EP2155578A1 - Container in the form of a sheet-metal can with sheet-metal lid - Google Patents

Container in the form of a sheet-metal can with sheet-metal lid

Info

Publication number
EP2155578A1
EP2155578A1 EP08767196A EP08767196A EP2155578A1 EP 2155578 A1 EP2155578 A1 EP 2155578A1 EP 08767196 A EP08767196 A EP 08767196A EP 08767196 A EP08767196 A EP 08767196A EP 2155578 A1 EP2155578 A1 EP 2155578A1
Authority
EP
European Patent Office
Prior art keywords
container
lid
locking ring
edge portion
point
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.)
Granted
Application number
EP08767196A
Other languages
German (de)
French (fr)
Other versions
EP2155578A4 (en
EP2155578B1 (en
Inventor
Richard Johansson
Thomas Hjalmarsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMBALLATOR ULRICEHAMNS BLECK AB
Original Assignee
EMBALLATOR ULRICEHAMNS BLECK AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by EMBALLATOR ULRICEHAMNS BLECK AB filed Critical EMBALLATOR ULRICEHAMNS BLECK AB
Priority to PL08767196T priority Critical patent/PL2155578T3/en
Publication of EP2155578A1 publication Critical patent/EP2155578A1/en
Publication of EP2155578A4 publication Critical patent/EP2155578A4/en
Application granted granted Critical
Publication of EP2155578B1 publication Critical patent/EP2155578B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B65D45/00—Clamping or other pressure-applying devices for securing or retaining closure members
    • B65D45/02—Clamping or other pressure-applying devices for securing or retaining closure members for applying axial pressure to engage closure with sealing surface
    • B65D45/30—Annular members, e.g. with snap-over action or screw-threaded
    • 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
    • B65D43/00—Lids or covers for rigid or semi-rigid containers
    • B65D43/02—Removable lids or covers
    • B65D43/0202—Removable lids or covers without integral tamper element
    • B65D43/0204—Removable lids or covers without integral tamper element secured by snapping over beads or projections
    • B65D43/021—Removable lids or covers without integral tamper element secured by snapping over beads or projections only on the inside, or a part turned to the inside, of the mouth
    • 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
    • B65D45/00—Clamping or other pressure-applying devices for securing or retaining closure members
    • B65D45/32—Clamping or other pressure-applying devices for securing or retaining closure members for applying radial or radial and axial pressure, e.g. contractible bands encircling closure member
    • 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
    • B65D55/00—Accessories for container closures not otherwise provided for
    • B65D55/02—Locking devices; Means for discouraging or indicating unauthorised opening or removal of closure
    • B65D55/06—Deformable or tearable wires, strings, or strips; Use of seals, e.g. destructible locking pins
    • B65D55/08—Annular elements encircling container necks
    • B65D55/0863—Plastic snap-on cap-like collars having frangible parts
    • 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
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00018—Overall construction of the lid
    • B65D2543/00064—Shape of the outer periphery
    • B65D2543/00074—Shape of the outer periphery curved
    • B65D2543/00092—Shape of the outer periphery curved circular
    • 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
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00018—Overall construction of the lid
    • B65D2543/00259—Materials used
    • B65D2543/00277—Metal
    • 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
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444—Contact between the container and the lid
    • B65D2543/00481—Contact between the container and the lid on the inside or the outside of the container
    • B65D2543/0049—Contact between the container and the lid on the inside or the outside of the container on the inside, or a part turned to the inside of the mouth of the container
    • B65D2543/00509—Cup
    • 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
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444—Contact between the container and the lid
    • B65D2543/00481—Contact between the container and the lid on the inside or the outside of the container
    • B65D2543/00537—Contact between the container and the lid on the inside or the outside of the container on the outside, or a part turned to the outside of the mouth of the container
    • B65D2543/00546—NO contact
    • 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
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444—Contact between the container and the lid
    • B65D2543/00592—Snapping means
    • B65D2543/00601—Snapping means on the container
    • B65D2543/00611—Profiles
    • B65D2543/0062—Groove or hollow bead
    • 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
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444—Contact between the container and the lid
    • B65D2543/00592—Snapping means
    • B65D2543/00601—Snapping means on the container
    • B65D2543/00675—Periphery concerned
    • B65D2543/00685—Totality
    • 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
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444—Contact between the container and the lid
    • B65D2543/00592—Snapping means
    • B65D2543/00712—Snapping means on the lid
    • B65D2543/00722—Profiles
    • B65D2543/00731—Groove or hollow bead
    • 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
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444—Contact between the container and the lid
    • B65D2543/00592—Snapping means
    • B65D2543/00712—Snapping means on the lid
    • B65D2543/00787—Periphery concerned
    • B65D2543/00796—Totality
    • 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
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00953—Sealing means
    • B65D2543/00962—Sealing means inserted
    • B65D2543/00972—Collars or rings

