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Publication numberUS20050224505 A1
Publication typeApplication
Application numberUS 10/819,411
Publication dateOct 13, 2005
Filing dateApr 7, 2004
Priority dateApr 7, 2004
Publication number10819411, 819411, US 2005/0224505 A1, US 2005/224505 A1, US 20050224505 A1, US 20050224505A1, US 2005224505 A1, US 2005224505A1, US-A1-20050224505, US-A1-2005224505, US2005/0224505A1, US2005/224505A1, US20050224505 A1, US20050224505A1, US2005224505 A1, US2005224505A1
InventorsWilliam Brown, Timothy Crowell, Sarah Haase
Original AssigneeBrown William L, Crowell Timothy E, Haase Sarah M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Leak resistant lid assembly for a beverage container
US 20050224505 A1
Abstract
A leak resistant lid for a beverage container is formed with a depending skirt portion having one or more progressively decreasing diameter rings between a lower extremity and a sealing channel adapted to fit over the rim bead of the container. An inner wall of the channel extends downwardly inside the inner surface of the side wall of the container in a plug fit relationship. The relatively deep inside plug fit provides added surface area contact for sealing the interface between the lid and the container. An elevated and rigid central plateau supports a drinking orifice and is connected to the inner wall of the channel by a reinforced, rigid flange or web which maintains the channel and its inner wall in leak resistant relationship with the rim bead and container wall.
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Claims(15)
1. A lid for closing a container, the container having a generally circular rim and an outwardly projecting annular bead on said rim, and a downwardly extending wall portion having an inner surface adapted for containing liquid, the lid comprising:
a central web;
an upstanding generally annular plateau surrounding said central web, said plateau having an outer wall extending downwardly so that an extremity of said wall is within said rim of said container when said lid is attached to said container;
a reinforcing web extending from said lowest extremity of said outer wall of said plateau to a radially inner wall of an annular sealing channel;
said sealing channel being adapted for engagement with said rim of said container;
said radially inner wall of said sealing channel having a downwardly extending wall portion adapted for engaging said inner surface of said container, and a curvilinear channel portion extending from said downwardly extending wall portion so as to engage said annular bead on said rim in a sealing relationship.
2. A lid according to claim 1 and further comprising:
an annular skirt portion extending downwardly from said channel portion outside of said bead on said rim.
3. A lid according to claim 1 wherein;
said reinforcing web comprises an array of projections at a surface of said web for stiffening said web.
4. A lid according to claim 1 wherein:
said outer wall of said plateau has a lower extremity positioned to extend below said annular bead of the container and an upper extremity extending above said rim of the container when said lid is positioned on a container for use.
5. A lid according to claim 1 wherein:
said central web, said annular plateau and said reinforcing web form a substantially rigid annular rim along a lower edge of said sealing channel; and
said lower inside edge of said sealing channel is dimensioned to provide an interference plug fit with said inner surface of said wall portion of said container.
6. A lid according to claim 5 wherein:
said interference fit is associated with a diametric dimension of approximately the thickness of said wall of said container.
7. A lid according to claim 6 wherein:
said diametric dimension is of the order of 0.04 inches.
8. A lid according to claim 3 wherein:
said projections are disposed along adjacent radial lines.
9. A lid according to claim 8 wherein:
said projections are rib shaped.
10. A lid according to claim 8 wherein:
said projections are dimple shaped.
11. A lid adapted for use in connection with a container for liquids comprising:
a generally annular sealing channel having inner and outer walls;
an annular skirt extending downwardly from said outer wall of said channel;
a reinforcing flange extending radially inwardly from said inner wall of said annular channel towards the center of said lid and having radially disposed reinforcing projections extending from a surface thereof;
an annular upstanding wall extending from a radially inner extremity of said flange to a generally annular plateau;
a central web extending radially inwardly from said plateau to form a substantially closed lid, wherein
said inner wall of said channel is dimensioned for a plug interference fit within the inner wall of a container with which it is intended for use.
12. A lid according to claim 11 for use in connection with a container having
an annular rim bead at the top edge thereof wherein:
an outer wall of said plateau has a lower extremity positioned to extend below said annular bead of the container and an upper extremity extending above said rim of the container when said lid is positioned on a container for use.
