Patent Application
20100213215
1. Field of the Invention
This invention relates to an improved throat plug assembly for a dispensing system, which may be either an open loop or closed loop dispensing system, and more particularly to a dispensing system for dispensing corrosive liquid chemicals or dangerous medical liquid products which are typically drawn from the upper end of a container, such as a bottle or the like, to a mixing machine or the like. In the instant invention, the container is inverted with the liquid product gravity flowing from the lower end thereof. Further, the dispensing system of this invention provides a means for venting the container during shipment or storage in those situations where the liquid within the container requires venting. Even more particularly, this invention relates to a plastic spring-loaded valve within the throat plug assembly. In the preferred embodiment, the retainer at one end of the throat plug assembly and the plastic spring are of one-piece molded construction.
2. Description of the Related Art
Corrosive liquid chemicals and dangerous medical liquid products are typically contained in a container such as a bottle or the like and are frequently dispensed therefrom to a mixing machine. Normally, a cap is placed on the bottle with a dip tube extending therefrom downwardly into the interior of the bottle for drawing the liquid upwardly thereinto. Normally, a dispensing tube extends from the cap to a mixing machine or some other piece of equipment which creates suction in the dispensing tube to draw the liquid from the interior of the bottle. In some prior art devices, when the suction or vacuum is removed from the dispensing tube, backflow may occur. Further, when the cap is removed from the bottle, backflow from the dispensing tube may also occur. Additionally, when the cap is removed from the bottle, liquid residue in the bottle may spill therefrom. Additionally, the conventional prior art systems normally do not prevent the re-use of the bottle which is prohibited in some cases. Yet another disadvantage of the prior art is that a reliable and efficient venting means for the bottle is not normally provided for relieving vacuum pressure from within the bottle. The system of Applicant's U.S. Pat. No. 6,968,983 solved the problems associated with the prior art devices or systems.
While the system of Applicant's U.S. Pat. No. 6,968,983 works extremely well when the container is in its normal upright condition, the system may not perfectly function when the container of said patent is inverted. When the container or bottle of the said patent is inverted, the liquid in the container is drawn or discharged from the normal upper end of the container but which is the lower end of the container in the inverted position. In such a position, the venting membrane, which would normally permit ambient air to replace the liquid in the container as the liquid is discharged from the container, may become “clogged” due to the liquid coming into contact therewith and crystallizing thereon. If air is not permitted to enter the container as the liquid is drawn therefrom, a partial vacuum is created in the upper end of the inverted container which will interfere with the discharge of the liquid therefrom.
In Applicant's earlier throat plug assemblies which were an important part in the dispensing and/or dosing systems, a metal spring was utilized to yieldably maintain the valve in the throat plug assembly in a closed position with a separate cap or retainer holding the metal spring in position. An ecological problem exists with the use of a metal spring in an otherwise completely recyclable plastic throat plug assembly since the metal spring must be removed from the throat plug assembly which is being discarded to enable the other plastic components of the throat plug assembly to be recycled. In many cases, the discarded throat plug assemblies were simply thrown into the trash due to the cost of removing the metal spring from the throat plug assembly. Further, in Applicant's earlier throat plug assemblies, the metal spring and the retainer thereof were separate pieces or parts thereby requiring separate manufacture and separate assembly into the throat plug assembly.
This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key aspects or essential aspects of the claimed subject matter. Moreover, this Summary is not intended for use as an aid in determining the scope of the claimed subject matter.
This invention relates to a dispensing system for use with a container, such as a bottle or the like, having an outlet opening formed in the upper end thereof. A cap is removably mounted on the container for selectively closing the outlet opening during shipment and storage. In use, the container is positioned in an inverted position. The lower end of the inverted container has a hollow throat extending downwardly therefrom which has interior and exterior surfaces. A throat plug assembly, having upper and lower ends, is positioned in the throat of the container. The throat plug assembly includes a hollow cylindrical plug member having an open upper end, an open lower end, and a cylindrical wall portion extending therebetween. A tube support is positioned on the open upper end of the plug member. A hollow tube, having upper and lower ends, is secured to the tube support so that its lower end is positioned below the tube support within the plug member. The open lower end of the plug member defines a valve seat. A valve assembly or means is movably positioned within the plug member and includes a normally closed valve and a hollow valve stem extending upwardly therefrom. The hollow valve stem is slidably mounted on the hollow tube which is secured to the tube support. The valve is movable between open and closed positions. The valve, when in its closed position, seats upon the valve seat to close the open lower end of the plug member. A spring is provided in the plug member which is in engagement with the valve means to yieldably urge the valve to its closed position. The valve, when in its closed position, prevents liquid within the container from flowing therefrom. The valve, when in its open position, permits liquid within the container to flow therethrough. At least one of the tube support, cylindrical wall portion or valve stem has a passageway formed therein. The throat plug assembly, when the valve is in its open position, permits liquid in the container to flow therefrom through the passageway, around the valve and outwardly through the valve seat. The throat plug assembly, when the valve is in its open position, permits air to enter the container by passing through the valve seat, around the valve and through the passageway.
