Airtight Compact

Abstract

An airtight cosmetic compact, wherein the airtight feature is created by interaction between a seal on the inside of the cover and the upwardly facing recess of the base. The cover locks on the base by either thread elements on both cap and base or by bayonet like cams, allowing the cover to be twisted on the base compressing the cover against the base and engaging the seal with the base recess. By compressing the seal against the base and holding it in place through the threaded engagement the air-tightness of the compact is achieved and guaranteed.

Claims

1. A cosmetic case comprising: a base having a recess defined by a recess wall; a screw piece inside of said base; a ring free to rotate about said recess wall; an elevator; a cover; wherein rotation of said cover about said recess wall forms an airtight seal between said base and said cover; wherein rotation of said ring moves said elevator in a vertical direction.

2. A cosmetic case according to claim 1, wherein said elevator and said screw piece each further comprise mating threads such that engagement of said threads and rotation of said elevator causes said movement of said elevator in said vertical direction.

3. A cosmetic case according to claim 1, wherein said elevator further comprises at least one protrusion for controlling said movement of said elevator in said vertical direction.

4. A cosmetic case according to claim 1, wherein said ring further comprises a shoulder and said screw piece further comprises a groove, and wherein interaction of said shoulder and said groove secure said ring and said screw piece together.

5. A cosmetic case according to claim 1, wherein said cover and said base are made of at least two layers, wherein each layer is made of a material different than another layer.

6. A cosmetic case according to claim 1, wherein said cover and said recess wall each further comprise mating threads such that engagement of said threads and rotation of said cover draws said cover towards said base to form said airtight seal.

7. A cosmetic case according to claim 1, wherein said base further comprises at least one base protrusion and said cover each further comprises at least one cover protrusion, and wherein at least one of said at least one cover protrusion engages with at least one of said at least one base protrusion to secure said cover in a secured position.

8. A cosmetic case according to claim 7, wherein said secured position is an open or closed position.

9. A cosmetic case comprising: a base having a recess defined by a recess wall; a cover; a ring; mating threads on said recess wall and said cover; a sealing element affixed to said cover, said sealing element having a chamfered perimeter; a chamfer on said recess wall configured to mate with said chamfered perimeter on said sealing element; wherein rotation of said cover about said recess wall engages said mating threads on said cover and recess wall and draws said cover towards said base; wherein drawing said cover towards said base engages said chamfered perimeters on said cover and said recess wall and forms an airtight seal between said base and said cover.

10. A cosmetic case comprising: a base having a recess defined by a recess wall; a cover; a ring; an elevator; a screw piece.

11. The cosmetic case according to claim 10, wherein said elevator and said screw piece are contained within said recess.

12. The cosmetic case according to claim 10, wherein said elevator is contained within said ring.

13. The cosmetic case according to claim 10, wherein both said elevator and said screw piece have threads that mate with each other.

14. The cosmetic case according to claim 10, wherein both said elevator and said ring have threads.

15. The cosmetic case according to claim 10, further comprising a projection.

16. The cosmetic case according to claim 15, wherein said projection inhibits the bottom of said elevator from rising above the bottom of said ring.

17. The cosmetic case according to claim 10, wherein said ring has a groove.

18. The cosmetic case according to claim 17, wherein said screw piece has a shoulder.

19. The cosmetic case according to claim 18, wherein said shoulder and said groove restrain said ring.

20. The cosmetic case according to claim 10, wherein said cover further comprises a valve seal ring.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0027] FIGS. 1 and 2 depict side views of embodiments of an airtight compact in accordance with the invention.

[0028] FIGS. 3 and 4 depict rear views of the compacts shown in FIGS. 1 and 2.

[0029] FIGS. 5 and 6 depict side views of the compacts shown in FIGS. 1 and 2 with the covers opened.

[0030] FIGS. 7 and 8 depict perspective views of the compacts shown in FIGS. 1 and 2 with the covers opened.

[0031] FIGS. 9 and 10 depict top views of the compacts shown in FIGS. 1 and 2 with the covers opened.

[0032] FIGS. 11 and 12 depict rear views of the compacts shown in FIGS. 1 and 2 with the covers opened.

[0033] FIGS. 13 and 14 depict front views of the compacts shown in FIGS. 1 and 2 with the covers opened.

[0034] FIGS. 15 and 16 depict bottom perspective views of the compacts shown in FIGS. 1 and 2 with the covers opened.