13. A lid according to claim 12 wherein:
said central web, said annular plateau and said reinforcing web form a substantially rigid annular rim along a lower edge of said sealing channel; and
said lower inside edge of said sealing channel is dimensioned to provide an interference plug fit with said inner surface of said wall portion of said container.
14. A lid according to claim 13 wherein:
said interference fit is associated with a diametric dimension of approximately the thickness of said wall of said container
15. A lid according to claim 14 wherein:
said diametric dimension is of the order of 0.04 inches.
Description
    CROSS-REFERENCE TO RELATED APPLICATIONS
  • [0001]
    Not Applicable
  • STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
  • [0002]
    Not Applicable
  • FIELD OF THE INVENTION
  • [0003]
    This invention relates to containers for liquids, to lids for such containers and, more specifically, to replaceable, leak resistant lids for containers or cups having a generally cylindrical or frusto-conical shape.
  • [0004]
    Although the invention described herein is particularly suitable for application to beverage drinking cups, a person skilled in this art readily may apply the invention to other similar containers which require a removable, leak resistant lid.
  • SUMMARY OF THE INVENTION
  • [0005]
    In accordance with the present invention, a highly leak resistant “sipper” lid suitable for paper beverage cups is provided. The unintentional passage of liquid between the mating surfaces of a cup and a lid is effectively suppressed. This feature meets consumer expectations in that, when consumers purchase drinks in cups with lids applied, they expect the cup/lid combination to prevent leakage between the mating surfaces when the cup is inclined for drinking. However, many designs fall short of this important objective.
  • [0006]
    A particular problem arises in connection with some containers which are formed such that each of their side wall and rim are formed into a closed vessel by overlapping the material (relatively thick paper) at a joint or seam. When a lid having a spout or orifice for drinking is placed over such a thick seam, there is a tendency for leakage out of the lid in that area of the rim. One approach to this problem has been to attempt to educate customers to orient the lid on the cup so that the drinking orifice is diametrically opposite the joint or seam, thereby placing the leakprone area above the level of liquid in the cup when drinking is in progress. This approach is not entirely successful since many users do not receive, understand or remember this instruction.
  • [0007]
    In accordance with one aspect of the present invention, a lid adapted for use in connection with a container for liquids comprises a generally annular mounting ring or channel for sealably engaging an upper edge or rim of a container, an annular skirt extending downwardly from the mounting ring over an outer wall of the container, an annular flange extending radially inwardly from the mounting ring and an annular, upstanding wall extending from a radially inner extremity of the flange to a generally annular plateau. The plateau, in turn, is connected to a central region which serves to form a closed lid structure. A drinking orifice typically is provided in the plateau region.
  • [0008]
    The annular mounting ring is complementarily configured with respect to the container with which it is to be combined so as to provide a plug fit against the inner wall of the container and to engage the rim thereof to provide a desired leak resistant seal. These and other objects and advantages of the present invention will become apparent from the following detailed description in conjunction with the accompanying drawings.
  • BRIEF DESCRIPTION OF THE DRAWING
  • [0009]
    In the drawings:
  • [0010]
    FIG. 1 is a front elevation view of a cup or container having one form of a lid in accordance with an embodiment of this invention;
  • [0011]
    FIG. 2 a is a plan view of a particular lid according to a preferred embodiment of the invention;
  • [0012]
    FIG. 2 b is a cross-sectional view taken along the line B-B′ of FIG. 2 a;
  • [0013]
    FIG. 2 c is a partial cross sectional view showing a stack of two of the lids of FIG. 2 a;
  • [0014]
    FIG. 3 is a partial, enlarged cross-sectional view of the portion of the lid enclosed in a dashed circle in FIG. 2 b, showing relationships between the lid and container;
  • [0015]
    FIG. 4 is a partially cut away elevation view of one type of standard container suitable for use in connection with this invention;
  • [0016]
    FIGS. 5 a, 5 b and 5 c are views similar to those shown in FIGS. 2 a, 2 b and 2 c of a second embodiment of the invention; and
  • [0017]
    FIG. 6 is a partial, enlarged cross-sectional view of the portion of the lid enclosed in a dashed circle in FIG. 5 b.
