U.S. patent application number 10/795475 was filed with the patent office on 2004-09-09 for pressure vacuum release hermetic valve for rigid container packages.
Invention is credited to Jeor, Bret de St.
Application Number | 20040173626 10/795475 |
Document ID | / |
Family ID | 32930719 |
Filed Date | 2004-09-09 |
United States Patent
Application |
20040173626 |
Kind Code |
A1 |
Jeor, Bret de St |
September 9, 2004 |
Pressure vacuum release hermetic valve for rigid container
packages
Abstract
A rigid container package, such as made of tin, metal, etc.,
having an interior for holding particulate material, such as food
stuffs (like coffee beans), under vacuum, and which includes a
mouth to be opened to provide access to the contents of the
package. The package is preferably formed from a rigid material in
the form of a container, such as a tin box, and has affixed thereon
a one-way pressure-equalizing valve. The valve preferably includes
a displaceable rubber disk located on a valve seat and is arranged
to operate such that any gasses within the package are allowed to
vent to the exterior of the package, by passing through the
interface between the disk and valve seat, while the ambient
atmosphere is substantially precluded from entering into the
interior of the package. The disk then engages the valve seat to
isolate the interior of the package from the exterior. A layer of
silicone oil or similar material is preferably provided on the disk
to facilitate operation of the valve. The valve is preferably
attached to the rigid container via an aperture that is made
slightly smaller than the exterior mating portion of the valve,
such that the smaller portion of the valve can be passed through
the aperture, and the expanded portion of the valve can then be
allowed to firmly rest against the exterior of the rigid container
material, wherein friction between the container and valve
(resulting from an interference fit) helps to seal the aperture and
adhere the valve to the rigid container.
Inventors: |
Jeor, Bret de St; (Modesto,
CA) |
Correspondence
Address: |
J. John Shimazaki
P.O. Box 650741
Sterling
VA
20165
US
|
Family ID: |
32930719 |
Appl. No.: |
10/795475 |
Filed: |
March 8, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60452499 |
Mar 7, 2003 |
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Current U.S.
Class: |
220/745 ;
220/371 |
Current CPC
Class: |
B65D 81/2015 20130101;
B65D 51/1644 20130101 |
Class at
Publication: |
220/745 ;
220/371 |
International
Class: |
B65D 051/16 |
Claims
What is claimed is:
1. A container made of a substantially rigid material, such as tin
or metal, comprising: an aperture extending through a wall or panel
thereof, said aperture having a perimeter formed with a
substantially rigid edge extended on said wall; a one way degassing
valve extended at least partially into said aperture, providing
communication between an interior and exterior of said container,
said valve comprising: an insert portion extended into said
aperture, wherein an exterior surface of said insert portion is in
frictional engagement with said edge of said aperture; a flange
portion extended on one end of said insert portion, said flange
portion extending outward relative to said insert portion; and
wherein said valve is adapted to allow gas to pass through in a
first direction when the pressure differential between said
interior and exterior of said container exceeds a predetermined
amount, while substantially preventing gas from passing through
said valve in a second direction opposite said first direction.
2. The container of claim 1, wherein said aperture is formed
slightly smaller than the exterior surface of said insert portion,
such that with said insert portion extended into said aperture,
friction between said edge of said aperture and said exterior
surface of said insert portion can help to secure said valve to
said wall.
3. The container of claim 1, wherein said flange portion is firmly
engaged against said wall of said container adjacent said
aperture.
4. The container of claim 1, wherein said valve is positioned on
said container in a manner such that the flange portion is located
on an exterior side of said wall, and said valve prevents the gas
from passing in said second direction which is from the exterior to
the interior of said container, and allows the gas to pass in said
first direction which is from the interior to the exterior of said
container, when pressure in the interior of said container exceeds
the pressure in the exterior of said container.
5. The container of claim 1, wherein said valve comprises a cap and
base member, wherein an interior compartment is formed between the
cap and base member, and a displacement member with a layer of
viscous fluid is provided on a seat inside said compartment,
wherein the displacement member remains on said seat to prevent gas
from passing through said valve when the pressure in the interior
and exterior of said container are substantially equal, but can be
lifted from said seat to allow gas to pass through openings in said
base member and said cap, when the predetermined pressure
differential amount is exceeded.
