US20080264979A1 - Dispensing valve and a container for holding fluid provided with such a dispensing valve - Google Patents

Abstract

The invention relates to a dispensing valve (2) for dispensing fluid from a container, comprising a central member (20) provided with a flexible membrane (22) having at least one slit (23), a flange (40) surrounding the central member for attaching the valve to the container and connecting means for connecting the central member to the flange, which connecting means comprise a material hinge (25). The valve is deformable from a closed position to a dispensing position upon application of pressure to the fluid in the container. The central member is further provided with a support (26) for the flexible membrane, which support is more rigid than the flexible membrane and extends towards the container in the secured position of the dispensing valve, wherein the material hinge directly couples the support to the flange.

Description

TECHNICAL FIELD
• The present invention relates to a dispensing valve. Dispensing valves are commonly used for dispensing fluid from a container. Upon application of pressure to the fluid in the container the valve deforms such that it assumes its open or dispensing position and allows fluid to be dispensed from the container. Once the pressure is lifted, the valve automatically retracts to its closed position sealing the container off.
BACKGROUND OF THE INVENTION
• Dispensing valves improve the ease of use of fluid containers by allowing small quantities of fluid to be dispensed at a time, while leaving the dispensing opening of the container clean of fluid after use. In the closed position dispensing valves provide a reliable seal under all circumstances.
• Generally dispensing valves are suitable for use in a wide variety of containers or packages for dispensing all sorts of fluids. The term fluid is used herein to denote any product or medium capable of flowing. A non-limiting list of examples of fluids includes among others: beverages, food condiments, hygienic products.
• The dispensing valve for dispensing fluid from a container according to the invention comprises a central member provided with a flexible membrane having at least one slit; a flange surrounding the central member for attaching the valve to the container, and connecting means for connecting the central member to the flange, which connecting means comprise a material hinge, wherein the valve is deformable from a closed position to a dispensing position upon application of pressure to the fluid in the container.
• Such a dispensing valve is known from U.S. Pat. No. 6,769,577. The known dispensing valve is a self-closing valve wherein the connecting means comprise a connecting wall having a first area forming an annular section extending in the same plane as the flange or parallel to the flange. The connecting wall further has a second area extending upwardly in curved fashion at an obtuse angle, i.e. away from the container interior when the valve is affixed to the container. A transition zone of the connecting wall near the membrane is configured in hinge-like manner.
• One disadvantage of the known dispensing valve is that it has rather complex connecting means with relatively large dimensions for connecting the central member to the flange.
DISCLOSURE OF THE INVENTION
• It is an object of the present invention to provide a dispensing valve of the kind as mentioned above that has a simple and reliable design allowing easy and economical production.
• According to the present invention this object is achieved by a dispensing valve characterized in that, the central member is further provided with a support for the flexible membrane, which support is more rigid than the flexible membrane and extends towards the container interior in the secured position of the dispensing valve, wherein the material hinge directly couples the support to the flange.
• According to the present invention the connecting means are simple and reliable as they are formed by the hinge alone. The hinge takes up a minimal amount of space as it directly couples the support to the flange. Advantageously this leaves more room for the flexible membrane that may have larger radial dimensions. Additionally as the support is more rigid than the flexible membrane, it cooperates effectively with the hinge to deform the flexible membrane to the desired dispensing position. Furthermore as the support extends towards the container interior in the secured position of the dispensing valve the membrane is positioned inside the container interior and will remain there even when it deforms to the dispensing position.
• According to a practical preferred embodiment of a dispensing valve according to the invention the material hinge on the one side is located at the upper part of the flange and on the other side at the lower part of the support. By means of the position of the hinge the support now forms a pedestal for the flexible membrane. Preferably the material hinge on the one side is located at the inner upper edge of the flange and on the other side at the outer lower edge of the support.
• According to a first preferred embodiment a second material hinge is arranged on the central member. The second material hinge improves the functioning of the dispensing valve according to the invention. Initially, once the pressure is raised in the container, the second hinge assists in maintaining the shape of the central member, since it forms a weak point that deforms first under stress. Once the pressure is raised to a maximum value and the breaking point of the valve is reached, it will facilitate the sudden opening of the slit.