When the container contains liquids that require venting during storage or shipment, the throat plug assembly is designed in such a way so as to cooperate with the container cap so that the valve is slightly unseated so that pressure within the container may be vented through the throat plug assembly and through an opening formed in the cap. The valve permits vapor pressure to pass therethrough but prevents liquid from passing therethrough.
It is therefore a principal object of the invention to provide an improved dispensing system for corrosive or dangerous liquids contained in a container such as a bottle or the like, when the container is positioned in an inverted condition.
A further object of the invention is to provide a dispensing system which includes a throat plug positioned in the outlet opening of the container with the throat plug being designed so that it will permit vapor pressure within the container to be vented therethrough when the container is being stored or transported.
Still another object of the invention is to provide an improved dispensing system of the type described which permits sufficient air to enter the interior of the container to replace the liquid being dispensed therefrom so that vapor locks are prevented.
Still another object of the invention is to provide a dispensing system which is safe and convenient to use.
Yet another object of the invention is to provide a dispensing system which is reliable in use.
These and other objects will be obvious to those skilled in the art.
Non-limiting and non-exhaustive embodiments of the present invention are described with reference to the following figures, wherein like reference numerals refer to like parts throughout the various views unless otherwise specified.
Embodiments are described more fully below with reference to the accompanying figures, which form a part hereof and show, by way of illustration, specific exemplary embodiments. These embodiments are disclosed in sufficient detail to enable those skilled in the art to practice the invention. However, embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. The following detailed description is, therefore, not to be taken in a limiting sense in that the scope of the present invention is defined only by the appended claims.
In the drawings, the numeral 10 refers to a conventional container such as a bottle or the like which is used for transporting, storing and dispensing liquids therefrom.
The numeral 16 refers to a throat plug assembly which will be described as it is positioned when the container 10 is in the inverted position. The throat plug assembly 16 is inserted into the hollow throat portion 12 of the container 10 while the container 10 is in its upright position. For purposes of description, throat plug assembly 16 will be described as including an upper end 18 and a lower end 20. The lower end 20 of the throat plug assembly 16 includes a hollow cylindrical plug member 22 having an open upper end 24, an open lower end 26, and a cylindrical wall portion 28 extending therebetween. A disk-like tube support 30 or retainer is detachably mounted on the upper end of the cylindrical wall portion 28, preferably by means of a snap-fit connection. Retainer 30 includes a tube 32 having a lower end portion 34 and an upper end portion 36. As seen in the drawings, lower end portion 34 extends downwardly from retainer 30 and upper end portion 36 extends upwardly from retainer 30. In some cases, upper end portion 36 will not be needed. In some cases, a flexible tube (not shown) will be secured to the upper end of upper tube portion 36 so as to extend upwardly into the container 10, if so required. As seen in
The lower end of the plug member 22 defines a centrally located opening which defines a valve seat 40. The lower end of plug member 22 also has an outwardly extending lip portion 42 which is designed to engage the upper end of the container 10, as seen in
The numeral 44 refers generally to a valve means which is movably positioned within the plug member 22 and which includes a normally closed valve 46 and a hollow valve stem 48 extending upwardly therefrom. Valve stem 48 includes one or more passageways 50 extending therethrough. Valve 46 includes a tapered portion 52 at its lower end which terminates in a lower end portion 54. In those cases where the container contains liquids requiring venting during storage or shipment, the lower end portion 54 will protrude slightly downwardly from the lower end of plug member 22, as illustrated in
A lower fixture 80 is positioned below the shelf and within the shelf 60, as illustrated in
When the container 10 is being used to store, transport or dispense liquids which require venting during the shipment or storage thereof, the container 10 will include a vented cap 88 having a vent opening 90 formed therein, the lower end of which is closed by a membrane 92 which permits air to pass therethrough but does not pass liquid to pass therethrough. When the cap 88 is screwed onto the container 10, the membrane 92 will engage the end 54 of valve 46 to slightly open valve 46, as illustrated in
When it is desired to dispense the liquid from the container 10 into a receptacle, tub, container, etc., the valve 86 is opened to permit liquid to flow through the passageways 94, passageways 50, and through the valve seat 52, through the fixture 64, through fixture 80, and outwardly through the valve 86. Air is permitted to enter the interior of the container 10 to prevent air locks therein during the dispensing of liquids by permitting ambient air to pass downwardly through the passageways 72 in stub 70, thence through passageways 94, passageways 50, and upwardly through the passageway 36 and also through the tube 32 into the interior of the container. Although it is preferred that all of the passageways 50, 94 and 38 be utilized, in some situations it may be only necessary to use the passageways 38 or it may only be necessary to utilize the passageways 94 or it may be only necessary to utilize the passageways 50. If the liquid is very viscous, it may be advantageous to insert a flexible tube onto the upper end of upper end portion 36 so that air passing through the tube 32 will be able to pass through the viscous liquid to the upper end of the container.
