EP2796381B1

EP2796381B1 - Dispensing container

Info

Publication number: EP2796381B1
Application number: EP13179800.1A
Authority: EP
Inventors: Fang-Pin Chen
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-04-22
Filing date: 2013-08-08
Publication date: 2018-01-10
Anticipated expiration: 2033-08-08
Also published as: PL2796381T3; EP2796381A1

Description

BACKGROUND OFTHE INVENTION

Field of the Invention

This invention relates to a dispensing container having a body formed at least in part by a displaceable peripheral wall which can be displaced such as by squeezing to dispense contained fluid from a dispensing end of the body, the container being provided with an open bottom at an end opposite the dispensing end closed by a closure structure engaging the peripheral wall which structure can be applied after filling of the container.

Description of Related Art

Displaceable peripheral wall fluid dispensing containers where at least a portion of the wall is deformable inwardly to squeeze fluid from a dispensing opening are well known to the art. Such devices consist of both metal and plastic peripheral wall structures and are generally provided with a dispensing opening at one end and a filling opening at the other end. Often the dispensing opening is closed by a membrane which can be pierced to open a dispensing channel while the opposite end is, after filling, closed by crimping, folding or insertion of a plug, the plug procedure that is only effective when the peripheral wall's material at the open end is sufficiently distortion resistant to allow retention of plug. This can result in a stiffness of the wall which resists distortion making dispensing difficult.
While such dimensionally changeable peripheral wall dispensing containers have found use in products as diverse as cosmetics, toothpaste, calks, pharmaceuticals, adhesives, foods, and in general in most instances where a fluid can be extruded from the dispensing opening by squeezing the container or portions thereof.
It will be appreciated that the use of the term fluid is used in a broad concept and includes not only liquids but pastes, emulsions, compounds and other flowable materials. One common such use is found in dispensing containers for adhesives and in particular cyanoacrylate adhesives. Dispensing containers of the type described have included relatively stiff metal peripheral wall containers such as shown, for example in U.S. patent 5,649,648 where an extruded aluminum tube is provided having deformable sections and where an open end is closed by a plug inserted there into. Similar structures are found U.S. patent 5,799,829 and U.S. patent 6,726,060 . Such structures have been used for dispensing of cyanoacrylate adhesives and thread lockers. Such dispensers, whether formed as a round tube, or another shape such as oval or multi-sided, can have the open end generally opposite the dispensing opening closed by a plug if the material is stiff enough to allow the plug to be retained. One known technique is to form the plug with a mating shape portion for insertion into the open end and a larger end portion which abuts the end surface of the container. Thereafter, the peripheral wall can be constricted or deformed by known forming methods into tight engagement with the portion of the plug inserted into the interior of the container to seal the plug's periphery to the container's internal wall shape, for example by roll compression. The plug is normally made of a distortion resistant plastic compatible with the product to be dispensed. The end face of the plug can be used to provide a base surface to allow the dispenserto stand upright thus preventing the product contents from flowing out when the dispensing opening is not close.
Since well known to those skilled in the industry, however, the majority of the dispensing containers in use for the above mentioned products that rely upon a squeezable tube are made from either plastic which is then molded closed at the open end after filling, or which may be filled from the dispensing end after closure of the open end or are made from thin, non-brittle metal, normally aluminum or aluminum alloys and are closed at the filling, or open, end opposite the dispensing end by crimping the metal often after folding over a end portion.
A known disadvantage of such thin wall plastic and metal tubes is the fact that they can collapse intermediate the ends trapping material to be dispensed remote from the dispensing end and separated from that end by the collapsed section of the tube. A solution to that problem has been shown in my prior U.S. patent 7,766,190 , wherein I have provided an internal stiffener in the tube extending substantially along the length of the tube and having openings allowing fluid that becomes positioned between an outer diameter or exterior surface of the stiffener and the inner diameter of the tube to flow back into the interior of the stiffener.
While the structures shown in my aforementioned '190 patent aid in preventing collapse of the tube, immediate at its ends, the tube, particularly when the peripheral wall is formed of thin or weak materials such as aluminum or thin plastic must still be closed by a standard crimping action since the material, generally lacks sufficient strength to retain a plug inserted into the open end of peripheral wall.
JP2006008170 discloses a synthetic resin-made thin-walled container that is intended to have excellent sealability, excellent productivity and simple structure which is assembled while maintaining a consistent shape irrespective of the thin-walled structure. The flexible, thin-walled synthetic resin made sleeve is said to be extrusion-molded in a seamless manner.
In one aspect of JP2006008170 , a neck part of the container is integrally formed on the upper end of an extruded sleeve by insert molding. In contrast, a bottom part of the sleeve and a holding ring are prepared separately. The fitting portion of the injection molded bottom part is fitted into the inside from the opening of the lower end of the sleeve, whereby the bottom part is attached to the sleeve. Due to this mounting operation, the lower end of the sleeve overlapping with the fitting portion is slightly spread apart. Thereafter, a retainer ring is inserted from the upper end of the sleeve to which the neck component is attached, and the retainer ring is slid to the lower end of the sleeve striking a collar portion. As a result, the sleeve is intended to be tightly sandwiched between the holding ring and the fitting portion of the bottom part. Finally, the retaining ring and the flange portion of the bottom component are joined by bonding or the like. In another aspect of JP2006008170 , a rigid synthetic resin-made bottom part 2 is integrated with a lower end 1b of the sleeve by the insertion molding with the dimension to be within the outside diameter of the sleeve. A fitting part 3 to be fitted in the sleeve and a flange part 4 expanded outwardly from an upper end of the sleeve are provided on an upper end 1a of the sleeve. A rigid holding ring 6 which has a rigid neck part 5 attached thereto, is slidably inserted in the sleeve from the lower end toward the upper end of the sleeve, and holds the sleeve between the fitting part and itself, and is joined with the flange part is fitted to the sleeve.
It would therefore be an advance in the art if a method could be found to provide an internal stiffener insertable into an interior of a thin wall or weak distortable material container, where the tube can be provided with a plug type closure secure against leakage.