[0035] FIGS. 17 and 18 depict sectional views of the compacts shown in FIGS. 1 and 2 with covers closed and seal open.

[0036] FIGS. 19 and 20 depict sectional views of the compacts shown in FIGS. 1 and 2 with covers closed and seals formed.

[0037] FIGS. 21, 22, and 36 depict top views of the intermediate ring of the embodiments of the invention shown in FIGS. 1 and 2.

[0038] FIGS. 23 and 24 depict upper perspective views of the intermediate ring of the embodiments of the invention shown in FIGS. 1 and 2.

[0039] FIG. 25 depicts a lower perspective view of the intermediate ring of the embodiment of the invention shown in FIG. 2.

[0040] FIGS. 26 and 30 depict upper perspective views of the cover of the embodiments of the invention shown in FIGS. 1 and 2.

[0041] FIGS. 27 and 31 depict lower perspective views of the cover of the embodiments of the invention shown in FIGS. 1 and 2.

[0042] FIGS. 28, 32, and 39 depict side views of the base of the embodiments of the invention shown in FIGS. 1 and 2.

[0043] FIGS. 29 and 33 depict upper perspective views of the embodiments of the invention shown in FIGS. 1 and 2.

[0044] FIGS. 34 and 35 depict sectional views of embodiments of the invention shown in FIGS. 1 and 2.

[0045] FIGS. 37 and 38 depict zoomed in views of the ring protrusion embodiments of the intermediate ring of the embodiments of the invention shown in FIGS. 1 and 2.

[0046] FIG. 40 depicts a side view of another embodiment of the invention shown in FIG. 1, where the compact case in the closed position.

[0047] FIG. 41 depicts a side view of another embodiment of the invention shown in FIG. 1, where the compact case in the open position.

[0048] FIG. 42 depicts a top view of another embodiment of the invention shown in FIG. 1, where the compact case in the opened position.

[0049] FIG. 43 depicts an exploded view of another embodiment of the invention shown in FIG. 1.

[0050] FIG. 44 depicts a cross-sectional side view of another embodiment of the invention shown in FIG. 1, where the compact case in the closed position.

[0051] FIG. 45 depicts a cross-sectional side view of another embodiment of the invention shown in FIG. 1, where the compact case in the open position.

[0052] FIG. 46 depicts a zoomed in cross-sectional view of the sealing mechanism of another embodiment of the invention shown in FIG. 1, where the compact case in the closed position.

DETAILED DESCRIPTION

[0053] The invention relates to airtight compacts or cosmetic cases, which for the purposes of this patent will be used interchangeably to refer to small, portable containers for cosmetics with or without hinged covers, and with or without affixed mirrors. In particular, the invention relates to airtight compacts in which only a single cover is opened to expose the cosmetic for use. In these compacts, a cosmetic product is stored in a recess (13) comprising a base (5) and a cover (1). When the cover is closed, an airtight seal is formed between the cover and the base. In some embodiments, the recess is sized to fit a standard size cosmetic pan (41), advantageously permitting use of the cosmetic case for a variety of colors and compositions of cosmetics. In some embodiments, the recess is sized to contain an industry standard cosmetic pan. In some embodiments the recess is sized to fit longer and narrower objects, such as foundation sticks, lip sticks, or lip balm.

[0054] In some embodiments the recess (13) is defined by a recess wall (17) extending upwardly from an upper surface (6) of the base (5) having an upwardly facing open end defined by a lip (19). In some embodiments cover 1 has a downwardly facing seal (14) configured to engage the lip of the recess to form an airtight container for the cosmetic product. In some embodiments, the seal is a flexible or elastomeric material affixed to the cover. Pressure holding the cover to the base provides force to deform the flexible or elastomeric material sufficiently to provide an airtight function between the cover and the lip of the recess. In other embodiments, the cover is made of a flexible or elastomeric material and deforms sufficiently to provide an airtight function without providing an additional seal.

[0055] In some embodiments, the seal is a valve seal ring. This is a ring of flexible or elastomeric material extending off of the cover and configured to engage the lip (19) of the recess. In some embodiments, as shown in FIGS. 17 and 18, the external periphery (25) of the valve ring seal engages the internal periphery (23) of the lip of the recess to form an airtight seal when the cover is held down to the base. In other embodiments, the internal periphery of the valve ring seal engages the external periphery of the lip of the recess. In still other embodiments, the bottom surface of the valve ring seal engages the top surface of the lip of the recess. In further embodiments, the valve ring seal is slotted to engage both the internal and external periphery of the lip of the recess.

