EP0500849A1

EP0500849A1 - Can with push-on cover

Info

Publication number: EP0500849A1
Application number: EP91915115A
Authority: EP
Inventors: Eckhart Schormair; Jürgen PÖNISCH; Rainer Laaf
Original assignee: Effem GmbH
Current assignee: Mars GmbH
Priority date: 1990-09-11
Filing date: 1991-09-03
Publication date: 1992-09-02
Also published as: HUT67404A; CA2066775A1; PL294366A1; DE4029146A1; DE4038870A1; JPH05502000A; WO1992004247A1; MX9101005A; BR9105883A; AU648337B2; AU8428291A; DE4029146C2; RU2060213C1; PL166884B1; HU9201568D0; US5339977A

Abstract

Une boîte (1) avec un couvercle à enfoncer comprend un corps (2) au moins en une seule pièce et un couvercle (4) qui forme une fermeture étanche avec un élément (6) du corps disposé à l'extrémité du corps (2) du côté fermeture, en laissant libre une fente (26) d'introduction d'un levier (14) entre le corps (2) et le couvercle (4), ce qui permet de soulever par effet de levier le couvercle (4). Le couvercle (4) comprend une lèvre élastique continue (8) d'engagement qui s'engage sous précontrainte de l'intérieur dans une moulure de fermeture (10) de l'élément (6) du corps dont la forme est adaptée à la forme de la lèvre d'engagement.A box (1) with a push-in cover comprises a body (2) at least in one piece and a cover (4) which forms a sealed closure with a body element (6) arranged at the end of the body (2 ) on the closing side, leaving free a slot (26) for introducing a lever (14) between the body (2) and the cover (4), which makes it possible to lift the cover (4) by leverage . The cover (4) comprises a continuous elastic engagement lip (8) which engages under prestressing from the inside in a closure molding (10) of the element (6) of the body whose shape is adapted to the shape of the engagement lip.

Description

Pressure lid can

The invention relates to a pressure lid can with an at least one-piece fuselage body and a lid body which, together with a fuselage element arranged at the end of the fuselage body at the closure side, forms a tight closure in which a lever gap remains between the fuselage body and the lid body for the engagement of a lever. by means of which the lid body can be pried open, and a method for producing a hermetically sealed lid closure for a pressure lid can.

Such a pressure lid can is known, for example, from lacquer cans, the push-in lid of which has a radially protruding edge under which a lever, e.g. a screwdriver can be attached, which opens the lid lock in connection with the upper edge of the fuselage body.

Such a pressure lid can is not suitable for perishable foods that have to be sterilized, since a high internal pressure arises during sterilization, which this closure cannot withstand.

Furthermore, a sterilizable folding lid box is known (EP-OS 0 377 788), the lid of which is fastened to the fuselage body with a double fold closure. In its edge area, the cover has an annular groove-like depression, which serves as a lever gap around one Use a lever, e.g. a spoon, to open the lid. For this purpose, the sheet thickness in the bottom of the annular groove-like depression in the manner of tear-open covers is weakened with a score, so that the cover opens in the manner of tear-open closures when a lever is attached, without a pull tab having to be attached to the cover. The disadvantage of this sterilizable folding lid box is the risk of injury to the sharp tear-open edge of the closure remaining on the fuselage body. Moreover, there are the disadvantages with regard to functional reliability that are already known from the zippers when the lid thickness in the scoring is not weakened with extreme accuracy. Furthermore, the handling safety is impaired to the extent that even minor impacts on the lid, for example when transporting the folded lid cans, can result in a leak in the closure by breaking the scoring. An additional disadvantage is that the lid is destroyed when opened. There is no resealability with the original lid. Finally, the cost of such a closure is high due to the manufacturing precision required.

The invention has for its object to provide a Druck¬ lid box with openable lid closure, which on the one hand has a high level of tightness and on the other hand is easy to open and the closure of which can be manufactured more easily and cost-effectively.