  • DESCRIPTION OF ILLUSTRATIVE EMBODIMENT OF THE INVENTION
  • [0018]
    Referring to FIG. 1, a typical container or cup assembly 10 suitable for beverages and being formed from paper, plastic, plastic foam or the like, in a generally cylindrical or frusto-conical shape, is shown. A lid 12 constructed according to the present invention is shown sealably mounted at the top of container 10. Lid 12 (other forms of which are shown in greater detail in others of the figures) preferably is produced by thermoforming a thin, flat sheet of clear or opaque (black, white or colored) plastic such as polystyrene onto a lid mold to form the desired lid shape which will be explained below. The lid may also be formed by injection molding while maintaining the desired properties and characteristics as set forth hereinafter. The thickness of the plastic for the lid typically is about 0. 017 inches in its finished form.
  • [0019]
    The container 10 typically is a paper cup suitable for hot or cold beverages and will be referred to hereinafter as cup 10. As is customary, such cups have a substantially tubular (circular cross section) bead 14 (see FIG. 4) formed at their upper edge and extending radially outwardly from the generally cylindrical or conical upright wall 16 of the cup.
  • [0020]
    As can be seen in FIGS. 2 a-3, lid 12 comprises a generally inverted U-shaped sealing channel 18 having a cross-section (FIG. 3) with an interior wall 22 of generally the same curvilinear to straight shape as the combination of the outer extremity of bead 14 and the upper end of the wall 16 of cup 10. More specifically, on lid 12, the outer (maximum diameter) portion 20 of channel 18 is generally tubular in shape and it transitions smoothly into a substantially vertical, straight, inclined inner wall member 24 which is outwardly inclined at its upper end. Wall member 24 is inclined at substantially the same angle A (e. g. 6.25 degrees) as the wall of the cooperating cup 10. Inner wall member 24 is adapted to extend downwardly inside wall 16 of cup 10 in a “plug fit” relationship.
  • [0021]
    A negative clearance or plug interference fit such as 0.04 inches for a cup 10 having a specified maximum outside bead diameter of 3.54 inches is provided between the inner wall 24 of channel 18 and the inner surface 16′ of wall 16 of cup 10. This deep inside plug fit provides the desired surface area contact for sealing the interface between the adjacent surfaces of lid 12 and cup 10.
  • [0022]
    In addition, at a sloped transition region 28 between a lower extremity of channel 18 and an upper extremity of a skirt 32, an undercut or reentrant wall 30 is provided which has an minimum inner wall diameter, for example, 0.05 inches less than the maximum inner wall diameter 30 of channel 18 as best seen in FIG. 3 (“0.025 UNDERCUT”).
  • [0023]
    A lowermost inner corner 26 of inclined inner wall 24 is shown having a diameter of 3.25 inches. As shown in FIG. 4, the outermost diameter of the rim bead 14 for a corresponding cup 10 has a nominal value of 3.54 inches. The bead 14 itself is specified as having a nominal diameter of 0.14 inches. It can therefore be seen that the maximum opening at the top of cup 10 (measured at the uppermost point on rim bead 14 where the inner surface 16′ of cup wall 16 begins to slope downward and inwardly) is nominally 3.54 inches minus 0.14 inches or 3.50 inches. The lowermost inner corner 26 of inclined wall 24 of channel member 18 therefore will fit into the top of rim bead 14 with a clearance of about 0.07 inch on each side (diameter is nominally 0.14 inches smaller).
  • [0024]
    The inward slope of the inner surface 16′ of wall 16 (for example, nominally 6.25 degrees in some cups and 5 degrees in others), and the dimensions of cup wall 16 and inclined wall 24 of channel 18, are arranged so that the lowermost inner corner 26 of channel 18 will come into contact with the inner surface 16′ of cup wall 16 before the lid 12 is fully seated on the top of rim bead 14. In addition, the largest unstressed diameter inside the curvilinear portion 22 of channel 18 is typically selected to be 3.50 inches, a dimension approximately 0.04 inches less than the nominal largest diameter of rim bead 14. This arrangement provides a negative (or interference) snap fit of the channel 18 over rim bead 14. Thus, as the lid 12 is placed on cup 10, the lower edge of a skirt region 32 (e.g. 3.55 inch diameter) of lid 12 passes over rim band 14 until sloped transition region 28 engages rim band 14.
