Lipstick tubes

Details Lipstick tubes Lipstick tubes

1999-02-03

2001-04-17

Huson, Gregory L. (Department: 3751)

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including holder

C401S078000

Reexamination Certificate

active

06217243

ABSTRACT:

TECHNICAL DOMAIN
This invention relates to lipstick tubes, designed and structured so as to form an absolutely tight closure of the cap on the tube body in order to prevent the loss of volatile components contributing to formulation of the lipstick, and also contamination of lipstick by particles in suspension in the environment that could entrain smells that could adversely affect the functions of the said lipstick.
STATE OF PRIOR ART
As everyone knows, lipstick tubes usually consist of a basic body supporting the lipstick itself, which can be pushed outwards by means of a helical drive mechanism, this assembly being used with a cap that can be coupled to the open end of the body by pressing on it, this cap providing thorough protection for the lipstick support and the lipstick itself, while providing an aesthetic closure to the entire tube.
In order to ensure that the cap remains in position on the body, the body is usually fitted with small external projections in the area over which the cap opening fits, which cause a slight elastic deformation of the cap with the resulting “clamping” effect on the body which stabilizes the connection between the two elements.
With this attachment system, recesses are necessary between the above mentioned projections which, although they are small, create a passage between the inside and the outside of the tube resulting in the problems mentioned above, namely the loss of volatile components contributing to the formulation of the lipstick and contamination of the said lipstick by its environment.
One obvious solution to this problem would be to make the cap and the body fit perfectly, but apart from the fact that it would be difficult to make in practice, this solution would require an excessive force to be exerted during extraction and replacement operations of the said cap, such that the tube would not be a convenient to use product.
GENERAL DESCRIPTION OF THE INVENTION
The lipstick tube (
20
) according to the present invention has a cap (
5
) to be coupled by pressure on a collar (
4
) emerging axially from the tube body (
1
), and is characterised in that it comprises a ring of material (
6
), firmly fixed to said cap (
5
) or to said collar (
4
) of said tube body (
1
), both being made of rigid material, said ring (
6
) having a flexible free end (
16
) forming the means of fitting, respectively, of said cap (
5
) to said collar (
4
), or of said collar (
4
) to said cap (
5
), given that said ring (
6
) is provided with an external rabbet or recess (
9
) around the periphery close to its free end defining an annular void (
10
) between the free end (
16
) of said ring (
6
) and, respectively, said cap (
5
) or said collar (
4
), towards which the said ring (
6
) may be elastically deformed when it is connected, respectively, to said collar (
4
) of the tube body or to said cap (
5
), to make an airtight closure of said tube (
20
).
The tubes according to the invention solve the problem mentioned above, by enabling a completely air tight coupling between the cap and the body, without creating any manufacturing problems or subsequent handling problems, and enabling very easy coupling and uncoupling of the said cap.
The air tightness of the tubes does not significantly decreases after a great number of cycles of coupling/uncoupling of the said cap by the user of said tubes.


REFERENCES:
patent: 5715961 (1998-02-01), Robertson
patent: 5749664 (1998-05-01), Inoue et al.
patent: 5813421 (1998-09-01), Wang
patent: 5863144 (1999-01-01), Ackermann
patent: 5984554 (1999-11-01), Bouix

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