• In a preferred embodiment the second material hinge is located adjacent the support. In an elegant embodiment a first groove is arranged on the central member for forming the second material hinge.
• According to a second preferred embodiment a third material hinge is arranged on the central member between the second material hinge and the center of the flexible membrane.
• This third hinge will enhance the effect of the second hinge.
• In a preferred embodiment the third material hinge is arranged in the vicinity of the slit. In an elegant embodiment a further groove is arranged on the central member for forming the third material hinge.
• According to yet another preferred embodiment the support is thicker than the flexible membrane. Advantageously the support is more rigid in order to maintain a rather stable form, whereas the membrane is more flexible.
• The invention also relates to a container for holding fluid, provided with a dispensing valve according to the present invention.
• These and other features and advantages of the invention will be more apparent with a discussion of a preferred embodiment of the invention and reference to the associated drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
• The invention will be explained in more detail with reference to the appended drawings, in which:
• FIG. 1A shows a longitudinal cross section container provided with a preferred embodiment of a dispensing valve according to the invention;
• FIG. 1B shows an enlarged view of part ofFIG. 1A;
• FIG. 2A shows a cross-sectional view of a first embodiment of a dispensing valve according to the invention in closed position;
• FIG. 2B shows the dispensing valve ofFIG. 2A in open position;
• FIG. 2C shows a top view of the dispensing valve ofFIG. 2A;
• FIG. 2D shows a top view of the dispensing valve ofFIG. 2B:
• FIG. 3A shows a cross-sectional view of a second embodiment of a dispensing valve according to the invention in closed position;
• FIG. 3B shows the dispensing valve ofFIG. 3A in open position;
• FIG. 3C shows a variant of the second embodiment ofFIG. 3A;
• FIG. 3D shows the variant ofFIG. 3C in open position;
• FIG. 4A shows a cross-sectional view of a third embodiment of a dispensing valve according to the invention in closed position; and
• FIG. 4B shows the dispensing valve ofFIG. 4A in open position.
BEST MODE FOR CARRYING OUT THE INVENTION
• FIG. 1A schematically shows a longitudinal cross section of acontainer100 provided with a preferred embodiment of a dispensing valve according to the invention.FIG. 1B shows an enlarged view of part of thecontainer100 ofFIG. 1A. InFIG. 1B the container and the dispensing valve are shown in the dispensing orientation. The direction of fluid flow is indicated by arrow F. When the terms “upper” or “lower” are used throughout this description they refer to the dispensing orientation.
• Container100 comprises abody110 onto which acap120 is attached.Cap120 is provided with apreferred embodiment 2 of the dispensing valve. The preferred embodiment shown is thesecond embodiment 2 which will be described in detail below referring toFIG. 3A.Dispensing valve2 comprises acentral member20 that is surrounded by aflange40 for securing the valve in the container cap.
• Theflange40 is arranged to be assembled in a snap fit manner. Thereto theflange40 is provided with a raisededge41 for a snap fit engagement into a space with matching dimensions present in the interior of the cap of the container. Said space is formed between the lower edge of thecap121 andinner support122.
• In the following figures a number of preferred embodiments of the dispensing valve according to the invention are shown. All of them are provided with the same flange, but differ with respect to the central member.
• FIG. 2A shows cross-sectional view of a first embodiment of a dispensingvalve1 according to the invention in closed position.FIG. 2B shows the dispensingvalve1 in open position.
• Dispensing valve1 comprises acentral member10 that is provided with aflexible membrane12 having at least oneslit13. Aflange40 surrounds thecentral member10 for securing thevalve1 to a container (seeFIGS. 1A and 1B) and is connected to thecentral member10 by means of amaterial hinge15.
• Asupport16 for theflexible membrane12 forms part of thecentral member10. In the secured position of the dispensing valve thesupport16 is arranged such that it extends inwardly into the container. In the first embodiment shown thesupport16 in the closed position extends substantially parallel to the inner wall of the container. Thematerial hinge15 directly couples thesupport16 to theflange40.
• On the one side thematerial hinge15 is located at the upper part of theflange40, preferably at the inner edge thereof. On the other side thematerial hinge15 is located at the lower part of thesupport16, preferably at the outer edge thereof. The material hinge is formed by a substantially thinner part of the dispensing valve allowing the movement of the central member relative to the flange. The dimensions of the material hinge are preferably relatively small compared to those of the flange and the central member.
• Thecentral member10 has a radially outwardly increasing thickness. Thesupport16 is thicker than theflexible membrane12. The upper and lower surfaces of the central member are essentially flat. The corresponding tangent lines are converging under sharp angles. An angle A is defined between the tangent line of the top surface of theflexible membrane12 and the tangent line of the top surface of thesupport16. An angle B is defined between the tangent line of the top surface of theflexible membrane12 and the tangent line of the bottom surface of thesupport16. Angle A differs from angle B. An angle C is defined between the tangent line of the top surface of theflexible membrane12 and the tangent line of the bottom surface of theflexible membrane12. Angle C may differ from angle B.