  • [0025]
    Skirt region 32 is then bowed outwardly as pressure is applied to the top of lid 12 until undercut 30 snaps over rim band 14 of the cup 10. As additional pressure is applied around the entire top of lid 12, the inner surface 22 of the upper curvilinear region of channel 18 seats along the top of rim bead 14 and the lowermost corner 26 of inclined wall 24, along with a portion of wall 24, forms an interference or plug fit seal against the inner surface 16′ of wall 16 of cup 10.
  • [0026]
    It should be noted that the height from the lowermost corner 26 of wall 24 to the upper curvilinear portion 22 of channel 18 is arranged, in combination with the several diameters mentioned, to provide the desired result of a leak resistant seal between cup 10 and lid 12.
  • [0027]
    Proceeding radially inwardly from the lowermost corner 26 of wall 24, in the embodiment shown in FIGS. 2 a-3, a substantially flat, concentric reinforcing web or flange 36 extends radially inwardly from channel 18 towards the center of lid 12 to a lower extremity of an inwardly inclined upstanding outer wall 38 of a central plateau region 40. As shown in FIGS. 2 b and 2 c, wall 38 extends from the lowermost to above the uppermost extremity of sealing channel 18 (and rim bead 14) so that plateau region 40 is displaced vertically above sealing channel 18. The top surface 42 of plateau region 40 may be inclined as shown in FIG. 2 b. A downwardly extending eccentric wall 44 extends from the top surface 42 to a closed center web section 46 of lid 12. Center web section 46 may be flat, concave or convex but preferably is concave as shown. The top surface 42 of plateau region 40 is provided with a drinking orifice 48 shown as an oval hole in the highest and widest region of plateau region 40. As should be apparent from FIG. 2 b, this location of orifice 48 provides a maximum height and width for the portion of plateau 40 from which liquid is emitted to the person drinking from the cup 10. The orifice 48 may therefore be sized appropriately for comfortable consumption of the liquid.
  • [0028]
    Taking into account the necessary height for wall 24 in order to provide a good seal around channel 18, stiffening or reinforcing members such as hollow domes 34 (FIGS. 2 a-3) or hollow elongated ridges or ribs 34′ (FIGS. 5 a-6) molded in the radially extending flange 36, or their equivalent, are provided to prevent deformation of the flange 36 and to maintain the required diameter at the lowermost corner 26 (or 26′) for a continuous interference fit when the lid 12 is plug fit into cup 10.
  • [0029]
    In an alternative embodiment of the invention shown in FIGS. 5 a-6, reference numbers for corresponding elements are numbered the same as in the preceding figures but are followed by a ′ (prime symbol). The alternative arrangement also illustrates a different set of dimensions for use in connection with a cup having a maximum diameter at its top of 3.66 inches and a rim bead of 0.18 inches. As can be seen by referring to FIGS. 5 a-6, certain of the elements shown in those figures are eccentrically positioned to a greater extent than is the case in the embodiment shown in FIGS. 3 a-4. One result of such greater eccentricity is that reinforcing flange or web 36′ occupies a greater area than the area occupied by reinforcing flange 36 in the FIG. 3 a-4 embodiment. This is particularly evident in the portion of reinforcing flange 36′ which is diametrically opposite the portion thereof between the drinking orifice 48′ and the outer edge of lid 12′.
  • [0030]
    In order to maintain a desired stiffness in flange 36′ so as to hold wall 24′ of lid 12′ in firm, sealing relationship against the adjacent inner surface 16′ of cup 10, the reinforcing dimple members 34′ are elongated radially to the form of ribs of increasing length proceeding circumferentially away from drinking orifice 48′. It should be noted that, in at least a portion of the flange 36′, where the horizontal dimension of flange 36′ may be small, the upstanding walls adjacent the flange are close to each other and there is no need (or space) for the reinforcing dimples, domes or ribs.
