CA1060815A - Push-in easy-opening closures - Google Patents
Push-in easy-opening closuresInfo
- Publication number
- CA1060815A CA1060815A CA122,906A CA122906A CA1060815A CA 1060815 A CA1060815 A CA 1060815A CA 122906 A CA122906 A CA 122906A CA 1060815 A CA1060815 A CA 1060815A
- Authority
- CA
- Canada
- Prior art keywords
- opening
- free edge
- closure member
- sheet metal
- closure
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs
-
- 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
- B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
- B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
- B65D17/401—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall
-
- 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
- B65D2205/00—Venting means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
This specification disclosed an easy-opening closure for a can end which comprises an opening formed by partially severing a portion from the can end to leave the portion attached thereto by an integral neck, and a closure member formed from said severed portion and which is larger than said opening. The sheet metal adjacent the free edge of the opening is downwardly turned while the sheet metal adjacent the free edge of the closure member is upwardly turned, said free edges being in contact with or in close proximity to each other. A sealant is applied at least in the region of the free edges if required by the purpose for which the can end is to be used. The specification also discloses a method of forming such a closure comprising the steps of: forming an upwardly directed bulge in the sheet metal, thus stretching the sheet partially severing a central portion of said bulge, to define an opening and said severed portion defining a closure member for said opening, and displacing the closure member downwardly so that its free edge is below the free edge of the opening; partially flattening the thus truncated bulge of sheet metal around said opening to reduce its size, and turning downwardly said free edge defining said opening;
partially flattening the closure member to increase its size, and turning upwardly said free edge of the closure member, the free edge portion of said closure member being in contact with or in close proximity to said free edge defining said opening, and applying a sealant at least in the region of the free edges of the opening and the closure member to seal the closure if required by the purpose for which said container member is to be used.
This specification disclosed an easy-opening closure for a can end which comprises an opening formed by partially severing a portion from the can end to leave the portion attached thereto by an integral neck, and a closure member formed from said severed portion and which is larger than said opening. The sheet metal adjacent the free edge of the opening is downwardly turned while the sheet metal adjacent the free edge of the closure member is upwardly turned, said free edges being in contact with or in close proximity to each other. A sealant is applied at least in the region of the free edges if required by the purpose for which the can end is to be used. The specification also discloses a method of forming such a closure comprising the steps of: forming an upwardly directed bulge in the sheet metal, thus stretching the sheet partially severing a central portion of said bulge, to define an opening and said severed portion defining a closure member for said opening, and displacing the closure member downwardly so that its free edge is below the free edge of the opening; partially flattening the thus truncated bulge of sheet metal around said opening to reduce its size, and turning downwardly said free edge defining said opening;
partially flattening the closure member to increase its size, and turning upwardly said free edge of the closure member, the free edge portion of said closure member being in contact with or in close proximity to said free edge defining said opening, and applying a sealant at least in the region of the free edges of the opening and the closure member to seal the closure if required by the purpose for which said container member is to be used.
Description
~a~
Thi.s invention relates to easy-opening closures for containers made at least partly from sheet metal 9 such as ~etal can~ for bevera.ges of all kinds~ other liquids, and pourable productsO
The most widely marketed easy~opening closures for be~erage cans are formed in can ends made from aluminium or an aluminium alloyg the closure member being defined by a score line that weakens the metal and having attached to it a pull ring ~or tearing the closure member from the can end~ In another type of closure 7 a tinplate can end has an insart of aluminium that incorporates a closure member ~efined by a score lineO Again, a pull ring is attached to the closure member to enable it to be torn from the can endO
Can ends made` from steel or tinplate and inc~rpor-ating a score line defining an easy~opening closure adapted for removal by a pull ring are also knownO
However~ the disadvantage with such closurss is that the scoring operation causes work hardening ~f the steel, thus ~aking more difficult the easy removal of the closure by the usual tearing operationO The difficulty is accentuated when the edge of the scoring tool becomes rounded in useO Then the strength of the deformed metal can reach levels where the forces necessary to tear the score are higher than tho~e necessary to tear the adjacent ~60~
sheetO As a result9 the tear doe~ not follow the score line and t~e can becomes difficult to open and dangerou~
ln useO
A major disadvantage of such "tear~out" closures is that they are relatively complicated ~nd costly to manufactureO Another disadvantage,,is that the closure member, after being torn from the container9 is usuall~
thrown away thus producing a serious litter problemO
Easy-opening closures which are not torn out of the container have been proposedO Such closures are opened by displacing the closure member into the containe~O
One such proposal is di~closed in Klein ~nd Harper United States Patent NoO 3p334977~ which describes a closure formed by drawing and shaping the sheet metal so that it is underfolded in two superimposed 180 folds, $he push~
in closure member or gate panel being defined by a score cut near $he lower of these foldsO Since access to the sheet metal is available only f~om the undersids 9 a conventional shearing operation is not possible an~ the score cut must be made by foroing a knife into the ~heet metalO This constitutes a major disadv~ntage because the service life of such a knife is likely to be short when the closure is made from steel or tinplate especiall~
when these are of high temperO Another disadvantage is that the formation of tha superimposed 180 folds involves . .
~6~ 5 sev_re deformation of the sheet metal and this can cause stress cracking especially if the formation is attempted at high speed.
The primary object of the invention is therefore to provide an easy-opening closure that can be readily and economically formed from steel or tinplate and that avoides the abovementioned disadvantages. Another object of the invention is to provide an easy-open:ing closure that can be economically formed from aluminium or aluminium alloy and that has a closure member which is not removed from the confines of the container when the closure is opened thus reducing the litter problem.
According to one aspect of the present invention, there is provided a method of forming a push-in easy-opening closure in a sheet metal container member for use ln a container suitable for containing carbonated beverages comprising partially severing a portion of the sheet metal from one surface thereof to the other to form an opening defined by a free edge of the sheet metal, said severed portion defining a closure member having a free edge portion, at least one unsevered area connecting said closure member to the remainder of said sheet metal and serving as a hinge during the closure opening operation; cold working a marginal portion of the sheet metal adjacent said Eree edge of the opening to reduce the size of said opening and to place at least a substantial part of said free edge of the opening in overlapping relation-ship over said free edge portion of said closure member; and then applying a sealant to seal the closure member in said overlapping relationship. ~herein thc cold working of said free edge comprises forming a bulge in an area of the sheet metal, said severed portion being within said bulge, and at least partly flattening said bulge in said marginal portion to produce said overlapping relationsllip.
