Abstract:
The present invention provides a resealable closure system that may be incorporated into a container for storing and dispensing moisture sensitive product, such as a dry wiping substrate and more preferably a dry wipe useful for facial cleansing or the application of make-up. The closure system is not only resealable, but is also substantially watertight as a result of the lid having a sealing flange and an overhang.

Description:
BACKGROUND 
     Containers suitable for dispensing wiping substrates, both dry and wet, are known in the art. Containers typically are either flexible or rigid and include a dispensing orifice to allow the consumer convenient access to the substrate. In the containers of the prior art these openings are generally situated on the upper face of the container. In order to prevent egress of moisture in the case of wet wiping substrates or the ingress of moisture in the case of dry wiping substrates, known containers generally comprise a lid and a sealing device. 
     A problem with containers of the prior art is that the sealing device often makes it difficult for the consumer to access the wipes within the container. The sealing device may make it difficult for a consumer to open and close the lid or may obscure the dispensing orifice and impede dispensing. The sealing device may also make it difficult to dispense multiple wipes at one time. For example, the sealing device may only permit access to a single wipe, making it difficult to quickly dispense multiple wipes without damaging the wipes, damaging the container or abrading the skin against the edges of the container. 
     In addition to making dispensing more difficult, sealing devices of the prior art often increase the complexity and cost of the container. For example, U.S. Pat. No. 7,213,720 provides a cap assembly for storing and packaging moisture-sensitive items, however, the cap includes a lip seal member that must be aligned with an opposing skirt and must be positioned so as to apply pressure to the skirt. Further, an elastomeric liner may be positioned between the skirt and the lip to improve the water-tightness of the seal. Such a design increases the complexity of both the lid and the skirt, introduces additional materials in the form of an elastomeric liner and negatively effects dispensing by introducing additional features to the dispensing orifice. 
     It is therefore an objective of the present invention to provide a rigid container from which a dry wiping substrate can be easily dispensed, while also providing a means for preventing the ingress of water in a simple and cost effective manner. 
     SUMMARY 
     The present invention provides a resealable closure system that may be incorporated into a container for storing and dispensing moisture sensitive product, such as a dry wiping substrate and more preferably a dry wipe useful for facial cleansing or the application of make-up. The closure system is not only resealable, but is also substantially watertight. That is, when the closure system is integrated with a container, the closure system substantially prohibits the ingress of water into the container through the lid when the lid is in a closed position. 
     Accordingly, the present invention solves the problem of providing a simple, cost effective and functional watertight closure system by providing a lid having a pair of downwardly extending flanges disposed along each side edge, the flanges extending beyond the base of the closure system when the lid is in a closed position, and a front edge that extends horizontally beyond the vertical plane of the front edge of the base when the lid is closed. These three components (pair of side flanges and overhanging front edge), which are preferably integral to the lid and made form the same material, effectively prevent the ingress of water and allow for the dry storage of wiping substrates even when the container is stored in a wet environment, such as a shower. 
     In one embodiment the present invention provides a lid attached to a base member by a hinge. The lid, which is preferably rectangular, although it may be any shape, comprises a pair of downwardly extending flanges and a front edge that forms an overhang. When the lid is in a closed position the flanges extend beyond the upper edge of the base member and the overhang extends beyond the front edge of the base member. 
     In another embodiment the present invention provides a closure system comprising a base having a front edge, a rear edge and a pair of opposed side edges; a lid having a front edge, a rear edge, a pair of opposed side edges and a pair of flanges extending at least partially along each of the side edges, the flanges extending substantially vertically downward from the horizontal plane of the lid; and a hinge that operatively connects the lid to the base in a movable arrangement, wherein the front edge of the lid extends beyond the vertical plane of the front edge of the base when the lid is in a closed position. 
     In still another embodiment the present invention provides a container comprising a cup-shaped container body having a bottom and a generally annular sidewall defining an open end; a lid having a main body having opposed front and back edges and opposed side edges, the lid sized large enough to close the open end of the container body, a pair of sealing flanges extending from a bottom surface of the main body and beyond the annular sidewall in a closed position, the lid further comprising an overhanging front edge that extends beyond the annular sidewall in a closed position; a living hinge coupling the container lid and container body into a one-piece construction, the container lid pivoting through the living hinge between an open position and the closed position. 