[0056] In many embodiments using a valve seal ring, the engaging surfaces of the valve seal ring and the lip of the recess are chamfered slightly in opposite directions (63). In an embodiment in which the external periphery of the valve ring seal engages the internal periphery of the lip of the recess, the external periphery of the valve ring seal tapers slightly from larger at its upward extent to smaller at its downward extent. Conversely, the internal periphery of the lip of the recess is tapered slightly from smaller at its upward extent to larger as it approaches the base, as shown by 63 in FIGS. 35 and 46. This has the advantageous effect of compressing the valve seal ring as it is pressed into the lip of the recess, improving the airtight function of the container. The chamfers provide slight differences in the terminal diameters of the engaging surfaces which allow a more positive seating of the valve seal ring to the lip of the recess due to the size difference of the terminal diameters of the engaging surfaces as the cover is closed, and the resulting sloped surfaces allow more of the pressure holding the cover to the base to be applied directly to the engaging surfaces.

[0057] In some embodiments, the seal is a disc of flexible or elastomeric material affixed to the cover on one surface and configured to engage the top surface of the lip of the recess on the other surface. In some embodiments, the disc is flat, providing advantages in ease of construction. In other embodiments, the disc is convex, the center extending further from the cover than the periphery, providing more positive centering and sealing to an interior periphery of the lip of the recess. In still other embodiments, the seal is concave, the periphery extending further from the cover than the center, providing an enlarged storage space inside the airtight chamber and being less likely to disturb and ornamental upper surface on the product in the receptacle.

[0058] In other embodiments, the seal is an annular gasket affixed to the cover.

[0059] In some embodiments, a seal is provided on the base, configured to engage a corresponding surface on the cover. In one embodiment, the lip of the recess comprises a flexible or elastomeric material which forms an airtight function when pressed against the cover. In other embodiments, the cover further comprises a downwardly protruding feature configured to engage the flexible portion of the lip to provide the airtight function. In one embodiment, the downwardly protruding feature is a ridge configured to engage one or more of the internal periphery, the external periphery, or the surface of the lip of the recess. In another embodiment, the downwardly protruding feature is a disc with an external periphery configured to engage the internal periphery of the lip of the recess. In different embodiments, the disc is flat, convex, or concave. In some embodiments, the engaging surfaces of the lip of the recess and the downwardly protruding feature of the cover are chamfered slightly in opposite directions, advantageously improving the airtight function of the container.

[0060] FIGS. 1 and 2 illustrate two embodiments of the airtight compact of the current invention. In FIG. 1, the hinge is external to the diameter of the compact. In FIG. 2, the hinge is contained within the external diameter of the compact. These embodiments comprise a cover (1), an intermediate ring (3) and a base (5). They further comprise a hinge (7) of two parts molded into the cover and the intermediate ring, and a hinge pin (9) to maintain the hinged relationship between the cover and the intermediate ring. As can be seen from FIGS. 7-8, the base contains a recess (13) formed from a wall (17) extending upwardly from the base. As shown in FIGS. 21-25, 28-33, and 36-39 the intermediate ring (3) is fixed to the cover by protrusions (29) extending inwardly from the inner surface of the intermediate ring, the protrusions fitting into matching grooves (31) in the wall. This allows the intermediate cover to rotate with respect to the base about the external diameter of the wall, while preventing the ring from being detached from the base. The upward extent of the wall forms a lip (19) defining the opening of the recess.

[0061] In some embodiments, the grooves are defined by an upper and lower edge, each parallel to the upper surface of the base, the groove being wider than the thickness of the protrusions. This allows the ring to move axially with respect to the base within the groove, the protrusions free to move perpendicular to the groove to an extent limited by the edges of the groove. This limited freedom of axial movement aids in engaging the threads on the cover and base and eases the requirement for machining to tight tolerances. Because the cover is attached to the ring by a hinge, a slight opening of the hinge permits the threads to engage even if there is some variation between manufactured parts.

[0062] In some embodiments, a riser (33) is provided at the terminus of the groove. This advantageously lifts the ring away from the surface of the base at the extent of the ring's rotation, preventing any separation of the cover from the ring during rotation from wedging the ring against the recess wall as the cover is unscrewed. In one embodiment, the riser is a portion of the lower edge of the groove that slopes upward in relation to the upper surface of the base. In some embodiments riser 33 is provided on base 5 without a corresponding groove on the base.