SUMMARY OF THE INVENTION

The present invention overcomes the deficiencies of the prior art by providing a dispensing container as defined in the claims. A deformable peripheral wall dispensing tube is provided. A stiffener may be inserted into the container from the open end, and a deformation resistant plug is provided for insertion into the open end. The plug has spaced raised portions having an outermost dimension greater than an interior dimension of the peripheral wall at the open end, the dimensional difference being relatively small whereby the plug may be forced into the open end providing an interference fit with the peripheral wall, thereby locally distorting the wall. A locking ring received around the peripheral wall has at least one internal reduced dimension area having an internal dimension approximately the same as the exterior dimension of the peripheral wall adjacent the open end. The ring may be forced to a position externally of the plug with the ring's reduced dimension section positioned in between the increased dimension portions of the plug with the peripheral wall entrapped therebetween, thereby providing a liquid seal preventing the contents from leaking from the open end by passage between the peripheral wall and the plug. According to the invention, a dispensing container having a tubular main body formed of an easily distortable material is provided, the main body having a hollow interior bounded at one end by a dispensing structure and at the other end by an open end, the open end being closed by a plug inserted into the open end after filling of the container, the plug having an outer diameter section with circumferential projecting ribs forming at least one groove therebetween, the ribs having an outer diameter greater than an inner diameter of a portion of the main body defining the open end whereby the portion of the main body defining the open end is distorted by insertion of the plug into the open end and is in sealing contact with the plug ribs, a locking ring being received around the main body portion surrounding the inserted plug, the locking ring having a plurality of inner diameter reducing circumferential ribs defining at least one groove therebetween, the ribs of the locking ring and the ribs of the plug being effective to distort the portion of the main body into the grooves and in sealing contact with the outer diameter section of the plug; the plug having an enlarged axial end portion positioned exterior of the tubular main body axially beyond the open end, the enlarged axial end portion of the plug forming a support surface allowing the container to be stably positioned on a surface with the dispensing end remote from the surface, the plug further comprising a radially extending collar which is open at its top to provide a groove receiving the bottom axial end of the locking ring. The container may include a stiffener positioned interior of the main body, the stiffener having a hollow interior portion defined by at least one wall, and at least one opening through the at least one wall from an interior thereof to an exterior thereof. The stiffener and plug may be integral with the plug forming an axial end of the stiffener opposite the dispensing end.
It will be appreciated by those of ordinary skill in the art that the above summary of the invention can undergo extensive modifications and that the dimensional relationships described between the plug, the peripheral wall and the ring may be changed.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is an exploded view of a tube shaped dispensing container according to this invention.
Figure 2 is an exterior side view of the dispensing container according to this invention formed as a tube.
Figure 3 is a cross section of the tube of Figure 2 taken along the line iii-iii of Figure 2.
Figure 4 is an enlarged partial sectional view of the indicated portion of Figure 3.
Figures 5 - 9 show alternative forms of the stiffener-plug combinations.