     In yet other embodiments the present disclosure provides a watertight dispenser comprising a container body having a bottom and a generally annular sidewall defining an open end and a closure system sized to cover the open end of the container, the closure system comprising a base, a lid and a hinge, wherein the lid comprises a pair of sealing flanges that extend downward from the horizontal plane of the lid and beyond the base and an overhanging front edge that extends beyond the vertical plane of the front edge of the base when the lid is in a closed position. 
     Other features and embodiments of the present invention are discussed in greater detail below. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
       Various non-limiting embodiments are further described with reference to the accompanying drawings in which: 
         FIG. 1  illustrates a front view of a closure system engaged with a container according to one embodiment of the present invention; 
         FIG. 2  illustrates top view of a closure system according to one embodiment of the present invention; 
         FIG. 3  illustrates a cross section view of a portion of a lid (through line C-C of  FIG. 1 ) according to one embodiment of the present invention; 
         FIG. 4  illustrates a cross section view of a lid (through line B-B of  FIG. 1 ) according to one embodiment of the present invention; 
         FIG. 5  illustrates a cross section view of a closure system (through line A-A of  FIG. 1 ) according to one embodiment of the present invention; and 
         FIG. 6  illustrates a side view of a closure system engaged with a container according to one embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Various embodiments or features are described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the subject disclosure. It may be evident, however, that the disclosed subject matter can be practiced without these specific details, or with other methods, components, materials, and so forth. 
     By way of introduction, the present invention provides a watertight closure system comprising a lid, a hinge and a base member. The base member may either be a container having a bottom and a generally annular sidewall defining an open upper portion or may simply be an annular sidewall having open top and bottom portions that may be coupled with, or otherwise joined to, a container. When the lid is in a closed position, the lid, hinge and base member form a closure system that prevents the ingress of water. In this manner, the system may be used as a closure system for a container of dry, disposable, personal cleansing articles which may be useful for cleansing the skin or hair and/or delivering skin or hair care actives to the skin or hair. Generally such articles are used by the consumer by wetting the dry article with water. Prior to use however, it is desirable to maintain the articles in a dry state. Therefore, it is preferred that the articles be stored in a container having a lid that prevents the ingress of water. 
     For example, in one embodiment the closure system is integrated with a container having a bottom and a generally annular sidewall defining an open upper portion upon which the bottom surface of a lid seats when the lid is in the closed position. Further, when the lid is in a closed position, the front edge of the lid extends beyond the horizontal plane of the annular sidewall thereby defining an overhanging front edge. The lid also comprises a sealing flange that extends downward from the lid and beyond the vertical upper portion of the container. In this manner the lid includes elements along its periphery that prevent ingress of water into the container and allow the contents thereof to remain dry even when the container is stored in a moist environment such as a shower. 
     Turning to the figures,  FIG. 1  illustrates a closure system  10  according to one embodiment of the present invention. The closure system comprises a lid  20  and a base member  60 , which are preferably joined by a hinge (not illustrated in  FIG. 1 ). As noted previously, in certain embodiments the closure system  10  may be affixed to a container  100 , such as a container for storing and dispensing dry wiping products. The base member  60  and lid  20  are shown to be of a somewhat square-like (i.e., four-sided) or generally rectangular shape and are generally complementary to the shape of the container in-use. However, other shapes and configurations of the base and lid, such as round or circular, are contemplated and are intended to fall within the scope of the invention. The invention is not to be limited to a specific base or lid perimeter shape or overall contour. 
     In general, the lid  20  is sized to fit over the base member  60  during use. Further, the base member  60  is preferably configured to receive the lid  20  when it is in a closed position and the lid  20  is configured to be positioned over the base member  60  in a manner that forms a seal there between and prevents the ingress of water. 
     In accordance with certain embodiments, the base member  60  and the lid  20  can be made of the same material or of a similar material. In some embodiments, the base member  60  and the lid  20  are formed of different materials. According to certain embodiments, the base member  60  and/or the lid  20  are formed of an injection molded suitable thermoplastic material (e.g., polymer, polypropylene, and so forth) or other material known in the art. 