Definitions

  • Container in the form of a sheet-metal can with sheet-metal lid.
  • the present invention relates to a container in the form of a sheet-metal can with sheet-metal lid according to the preamble to the following patent claim 1.
  • the object of the present invention is to produce a solution in which a container in the form of a sheet-metal can with sheet-metal lid and locking ring can be closed and opened quickly and with simple means.
  • fig. 1 shows a side view of a container according to the invention
  • fig. 2 shows on a larger scale a partially broken portion of the sheet- metal can with lid
  • fig. 3 shows a perspective view of the container directly after the locking ring has been broken open with a breaking tool
  • fig. 4 shows in schematic representation flow directions in the injection molding of a locking ring forming part of the container.
  • the container 1 is primarily intended for the storage and transport of hazardous goods, in which high demands are placed upon the packaging so that this is not accidentally opened if exposed to abnormal forces.
  • the container consists of a sheet-metal can 2 with sheet-metal lid 3, as can be seen from fig. 1.
  • the container 1 i.e. both can and lid, are therefore made of a relatively thin-walled plate, usually tin plate, which is of uniform thickness and is produced from a flat or rolled sheet billet, for example steel plate, with tin-plated surface on at least one side and possibly painted on at least the outer side.
  • the plate can also be painted on the inner side for increased corrosion protection.
  • the plate thickness is, for example, 0.1-1.0 mm, usually 0.1-0.5 mm.
  • relatively small material thickness is chosen, yet in the forming operation, especially in edge portions, a relatively good dimensional stability is acquired.
  • the can 2 has at the bottom a base 4, which usually is flat and is connected to a circumferential casing wall 5 which extends upward from the base and which usually is slightly conical or possibly cylindrical.
  • the connection to the base is made, for example, in a conventional manner by means of seaming and soldering, so that a leak-tight connection is obtained.
  • the casing wall 5 is closed by means of a plate joint.
  • a handle 7 is fixed in the casing wall 5 of the can 2.
  • the casing wall passes at the top into a circumferential, circular opening edge portion 6, which encloses a can opening which is normally closed by means of the lid 3.
  • This likewise has a circumferential edge portion 8, which is intended to be sealingly connected to the opening edge 10 of the can and to secure the lid in the closed state.
  • the opening edge portion 6 of the can can best be seen from fig. 2 and is formed by an extended portion of the casing wall 5.
  • the opening edge portion 6 of the can is formed by the casing wall 5 being bent outward at the top to form a rounded crest 9, for example in the shape of an arc, and passes from there into an outer edge portion 11 angled radially outward down away from the crest, which outer edge portion, in the illustrated example, is straight in cross section and, in its entirety, forms the shape of a truncated conical surface, i.e. is substantially conical.
  • This conical portion 11 passes at the bottom into an annular shoulder edge 12 and extends toward and rests against the shell surface of the can 13 below the opening edge portion and is rolled over to form a concealed edge closure 14 for reinforcement of the structure as a whole.
  • the lid 3 which is shown clearly in the section in fig. 2, will now be described in greater detail.
  • the lid has a circumferential edge portion 15, which on the outside has an edge flange 16 which, with an intermediate sealing ring 17, bears sealingly against the crest of the can.
  • the edge flange 16 of the lid passes into a substantially cylindrical portion 19 connecting to the inner side
  • the edge portion of the lid forms a U-shaped groove 22 in order to lose as little volume as possible in the container, i.e. in order that the covering part 23 of the lid shall be situated as high up as possible in relation to the opening edge portion of the can.
  • the container 1 according to the invention is therefore provided with a locking ring 24, which encloses the opening edge portion 6 of the can and the circumferential edge portion 15 of the lid.
  • the locking ring is made of an elastic plastics material, but nevertheless with good dimensional stability and strength, such as injection-molded thermoplastic.
  • the locking ring 24 is constituted by a fully closed, in the example circular unit, which is designed to in the locking position, as is shown in fig. 1 , securely hold the lid 3 in a seal-tight manner on the can 2 by mechanical fastening to the circumferential edges of the can and of the lid.
  • the locking ring 24 is constructed as an annular closed profile having a substantially U-shaped portion 25, which forms a downwardly open annular channel 26 in which the circumferential edges of the lid and of the can are enclosed.
  • the U-shaped portion 25 passes into an annular skirt 27, which extends all the way round the can and which on its inner side 28 has a locking bead 29 that, through interaction with the downwardly and outwardly directed shoulder edge 12 or the boss, locks the locking ring 24 and hence the lid 3 on the can 2 in the locking position according to fig. 1 and 2.
