CA2470130A1 - Two piece screw cap closure - Google Patents
Two piece screw cap closure Download PDFInfo
- Publication number
- CA2470130A1 CA2470130A1 CA002470130A CA2470130A CA2470130A1 CA 2470130 A1 CA2470130 A1 CA 2470130A1 CA 002470130 A CA002470130 A CA 002470130A CA 2470130 A CA2470130 A CA 2470130A CA 2470130 A1 CA2470130 A1 CA 2470130A1
- Authority
- CA
- Canada
- Prior art keywords
- closure
- wall
- cap
- threads
- rim
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D47/00—Closures with filling and discharging, or with discharging, devices
- B65D47/04—Closures with discharging devices other than pumps
- B65D47/06—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages
- B65D47/10—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages having frangible closures
- B65D47/103—Membranes with a tearing element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D51/00—Closures not otherwise provided for
- B65D51/18—Arrangements of closures with protective outer cap-like covers or of two or more co-operating closures
- B65D51/20—Caps, lids, or covers co-operating with an inner closure arranged to be opened by piercing, cutting, or tearing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2251/00—Details relating to container closures
- B65D2251/0003—Two or more closures
- B65D2251/0006—Upper closure
- B65D2251/0015—Upper closure of the 41-type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2251/00—Details relating to container closures
- B65D2251/0003—Two or more closures
- B65D2251/0068—Lower closure
- B65D2251/0087—Lower closure of the 47-type
Abstract
A closure (4) for attachment to a cover (1) having an opening presenting an upstanding rim, comprising a body (5) having an annular top wall (10), said top wall merging with spaced inner and outer walls defining a depending body recess (14) for capturing said rim, said outer wall having threads (12) extending generally outwardly therefrom and the top wall presenting a notch; a cap (16) having a top, said top presenting a projection (18) disposed for alignment with said notch, an outer wall depending from said top, said outer wall having threads (21) for engagement with the threads of said body outer wall.
Description
TWO PIECE SCREW CAP CLOSURE
FIELD OF THE INVENTION
This invention relates in general to two piece plastic threaded closures with removable body diaphragm for press fit installation on container openings with beaded rim. The invention relates to an improved low profile closure, which overlies a relatively tall container annular beaded rim. The invention relates to the position io of the threads below the level of the container beaded rim for a lower closure profile on the container. The position of the cap threaded wall overlying the threaded body outer wall, braces the attachment of the closure to the container beaded rim for a strong mechanical attachment.
is BACKGROUND OF THE INVENTION
One and two piece screw cap closures are commonly used to contain and dispense liquids from containers. Two piece closures commonly combine a body piece incorporating a threaded neck with an overlying threaded cap. The body piece 2o typically has an annular recess or rim for attachment to the container, and may incorporate tamper evidence means such as a pull out diaphragm. The container or container cover is typically manufactured with an annular opening modified for subsequent attaching of the closure. Often the liquid contents are filled through the container opening, and the two piece closure is installed as part of the filling 2s operation. Metal cans with a beaded rim for press fit of a two piece plastic closure is a common example. Cardboard dairy product containers with a thermally bonded plastic threaded closure is another recent example.
One piece threaded plastic and metal screw caps remain the most common 3o closures due to low cost. One piece threaded caps may be applied directly to the container wherever the container opening is manufactured with suitable mating threads. Plastic and glass bottles with either plastic or metal threaded caps are common examples. Cap liners and gaskets are often required to close the voids between the cap and container to achieve a satisfactory liquid tight seal. The success of the one piece screw cap closure to retain the product without leaking depends upon the correct dimensional tolerance of both the cap and container threads, proper installation torque, and the elimination of voids in the joint.
Two piece closures are often preferred where the container opening thread dimensions vary due to manufacturing process variables, or where fabricating a io threaded opening in the container is difficult. For example forming a threaded neck in metal containers is difficult due to the mechanical limitations of metal drawing.
Plastic injection molded containers such as open head pails have molded threads which are subject to uneven post molding shrinkage leading to ovality of the threaded opening which can result in binding when threading the cap to the body.
is Plastic container manufacturing may be simplified by switching from a threaded opening to a simpler beaded rim, which results in savings in tooling and process scrap. Two piece threaded closures which combine ease of installation to the container with high performance and low cost are desirable.
2o One limitation of two piece threaded closures resides in the available height of the closure above the container surface where the cap must be sufficiently exposed to allow for easy gripping by hand for unthreading. If the cap is too high, it may be struck and dislodged during shipping and handling. A cap and body combination which has a low profile and strong attachment, but still allows for easy 2s removal is desirable. Furthermore a two piece closure which incorporates a removable diaphragm in the body is a desirable tamper evident feature.
Threaded cap closures often incorporate a gasket or liner to close voids in the mechanical joint, and create a liquid tight seal between the container opening 3o and the closure. Gaskets and liners add cost to the manufacture of closures, but allow for looser manufacturing tolerances by both the closure and container manufacturers. A two piece threaded closure where both the cap and body are manufactured and assembled as a set generally allows for tighter tolerances and improved mechanical seal design. A body piece molded of relatively soft plastic aids in the establishing of a good seal between the relatively hard plastic of both the container and the closure cap, due to the spreading force of the relatively soft plastic between the hard plastic to fill in any voids.
