Sleeve for cosmetic application device and cosmetic application device

Abstract

The invention relates to a sleeve (40) for a cosmetic application device (10) and to a cosmetic application device (10). The sleeve (40) has a tubular wall (41). The tubular wall (41) internally comprises at least one helical groove (42, 44). The sleeve (40) is used for internally accommodating the guide (14). The guide (14) includes slits (22, 24). Each helical groove (42, 44) is used to receive a lug (32) of a cup (30) of a device (10). The sleeve (40) is made of a plastic material selected from the polyester series. The selected plastic material has a load deformation temperature (T1), determined according to method A, greater than or equal to 80 DEG C, and a load deformation temperature (T2), determined according to method B, greater than or equal to 80 DEG C.

Description

Technical Field

[0001] The present invention relates to a sleeve for a cosmetic application device and a cosmetic application device. The sleeve is used for the cosmetic application device, in particular a cosmetic sleeve. The sleeve has a tubular wall, the tubular wall includes at least one spiral groove inside, the sleeve is used to accommodate a guide member inside, the guide member includes a slit, and each spiral groove is used to accommodate a lug of a cup-shaped member of the device, and the sleeve is made of a plastic material selected from the polyester series. Background Art

[0002] Conventionally, cosmetic application devices, in particular lipstick sleeves, include a mechanism for moving cosmetics between a retracted position and an application position where the cosmetics can be applied by friction.

[0003] The actuation of the mechanism is usually controlled manually by imparting to the sleeve of the device a rotational movement relative to the guide, so as to cause an axial displacement of the cup containing the cosmetic product.

[0004] This type of mechanism usually includes at least one covering, also called a cover. The covering is mounted on the sleeve and participates in the displacement of the cosmetic product. The covering is a visible aesthetic part.

[0005] Conventionally, the sheath and the sleeve are made in the form of two separate parts, the material of which can be freely selected. In this concept, the two parts must be firmly connected to each other both axially and in rotation.

[0006] Typically, a metallic material such as anodized aluminum is chosen for the cladding and a plastic material is chosen for the sleeve of the mechanism.

[0007] It is known to glue the covering to the sleeve. However, this solution is not satisfactory because the adhesive can change the appearance of the device. In addition, this adds an operation during the assembly of the equipment.

[0008] It has been proposed to fix the covering axially around the sleeve by the cooperation of complementary shapes. Therefore, by folding the lower edge of the covering inwards to form a shoulder, the shoulder axially rests on an annular flange formed at the bottom of the sleeve. In addition, in order to rotate the covering with the sleeve, axial grooves or stripes are provided on the inner surface of the covering. The grooves or stripes cooperate with complementary grooves or stripes formed on the outer surface of the sleeve. However, the operations required to obtain these shapes are costly and extend the manufacturing time of the device.

[0009] It is also proposed to force-fit the aluminum cladding around the sleeve in a close-fitting manner. This assembly is indeed quick and does not require additional costly operations.

[0010] In order to achieve this assembly, the plastic material forming the sleeve should have properties that allow it to withstand different mechanical stresses under different conditions of use. In particular, the material should show good ageing resistance at different climatic temperatures. In addition, the selected material should have injection molding properties that allow the sleeve to be obtained by injection molding, although the wall thickness of the sleeve is uneven and the minimum value is very low. So far, only polyoxymethylene (POM, its acronym) has been used for this purpose, because it does have the properties required for the molding of the sleeve and for the mechanical strength under various climates. However, due to regulatory factors, especially environmental factors, this material can no longer be used now. Summary of the invention

[0011] The present invention proposes a sleeve for a cosmetic application device, in particular a cosmetic sleeve, the sleeve having a tubular wall, the interior of the tubular wall including at least a spiral groove, the sleeve being used to accommodate a guide member including a groove internally, and each spiral groove being used to accommodate a lug of a cup-shaped member of the device, the sleeve being made of a plastic material selected from the polyester series.

[0012] The selected plastic material has a deflection temperature under load determined according to method A of ISO 75-2:2003 standard of greater than or equal to 80° C., and a deflection temperature under load determined according to method B of ISO 75-2:2003 standard of greater than or equal to 80° C.

[0013] According to another aspect of the invention, the plastic material comprises at least 10% glass fibers.

[0014] According to another aspect of the invention, the plastic material is formed from a copolyester.

[0015] According to another aspect of the invention, the plastic material is polybutylene terephthalate.

[0016] According to another aspect of the invention, the sleeve is made in one piece by moulding of plastic material.

[0017] According to another aspect of the invention, the nominal thickness of the wall of the sleeve is between 0.6 mm and 0.8 mm.