In order to achieve this object, it is provided according to the invention that the lid body has a circumferential, resilient engagement lip which engages in a closing bead of the fuselage element from the inside under pretension. The invention advantageously enables a resilient engagement of the cover body in the closure bead of the fuselage element, so that the closure is held under prestress in the closure bead plane by pressing the engagement lip with spring force into the closure bead. The approach of the lever in the lever gap has the effect that, on the one hand, the engagement lip is pulled radially inwards, while the fuselage element is pressed outwards. As a result, the engagement lip in the region of the lever disengages from the sealing bead, so that when the lever is pivoted further, the cover can be completely levered out. The cross-sectional shape of the sealing bead is adapted to the shape of the engagement lip, thereby ensuring a secure fit of the closure and a high sealing effect.

When the pressure lid can is closed, the engagement lip is first pushed back radially inwards by deforming the circumferential resilient leg of the upper part, in order then to snap into the fuselage bead under prestress. The resilient design of the engagement lip itself also supports the sealing effect in the fuselage. The main advantage of such a closure is that such a pressure lid can can be opened in a simple and non-destructive manner without special tools, particularly with regard to the lid. Because the closure interlocks with high spring tension, an extremely good seal can be achieved. Another major advantage is the resealability of the pressure lid can, which opens up multiple uses. In addition, it is also possible to use the pressure lid can as a reusable packaging. The engagement lip is preferably connected to a resilient leg of the top part of the lid, as seen in cross section, so that when the lever is pressed against the resilient leg, it is possible to push the engagement lip radially inward slightly.

In a preferred embodiment, it is provided that the engagement lip is arranged at the outer end of an essentially horizontal annular flange of the cover body. The essentially horizontal ring flange with an engagement lip enables a high sealing force due to the spring force acting radially outwards against the sealing bead.

The ring flange can protrude from the resilient leg of the lid upper part and thus transmit the force of the resilient leg to the engagement lip and, at the same time, depending on its inclination relative to the body of the body, determine the direction of the spring force on the closure bead.

The sealing bead is preferably embossed to the outside. The engagement lip can snap elastically into such a sealing bead after a radial contraction when the cover body is pressed on.

An inwardly embossed lower fuselage bead can be arranged below the closing bead. The lower one Inwardly embossed fuselage allows the cover body to be supported on the side opposite the lever application point when the cover is opened.

In addition, a second inwardly embossed upper fuselage bead can be arranged above the buckle bead, with which the seal of the buckle can be increased.

In a preferred embodiment, a sealing means is provided between the fuselage bead and the engagement lip. The sealant makes it possible to hermetically seal the pressure-lid can, the contents of the can being sterilizable when the pressure-lid can is closed. The lid closure according to the invention is particularly advantageous during sterilization because the internal pressure supports the seal to the extent that the internal pressure acts on the resilient leg and thus increases the contact force of the engagement lip against the sealing bead during the sterilization process. This sealing of the lid closure, which improves even further with internal pressure, advantageously also enables sterilization without counterpressure. In the case of fillings which have been filled in hot, there is a further advantage in cooling due to the contraction of the fuselage, since the reduction in the diameter of the fuselage improves the seal when cooling.

Furthermore, it is preferably provided that the fuselage element is integral with the fuselage body. This has the advantage that the V <=. Closing elements on the fuselage can be produced inexpensively simply by producing the beads in the fuselage body. In another embodiment, it is provided that the fuselage element is connected as a separate part to the end of the fuselage body on the lock side by means of a double-fold lock. Such a fuselage element can be prefabricated together with the lid body and then connected to the fuselage body by a filling company in a conventional manner, namely by means of a double rebate closure. This is particularly advantageous for one-piece fuselages. A further advantage of a separate fuselage element is that the lower fuselage bead embossed inwards can protrude further radially inwards, so that the lid is better supported on the lower fuselage bead when opened.