6. The container of claim 5, wherein the tension provided by said
viscous fluid helps to keep said displacement member on said seat
in a closed position, to keep said hole in said base member closed,
until such time that the pressure differential exceeds the
predetermined amount, wherein said displacement member can be
partially separated from said seat, to enable said hole in said
base member to be opened, and allow the gas to pass through said
cap in said first direction.
7. The container of claim 6, wherein a filter is provided to cover
said hole in said base member.
8. A valve for use in connection with an aperture formed in a
substantially rigid wall, comprising: an insert portion adapted to
be extended into said aperture, wherein an exterior surface of said
insert portion is slightly larger in diameter than said aperture; a
flange portion extended on one end of said insert portion, said
flange portion extending outward relative to said insert portion;
and wherein said valve comprises a cap and base member, wherein an
interior compartment is formed between said cap and base member,
and a displacement member with a layer of viscous fluid is provided
on a seat inside said compartment, wherein said displacement member
is adapted to enable the gas to pass in said first direction,
through holes in said base member and said cap, when a
predetermined pressure differential is exceeded, and prevents the
gas from passing through said valve in said second direction.
9. The valve of claim 8, wherein the tension provided by said
viscous fluid helps to keep said displacement member on said seat
in a closed position, to close said hole in said base member, until
such time that the pressure differential exceeds the predetermined
amount, wherein said displacement member can be partially separated
from said seat, to enable said hole in said base member to be
opened, and allow the gas to pass through said cap in said first
direction.
10. The valve of claim 9, wherein a filter is provided to cover
said hole in said base member.
11. A method of securing a valve to a rigid wall of a container,
comprising: forming an aperture in said wall having a predetermined
size; providing an insert portion adapted to be extended into said
aperture, wherein an exterior surface of said insert portion is
adapted to be slightly larger in size than said aperture; providing
a flange portion extended on one end of said insert portion, said
flange portion extending outward relative to said insert portion;
and inserting said insert portion into said aperture, wherein the
friction between the exterior surface of said insert portion and
inside edge of said aperture help to maintain said valve in a
substantially fixed position on said wall.
12. The method of claim 11, wherein said valve is inserted into
said aperture until the flange rests against the wall of said
container.
13. The method of claim 11, wherein the insert portion is inserted
into said aperture from an exterior of said container, and said
valve is designed to enable gas to pass from an interior to an
exterior of said container, when a predetermined pressure
differential exists between said interior and exterior of said
container, and to prevent gas from passing from said exterior to
said interior of said container.
Description
RELATED APPLICATION
[0001] The application claims the benefit of the filing date of
U.S. provisional patent application, serial no. 60/452,499, filed
on Mar. 7, 2003.
BACKGROUND OF THE INVENTION
[0002] This invention relates generally to rigid container
packages, such as made of tin or metal, etc., and more particularly
to rigid container packages for holding products in a hermetically
sealed condition, e.g., isolated from the ambient atmosphere.
[0003] Various types of rigid container packages for holding
particulate material under vacuum therein are commercially
available today.
[0004] The major advantages of rigid container packaging, as
compared to relatively flexible packaging, e.g., paper, foil, paper
cartons, etc., are that rigid containers store more uniformly and
are typically stronger than flexible packaging. These are
significant advantages insofar as retail sales are concerned. They
are also very well known and accepted throughout the packaging
industry and have been for over 100 years.
[0005] One common type of rigid container package holds goods under
vacuum until the package is opened. This is the so-called "coffee
tin" package. Typically, such a package is formed from tin, metal
or other rigid container stock material, into a tubular or square
body, such as in various sizes, and is formed by machine to create
a "sealed" canister.
[0006] One-way degassing valves are sometimes included in flexible
packages to enable gasses produced by the particulate material
within the package, such as coffee beans, to exit from the package,
while preventing outside air from entering into the package through
the valve. Examples of such one-way degassing valves are shown in
U.S. Pat. Nos. 3,595,467, 3,799,427 and 4,420,015, which are
incorporated herein by reference.