J
6~ 5 The closure member is larger than the opening in order that any internal pressure arising from the contents, e.g. carbonated beverages, of the container is resisted by the overlap.
In the present specification, the term "container member" is intended to include any integral part of a container, such as part of the container body, a container end or an insert adapted to form part of a container body or end. The term "sheet metall' includes steel, tinplate, aluminium and its alloys, other metals suitable for container manufacture, and laminates of these metals with relatively thin plastics films. The term "severing" means an incision extending through the full thickness of the sheet metal from one surface to the ~ther. Thus "partially severing portion of the sheet metal" means that such portion remains attached to the parent metal only by one or more necks of unincised metal between the two ends of the incision or incisions. The term "free edge" means the metal surface created by the incision and includes the corners defining said surface. The term "free edge portion" includes the free edge as defined as well as the sheet metal adjacent to the corners of the free edge.
The term "close proximity" includes spacings such that a seal effective for the purpose for which the container member is to be used is obtained by the use of a suitable conventional sealan-t. In the case of constructions not requiring sealant, say for powders, the term includes spacings such that the contents of the container can not escape.
When the contents of the container are at or below atmospheric pressure/ the invention provides an easy-opening J
,~L~ in closure as hereinbefore described and in which a segment or segments of the free edge portion of the closure member are formed to extend over the exterior surface of the sheet metal adjacent to the opening. The extent to which this overlap occurs :is designed to resist opening of the closure by atmoshperic pressure or accidental contact but to allow open:ing of the closure by finger pressure.
In order that the invention may be more clearly understood, some preferred embodiments thereof will now be described, by way of example, with reference to the accompanying drawings, in which:-Figure 1 is a plan view of one form of a can endembodying the invention;
Figure 2 is a sectional elevation view taken along the line 2-2 of Figure l;
Figure 3 is an enlarged plan view of one closure of the can end of Figure l;
Figure 4 is a plan view of a form of can end suitable for containers having contents at or below atmospheric pressure;
J
Figure 5 i9 a plan view of a modlfied form of can end suitable for containers wi-th contents at or below ~tmospheric pressure;
Figure 6 is a sectional elevation view taken along the line 9~9 of Figure 3 and shows the first stage in the ~ormation of a closure in the can end shown in the preced-ing Figures;
Figures 79 8 and 9 are sectional elevation views taken along line 9-9 of Figure 3 and of Figure 4 sho~ing succes-sive stages in the formation of the said closure;
Figure 10 is a sectional elevation view taken along the line lO-lO of Figure 3;
Figure 11 is a sectional elevation view taken along the line 11-11 o~ Figure 4 and o~ Figure 5;
Figure 12 is a sectional elevation view taken along the line 12-12 of Figure 5;
~ igure 13 is a plan view of yet another form of can end;
Figure 14 is a cross section on line 14-14 of Figure 13; and Figures 15 to 17 show the method of forming the closure .,~ 1~ I't . 12c of Figures ~ and kg in its successive stages.
~or clarity the Figures show the configurations o~
the metal defining the closure during the various stages of formation in a somewhat exaggerated and idealized formO
The actual configurations may therefore depart from those shown.
The can end lO shown in the drawings comprises a circular disc-,of tinplate, the rim of which is preformed (Fig. 2) in the usual way for subsequent attachment by a .
6~
seaming operation to the upper end of a can body.
The can end 10 is provided with a diametrically opposed pair of easy-opening closures each including an integral push-in closure member 12 which has been severed from the disc and each o-f which remains connected thereto by a narrow neck 14 which is best shown in Figures 3 and 10, each such neck being arranged centrally at the outer end of the respective closure member 12 and serving as a hinge during the closure opening operation.
The particularlocation of the neck or hinge 14 ~ith respect to closure member 12 has been chosen to strengthen the can end in resisting internal pressure created by the contents of the canO However, other locations can be used providing the can end can resist the maximum internal pressure for the particular applicationO
The formation of each closure member 12 in the can end 10 provides a corresponding opening 16 defined by the free edge 17 of the can end 10 which is created by the severing of closure member 12 from the can end 10 but each such opening is completely covered and sealed by the respective closure member 12 until the latter is sub-sequently pressed dounwardly, as shown in broken lines in Figure 10, to open the closure. It will be appreciated that only one such closure member 12 need be formed in the ... . ..
end 10 and that the closure or closures may assume any 3 ~
. ~ ., ~(~6~
desired shape or configuration~ The shape shown in the dra~ings has been chosen both for its pouring character-istics and its aesthetic appealO
As best seen in Figures 9 and 10, the free edge 18 of the free edge portion 19 of the closure member 12 is in contact with or in close proximity to the free edge 17 of the opening 16. The closure member 12 is most desirably formed so as to be resiliently biased towards the opening 16 so that contact with the free edge 17 of the opening occurs at least around some of its peripheryO
Clearly, since the closure member lZ has part of its free edge 18 beyond or outside the free edge 17 of the opening 16, the area of the closure member 12 is larger than that of the opening 16. The amount of overlap between the closure member 12 and the opening 16 is indicated by the distance 'x~ in the various ~igures. Hence, the closure member will be positively restrained from being displaced upwardly by internal pressure in a can to which the end 10 is applied. The application of a suitable sealant S
to seal any gap between the free edge 18 of the closure member 12 and the free e~ge 17 opening 16 results in the closure providing an hermetically sealed can after filling and completionO To gain access to the contents, the closure member may be readily pushed downwardly as shown
Thi.s invention relates to easy-opening closures for containers made at least partly from sheet metal 9 such as ~etal can~ for bevera.ges of all kinds~ other liquids, and pourable productsO
The most widely marketed easy~opening closures for be~erage cans are formed in can ends made from aluminium or an aluminium alloyg the closure member being defined by a score line that weakens the metal and having attached to it a pull ring ~or tearing the closure member from the can end~ In another type of closure 7 a tinplate can end has an insart of aluminium that incorporates a closure member ~efined by a score lineO Again, a pull ring is attached to the closure member to enable it to be torn from the can endO
Can ends made` from steel or tinplate and inc~rpor-ating a score line defining an easy~opening closure adapted for removal by a pull ring are also knownO
However~ the disadvantage with such closurss is that the scoring operation causes work hardening ~f the steel, thus ~aking more difficult the easy removal of the closure by the usual tearing operationO The difficulty is accentuated when the edge of the scoring tool becomes rounded in useO Then the strength of the deformed metal can reach levels where the forces necessary to tear the score are higher than tho~e necessary to tear the adjacent ~60~
sheetO As a result9 the tear doe~ not follow the score line and t~e can becomes difficult to open and dangerou~
ln useO
A major disadvantage of such "tear~out" closures is that they are relatively complicated ~nd costly to manufactureO Another disadvantage,,is that the closure member, after being torn from the container9 is usuall~
thrown away thus producing a serious litter problemO
Easy-opening closures which are not torn out of the container have been proposedO Such closures are opened by displacing the closure member into the containe~O
One such proposal is di~closed in Klein ~nd Harper United States Patent NoO 3p334977~ which describes a closure formed by drawing and shaping the sheet metal so that it is underfolded in two superimposed 180 folds, $he push~
in closure member or gate panel being defined by a score cut near $he lower of these foldsO Since access to the sheet metal is available only f~om the undersids 9 a conventional shearing operation is not possible an~ the score cut must be made by foroing a knife into the ~heet metalO This constitutes a major disadv~ntage because the service life of such a knife is likely to be short when the closure is made from steel or tinplate especiall~
when these are of high temperO Another disadvantage is that the formation of tha superimposed 180 folds involves . .
