IMPROVED AEROSOL AND OTHER PROPELLANT STYLE PRESSURIZED CAN PRODUCT DELIVERY SYSTEM

AEROSOL AMELIORE ET AUTRE SYSTEME D'OBTENTION DE PRODUIT EN BOITES METALLIQUES PRESSURISEES DU GENRE A GAZ PROPULSEUR

Description

CA 02664508 2009-03-30

My invention is an improved product delivery system for pressurized aerosol
spray cans that
contain a liquid or gaseous product. The system is not however limited to
using aerosol as a propellant.
Any non-explosive or flammable gas or liquid expanding gas may be used as a
propellant. The select
propellant need not be non-poisonous or environmentally friendly due to the
fact that it will remain
sealed off from the product and from being released into the atmosphere
indefinitely.

The invention is a piston within the spray can which separates the product
from the propellant.
As the product is released a pressure drop will occur on the product side
which will in turn allow the
propellant to expand. This will push the piston up the can keeping the
pressure of the product at a
steady level to keep the spray stream at a consistent level. This is a great
improvement over
conventional aerosol spray cans because normally the propellant is depleted
along with the product.
This creates a drop in pressure and spray stream consistency as the product is
depleted. My invention
does not allow the propellant to exit the can, it only expands as the product
is used. Once the product is
depleted the propellant remains within the can sealed from the environment.

The main objective of this system is to contain the propellant. Normal spray
cans containing
aerosol as a propellant are bad for the environment and also to the users
health. The seal can be made
hermetic so that this system may also be used to deliver non-poisonous
products like food, beverages,
medical products or anything that may be consumed and must not come in contact
with an aerosol
propellant.

Propellants other than aerosol may also be used provided that they are non-
flammable or
explosive. The propellant may be a pressurized gas, even normal atmosphere, or
any liquid that will
expand into a gas to equalize pressure.

Another advantage of having a sealed propellant is the ability to reuse the
can once the product
is depleted. With a one way valve the can be be refilled with water and used
as a water spray canister.
The propellant would simply re-compress as the new product contents are
injected.

Another advantageous feature of the invention is the fact that the propellant
and the product are
not mixed. Therefore the product may be pure and not contaminated with the
propellant. In some cases
where specific products are used this will also allow for more volume of the
product to be contained
within the can.

Another advantage to this product is the ability to spray the can upside down.
Normally aerosol
cans use an internal dipstick as the exit for the product, when the can is
turned upside down the product
and propellant change places and the propellant itself will be released. My
invention allows only the
product to be released at any time. If the can is turned upside down the
pressure from the propellant end
of the can shall still allow the product to be released as it would if it were
right side up.

Another use of this product is as a lighter whereas a small version of the
inventive system shall
be used to push lighter fluid through a nozzle. The propellant would be a non-
flammable expanding gas
or liquid expanding gas under slight pressure. The propellant pressure shall
be only enough to provide a
consistent amount of fuel to the nozzle and not to high a pressure that it may
cause the lighter fuel to
ignite.


CA 02664508 2009-03-30
In the drawings:

Figure 1 is a cross-section perspective view of a basic pressurized spray can.
Figure 2 is a cross-section perspective view of a pressurized spray can where
the piston has
piston rings.

Referring to the drawings in detail, in Figure 1 the numeral 1 represents the
straight cylindrical
walls of the can. 2 represents the curved top part of the can, at the very top
of 2 shall be 3 a hole where
an industry normal spray nozzle is attached. At the bottom of 1 the can walls
is attached 4, an inner
curved bottom for added strength of the can. (all can parts are shown as
transparent for clarity)

Within 1 the walls of the can shall be 5 a piston that has an identical curve
to 5 the bottom of the
can and 2 the top of the can to evenly distribute the forces of the contained
pressure. The piston 5 shall
have 6 a straight extrusion that shall conform to the inside of 1 the cylinder
walls to keep 5 and 6 the
piston parallel with the cans inner walls. The piston 5 separates 8 the
propellant from 9 the product
through 7, a hermetic seal between 5, 6 the piston and 1 the can walls.

The propellant 8 applies constant upward pressure against 9 the product
through 5 the piston. As
9 the product is depleted it's pressure will remain relatively constant as 8
the propellant continually
expands to keep constant pressure on 9 the product. This will create a steady
exit of 9 the product.

In Figure 2 the numeral 1 represents the straight cylindrical walls of the
can. 2 represents the
curved top part of the can, at the very top of 2 shall be 3 a hole where an
industry normal spray nozzle
is attached. At the bottom of 1 the can walls is attached 4, an inner curved
bottom for added strength of
the can. (all can parts are shown as transparent for clarity)

Within 1 the walls of the can shall be 5 a piston that has an identical curve
to 5 the bottom of the
can and 2 the top of the can to evenly distribute the forces of the contained
pressure. The piston 5 shall
have 6 a straight extrusion that shall conform to the inside of 1 the cylinder
walls to keep 5 and 6 the
piston parallel with the cans inner walls. In this version of the system the
piston 5 and 6 shall be
significantly smaller with respect to its diameter to 1 the cans inner walls.
There shall be 10 piston
rings made of a rubber, silicon or other air tight sealing material. The
piston rings shall be connected to
6 the straight extrusion part of 5 the piston. The rings 10 shall create 7 a
hermetic seal between 9 the
product and 8 the propellant. There may also be 11 a sealed space between 10
the piston rings where
nor 8 the propellant or 9 the product shall exist. This space, 11 may be a
dead air space or filled with an
oil that would lubricate travel of the piston to ease its movement as it moves
up the can walls. This oil
would also further help 7 the hermetic seal stay air tight.

The propellant 8 applies constant upward pressure against 9 the product
through 5 the piston. As
9 the' product is depleted it's pressure will remain relatively constant as 8
the propellant continually
expands to keep constant pressure on 9 the product. This will create a steady
exit of 9 the product.