[0018] According to another aspect of the invention, the helical groove is formed directly during the molding process by reducing the nominal thickness of the wall.

[0019] According to another aspect of the invention, the thickness of the wall at the at least one spiral groove is between 30% and 50% of the nominal thickness of the wall.

[0020] According to another aspect of the present invention, Tritan is excluded from the selection.

[0021] The present invention also relates to a cosmetic application device, in particular a cosmetic sleeve, comprising:

[0022] - a cup-shaped member for receiving the sleeve and comprising at least one lug;

[0023] - a guide comprising a tubular body in which a cup is mounted and axially slides, the guide comprising at least one slot through which at least one lug associated with the cup passes;

[0024] a tubular sleeve in which the body is rotatably mounted, the sleeve comprising at least one groove inside for receiving at least one lug of the cup-shaped element, wherein the rotation of the guide relative to the sleeve causes the cup-shaped element to move axially between an extended extreme position and a retracted extreme position;

[0025] - A tubular sheath into which the sleeve is forcibly inserted.

[0026] The sleeve is made according to the teachings of the present invention.

[0027] In another aspect of a device made according to the teachings of the present invention, the sheath has a smooth inner surface that contacts the sleeve.

[0028] In another aspect of a device made according to the teachings of the present invention, the sleeve has a smooth outer surface that contacts the sheath. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features and advantages of the present invention will become apparent upon reading the following detailed description, for which understanding reference should be made to the accompanying drawings which are briefly described below.

[0030] Figure 1 is a perspective view showing a device made in accordance with the teachings of the present invention in an installed position.

[0031] Figure 2 yes Figure 1 An exploded perspective view of a device comprising a guide, a cup, a sleeve and a sheath.

[0032] Figure 3 is similar to Figure 2 A view in which the components are taken along Figure 2 Section of the cross-sectional plane 3-3.

[0033] Figure 4 is along Figure 1 A cross-sectional view of the cross-sectional plane 4-4 in which the cup-shaped member is in the extreme contraction position.

[0034] Figure 5 is similar to Figure 4 , with the cup in its extended extreme position. DETAILED DESCRIPTION

[0035] By convention, the "axial" direction in the figure corresponds to the direction of the main axis A of the device (also called mechanism), which is intended to be mounted on an actuating base of a cosmetic application device such as a cosmetic sleeve, in particular a lipstick sleeve, and the "radial" direction radiates from the main axis to the surrounding and is orthogonal to the axial direction.

[0036] In the following detailed description of the figures, the terms "upper" and "lower", or "higher" and "lower" will be used in a non-limiting manner with reference to the axial direction, the upper part of the device corresponding to the part where the cosmetic cannula protrudes from the device for its application.

[0037] Similarly, the terms "external or outer" and "inner or inner" are used with reference to a radial direction, outer elements being radially further from the axis A than inner elements.

[0038] The figures show a device 10 intended to be mounted on an actuating base of an applicator container for cosmetic products.

[0039] Preferably, the cosmetic (in Figure 4 and Figure 5 ) is a cosmetic sleeve 12, more specifically, the cosmetic sleeve 12 is a lipstick sleeve intended to be applied by friction, as a variation, a lip care cream.

[0040] The device 10 is designed to release the cosmetic product by at least one rotational movement.

[0041] The device 10 has an axis A referred to as the main axis.

[0042] The device 10 includes at least one guide 14. The guide 14 is Figure 2 and Figure 3 Especially visible in.

[0043] The guide member 14 mainly includes a tubular main body 16. The main body 16 axially extends from a base 18 forming the lower end of the guide member 14 to an upper protruding opening 20. The upper protruding opening 20 is used for the cosmetic sleeve 12 to pass through.

[0044] The outer surface of the base 18 is provided with, for example, stripes to facilitate the operation of the base 18 when the device 10 is used or to facilitate coupling the base 18 with a base when necessary.

[0045] Preferably, the guide 14 comprises at least one slot passing radially through the wall of the body 16. Each slot forms a slideway. In this case, the guide 14 comprises here a first slot 22 and a second slot 24 passing radially through the wall of the body 16. The slots 22 and 24 are arranged diametrically opposite each other.

[0046] The slits 22, 24 extend axially in the body 16 of the guide 14, the first slit 22 being closed at its axial upper end and the second slit 24 being open. The slits 22, 24 are closed at their lower ends on the base 18 side.

[0047] Each of the slits 22, 24 has straight and parallel edges. The first slit 22 includes an upper notch 26a at one of its axial ends and a lower notch 28a at the other of its axial ends. The notches 26a, 28b extend in the circumferential direction.