~6~ 5 sev_re deformation of the sheet metal and this can cause stress cracking especially if the formation is attempted at high speed.
The primary object of the invention is therefore to provide an easy-opening closure that can be readily and economically formed from steel or tinplate and that avoides the abovementioned disadvantages. Another object of the invention is to provide an easy-open:ing closure that can be economically formed from aluminium or aluminium alloy and that has a closure member which is not removed from the confines of the container when the closure is opened thus reducing the litter problem.
According to one aspect of the present invention, there is provided a method of forming a push-in easy-opening closure in a sheet metal container member for use ln a container suitable for containing carbonated beverages comprising partially severing a portion of the sheet metal from one surface thereof to the other to form an opening defined by a free edge of the sheet metal, said severed portion defining a closure member having a free edge portion, at least one unsevered area connecting said closure member to the remainder of said sheet metal and serving as a hinge during the closure opening operation; cold working a marginal portion of the sheet metal adjacent said Eree edge of the opening to reduce the size of said opening and to place at least a substantial part of said free edge of the opening in overlapping relation-ship over said free edge portion of said closure member; and then applying a sealant to seal the closure member in said overlapping relationship. ~herein thc cold working of said free edge comprises forming a bulge in an area of the sheet metal, said severed portion being within said bulge, and at least partly flattening said bulge in said marginal portion to produce said overlapping relationsllip.
J
6~ 5 The closure member is larger than the opening in order that any internal pressure arising from the contents, e.g. carbonated beverages, of the container is resisted by the overlap.
In the present specification, the term "container member" is intended to include any integral part of a container, such as part of the container body, a container end or an insert adapted to form part of a container body or end. The term "sheet metall' includes steel, tinplate, aluminium and its alloys, other metals suitable for container manufacture, and laminates of these metals with relatively thin plastics films. The term "severing" means an incision extending through the full thickness of the sheet metal from one surface to the ~ther. Thus "partially severing portion of the sheet metal" means that such portion remains attached to the parent metal only by one or more necks of unincised metal between the two ends of the incision or incisions. The term "free edge" means the metal surface created by the incision and includes the corners defining said surface. The term "free edge portion" includes the free edge as defined as well as the sheet metal adjacent to the corners of the free edge.
The term "close proximity" includes spacings such that a seal effective for the purpose for which the container member is to be used is obtained by the use of a suitable conventional sealan-t. In the case of constructions not requiring sealant, say for powders, the term includes spacings such that the contents of the container can not escape.
When the contents of the container are at or below atmospheric pressure/ the invention provides an easy-opening J
,~L~ in closure as hereinbefore described and in which a segment or segments of the free edge portion of the closure member are formed to extend over the exterior surface of the sheet metal adjacent to the opening. The extent to which this overlap occurs :is designed to resist opening of the closure by atmoshperic pressure or accidental contact but to allow open:ing of the closure by finger pressure.
In order that the invention may be more clearly understood, some preferred embodiments thereof will now be described, by way of example, with reference to the accompanying drawings, in which:-Figure 1 is a plan view of one form of a can endembodying the invention;
Figure 2 is a sectional elevation view taken along the line 2-2 of Figure l;
Figure 3 is an enlarged plan view of one closure of the can end of Figure l;
Figure 4 is a plan view of a form of can end suitable for containers having contents at or below atmospheric pressure;
J
Figure 5 i9 a plan view of a modlfied form of can end suitable for containers wi-th contents at or below ~tmospheric pressure;
Figure 6 is a sectional elevation view taken along the line 9~9 of Figure 3 and shows the first stage in the ~ormation of a closure in the can end shown in the preced-ing Figures;
Figures 79 8 and 9 are sectional elevation views taken along line 9-9 of Figure 3 and of Figure 4 sho~ing succes-sive stages in the formation of the said closure;
Figure 10 is a sectional elevation view taken along the line lO-lO of Figure 3;
Figure 11 is a sectional elevation view taken along the line 11-11 o~ Figure 4 and o~ Figure 5;
Figure 12 is a sectional elevation view taken along the line 12-12 of Figure 5;
~ igure 13 is a plan view of yet another form of can end;
Figure 14 is a cross section on line 14-14 of Figure 13; and Figures 15 to 17 show the method of forming the closure .,~ 1~ I't . 12c of Figures ~ and kg in its successive stages.
~or clarity the Figures show the configurations o~
the metal defining the closure during the various stages of formation in a somewhat exaggerated and idealized formO
The actual configurations may therefore depart from those shown.
The can end lO shown in the drawings comprises a circular disc-,of tinplate, the rim of which is preformed (Fig. 2) in the usual way for subsequent attachment by a .
6~
seaming operation to the upper end of a can body.
The can end 10 is provided with a diametrically opposed pair of easy-opening closures each including an integral push-in closure member 12 which has been severed from the disc and each o-f which remains connected thereto by a narrow neck 14 which is best shown in Figures 3 and 10, each such neck being arranged centrally at the outer end of the respective closure member 12 and serving as a hinge during the closure opening operation.