  • the U-shaped portion 25 has a flange 30 jutting down on the inner side of the lid, which flange bears tightly against the cylindrical portion 19 of the lid and passes at the top into an upper portion 31 which bears against the edge flange 16 of the lid and advantageously has a raised edge bead 32, which facilitates stacking of a plurality of containers.
  • an outer flange 33 of the U-shaped portion 25 juts down and covers over the joint between the lid and the can.
  • the skirt 27 extends around the can at a regular distance from its casing wall 5.
  • the locking ring 24 has a weakening point 34, which is designed to be broken open under breaking forces which are sufficiently large to open the container to gain access to its content in its interior space, but never under forces of the kind which the container must withstand when the can with its content is otherwise handled, i.e. when the container is in the closed locking state shown in fig. 1 and 2, according to the prevailing standard.
  • the sort of demands, inter alia stresses, with which a container for, for example, hazardous goods must be able to cope is defined in standards and is published, inter alia, in so-called UN certificates following conducted tests.
  • the weakening point 34 is indicated schematically in fig. 1 , but is normally or substantially not visible to the eye.
  • the weakening point 34 therefore extends over the locking ring 24, transversely over or obliquely over or along a non- straight line. It is not in all embodiments entirely necessary for the weakening to extend all the way from the lower outer edge 35 of the locking ring to its lower inner edge 36, but rather it is up to technology to create the weakening and its strength, i.e. that the strength in the weakening can be regulated with the length of the weakening line.
  • a point of engagement 37 for a breaking tool 38 for example a screwdriver, is provided, see fig. 3.
  • the point of engagement 37 is realized as a laterally directed protrusion from the skirt 27 of the locking ring 24 and, in the example, is realized as a bow 39 or bridge, which is open in the upward and downward direction, alternatively as a downwardly open pocket, which is integrated on the outer side of the locking ring 24 close to its lower outer edge 35, on the outer side of the skirt 27, so that a small space 40 is formed for insertion of the blade 41 of the tool, which can rest above the bow against the outer side of the outer flange 33.
  • the point of engagement is situated beside and in the region of the weakening point, such that, by a rocking motion outward and upward, see the direction of the arrow 42, of the tool 38, sufficiently large breaking forces are generated that the locking ring snaps and is opened at the weakening point 34, whereby the locking ring can be pulled off and the lid can be conventionally removed, for example with a suitable tool which can be inserted between the lid and the can. Possibly there is a flattening of the edge provided somewhere, which allows a tool to be inserted into an active position for lifting of the lid.
  • the protrusion is situated such that it does not project below the lower edge of the skirt and is hence less conspicuous.
  • the weakening point 34 is formed by the fact that the locking ring 24 is produced by injection molding in a substantially closed mold having an annular cavity with a single delivery point, a sprue, for liquid thermoplastic, which is therefore heated to liquid form.
  • a substantially closed mold having an annular cavity with a single delivery point, a sprue, for liquid thermoplastic, which is therefore heated to liquid form.
  • the annular mold will be filled with two simultaneous flows of liquid thermoplastic, see the arrows 44, 45, which flow at mutually identical speed and finally form two substantially semicircular ring halves, in which the two fronts of the thermoplastic mass meet at the position for the intended weakening point and converge there.
  • the weakening point 34 is therefore not visible in practice, but is shown in fig. 1 and 4 for easier comprehension.
  • the surface of the mass has a somewhat lower temperature than the interior of the mass, a fully homogenous fusion having the same strength as the rest of the thermoplastic does not occur, thereby giving rise to a weakened spot which constitutes the weakening point once the thermoplastic mass has solidified with lowering of the temperature and a necessary time delay for full solidification.
  • the mold is configured with a small channel to form the bow-shaped point of engagement.
  • the can and the lid can have a different shape, for example an oval shape or a shape having a plurality of, for example, four corners, which are rounded.
  • the fitting of the locking ring can be realized in various steps and can be enabled by the interacting conical surfaces 11 of the can 2 and the surface below the locking bead 29.
  • the locking ring can also be injection molded on the spot. This is of interest, inter alia, when the locking ring is wholly integrated with the lid and is injection molded against the opening edge portion of the lid, i.e.
  • Two or more weakening points and two or more points of engagement for the breaking tool are conceivable, though it is not self- evident that the number of weakening points and points of engagement are equal.
  • Two or more weakening points are formed, for example, if two or more delivery points are arranged symmetrically in the mold, in which case a corresponding number of plastic flows are formed which meet at half way and together form two or more weakening points.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)