DETAILED DESCRIPTION OF THE INVENTION

Figures 1-4 illustrate one preferred form of this invention although it will be apparent that many different embodiments may be utilized in the practice of this invention. For example, Figures 1-4 illustrate the container as being substantially tubular and having a reduced diameter dispensing end and a generally cylindrical body. As will be appreciated by those skilled in the art, the actual geometric construction of the container may be varied and component parts of it may be varied in shape, position, construction, and dimension. For example, the main body may have different shapes, both in its entirety such as oval or multi-sided, or may have different shapes for different portions for the container body. Similarly, the portion of the container referred to herein as a stiffener 18 and shown as a generally tubular body could take other shapes and could, for example, have a circumferential discontinuities for all or a portion of the length of the stiffener with the exception of a ribbed bottom portion forming a plug 25.
As shown in Figure 1, the container 10 may be constructed of a main body 11 defined by a peripheral wall 12 which may be necked down at one end 13 to form a dispensing opening 14 which may consist of an axially extending reduced diameter threaded section. The opening may be closed by a membrane 70 which may thereafter be pierced to open the end 14 to the interior of the main body 11 and/or the stiffener 18. It will be appreciated that threading is optional and that different cap designs may be provided for the dispensing end, including dispensing caps not requiring a threaded connection.
The peripheral wall 12, for at least a portion of its length, including a portion adjacent an open bottom end 15, is formed of a deformable material. Preferred materials are aluminum, aluminum alloys, otherthin metals such as copper, copper alloys and plastics, all of which are well known in the squeezable dispensing container art. Although Figures 1-4 show the body 11 to have a consistent thickness of the peripheral wall 12 from the portion 13 to the open end 15, variations in thickness and stiffness of the peripheral wall may be provided if desired. For example, the portion 13 as well as the threaded section 16 leading to the dispensing opening 14 may, all or in part, be provided of thicker and/or stiffer materials choices whereby the dispensing end will not be easily distortable.
Ease of distortion of the peripheral wall 12 is an important consideration for at least a portion of the wall, thereby allowing the contents to be dispensed by squeezing the container's outer surface to reduce the interior dimension of the container body 11.
As is known, from amongst other sources, the above mentioned patents, the interior of the body 11 may be provided with a stiffener such as 18 which is open at at least one end 19 and which is dimensioned to be received with clearance interior to the body 11. The stiffener is usually made of a resilient material so as to return the deformable peripheral wall 12 to a shape close to its undeformed, free condition after squeezing. The stiffener, however, is designed to be compressible so as to allow squeezing to reduce the interior dimension of the inside of the main body 11 which may, for substantial portions of its length be defined by the interior of the stiffener 18. The degree of stiffness provided by the stiffener can be chosen with respect to the materials to be dispensed from the container. For example, when the container is used to dispense adhesives and in particular cyanoacrylate adhesives where only a small drop or two may be desired to be dispensed at each use, the stiffener 18 may be relatively stiff and compression resistant to prevent over dispensing while squeezing. For other products that may be dispensed, where a greater quantity per dispense is desired or where the product is thicker, such as toothpaste, the stiffener may be less resistant to compression to facilitate a greater and perhaps longer container body constriction.
As shown in Figure 1, the stiffener is preferably provided with at least one opening 20 extending through the wall of the stiffener. This opening permits flow of the contained product from a space between the stiffener outer diameter and the body 11 inner diameter back into the interior of the stiffener.
As shown in Figures 5-9 the arrangement of the opening 20 may vary as shown at 20(a)-20(f). Variations on those opening configurations may also be chosen.
As shown in Figures 1 and 3 and in Figures 5-9, a bottom section 25 of the stiffener may be provided as a plug 26 for insertion into the open end 15 of the body 11. In the figures, the plug 26 is shown as formed integrally with the stiffener 18, however it will be understood that this is only a preferred structure and that the plug can be formed as a separate element apart from the stiffener. Many of the benefits derived from this invention can be obtained utilizing a plug separate from the stiffener, or even eliminating the stiffener 18 in whole or in part and utilizing a more resilient material for the peripheral wall 12.
The plug 26 has an outer diameter section 27 which is provided with a plurality of raised circumferential ribs 28 which are axially spaced apart forming recesses or grooves 29 between the ribs circumferentially of the plug. The outer diameter of the ribs is greater than the inner diameter of the peripheral wall 12 of the body 11 adjacent the open end 15. Thus, when the ribbed section of the plug is inserted into the open end 15, after filling of the container, the peripheral wall 12 will be stretched to accommodate the plug. Preferably the plug is formed of a more compression resistant material compared to the material of the wall 12 such that the dimensions between the inner diameter of the peripheral wall 12 and the outer diameter of the ribs 28 will create an interference fit between the peripheral wall 12 and the plug's ribbed area.