[0048] In both embodiments, the second slot 24 also includes an upper notch 26b and a lower notch 28b.

[0049] In conventional systems, the notches 26 a , 26 b , 28 a , 28 b are used to form locking means at the end of travel of the cup 30 .

[0050] The device 10 includes a cup 30 that houses the cosmetic cartridge 12 .

[0051] The cup 30 is used to be mounted in the guide 14, such as Figure 4 The contraction limit position shown and Figure 5 Axial sliding between the extended extreme positions shown.

[0052] like Figure 4 As shown, the retracted extreme position corresponds to a position in which the sleeve 12 is inside the device 10 to protect and store the sleeve 12 and the cup 30 is in a low end-of-stroke position.

[0053] like Figure 5 As shown, the extended extreme position corresponds to a position in which the sleeve 12 is extended axially upward so that the free end of the sleeve 12 extends out of the device 10 through the opening 20 and the cup 30 is in a high end-of-stroke position.

[0054] The cup-shaped member 30 can also occupy an intermediate position between its two extreme positions, namely the contracted extreme position and the expanded extreme position, which is called the intermediate application position.

[0055] The cup-shaped member 30 includes at least one lug 32, preferably two lugs 32. Each lug 32 projects radially outward, each lug 32 engages with one of the slots 22, 24 of the guide 14, and the lug 32 passes through the slots 22, 24 to extend radially outward to the outside of the cylindrical outer surface of the body 16 of the guide 14.

[0056] The cup-shaped member 30 comprises an axially extending cylindrical wall 34. The wall 34 defines a housing 36 for accommodating the lower part of the sleeve 12. The housing 36 opens upward through the inlet 33. The inner surface of the cylindrical wall 34 is provided with ribs 38 for firmly fixing the sleeve 12 in the housing 36.

[0057] The device 10 comprises a sleeve 40. As shown, the sleeve 40 comprises a tubular wall 41 having a main axis A.

[0058] Preferably, the sleeve 40 comprises at least one groove inside, which receives the free end of the lug 32 associated with the cup 30. Here, the sleeve 40 comprises two grooves 42, 44 diametrically opposite. During operation, the free end of the lug 32 of the cup 30 cooperates with the grooves 42, 44. The wall 41 of the sleeve 40 comprises a cylindrical inner surface 46 provided with said grooves 42, 44. Here the grooves 42, 44 have a spiral shape. The wall 41 of the sleeve 40 also comprises a smooth cylindrical outer surface 47.

[0059] The wall 41 of the sleeve has a determined nominal thickness "e1", for example between 0.6 mm and 0.8 mm, for example equal to 0.7 mm. Figures 3 to 5 As shown, the thickness “ e1 ” is measured between the inner surface 46 and the smooth outer surface 47 of the sleeve 40 .

[0060] Furthermore, since the grooves 42, 44 are formed in the thickness of the wall 41, the thickness "e2" of the wall 41 of the sleeve 40 is less than the nominal thickness "e1" at the grooves 42, 44. The thickness "e2" is measured radially between the bottom 49 of the grooves 42, 44 and the smooth cylindrical outer surface 47 of the sleeve 40. Thus, the thickness "e2" of the wall 41 at the grooves 42, 44 is, for example, between 30% and 50% of the nominal thickness "e1" of the sleeve 40. For example, the thickness "e2" of the wall 41 at the grooves 42, 44 is between 0.20 mm and 0.40 mm, preferably between 0.25 mm and 0.35 mm, for example equal to 0.28 mm.

[0061] The sleeve 40 includes an upper edge 50 located at an axial upper end thereof and a lower edge 52 located at an axial lower end thereof, respectively, and the edge 50 and the edge 52 are continuous in the circumferential direction.

[0062] The sleeve 40 is used to be mounted on the guide 14 by means of a ratchet mechanism so as to obtain a particularly Figure 1 , Figure 4 and Figure 5 The device 10 is shown.

[0063] The guide 14 is mounted in the sleeve 40, rotating about the main axis "A". The guide 14 is therefore concentrically housed inside the sleeve 40. The outer diameter of the body 16 of the guide 14 is therefore substantially equal to the inner diameter of the sleeve 40.

[0064] exist Figure 4 and Figure 5 In the embodiment shown, without limitation, the resilient ratchet mechanism is obtained here by an annular protrusion 54 extending from the lower portion of the inner surface 46 of the sleeve 40. A collar 56 radially extends from the outer surface of the body 16 adjacent to the base 18. The collar 56 is used to resiliently ratchet over the protrusion 54 of the sleeve 40 when the body 16 of the guide 14 is axially inserted from bottom to top through the lower opening in the sleeve 40. The collar 56 then axially rests on a shoulder 57 of the sleeve 40.