The engagement lip is preferably formed by rolling the edge of the cover body. In this way, the engagement lip is manufactured in a simple manner in terms of production technology, with sufficient rigidity of the engagement lip being ensured. The curl can spring again and thus contribute to an improved seal in the fuselage.

A force application bead in the cover body, which runs lower than the upper edge of the body, enables the defined application of a lever at an optimal force application point of the resilient leg.

The force application bead of the cover body preferably runs above the engagement lip in a cover upper part of the cover body. When the lever is placed in the force application bead, the engagement lip is pulled radially inwards, which makes it easy to open the lid lock. In one embodiment it is provided that the gap width is reduced in at least part of the circumference and that a lever engagement area is provided compared to the area reduced in the gap width. The reduction in the gap width in at least part of the circumference enables the lid body to be supported on the upper edge of the pressure lid box when the lid body is opened, thereby preventing the lid from being immersed in the contents.

The respective pivot axis for the engagement lip is preferably located in the periphery of the upper edge of the lid upper part directly next to the lever gap. In this way, the engagement lip is out of engagement with the closure bead even with a slight lever movement.

In a particularly preferred embodiment it is provided that the fuselage element is arranged in an inwardly tipped upper fuselage section. The reduction in diameter in the upper region of the pressure cap can advantageously achieves stackability of the pressure cap cans without loading the lid body with the weight of the cans lying above it. Another advantage is that the cover diameter is reduced, which leads to a material saving that is not inconsiderable in mass production.

Embodiments of the invention are explained in more detail below with reference to the drawings. Show it:

1 shows a first embodiment of the invention, FIG. 2 shows an embodiment of a cover with a deep-drawn cover surface,

Fig. 3 shows an enlarged section in the area of

4, an embodiment with support when opening on the upper lid part, FIG. 5 a top view of a further embodiment example of a lid with eccentric lid embossments, FIG. 6 a top view of a further embodiment example with a partially reduced annular gap between the lid body and body body ,

7 shows a section through the closure area of a further exemplary embodiment, FIG. 8 shows a section through the closure area of an exemplary embodiment with a double rebate closure and separate fuselage element,

9 shows a section through the closure region of a further embodiment of the cover, FIG. 10 shows a plan view of a square cover design, and FIG. 11 shows a stackable embodiment of the pressure cover box.

The pressure cap can 1 consists of a cylindrical fuselage body 2, in the central area of which stiffening beads 3 are provided. The pressure lid can is provided with a bottom 13 via a double fold lock 15, which can have expansion beads. At the upper end of the fuselage body 2, the pressure lid can is closed with a lid body 4, which - seen in cross section - has a resilient leg region 11 in the lid upper part 5, which merges into an essentially horizontal annular flange 9, at the outer end of which an engagement lip 8 is provided. The engagement lip 8 is preferably formed by rolling, the rolled end pointing outwards.

The engagement lip 8 engages in a locking bead 10 of the fuselage body 2, which is embossed radially outward in the embodiment of FIG. 1 and is more pronounced in comparison to the stability beads 3. A particularly pronounced lower fuselage bead 18 can be provided below the locking bead 10, which is embossed radially inwards and on which the cover body 4 can be supported when pivoting.

Above the closure bead 10, an upper radially inwardly embossed fuselage bead 20 can be provided, which can also be deepened by subsequent pressing, that is to say after the cover body 4 has been joined to the fuselage body 2, depending on the pressure resistance required.

In the case of a hermetic sealing of the cover closure, as shown in FIG. 3, a sealing means 22 is provided between the engagement lip 8 and the closure bead 10, the cover body 4 and body body 2 preferably being provided with the sealant 22 still liquid be put together. The increased pressure that can be achieved by subsequently deepening the fuselage bead 20

REPLACEMENT LEAF resistance interacts with the opening behavior. There is the possibility of individually determining different subsequent depressions of the body bead 20 for each filling material to be sterilized, in order to obtain an optimum between pressure resistance and opening behavior for each can diameter, each sheet thickness and / or for each filling material.

