Pierceable dispenser container and closure

Abstract

A dispensing container having a neck with a throat opening closed by a cap having a pierceable membrane adjacent atop of the cap, the cap having a dispensing nozzle with a lumen therethrough and an overcap for enclosing the dispensing nozzle having a moveable plunger pin extending into the lumen of the nozzle and moveable therein to pierce the membrane.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exterior view of a dispensing container and cap assembly.

FIG. 2 is a cross sectional view of FIG. 1 illustrating the container, an intermediate cap, a nozzle cap, and an overcap.

FIG. 3 is an enlarged cross sectional view of the end of the container and the cap assembly.

FIGS. 4, 5 and 6 are cross sectional views of different embodiments of the diaphragm of the intermediate cap.

DESCRIPTION OF THE PREFERRED EMBODIMENT

As shown in FIG. 1, a dispensing container and cap assembly 10 is provided having a container body 11 which has a closed bottom 12 at one end and which carries an intermediate cap 13 at the other end. A nozzle cap 14 is carried by the intermediate cap and projects away from the container body 11. An overcap 15 is carriable by the nozzle cap and in turn carries a moveable plunger pin 16. The nozzle cap, overcap and plunger pin are preferably constructed similar to the teachings of U.S. Pat. No. 6,726,060, the teachings of which are incorporated herein by reference.

The container body is preferably a blow molded body 11 and although shown as being substantially tubular in the preferred embodiment, it would be understood by persons of ordinary skill in the art that the container body 11 may be otherwise shaped and may be formed by methods other than blow molding and could, for example, if compatible with the contents, be formed of metal or other non-plastic material. In the preferred embodiment, the intermediate cap is a plastics material structure formed of polyethylene, hydensilypolyethylene, polyprophylene or high impact polyprophylene, HIPP. These materials can be compatible with, for example, anaerobic adhesives. Similar plastics materials may be used for the container body 11, the nozzle cap 14 and the overcap 15. Preferably the pin 16 is formed either by molding or machining of reinforced plastics material, for example fiberglass-filled or carbon fiber containing plastics. Although the pin 16 is preferably formed as a unitary piece, it would be appreciated by those skilled in the art that at least the non-head portion 18 including the piercing tip 19 may be formed separately from the pin head 20 and affixed thereto by various methods including insert molding. Depending upon the material of the membrane 21 positioned in the intermediate cap 13, portions of the pin 16, including at least the tip 19, may be strengthened with respect to other portions of the tip 16 or formed of a different material, such as metal, at least in part.

As best shown in FIG. 3, the container is formed with a neck 25 having an exterior thread 26, the neck terminating in a throat opening 27. The throat opening may have an inner diameter less than the inner diameter of the neck portion 25 and may be formed as a circular opening having an angled or frustoconical inner diameter defining wall 30. The intermediate cap 14 is provided with a proximal end 40, a distal end 41 and a body portion between the ends. A skirt portion 42 defines the proximal end and is internally threaded and terminates in a bottom wall 43 such that the skirt portion forms a central recess or bore in the body of the intermediate cap open to the proximal end. The skirt portion is internally threaded at 44 with thread designed to mate with the thread 26 of the container neck.

Preferably the threads 26 and 44 are of the type known as self-locking threads such that upon fully tightening the intermediate cap onto the neck of the container, a high resistance to unthreading is created, and any leakage path through the thread is minimized or eliminated. The bottom wall 43 of the intermediate cap is provided with a central boss 45 projecting into the bore. The boss preferably has an outer diameter surface 46 defined by a slanted or frustoconical wall dimensioned to extend into the throat opening and to engage the wall 27 of the throat opening in a sealing manner. Where the wall 27 is formed as a slanting or frustoconical wall, the wall 46 may have a mating taper or a slightly different taper providing a slight interference bit between the container throat opening wall 27 and the intermediate cap boss wall 46. Alternatively, the wall 27 of the container may be cylindrical providing an inner diameter top edge which will engage the sloping wall 46 of the boss 45 in an edge seal. Again, a slight interference bit may be advantageous when the intermediate cap is fully threaded onto the container neck.

The distal end 41 of the intermediate cap is provided with a central recess or depression 47 which may be defined by an inner diameter boundary wall having sealing and shape characteristics similar to that described for the throat opening of the neck. The nozzle cap 14 may preferably have a proximal end 50 defined by a threaded skirt 51 having internal threads terminating in a bottom wall 52 interior of the skirt, the bottom wall having a raised boss 53 centrally located therein. The boss 53 may have an exterior wall similar to the wall 46 of the intermediate cap such that the nozzle cap, when threaded onto exterior thread 48 of the intermediate cap will sealingly engage between the boss 53 and the recess wall 47 in a manner similar to that described above between the container throat opening and the boss 45 of the intermediate cap. The recess 47 terminates at its bottom in the membrane 21, the other side of the membrane forming a proximal end or dividing wall of a dispensing channel 49. The dispensing channel 49 is open to the central portion of the boss 45 and extends from the throat opening to the membrane when the intermediate cap is secured to the container. Upon piercing of the membrane the dispensing channel 49 will be open to the recess 47 forming a full dispensing channel through the intermediate cap.