     The base member  60  and the lid  20  can be a one-piece structure or the base member  60  and lid  20  may comprise a two-piece structure. Regardless, the lid  20  is preferably pivotally joined to the base member  60  by, for example, a hinge  40 . The hinge  40  can be configured to mitigate cracks that might develop at or along one or more flex portions of the hinge  40  and can be constructed of a relatively thin wall that is configured to flex without breakage during an expected service life of the closure system  10 . For example, the hinge  40  can be formed of a material that has at least some flexibility and/or that can deform slightly or significantly in order to mitigate cracking and/or breakage of the hinge  40 . In accordance with some embodiments, the hinge  40  can be formed with the same or similar material as the base member  60  and/or the lid  20 . In other embodiments, the hinge  40  can be formed of a material that is different than the material used to form the base member  60  and/or the lid  20 . 
     The hinge can be a “living hinge”, a “pivoting hinge”, or another type of hinge. A living hinge is a hinge formed with the base member  60  and the lid  20  as a single piece. A living hinge can be configured to facilitate the lid  20  being able to spring away from the base member  60  when the closure system  10  is to be opened. A pivoting hinge is formed at substantially the same time as the body portion (or the lid), wherein the body portion and the lid  20  are formed as separate pieces and snapped together at the hinge to combine the two pieces into a single container assembly. 
     The hinge  40  provides ease of moving the lid  20 . For example, the hinge  40  operatively connects the lid  20  to the base member  60  in a movable arrangement, wherein the lid  20  comprises at least two positions, namely, a first position and a second position. When in the first position, the lid  20  is “open” (or moved away from the base member  60 ), which allows product (e.g., a specimen) to be placed into the closure system  10  (e.g., into the base member  60 ) and/or dispensed from the closure system  10 . When the lid  20  is in the second position, the lid  20  is closed or engaged with the base member  60 , providing a secure and watertight seal according to various embodiments disclosed herein. Thus, the hinge  40  allows the lid  20  to be moved away from the base member  60  (e.g., flipped up, placed into first position) for dispensing and/or for filling. The hinge  40  can allow the lid  20  to be moved into contact with the base member  60  (e.g., placed into the body position) for storage, transport purposes, and/or for other purposes. 
     In a particularly preferred embodiment, such as that illustrated in  FIG. 2 , the lid  20  is formed with the base member  60  as a one-piece construction and is not formed as a plurality of parts separately attached together. The two components are joined by a living hinge  40  that attaches the lid  20  to the base member  60 . The living hinge  40  allows the lid  20  to pivot relative to the base member  60  between open and closed positions while permanently securing the lid  20  to the base member  60 . In certain embodiments the closure system may be combined with a container such that when the lid is in an open position the contents stored within the container can be accessed. In a preferred embodiment, the closure system forms a water tight seal relative to the container body in the closed position. Permanently attaching the lid  20  to the base member  60  provides the additional benefit that the lid cannot be lost or displaced from the base. 
     Ordinarily, the lid  20  is installed upright on the top of the base member  60  that has a mouth  62  that typically lies in a horizontal plane. For purposes of discussion, the vertical direction generally corresponds to an axial direction with reference to the geometry of the closure system (comprising the body portion and the lid) and the horizontal direction or horizontal plane is perpendicular to the axial direction of the closure system (e.g., the vertical direction). It should be understood that during fabrication, molding, shipping, storage, and so forth, the base member  60  and/or lid  20  could have a non-upright orientation. 
     As illustrated in  FIG. 2 , the base member  60  annular sidewall  74  defines an open upper end  68 . As further illustrated in  FIG. 4 , the annular sidewall  74  has upper  70  and lower  72  edges. The upper edge  70  defines the upper horizontal plane  75  of the base member  60  and the lower edge of the annular sidewall  74  defines the lower horizontal plane  71  of the base. The base member  60  is substantially rectangular and has a pair of opposed side walls  64 ,  66  and opposed front and back walls  63 ,  65 . 
     The lid  20 , which is generally shaped to cover the base member  60  has a main body  26  having a generally annular shaped peripheral edge that comprises front  21 , rear  23  and opposing side edges  25 ,  27 , which together form the outer peripheral edge of the lid. 
     As illustrated in  FIGS. 1 and 4 , extending downwardly from each side edge  25 ,  27 , in a direction substantially perpendicular to the plane of the main body  26 , are a pair of sealing flanges  30 ,  32 . The sealing flanges  30 ,  32  are illustrated in detail in  FIG. 4 , which is a cross section view of a lid. The sealing flanges  30 ,  32  may be considered part of the lid  20 . The sealing flanges  30 ,  32  extend axially from the main body  26  and more particularly from the bottom surface  28  of main body  26 . 