It is an objective of this invention to provide an improved two piece threaded closure design for press fit installation on plastic containers with beaded rims. The io improvements include the strong mechanical attachment and low profile of the closure which closely overlies a relatively tall container beaded rim.
It is a further objective of this invention to provide an improved two piece threaded closure utilizing a tapered or "V" shaped mechanical seal which is substantially eliminates the need for cap gaskets or liners.
It is a further objective of this invention to provide an improved two piece threaded closure utilizing a mechanical seal between the closure cap and body which eliminates the need for cap gaskets or liners.
DESCRIPTION OF THE PRIOR ART
Prior art two piece threaded closures are common and typically comprise of a body portion incorporating a threaded neck for engagement with a removable 2s threaded cap. The shape of the closures varies according to end use, the materials used and the method of attachment of the body piece to containers. Methods of attachment of the closure to the container include mechanical press fit, thermal bonding, adhesives and by other means. The closure cap is removable from the body at a later date for dispensing the product. Tamper evident features such as 3o pull out diaphragms may be incorporated. Secure attachment is important for the performance of the container.
U.S. Patent 5,267,675 illustrates a two piece closure that has a body which is designed for press fit into the container. An overlying threaded cap is shown removed for the attachment of the paint dispenser. The closure body is a s mechanical press fit inside an annular container opening. The body threads are above the plane where the closure attaches to the container. This design has the disadvantage of being exposed to side impact, with the closure being easily dislodged.
to U.S. Patent 3,770,156 discloses the cross section of a container using a mechanical seal to replace traditional tubular rubber gaskets in plastic pails. The seal incorporates two flexible annular rings that are tapered to a flexible point. This design utilizes a seal between a semi-rigid plastic pail cover and similar plastic in the container body. This invention relates to two piece closures with a removable is diaphragm, which are installed by mechanical press fit over a beaded rim.
Two piece plastic threaded closures, which are assembled to metal cans, are well known. Metal containers typically have a circular opening punched in the cover area. The edge of the opening may be reinforced by forming an annular lip or bead 2o in the metal. The metal bead may be used as an attachment for a mating recess in the plastic closure body.
Prior art arrangements of two piece closures teach a closure body that is molded from a softer plastic relative to a harder plastic cup, due to the sealing ability 2s of the softer plastic. The body-threaded neck is generally located in alignment with a body mating recess. The relatively harder plastic cap overlies the body threaded neck portion. The closure cap and body are typically pre-assembled by being threaded together. During installation the closure is positioned so the body recess aligns with the container opening rim. The closure and container are forced together 3o with the body recess and typically sized to expand over and securely grip the container rim. In this arrangement the container is now sealed for shipment.
The ... " ~t ~ ~.' d ~j 2 0'~ 2004; . GAO~a~~ so~;~,}.
' CA 02470130 2004-06-10 _.. , .,~ ,.s.~..
Jan-1Z-04 11:50am FrnmvMfLLER THOMSON + T-050 P.13/18 F-gg5 threaded cap sari later be easily removed and resealed py the end user.
L~mitat;vns on this design are the relatively high profile of the closure above the conramer,~
which may be strtack.and dislodged during shipment. It is desirable to have a closure which has a low profrle.
A closure from Reike (trade name) on the other hand has a relatively low profile but the securing means does not extend much beyond the beaded rim.
is Other prior art devices are shown m De 4~ 44 485 C.
Generally speaking the body recess ;n such prior art arrangements are Limited by the size of the beaded rim that can be farmed in the metal. This limits the mechanical engagement.and seal pen'ormance that can ize achieved between the container and closure. tt is desirable to increase the relative height of t(~e opening 1s rim and deepen the body recess for better attachment arid seal performance.
The taller opening rim can easily be, achieved m the manufacture of plastic inaeetion molded and blow moiled containers.
This invention relates to a two p;ece closure with a removable diaphragm, 2o which is installed by mechanica) press fit aver a beaded rirn_ In this invention, injection molded and blow plastic containers with fetativety tall opening with beaded rims have been identified as suitable candidates for the improved two piece threaded closures.
Empf.zeit:1~101/~004 17:49 ''A~,E~DEDLSHEET'70~ P.013 SUMMARY OF THE INVENTION
This invention relates in general to two piece plastic threaded closures with removable diaphragm for press fit installation on container openings with beaded s rim. More specifically the invention relates to the attachment of the closure to the container beaded rim using both a relatively tall inner wall and outer skirt, the outer skirt incorporating the body thread. The invention also relates to the position of the threads below the level of the container beaded rim for a lower closure profile on the container. The position of the cap threaded wall overlying the threaded body skirt, io braces the attachment of the closure to the container beaded rim for improved seal performance.
nROwiNrs is Figure 1 is a side and cross-sectional view of the two piece threaded closure before installation on a container cover.
Figure 2 is a side and cross-sectional view of the two piece threaded closure after installation on a container cover.
