VACUUM STORAGE CONTAINER
A storage container for storing and preserving food items includes a base providing a storage cavity and an attachable lid. To evacuate air from the storage cavity after the base and lid have been attached, the storage container may include a one-way valve element communicating with the storage cavity. The overall storage container can be sufficiently rigid so that it has an initial size and volume when in its un-evacuated condition. During evacuation, the air pressure within the storage cavity is reduced compared to the air pressure of the surrounding environment. This pressure differential can result in a compressive force being applied about the container. At least one of the base or lid can be made relatively flexible so that, when evacuated, the volume of the storage container is reduced.
A variety of different containers are available for storing and preserving food items for later consumption. Such containers may be flexible, as in the case of plastic storage bags, or may be rigid, as in the case of plastic storage containers. An advantage of rigid storage containers is that they can maintain their shape and thereby protect the stored food items from being crushed. Another advantage is that rigid containers are usually easily washable and therefore can be reusable. Also, it is desirable that rigid containers be temperature and microwave resistant to allow for heating, cooling and freezing of the stored food items within the container.
To accomplish these advantages, rigid containers are often made as a relatively thick-walled structure of a stiff material such as glass or polycarbonate plastic. Such materials, in addition to being relatively heavy, are also costly. It is also desirable to reduce the quantity of air that may become trapped within the container during storage.
BRIEF SUMMARYA storage container for storing food items may include a base delineating a storage cavity and a detachable lid connectable to the base to seal the contents. To remove air trapped in the storage cavity after the base and lid have been attached, the storage container can include a one-way valve element that allows air to be evacuated. The one-way valve element is normally closed so as to seal the cavity with respect to the environment and thereby maintain the evacuated condition of the storage device.
At least one of the base and/or lid may be made of a flexible or semi-flexible material. For example, in one aspect, the lid can be made comparatively flexible with respect to a more rigid base. Under vacuum conditions, when the air pressure within the storage cavity is reduced with respect to the pressure of the environment surrounding the storage container, the flexible container can collapse or move into the storage cavity. Hence, the storage cavity can have an initial un-evacuated condition with a given initial volume and a subsequent evacuated condition which is less than the initial volume. Additionally, when in the evacuated condition, the storage container can have a reduced head space and smaller overall volume. In other embodiments, the base can be comparatively flexible with respect to the lid or both the lid and the base may demonstrate degrees of flexibility.
An advantage of the storage container is that it facilitates improving the freshness of food items by retaining those food items in an evacuated state. Another advantage is that, when evacuated, the container has a reduced size and head space for improved storage of the evacuated container. Additionally, the reduced size and/or head space can provide a visual indication to a user about the presence and prolonged maintenance of the evacuated condition of the container. These and other advantages and features of the storage container will be apparent from the following drawings and detailed description of the embodiments.
The base 102 can be made from any suitable, rigid material including, for example, tempered glass, polypropylene, polyethylene, polycarbonate, polystyrene, or polyester. Such materials may be sufficiently firm so as to maintain the set shape of the base under a variety of conditions. Hence, the base is generally free-standing and can be used for both storing and serving food items. Additionally, to facilitate food preparation and storage, the material of the base may be selected to enable washing, heating and freezing of the storage container. The base material may be transparent, translucent, or opaque.
To completely enclose the storage cavity 106, the lid 104 can be formed as another circular structure including having a peripheral edge 120 that corresponds to the rim 116. The lid 104 has a shape so that it may extend over and across the opening 118 to cover the storage cavity 106. In this embodiment, the lid 104 may have an overall planar shape. In other embodiments, the lid 104 can have other shapes and sizes depending upon the shape and arrangement of the base 102.
To securely attach the base 102 and the lid 104 together and facilitate an air tight seal between them, the upper rim 116 of the base can be configured as a projecting tongue. Specifically, the rim 116 can be formed by folding or bending the cylindrical sidewall 112 radially outward and downward so that the rim is generally shaped as an arch extending annularly around the axis line 114. Disposed into the lid 104 about the periphery 120 is a corresponding substantially U-shaped groove 122. In the illustrated embodiment, the groove 122 is provided by forming into the material of the lid 104 an upward arch 124 extending about the periphery 120 and in which the groove is located. Referring to
Referring back to
To evacuate the storage cavity, referring to
During evacuation, the vacuum device 150 is placed adjacent to the lid 104 so that the nozzle 152 surrounds the valve element 140. When the airflow generating device is activated which draws air through the nozzle 152, the flexible skirt 142 of the valve element 140 lifts upward from the lid 104 exposing the apertures 128. Thus, air trapped in the storage cavity 106 can be removed by the vacuum device 150. When the vacuum device 150 is turned off or removed from the storage container 100, the skirt 142 resiliently falls adjacent the lid 104 covering the apertures 128 and thereby preventing environmental air from reentering the container 100. Moreover, the vacuum within the storage cavity 106 will tend to pull the flexible skirt 142 adjacent the lid 104 via the apertures 128 and thereby the apertures remain sealed.