Abstract

A container in the form of a sheet-metal can with removable sheet-metal lid for the closure and exposure of a storage space for a goods item. The lid is secured against accidental opening by means of an elastic plastics locking ring (24), which is constructed as an annularly closed profile having a substantially U-shaped portion forming a downwardly open annular channel that encloses the circumferential edge portion of the lid and the opening edge portion of the can and secures the lid and with an annular bead (29) engages below a radially projecting portion (12) of the opening edge portion (6) of the can. The locking ring (24) has a weakening point (34), which can be broken open for opening of the container when the weakening point (34) is exposed to breaking forces exceeding a fixed maximum load in the handling of the container, and the locking ring has a point of engagement (37), situated in the proximity of the weakening point, for a breaking tool (38) so as to be able with a rocking motion to break open the locking ring at the weakening point, which normally is not visible to the eye. The point of engagement (37) for a breaking tool (38) is constituted by a protrusion of the locking ring (24), situated on the outer side of the ring below the engagement bead of the ring. The protrusion extends close to the lower edge of the skirt and has an opening which is open at least in the downward direction.

Description

TITLE
Container in the form of a sheet-metal can with sheet-metal lid.
TECHNICAL FIELD The present invention relates to a container in the form of a sheet-metal can with sheet-metal lid according to the preamble to the following patent claim 1.
BACKGROUND ART
For the storage and transport of hazardous goods there are various container solutions, for example having some form of locking ring which holds together the lid and the can even in the event of excess pressure and mechanical action. However, no good solutions have been found for easily closing such containers and easily removing the locking ring for intentional opening of the can.
DISCLOSURE OF INVENTION
The object of the present invention is to produce a solution in which a container in the form of a sheet-metal can with sheet-metal lid and locking ring can be closed and opened quickly and with simple means.
Said object is achieved by means of the container according to the invention, the characteristics of which emerge from the following patent claim 1.
BRIEF DESCRIPTION OF DRAWINGS The invention will be described in greater detail below with an illustrative embodiment with reference to the appended drawings, in which:
fig. 1 shows a side view of a container according to the invention,
fig. 2 shows on a larger scale a partially broken portion of the sheet- metal can with lid, fig. 3 shows a perspective view of the container directly after the locking ring has been broken open with a breaking tool, and
fig. 4 shows in schematic representation flow directions in the injection molding of a locking ring forming part of the container.
MODE(S) FOR CARRYING OUT THE INVENTION
The container 1 according to the invention is primarily intended for the storage and transport of hazardous goods, in which high demands are placed upon the packaging so that this is not accidentally opened if exposed to abnormal forces. The container consists of a sheet-metal can 2 with sheet-metal lid 3, as can be seen from fig. 1. The container 1 , i.e. both can and lid, are therefore made of a relatively thin-walled plate, usually tin plate, which is of uniform thickness and is produced from a flat or rolled sheet billet, for example steel plate, with tin-plated surface on at least one side and possibly painted on at least the outer side. The plate can also be painted on the inner side for increased corrosion protection. The plate thickness is, for example, 0.1-1.0 mm, usually 0.1-0.5 mm. In order to reduce material consumption, and hence costs and weight, for paints, for example, relatively small material thickness is chosen, yet in the forming operation, especially in edge portions, a relatively good dimensional stability is acquired.
The can 2 has at the bottom a base 4, which usually is flat and is connected to a circumferential casing wall 5 which extends upward from the base and which usually is slightly conical or possibly cylindrical. The connection to the base is made, for example, in a conventional manner by means of seaming and soldering, so that a leak-tight connection is obtained. The casing wall 5 is closed by means of a plate joint. In the example, a handle 7 is fixed in the casing wall 5 of the can 2.
As can be seen from the section in fig. 2, the casing wall passes at the top into a circumferential, circular opening edge portion 6, which encloses a can opening which is normally closed by means of the lid 3. This likewise has a circumferential edge portion 8, which is intended to be sealingly connected to the opening edge 10 of the can and to secure the lid in the closed state.
