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
  • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
  • B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
  • B65D41/46—Snap-on caps or cap-like covers
  • B65D41/48—Snap-on caps or cap-like covers non-metallic, e.g. made of paper or plastics

Definitions

• the invention relates to a snap closure made of plastic for containers, with a grip tab and with a part serving as a guarantee strip, this part extending along the circumference of the closure and at least one predetermined breaking point being thinner than this part, to tear under the action of forces acting along the circumference.
• Guarantee strips on screw caps are already known, there they are attached to the cap. Because the edges of those closures do not have any interruptions like the grip tab mentioned, guarantee strips can be arranged there relatively easily. They are thin with the actual closure body
• the separation of the guarantee strip from the closure body, which is necessary to indicate the first opening of the container, is brought about by the fact that the latter moves axially upwards due to the rotary movement, pulling the guarantee strip over the external thread of the container. Because this has a larger diameter, the guarantee strip sticks to it during the upward movement and is torn off at least over a larger part of its circumference, the predetermined breaking point also tearing in the circumferential direction.
• the present invention now aims to avoid these disadvantages and to create a correspondingly modified snap lock which can in no case be lifted off without this is noticed afterwards, which is also suitable for automatic filling machines and is ultimately also simple to manufacture, ie has very minimal changes in the injection mold.
• such a closure is characterized by the features of claim 1.
• Fig. 1 is a side view of the closure
• Fig. 2 is a view of the same from below.
• the closure which is made of plastic, has a grip tab 1, which, as can be seen, comprises a base plate 2 which is framed by approximately trapezoidal side walls 3 and is connected to the latter via an end wall 4.
• the design of the side walls 3 is therefore chosen so that the forces with which one presses on the base plate 2 from below for the purpose of lifting off the closure are largely transmitted to the closure body 5 of the closure; as a result, the closure, which is held on the container neck with an inner bead 6, can be lifted off under deformation.
• the central cover part protruding into the container neck then also detaches from the latter.
• the lowermost part 7 of the closure body 5, which extends from one side of the grip flap 1 over the circumference of the closure body 5 to the other side of the grip flap, and which bears completely against it with its upper edge 8, is, as in FIG. 1, the right side, and seen in Fig. 2, much thinner than the closure body. In terms of production technology, as in the previous snap locks, it forms the lowest area and thus a piece with the locking body 5, although a thin, horizontally running separating part line can be visible on the outside, which indicates the upper edge 8, but does not pass through the wall.
• this area 7 is provided with several predetermined breaking points 9, which are distributed somewhat regularly and symmetrically over the circumference.
• predetermined breaking points 9 are formed in this guide, for example Aus She 'through wedge-shaped cut-outs which extend from the inner wall 10 of the region 7 from the opposite outer wall 11 towards.
• the wall becomes so thin and translucent that the target smoke spots can also be clearly recognized from the outside, even though their outer walls are identical to those of the closure body 5, and therefore pass through.
• the predetermined breaking points 9 are shown with full lines in FIG. 1.
• the number of predetermined breaking points 9 is arbitrary, but at least four, more preferably six, are expediently arranged, as already mentioned. This makes it impossible to use a tool to lift the closure from any point on the circumference without damage.
• the guarantee strip 7 extends over most of the circumference of the closure body 5.
• the closure When the closure is placed on the container, there is therefore a great risk that its thin wall will be compressed, which would lead to faults in the automatic filling system .
• the guarantee strip 7 In order to make the guarantee strip 7 somewhat stronger and more resistant, it has a plurality of webs 12 which extend over its entire height and effectively form part of it, albeit with a substantially greater wall thickness. These webs 12 are also distributed symmetrically along the circumference, some of them are located directly next to predetermined breaking points, so that the guarantee strip 7, without impairing its function, receives sufficient rigidity to withstand the forces acting on it without damage.
• the webs 12 are advantageously rectangular in shape and, for reasons of production technology, have the same thickness as the closure body 5, which is an advantage in the production of the injection mold with which these closures are manufactured. So they are also integrally connected to the closure body 5.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Closures For Containers (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4274048

Family Applications (1)

Country Status (3)

Cited By (2)

Citations (4)

• 1986
  • 1986-10-31 CH CH432986A patent/CH671005A5/de not_active IP Right Cessation
• 1987
  • 1987-10-26 EP EP19870906906 patent/EP0290498A1/de not_active Withdrawn
  • 1987-10-26 WO PCT/CH1987/000147 patent/WO1988003116A1/de not_active Application Discontinuation

Patent Citations (4)

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