A locking member 30 is provided which may be in the shape of a ring 31 having an axial length slightly greater than the axial length of the ribbed area of the plug and an inner diameter which consists of one or more diameter reducing ribs 32 spaced apart by grooves 33. The inner diameter of the ribs 32 is the same as or slightly larger than the outer diameter of the peripheral wall 12 at least adjacent the bottom 50 to allow the ring to be slipped along the body 11 or at least along a bottom portion.
The inner diameters of the locking member 30's ribs 32 are slightly less than the outer diameter of the ribs 28 of the plug, and the groove(s) 33 have a bottom diameter slightly greater than the ribs 28 of the plug. Inversely the groove(s) 29 of the plug have a groove bottom minimum diameter less than the inner diameter of the ribs 32 of the ring 31. These diameter relationships are chosen with respect to the thickness of the peripheral wall 12 so as to snugly entrap or even slightly compress the peripheral wall between the ribs and grooves of the ring and the plug in a sealing relationship between the inner diameter of the peripheral wall 12 and the outer diameter of the plug 25.
It will be appreciated that the locking member, when formed as a ring 31, may be assembled by moving it along the length of the body 11 and forcing it into coaxial circumferential alignment with the plug, or if the dimensioning of the body 11 changes along its axial length the ring 11 could be positioned adjacent the opening 15 spaced sufficiently above it so that the plug can be inserted. Because the plug and the ring are generally chosen of stiff materials, and because of the overlapping between the inner diameter ribs of the locking member ring 31 and the outer diameter ribs 28 of the plug, a condition made dimensionally more important due to the presence of the peripheral wall 12 at the time the locking member is positioned around the plug, it is preferable if either the plug or the ring or both have some resiliency to allow seating of the ring in position.
As is best shown in Figures 3 and 4, this can be partially facilitated by providing the plug portion 25 with a hollow interior 40 extending from an open plug bottom 41 to a closed plug top 42. The hollow interior 40 is defined by a peripheral wall 44 which extends beyond the bottom 50 of the wall 12 of the body 11. The preferably circumferential wall 44 of the plug extends beyond the bottom 50 and terminates in an end surface 51 exterior of the container. The surface 51 which may have extensions thereof of which may be circumferentially discontinuous as shown as 52 provides a base on which the container can be supported on a surface in an upright position. The base provides support for the container to maintain the dispensing orifice end upright. This represents an advance over prior distortable or compressible containers which generally rest sideways on a surface and may leak if not capped. This upright positioning of the container of this invention is facilitated by reason of the stiffener and its ability to return the container wall to its uncompressed position, or substantially so, such that the center of gravity is generally axially positioned along the length of the container.
As shown in Figure 4 the peripheral wall 12 will become distorted in a serpentine fashion as the ribs of respectively the plug and locking member ring 31 bend the wall 12 into seated position in the respective grooves of the plug and the ring which lie radially opposite the associated ribs.
In order to properly position the ring the plug has a radially extending collar 60 which is open at its top 61 to provide a groove 62 receiving the bottom axial end of the ring 31. That collar may flare outwardly at the top 61 providing a guiding lip to guide the ring into fully seated position. The bottom 63 of the groove 62 provides a stop for movement of the sleeve during assembly of the sleeve into its operative position with its ribs aligned with the plug's grooves and the plug's ribs aligned with the ring's grooves and further provides a stop for the plug during insertion of the plug as the bottom 50 of the container defined by the peripheral wall 12 contacts the bottom of the groove 62.
It will therefore be seen that this invention provides an improvement over the prior art of thin wall squeezable or collapsible tubes or dispensing containers by providing a plug closure to an open filling end of the container which, in cooperation with a locking member, securely seals the interior of the container against leakage at the open end when the plug is inserted and the locking member positioned properly. This is accomplished by providing a sealing fit by entrapping a peripheral wall of the container between the locking member and the plug, with the locking member on the outside of the peripheral wall and the plug on the inside of the peripheral wall. The plug and the locking member are each provided with circumferential alternating ribs and grooves so as to firmly lock the plug in place in the container and to alternately constrict and expand the wall of the container into sealed engagement with the plug's outer dimension.
Although the invention has been shown in connection with a preferred embodiment, numerous modifications of that embodiment are easily made by persons of ordinary skill in the art. According to an example which is not within the scope of the present invention, the groove 62 could be eliminated and the ring 31 simply bottomed against an outwardly extending portion 60 of the plug which can also service as the contact between the end 50 and the plugs enlarged diameter bottom support. Alternatively the ring and the plug could be dimensioned other than cylindrical, for example by tapering utilizing a opposed tapers or by other dimensional changes. The ribs and grooves could be increased or reduced in number and in dimension. According to an example which is not within the scope of the present invention, depending upon the constrictive resiliency of the ring and the stiffness of the plug the ribs and grooves could be eliminated. Other modifications may also be made without parting from this invention.