The opening edge portion 6 of the can can best be seen from fig. 2 and is formed by an extended portion of the casing wall 5. This means that the same panel which is cut to size to form the casing wall 5 has, apart from the straight-sectioned portion forming the casing wall, an extension portion which forms, firstly, the opening edge portion itself and, secondly, a further portion having a function to be described in greater detail below.
The opening edge portion 6 of the can is formed by the casing wall 5 being bent outward at the top to form a rounded crest 9, for example in the shape of an arc, and passes from there into an outer edge portion 11 angled radially outward down away from the crest, which outer edge portion, in the illustrated example, is straight in cross section and, in its entirety, forms the shape of a truncated conical surface, i.e. is substantially conical.
This conical portion 11 passes at the bottom into an annular shoulder edge 12 and extends toward and rests against the shell surface of the can 13 below the opening edge portion and is rolled over to form a concealed edge closure 14 for reinforcement of the structure as a whole.
The lid 3, which is shown clearly in the section in fig. 2, will now be described in greater detail. The lid has a circumferential edge portion 15, which on the outside has an edge flange 16 which, with an intermediate sealing ring 17, bears sealingly against the crest of the can. The edge flange 16 of the lid passes into a substantially cylindrical portion 19 connecting to the inner side
18 of the casing wall of the can, in the example provided with a bead 20, which is in positive-locking engagement with a corresponding bead 21 in the shell surface of the can, whereby the lid is held in the closed state. With the cylindrical portion, the edge portion of the lid forms a U-shaped groove 22 in order to lose as little volume as possible in the container, i.e. in order that the covering part 23 of the lid shall be situated as high up as possible in relation to the opening edge portion of the can.
For secure closing and securement of the lid 3 on the can 2, the container 1 according to the invention is therefore provided with a locking ring 24, which encloses the opening edge portion 6 of the can and the circumferential edge portion 15 of the lid. The locking ring is made of an elastic plastics material, but nevertheless with good dimensional stability and strength, such as injection-molded thermoplastic. The locking ring 24 is constituted by a fully closed, in the example circular unit, which is designed to in the locking position, as is shown in fig. 1 , securely hold the lid 3 in a seal-tight manner on the can 2 by mechanical fastening to the circumferential edges of the can and of the lid.
As can be seen from the figures, the locking ring 24 is constructed as an annular closed profile having a substantially U-shaped portion 25, which forms a downwardly open annular channel 26 in which the circumferential edges of the lid and of the can are enclosed. On the outer side of the container 1 , the U-shaped portion 25 passes into an annular skirt 27, which extends all the way round the can and which on its inner side 28 has a locking bead 29 that, through interaction with the downwardly and outwardly directed shoulder edge 12 or the boss, locks the locking ring 24 and hence the lid 3 on the can 2 in the locking position according to fig. 1 and 2. More precisely, the U-shaped portion 25 has a flange 30 jutting down on the inner side of the lid, which flange bears tightly against the cylindrical portion 19 of the lid and passes at the top into an upper portion 31 which bears against the edge flange 16 of the lid and advantageously has a raised edge bead 32, which facilitates stacking of a plurality of containers. On the outer side of the container, an outer flange 33 of the U-shaped portion 25 juts down and covers over the joint between the lid and the can. The skirt 27 extends around the can at a regular distance from its casing wall 5. According to the invention, the locking ring 24 has a weakening point 34, which is designed to be broken open under breaking forces which are sufficiently large to open the container to gain access to its content in its interior space, but never under forces of the kind which the container must withstand when the can with its content is otherwise handled, i.e. when the container is in the closed locking state shown in fig. 1 and 2, according to the prevailing standard. The sort of demands, inter alia stresses, with which a container for, for example, hazardous goods must be able to cope is defined in standards and is published, inter alia, in so-called UN certificates following conducted tests.