In the lever gap 26 remaining between the fuselage body 2 and the upper lid part 5 of the lid body 4, a lever 14 can be attached, which is supported with its free end against the resilient leg 11 of the upper lid part and uses the upper edge 16 of the fuselage body 2 as lever supports. The lever 14 can push the resilient leg 11 radially inwards, while at the same time the fuselage body 2 is pressed slightly outwards. Due to the resilience of the resilient leg 11 of the top cover part, the essentially horizontal ring flange with the engagement lip in the lever engagement region 30 is also pushed back, whereby the cover body 4 initially disengages from the locking bead 10 and then completely with the continued lever movement from the Lock bead jumps out.

Particularly advantageous in the case of a hermetic cover closure with sealing means 22 is the fact that the high internal pressure during sterilization supports the seal insofar as the internal pressure also presses radially outward on the resilient leg region 11 and thus causes an increased pressing of the engagement lip 8 .

Another advantage is that the fuselage body 2 contracts when it cools down, causing the

_REPLACEMENT SHEET Reduction in diameter also has a positive effect on the sealing effect.

Regardless of whether a sealant 22 is used or not, the lid body 4 of the pressure lid box 1 can be reused to close the pressure lid box again.

Fig. 2 shows another embodiment of a lid with a lid body 4 ', the inner region of which is deep-drawn in such a way that the inner surface of the lid surface 7 extends in the plane of the ring flange 9. The lid body 4 ', like the other embodiments of a lid body, can be provided with lid beads 19 in the lid base 7.

1, 2, 7 and 11, the upper edge 16 of the fuselage body 2 is rolled outwards, the curl being able to protrude beyond the fuselage diameter or radially inward by tucking in that the upper edge 16 has the same diameter as the fuselage diameter, or a slightly smaller one.

The embodiment of Fig. 4 shows a Deckel¬ body 4 ^1, as shown in FIG. 2 without cover 19 in beads partially verεchwenktem state when opening the lid. The upper edge 16 of the fuselage body 2 is rolled inwards without having a collision with the engagement lip 8 when opening. The lid body 4 ¹ is designed so that the upper end of the resilient leg 11 when pivoting of the lid body 4 'to the handle portion 30 is supported against the Hebelein¬ in the region of the closure bead 10 ver¬ running pivot axis of the lid body 4 ¹ on the curled inwards upper edge 16 and DA prevented by immersing the lid body in the filling 17th

The design of the cover according to the exemplary embodiments in FIGS. 2 and 4 results in an increased elasticity of the engagement lip 8 in that, in addition to the swivel axis 32 in the peripheral region of the upper cover part 5, a further swivel axis 33 at the beginning of the deep-drawn region through the Deep drawing of the lid body 4 ¹ is formed.

5 shows a plan view of a cover body with an eccentric embossed cover, in which the lever gap 26 has a variable gap width in the circumferential direction of the pressure cover box due to the eccentricity of the upper cover part 5 protruding from the ring flange 9. The reduced gap width enables good support on the top edge of the lid 16 at the point of the smallest gap width, as already shown in principle in FIG. 4, when the lever 14 is applied at the point with the largest gap width.

A vacuum tester 36 can also be embossed in the lid surface. As shown in FIG. 4, the lid base 7 can be deep-drawn.

6 shows a further exemplary embodiment of the cover with a cover body ″ with a cover upper part 5 concentric with the engagement lip 8. Upper part 5 is provided at one point with an expression 28, which reduces the gap width of the lever gap 26 in a part of the circumference. The lever engagement area 30 for the lever 14, as in FIG. 5, is opposite the area with a reduced gap width.