The particularlocation of the neck or hinge 14 ~ith respect to closure member 12 has been chosen to strengthen the can end in resisting internal pressure created by the contents of the canO However, other locations can be used providing the can end can resist the maximum internal pressure for the particular applicationO
The formation of each closure member 12 in the can end 10 provides a corresponding opening 16 defined by the free edge 17 of the can end 10 which is created by the severing of closure member 12 from the can end 10 but each such opening is completely covered and sealed by the respective closure member 12 until the latter is sub-sequently pressed dounwardly, as shown in broken lines in Figure 10, to open the closure. It will be appreciated that only one such closure member 12 need be formed in the ... . ..
end 10 and that the closure or closures may assume any 3 ~
. ~ ., ~(~6~
desired shape or configuration~ The shape shown in the dra~ings has been chosen both for its pouring character-istics and its aesthetic appealO
As best seen in Figures 9 and 10, the free edge 18 of the free edge portion 19 of the closure member 12 is in contact with or in close proximity to the free edge 17 of the opening 16. The closure member 12 is most desirably formed so as to be resiliently biased towards the opening 16 so that contact with the free edge 17 of the opening occurs at least around some of its peripheryO
Clearly, since the closure member lZ has part of its free edge 18 beyond or outside the free edge 17 of the opening 16, the area of the closure member 12 is larger than that of the opening 16. The amount of overlap between the closure member 12 and the opening 16 is indicated by the distance 'x~ in the various ~igures. Hence, the closure member will be positively restrained from being displaced upwardly by internal pressure in a can to which the end 10 is applied. The application of a suitable sealant S
to seal any gap between the free edge 18 of the closure member 12 and the free e~ge 17 opening 16 results in the closure providing an hermetically sealed can after filling and completionO To gain access to the contents, the closure member may be readily pushed downwardly as shown
2~ in Figure 10 and when so displaced remai.ns attached by i~G~
neck 14 to the can end lOo The sealants may be any suitable polymer, either natural or synthetic. Typical sealants that may be used are those based on polyvinyl chloride, polyvinyl dichloride, polyethylene or its copolymers, polyamides, and the likeO
Conceivably, soft solder could also be used. The coating of lacquer commonly applied to the interior surfaces of metal containers may serve to seal the closure.
If a relatively viscous sealant is applied to the interior of the closure, unsightly penetration of sealant to $he exterior does not take place even if the closure member is not in as close proximity to the opening as w~uld have to be the case when a relatively fluid sealant is used. In both cases, the objective is to prevent unsightly penetration of sealant to the exterior sur~ace of the clos-ure, and to obtain an e~fective seal after the sealant has been subjected to the normal curing processO We ha~a found that when using a conventional polyvinyl chloride resin with a plastisol, for example a commercial product made by W~Ro Grace Australia Ltdo an~ known as Darex cap compound no. 6385-A4, the proximity of the closure member to the opening is not critical, and a gap o~ a few thousandths of an inch (a few 0.025 mm) can be tolerated without dif~iculty.
J ~o ~.
The general method of forming each closure 12 is illustrated in successive stages in Figures 6, 7~ 8 and 9 though it will be apparent to those skilled in the art that the required result is not dependent upon using the particular shapes which are illustrated and that the number of forming operations could be reduced or increasedO
Referring to Figure 6, an upward bulge 20 is formed initially in can end 10, either before, after or during formation of its rim, thu~ stretching the sheet metal within the region of the bulge 20~ The bulge 20 has ~
shoulder~22 where tha metal is generally parallel to the plane of the undeformed sheet metal around the bulge Z0, In the succeeding operation shown in Figure 7, a generally central portion 24 of the bulge 20 is partially severed approximately centrally o~ the shoulder 22, thus defining the portion which will be formed into the clos~re member 12 and also defining the opening 16~ The portion 24 which remains connected to the can end by the unineised neck 14 of sheet metal not visible i~ Figures 6 to 9, i5 also displaced downwardly so thak its free edge 18 is below the free edge 17 defining the opening 160 As Figure 7 clearly shows, the portion 24 and the openi~g 16 are surrounded by ~lat rims, formerly parts of the shoulder J ,/
~o~o~
In the next operation shown in Figure 8, the truncated portion of bulge 20 around the opening 16 including the flat rim is partially flattened, thus reducing the size of the opening 16 by forcing its free edge 17 inwardly. The free edge 17 is also turned downwardly, which has the important result of presenting a smooth periphery to the opener's fingers or lips should he drink from the can.
In the final operation shown in Figure 9, the closure member 12 is at least partially flattened, (shown in the drawings as completely flattened) thus increasing its size by forcing its free edge 18 outwardly. The free edge 18 is also turned upwardly so that it is in contact with or at least in close proximity to the free edge 17 of the opening 16. The upward turning of the free edge of the closure member has the advantage that any fin F of raw and ragged metal produced by the shearing operation at the lower corner of the free edge 18 of the closure member 12 is located more definitely in the region of application of sealant S around the gap. The covering of the fin F with sealant is desirable in order to prevent contact of raw metal ~0 with the contents of the can.
As those skilled in the art will appreciate, the steps shown in Figures 6 and 7 may be performed in one die operation.
Similarly, the steps shown in Figures 8 and 9 may also be performed simultaneously, the sealant ~36~
application normally being a separate operationO
The downward and upward turning of the free edges of the opening and the closure member respectively is of course achieved by the use of suitably shaped dies. Using known techniques, the dies are also designed so that the closure member is resiliently biased towards the opening as previously mentionedO
The desirable amount of overlap x depends inter alia on the size of the closure, the properties of the sheet metal, and the pressure in the container for which the can end is made. By way of example, an end for a beer can made from high temper tinplate about 00012 inches (003 mm) thick, ~e have found that an overlap x of 00015 inches (0038 mm) is very satisfactory.
It will be appreciated that complete overlap between the free edges 17 and 18 may be desirable and in such a case, the free edge 17 is preferably disposed outwardly of and above the level of free edge 180 Here the contact or close proximity may be between free edge 17 and the outside surface of free edge portion 19 or bet~een free edge 18 and the interior surface of can end 10 adjacent opening 160 However, it should be appreciated that complete overlap is not essential and that the embodiment described above is a commercially workable and acceptable embodiment.
J ~
MaI1Y a:Lternative~ exi.s-t for obtaining the desired overlap between the c:Losure member and the opening~t. though some of these have obvious disadvanta6res.
For example, the whole of the bulge or only the central portion of it ~alling within the shoulder may be : formed downwardly~
In this case, there is contact (or close proximity) between the interior surface of the can end and the exterior surface of the free edge portion of the closure member.