Again, it is preferable if the thread securing the nozzle cap to the intermediate cap be formed so as to provide a secure attachment of the nozzle cap to the intermediate cap resisting unthreading. Such thread designs which are known to persons skilled in the art, in addition to securely affixing the intermediate cap to the container and the nozzle cap to the intermediate cap additionally form barriers to leakage paths along respectively the inner section of the inner diameter of the skirt of the intermediate cap and the outer diameter of the neck of the container and the inner diameter of the skirt of the nozzle cap and the outer diameter of the intermediate cap.

As illustrated in FIGS. 2 and 3, the intermediate cap may be stepped such that the distal end is of smaller diameter than the proximal end with the externally threaded area of the distal end being of sufficiently smaller diameter such that the outer diameter of the skirt of the nozzle cap does not extend beyond the outer diameter of the skirt portion of the intermediate cap.

In the preferred embodiment the membrane 21 is formed in situ during the modeling of the intermediate cap is monolithic therewith and as shown in FIGS. 4, 5 and 6, is dimensioned to be thinner in its central area than at its outer periphery where it merges into the main body portion of the intermediate cap. This thinning may be formed by opposed convex and concave surfaces as shown in FIG. 4 or by a thicker ring at the outer periphery of the membrane as shown in FIG. 5 or, preferably, by a tapered transition ring as shown in FIG. 6 where the outer periphery tapers at, at least on one end side, and preferably both end sides, of the membrane and the central section is relatively thin.

As is known to those skilled in the art of plastics, plastics materials have a normal elasticity to a greater or lesser extent. Such elasticity makes such plastics materials difficult to pierce since the plastics will initially stretch forming a dimple in the membrane when the pin tip is forced against the membrane.

That dimple will subsequently begin to rupture or tear allowing the pin tip to pass through the membrane. It has been found that, however, the opening formed by the tearing of a slightly elastic plastics material membrane, although initially being large enough for the pin to pass through the membrane, given proper selection of plastic material grippingly engage the outer diameter of the pin. Upon removal of the pin the opening of the membrane may be noticed to be smaller overall than the cross-sectional volume of the portions of the pin which pierced through the membrane. Additionally, it has been discovered that the dimple formed at the initial stage of piercing will, to an extent, be retained in the subsequent free state of the membrane after the pin has been withdrawn.

The pin is axially moveable in the overcap between a first position, illustrated in FIG. 3, where the tip 14 is spaced from the membrane 21 to a pierced position where the tip 14 has passed through the membrane and into the dispensing channel 49. The pin extends through the lumen 18 of the nozzle cap. When the overcap is rethreaded onto the nozzle cap, with the pin in the fully depressed piercing position, the pin tip will again enter the opening through the membrane. The dimple helps to align the tip end by forming a guiding depression. In this manner it has been determined that the pin, in the normal course, will reenter the opening in the membrane, where due to the elasticity of the membrane, the boundary walls of the opening will engage the outer diameter of the pin aiding in providing a good seal between the interior of the container body and the environment.

A secondary seal is provided along the length of the pin by providing a tapered wall 60 intermediate the ends of a central channel 61 which extends through the overcap. The tapered wall 60 sealingly engages the outer diameter of the tip area 55 of the nozzle tip and may act to constrict the tip area into contact with the outer diameter of the pin upon full seating of the overcap on the nozzle cap. The pin may have a larger diameter in the area which enters the tip end when the pin is in its piercing position.

To retain the piercing pin in its full up, non-piercing position, the pin may be provided with an indentation or circumferential groove 70 at the head 20 and the channel 61, adjacent its distal end 71 may be provided with an inner diameter bead 72 which is snapable into the groove 70 thereby providing an initial resistance to movement of the pin. A secondary groove 74 may be provided axially spaced from the groove 70 into which the bead 72 will extend when the pin is in its fully depressed, membrane piercing position. The bead may be discontinuous.

The overcap 15 is threadably received on the nozzle cap, preferably through a non-locking thread engagement allowing relatively easy connection of the overcap to the nozzle cap and removal therefrom. Since upon re-affixing the overcap to the nozzle cap, the pin will project through the lumen, a post piercing sealed condition exists. That condition includes the sealing face engagement between the throat opening 27 and the boss 45, the seal formed by the boss 53 and the recess 47, the seal formed by the pin extending into the opening in the membrane and a seal formed by the engagement of the dispensing nozzle tip with the outer diameter of the pin. The sealing interfaces combine with the sealing nature of the thread connection between the dispensing cap and the intermediate cap and the sealing thread connection between the intermediate cap and the container neck. Persons of skill in the art will appreciate that the bass and mating surface portions could be reversed so that, for example, the recess could be formed on the nozzle cap and the boss on the intermediate cap. In such an arrangement the membrane could be positioned at or adjacent the boss end. It will be appreciated that these multiple sealing points, individually and collectively, both protect the contents of the container from environmental degradation after opening of the membrane and prevent leakage irrespective of the orientation of the container during those periods between dispensing usage. In this manner, not only does the membrane sealed container provide an extended shelf life for the filled container prior to piercing, it extends the shelf life of the contents subsequent to piercing.