FIG. 7 shows a further exemplary embodiment of the cover closure with a closure bead 10 ′ which is embossed radially inwards. The lid body 4 '*' has an engagement lip 8, into which a radially inwardly shaped engagement bead 8 'is stamped, which is adapted in terms of the cross-sectional shape of the closure bead 10'. Above the engagement bead 8 ¹ , the edge can be rolled inwards as the end of the engagement lip 8.

In the case of a hermetically sealed closure, the engagement bead 8 'is coated with the sealant 22 and then, preferably with the sealant still liquid, pressed in via the closure bead 10' until the lock engages.

In Fig. 8 an embodiment is shown, which can be used mainly in pressure lid cans with a one-piece body 2. Here, a fuselage element 6 is connected to the fuselage body 2 as a separate part by means of a double folding lock 24. This fuselage element 6 has an outwardly embossed closure bead 10 and a particularly pronounced lower fuselage bead 18 which can protrude further radially inwards than the lower fuselage bead 18 embossed into the fuselage body 2 in the other exemplary embodiments in this way the support surface of the lower fuselage bead 18 is enlarged. The separate body member 6 ^• may also include an upper hull bead 20, which can also be after the Zusam¬ menfügen of the lid body 4 and the body member 6 subsequently in a further operation, more rapid pronounced dial inward.

The cover closure can then be delivered to a filling company in the assembled state in the one-piece hull body 2 as a uniform closure element comprising the cover body 4 and the hull element 6 ', which then connects the cover closure in a conventional manner to the one-piece hull body 2 via the double-fold closure 21.

FIG. 9 shows a further exemplary embodiment of a cover body, in which a particularly pronounced force application bead 12 is stamped in the area of the resilient leg 11. This force application bead 12 enables a defined force application point for the lever 14, the lever force not acting directly on the resilient leg 11 but only exerting an upward tensile force on the cover body 4.

10 shows an exemplary embodiment of a pressure lid can with a non-rotationally symmetrical cross-sectional shape. In plan view, the lid body has an essentially quadrangular shape with strongly rounded corners.

FIG. 11 shows a last exemplary embodiment similar to FIG. 1, in which the upper fuselage section 34 is tucked inwards to a smaller outside diameter. The beads required for the lid closure are provided in the recessed fuselage section 34. By The slightly reduced outer diameter of the upper fuselage section advantageously creates the stackability of the pressure lid cans without the stacked cans resting on the lid body 4 by the respective base 13 of a stacked pressure lid box 1 on the respective upper edge 16 of the pressure lid box underneath 1 sits on. Another advantage is that the material consumption for the cover body 4 is reduced due to the reduced diameter.

The cover body 4 can also be made of plastic instead of fine sheet metal, the engagement lip 8 being made of solid material instead of a curl and the material thickness can be greater.

The features of the invention disclosed in the above description, in the drawings and in the claims are intended to be essential both individually and in any combination for realizing the invention in its various embodiments.

Claims

1. Pressure lid can with an at least one-piece body and a lid body, which forms a tight seal together with a body element arranged at the end of the body of the body, in which a lever gap between the body and the lid body remains free for the engagement of a lever, via which the Cover body can be pried open, characterized in that the cover body (, 4 ', 4 *', 4 '' ') has a circumferential, resilient engagement lip (8, 8') which fits into a closure bead (10, 10 ') adapted to the shape of the engagement lip. of the fuselage element (6,6 ') engages under tension from the inside.

2. Pressure lid can according to claim 1, characterized gekenn¬ characterized in that the engagement lip (8,8 ') with a resilient leg (11) of the lid upper part (5) is connected.

3. Pressure lid can according to claim 1 or 2, characterized in that the engagement lip (8) is arranged at the outer end of a substantially horizontal ring flange (9) of the lid body (4,4 ', 4 ^II , 4'' ¹ ).

4. Pressure lid box according to claim 3, characterized gekenn¬ characterized in that the annular flange (9) from the spring leg (11) of the lid upper part (5) protrudes.