Another alternative construction is shown in Figures 13 to 17 where parts similar to those of the first embodiment are indica-ted by the suffix "c".
As in the first embodiment, the closure member 12c ----remains connected to the end 10c by a neck 14c of metal and the free edge 18c of the free edge portion l9c is disposed beyond or outside the free edge 17c of the opening 16c. However, the edge portion l9c and the edge 17c are not turned upwardlv and ~ownwardly but remain in their severed orientation às clear].y shown in Figure 14. It will be seen -that there is contact (or close proximity) between the free edge 17c and the exterior surface of the free edge por-tion l9c.
i~.
Tlle method of ~o~ n~lng ~he clasure 12c is illustrat~,d ;n its success:ive stages in ~igures 1~, 16 and 1~'~ In the first stage ('Figure :l5) an upward flat-toppecl bulge 20c is ~orllled to the heigh-t of shoulder 22 of the first embodimeDt. In the ` ' second stage (Figure 16) a generally central portion 24c of the bulge 20c is severed from end lOc, except for a portion defining the neck 14c, and the severed portion is displaced do~nwardly so that its free edge 18c is below the free end~e 17c of the opening. The final stage (Figure 17) involves the partial flattening of the truncated bulge around the opening to reduce the opening to a size smaller than the size o~ the closure member 12c, and then ''the application of a sealant S as in the first embodiment.
Alternatively again~ the bulge may be annular in shape with the central portion being in the plane of the undeformed sheet or at any rate lower than the height of the annulus. Severance of the metal around the highest part of the annulus then defines an opening and a closure member each having a raised rim which when partiall,v flattened reduces the size of the opening and increases the size of the closure member.
J ~
In the can end shown in Figures 4 and 11~ where parts similar to those of the previous embodiment are indicated by the suffix ~a'~ suitable for contents at atmospheric pressure or below, the closure tnember 12a has some of its free edge portion l9a at 25 in contact with or closely overlying the exterior surface ~f the can end 10. This prevents $he closure member 12a from being opened by accidental contact or by atmospheric pressurs.
In practlce, the ~idth of the overlap between edge 1.5 and the periphery of the opening would be much l.ess th~n that shown in Figure 4 and even in Figure llo At each ex-tremity of the overlap 25, a short incision may be made in the edge of the closure member 12a in order to facil-itate the change in pOsitiQn of the edge 18a from the interior surface to the exterior surface of the can endO
Figures 5 and 12, where the suffix Ib' is used, shows an alternative easy-openi.ng closure which has three segments 25b of free edge l9b on the exterior surf~ce of the can end.
In each of the embodiments, the easy-opening closure and the immediately surrounding parts of the can end may be covered by a removable adhesive coverin~ strip of paper~ plas*ic film or other suitable material if this is found desirable for reasons of hygieneO
-- ~6 --~G
The embodiments described are primarily intended for cans havi~g liquid contents. Cans for powdered~
granular or other non-liquid contents would not essentially require a sealant since a small dab of adhesive in one or more places around the closure member would be satisfactoryO
The closure would of course be designed so that any gap between the closure and opening would not allow the contents to escape. For substances such as salt and pepper, perforated caps may be provided t~ fit into the opening after the closure member has been displaced.
In the easy-opening closure défined above~ and all other closures embodying the essential features of the invention there is an essential difference between our invention and that disclosed in UOSo Patent 3~334,7750 Whereas in our invention, the closure member is larger than the opening as defined by its free edge, the gate panel or closure member in said disclosure is larger than the opening defined by the conve~ rim of the upper 180 fold and is not larger than the opening defined by the score cut. In fact~ the gate panel may be considered to be smaller than the opening defined by the score cut by an ~mount of the width of the cuto Furthermore our closures do not require severe metal deformation during their formationO Accordingly, when our closures ~re formed from high temper (e.gO Temper 6) or double reduced _ ~ _ steel the metal does not suffer from stress cracks and therefore such closures have distinct advantages over the above UOS, art. When formed from low temper steel (such as for contents at atmospheric pressure) the closures have the advantage that their ~ormation is simple ~nd economicO
/~
neck 14 to the can end lOo The sealants may be any suitable polymer, either natural or synthetic. Typical sealants that may be used are those based on polyvinyl chloride, polyvinyl dichloride, polyethylene or its copolymers, polyamides, and the likeO
Conceivably, soft solder could also be used. The coating of lacquer commonly applied to the interior surfaces of metal containers may serve to seal the closure.
If a relatively viscous sealant is applied to the interior of the closure, unsightly penetration of sealant to $he exterior does not take place even if the closure member is not in as close proximity to the opening as w~uld have to be the case when a relatively fluid sealant is used. In both cases, the objective is to prevent unsightly penetration of sealant to the exterior sur~ace of the clos-ure, and to obtain an e~fective seal after the sealant has been subjected to the normal curing processO We ha~a found that when using a conventional polyvinyl chloride resin with a plastisol, for example a commercial product made by W~Ro Grace Australia Ltdo an~ known as Darex cap compound no. 6385-A4, the proximity of the closure member to the opening is not critical, and a gap o~ a few thousandths of an inch (a few 0.025 mm) can be tolerated without dif~iculty.
J ~o ~.
The general method of forming each closure 12 is illustrated in successive stages in Figures 6, 7~ 8 and 9 though it will be apparent to those skilled in the art that the required result is not dependent upon using the particular shapes which are illustrated and that the number of forming operations could be reduced or increasedO
Referring to Figure 6, an upward bulge 20 is formed initially in can end 10, either before, after or during formation of its rim, thu~ stretching the sheet metal within the region of the bulge 20~ The bulge 20 has ~
shoulder~22 where tha metal is generally parallel to the plane of the undeformed sheet metal around the bulge Z0, In the succeeding operation shown in Figure 7, a generally central portion 24 of the bulge 20 is partially severed approximately centrally o~ the shoulder 22, thus defining the portion which will be formed into the clos~re member 12 and also defining the opening 16~ The portion 24 which remains connected to the can end by the unineised neck 14 of sheet metal not visible i~ Figures 6 to 9, i5 also displaced downwardly so thak its free edge 18 is below the free edge 17 defining the opening 160 As Figure 7 clearly shows, the portion 24 and the openi~g 16 are surrounded by ~lat rims, formerly parts of the shoulder J ,/
~o~o~
In the next operation shown in Figure 8, the truncated portion of bulge 20 around the opening 16 including the flat rim is partially flattened, thus reducing the size of the opening 16 by forcing its free edge 17 inwardly. The free edge 17 is also turned downwardly, which has the important result of presenting a smooth periphery to the opener's fingers or lips should he drink from the can.
