DE1432139A1 - Closure on plastic containers - Google Patents

Description

10 44;

PATENT LAWYERS

DIPU-INQ. FRITZ THIELEKE DR.-INQ. RUDOLF DÖRING DR. JOACHIM FRICKE

BRAUNSCHWEIG - MUNICH

1432 ^ 39

Continental Can Company, Inc., Uew Toric 17, I.Y. / UNITED STATES,

653 Third Avenue

"Closure on plastic containers"

The invention "relates to a closure on containers with a neck part made of plastic, in which _{locking elements which come into locking engagement are provided on the neck part of the container and Ä} on an apron section of a closure cap made of flexible material when the cap is pressed on or screwed on, and the closure cap has a locking element in from the end wall the container neck engaging inner circumferential wall, which is connected to the skirt section via a connecting section bent in cross section - the edge of the container neck being sealingly received between the skirt section and the inner circumferential wall when the cap is on.

A container made of sheet metal is known, the neck of which compresses one has a stiff edge which is pressed into a circumferential groove or between two circumferential lips of the cover can. Here, the seal is brought about solely by the elastic clamping force or the deformation force of the lips themselves. The lips need to be flexible enough to allow them to expand be able to adapt to the irregularities of the stiffened edge of the container neck and provide the required sealing, guarantee. On the other hand, the Liirpen can only have a sufficient clamping force, which is also used for sealing

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is necessary to maintain if they are made 'relatively thick Material are made. A thick material, on the other hand, is a hindrance the suppleness of the lips to the irregularities of the sealed Container edge.

In contrast, it is an object of the present invention to form a closure for containers of the type defined at the outset so that the cooperating with the container neck edge portions of the closure cap can be kept sufficiently thin to be able to reliably and sealingly conform to the container rim, without that the forces required to press the sealing parts together depends on the thickness or flexibility of the lips'.

This object is achieved according to the invention in that the container neck surrounds the inner circumferential wall of the closure cap with radial play and ends in a flexible edge flange bent towards the container axis, the free edge of which, when the cap is in place, rests against an abutment shoulder on the outside of the inner circumferential wall and its axial edge Length. Is dimensioned so that. When the cap is in place, the splash can be elastically clamped between the abutment shoulder and the locking elements while being pressed against the connecting section. -

With the new arrangement, the edge area of the container is also flexible and not thickened. The arrangement is like this met that a clamp & raft between inner peripheral wall and Apron section cannot occur at all and is also not needed

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■ will. Rather, the inner peripheral wall does not touch the Inner surface of the container neck. Rather, the elastic edge flange of the container sleeve is braced in its longitudinal direction, this tension between the counter-log shoulders and usual locking elements of the two parts takes place. The flexible edge flange can be tight and sealing Press against the inner surface of the apron and connection section. Both the rim flange of the container and the as aucij the cooperating parts of the apron section can be sufficiently supple to ensure a reliable seal. The seal is made via a large "!" laughing area, with intimate contact between the , auver / ^ - ^ ig can be sustained.

Advantageously, the thickness is in the area of the neckline , section of the connecting section Mnd of the inner utDfangwand chosen so that they match the wall thickness in the remaining areas the cap significantly exceeds.

The invention is explained below with reference to schematic drawings explained in more detail using two exemplary embodiments. On these drawings ibg: ■ ·

I ^l ig. 1 partial view of an embodiment of a container closure device according to the present invention;

Pig. Fig. 2 is an enlarged vertical section through the alternate parts "Drawn parts" of the closure member and container removal opening according to "Pig. T before their union;

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Pig. 3 is an enlarged vertical section along the line 3-3 the pig. 1 through the closure member and the container removal opening after their subsequent union;

Pig. 4 is a partial view of another embodiment of a Closure device according to the present invention;

Pig. · 5 · an enlarged vertical section through the expanded Parts of the closure member with a container removal opening according to Pig. 4 before their union;

Pig. 6 is an enlarged vertical section along line 6-6 the pig. 4 through the closure member and the container ent-r opening after their subsequent union.

In the Pig. 1 is the new container closure device generally designated init 10 and consists of the snap-lock member 11 and the container 12. The closure member 11 and

) the container 12 are made of a conventional thermoplastic material

manufactured according to the well-known injection and blow molding processes. . .

The closure member 1 ι has a middle flat surface 14, which is at a distance above a clamping surface 14 and with this by a first step surface 15 arranged at an angle to it communicates. An inner wall 16 extends from the Clamping surface outwardly and upwardly and is held inwardly by an arch part 18 at a distance from an outer wall 17.

This is done, especially like Pig. 2 shows in such a way that they form an annular cavity 19. The inner wall 16 has

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A thickened rope 20, which extends into the annular space 19 and a sealing shoulder 21, which faces upwards and outwards, and which is close to the arch part 18.

The stop rib 22 formed by the outer wall 17 extends from this wall inwards in the direction towards the ^tt and 16 .. The stop rib 22 is preferably designed as an annular rib; it can also be formed by a number of narrow nipples or projections (not shown) .

A flap 23 is formed in one piece with this on the wall 17 ( FIG. 1) and serves as an aid for removing the closure element 11 from the container 12. FIG. 1 shows two lines of weakness 24 in the outer wall 17 which delimit a tear strip 25 which is connected to the tab 23. A reinforcing rib or bead 26 forms a thickened cross-section near the innermost ends of the line of weakness 24 which stops the tearing process along the lines of weakness and thereby keeps the closure member 11 essentially intact and usable for resealing the container.