  • [0031]
    It should also be noted that the embodiment shown in FIGS. 5 a-6 also includes an elongated skirt having an additional transition member 50′ which will bring the lowermost member 32′ of the skirt further outward and along the side of cup 10.
  • [0032]
    Significant advantages of a lid according to the present invention are realized from the inside plug fit of the innermost wall of the sealing channel and cup wall, the relatively long single or multiple step outside skirt and the radial reinforcing slots or dimples in the reinforcing flange which maintain the sealing channel in contact with the cup wall. That is, the radial slots/dimples provide added interior support for the plugged lid surface and assist in holding the plug fit surface area of the lid in contact with the cup wall surface. The deep inside plug fit provides added surface area contact with which to seal the lid surface to the cup wall surface, thus preventing leakage between the surfaces. The outer skirt design, in conjunction with the reinforced deep plug, allows higher rim to lid interference levels which assist in preventing distortion on the outer portion of the lid, while applying more pressure to the cup rim.
  • [0033]
    The desired results are a greater lid to cup rim contact area, thus suppressing the flow of liquid between the lid and cup rim.
  • [0034]
    In view of the foregoing description, numerous modifications and alternative embodiments of the invention will be apparent to those skilled in the art. Accordingly, this description is to be construed as illustrative only and is for the purpose of teaching those skilled in the art the best mode of carrying out the invention. Details of the structure may be varied substantially without departing from the spirit of the invention.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3206059 *Sep 13, 1962Sep 14, 1965Hudson Pulp & Paper CorpContainer lid
US3246786 *Feb 3, 1964Apr 19, 1966Holley Plastics CompanyCoaster-cup lid
US3362575 *Oct 1, 1964Jan 9, 1968Union Carbide CorpPlastic container for materials in bulk
US3598271 *May 29, 1969Aug 10, 1971Holley Plastics CoCombination disposable cup lid and coaster
US4026459 *Jun 19, 1975May 31, 1977American Can CompanyPlastic container closure
US4421244 *Sep 8, 1981Dec 20, 1983Amhil Enterprises Ltd.Plastic lid for containers
US4441624 *Jan 20, 1983Apr 10, 1984Bronislaw SokolowskiDrinking cover
US4629088 *Mar 11, 1985Dec 16, 1986Handi-Kup CompanyContainer lid with drink-through opening
US5253781 *Jun 29, 1992Oct 19, 1993James River Corporation Of VirginiaDisposable drink-through cup lid
US5398843 *Dec 2, 1993Mar 21, 1995Letica CorporationDrink-through lid for disposable cup
US5460286 *Aug 4, 1993Oct 24, 1995James River Corporation Of VirginiaBeverage cup lid having an annular flange extension for increased cap retention force, and method of manufacture
US5624053 *Jun 6, 1995Apr 29, 1997James River Corporation Of VirginiaDrink-thru cup lid
US5798079 *Aug 20, 1996Aug 25, 1998Fort James CorporationMethod and apparatus for forming drink-thru cup lids
US5839601 *Dec 18, 1996Nov 24, 1998Amhil EnterprisesDisposable dome lid for drinking cups
US5860552 *Nov 10, 1997Jan 19, 1999International Paper CompanySelf righting liquid container
US5996837 *Jul 30, 1997Dec 7, 1999Fort James CorporationMethod and apparatus for forming drink-thru cup lids
US6079588 *Oct 26, 1999Jun 27, 2000Khafizov; MichaelResealable container cover