In the final operation shown in Figure 9, the closure member 12 is at least partially flattened, (shown in the drawings as completely flattened) thus increasing its size by forcing its free edge 18 outwardly. The free edge 18 is also turned upwardly so that it is in contact with or at least in close proximity to the free edge 17 of the opening 16. The upward turning of the free edge of the closure member has the advantage that any fin F of raw and ragged metal produced by the shearing operation at the lower corner of the free edge 18 of the closure member 12 is located more definitely in the region of application of sealant S around the gap. The covering of the fin F with sealant is desirable in order to prevent contact of raw metal ~0 with the contents of the can.
As those skilled in the art will appreciate, the steps shown in Figures 6 and 7 may be performed in one die operation.
Similarly, the steps shown in Figures 8 and 9 may also be performed simultaneously, the sealant ~36~
application normally being a separate operationO
The downward and upward turning of the free edges of the opening and the closure member respectively is of course achieved by the use of suitably shaped dies. Using known techniques, the dies are also designed so that the closure member is resiliently biased towards the opening as previously mentionedO
The desirable amount of overlap x depends inter alia on the size of the closure, the properties of the sheet metal, and the pressure in the container for which the can end is made. By way of example, an end for a beer can made from high temper tinplate about 00012 inches (003 mm) thick, ~e have found that an overlap x of 00015 inches (0038 mm) is very satisfactory.
It will be appreciated that complete overlap between the free edges 17 and 18 may be desirable and in such a case, the free edge 17 is preferably disposed outwardly of and above the level of free edge 180 Here the contact or close proximity may be between free edge 17 and the outside surface of free edge portion 19 or bet~een free edge 18 and the interior surface of can end 10 adjacent opening 160 However, it should be appreciated that complete overlap is not essential and that the embodiment described above is a commercially workable and acceptable embodiment.
J ~
MaI1Y a:Lternative~ exi.s-t for obtaining the desired overlap between the c:Losure member and the opening~t. though some of these have obvious disadvanta6res.
For example, the whole of the bulge or only the central portion of it ~alling within the shoulder may be : formed downwardly~
In this case, there is contact (or close proximity) between the interior surface of the can end and the exterior surface of the free edge portion of the closure member.
Another alternative construction is shown in Figures 13 to 17 where parts similar to those of the first embodiment are indica-ted by the suffix "c".
As in the first embodiment, the closure member 12c ----remains connected to the end 10c by a neck 14c of metal and the free edge 18c of the free edge portion l9c is disposed beyond or outside the free edge 17c of the opening 16c. However, the edge portion l9c and the edge 17c are not turned upwardlv and ~ownwardly but remain in their severed orientation às clear].y shown in Figure 14. It will be seen -that there is contact (or close proximity) between the free edge 17c and the exterior surface of the free edge por-tion l9c.
i~.
Tlle method of ~o~ n~lng ~he clasure 12c is illustrat~,d ;n its success:ive stages in ~igures 1~, 16 and 1~'~ In the first stage ('Figure :l5) an upward flat-toppecl bulge 20c is ~orllled to the heigh-t of shoulder 22 of the first embodimeDt. In the ` ' second stage (Figure 16) a generally central portion 24c of the bulge 20c is severed from end lOc, except for a portion defining the neck 14c, and the severed portion is displaced do~nwardly so that its free edge 18c is below the free end~e 17c of the opening. The final stage (Figure 17) involves the partial flattening of the truncated bulge around the opening to reduce the opening to a size smaller than the size o~ the closure member 12c, and then ''the application of a sealant S as in the first embodiment.
Alternatively again~ the bulge may be annular in shape with the central portion being in the plane of the undeformed sheet or at any rate lower than the height of the annulus. Severance of the metal around the highest part of the annulus then defines an opening and a closure member each having a raised rim which when partiall,v flattened reduces the size of the opening and increases the size of the closure member.
J ~
In the can end shown in Figures 4 and 11~ where parts similar to those of the previous embodiment are indicated by the suffix ~a'~ suitable for contents at atmospheric pressure or below, the closure tnember 12a has some of its free edge portion l9a at 25 in contact with or closely overlying the exterior surface ~f the can end 10. This prevents $he closure member 12a from being opened by accidental contact or by atmospheric pressurs.
In practlce, the ~idth of the overlap between edge 1.5 and the periphery of the opening would be much l.ess th~n that shown in Figure 4 and even in Figure llo At each ex-tremity of the overlap 25, a short incision may be made in the edge of the closure member 12a in order to facil-itate the change in pOsitiQn of the edge 18a from the interior surface to the exterior surface of the can endO
Figures 5 and 12, where the suffix Ib' is used, shows an alternative easy-openi.ng closure which has three segments 25b of free edge l9b on the exterior surf~ce of the can end.
In each of the embodiments, the easy-opening closure and the immediately surrounding parts of the can end may be covered by a removable adhesive coverin~ strip of paper~ plas*ic film or other suitable material if this is found desirable for reasons of hygieneO
-- ~6 --~G
The embodiments described are primarily intended for cans havi~g liquid contents. Cans for powdered~
granular or other non-liquid contents would not essentially require a sealant since a small dab of adhesive in one or more places around the closure member would be satisfactoryO
The closure would of course be designed so that any gap between the closure and opening would not allow the contents to escape. For substances such as salt and pepper, perforated caps may be provided t~ fit into the opening after the closure member has been displaced.