[0065] The collar 56 is formed in a lower portion 60 of the sleeve 40 extending toward the lower end of the tubular wall 41. The outer diameter of the lower portion 60 is slightly greater than the outer diameter of the outer surface 47 of the wall 41 of the sleeve 40. The lower portion 60 is connected to the outer surface 47 by a shoulder 62 axially upward.

[0066] Here, the slot 22 of the guide 14 opens upwards through a cutout 58 which leads to the upper edge of the body 16 defining the opening 20. Through this cutout 58, the guide 14 can be radially deformed to facilitate the installation of the sleeve 40 before restoring the original shape of the guide 14.

[0067] In such a device 10, the guide 14 causes the axial movement of the cup 30 by its base 18 relative to the sleeve 40, more precisely, the upward or downward movement of the cup 30 in the rotation direction. When the cup 30 is in the extended limit position, the upper part of the cup 30 extends axially outside the sleeve 40.

[0068] The cosmetic sleeve 12 moves axially together with the cup-shaped member 30 between an extended extreme position and a retracted extreme position.

[0069] For aesthetic reasons, it is known to equip the sleeve 40 with a tubular sheath 64, sometimes called a shell or sheath, or according to its English name "A-shell" (aluminum mid-beam). The sheath 64 has a smooth cylindrical inner surface 66, which is intended to come into contact with the smooth cylindrical outer surface 47 of the sleeve 40. The sleeve 40 is forcibly inserted into the sheath 64 in a tight fit. This forcible installation makes it possible to fix the sheath 64 to the sleeve 40 axially and rotationally about the main axis A.

[0070] Here, only the lower portion 60 of the sleeve 40 remains outside the sheath 64. Therefore, the lower end edge 68 of the sheath 64 is in contact with the shoulder surface 62.

[0071] The jacket 64 is typically made of metal, such as aluminum.

[0072] like Figure 4 and Figure 5 As shown, the sheath 64 includes an annular upper edge 70. The upper edge 70 extends radially inwardly over the opening 20 of the guide 14 when the device 10 is installed.

[0073] The sleeve 40 is made of a plastic material. For recycling reasons, the sleeve 40 is made of a plastic material selected from the polyester series. For example, the plastic material can be a copolyester.

[0074] However, the plastic material must have properties that allow installation by forcing the sheath 64 into place, and such installation should be stable over time and under varying (sometimes extreme) climatic conditions. For example, the installation of the sheath 64 on the sleeve 40 is considered to be sufficiently secure when the sleeve 40 with the sheath 64 installed is exposed to a climatic cycle such as defined in ISO 4892-3:2016 and withstands an axial tear force of 50 Newtons.

[0075] However, it has been found that certain polyesters, such as polyethylene terephthalate (PET) or polyethylene terephthalate glycol (PETG), in their formulations typically used for this type of device, do not make it possible to obtain a sufficiently secure and durable installation of the sheath 64 with a tight fit.

[0076] The present invention proposes to select a polyester satisfying multiple conditions from among a plurality of polyesters.

[0077] The first condition is that the load deflection temperature (abbreviated as HDT, ie “Heat Deflection Temperature”) “T1” of the selected plastic material determined according to method A of standard ISO 75-2:2013 (load of 1.80 MPa) is greater than or equal to 80°C.

[0078] The second condition is that the load deflection temperature (HDT) "T2" of the selected plastic material determined according to method B (load of 0.45 MPa) of standard ISO75-2:2013 is greater than or equal to 80°C.

[0079] The load deflection temperature (HDT) "T1, T2" is the temperature from which a specimen of the selected plastic material deforms normally under a given specific load. This method is applicable to plastic materials that are rigid at room temperature and have a thickness of 3 to 13 mm.

[0080] The specimen is placed on two supports 100 mm apart in an oven, and the temperature rise of the oven is set to 2°C / min (degrees Celsius per minute). A bending load is applied to the upper part of the sample using a punch. For example, the international standard ISO75-2:2013 for the characterization of plastics requires a load of 1.80 MPa (method A) or 0.45 MPa (method B).

[0081] As a non-limiting example, by using these parameters to select a copolyester suitable for manufacturing such a sleeve 40, the inventors were thus able to quickly discover a copolyester sold by SK Chemicals under the trademark “ECOZEN T110”. This product has a deformation temperature “T1” equal to 81° C. obtained according to method A and a deformation temperature “T2” equal to 97° C. obtained according to method B. This copolyester therefore satisfies the two previous conditions.