US6419105 *Sep 26, 2000Jul 16, 2002Bruce-Warrer Development CorporationSpill resistant lid with openable and closeable drinking opening
US6419112 *Jun 1, 2000Jul 16, 2002Farmarte, LlcSpill resistant lid
US6488170 *Nov 17, 2000Dec 3, 2002Tim Johnson Design, Inc.Disposable, rolled rim container and dome-shaped cover
US6505753 *Mar 30, 1999Jan 14, 2003Fort James CorporationCup lid having combined straw slot depression and tear back lid retainer
US6523712 *Sep 22, 2000Feb 25, 2003Mcgushion Aaron PaulFluid discharge reducing beverage closure
US6612456 *Oct 12, 2000Sep 2, 2003Wincup Holdings, Inc.Drink-through cup lid having selectively inwardly and outwardly rotatable hinged portion
US6874649 *Jun 7, 2002Apr 5, 2005Solo Cup CompanyLid
US20020096530 *Jan 19, 2001Jul 25, 2002Waller David B.Lid for beverage container
USRE28797 *Jul 30, 1975May 4, 1976Solo Cup CompanyLid
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7318536 *Aug 23, 2005Jan 15, 2008Berry Plastics CorporationDrink cup and lid
US7484639Feb 13, 2006Feb 3, 2009Berry Plastics CorporationDrink cup and lid
US7691302May 9, 2006Apr 6, 2010Prairie Packaging, Inc.Disposable cup lid
US7789260May 9, 2006Sep 7, 2010Prairie Packaging, Inc.Disposable cup lid
US7819271Nov 13, 2006Oct 26, 2010Prairie Packaging, Inc.Disposable cup lid
US7963416 *Apr 30, 2008Jun 21, 2011Target Brands, Inc.Food package with lid
US8074831 *Jul 25, 2007Dec 13, 2011Berry Plastics CorporationDrink cup and lid
US8215514Apr 21, 2011Jul 10, 2012Target Brands, Inc.Lid and container
US8317050Sep 23, 2010Nov 27, 2012Pactiv LLCDisposable cup lid
US9051089Oct 23, 2007Jun 9, 2015Berry Plastics CorporationDrink cup and lid
US20050274727 *Aug 23, 2005Dec 15, 2005Maravich Milan CDrink cup and lid
US20060113313 *Feb 13, 2006Jun 1, 2006Berry Plastics CorporationDrink cup and lid
US20060243734 *Apr 28, 2005Nov 2, 2006Tedford Richard A JrAsymmetric lid for use with an open-top container
US20060255037 *May 9, 2006Nov 16, 2006Prairie Packaging, Inc.Disposable cup lid
US20070012700 *Jun 14, 2006Jan 18, 2007Frederic CatteauPackaging comprising a container, a lid and a joint
US20080017651 *Jul 25, 2007Jan 24, 2008Berry Plastics CorporationDrink cup and lid
US20080041867 *Oct 23, 2007Feb 21, 2008Berry Plastics CorporationDrink Cup and Lid
US20080264947 *Apr 30, 2008Oct 30, 2008Target Brands, Inc.Food package with lid
US20090236409 *Feb 4, 2009Sep 24, 2009Amal FloresLid
US20110180560 *Apr 19, 2010Jul 28, 2011Chi-Jui HungCap for a cup
US20110200716 *Apr 21, 2011Aug 18, 2011Target Brands, Inc.Lid and container
US20120048856 *Nov 7, 2011Mar 1, 2012Berry Plastics CorporationDrink cup and lid
USD623474Sep 18, 2009Sep 14, 2010Wilton Industries Inc.Mug
USD623476Apr 29, 2010Sep 14, 2010Wilton Industries Inc.Mug
USD658443Nov 4, 2010May 1, 2012Wilton Industries Inc.Cup
USD667262Jul 8, 2011Sep 18, 2012Target Brands, Inc.Lid portion
USD729565Jan 24, 2014May 19, 2015Wilton Industries Inc.Dispenser
Classifications
U.S. Classification220/792, 220/713
International ClassificationA47G19/22, B65D43/02, B65D41/18
Cooperative ClassificationB65D2543/00537, B65D2543/00731, B65D2543/00564, B65D43/0208, B65D2543/00296, B65D2543/00518, B65D2543/00638, B65D2543/00046, B65D2543/00092
European ClassificationB65D43/02S3B
Legal Events
DateCodeEventDescription
Apr 7, 2004ASAssignment
Owner name: INTERNATIONAL PAPER COMPANY, CONNECTICUT
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BROWN, WILLIAM L.;CROWELL, TIMOTHY E.;HAASE, SARAH;REEL/FRAME:015194/0610
Effective date: 20040330