In the easy-opening closure défined above~ and all other closures embodying the essential features of the invention there is an essential difference between our invention and that disclosed in UOSo Patent 3~334,7750 Whereas in our invention, the closure member is larger than the opening as defined by its free edge, the gate panel or closure member in said disclosure is larger than the opening defined by the conve~ rim of the upper 180 fold and is not larger than the opening defined by the score cut. In fact~ the gate panel may be considered to be smaller than the opening defined by the score cut by an ~mount of the width of the cuto Furthermore our closures do not require severe metal deformation during their formationO Accordingly, when our closures ~re formed from high temper (e.gO Temper 6) or double reduced _ ~ _ steel the metal does not suffer from stress cracks and therefore such closures have distinct advantages over the above UOS, art. When formed from low temper steel (such as for contents at atmospheric pressure) the closures have the advantage that their ~ormation is simple ~nd economicO
/~
Claims (12)
1. A method of forming a push-in easy-opening closure in a sheet metal container member for use in a container suitable for containing carbonated beverages comprising partially severing a portion of the sheet metal from one surface thereof to the other to form an opening defined by a free edge of the sheet metal, said severed portion defining a closure member having a free edge portion, at least one unsevered area connecting said closure member to the remainder of said sheet metal and serving as a hinge during the closure opening operation; cold working a marginal portion of the sheet metal adjacent said free edge of the opening to reduce the size of said opening and to place at least a substantial part of said free edge of the opening in overlapping relation-ship over said free edge portion of said closure member; and then applying a sealant to seal the closure member in said overlapping relationship, wherein the cold working of said free edge comprises forming a bulge in an area of the sheet metal, said severed portion being within said bulge, and at least partly flattening said bulge in said marginal portion to produce said overlapping relationship.
2. A method according to Claim 1, further characterized in that said formation of said bulge displaces said sheet metal generally normally of the sheet.
3. A method of forming a push-in easy-opening closure in a sheet metal container member for use in a container suitable for containing carbonated beverages comprising the following steps:
(1) forming a bulge in the sheet metal, thus stretching the sheet;
(2) partially severing a central portion of said bulge from one surface of the sheet metal to the other to provide a free edge defining an opening, said severed portion defining a closure member having a free edge portion, at least one unsevered area connecting said closure member to the remainder of said sheet metal and serving as a hinge during the closure opening operation;
(3) displacing the closure member in the opposite direction from said bulge so that its free edge portion is in a different plane from the free edge of the opening;
(4) at least partially flattening the bulge of sheet metal in a marginal portion of the sheet metal adjacent said free edge of said opening to reduce the size of said opening and to place at least a substantial part of said free edge of the opening in overlapping relationship over said free edge portion of said closure, and (5) applying a sealant at least in the region of the free edge of the opening and the free edge portion of the closure member to seal the closure member whereby said container member having said easy-opening closure is suitable for use in forming a container for carbonated beverages.
(1) forming a bulge in the sheet metal, thus stretching the sheet;
(2) partially severing a central portion of said bulge from one surface of the sheet metal to the other to provide a free edge defining an opening, said severed portion defining a closure member having a free edge portion, at least one unsevered area connecting said closure member to the remainder of said sheet metal and serving as a hinge during the closure opening operation;
(3) displacing the closure member in the opposite direction from said bulge so that its free edge portion is in a different plane from the free edge of the opening;
(4) at least partially flattening the bulge of sheet metal in a marginal portion of the sheet metal adjacent said free edge of said opening to reduce the size of said opening and to place at least a substantial part of said free edge of the opening in overlapping relationship over said free edge portion of said closure, and (5) applying a sealant at least in the region of the free edge of the opening and the free edge portion of the closure member to seal the closure member whereby said container member having said easy-opening closure is suitable for use in forming a container for carbonated beverages.
4. The method as claimed in Claim 1, 2 or 3, wherein said bulge includes an approximately flat area of sheet metal that is generally parallel to the plane of the sheet metal surrounding said bulge, said severing being carried out sub-stantially within said flat area.
5. The method as claimed in Claim 1, 2 or 3, wherein said sheet metal is steel.
6. The method as claimed in Claim 1, 2 or 3, wherein said sealant is applied to at least the region of the free edge of said opening and the free edge portion of said closure member.
7. The method as claimed in Claim 1, 2 or 3, wherein the size of said closure member is increased prior to the application of said sealant.
8. The method as claimed in Claim 1, 2 or 3, wherein said free edge portion of said closure member has a plurality of segments, at least one of said segments overlying a surface of the sheet metal adjacent said opening.
9. The method as claimed in Claim 1, 2 or 3, wherein said closure member is bulged, and after severing the bulged closure member is flattened to increase the size thereof.
10. The method as claimed in Claim 1, 2 or 3, wherein the bulging and severing are performed in a single operation.
11. The method as claimed in Claim 1, 2 or 3, wherein the free edge defining said opening is turned from the plane of the sheet metal and away from the outside surface of the container member to present an opening periphery which is substantially free of the danger of cutting an opener's finger.
12. The method according to Claim 1, 2 or 3, wherein the metal of said marginal portion has been initially cold worked prior to reducing the size of said opening.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPA255670 | 1970-09-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1060815A true CA1060815A (en) | 1979-08-21 |
Family
