Abstract:
This invention relates to a closure arrangement for closing an opening in a base component. In particular—but not exclusively—this invention relates to a closure arrangement for a container, to serve as an openable lid for the container.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
   This application is a continuation of U.S. application Ser. No. 10/339,248, filed Jan. 9, 2003 now U.S. Pat. No. 6,942,118 which is a continuation of PCT International Application Serial No. PCT/US01/25222, filed Aug. 10, 2001. 

   FIELD OF INVENTION 
   This invention relates to a closure arrangement for closing an opening in a base component. In particular—but not exclusively—this invention relates to a closure arrangement for a container, to serve as an openable lid for the container. 
   BACKGROUND OF THE INVENTION 
   Many household products are supplied in a container having an opening to give access to the interior of the container, together with a lid to close that opening. Many such containers require two hands to remove the lid but for some products, it is desirable that the container can be opened simply, just with one hand. For example, in the case of a container for wetted or moist tissues, a person wishing to use a tissue may well have soiled fingers and so will wish to gain access to the interior of the container holding the tissues in a quick and simple manner. On the other hand, the lid for the container, when closed, should substantially seal the container so as to prevent drying-out of the wetted tissues. 
   Particularly in the case of a container for wetted tissues, it is advantageous if the lid can be moved from its closed position to its opened position automatically, on being released by a simple one-touch action by a finger of a user. For example, such a container is described in EP-0952088-A. 
   It is an aim of the present invention to improve on the several known designs of closure arrangements for containers and so provide such an arrangement which can be operated effectively and reliably for the expected life of the container, and yet which is cheap and easy to manufacture, bearing in mind that the container will probably be thrown away when its contents have been exhausted. 
   SUMMARY OF THE INVENTION 
   Accordingly, the present invention provides a closure arrangement comprising a base component defining a closable opening, a closure for the opening and hinged to the base component for movement between closed and open positions, juxtaposed lugs provided respectively on the base component and the closure in the region of the hinging axis of the closure, each lug having at or adjacent its free end a receptor, and an elastic link located in and extending between the receptors of the lugs, the receptors of the lugs being off-set from the hinging axis and arranged such that the link is strained when the closure is at its closed position, the straining of the link varying as the closure is moved between its closed and open positions and is least when the closure is at its open position. 
   It will be appreciated that the closure arrangement of this invention may be manufactured by a moulding operation using suitable plastics materials, except perhaps for the elastic link. Both the base component and the closure may be configured to be relatively simple items so as to be cheap to manufacture in large quantities and yet able to give reliable operation when in use. 
   Though it would be possible for there to be only one lug on the base component and only one lug on the closure, preferred embodiments of this invention have a single lug on one of the base component and the closure and on the other of the base component and closure a pair of spaced apart lugs so that the single lug is disposed therebetween. For such an arrangement, the elastic link may be strained between the pair of lugs and be deflected from a straight-line path by means of the single lug engaged substantially centrally with the link. 
   The elastic link preferably takes the form of a strip of elastomeric material moulded to have an enlarged head at each of its two ends respectively and which heads in use engage the respective lugs. Preferably, the strip of elastomeric material is of substantially circular cross-sectional shape. Each receptor may comprise a generally U-shaped recess formed in an end portion of each lug, which recess has a sufficient width to receive the strip of elastomeric material but the head of the strip serving to prevent the strip pulling out of the receptor transverse to the plane of the lug. 
   Preferably, a catch mechanism is provided to maintain the closure in its closed position, against the action of the strained link. Such a catch mechanism may comprise a catch member hinged to the base component and a tab provided on the closure which tab is engageable with the catch member so as to retain the closure in its closed position. Hinging of the catch member away from the tab will then release the closure to permit it to move to its open position, under the action of the elastic link. Such a releasing action may easily be performed by a single finger of a user so facilitating easy access to the contents of a container associated with the closure arrangement. 
   In an alternative embodiment, the arrangement of the lugs respectively on the base component and the closure is such that the straining of the elastic link initially increases on moving the closure from its closed position to its open position, before reducing to its smallest value with the closure at its open position. Such a closure arrangement will have an over-centre feel but may still be released easily so as automatically to move to its open position, merely by lifting the closure slightly. 