Although we have shown a preferred embodiment in which the container, the intermediate cap, the nozzle cap, the overcap, and the piercing pin may all be formed of plastics material, and the membrane formed in situ during molding of the intermediate cap, it will be appreciated that other variations may be provided and that one or more of the component parts or assemblies may be manufactured of other materials. For example, the membrane may be formed as a separate diaphragm and secured in place in the dispensing channel of the intermediate cap by various techniques, including insert molding, thermal bonding or as a part of a threaded or otherwise secured plug member. Additionally, although the preferred embodiment is particularly suitable for anaerobic adhesives, it will be understood that by proper selection of the materials of the various component parts, either alone or in combination with known filling techniques, such as filling in the presence of an inert gas, the dispensing container of this invention may be used with other materials, including other adhesives, fluidic solder, pastes, epoxies, solvents, or in general, those materials benefiting from containers protected against environmental contamination while providing enhanced control over dispensing. In the embodiment illustrated, the container body is preferably yieldable and resilient so that dispensing is easily controlled by slightly squeezing the container body. The use of a resilient container body enhances the control of the dispense by providing a sniff-back recapture of material from the lumen upon release of the squeezing pressure.

Other variations utilizing this invention will be apparent to those of ordinary skill in the art.

Claims

1. A dispensing fluid container and cap assembly comprising: a) a container body having an opening; b) an intermediate cap having first and second ends, the intermediary cap carried by said container body, the intermediary cap having a dispensing channel open to said opening and to a second end of the intermediate body, the channel closed by a pierceable membrane intermediate the first and second ends; c) a nozzle cap carried by said intermediate cap having a lumen therethrough open to the channel at the first end, the lumen terminating in a dispensing tip; and d) a piercing member positionable in said lumen and moveable therein to pierce said membrane, said pin removeable from said lumen whereby after piercing the membrane, contents of the container body can be dispensed through said dispensing tip.

2. The assembly of claim 1 wherein the membrane is positioned in said channel closer to the first end than to the second end of the intermediate cap.

3. The container and cap assembly of claim 1 wherein the membrane is formed of a plastics material.

4. The assembly according to claim 3 wherein the intermediate cap and membrane are formed of plastics material and the membrane is molded in situ.

5. The assembly of claim 4 wherein the membrane has a central portion and an outer boundary and has a lesser thickness in the central portion thereof than at the outer boundary portion.

6. An assembly according to claim 4 wherein the first end is a distal end to which the nozzle cap is secured and the second end is a proximal end to which the container body is secured, the container body having a throat opening in communication with the dispensing channel, the dispensing channel having a proximal opening defined in a projecting boss, the boss dimensioned to be received in the throat opening in sealing peripheral engagement with surface portions at an interior of the throat opening.

7. An assembly according to claim 6 wherein the nozzle cap has proximal and distal ends, the distal end forming a dispensing tip, the proximal end having the lumen open thereto, the lumen defined at the opening of the proximal end by a raised boss, the distal end of the intermediate cap having a recess therein adapted to receive the raised boss of the nozzle cap, the boss of the nozzle cap being provided with a sealing surface sealingly engaging interior wall portions of the recess.

8. An assembly according to claim 7 including an overcap adapted to be carried by the nozzle cap, the nozzle cap having an opening therethrough, the piercing member positioned in said opening and alignable with the lumen to project thereinto when the overcap is carried by the nozzle cap, the piercing member being moveable in the opening between a first position spaced from the membrane when the overcap is fully seated on the nozzle cap and a second position with portions of the piercing member extending through the membrane when the overcap is fully seated on the nozzle cap, the overcap being removable from the nozzle cap.

9. A dispensing container and cap assembly comprising: a container body having a neck and a throat opening open to an interior of the body, an intermediate cap having proximal and distal ends with a dispensing channel open to each end, a pierceable membrane closing said dispensing channels, a nozzle cap having a lumen therethrough carried by said intermediate cap with said lumen open to said channel, the lumen terminating at a distal end of the nozzle cap in a dispensing tip, and a piercing member insertable through said lumen and moveable therein to pierce said membrane, the piercing member being removable from said lumen after piercing.

10. The assembly of claim 9 wherein the piercing member is carried by an overcap threadably securable to the nozzle cap, the overcap having an axial opening therethrough receiving the piercing member, and the piercing member being moveable in said opening in said overcap.

11. The assembly of claim 10 wherein the overcap is threadably carried by the neck and wherein the nozzle cap is threadably carried by the intermediate cap.

12. The assembly of claim 11 wherein mating sealing surfaces are provided between the intermediate cap and the throat opening when the intermediate cap is fully threaded onto the body, the sealing surfaces providing a seal between an interior of the body and the exterior of the intermediate cap except through the dispensing channel.

13. The assembly of claim 12 wherein mating sealing surfaces are provided between the intermediate cap and the nozzle cap when the nozzle cap is fully seated on the intermediate cap, the sealing surfaces providing a seal between the intermediate and nozzle caps except through the dispensing channel and lumen.