The weakening point 34 is indicated schematically in fig. 1 , but is normally or substantially not visible to the eye. The weakening point 34 therefore extends over the locking ring 24, transversely over or obliquely over or along a non- straight line. It is not in all embodiments entirely necessary for the weakening to extend all the way from the lower outer edge 35 of the locking ring to its lower inner edge 36, but rather it is up to technology to create the weakening and its strength, i.e. that the strength in the weakening can be regulated with the length of the weakening line.
In order to be able to create the necessary breaking forces to break open the locking ring 24 at the weakening point 34, according to the invention a point of engagement 37 for a breaking tool 38, for example a screwdriver, is provided, see fig. 3. The point of engagement 37 is realized as a laterally directed protrusion from the skirt 27 of the locking ring 24 and, in the example, is realized as a bow 39 or bridge, which is open in the upward and downward direction, alternatively as a downwardly open pocket, which is integrated on the outer side of the locking ring 24 close to its lower outer edge 35, on the outer side of the skirt 27, so that a small space 40 is formed for insertion of the blade 41 of the tool, which can rest above the bow against the outer side of the outer flange 33. The point of engagement is situated beside and in the region of the weakening point, such that, by a rocking motion outward and upward, see the direction of the arrow 42, of the tool 38, sufficiently large breaking forces are generated that the locking ring snaps and is opened at the weakening point 34, whereby the locking ring can be pulled off and the lid can be conventionally removed, for example with a suitable tool which can be inserted between the lid and the can. Possibly there is a flattening of the edge provided somewhere, which allows a tool to be inserted into an active position for lifting of the lid. The protrusion is situated such that it does not project below the lower edge of the skirt and is hence less conspicuous.
According to an advantageous embodiment, the weakening point 34 is formed by the fact that the locking ring 24 is produced by injection molding in a substantially closed mold having an annular cavity with a single delivery point, a sprue, for liquid thermoplastic, which is therefore heated to liquid form. As illustrated schematically in fig. 4, by choosing the sprue, see the arrow 43, diametrically opposite the position for the intended weakening point 34, air being simultaneously evacuated at the weakening point, the annular mold will be filled with two simultaneous flows of liquid thermoplastic, see the arrows 44, 45, which flow at mutually identical speed and finally form two substantially semicircular ring halves, in which the two fronts of the thermoplastic mass meet at the position for the intended weakening point and converge there. The weakening point 34 is therefore not visible in practice, but is shown in fig. 1 and 4 for easier comprehension. By virtue of the fact that the surface of the mass has a somewhat lower temperature than the interior of the mass, a fully homogenous fusion having the same strength as the rest of the thermoplastic does not occur, thereby giving rise to a weakened spot which constitutes the weakening point once the thermoplastic mass has solidified with lowering of the temperature and a necessary time delay for full solidification. The mold is configured with a small channel to form the bow-shaped point of engagement. The fact that the weakening point 34 is inconspicuous and virtually invisible and the protrusion, too, is inconspicuous, and that tools are required to break open the locking ring 24, serves to markedly reduce the risk of, for example, a child or other unauthorized person spontaneously breaking open the container, whereby a high degree of security is achieved.
The invention is not limited to the examples described above and shown in the drawings, but can be varied within the scope of the following patent claims. For example, the can and the lid can have a different shape, for example an oval shape or a shape having a plurality of, for example, four corners, which are rounded. The fitting of the locking ring can be realized in various steps and can be enabled by the interacting conical surfaces 11 of the can 2 and the surface below the locking bead 29. The locking ring can also be injection molded on the spot. This is of interest, inter alia, when the locking ring is wholly integrated with the lid and is injection molded against the opening edge portion of the lid, i.e. sits firmly on the lid as long as the locking ring is not broken, since the ring must be easy to remove. In principle, two or more weakening points and two or more points of engagement for the breaking tool are conceivable, though it is not self- evident that the number of weakening points and points of engagement are equal. Two or more weakening points are formed, for example, if two or more delivery points are arranged symmetrically in the mold, in which case a corresponding number of plastic flows are formed which meet at half way and together form two or more weakening points.