     When the lid is in a closed position, the sealing flanges  30 ,  32  generally extend in an axially downward direction from the lid  20  beyond the horizontal plane  75  of the base. In this manner the sealing flanges  30 ,  32  form a seal along at least a portion of both side edges  64 ,  66  and prevent the ingress of water. When the sealing flanges are employed with an overhang along the front edge of the lid, as described in more detail below, there is no need for additional seals between the base member and the lid. The combination of sealing flanges and overhang provide a simple and effective means of preventing water from entering the closure system. 
     The flanges  30 ,  32  may be any suitable shape, so long as they extend substantially vertically from both edges  25 ,  27  of the lid  20  towards the base member  60 . In a particularly preferred embodiment the sealing flanges are preferably wedge shaped such that it has a wider base portion proximate main body and a narrower distal tip spaced axially away from main body. 
     In one particularly preferred embodiment of a sealing flange, the outer surface of the flange is radially shaped having a radius from about 0.01 to about 0.1 inches. In other embodiments the outer surface of the flange may be canted inwards toward the base member when the lid is in a closed position. The inner surface is preferably substantially perpendicular to the horizontal plane of the main body forming an angle between about 90 and about 93 degrees. When the lid is in a closed position the inner flange surface is preferably parallel to the vertical plan of the base, but is spaced away from the base member such that there is a space between the inner flange surface and the base member. 
     While the sealing flange may generally be any size and shape so long as it seals the edges of the closure system when the lid is in a closed position, in a preferred embodiment the flange has a tapered shape. Accordingly, in one embodiment the flange base has a width of between about 0.03 and 0.1 inches (measured parallel to the bottom surface of main body) and a width of between about 0.02 and 0.05 inches at the distal tip. In a preferred embodiment, the height of the sealing flange is substantially constant the entire length of the sealing flange. Preferably, the flange has a height between about 0.1 and 0.5 inches and more preferably between about 0.2 and about 0.3 inches. 
     As illustrated in  FIG. 1 , the flanges  30 ,  32  extend downwardly from the side edge  25 ,  27  towards the base member  60  when the lid  20  is in a closed position. In this manner, the flanges  30 ,  32  extend vertically beyond the horizontal plane  75  of the base a distance of at least about 0.05 inches, such as from about 0.05 to about 0.25 inches. In a particularly preferred embodiment, such as the embodiment illustrated in  FIG. 1 , the flanges  30 ,  32  extend downwardly beyond the vertical plane  75  of the upper edge  70  of the base member  60  but do not contact the edge when the lid is in a closed position. In this manner there is a slight gap between the flanges  30 ,  32  and the base member  60 , such as from about 0.01 to about 0.1 mm and more preferably from about 0.05 to about 0.075 mm, as illustrated in  FIG. 1 . 
     The flanges  30 ,  32  extend at least partially along each side edge  25 ,  27 . More preferably the flanges  30 ,  32  extend along the entire length of each side edge  25 ,  27 . In a particularly preferred embodiment the flanges  30 ,  32  extend along the entire length of each side edge  25 ,  27  and at least partially along the rear edge  23 . In a particularly preferred embodiment, such as the embodiment illustrated in  FIG. 2 , the flanges  30 ,  32  extend along the entire length of each side edge  25 ,  27  and along a portion of the rear edge  23 , terminating immediately adjacent to the hinge  40 . In this manner, the flanges and the hinge prevent the ingress of water along the entirety of the side and rear edges. 
     The flanges  30 ,  32  may extend along the front edge  21 , however, as described below, the front edge  21  forms an overhang  38  and therefore there is generally not a need for additional barriers to the ingress of water along the front edge  21 . Thus, in a preferred embodiment the front edge  21  does not include a flange, but rather, the flanges  30 ,  32  terminate immediately adjacent to the front edge  21 . In those embodiments where the edges of the lid are joined by rounded corners, such as the embodiment illustrated in  FIG. 2 , the flanges may extend at least partially around the rounded corners. 
     In addition to having a pair of sealing flanges that extend beyond the horizontal plane of the upper edge of the base when placed in a closed position, the lid  20  includes a front edge  21  that extends beyond the front edge  63  of the base. In this manner the front edge  21  forms an overhang  38  that is substantially planer with the lid  20  and perpendicular to the vertical plane  77  of the base. Preferably the overhanging front edge  21  extends at least about 0.0.5 inches and more preferably from 0.1 to about 0.3 inches, beyond the vertical plane  77  of the base. Providing a lid edge that overhangs the base provides numerous advantages, such as providing a surface that is easy for the user to grasp when opening the lid and preventing the ingress of water along the front edge of the base. 