[0082] According to another non-limiting example, the inventors have also been able to find that polybutylene terephthalate (PBT) containing 10% glass fibers has the desired properties. This product in fact has a deformation temperature "T1" equal to 190°C obtained according to method A and a deformation temperature "T2" equal to 215°C obtained according to method B. It therefore meets the first two conditions.

[0083] In addition, the selected material must also satisfy a third condition. In fact, although the thickness "e2" of the wall 41 at the grooves 42, 44 is small, they must have the necessary properties to obtain the sleeve 40 by molding. This third condition is experimentally verified by molding the sleeve 40 with a material that responds positively to the first two conditions.

[0084] Therefore, the ECOZEN T110 material and the glass-filled PBT can be successfully used to mold the sleeve 40 with the desired dimensions.

[0085] These two materials are given as non-limiting examples, and any other plastic material of the polyester family that meets the three conditions mentioned above actually allows obtaining a strong assembly of the sheath 64 with the sleeve 40 obtained with this material.

[0086] In contrast, a plastic material, such as that sold by Eastman Chemical under the trademark Tritan, although having deformation temperatures "T1, T2" that satisfy the first two conditions, does not have the injection molding properties required to mold the sleeve 40. Therefore, this material is excluded from selection because it does not satisfy the last condition.

[0087] Advantageously, the guide 14 , the cup 30 and the sleeve 40 are advantageously made of plastic material.

[0088] Preferably, the guide 14, cup 30 and sleeve 40 are made of the same plastic material to facilitate recycling.

Claims

1. A sleeve (40) for a cosmetic application device (10), in particular a cosmetic sleeve (12), the sleeve (40) having a tubular wall (41), the tubular wall (41) comprising at least one spiral groove (42, 44) inside, the sleeve (40) being used to accommodate a guide (14) inside, the guide (14) comprising a slit (22, 24), each spiral groove (42, 44) being used to accommodate a lug (32) of a cup-shaped part (30) of the device (10), the sleeve (40) being made of a plastic material selected from the polyester series, It is characterized in that The selected plastic material has a load deflection temperature (T1) greater than or equal to 80°C determined according to method A of ISO75-2:2003 standard (load of 1.80 MPa), and a load deflection temperature (T2) greater than or equal to 80°C determined according to method B of ISO75-2:2003 standard (load of 0.45 MPa).

2. The sleeve (40) according to the preceding claim, characterized in that The plastic material comprises at least 10% glass fibers.

3. The sleeve (40) according to the preceding claim, characterized in that The plastic material is formed from a copolyester.

4. The sleeve (40) according to claim 2, characterized in that The plastic material is polybutylene terephthalate PBT.

5. The sleeve (40) according to any one of the preceding claims, characterized in that The sleeve (40) is made in one piece by moulding of plastic material.

6. The sleeve (40) according to any one of the preceding claims, characterized in that The nominal thickness (e1) of the wall (41) of the sleeve (40) is between 0.6 mm and 0.8 mm.

7. The sleeve (40) according to the preceding claim, characterized in that The helical grooves (42, 44) are formed directly during the molding by reducing the nominal thickness (e1) of the wall (41).

8. The sleeve (40) according to the preceding claim, characterized in that The thickness (e2) of the wall (41) at the at least one helical groove (42, 44) is between 30% and 50% of the nominal thickness (e1) of the wall (41).

9. The sleeve (40) according to any one of the preceding claims, characterized in that Teflon copolyester was excluded from the selection.

10. A cosmetic application device (10), in particular a cosmetic sleeve (12), comprising: - a cup-shaped element (30) for receiving said sleeve (12) and comprising at least one lug (32); - a guide (14) comprising a tubular body (16) in which the cup (30) is mounted and axially slides, the guide (14) comprising at least one slot (22, 24) through which the at least one lug (32) associated with the cup (30) passes; a tubular sleeve (40) in which the body (16) is rotatably mounted, the sleeve (40) comprising inside at least one groove (42, 44) for receiving at least one lug (32) of the cup (30), the rotation of the guide (14) relative to the sleeve (40) causing the cup (30) to move axially between an extended extreme position and a retracted extreme position; - a tubular sheath (64) into which the sleeve (40) is forcibly inserted; Characterized in that the sleeve (40) is made according to any one of the preceding claims.

11. Device (10) according to the preceding claim, characterized in that The sheath (64) has a smooth inner surface (66) that contacts the sleeve (40).

12. The device (10) according to claim 10 or 11, characterized in that The sleeve (40) has a smooth outer surface (47) that contacts the sheath (64).

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