To improve functionality and storage of the storage container 100, at least one of the base 102 and/or lid 104 can demonstrate some comparative or measurable flexibility. This flexibility enables the storage container to change in size and/or shape as air is evacuated from the storage cavity. Hence, as the pressure inside the storage cavity is reduced from an initial pressure equal to the surrounding atmospheric pressure to an evacuated pressure substantially less than the surrounding atmospheric pressure, the initial volume of the storage container can likewise be reduced to a smaller evacuated volume. The smaller evacuated volume may result in improved food freshness in storage. The smaller evacuated volume may facilitate storage of the evacuated storage container in, for example, a crowded refrigerator. Additionally, the reduced volume can provide a visual indication to a user that the evacuated state of the storage container has or has not been maintained during storage.
In the illustrated embodiment of
However, located radially or annularly between the central boss 130 and the peripheral arch 124 can be one or more concentric flexible zones 132. The flexible zone 132 can demonstrate increased flexibility with respect to the comparatively rigid zones that can correspond to central boss 130 and peripheral arch 124. The increased flexibility can be provided by alternating the thickness of the lid or by altering the elasticity of the material of the lid in the appropriate areas. For example, the material thickness corresponding to the rigid zones can be in a range from about 0.13 to about 3.00 mm.
Referring to
When the storage cavity 106 is accessed by detaching the lid 104 from the base 102, the evacuated state of the container is eliminated and the flexible zone 132 can recover to its undistorted shape and the lid can return to its initial shape illustrated in
While evacuation of the above described storage container can be achieved by a vacuum device, it will be appreciated that in other embodiments, evacuation can occur by hand manipulation of the container. Particularly, referring to
Referring to
To enable evacuation of the storage cavity 206 after the base 202 and lid 204 are attached, the storage container 200 can include a one-way valve element 240 attached to the lid and which communicates with the storage cavity. Specifically, the valve element 240 is illustrated as being attached to the center portion 226 of the lid 204. As described herein, the valve element 240 can interface with a vacuum device to allow air to be drawn from the storage cavity 206. In other embodiments, the valve element could be in other locations.
At least one of the base and/or lid can demonstrate a relative flexibility that allows the storage container to alter shape and/or size between its normal, un-evacuated state and its evacuated state. For example, the base 202 can be sufficiently rigid or firm to maintain its shape under a number of conditions. However, the lid 204 can be formed with alternating zones of rigidity and relative flexibility or elasticity. The zones of rigidity can correspond to the center 226 of the lid 204 to which the valve element 240 is attached and to the peripheral edge 220, both of which can be made from a suitable rigid thermoplastic such as polypropylene, polyethylene, polyethylene trephthalather, nylon, polycarbonate, polystyrene or ethylene vinyl acetate. To provide the flexible zone 232, the material in the annular middle portion of the circular lid 204 can be made of a relatively flexible or elastic material such as: (1) block copolymers, such as, styrene butadiene-styrene triblocks, copolyesters, polyurethanes and polyamides; (2) elastomer/thermoplastic blends, such as, elastomer thermoplastic (TEO) blends with 20-30 parts of rubber based ethylene-propylene-diene monomer (EPDM) in a continuous phase of 70-80 parts of plastic such as isotactic polypropylene; or (3) elastomeric alloys, such as, elastomeric alloys (EA) which are highly vulcanized rubber systems with vulcanization having been done dynamically in the melted plastic phase. The hardness of the flexible or elastic zones can be in a range from about 3 to about 80 Shore A scale. The flexible or elastic zone 232 can include a plurality of annular corrugations 234 concentrically arranged about the comparatively rigid center 226 of the lid 204. The alternating zones within the lid can be produced by any suitable process including, for example, over-molding.