Claims

1. A container in the form of a sheet-metal can (2) with removable sheet- metal lid (3) for the closure and exposure of a storage space for a goods item, wherein the container is rotationally symmetric about an axis of symmetry (1) and has at the bottom a base (4) and a thereto connected casing wall (5), which at the top has a circumferential opening edge portion (6) delimiting a container opening (7) which, when the lid is fitted, is closed by interaction between the circumferential edge portion (15) of the lid and the opening edge portion of the can, wherein the lid is secured against accidental opening by means of an elastic plastics locking ring (24), which is constructed as an annularly closed profile having a substantially U-shaped portion (25) forming a downwardly open annular channel (26) that encloses the circumferential edge portion of the lid and the opening edge portion of the can and secures the lid and with an annular bead (29) engages below a radially projecting portion (12) of the opening edge portion (6) of the can, wherein the opening edge portion is formed by an extended portion of the casing wall (5), which portion is bent over to form the radially projecting portion, wherein the locking ring (24) has at least one weakening point (34) designed to be broken open for opening of the container when the weakening point (34) is exposed to breaking forces exceeding a fixed maximum load in the handling of the container, and the locking ring has a point of engagement (37), situated in the proximity of the weakening point, for a breaking tool (38) so as to be able with a rocking motion to break open the locking ring at the weakening point, characterized in that the weakening point (34) is substantially invisible to the eye and the point of engagement (37) for a breaking tool (38) is constituted by a laterally directed protrusion of the locking ring (24), situated on the outer side of the ring below the engagement bead (29) of the ring, and in that the protrusion extends close to the lower edge of the skirt (27) and has an opening which is open at least in the downward direction.
2. The container as claimed in patent claim 1 , characterized in that the weakening point (34) is formed by production of the locking ring (24) by means of injection molding in an annularly closed mold having a delivery point for each weakening point.
3. The container as claimed in patent claim 1 , characterized in that the locking ring (24) is a separate element which, in the locking state, is positively locked to the circumferential portion (6) of the lid by virtue of its profile having an embracing upper edge portion (25).
4. The container as claimed in patent claim 1 , characterized in that an interspace is arranged between the inner side of the locking ring and the projecting portion of the opening edge portion (15) in order to allow the locking ring to be pressed in during a breaking motion.
5. The container as claimed in patent claim 1 , characterized in that the protrusion is realized as a bow portion (39) which is open in both upward and downward.
6. The container as claimed in patent claim 1 , characterized in that the protrusion is solely laterally directed and does not jut down below the lower edge (35) of the skirt.
EP08767196A 2007-06-20 2008-06-18 Container in the form of a sheet-metal can with sheet-metal lid Not-in-force EP2155578B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08767196T PL2155578T3 (en) 2007-06-20 2008-06-18 Container in the form of a sheet-metal can with sheet-metal lid