Thus the dispensing system of this invention may be utilized to vent containers or it may be used where venting is not required. The system of this invention is extremely economical and provides for a continuous gravity flow due to the fact that ambient air can enter the interior of the container to replace the liquid being dispensed therefrom. The dispensing system of this invention eliminates any possibility of a vapor lock and provides a positive shut-off.
The numeral 116 refers to the improved throat plug assembly of this invention which will be described as it is positioned when the container 10 is in the inverted position. The throat plug assembly 116 is inserted into the hollow throat portion 112 of the container 10 while the container 10 is in its upright position. For purposes of description, throat plug assembly 116 will be described as including an upper end 118 and a lower end 120. The throat plug assembly 116 includes a hollow cylindrical plug member 122 having an open upper end, an open lower end 124, and a cylindrical wall portion 128 extending therebetween. A disk-like tube retainer or support 130 is detachably mounted on the lower end of the cylindrical wall portion 128, preferably by means of a snap-fit connection. Retainer 130 includes a tube 132 having a lower end portion 134 and an upper end portion 136. As seen in the drawings, lower end portion 134 extends downwardly from retainer 130 and upper end portion 136 extends upwardly from retainer 130. In some cases, upper end portion 136 will not be needed. In some cases, a flexible tube (not shown) will be secured to the lower end of lower tube portion 134 so as to extend upwardly into the inverted container 10, if so required. As seen in
The lower end of the plug member 122 defines a centrally located opening which defines a valve seat 140. The lower end of plug member 122 also has an outwardly extending lip or rim portion 142 which is designed to engage the upper end of the container 10 to limit the downward movement of the throat plug assembly 116 with respect to container 10 when the throat plug assembly 116 is inserted downwardly into the container 10 while the container is in its upright position. A plastic spring 143 embraces tube portion 132 as seen in
The numeral 144 refers generally to a valve means which is movably positioned within the plug member 122 and which includes a normally closed valve 146 and a hollow valve stem 148 extending downwardly therefrom. Valve stem 148 includes one or more passageways 150 extending therethrough. Valve 146 includes a tapered portion 152 at its upper end which terminates in an upper end portion 154. Valve stem 148 slidably receives the upper end of upper end portion 136 of tube 132. Spring 143 embraces valve stem 148 and upper end portion 136 to yieldably urge valve 146 to its upper closed position.
The entire throat assembly 116 is comprised of a recyclable plastic material. The fact that the spring 143 is plastic rather than metal as in Applicant's previous designs enables the entire throat assembly to be recycled without the necessity of removing a metal spring therefrom which is time consuming. Further the fact that the retainer 130 and spring 143 are of one-piece molded construction eliminates one part in the assembly process.
Thus, it can be seen that the invention accomplishes at least all of its stated objectives.
Although the invention has been described in language that is specific to certain structures and methodological steps, it is to be understood that the invention defined in the appended claims is not necessarily limited to the specific structures and/or steps described. Rather, the specific aspects and steps are described as forms of implementing the claimed invention. Since many embodiments of the invention can be practiced without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended.