Referring to
Referring to
To form the illustrated embodiment of the lid 304, a thin-walled sheet or membrane can be molded to include a central portion 320 and a downward depending sidewall 322. The size and shape of the central portion 320 and the depending sidewall 322 corresponds in size and shape to the sidewall 312 of the base 302. Thus, the lid 304 can be pulled over the base 302 so as to cover the opening 318 as illustrated in
When the base 302 and the lid 304 are attached and the container 300 is in its normal un-evacuated state, the central portion 320 of the elastic lid can be stretched over the opening 318 and is generally parallel to the bottom wall 310 of the base. Additionally, the elastic material of the lid helps maintain this arrangement. However, in the evacuated state when the air pressure within the storage cavity 306 is reduced with respect to the surrounding environmental air pressure, the elastic material allows the central portion 320 of the lid to depend through the opening 318 and into the storage cavity 306 as illustrated in
In another embodiment, the lid 304 may include a flexible central portion 320 and a rigid sidewall or rim 322. The rigid sidewall 322 may be attached to the flexible central portion 320. The flexible central portion 320 may be made from the materials noted above. The rigid sidewall 322 may be made from a suitable rigid thermoplastic such as polypropylene, polyethylene, polyethylene trephthalather, nylon, polycarbonate, polystyrene or ethylene vinyl acetate. The rigid sidewall 322 may allow for easier attachment and removal of the lid 304 from the base 302.
Referring to
As shown in the illustrated embodiment, the lid 404 of flexible material can be initially provided as a square or rectangular sheet 420 with the valve element 440 generally located at the center. The sheet 420 can be made from a thin, flexible web of thermoplastic material such as polypropylene, polyethylene, EVA, thermoplastic polyester, or combinations thereof. The flexible nature of the sheet material allows it to wrap and gather about the rim of the base in a manner that thereby securely attaches the sheet and base together. Desirably, the strength of the grip or adhesion between the sheet and base is such as to affect a substantially air-tight seal therebetween.
Moreover, as illustrated in
When the sheet 420 is wrapped or attached to the base 402, the sheet can typically extend or be stretched across the opening 418 generally planar to the bottom wall 410. However, when the storage container 400 is in the evacuated condition and the air pressure within the storage cavity 406 is reduced with respect to the surrounding environment, the flexible sheet 420 can be partially drawn through the opening 418 and into the storage cavity 406 as illustrated in
Referring to
The base 502 can be designed to be comparatively flexible with respect to the more rigid lid 504. Specifically, the base 502 can be designed to collapse upon itself. To facilitate collapsing of the base 502, the sidewall 512 can be comprised of a material that is comparatively flexible with respect to the lid 502 and with respect to the bottom wall 510 and rim 516. The flexibility can be achieved by selecting suitable materials and/or additives or by altering dimensions and thickness of the materials. Different materials can be formed together by any suitable process including, for example, overmolding. Additionally, the base 502 can be formed with a plurality of telescoping or nesting folds in the form of hollow circular bands that are operatively connected together. Referring to
As the storage container 500 is evacuated and the pressure within the storage cavity 506 is reduced with respect to the surrounding environment, the folds 530, 532, 534 of the sidewall 512 can begin to collapse together. Referring to
Referring to
Referring to
Referring to
Disposed concentrically into the valve body 742 may be a counter-bore 760. The counter-bore 760 may extend from the first flange face 750 part way towards the boss face 754. The counter-bore 760 may define a cylindrical bore wall 762. Because it extends only part way toward the boss face 754, the counter-bore 760 may form within the valve body 742 a planar valve seat 764. To establish fluid communication across the valve body 742, there is disposed through the valve seat 764 at least one aperture 766. In the illustrated embodiment, a plurality of apertures 766 may be arranged concentrically and spaced inwardly from the cylindrical bore wall 762.
To cooperatively accommodate the movable disk 744, the disk is inserted into the counter-bore 760. Accordingly, the disk 744 may be smaller in diameter than the counter-bore 760 and has a thickness as measured between a first disk face 770 and a second disk face 772 that may be substantially less than the length of the counter-bore 760 between the first flange face 750 and the valve seat 764. To retain the disk 744 within the counter-bore 760, there may be formed proximate to the first flange face 750 a plurality of radially inward extending fingers 776. The disk 744 can be made from any suitable material such as, for example, a resilient elastomer.