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0701528A SE531312C2 (en) 2007-06-20 2007-06-20 Container in the form of tin can with plate lid
PCT/SE2008/050730 WO2008156420A1 (en) 2007-06-20 2008-06-18 Container in the form of a sheet-metal can with sheet-metal lid

Publications (3)

Publication Number Publication Date
EP2155578A1 true EP2155578A1 (en) 2010-02-24
EP2155578A4 EP2155578A4 (en) 2011-10-05
EP2155578B1 EP2155578B1 (en) 2012-09-26

Family

ID=40156459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08767196A Not-in-force EP2155578B1 (en) 2007-06-20 2008-06-18 Container in the form of a sheet-metal can with sheet-metal lid

Country Status (7)

Country Link
EP (1) EP2155578B1 (en)
CN (1) CN101715415B (en)
HK (1) HK1143788A1 (en)
PL (1) PL2155578T3 (en)
RU (1) RU2465184C2 (en)
SE (1) SE531312C2 (en)
WO (1) WO2008156420A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US10543964B2 (en) 2014-09-24 2020-01-28 Baltic Packaging A/S Container with a lid and a securing ring

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Publication number Priority date Publication date Assignee Title
SE538415C2 (en) 2011-09-20 2016-06-21 Emballator Ulricehamns Bleck Ab Container with lid
CN103086060A (en) * 2013-01-07 2013-05-08 四川大学 Container cover preventing soup bases from shaking overflowing

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US3792893A (en) * 1972-03-27 1974-02-19 Atlanta Grotnes Machine Co Removable container cover and retainer
US4165018A (en) * 1978-08-31 1979-08-21 The Continental Group, Inc. Child resistant overcap for easy opening container
FR2643337B1 (en) * 1989-02-17 1991-05-31 Blagden Ind Plc SECURITY RING
DE4133067A1 (en) * 1991-10-04 1993-04-08 Schmalbach Lubeca CONTAINER MADE OF METAL OR A METAL COMPOSITE FILM
US5261551A (en) * 1992-01-14 1993-11-16 All-Pak, Inc. Paint or similar can with overcap having a central opening
US5193705A (en) * 1992-04-01 1993-03-16 Armstrong Containers, Inc. Transportation ring
CH692387A5 (en) * 1996-07-05 2002-05-31 Hoffmann Ag Geb Security tear=off strip
CN2483330Y (en) * 2001-04-17 2002-03-27 谢忠源 Lid structure of metal barrel
MY138157A (en) * 2002-03-07 2009-04-30 Brasilata Embalagens Metalicas Plastic lid for a can

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Title
No further relevant documents disclosed *
See also references of WO2008156420A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10543964B2 (en) 2014-09-24 2020-01-28 Baltic Packaging A/S Container with a lid and a securing ring

Also Published As

Publication number Publication date
RU2010101669A (en) 2011-07-27
CN101715415B (en) 2012-02-29
SE531312C2 (en) 2009-02-17
EP2155578A4 (en) 2011-10-05
CN101715415A (en) 2010-05-26
RU2465184C2 (en) 2012-10-27
HK1143788A1 (en) 2011-01-14
PL2155578T3 (en) 2013-03-29
EP2155578B1 (en) 2012-09-26
SE0701528L (en) 2008-12-21
WO2008156420A1 (en) 2008-12-24

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