   Preferably, the closure arrangement of this invention is used in association with a container, the base component forming a part of a lid assembly for that container. Such a container may hold wetted or moistened sheets or tissues removable from the container through the opening in the base component. In this case, the closure when in its closed position may effect a generally air-tight seal to the base component, to minimise any drying of the moistened or wetted sheets within the container. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     By way of example, certain specific embodiments of this invention will now be described in detail, reference being made to the accompanying drawings in which:— 
       FIG. 1  is an isometric rear view of a first closure arrangement, with the closure separated from the base component; 
       FIG. 2  is a view similar to that of  FIG. 1  but with the closure fitted to the base component; 
       FIG. 3  is a sectional view through the arrangement of  FIGS. 1 and 2  taken generally on the hinging axis of the closure; 
       FIGS. 4 ,  5  and  6  correspond to  FIGS. 1 ,  2  and  3  respectively, but showing a second embodiment; 
       FIG. 7  corresponds generally to  FIG. 2 , but shows a third embodiment of this invention; 
       FIG. 8  shows a catch mechanism used with the first, second and third embodiments of this invention; 
       FIGS. 9A ,  9 B and  9 C are cross-sections through the hinge region of the embodiment of  FIGS. 1 to 3 ; and 
       FIG. 10  is a view similar to that of  FIG. 9A , but of an alternative over-centre arrangement. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Referring initially to  FIGS. 1 to 3 , there is shown a first embodiment of closure arrangement of this invention and comprising a base component  15  defining an opening  16 , and a closure  17  pivoted to the base component  15  for movement between an open position and a closed position (shown in  FIG. 2 ) where the closure closes the opening  16 . Both the base component  15  and the closure  17  are moulded from a plastics material. The lower region of the base component  15  may be configured for mounting on a lid of a container, over an aperture through that lid. In the alternative, the base component  15  may itself form the lid for a container with which the closure arrangement is to be associated. Yet another possibility would be for the base component  15  to be formed integrally with or attached directly to a container. 
   Around three sides of the opening  16 , the base component  15  is provided with an in-turned flange  18 , that flange on the two sides having aligned holes  19 , adjacent the rear wall  20  of the base component  15 . A curved wall  21  extends inwardly of the opening  16  from the rear wall  20 , curving upwardly towards the top face of the base component  15 . A lug  22  projects upwardly from this curved wall  21 , midway along the length of the rear wall  20 , the lug  22  having a U-shaped slot  23  at its upper free end. 
   The closure  17  is of simple rectangular shape and is provided with a down-turned lip  25  around its periphery. For the sake of clarity, the lip has been omitted from the rear edge  26  of the closure in  FIGS. 1 and 2 , but is shown in  FIGS. 9A ,  9 B and  9 C, and has a curved form for interaction with the rear wall as the closure is opened. The closure  17  is dimensioned so that it is a snug fit within the opening  16  of the base component  15 , when in its closed position shown in  FIG. 2 , giving a generally moisture-tight seal. 
   Projecting outwardly from the lip  25  at two opposed locations adjacent the rear edge  26  of the closure  17  are aligned pivot pins  27 , arranged to be received in the aligned holes  19  of the base component  15 , so allowing the closure  17  to pivot between the closed position shown in  FIG. 2  to an open position shown in  FIG. 9C . The under-surface of the closure  17  is provided with a pair of spaced lugs  28 , disposed equidistant from the side edges of the closure and each having a U-shaped slot  29  formed in its free end. Stretched between the lugs  28  is a link  30  of an elastomeric material (such as natural or synthetic rubber), the link  30  having a main portion  31  of circular cross-sectional shape and a respective head  32  formed at each of the two ends of the main portion  31 . As shown in  FIG. 1 , the link  30  should be lightly stretched when positioned between the pair of lugs  28  on the closure, so that the link will remain in position in the slots  29  by virtue of the tension in the link. Then, on engaging the pivot pins  27  with the holes  19 , as shown in  FIGS. 2 and 3 , the lug  22  on the base component  15  will engage the central part of the link  30  and strain that link so as to take up a generally V-shaped form. 
   With the closure  17  in its closed position, shown in  FIGS. 2 ,  3  and  9 A, the link  30  is strained to the greatest extent. Pivoting movement of the closure  17  from its closed position through an intermediate position ( FIG. 9B ) to its open position ( FIG. 9C ) reduces the straining of the link, with the included angle of the V-shaped form taken up by the main portion  31  of the link  30  reducing as the closure moves to its open position. Thus, the closure  17  will tend to move to its open position where the tension in the link  30  is at a minimum. 
   In  FIG. 3 , two retaining walls  33  are shown, disposed outside the pair of lugs  28  and spaced therefrom. These walls serve to assist holding of the link  30  in the slots  29  of lugs  28 , by having each head  32  of the link a friction fit between the wall  33  and the opposed face of the link. These walls may be omitted, as shown in  FIGS. 1 and 2 , if the link is sufficiently strained when carried in the pair of lugs  29 , before the closure is engaged with the base member. 