[0007] One drawback of many flexible packaging, such as
commercially available vacuum sealed flexible packaging, is that
when the packages are filled, sealed and evacuated, the walls can
intimately engage the particulate material therein, which can
result in an uneven, bumpy, pebbly or otherwise less than
satisfactory aesthetic appearance. Another drawback is that in
retail packaging, flexible containers are easily broken, such as
when dropped by the customer, or damaged in shipping, thus
potentially creating a dirty, ugly environment. This can be
especially undesirable when the flexible container is broken or
dropped in a supermarket aisle, and its content spilled onto the
floor, which happens regularly.
[0008] Tin boxes, on the other hand, always provide a smooth,
non-bulging aesthetically pleasing appearance, while enabling the
package to be vacuum-sealed to keep the contents fresh. They also
cannot be broken, torn, ripped, etc., thus creating a much stronger
and more ideal vehicle to package fresh sensitive goods.
[0009] Accordingly, a need exists for packaging that is simple in
construction, relatively low in cost to produce, and provides the
advantages of conventional hermetically sealed packaging, but which
has a one-way degassing valve, and is constructed from an
aesthetically pleasing rigid material, so that the container has a
smooth, non-bulging external appearance, that can be printed on for
an aesthetically pleasing retail appearance, and that is easy to
fill, easy to stack, and which constitutes standard and commonly
acceptable packaging.
SUMMARY OF THE INVENTION
[0010] The present invention relates to a substantially rigid
package container, e.g., made of tin, metal or other substantially
rigid material, having an interior for holding a particulate
material, e.g., dry pet food, coffee, chemicals, etc. The package
is preferably a box-like container formed from tin, metal or other
rigid material and comprises walls or panels, inside of which
defines an open-able mouth for the package, along with a
re-sealable lid. The package preferably includes a pressure/vacuum
release hermetic degassing valve in one portion thereof, such as on
one of its panels. The package is hermetically sealed to isolate
its contents from the ambient surroundings.
[0011] The valve is arranged to operate as follows: The valve
allows any gasses within the package to gain egress from the
interior to the exterior of the package, while precluding the
ambient atmosphere from gaining ingress into the interior of the
package. Any gasses produced by the contents of the package,
therefore, can vent out of the valve to the ambient surroundings,
while any outside air is prevented from entering into the package,
thus keeping the contents as fresh as possible.
[0012] In accordance with one preferred aspect of the invention the
valve includes a displaceable member, e.g., a planar
resilient-material disk or substantially flat member or membrane,
arranged to be disposed on a valve seat, to be lifted therefrom
when the pressure within the package exceeds the pressure outside
the package.
[0013] A layer of a viscous fluid, e.g., silicone oil, is
preferably provided on the displaceable member, e.g., the disk, so
that the fluid is located at the interface of the disk and valve
seat. The presence of this fluid provides tension to the disk which
can prevent any penetration of air through the interface, but which
allows the disk to separate from the valve seat when the pressure
differential is high enough, i.e., when the pressure in the
container exceeds the pressure outside the container.
[0014] The valve is preferably attached to the rigid container via
an aperture that is made slightly smaller than the exterior mating
insert portion of the valve, such that the smaller portion of the
valve can be passed through the aperture, and the expanded portion
of the valve is then allowed to firmly rest against the exterior of
the rigid container material, wherein friction between the
container and valve (resulting from an interference fit
predominantly between the insert portion and aperture) can be used
to permanently seal the aperture and adhere the valve to the rigid
container.
[0015] Accordingly, it is a general object of this invention to
provide a rigid container package, which addresses the needs of the
prior art.
[0016] It is a further object of this invention to provide a rigid
container package for particulate material formed from tin, metal
or other rigid container material, which can be hermetically
sealed, yet which exhibits a smooth, non-bulging or concaving
exterior appearance.
[0017] It is a further object of this invention to provide a
hermetically sealed tin, metal or other rigid container package for
particulate material, which includes a degassing valve to permit
the package to reach an equilibrium state in which the pressure
within the package is equal to the pressure outside the package,
without allowing exterior air to enter into the package.
[0018] It is a further object of this invention to provide a
hermetically sealed rigid container package, which is simple in
construction, relatively low in cost, which can be manufactured
easily and which provides an aesthetically pleasing appearance.