     In one preferred embodiment, the closure system comprises only one overhang, which is disposed along the front edge of the lid. In this manner the overhang  38  forms a drip edge to facilitate the flow of liquid off the lid  20  along its front edge  21 . As illustrated in  FIG. 6 , the top and bottom surfaces of the overhang  38  are generally parallel to one another and substantially parallel to the horizontal plane of the lid  20 . In alternate embodiments the overhang is curved generally downwardly to form a drip edge to facilitate the flow of liquid off the lid. Other cross-sectional shapes are also possible depending on the particular application in which lid will be used. 
     Turning again to  FIG. 5 , which is a cross section of  FIG. 2  through line A-A, a particularly preferred embodiment of a lid  20  is illustrated. In the illustrated embodiment the lid  20  has a central recessed or sunken section  36  surrounded by a vertical upstanding lid wall  29  that faces the recessed section  36 . In the disclosed example, the lid wall  29  has four side segments that correspond to the four-sided shape of the lid  20 . To receive the lid  20  the upper edge  70  of the base is provided with a lip  73  that extends radially outward. In this manner the downwardly extending wall  29  defines the peripheral edge of the central depressed portion  36  and the lip  73  defines the peripheral edge of the central open portion, or mouth  62  of the base. In a preferred embodiment the periphery of the central depressed portion  36  is slightly greater than the periphery of mouth  62  of the body so that at least a portion of the depressed central portion  36  contacts the lip  73  when the lid  20  is in a closed position. 
     In the above described embodiment when the lid is in a closed position the surfaces of the depressed central portion and the lip are parallel to one another and orientated substantially horizontally. Similarly, when the lid is in a closed position the surfaces of the downwardly extending wall and the upper peripheral wall of the base are parallel to one another and generally canted outwardly. 
     With reference again to  FIG. 2 , in one particularly preferred embodiment the base member  60  is defined by opposing side walls  64 ,  66  and front  63  and back  65  walls. As discussed previously, while the body shown in the drawings has a rectangular shape, the container of the present invention may have a circular or oval shape with only a peripheral upstanding wall. In a particularly preferred embodiment the front  63 , back  65  and side walls  64 ,  66  of the base member  60  are merged via rounded corners  67 , as shown in  FIG. 2 . In this manner, the front  63 , back  65  and side walls  64 ,  66  form a peripheral wall that defines the base member  60 . 
     Further details of one preferred embodiment of the base member  60  will now be discussed with reference to  FIG. 5 , which is a cross-section view of  FIG. 2  through line A-A-A. As shown in  FIG. 5 , the base member  60  is defined by a peripheral wall  74  having upper  70  and lower  72  edges. In the preferred embodiment illustrated in  FIG. 2 , the upper  70  and lower  72  edges lie at either end of a wall having three distinct segments a lower segment, which terminates at the lower edge  72 , a middle segment, and an upper segment, which terminates at the upper edge  70 . The middle segment preferably has a concave outer surface having a radius from about 0.3 to about 0.5 inches. The upper segment extends above and beyond the concave middle segment and generally parallel to the lower segment. 
     With further reference to  FIG. 5  and turning to the inner surface of the peripheral wall defining the base member  60 , illustrated is a central opening  62 , also referred to as a mouth, defined by a lip  73  extending substantially perpendicular to the peripheral wall and inwardly towards the opening  62 . Preferably the lip  73  extends along the entire interior of the peripheral wall and is recessed from the plane of the upper edge  70  simplifying the manufacturing process and allowing the lid  20  to overlie base member  60  when in a closed position. 
     The portion of the interior peripheral wall extending above and beyond the lip  73  is disposed at an angle of about 100 to about 140 degrees and preferably about 110 to about 120 degrees from the horizontal plane of the lip  73 . This slight angle facilitates the entry of a depressed central portion of the lid to enter the mouth and form an interference or sealing fit when the lid is in a closed position. 
     The base  60  can include a latch with an elongate first rib  81  projecting horizontally therefrom, and the lid  20  can include a catch with an elongate second rib  82  projecting horizontally therefrom. The first and second ribs  81  and  82 , respectively, can removably engage each other in an interference fit to maintain the lid closed and removably disengage each other when the lid is opened.