   In order to maintain the closure  17  in its closed position, a catch mechanism  34  as shown in  FIG. 8  is employed. This catch mechanism includes an L-shaped catch member  35  which is pivoted at  36  to the base component  15 , so as to be movable between a holding position shown in solid lines in  FIG. 8  and a released position shown in broken lines in that Figure. The closure  17  is shown diagrammatically at  37  in  FIG. 8 , but in the arrangement of  FIGS. 1 and 2 , there is a forwardly-projecting tab (not shown) on the closure  17  and below the upper surface of that closure, so that the upper surface  38  of the catch member  35  may lie in substantially the same plane as the upper surface of the closure  17 . 
   Though in  FIG. 8  a simple pivot  36  is shown for the catch member  35 , preferably the pivot is defined by a moulded film hinge which will urge the catch member to its holding position, movement of the catch member to its released position being against the force provided by the film hinge. The forward edge  39  of the catch member should be raked as shown in  FIG. 8 , so as to permit the closure  17  (or the tab provided thereon) to ride over that edge  39 , deflecting the catch member  35  as necessary. Securing of the closure  17  in its closed position thus simply requires the closure to be pushed to that position. Then, the closure may be released by a simple one-touch operation, pressing on the upper surface of the catch member  35 . 
     FIGS. 4 ,  5  and  6  show a second embodiment of this invention but which is generally similar to the arrangement of  FIGS. 1 to 3 . Consequently, like parts are given like reference numerals and those parts will not be described again here. 
   The second embodiment of  FIGS. 4 to 6  differs from that of  FIGS. 1 to 3  in that the closure  17  is provided with only a single downwardly-projecting lug  40 , disposed centrally of the closure adjacent its rear edge  26 . Conversely, the base component  15  has a pair of spaced lugs  41  the upper edges of which are on the same level as the upper edge of the curved wall  21 . In this embodiment, the elastic link  30  is strained between the lugs  41  and the lug  40  on the closure engages a central region of the main portion  31  of that link, to deform the link into a generally V-shaped form when the closure is in its closed position, as shown in  FIGS. 5 and 6 . In other respects, the embodiment of  FIGS. 4 to 6  operates as has been described above with reference to  FIGS. 1 to 3 . 
     FIG. 7  shows a third embodiment of this invention. In this embodiment, the base component  43  has a generally rounded profile to enhance the aesthetic appearance thereof, as compared to the base component  15 , but otherwise generally corresponds to that base component  15 . However, in this embodiment both the base component  43  and the closure  17  are provided only with one lug  44  and  45  each, those lugs being disposed equally to either side of the centre line of the closure  17 . A shorter elastic link  46  is provided than in the case of the embodiments of  FIGS. 1 to 6 , but the link is generally of the same form as link  30  and operates in the same manner. In other respects, the embodiment of  FIG. 7  is essentially the same as the first two embodiments, described above. 
   It will be appreciated that with the embodiments of  FIGS. 1 to 7 , the axis of pivoting movement of the closure  17  (that is, the axis of the holes  19  and pivot pins  27 ) is disposed slightly to the rear of the slots in the lugs of the closure and base component, as shown in  FIG. 9A . This ensures that the link is strained to its greatest extent when the closure is in its closed position, with the straining of the link reducing as the closure is moved to its open position. The position of said axis relative to the lugs may be adjusted to control the rate of change of the force of the link. If that axis is moved sufficiently forwardly to lie just in front of the link with the closure in its closed position, there will be imparted to the mechanism an over-centre (or toggle) action; such an arrangement is shown in  FIG. 10 . With this arrangement, the straining of the link increases for the first few degrees of opening movement of the closure, whereafter the action proceeds as described above, with the straining reducing until the closure is in its opened position. The result is that the closed position of the closure is stable and the closure will move automatically to its open position only after raising the closure through a few degrees. This then permits the elimination of the catch mechanism  34  whilst still giving a simple and easy to operate one-touch action, of just raising the closure by a few degrees at its forward edge. 
   All documents cited in the Detailed Description of the Invention are, in relevant part, incorporated herein by reference; the citation of any document is not to be construed as an admission that it is prior art with respect to the present invention. To the extent that any meaning or definition of a term in this written document conflicts with any meaning or definition of the term in a document incorporated by reference, the meaning or definition assigned to the term in this written document shall govern. 
   While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.