Claims

A dispensing container having a tubular main body (11) formed of an easily distortable material, the main body (11) having a hollow interior bounded at one end by a dispensing structure (14) and at the other end by an open end (15), the open end being closed by a plug (25) inserted into the open end after filling of the container, the plug having an outer diameter section (27) with circumferential projecting ribs (28) forming at least one groove (29) therebetween, the ribs having an outer diameter greater than an inner diameter of a portion of the main body defining the open end whereby the portion of the main body defining the open end is distorted by insertion of the plug into the open end and is in sealing contact with the plug ribs (28), a locking ring (31) being received around the main body portion surrounding the inserted plug, the locking ring having a plurality of inner diameter reducing circumferential ribs (32) defining at least one groove (33) therebetween, the ribs of the locking ring and the ribs of the plug being effective to distort the portion of the main body into the grooves and in sealing contact with the outer diameter section of the plug; the plug having an enlarged axial end portion positioned exterior of the tubular main body axially beyond the open end, the enlarged axial end portion of the plug forming a support surface allowing the container to be stably positioned on a surface with the dispensing end remote from the surface, the plug further comprising a radially extending collar (60) which is open at its top (61) to provide a groove (62) receiving the bottom axial end of the locking ring (31).
The container of claim 1 including a stiffener positioned interior of the main body, the stiffener (18) having a hollow interior portion defined by at least one wall, and at least one opening (20) through the at least one wall from an interior thereof to an exterior thereof.
The container of claim 2, wherein the stiffener and plug are integral with the plug forming an axial end of the stiffener opposite the dispensing end.