5. Pressure lid can according to one of claims l to 4, characterized in that the sealing bead (10) is embossed to the outside.

Pressure lid can according to one of claims 1 to 5,

6. characterized in that the cover body (4.4 ^I, 4 ^'', ^4,) has a circumferential force application bead (12) for a lever (14) which extends above the engagement lip plane.

7. Pressure lid can according to one of claims 1 to 6, characterized in that an inwardly embossed lower fuselage bead (18) is arranged under the closure bead (10, 10 ').

8. Pressure lid can according to one of claims 1 to 7, characterized in that an inwardly embossed upper fuselage bead (20) is arranged over the closure bead (10, 10 ').

9. Pressure lid can according to one of claims 1 to 8, characterized in that between the closure bead (10, 10 ^« ) and the engagement lip (8, 8 ') a sealing means (22) is provided.

10. pressure lid can according to one of claims 1 to 9, characterized in that the fuselage element (6) with the fuselage body (2) is in one piece.

11. Pressure lid can according to one of claims l to 9, characterized in that the fuselage element (6, 6 ') with the closure-side end of the fuselage body

(2) via a double fold lock (24).

12. Pressure lid box according to one of claims 1 to 11, characterized in that the engagement lip (8) is formed by rolling the edge of the lid body.

13. Pressure lid can according to one of claims 1 to 12, characterized in that the gap width is reduced in at least a part (28) of the circumference and that a lever engagement region (30) is provided with respect to the region reduced in the gap width.

14. Pressure lid can according to one of claims 1 to 13, characterized in that the pivot axis (32) for the engagement lip (8,8 ') lies above the plane defined by the sealing bead (10,10').

15. Pressure lid box according to one of claims 1 to 14, characterized in that the pivot axis (32) for the engagement lip (8,8 ') in the periphery of the upper edge of the lid upper part (5) extends directly next to the lever gap (26).

16. Pressure lid box according to one of claims 1 to 15, characterized in that the upper edge (16) of the fuselage body (2) is rolled inwards, and a support surface for the lid body (4,4 *, 4 '', 4 '" ) forms.

17. Pressure lid box according to one of claims 11 to 16, characterized in that the Hebelspalt¬ width by eccentric design of the Deckel¬ upper part (5) in the circumferential direction has a constantly changing width.

18. Pressure lid can according to one of claims 1 to 17, characterized in that the fuselage element (6, 6 ') is arranged in an inwardly tipped upper Rumpfab¬ section (34).

19. A method for producing a hermetically sealed lid closure for a pressure lid can, characterized by producing a radially outwardly embossed sealing bead in the body of the pressure lid can, filling the sealing bead with a liquid sealant, inserting a lid body with a radially outwardly spring-loaded engagement lip by snapping the engagement lip in the sealing bead with still liquid sealant.

20. The method according to claim 19, characterized by the production of a radially inwardly embossed upper fuselage immediately above the sealing bead.

21. The method according to claim 20, characterized by the subsequent deepening of the upper fuselage bead after assembling the lid closure by inserting the lid body to adjust an optimal material, dimension and / or filling-specific ratio between pressure resistance and opening behavior.

22. The method according to any one of claims 19 to 21, da¬ characterized in that the engagement lip is formed by rolling the edge of the lid.

23. A method for producing a hermetically sealed lid closure for a pressure lid can, the production of a sealing bead which is embossed radially inwards in the body of the pressure lid can. the production of an engagement lip with a radially inwardly embossed engagement bead, the filling of the engagement bead with liquid sealant, the insertion of a cover body with a radially outwardly spring-loaded engagement lip by snapping the engagement bead provided with still liquid sealant into the closure bead.

24. The method according to any one of claims 19 to 23, characterized by the insertion of the closure area in the upper part of the fuselage to a reduced diameter and the introduction of the fuselage-side closure elements into the reduced diameter area.