[0019] It is a further object of this invention to provide a
hermetically sealed rigid container package for particulate
material which includes a degassing valve to enable the release of
gas from the interior of the package so it that can be readily
stacked without fear of explosion or bursting, bulging or convexing
of the rigid container.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 is a representation of a cross section of a typical
tin box having a degassing valve attached thereto on the bottom
floor thereof;
[0021] FIG. 2 is a cut-away side view of the degassing valve
positioned and secured by friction within an aperture extending
through the floor of the tin box, wherein the degassing valve is
shown with the valve seat and disk in the sealed position; and
[0022] FIG. 3 is a cross-section of the degassing valve showing the
disk and valve seat with the disk in the open position.
DETAILED DESCRIPTION OF THE INVENTION
[0023] Referring to FIG. 1, there is shown an example of a rigid
container package 1, such as made of tin or metal or other rigid
material, constructed in accordance with this invention. In the
preferred embodiment, the package 1 comprises a tin box 3 having a
pressure-equalizing one-way degassing valve 5 mounted in its base 7
or other surface (as will be described later) and a lid 9 which
securely fits on and seals the box 3. The tin box 3 is preferably
arranged to hold any particulate material e.g., coffee beans,
ground coffee, dry pet food, chemicals, etc. Moreover, the tin box
3 is particularly suitable for holding large amounts of such
materials, e.g., in excess of twenty-five pounds, although it can
be used for packaging small amounts as well.
[0024] In the preferred embodiment, the tin box 3 is formed from a
rigid material, such as tin, metal, etc., and comprises a front
wall or panel 11, a rear wall or panel (not shown), two sidewalls
or panels 13, 15, a top end portion 17, the lid 9, and the bottom
wall or panel portion 7. The top end portion 17 of the package
terminates and has lid 9 that fits securely on tin box 3, finishing
off the overall appearance of the package. The bottom wall or panel
or base end portion 7 forms the bottom of the package. The
degassing valve 5 (in this drawing) is preferably mounted in the
bottom wall or bottom panel 7, but the degassing valve 5 can be
mounted on virtually any portion of the tin box 3, including the
lid 9, rear wall, the front wall 11, or side walls 13, 15. The
degassing valve 5 is preferably in communication with the interior
of the tin box 3 regardless of its location. The valve 5 enables
gasses, which may be produced by the particulate material(s)
contained within the box 3, after it is hermetically sealed, to
vent to the ambient air, without air gaining ingress into the tin
box's 3 interior.
[0025] The front panel 11, rear panel, and the two side panels 13,
15 of the tin box 3 are preferably integral portions of a single
sheet of tin, metal or other rigid container material. Particularly
useful tin, metal or rigid container material for the tin box 3 is
commercially available companies such as Royal Summit, Inc., of
Modesto, Calif., the assignee of this invention. The lower wall or
panel 7 of the tin box 3 is preferably sealed closed along a
transverse, permanent seam line, closely adjacent the bottom edge.
The permanent seam line is preferably formed using standard sealing
techniques, such as that used by tin box factories around the
world. The tin box 3 is preferably arranged to be hermetically
sealed by bending the sheet together, which creates a permanent
seal. The lid or top 9 is manufactured so that it mates with the
tin body 3 and seals the package, thus isolating the contents of
the package from the ambient atmosphere once it is hermetically
sealed.
[0026] When the tin box 3 is filled and sealed, the particulate
materials inside will be kept isolated from the ambient air by the
tin box 3 and the application of the top or lid 9. The package can
be readily stacked in multiples in a stable manner. Moreover, the
weight of the stacked packages, plus the close conformance between
the valve on one package, and the abutting wall of an adjacent
package, can help effectively cover the valve to help maintain the
hermetical seal and aesthetics of the package. Any gasses that are
produced by the material within the package are nevertheless able
to vent to the exterior in a normal manner (as will be described
later) through valve 5.
