Airless type dispenser

Details Airless type dispenser Airless type dispenser

2000-07-31

2002-04-23

Shaver, Kevin (Department: 3754)

Dispensing

With discharge assistant

Container with follower

C222S256000, C222S320000, C222S387000

Reexamination Certificate

active

06375045

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to an airless type dispenser and more particularly to an airless type dispenser in which a problem like a chemical reaction between a cosmetic substance and the piston material can be prevented, and accordingly wrong operation can be avoided.
BACKGROUND OF THE INVENTION
There are two types of conventional dispensers wherein a predetermined quantity of cosmetics substance or the like is ejected by air pressure. One of which is a dip tube type wherein the substance is sucked and ejected by the dip tube and the corresponding quantity of air comes in, and the other of which is the airless type wherein a piston is ascended and the substance is pushed up according as the air comes in the receptacle evacuates.
FIG. 1
shows the airless type dispenser of the prior art. As shown in
FIG. 1
, the upper end of the receptacle is covered with a dispenser cap
12
. This dispenser cap
12
includes a pump
14
, a button
15
, and nozzle
16
. And a piston
18
is provided in the receptacle
11
airtightly. Conventionally, the piston
18
was generally made with the polyethylene resin. The reason is that, if the piston is made of polyethylene resin, it has excellent flexibility, elasticity and lubrication, and accordingly, airtightness between the piston and the inner wall of the receptacle can be secured. In addition, the piston can be readily slidable along the inner wall.
Also, the prior art polyethylene piston
18
can cause some troubles if it reacts with a pigment dispersant which may be included as a cosmetic substance. In that case, many kinds of critical defects may be resulted. One of these defects is the piston
18
may not slide along the inner wall of the receptacle
11
because the pigment dispersant which may be for foundation or makeup base is absorbed into the polyethylene piston
18
and causes swelling of the piston
18
, or the airtightness may be destroyed owing to irregular swelling. As stated above, because the polyethylene piston has high expansibility it can easily absorb cosmetic substances that contain pigment dispersant, thus, causing swelling of the piston
18
which causes defects to dispenser products.
SUMMARY OF THE INVENTION
The present invention solves the above described problems by providing an airless type dispenser that can prevent chemical reactions between cosmetic substances and the piston material.
According to an aspect of the invention, an airless dispenser is provided. The airless dispenser comprises a receptacle
11
, a piston
18
inserted in the receptacle
11
, a dispenser cap
12
which is coupled to the opening of the upper end of the receptacle
11
and includes a pump, a button and a nozzle, wherein on the upper surface of piston
18
is laminated with a material which has a lower expansibility than the piston.


REFERENCES:
patent: 4685594 (1987-08-01), Czech
patent: 5104004 (1992-04-01), von Schuckmann
patent: 5788124 (1998-08-01), Bougamont et al.

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