Figure 3 is a side and cross-sectional view of the closure body Figure 4 is a top view of the closure body 2s Figure 5 is a side and cross-sectional view of the closure cap Figure 6 is a top view of the closure cap Figure 7 is a sectional view of a typical container cover opening Figure 8 is a sectional view of an optional container opening with neck ring Figure 9 is a partial enlarged cross-sectional view of the two piece threaded closure after installation on a container cover.
LIST OF DRAWING NUMBERS
Number Description 1 container cover 16 closure cap 2 cover opening rim 17 cap top io 3 rim bead 18 cap seal projection 4 two piece threaded closure19 cap lugs 5 closure body 20 cap outer wall 6 body pull out diaphragm 21 cap thread 7 diaphragm pull ring 22 sealing recess is 8 body inner wall 23 container 9 body inner rim 24 container neck ring body top wall 25 thread face 11 body outer wall 25(a) lower face 12 body thread 25(b) upper face 13 frangible web 26 body outer rim 14 annular body recess 27 central axis 15 annular rim recess DESCRIPTION OF THE INVENTION
Like parts shall be given like numbers throughout the figures.
Figure 1 illustrates a two piece threaded closure 4 before installation on container cover 1. The closure 4 generally comprises a closure body 5 made of soft 3o flexible plastic (i.e. low density polyethylene (LDPE)) or the like, and a closure cap 16, made of semi-rigid plastic (for example high density polyethylene (HDPE)) or ~.~:<.-.::
l,Aj2 01 2004" ~A020ih905, ' ~ CA 02470130 2004-06-10 Jan-12-a4 11:5aam Frnm-MILLER THOMTpN ~ + T-05~ P.14118 F-B95 s the Irke. The body 5 and cap 96 are co-axially disposed about central axis 21' and secured in threaded assembly by, body thread 12 and cep thread 21.
A variety of thread types can be used in this invention. In one embodiment s buttress.thread5 have been favorably used as shown providing a strong fit. .
t=urtherrnore there is a small gap which rn one example can be in the order of up to .100 of an inch between the outer lip of the buttress threads and the body outer wall '11 and top outer wall 20 respectively, which accommodates any ovality of the annular shape of the body outer wall 11 and cap outer wall 2Q so as tv facilitate the so treading and unthreading of the closure cap 18 tv closure body 5, and minimize >'inaing of the parts.
Furthermore the buttress threads each present a telativeiy wide thread face 25 for strong threaded engagement therebetween. More specifically the body outer t 5 . wail 11 preserats buttress threads having a relatively wide Lower face 25(a) while the cap outer watt 20 prevents buttress threads having a relatively wide upper face 25(bj.
As rs shown in greater detail in Figure 9, closure body 5 is comprised of a 2o body pull out diaphragm 6 attached to a diaphragm Full ring T. ,rhe diaphragy~ 5 is attached by an annular frangible web 13 to the annular body inner wall 8. The inner . wall 8 is generally cylindrical in shape and terminates in body inner rim 9.
A body top wall 10 beginning near body inner rim 9' extends generally radially outward from the body inner wall 8, and leads t4 body outer wall 11. Outer wall 11 is cylindrical in 2s shape, and lies rapially outside of body inner wall 8. The inner wall 8, top wall 10, ~ 'w and body outer wall,l1, together form an annular body recess 94 on one side of the body top wall 10 and an annular nrn recess 15 so as to facilitate the treading and unthreading of the closure cap 16 to closure body 5, and minimize binding of the parts, sized to attach to the container cover 1.
IAI~~NDE~ SH~~T
Empf .zel t: l~/O1/~004 17:50 ' ,..". ...~. . . ,~rnw'i°:r ~r :::769 P.~14 F ~12~ 01 200~~ 4 '=CA02~f1905 ' ~ ~ CA 02470130 2004-06-10 ~ ~~~.~-. ~:.~t, ",z.. :.i Jan-1Z-o4 11:51am . Frnm-MILLER THOMSON + T-a5a P.15/18 F-885 Figure 2 is a side and cross-sectional view of the two piece threaded closure after installation on container cover 1. The container 1 presents a cover opening rim 2 having a generally upstanding peripheral sage with a rim bead 3 adapted to be received or captured by the annular rim recess 15 m a manner to be more fully " ~ described herein. As shown in Frg. 2 the rim bead 3 is outwardly bulbous in one embodiment of the invention.
As shown in greater detail in Frg. 9 the generally cylindrical inner watt 8 braces agarnst cover opening rrm 2 and body top wall 10 overlies rim bead 3.
lU During installation, the body outer war) 11 expands generally radiailY
outwardly (i.e.
the diameter expands) as rim bead 3 passes along body annular recess 1~ and into the annual rim recess to be captured therein. After installation, the.body outer wall 11 relaxes tv a smaller diameter and underlies rim bead 3. The cap outer wall overlies and braces the body outer wall 11. against rim,bead 3 to further resist ~s removal of closure 4 from container cover 1.
Figure 3 specifically shows the body inner rim 9, body top wall 1ti and body outer rim defining a notch or sealing recess 22 which is adapted tv receive cap seal projection 18 when the cap 16 is threaded tv the closure body 5. As the cap 17 is 20 thr°aded to t he Nody 5 thG relatirreiy soft plastic of body 5 "gives'' and creates a substantially tight seal, which seals quickly, rather than gradually, and acts as a gasket.