• Once the fluid in the container is pressurized thecentral member10 deforms to its dispensing position shown inFIG. 2B. Thesupport16 is pushed outward and theslit13 opens automatically.
• FIG. 2C shows a top view of the dispensingvalve1 in closed position andFIG. 2D shows a top view of the dispensing valve in open position. As can be seen the shape of the dispensing valve preferably is generally round. The outer shape of the flange and the central member are generally cylindrical. The shape of the material hinge is in conformity therewith.
• FIG. 3A shows a cross-sectional view of a dispensingvalve20, which is a second embodiment according to the invention, in closed position.FIG. 3B shows the dispensingvalve20 in open position.
• Dispensing valve2 is largely similar to dispensingvalve1 described above. All reference numerals inFIGS. 3A and 3B are incremented with 10 when compared to the reference numerals ofFIGS. 2A and 2B denoting equal parts.
• In addition to dispensingvalve1dispensing valve2 is provided with asecond material hinge21 located on thecentral member20 adjacent the support26, between the support26 and theslit23.
• On the central member20 afirst groove24 is arranged for forming thesecond material hinge21. Typically the shape of thegroove24 will be in conformance with the outer circumference of the central member of the valve. Preferably thegroove24 is annular shaped.
• By means of the groove the support26 is divided into two segments,26A and26B that are coupled by thematerial hinge21.
• FIG. 3C shows a variant of the second embodiment ofFIG. 3A, wherein thegroove24 is located at the top surface of thecentral member20.
• Once the fluid in the container is pressurized thecentral member20 deforms to its dispensing position shown inFIG. 3B, respectively3D. The support26 is then pushed outward and in both embodiments thegroove24 narrows. Once the break through point is reached, theslit23 opens automatically.
• FIG. 4A shows a cross-sectional view of a third embodiment of a dispensing valve according to the invention in closed position.FIG. 4B shows the dispensing valve ofFIG. 4A in open position.
• Dispensing valve3 is largely similar to dispensingvalve2 described above. All reference numerals inFIGS. 4A and 4B are incremented with 10 when compared to the reference numerals ofFIGS. 3A and 3B denoting equal parts.
• In addition to dispensingvalve2dispensing valve3 is provided with athird material hinge37 arranged on thecentral member30 between thesecond material hinge34 and the center of theflexible membrane32. In the embodiment shown thehinge37 lies on theflexible membrane32 and runs through theslit33.
• On the central member30 afurther groove38 is arranged for forming thethird material hinge37. Typically the shape of thegroove38 will be in conformance with the outer circumference of the central member of the valve. Preferably thegroove38 is annular shaped.
• By means of the groove38 a further subdivision of the central element into three segments, roughly equal to36A,36B and32, is reached, which segments are coupled two-by-two by the material hinges31 and37.
• Once the fluid in the container is pressurized thecentral member30 deforms to its dispensing position shown inFIG. 4B. The support36 is then pushed outward and in both embodiments thegrooves34 and38 narrow. Once the break through point is reached, theslit33 opens automatically.
• The radially outwardly increasing thickness makes the central member less susceptible to inverting. This is a very important characteristic as an inverted shape remaining after pressure relieve renders the dispensing valve useless. As a direct result of the increasing thickness any deformation of the central member will cause stress in the resilient central member which will force the central member to always return to its original shape when the pressure is relieved.
• Generally the invention is based on the inventive thought of providing a dispensing valve with a hingeable support having a double function: firstly it acts as an arm movable due to the hinge construction and secondly it acts as a pedestal for the membrane.
• Preferably the dispensing valve or at least the central member thereof according to the invention is made of a suitable elastomeric material, such as thermo set or thermoplastic rubber. The thickness of the support is chosen larger than the thickness of the membrane. Consequently the support is more rigid in order to maintain a rather stable form, whereas the membrane is more flexible. Optionally the material of the flange may be reinforced to facilitate the assembly of the valve in the cap of the container.
• It is noted that different variants of the preferred embodiments shown are possible within the scope of the invention. In particular the various technical measures of the alternative embodiments of the central member of the dispensing valve shown in the accompanying figures can be combined to form other alternative embodiments which are to be incorporated herein.
• The dispensing valve according to the invention is preferably universally suitable and can be manufactured in a range of sizes. The dispensing valve is designed for cost effective production thus facilitating the use as a disposable article.
• Although the preferred embodiment of the dispensing valve has been described in the context of a fluid dispensing container the invention is not limited thereto. A person skilled in the art will have no difficulty making small changes to the dispensing valve, such as scaling it up, in order to render it suitable for a particular intended use outside this field.

