , Ri Stick mechanism. A mechanism according to claim 1, characterized in that the limiting relief (21) is related to a substantially angular sector of the internal duct. A mechanism according to claim 2, characterized in that the angle (A) of the angular sector is between 70 ° and 100 °, preferably between 80 ° and 90 °. Any of the preceding claims characterized in that the limiting relief is composed of a simple off-centring of the cylindrical part (20) of the internal duct at the limiting surface (7). The mechanism according to claim 1. 5. The wall constituting the surface (7) is characterized in that it is covered with a rigid cylindrical envelope (4) and is externally associated with a space (25) allowing its deformation. The mechanism described in. 6. A mechanism according to claim 5, wherein the space (25) is characterized in that it is at least partly due to thinning of the rigid envelope. 6. A mechanism according to claim 5, characterized in that the space (25) is at least partly due to thinning of the walls constituting the surface. A mechanism according to any one of the preceding claims, characterized in that it is produced from an injected plastic material. 9. Mechanism according to claim 8, characterized in that the internal duct (1) is made of styrene resin. 10. Mechanism according to any one of claims 8 or 9, characterized in that the external duct (3) is produced from a polyacetal resin. Aside from the limiting relief (21), the inner duct (1) and the outer duct (3) are characterized in that they have contacts limited to two narrow abutment regions. The mechanism according to any one of the above.

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