Figure 4 rs a top view of the closure body 5. Pull ring T is used to remove pull ?3 out diaphragm 6, Figure 5 is a side and crass-sectional view of the clvsvre cap 16 having top 17.
3o Figure 6 is a top view of the closure cap 16. A plurality of cap lugs 19 are used as finger grips to assist the installation and removal of cap 16. Cap seal r/~I~~~N.D,~D SHAFT', Empf.zeit:1~I01~~004 17:50 ~ ~ ~-~ ~~~~w-;'.r~~~~760 P.015 X12 flj-2004. ~ . CAC3201905f~
,.....
' ' CA 02470130 2004-06-10 . _. ,,..
Jan-12-04 11:51am Fresm-MILLER THOMSON * . T-050 P.18/1B F-BB5 projection 18 is designed to engage with body inner rim. and body outer rim ~6 to create a seal. .
Figure 7 is a side and doss-sectronat view of the opening in a typical container cover '1. A corer opening rim 2 which is generally cylindrical in shape ter,"~inates in a rim bead 3.
Frgure 8 is a side and cross-sectional view of an options! container 3 wrth necl~ ring, 2 and rirn bead 3. An annular container nec[c ring 24 may be used to iu support the container 23 during the installation ~af closure 4.
Figure 9 is a detail side and cross-sectional view of the two piece threaded closure after installation on container cover'1.
The assembly shown creates a low profile closure, resisting dislodgment when accidentally struck. Moreover the seal and closure is stronger and more robust. . ~ .
Various embodiments of the invention have now been describes! in detail.
2o Since changes in andlor.addrtions to the above-described best mode rx~ay be r~,,ade without departing from the nature, or scope of the invention, the invention is not to be limited to said details.
V
~~M~NDED SH-EE~T' EmPf .zei t :1/01/2004 17:50 ~ - ~ - ~~~~ ,~~,~,- , ~:~ ~, ~ ..769 P .01E
FIELD OF THE INVENTION
This invention relates in general to two piece plastic threaded closures with removable body diaphragm for press fit installation on container openings with beaded rim. The invention relates to an improved low profile closure, which overlies a relatively tall container annular beaded rim. The invention relates to the position io of the threads below the level of the container beaded rim for a lower closure profile on the container. The position of the cap threaded wall overlying the threaded body outer wall, braces the attachment of the closure to the container beaded rim for a strong mechanical attachment.
is BACKGROUND OF THE INVENTION
One and two piece screw cap closures are commonly used to contain and dispense liquids from containers. Two piece closures commonly combine a body piece incorporating a threaded neck with an overlying threaded cap. The body piece 2o typically has an annular recess or rim for attachment to the container, and may incorporate tamper evidence means such as a pull out diaphragm. The container or container cover is typically manufactured with an annular opening modified for subsequent attaching of the closure. Often the liquid contents are filled through the container opening, and the two piece closure is installed as part of the filling 2s operation. Metal cans with a beaded rim for press fit of a two piece plastic closure is a common example. Cardboard dairy product containers with a thermally bonded plastic threaded closure is another recent example.
One piece threaded plastic and metal screw caps remain the most common 3o closures due to low cost. One piece threaded caps may be applied directly to the container wherever the container opening is manufactured with suitable mating threads. Plastic and glass bottles with either plastic or metal threaded caps are common examples. Cap liners and gaskets are often required to close the voids between the cap and container to achieve a satisfactory liquid tight seal. The success of the one piece screw cap closure to retain the product without leaking depends upon the correct dimensional tolerance of both the cap and container threads, proper installation torque, and the elimination of voids in the joint.
Two piece closures are often preferred where the container opening thread dimensions vary due to manufacturing process variables, or where fabricating a io threaded opening in the container is difficult. For example forming a threaded neck in metal containers is difficult due to the mechanical limitations of metal drawing.
Plastic injection molded containers such as open head pails have molded threads which are subject to uneven post molding shrinkage leading to ovality of the threaded opening which can result in binding when threading the cap to the body.
is Plastic container manufacturing may be simplified by switching from a threaded opening to a simpler beaded rim, which results in savings in tooling and process scrap. Two piece threaded closures which combine ease of installation to the container with high performance and low cost are desirable.
2o One limitation of two piece threaded closures resides in the available height of the closure above the container surface where the cap must be sufficiently exposed to allow for easy gripping by hand for unthreading. If the cap is too high, it may be struck and dislodged during shipping and handling. A cap and body combination which has a low profile and strong attachment, but still allows for easy 2s removal is desirable. Furthermore a two piece closure which incorporates a removable diaphragm in the body is a desirable tamper evident feature.
Threaded cap closures often incorporate a gasket or liner to close voids in the mechanical joint, and create a liquid tight seal between the container opening 3o and the closure. Gaskets and liners add cost to the manufacture of closures, but allow for looser manufacturing tolerances by both the closure and container manufacturers. A two piece threaded closure where both the cap and body are manufactured and assembled as a set generally allows for tighter tolerances and improved mechanical seal design. A body piece molded of relatively soft plastic aids in the establishing of a good seal between the relatively hard plastic of both the container and the closure cap, due to the spreading force of the relatively soft plastic between the hard plastic to fill in any voids.