Referring to
Referring to
When storage container 800 is being evacuated, air from the storage cavity can pass through the hole 828 disposed through the lid 804 and the aperture 846 thereby partially displacing the top layer 844 from the base layer 842. The air can then pass along the channel formed between the adhesive strips 848 and escape to the environment. When the force driving evacuation subsides or ceases, the resilient top layer 844 will return to its prior configuration covering and sealing the aperture 846. The valve element 840 may also contain a viscous material such as an oil, grease, or lubricant between the two layers in order to prevent air from reentering the storage container. In an embodiment, base layer 842 may also be a rigid sheet material. In another embodiment, the base layer 842 may be eliminated and the top layer 844 may be adhered directly to the lid 804 by strips of adhesive. In another embodiment, the hole 828 in the lid 804 may be a slit or slits in the sidewall.
Illustrated in
All references, including publications, patent applications, and patents, cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein.
The use of the terms “a” and “an” and “the” and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms “comprising,” “having,” “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
Exemplary embodiments are described herein. Variations of those embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventor(s) expect skilled artisans to employ such variations as appropriate, and the inventor(s) intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.
Claims
1. A storage container comprising:
- a base including a base sidewall providing a storage cavity accessible by an opening;
- a lid attachable to the base for covering the opening; and
- a one-way valve element communicating with the storage cavity;
- wherein at least one of the base and lid is relatively flexible.
2. The storage container of claim 1, wherein the lid is comparatively flexible with respect to the comparatively rigid base.
3. The storage container of claim 2, wherein the container has a first condition in which the lid attached to the base is generally planar across the opening and a second condition in which the lid depends through the opening into the storage cavity.
4. The storage container of claim 2, wherein the lid includes flexible zones and rigid zones.
5. The storage container of claim 4, wherein the flexible zones have a first material thickness and the rigid zones have a second material thickness, the first material thickness being less than the second material thickness.
6. The storage container of claim 4, wherein the flexible zones have a first modulus of elasticity and the rigid zones have a second modulus of elasticity, the first modulus being less than the second modulus.
7. The storage container of claim 2, wherein substantially the whole lid is elastic.
8. The storage container of claim 7, wherein the material of the lid includes a thermoplastic elastomer or a silicone.
9. The storage container of claim 2, wherein the lid is comprised of a flexible sheet of thermoplastic material attachable to the base.
10. The storage container of claim 9, wherein the flexible sheet includes a plurality of protrusions formed on its surface.
11. The storage container of claim 1, wherein the base is comparatively flexible with respect to the comparatively rigid lid.
12. The storage container of claim 11, wherein the base includes a relatively rigid rim and a collapsible sidewall operatively connected to the rim.
13. The storage container of claim 12, wherein the base has a first normal condition in which the sidewall depends from the rim and a second evacuated condition in which the sidewall is substantially collapsed within the rim.
14. The storage container of claim 11, wherein the base includes a plurality of telescoping folds nestable together.
15. A storage container comprising:
- a base including a base sidewall having a circular tongue projecting upwards from the sidewall, the base providing a storage cavity accessible by an opening;
- a lid including a ridge having a groove and extending generally around and proximate to the lid peripheral edge, the lid attachable to the base for covering the opening; and
- a one-way valve element communicating with the storage cavity;
- wherein at least one of the base and lid is relatively flexible.
16. The storage container of claim 15, wherein the lid is comparatively flexible with respect to the comparatively rigid base.
17. The storage container of claim 16, wherein the container has a first condition in which the lid attached to the base is generally planar across the opening and a second condition in which the lid depends through the opening into the storage cavity.
18. The storage container of claim 16, wherein the lid includes flexible zones and rigid zones.
19. The storage container of claim 18, wherein the flexible zones have a first material thickness and the rigid zones have a second material thickness, the first material thickness being less than the second material thickness.
20. A method of storing and preserving food items comprising:
- (i) providing a storage container including a base defining a storage cavity, an attachable lid, and a valve element communicating with the storage cavity, wherein at least one of the base and lid is flexible;
- (ii) inserting food items into the storage cavity;
- (iii) attaching the lid to the base to enclose the storage cavity;
- (iv) evacuating air from the storage cavity through the one-way valve element while simultaneously reducing the volume of the storage container.
Type: Application
Filed: Nov 20, 2008
Publication Date: Oct 21, 2010
Inventors: Robert T. Dorsey (Orland, IL), Ryan J. Coonce (Palatine, IL)
Application Number: 12/741,921
International Classification: B65B 31/04 (20060101); B65D 51/16 (20060101); B65D 6/16 (20060101);