Claims (11)

1. A dispensing valve for dispensing fluid from a container, comprising:

a central member provided with a flexible membrane having at least one slit;

a flange surrounding the central member for attaching the valve to the container; and

connecting means for connecting the central member to the flange, which connecting means comprise a material hinge, wherein the valve is deformable from a closed position to a dispensing position upon application of pressure to the fluid in the container,

characterized in that,

the central member is further provided with a support for the flexible membrane, which support is more rigid than the flexible membrane and extends towards the container in the secured position of the dispensing valve, wherein the material hinge directly couples the support to the flange.

2. A dispensing valve according toclaim 1, wherein the material hinge on the one side is located at the upper part of the flange and on the other side at the lower part of the support.

3. A dispensing valve according toclaim 2, wherein the material hinge on the one side is located at the inner upper edge of the flange and on the other side at the outer lower edge of the support.

4. A dispensing valve according toclaim 1, comprising a second material hinge arranged on the central member.

5. A dispensing valve according toclaim 4, wherein the second material hinge is located adjacent the support.

6. A dispensing valve according toclaim 4, wherein a first groove is arranged on the central member for forming the second material hinge.

7. A dispensing valve according toclaim 4, comprising a third material hinge arranged on the central member between the second material hinge and the center of the flexible membrane.

8. A dispensing valve according toclaim 7, wherein the third material hinge is arranged in the vicinity of the slit.

9. A dispensing valve according toclaim 7, wherein a further groove is arranged on the central member for forming the third material hinge.

10. A dispensing valve according toclaim 1, wherein the support is thicker than the flexible membrane.

11. Container for holding fluid, provided with a dispensing valve as described inclaim 1.

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