It is an objective of this invention to provide an improved two piece threaded closure design for press fit installation on plastic containers with beaded rims. The io improvements include the strong mechanical attachment and low profile of the closure which closely overlies a relatively tall container beaded rim.
It is a further objective of this invention to provide an improved two piece threaded closure utilizing a tapered or "V" shaped mechanical seal which is substantially eliminates the need for cap gaskets or liners.
It is a further objective of this invention to provide an improved two piece threaded closure utilizing a mechanical seal between the closure cap and body which eliminates the need for cap gaskets or liners.
DESCRIPTION OF THE PRIOR ART
Prior art two piece threaded closures are common and typically comprise of a body portion incorporating a threaded neck for engagement with a removable 2s threaded cap. The shape of the closures varies according to end use, the materials used and the method of attachment of the body piece to containers. Methods of attachment of the closure to the container include mechanical press fit, thermal bonding, adhesives and by other means. The closure cap is removable from the body at a later date for dispensing the product. Tamper evident features such as 3o pull out diaphragms may be incorporated. Secure attachment is important for the performance of the container.
U.S. Patent 5,267,675 illustrates a two piece closure that has a body which is designed for press fit into the container. An overlying threaded cap is shown removed for the attachment of the paint dispenser. The closure body is a s mechanical press fit inside an annular container opening. The body threads are above the plane where the closure attaches to the container. This design has the disadvantage of being exposed to side impact, with the closure being easily dislodged.
to U.S. Patent 3,770,156 discloses the cross section of a container using a mechanical seal to replace traditional tubular rubber gaskets in plastic pails. The seal incorporates two flexible annular rings that are tapered to a flexible point. This design utilizes a seal between a semi-rigid plastic pail cover and similar plastic in the container body. This invention relates to two piece closures with a removable is diaphragm, which are installed by mechanical press fit over a beaded rim.
Two piece plastic threaded closures, which are assembled to metal cans, are well known. Metal containers typically have a circular opening punched in the cover area. The edge of the opening may be reinforced by forming an annular lip or bead 2o in the metal. The metal bead may be used as an attachment for a mating recess in the plastic closure body.
Prior art arrangements of two piece closures teach a closure body that is molded from a softer plastic relative to a harder plastic cup, due to the sealing ability 2s of the softer plastic. The body-threaded neck is generally located in alignment with a body mating recess. The relatively harder plastic cap overlies the body threaded neck portion. The closure cap and body are typically pre-assembled by being threaded together. During installation the closure is positioned so the body recess aligns with the container opening rim. The closure and container are forced together 3o with the body recess and typically sized to expand over and securely grip the container rim. In this arrangement the container is now sealed for shipment.
The ... " ~t ~ ~.' d ~j 2 0'~ 2004; . GAO~a~~ so~;~,}.
' CA 02470130 2004-06-10 _.. , .,~ ,.s.~..
Jan-1Z-04 11:50am FrnmvMfLLER THOMSON + T-050 P.13/18 F-gg5 threaded cap sari later be easily removed and resealed py the end user.
L~mitat;vns on this design are the relatively high profile of the closure above the conramer,~
which may be strtack.and dislodged during shipment. It is desirable to have a closure which has a low profrle.
A closure from Reike (trade name) on the other hand has a relatively low profile but the securing means does not extend much beyond the beaded rim.
is Other prior art devices are shown m De 4~ 44 485 C.
Generally speaking the body recess ;n such prior art arrangements are Limited by the size of the beaded rim that can be farmed in the metal. This limits the mechanical engagement.and seal pen'ormance that can ize achieved between the container and closure. tt is desirable to increase the relative height of t(~e opening 1s rim and deepen the body recess for better attachment arid seal performance.
The taller opening rim can easily be, achieved m the manufacture of plastic inaeetion molded and blow moiled containers.
This invention relates to a two p;ece closure with a removable diaphragm, 2o which is installed by mechanica) press fit aver a beaded rirn_ In this invention, injection molded and blow plastic containers with fetativety tall opening with beaded rims have been identified as suitable candidates for the improved two piece threaded closures.
Empf.zeit:1~101/~004 17:49 ''A~,E~DEDLSHEET'70~ P.013 SUMMARY OF THE INVENTION
This invention relates in general to two piece plastic threaded closures with removable diaphragm for press fit installation on container openings with beaded s rim. More specifically the invention relates to the attachment of the closure to the container beaded rim using both a relatively tall inner wall and outer skirt, the outer skirt incorporating the body thread. The invention also relates to the position of the threads below the level of the container beaded rim for a lower closure profile on the container. The position of the cap threaded wall overlying the threaded body skirt, io braces the attachment of the closure to the container beaded rim for improved seal performance.
nROwiNrs is Figure 1 is a side and cross-sectional view of the two piece threaded closure before installation on a container cover.
Figure 2 is a side and cross-sectional view of the two piece threaded closure after installation on a container cover.