[0063] FIGS. 21-22 and 36-39 show different embodiments of ring protrusions 29. In some embodiments ring protrusion 29 is made up of just ledge 44. In some embodiments ring protrusion 29 is made up of bump 42, gap 43 and ledge 44. In some embodiments the bump, gap, and ledge are placed in the listed order clockwise and in other embodiments the order is reversed, having the ledge, then gap then bump in clockwise order. This bump, gap, ledge motif interacts with base protrusion 49 to secure the cover assembly in a certain position, depending on the location of the protrusions. In some embodiments ring protrusion 29 is a ledge 44 and hook 45 which also interacts with base protrusion 49 to secure the cover assembly in a certain position. In some embodiments the ledge is followed by the hook in clockwise order, and in other embodiments the hook precedes the ledge in clockwise order. In some embodiments ledge 44 is approximately the size shown in FIG. 36, while in other embodiments ledge 44 is smaller than depicted in FIG. 36 and in other embodiments ledge 44 is larger than depicted in FIG. 36. In some embodiments ledge 44 is less than 0.5 centimeters, in some embodiments ledge 44 is 0.5-1 cm, and in other embodiments ledge 44 is 1-2 cm. The different sizes of ledge 44 are required for different functions. If ledge 44 us being used to guide ring 3 through groove 31 and riser 33 a larger ledge 44 is required. However, if ledge 44 is being used simply as a locking or movement halting piece, the smaller embodiments of ledge 44 are adequate. In this way the minimum amount of material is used to effect the desired function of ledge 44. In some embodiments, the cover assembly is secured in an open position. This embodiment is useful for ensuring the cover does not rotate and interfere with the use of the contents of the compact case. In other embodiments the cover assembly is secured in a closed position. This embodiment is useful for determining when the cover assembly is in the fully closed position as a means of avoiding content leakage or spoilage, and also aids in securing the cover assembly in said closed position. In yet other embodiments, the cover assembly is secured in an intermediary position.

[0064] As seen in FIG. 39, in some embodiments, the bump, gap, and ledge motif is located on the base, as seen with bump 47, gap 48 and ledge 49. This motif interacts with protrusion 46 on the ring to secure the cover assembly in a certain position, depending on the location of the protrusions. As discussed above, in some embodiments the order of the bump, gap, and projection is reversed from what is depicted in FIG. 39. In other embodiments, the hook 50 and ledge 51 motif is located on the base. As discussed above, in some embodiments the order of the hook and projection is reversed from what is depicted in FIG. 39. In some embodiments, the cover assembly is secured in an open position. This embodiment is useful for ensuring the cover does not rotate and interfere with the use of the contents of the compact case. In other embodiments the cover assembly is secured in a closed position. This embodiment is useful for determining when the cover assembly is in the fully closed position as a means of avoiding content leakage or spoilage, and also aids in securing the cover assembly in said closed position. In yet other embodiments, the cover assembly is secured in an intermediary position.

[0065] FIGS. 40-46 illustrate other embodiments of this invention, where ring 3 is located inside of cover 1 when closed. This can be seen comparing FIG. 40, which shows the closed structure of one embodiment of this invention, and FIG. 41 which shows the opened structure of the same embodiment. In some embodiments, an internal screw piece (54) and elevator (52) are contained within recess 13, as seen in exploded FIG. 43. FIGS. 44 and 45 show an embodiment where base 5 contains screw piece 54, and ring 3 sits on the top (59) of the ring (58) on screw piece 54. In some embodiments, elevator 52 is contained within ring 3 and projects through the bottom of ring 3 into screw piece 54. In some embodiments cover 1 fully covers ring 3.

[0066] In some embodiments, elevator 52 has threads (57) which match the threads (56) on screw piece 54. In this embodiment, as ring 3 is rotated with respect to base 5 (or as base 5 is rotated with respect to ring 3), the matching threads 56 and 57 engage and push elevator 52 up or down, depending on the direction of the rotation. In this embodiment ring 3 does not move in a vertical direction. These, and other similar embodiments, are useful for only allowing a small portion of the contents of the container to be exposed to air at a given time. As only the portion of the contents which are above ring 3 are exposed to air on all sides, this allows the contents to last longer than if significantly more surface area was exposed to air each time the case was opened. In some embodiments, threads are located on the inside of ring 3. In some embodiments, both ring 3 and elevator 52 have threads and move in a vertical direction when rotated with respect to base 5. In some embodiments only ring 3 and not elevator 52 moves in a vertical direction when rotated with respect to base 5. In other embodiments ring 3 moves in a vertical direction and no elevator is provided as a means of reducing the amount of components in the device.