ID=3764703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA122,906A Expired CA1060815A (en) | 1970-09-16 | 1971-09-15 | Push-in easy-opening closures |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3759206A (en) |
| JP (1) | JPS5618456B1 (en) |
| BR (1) | BR7106052D0 (en) |
| CA (1) | CA1060815A (en) |
| DE (1) | DE2146452C3 (en) |
| FR (1) | FR2106562B1 (en) |
| GB (1) | GB1361784A (en) |
| ZA (1) | ZA716200B (en) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3929251A (en) * | 1972-08-17 | 1975-12-30 | Aluminum Co Of America | Container wall with rupturable weakening line |
| AU472489B2 (en) * | 1973-05-15 | 1976-05-27 | Broken Hill Proprietary Company Limited, The | Hinge displacement pushin easy-opening closures |
| US3886881A (en) * | 1973-12-03 | 1975-06-03 | Coors Container Co | Method of making a press tab container end from a metallic shell |
| US3888199A (en) * | 1973-12-03 | 1975-06-10 | Coors Container Co | Method of making a press tab container end from a metallic web |
| JPS5126179A (en) * | 1974-08-23 | 1976-03-03 | Toyo Seikan Kaisha Ltd | Kanfutano kaikoseikeioyobi gaikaikonaimennikonpaundootochakusuru hoho oyobisono sochi |
| US3981652A (en) * | 1974-08-05 | 1976-09-21 | Usm Corporation | Machine for partly coating articles |
| JPS5131576A (en) * | 1974-09-10 | 1976-03-17 | Toyo Seikan Kaisha Ltd | KANIKAIFUKANYOGAITAI NO SEIZOHOHO |
| US3935961A (en) * | 1974-09-30 | 1976-02-03 | Bennett Robert A | Unitary beverage container |
| US4024980A (en) * | 1974-11-08 | 1977-05-24 | Crown Cork & Seal Company, Inc. | Easy opening can end having a closure plug |
| US3980200A (en) * | 1975-04-28 | 1976-09-14 | Klein Gerald B | Sealant for pushdown gate in a can lid |
| US3958717A (en) * | 1975-08-15 | 1976-05-25 | Jos. Schlitz Brewing Company | Lid construction for a container |
| DE2707064A1 (en) * | 1977-02-18 | 1978-11-16 | American Can Co | Forming opening tab in sheet metal container end closures - using bulge whose height is reduced and reformed into opening tab |
| DK154269C (en) * | 1977-02-24 | 1989-05-16 | American National Can Co | PROCEDURE FOR MANUFACTURING A LABEL FOR CLOSING AN OPENING IN A METAL END CLOSE. |
| US4054228A (en) * | 1977-04-01 | 1977-10-18 | American Can Company | Can end closure having first and second sealing means |
| ZA793899B (en) * | 1978-08-04 | 1980-07-30 | M Joyce | Container with releasable closure |
| AU532786B2 (en) * | 1979-08-13 | 1983-10-13 | Broken Hill Proprietary Company Limited, The | Push - in closure |
| DE2950214C2 (en) * | 1979-12-13 | 1986-02-06 | Schmalbach-Lubeca AG, 3300 Braunschweig | Process for the continuous manufacture of sheet metal lids for cans |
| US4319692A (en) * | 1980-06-23 | 1982-03-16 | Gundlach Roy L | Litter free protective beverage can lid |
| US4723684A (en) * | 1983-06-02 | 1988-02-09 | Lambert G Steven | Can lid with integral push-in tab |
| DE3639428C1 (en) * | 1986-11-18 | 1987-08-27 | Rasselstein Ag | Process for producing a can lid made of sheet metal provided with a push-in opening flap |
| DE3716382A1 (en) * | 1987-05-15 | 1988-11-24 | Schmalbach Lubeca | SHEET LID FOR CAN |
| GB8903629D0 (en) * | 1989-02-17 | 1989-04-05 | Metal Box Plc | Metal/polymer laminates |
| DE3941432C2 (en) * | 1989-12-15 | 1994-01-20 | Rasselstein Ag | Tin lid made of sheet metal, especially for cans, the contents of which are under internal pressure |
| AUPM419494A0 (en) * | 1994-03-02 | 1994-03-24 | Broken Hill Proprietary Company Limited, The | Improved full-open end |
| US6131763A (en) * | 1999-07-19 | 2000-10-17 | Stanish; Walt | Beverage container and dispenser apparatus |
| US8245866B2 (en) | 2005-08-25 | 2012-08-21 | Daniel Robert Gibson | Container |
| WO2018048824A1 (en) * | 2016-09-06 | 2018-03-15 | Stolle Machinery Company, Llc | Container closure with shifted material line and tooling and associated method for making a closure |
| DE102020128491A1 (en) | 2020-10-29 | 2022-05-05 | Top Cap Holding Gmbh | Can end and method of making a can end |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2176898A (en) * | 1938-09-06 | 1939-10-24 | Us Can Corp | Container |
| US2261117A (en) * | 1939-06-09 | 1941-11-04 | Us Can Corp | Closure member and method of preparing same |
| US2652169A (en) * | 1948-02-24 | 1953-09-15 | Paul E Brusienski | Hand pressure released container opening |
| US2789718A (en) * | 1953-09-28 | 1957-04-23 | Baxter Laboratories Inc | One-piece tear-cap or closure |
| US2787394A (en) * | 1954-01-21 | 1957-04-02 | Baxter Laboratories Inc | Closure |
| US2842295A (en) * | 1956-01-24 | 1958-07-08 | Bajada Anthony | Lid closure for can containers |
| US3195763A (en) * | 1960-11-10 | 1965-07-20 | Fried Louis | Receptacle and opening means therefor |
| US3266452A (en) * | 1962-12-07 | 1966-08-16 | American Can Co | Sift-proof dredge closure and method of producing same |
| US3246791A (en) * | 1963-08-12 | 1966-04-19 | Charles T Asbury | Can-opening arrangement |
| US3261497A (en) * | 1964-03-02 | 1966-07-19 | Nat Can Corp | Can |
| US3236409A (en) * | 1964-07-06 | 1966-02-22 | United States Steel Corp | Push-in can-end closure with holding means |
| US3362569A (en) * | 1964-08-24 | 1968-01-09 | Joseph A. Geiger | Container closures with breakable openings |
| US3227304A (en) * | 1964-09-08 | 1966-01-04 | Charles T Ashury | Can opening arrangement |
| US3341057A (en) * | 1964-12-01 | 1967-09-12 | Continental Can Co | Easy opening container end |
| US3355058A (en) * | 1965-12-06 | 1967-11-28 | Charles T Asbury | Push-in can lid |
| US3410436A (en) * | 1966-09-23 | 1968-11-12 | Anchor Hocking Glass Corp | Closure cap with venting means |
| US3445027A (en) * | 1968-01-18 | 1969-05-20 | Jones & Laughlin Steel Corp | Easy opening containers |
| US3575122A (en) * | 1968-07-03 | 1971-04-13 | Stanray Corp | Methods of constructing a hatch frame and cover therefor |
| US3552341A (en) * | 1968-08-01 | 1971-01-05 | Stanray Corp | Method for forming a roof hatch assembly |
-
1971
- 1971-09-15 US US00180785A patent/US3759206A/en not_active Expired - Lifetime
- 1971-09-15 BR BR6052/71A patent/BR7106052D0/en unknown
- 1971-09-15 CA CA122,906A patent/CA1060815A/en not_active Expired
- 1971-09-15 GB GB4303171A patent/GB1361784A/en not_active Expired
- 1971-09-15 ZA ZA716200A patent/ZA716200B/en unknown
- 1971-09-16 JP JP7126871A patent/JPS5618456B1/ja active Pending
- 1971-09-16 DE DE712146452A patent/DE2146452C3/en not_active Expired
- 1971-09-16 FR FR7133372A patent/FR2106562B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ZA716200B (en) | 1972-05-31 |
| BR7106052D0 (en) | 1973-04-26 |
| GB1361784A (en) | 1974-07-30 |
| FR2106562A1 (en) | 1972-05-05 |
| US3759206A (en) | 1973-09-18 |
| JPS5618456B1 (en) | 1981-04-28 |
| DE2146452A1 (en) | 1972-03-23 |
| FR2106562B1 (en) | 1976-07-09 |
| DE2146452B2 (en) | 1977-01-27 |
| DE2146452C3 (en) | 1979-03-08 |
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