Figure 3 is a side and cross-sectional view of the closure body Figure 4 is a top view of the closure body 2s Figure 5 is a side and cross-sectional view of the closure cap Figure 6 is a top view of the closure cap Figure 7 is a sectional view of a typical container cover opening Figure 8 is a sectional view of an optional container opening with neck ring Figure 9 is a partial enlarged cross-sectional view of the two piece threaded closure after installation on a container cover.
LIST OF DRAWING NUMBERS
Number Description 1 container cover 16 closure cap 2 cover opening rim 17 cap top io 3 rim bead 18 cap seal projection 4 two piece threaded closure19 cap lugs 5 closure body 20 cap outer wall 6 body pull out diaphragm 21 cap thread 7 diaphragm pull ring 22 sealing recess is 8 body inner wall 23 container 9 body inner rim 24 container neck ring body top wall 25 thread face 11 body outer wall 25(a) lower face 12 body thread 25(b) upper face 13 frangible web 26 body outer rim 14 annular body recess 27 central axis 15 annular rim recess DESCRIPTION OF THE INVENTION
Like parts shall be given like numbers throughout the figures.
Figure 1 illustrates a two piece threaded closure 4 before installation on container cover 1. The closure 4 generally comprises a closure body 5 made of soft 3o flexible plastic (i.e. low density polyethylene (LDPE)) or the like, and a closure cap 16, made of semi-rigid plastic (for example high density polyethylene (HDPE)) or ~.~:<.-.::
l,Aj2 01 2004" ~A020ih905, ' ~ CA 02470130 2004-06-10 Jan-12-a4 11:5aam Frnm-MILLER THOMTpN ~ + T-05~ P.14118 F-B95 s the Irke. The body 5 and cap 96 are co-axially disposed about central axis 21' and secured in threaded assembly by, body thread 12 and cep thread 21.
A variety of thread types can be used in this invention. In one embodiment s buttress.thread5 have been favorably used as shown providing a strong fit. .
t=urtherrnore there is a small gap which rn one example can be in the order of up to .100 of an inch between the outer lip of the buttress threads and the body outer wall '11 and top outer wall 20 respectively, which accommodates any ovality of the annular shape of the body outer wall 11 and cap outer wall 2Q so as tv facilitate the so treading and unthreading of the closure cap 18 tv closure body 5, and minimize >'inaing of the parts.
Furthermore the buttress threads each present a telativeiy wide thread face 25 for strong threaded engagement therebetween. More specifically the body outer t 5 . wail 11 preserats buttress threads having a relatively wide Lower face 25(a) while the cap outer watt 20 prevents buttress threads having a relatively wide upper face 25(bj.
As rs shown in greater detail in Figure 9, closure body 5 is comprised of a 2o body pull out diaphragm 6 attached to a diaphragm Full ring T. ,rhe diaphragy~ 5 is attached by an annular frangible web 13 to the annular body inner wall 8. The inner . wall 8 is generally cylindrical in shape and terminates in body inner rim 9.
A body top wall 10 beginning near body inner rim 9' extends generally radially outward from the body inner wall 8, and leads t4 body outer wall 11. Outer wall 11 is cylindrical in 2s shape, and lies rapially outside of body inner wall 8. The inner wall 8, top wall 10, ~ 'w and body outer wall,l1, together form an annular body recess 94 on one side of the body top wall 10 and an annular nrn recess 15 so as to facilitate the treading and unthreading of the closure cap 16 to closure body 5, and minimize binding of the parts, sized to attach to the container cover 1.
IAI~~NDE~ SH~~T
Empf .zel t: l~/O1/~004 17:50 ' ,..". ...~. . . ,~rnw'i°:r ~r :::769 P.~14 F ~12~ 01 200~~ 4 '=CA02~f1905 ' ~ ~ CA 02470130 2004-06-10 ~ ~~~.~-. ~:.~t, ",z.. :.i Jan-1Z-o4 11:51am . Frnm-MILLER THOMSON + T-a5a P.15/18 F-885 Figure 2 is a side and cross-sectional view of the two piece threaded closure after installation on container cover 1. The container 1 presents a cover opening rim 2 having a generally upstanding peripheral sage with a rim bead 3 adapted to be received or captured by the annular rim recess 15 m a manner to be more fully " ~ described herein. As shown in Frg. 2 the rim bead 3 is outwardly bulbous in one embodiment of the invention.
As shown in greater detail in Frg. 9 the generally cylindrical inner watt 8 braces agarnst cover opening rrm 2 and body top wall 10 overlies rim bead 3.
lU During installation, the body outer war) 11 expands generally radiailY
outwardly (i.e.
the diameter expands) as rim bead 3 passes along body annular recess 1~ and into the annual rim recess to be captured therein. After installation, the.body outer wall 11 relaxes tv a smaller diameter and underlies rim bead 3. The cap outer wall overlies and braces the body outer wall 11. against rim,bead 3 to further resist ~s removal of closure 4 from container cover 1.
Figure 3 specifically shows the body inner rim 9, body top wall 1ti and body outer rim defining a notch or sealing recess 22 which is adapted tv receive cap seal projection 18 when the cap 16 is threaded tv the closure body 5. As the cap 17 is 20 thr°aded to t he Nody 5 thG relatirreiy soft plastic of body 5 "gives'' and creates a substantially tight seal, which seals quickly, rather than gradually, and acts as a gasket.