[0067] In some embodiments, the bottom of elevator 52 is kept from rising above the bottom of ring 3 by projection 60. As seen in FIG. 46, in some embodiments, ring 3 is substantially restrained from moving in the vertical direction by groove 61 on ring 3 and shoulder 62 on screw piece 54. In some embodiments, two rings are present, one that makes up the cover assembly, as in FIG. 1, and one that is engaged in the screwing mechanism discussed in the preceding paragraph. This embodiment is useful as it combines the benefits of having a cover assembly fixed to the base with a ring or elevator system which protects the contents of the case by limiting the amount of air exposure on all sides.

[0068] In some embodiments, the cover (1) further comprises a valve seal ring (14) on the internal surface (15). The external periphery (25) of the valve seal ring is chamfered slightly, as shown in FIGS. 17-20, 34, 35, and 46. The internal periphery (23) of the lip of the recess is also chamfered slightly as shown in FIGS. 17-20, 34, 35, and 46, and configured to engage the external periphery of the valve seal ring (63). As the cover is pressed against the base, the valve seal ring is compressed into the lip of the recess, forming an airtight function in the recess.

[0069] In some embodiments, threads (21) are provided on the cover (1) to engage threads (11) provided on the wall (17) extended upwardly from the base. The cover is pressed against the base by engaging the threads on the cover and the threads on the base and rotating the cover and the base with respect to each other. This pressure is sufficient to engage the valve seal ring and the lip of the recess to form an airtight seal.

[0070] As shown in FIGS. 15-20, in some embodiments a mirror (27) is attached to the bottom of some embodiments of the invention. This has the dual purpose of providing the largest possible reflective surface without increasing the size of the compact, and hiding the openings formed at the bottom of the base. In addition, a mirror on the outside surface allows its use without having to open the case and unnecessarily expose the contents to air. In other embodiments, a mirror is affixed to internal surface 15. This embodiment is ideal for using the mirror while the case is opened, such as when applying makeup contained inside of the case. In other embodiments, a mirror is affixed to the top of the cover (64). This embodiment is useful as it combines the benefits of having a large surface area, the ability to use the mirror while using the contents of the case, and the ability to use the mirror without opening the case.

[0071] To open some embodiments of the invention, the cover and base are rotated with respect to each other until the threads on the cover disengage from the threads on the base, and then the cover is lifted to open the hinge between the cover and the intermediate ring. To close these embodiments, the cover is lowered and the cover and base are rotated with respect to each other until the threads engage and the cover is pressed sufficiently against the base to form an airtight seal between the valve seal ring and the lip of the recess.

[0072] In some embodiments, the function and structure of the hinge (7) and hinge pin (9) are replaced by a living hinge. This advantageously permits the cover (1) and the intermediate ring (3) to be molded or machined from a single piece of material, retaining a thin flexible diaphragm between the two. The cover and intermediate ring are folded together at the center of the diaphragm, leaving the diaphragm as a living hinge. This embodiment advantageously reduces the cost and complexity of manufacturing and is especially suited in smaller applications such as providing compacts for promotional samples of cosmetics. In some embodiments the living hinge remains external to the outer profile of the intermediate ring and the cover when the cover is closed. In other embodiments, the intermediate ring is provided with a depression into which the living hinge fits when the cover is closed, advantageously allowing a smooth external profile on the cosmetic case. In other embodiments, the cover is provided with a depression into which the living hinge fits when the cover is closed, while in still other embodiments, both the intermediate ring and the cover are provided with a depression, advantageously allowing a wider range of hinged motion between the intermediate ring and the cover while preserving a smooth profile to the outer surface of the cosmetic case when the cover is closed.

[0073] In other embodiments, the invention utilizes bayonet mounts rather than threads to press the cover to the base. In one embodiment, one or more lugs are formed on the inside of the cover, configured to engage corresponding slots formed in the base. Engaging the lugs with the slots and rotating the cover and base with respect to each other has the effect of tightening the cover onto the base. In another embodiment, the one or more lugs are formed on the base to engage corresponding slots in the cover. Other mechanisms for pressing the cover to the base including latches and spring clips can be envisioned without departing from the spirit of the invention.