[0027] FIG. 2 shows the valve 5 positioned inside an aperture 19
extending through a portion of the rigid container 3. In this
embodiment, the aperture 19 is located on bottom wall or panel 7,
although in other embodiments, it can be located virtually anywhere
on box 3. The valve 5 preferably has an insert portion 21 that can
be inserted and frictionally secured to the inside edge of aperture
19, and a flange 27 that can be placed over the exterior 25 of the
wall or panel 7. This serves as the means by which the valve 5 is
secured to the bottom wall 7 of the package 3, with flange 27
firmly resting on the outer surface of the package. The insert
portion 21 preferably fits securely into the rigid container 3 via
the aperture 19 that is made slightly smaller than the exterior of
the insert portion 21, such that the insert portion 21 can be
passed through the aperture 19, and the expanded flange portion 27
of the valve can then be allowed to firmly rest against the
exterior 25 of the rigid container 3, wherein friction between the
aperture 19 and insert portion 21 (resulting from an interference
fit) helps to permanently seal the aperture 19 and adhere the valve
5 to the rigid container 3.
[0028] As can be seen in FIG. 2, the internal components of valve 5
comprise an upper cap portion 29 connected to a lower base member
30 (which includes the flange 27), with an electrometric, e.g.,
rubber, disk 31 positioned inside an interior compartment 35 formed
between the cap portion 29 and base member 30. The disk can be made
in any conventional material. The cap portion 29 and base member 30
are preferably adapted to be snapped and connected together by
mating sections 32, 34, as shown, with disk 31 inside compartment
35 during assembly. A thin layer of oil 38, e.g., silicone oil is
preferably provided inside compartment 35 on disk 31 adjacent valve
seat 36, to help maintain disk 31 by tension in a sealed position
inside compartment 35.
[0029] The "sealed position" is the one shown in FIG. 2, wherein
disk 31 is positioned against valve seat 36. Disk 31 effectively
covers and seals opening 37, which communicates between compartment
35 and interior of box 3. A filter member 33 is preferably provided
on base member 30 on the interior side 24 of opening 37 relative to
disk 31 to cover opening 37 and ensure that dust and other small
particles from inside box 3, which can interfere with disk 31 and
oil 38, and therefore, the operation of valve 5, cannot be
introduced into compartment 35.
[0030] The valve 5 has two modes of operation. FIG. 2 shows valve 5
in its "closed or sealed" position, and FIG. 3 shows valve 5 in its
"pressure release mode." The second mode shown in FIG. 3 occurs
when a pressure differential is applied to the valve 5 such that
the pressure in the interior of box 3 is higher than the pressure
on the exterior of the package. In this situation, valve 5
functions to equalize the interior and exterior pressures by
allowing the higher internal pressure to break the elastic bond
between the valve seat 36, silicone oil 38, and disk 31, allowing
air to escape in the direction of arrows 40, through filter 33,
base member's opening 37, around disk 31, and through a hole 39 in
cap member 29.
[0031] Once sufficient air has been released out of the package to
equalize the internal and external pressures, the disk 31
automatically returns to it normally flat, unflexed state, shown in
FIG. 2. The surface tension of the silicone oil 38 then reseals the
bond between the valve seat 36, and disk 31. Thus, valve 5 stops
operating in the "pressure release" mode and begins operating again
in the "closed or sealed" static equilibrium mode.
[0032] The "static equilibrium mode" of operation is shown in FIG.
2 and occurs when the interior package pressure and exterior
package pressure are equal. In this situation the disk 31 remains
sealed to valve seat 36 by the viscous nature of oil 38. In
particular, the equal pressures maintain disk 31 in a flat,
unflexed position, thus keeping valve 5 closed and impermeable to
external, atmospheric gasses (e.g. Oxygen), moisture, or odors. In
all cases, the walls of the package 3 remain smooth and
non-bulging, as shown in FIG. 1.
[0033] As should be appreciated by those skilled in the art the
subject invention provides a valve which allows a tin, metal or
rigid container package to be substantially and hermetically sealed
in order to protect the package's content against external gasses,
e.g. atmospheric oxygen, moisture and odors during the large
majority of time when internal and external package pressures are
at an equilibrium. Moreover, the valve provides a viable means for
releasing entrapped air in the package so that it can be stacked
and transported with similarly constructed packages, effectively
and economically, without the risk of rupturing. Thus, the subject
invention enables the creation of an easy to handle, well shaped,
aesthetically pleasing, and durable package by enabling the vacuum
therein to be released during shipment and storage.
* * * * *