The container 12, as best seen in FIG. 2, consists of a tubular body 30 having a neck portion 31 and an upper container portion, indicated generally at 32. This "section is an upwardly and inwardly curved arch 33 with an obliquely upwardly and inwardly inclined flange 34. Its edge 35 forms a large removal or filling opening 36 of the container 12. The upper container section 32 goes into the

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Neck part 31 over and jumps outwards from this, namely for the purpose of forming an annular locking head 37 * This has an outwardly and downwardly directed locking surface 38, which extends around the entire circumference of the container neck.

A comparison of the pig. 2 and 3 shows that during the application of the snap-lock element 11 to the container, the central surface 13 and the clamping surface 14 are first pushed into the mouth or filling opening 36, and that on the band 35 of the elastic. Flange 34, the inner wall 16 rests. As the closure member 11 is pressed down further on the container 12, the upper container section 32 is pressed behind the locking rib and deformed so that it gets into the annular cavity 19, where it is the contour of the arched part 18 adapts. When the closure member 11 is pushed completely onto the container 12, the locking rib 22 lies just below the locking surface 38 'of the annular locking head 37. The edge 35 of the upper container part 32 is here against the. Shoulder 21 of the inner wall 16 pressed firmly, whereby a tight seal between the elastic flange 34 and the thickened arch part 18 is achieved. The tightness of the closure is not only a result of the large contact area between the upper container part 32 with the outer wall 17 and the thickened arched section 18 '. but also based on the tendency of the resilient flange 34, from the bent state of FIG. 3 to spring back to its original Scbrägform according to Fig.2.

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The modified embodiment shown in Figs. 4-6 the closure device is generally designated by 50 "and "consists of the closure member 51 and the container 52, which in turn both can be made from thermoplastics by known injection or blow molding processes.

The closure member 51. has a central surface 53, an inner wall 54 and an outer wall 55, which is formed by an arched part connected to one another and held at a distance from one another so that they form an annular cavity 57 between them. the inner wall protrudes downward from the central surface 53 and is connected to it near the arch portion 56. A locking shoulder 58 is on the inner wall 54, preferably below the arch portion 56, formed. It points from the wall 54 upwards and outwards undercuts the curved portion 56 substantially perpendicular thereto. The closing element 51 has an inner screw thread 60 the inside of the outer wall 55 provided for the purpose of security of the closing element 51 on the container 52.

On the central surface 53 are a number of square protrusions 61 formed which rise from it at a distance from each other, such that between them two diametrical slots 62 for the engagement of a lever-like tool, not shown, for Close and open the closure member 51 on the container 52 are formed. The slots 62 are of such a width that they iron mixing rod, not shown, for example for paint or the like., able to accommodate, which then forms a suitable tool for opening and closing the closure member 51.

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. The "container 52 is exactly the same as the container 12, and he orders from a tubular container body with a shark part 71 and an upper container part, indicated generally at 72 ie *., J This part is curved upwards and inwards at 73 and marked with a | j inwardly directed resilient flange 74, of which; '""., ·

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Edge 75 the large mouth or! Filling opening 76 of the container 52 \ ⁴

forms. The upper container part 72 merges into the neck part 71, j

on which a spiral screw thread. 77 for the engagement in the -, -

Screw thread 60 for the purpose of securing the closure member 51 on which _: - 'Container 52 is provided.

When comparing FIG. 5 with FIG. 6, it can be seen that i when closing the closure member 51 on the container 52, "■". "J, the central surface 53 and the inner wall 54 ^{cover the filling opening 76 | v} . In As the closure member 51 is screwed onto the container 52, the upper part 72 moves into the annular cavity 57, the flexible flange 74 being deformed so that it adapts to the shape of the arched part 56. Is that Closure element 51 is screwed onto container 52, then edge 75 has come to rest against locking shoulder 58 and forms a tight seal between flexible flange 74 and arched part 56. The tightness of this seal is not only a result of the large contact surfaces between the upper one Container part 72 and the outer wall 55 and the arch part 56 'but it is also based on the tendency of the flexible flange 74 to move from its deformed shape, as shown in FIG. 6, to its unstressed A spring back initial form according to FIG.

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As can be seen from the detailed description above results, the various id types disclosed therein are suitable and vessels of yersolar organs especially good for any Liquids without fear of leakage. The inwardly bent flexible flanges 34 and 74 are not only particularly suitable for producing a tight seal, but these edges 35 and 75 form if the container is intended to hold paints or varnishes, for example, also very effective wiping edges for the paint brush or the like.

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Claims (2)

Claims 1. Closure on containers with a neck part, in which the neck part of the container and on a skirt section of a closure cap made of flexible material when the cap is pressed on or screwed on is provided with locking elements and the closure cap engages in the container neck from the end wall having inner circumferential wall, which is connected to the apron section via a connecting section bent in cross section, the edge of the container neck being accommodated in a sealing manner when the cap is attached between the apron section and the inner circumferential wall, as by gek e η τι ζ. e 1 ch η et that the container base (32,72) surrounds the inner circumferential wall (16,54) of the closure cap (10,50) with radial play and ends in a flexible edge flange (34,74) bent towards the container axis, the free edge of which rests against an abutment shoulder (21,58) on the outside of the inner doorway wall when the cap is in place and its axial length is such that the flange between the abutment shoulder and the locking elements (22,60) when the cap is in place. can be elastically clamped under pressure on the connecting section (18,56). 2. Verse Must according to claim 1, dadurchgeke η η - ζ eich η et that the wall thickness in the area of the apron section, the connecting section and the inner peripheral wall substantially exceeds that in äen fbrigen areas of the cap. New documents (Arf. 7 sv.4.9.19671