[0074] In some embodiments, a manual vacuum break is provided. This is especially advantageous when the contents are fine dry powders. In these cases, the process of unscrewing the cover can form a vacuum inside the receptacle as the airtight seal is broken, and the inrushing air can scatter the contents. In other cases, the process of screwing down the cover to form the airtight seal compresses the air inside the container, leading to higher pressure inside the container than outside and potentially leading to blowing about of the powder as the pressure is released when the cover is open. By manually breaking the seal using a vacuum break before the cover is turned, such scattering is avoided. In some embodiments, the vacuum break is a channel through the cover of the case, held closed by spring tension and opened by depressing an actuator on the outside of the case. In some embodiments, the vacuum break is formed as an integral part of the cover and the spring tension is provided by the resilience and elasticity of the material from which the cover is formed.

[0075] In other embodiments, a one-way valve is provided. This can advantageously reduce the increase in pressure caused by screwing down the cover to form an airtight seal by allowing the air to escape as the cover is screwed down. The one-way valve allows air to escape from inside the container when the pressure inside is higher than the pressure outside, but prevents outside air from entering the container, thus preserving the contents.

[0076] In other embodiments, a chamber (35) is provided in vapor contact with the recess when the airtight seal is engaged. In one exemplary embodiment, as shown in FIG. 34, the chamber is located in the base of the cosmetic case, beneath the recess containing the product. In a second exemplary embodiment, as shown in FIG. 35, the chamber is located in the cover, above the recess containing the product when the cosmetic case is sealed. This chamber is charged with a substance (37) for preserving the contents contained in the receptacle. In some embodiments, especially advantageous when the contents are in a dry powdery form, the chamber is charged with a desiccant. In varying embodiments, the desiccants are alternatively silica gel, magnesium sulfate, and sodium sulfate. The desiccant advantageously absorbs any water entering the cosmetic case when it is opened, preventing the cosmetic from absorbing water and caking up.

[0077] In other embodiments, especially advantageous when the cosmetic product is an aqueous paste, the substance is a water source, advantageously preventing the contents from drying out as water is lost when the container is opened. In one embodiment, the water source is water absorbed onto a suitable absorbent material such as cotton, cellulose, or hydrophilic sponge. In another embodiment the water source is a hydrated hydrophilic gel. In yet another embodiment, the water source is a solid such as clay, zeolite, calcium carbonate, or magnesium sulfate, the solid being in a hydrated form.

[0078] In still further embodiments, especially advantageous when the contents contain a volatile organic solvent such as hexane, ethyl acetate, ethyl alcohol, or isopropyl alcohol, the substance is a solvent compatible with that of the contents, the solvent absorbed onto a suitable absorbent material such as foam, cloth, or paper. In still further embodiments, the substance is alternatively a biocide, a bactericide, a fungicide, or combinations thereof, advantageously preventing biological contamination of the cosmetic product.

[0079] In some embodiments, cover 1 and base 5 consist of one material and in other embodiments cover 1 and base 5 consist of more than one material. In some embodiments, cover 1 and base 5 consist of one layer, and in other embodiments cover 1 and base 5 consist of more than one layer. In some embodiments the different layers are the same material, and in other embodiments the different layers are different materials. An example of the embodiment with different material layers is shown in FIG. 43 where cover 1 has an external layer 53, and base 5 has an external layer 55. The embodiments with different material layers are useful for allowing flexibility in the materials contained in the cosmetic case. Some of the solvents listed above are corrosive or damaging to certain types of materials. Thus, it is beneficial to be able to line the inside of the container with a material which is more durable, but may be more expensive or not as aesthetically pleasing, while maintaining a cheaper and more aesthetically pleasing external material.

[0080] In some embodiments, the substance is separated from the recess by a perforated divider (39) to prevent loss of the contents of the recess into the chamber. In other embodiments, especially advantageous when the contents are finely divided powders which might pass through a perforated divider, the substance is separated from the recess by a membrane (43) permeable to vapors but impermeable to finely divided solids, to prevent entry of the contents of the recess into the chamber.

[0081] These descriptions and drawings are exemplary of specific embodiments only and are not intended to be limiting to the scope of the invention defined in the claims.