Figure 4 rs a top view of the closure body 5. Pull ring T is used to remove pull ?3 out diaphragm 6, Figure 5 is a side and crass-sectional view of the clvsvre cap 16 having top 17.
3o Figure 6 is a top view of the closure cap 16. A plurality of cap lugs 19 are used as finger grips to assist the installation and removal of cap 16. Cap seal r/~I~~~N.D,~D SHAFT', Empf.zeit:1~I01~~004 17:50 ~ ~ ~-~ ~~~~w-;'.r~~~~760 P.015 X12 flj-2004. ~ . CAC3201905f~
,.....
' ' CA 02470130 2004-06-10 . _. ,,..
Jan-12-04 11:51am Fresm-MILLER THOMSON * . T-050 P.18/1B F-BB5 projection 18 is designed to engage with body inner rim. and body outer rim ~6 to create a seal. .
Figure 7 is a side and doss-sectronat view of the opening in a typical container cover '1. A corer opening rim 2 which is generally cylindrical in shape ter,"~inates in a rim bead 3.
Frgure 8 is a side and cross-sectional view of an options! container 3 wrth necl~ ring, 2 and rirn bead 3. An annular container nec[c ring 24 may be used to iu support the container 23 during the installation ~af closure 4.
Figure 9 is a detail side and cross-sectional view of the two piece threaded closure after installation on container cover'1.
The assembly shown creates a low profile closure, resisting dislodgment when accidentally struck. Moreover the seal and closure is stronger and more robust. . ~ .
Various embodiments of the invention have now been describes! in detail.
2o Since changes in andlor.addrtions to the above-described best mode rx~ay be r~,,ade without departing from the nature, or scope of the invention, the invention is not to be limited to said details.
V
~~M~NDED SH-EE~T' EmPf .zei t :1/01/2004 17:50 ~ - ~ - ~~~~ ,~~,~,- , ~:~ ~, ~ ..769 P .01E
Claims (11)
1. A closure (4) for attachment to a cover (1) having an opening presenting an upstanding rim (3) comprising:
(a) a body (5) having an annular recess (14,15) formed between a spaced inner (18) and outer (11) annular wall, said recess (14,15) adapted to capture said rim (3), said annular outer wall (11) having threads (12) extending generally outwardly therefrom;
(b) a cap (16) having a top wall (17), said top wall (17) presenting an outer wall (20) depending from said top wall (17), said cap outer wall (20) having threads (21) for engagement with said threads (12) of said body outer wall (11);
(c) said rim (3), body (5) and cap (16) co-axially disposed about an axis (27);
characterized in that:
(d) said threads (12) of said body outer wall (11) and said threads (21) of said cap outer wall (20) are both disposed at and below a horizontal plane defined by said rim (3).
(a) a body (5) having an annular recess (14,15) formed between a spaced inner (18) and outer (11) annular wall, said recess (14,15) adapted to capture said rim (3), said annular outer wall (11) having threads (12) extending generally outwardly therefrom;
(b) a cap (16) having a top wall (17), said top wall (17) presenting an outer wall (20) depending from said top wall (17), said cap outer wall (20) having threads (21) for engagement with said threads (12) of said body outer wall (11);
(c) said rim (3), body (5) and cap (16) co-axially disposed about an axis (27);
characterized in that:
(d) said threads (12) of said body outer wall (11) and said threads (21) of said cap outer wall (20) are both disposed at and below a horizontal plane defined by said rim (3).
2. A closure (4) as claimed in claim 1 wherein said body (5) presents only two annular walls comprising:
(a) said inner annular wall (8);
(b) said outer annular wall (11).
(a) said inner annular wall (8);
(b) said outer annular wall (11).
3. A closure (4) as claimed in claim 1 wherein said body (5) is voidless.
4. A closure (4) as claimed in claim 1 wherein:
(a) said body (5) has a top wall (10) presenting a notch (22);
(b) said cap presents a projection (18) disposed for alignment with said notch (22);
and wherein said rim (3), notch (22) and projection (18) are radially aligned.
(a) said body (5) has a top wall (10) presenting a notch (22);
(b) said cap presents a projection (18) disposed for alignment with said notch (22);
and wherein said rim (3), notch (22) and projection (18) are radially aligned.
5. A closure as claimed in claim 4 wherein said body top wall (10) contacts said rim (3) and said cap top (7) wall contacts said body top wall (10).
6. A closure (4) as claimed in claim 5 wherein said body threads (12) have a relatively wide lower face (25a), and said cap threads (21) have a relatively wide upper face (25b) for secure engagement between said cap (16) and body (25).
7. A closure (4) as claimed in claim 6 wherein said body outer wall threads (12) move radially annularly outwardly relative said cap threads (21) where said beaded rim (3) is pressed through said annular recess (14,15).
8. A closure (4) as claimed in claim 7 wherein said notch (22) comprises an annular tapered notch adapted for sealing engagement with said cap projection (18) for maintaining sealing engagement.
9. A closure (4) as claimed in claim 8 wherein said body (5) comprises low density polyethylene and said cap comprises high density polyethylene.
10. A closure (4) as claimed in claim 8 wherein said lower face (25a) and said upper face (25b) are radially disposed and said body threads (12) are spaced from said cap outer wall (20).
11. A closure (4) as claimed in claim 10 wherein said threads 12 and 21 are not disposed above the horizontal plane defined by said rim (3).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US33945701P | 2001-12-14 | 2001-12-14 | |
| US60/339,457 | 2001-12-14 | ||
| PCT/CA2002/001905 WO2003051737A2 (en) | 2001-12-14 | 2002-12-12 | Two piece screw cap closure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2470130A1 true CA2470130A1 (en) | 2003-06-26 |
Family
ID=23329073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002470130A Abandoned CA2470130A1 (en) | 2001-12-14 | 2002-12-12 | Two piece screw cap closure |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20050124057A1 (en) |
| AU (1) | AU2002350310A1 (en) |
| CA (1) | CA2470130A1 (en) |
| WO (1) | WO2003051737A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8925755B2 (en) | 2010-04-13 | 2015-01-06 | Ipl, Inc. | Tamper evident system and method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2399814B (en) * | 2003-03-26 | 2007-05-09 | Portola Packaging Ltd | Closures and containers in combination therewith |
| US20070278256A1 (en) * | 2006-06-06 | 2007-12-06 | Law Brian R | Tamper-evident closure for a container |
| GB0702720D0 (en) * | 2007-02-13 | 2007-03-21 | Obrist Closures Switzerland | A ring pull for a closure |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3167202A (en) * | 1964-01-15 | 1965-01-26 | Tolciss Joseph | Closure assembly for container neck |
| US3656668A (en) * | 1969-09-11 | 1972-04-18 | Container Corp | Neck assembly for thin walled container |
| US3700133A (en) * | 1970-12-17 | 1972-10-24 | Continental Can Co | Threaded safety closure |
| US3770156A (en) * | 1971-11-26 | 1973-11-06 | Growth Int Ind Corp | Tamper proof closure |
| US3804139A (en) * | 1973-02-08 | 1974-04-16 | Mauser Kg | Container of synthetic plastic material |
| US4399921A (en) * | 1982-04-09 | 1983-08-23 | Owens-Illinois, Inc. | Child resistant closure and container |
| US4494682A (en) * | 1982-07-07 | 1985-01-22 | Hunt-Wesson Foods, Inc. | Pouring fitment with container and closure therefor |
| GB2191994B (en) * | 1985-12-06 | 1990-07-18 | Goodall Donald T | Inserts for fixing into openings |
| US4785963A (en) * | 1988-01-11 | 1988-11-22 | Rieke Corporation | Tamper-evident buttress plug closure |
| GB9111022D0 (en) * | 1991-05-22 | 1991-07-17 | Ici Plc | Improvement relating to pouring devices for viscous liquid such as paint |
| DE4240485C1 (en) * | 1992-12-02 | 1993-12-16 | Limburg Gmbh Blechwaren | Vessel-outlet seal with cap screwing onto base ring - has two walls on ring enclosing annular groove and third with external thread for cap. |
| GB9322113D0 (en) * | 1993-10-27 | 1993-12-15 | Sturk Ron | Closure for containers |
| US6161711A (en) * | 1998-01-20 | 2000-12-19 | Tri State Distribution, Inc. | Container and closure system |
| DE19807768A1 (en) * | 1998-02-24 | 1999-08-26 | Bericap Gmbh & Co | Closure for bucket or tub-shaped plastic container has inwards directed |
| CN1274578C (en) * | 1998-05-22 | 2006-09-13 | 株式会社吉野工业所 | Holding clamp for bottle plug |
| FR2782500B1 (en) * | 1998-08-03 | 2000-10-13 | Smurfit Socar Sa | SEALING DEVICE, PARTICULARLY FOR CONTAINING FOOD LIQUIDS |
| US6386405B1 (en) * | 2000-12-18 | 2002-05-14 | Royal Packaging Industries Van Leer Nv | Snap on closure and method |
| US6783014B2 (en) * | 2001-06-07 | 2004-08-31 | Rexam Medical Packaging Inc. | Double shell closure with support ribs |
| US20040045967A1 (en) * | 2002-09-11 | 2004-03-11 | Becker Gordon P. | Reclosable metal beverage can |
| CN1816480B (en) * | 2003-05-27 | 2010-06-16 | 美国博得来包装集团公司 | theft protection sealing cover used for container |
-
2002
- 2002-12-12 WO PCT/CA2002/001905 patent/WO2003051737A2/en not_active Application Discontinuation
- 2002-12-12 AU AU2002350310A patent/AU2002350310A1/en not_active Abandoned
- 2002-12-12 US US10/498,528 patent/US20050124057A1/en not_active Abandoned
- 2002-12-12 CA CA002470130A patent/CA2470130A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8925755B2 (en) | 2010-04-13 | 2015-01-06 | Ipl, Inc. | Tamper evident system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2002350310A1 (en) | 2003-06-30 |
| WO2003051737A3 (en) | 2003-10-16 |
| US20050124057A1 (en) | 2005-06-09 |
| WO2003051737A2 (en) | 2003-06-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |