DE2113921A1 - Closure cap for bottles or the like. - Google Patents

Description

PATENT LAWYERS ~ l

DR.-ING. R. DOERING D.PL.-PHYS. DR. J. FRICKE

BRAUNSCHWEIG. MUNICH

Continental Can Company, Inc. 633 Third Avenue, New York 17, N.I. United States

"Closure cap for bottles or the like"

The invention relates to a closure cap for bottles or the like, with a neck section provided with threaded elements, in which an apron section protrudes downward from the cap mirror, which can be pushed axially over the neck section and a radially constrictable one to form thread mating elements Has section.

For closures of beverage bottles are mainly

Crown caps or crown caps used. Such a crown cap when pressed on has a corrugated skirt section which is normally under a bead of the bottle neck is knocked down. It has also been proposed to apply a crown cap to a container bals, in which outer threads or threaded elements are provided in order to obtain a closure that can be screwed

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movement can be solved. It did, however, show that the short, outwardly inclined apron section of a typical Crown cap does not have sufficient thread engagement when folding makes it possible to establish that a thickly seated bloom is inherited, which can be loosened again by screwing. In addition, the crown cap can be used for the screwing process cannot be seized because the crown cap is sharp Has corrugated back and a corrugated protruding sharp edge. The cap can often hardly be turned and the user can cut his fingers on the edges. A Resealing is also difficult and often not practically feasible.

A crown-type cap has also been proposed to be provided with a protective edge. The lip of the cap can be curled inwardly or curved in some other way to shield the edge when the cap is on the bottle. Such caps often require additional ones Operations and additional material or both, compared to crown caps of the usual shape. Even relatively small ones Increases in costs prove to be very disadvantageous since there is fierce competition between manufacturers. Farther difficulties remain in forming adequate threaded members in the corrugated skirt portion of typical Crown caps.

Furthermore, caps have been put on the market which

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can be provided with threads or threaded elements by rolling processes. For this purpose the caps usually made of aluminum and are provided with a cylindrical skirt portion which extends over the Can grasp container neck or bottle neck when the cap is pushed on vertically. While the cap is in the sealing position is pressed against the edge of the bottle, threads are rolled in the skirt portion, wherein the neck of the bottle provided with threads as an abutment | serves.

The material cost of an existing aluminum with rollable Threaded caps are generally very tall. Commercially available tinplate can usually be used or the like, as cheap types of this material do not have the properties required for rolling of threads. The rolling of the threads requires special equipment and is generally slow Method of operation compared to the usual rolling process for " Crown caps. Furthermore, the rolling process for the threads requires that most of the apron section is free of corrugations or other reinforcements, so that the skirt portion tends to become irregular due to Throwing tension, getting tired or the like. Therefore, the opening moments as well as the properties are often to be reclosed the closure of such rolled-up caps is often insufficient. A reinforcement of the apron sections with

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The help of beads, curls, pockets or similar formations requires special tools, special work tools or both, so that the manufacturing costs increase.

Ss 1st object of the invention to provide a closure of the initially further developed in such a way that the closure cap is easily applied by pressing on vertically and can be removed again by screwing, the sap being made of cheap material and in a cheap way can be produced and applied.

This object is achieved according to the invention in that the Flatten the apron section in one of the threaded elements Neck section of the bottle corresponding height range in the circumferential direction at spaced straight, outwardly projecting ribs and straight beads lying therebetween. Here, the cap has a generally cylindrical one Apron section that protrudes from the top mirror. The apron section can be at the bottom in a circular edge end up. The skirt portion is made of sheet material of single thickness and includes the one with ribs and beads provided or corrugated section, the length of which is approximately equal to the total length of the thread area on the bottle neck. at the ribs and beads distributed in the circumferential direction, which run in a straight line and advantageously parallel to the cap axis, the backs of the ribs lie on a common one

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Cylinder surface. The ribs extend from one sieve Level off just below the cap mirror up to one Level that is at a distance from the edge of the apron. The lower The skirt portion extends from the lower ends of the hips to the skirt edge. This section is in shape a cylinder which has essentially the same diameter as the cylinder in which the backs of the ribs lie.

The deepest points of the beads also lie on a cylindrical surface, the size of which is selected so that this section telescopically tightly over the outer threaded elements of the bottle neck can slide on which the cap is to be applied. The depth of the beads is greater than that Thickness of the material of the skirt section and approximately the same as the depth of the threaded elements on the bottle neck. When the apron section is constricted uniformly over the Threaded section area of the bottle neck, corresponding thread counter elements are produced in the skirt section in that the material is bent along the lines of the beads is, while otherwise the skirt retains its substantially cylindrical shape. The depth of the beads is not less than the effective depth of the threads on the bottle neck. The constricted lip of the apron section can Easily pass the back of the threads on the bottle neck when the cap is twisted off or unscrewed.

The cap of the present invention can easily be doubled from sheet metal in a single operation

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acting punch press are generated, with an elnfacber Form set is used. The cap training leads from sieve out to use thin tin-free steel, which Stress cracks, spoilage of the coatings and the decoration are kept to a minimum. The corrugations are in larger number than is usually possible with crown caps. The adjacent ribs give the Cap have a high degree of radial rigidity and reduce the occurrence of deformations and distortions when constricting, so that the thread mating elements in the apron section are formed exactly in accordance with the threads on the container can be. This ensures a secure hold of the cap on the bottle and reduces the tendency that sieve throws the seba apron material. Furthermore, a larger linear thread engagement can be achieved for a given skirt length than with the corrugations typically found in standard crown caps.

After the constriction is the outer diameter of the apron section over the largest diameter of the threaded elements about the same as the diameter of the rib back and the adjacent smooth lip of the apron. The resulting surface forms a very grippy section that can be safely and comfortably grasped with the fingers to unscrew the cap.

The invention is illustrated below using schematic drawings

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explained in more detail using several exemplary embodiments:

Pig. 1 is a side view of a closure cap for bottles according to the invention;

Pig. 2 a partially sectioned on an enlarged scale Side view of Pig's cap. 1;

Pig. 3 is a vertical section similar to that according to Pig. 2, but with the cut in a different plane lies;

Pig. Figure 4 is a horizontal section along section line 4-4 of Pig. 2;

Pig. 5 shows a similar section to Pig. 4 through a modified embodiment; i

Pig. 6 and 7

similar cuts as in Pig. 2 and 3 after the cap has been axially pressed onto a placket neck;

Pig. 8 shows a side view of the flasebar applied to the flashlight and drawn in in the apron section Sealing cap;

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Pig. 9 shows a side view of the cap on an enlarged scale after Pig. 8, partially cut;

Pig. 1o, 11 and 12

similar views as the Pig. 2, 3 and 9 of one modified embodiment.

The one in Pig. The cap shown in Figure 1 is adapted to be fitted onto the threaded members of the neck of a tab can be, which z. B. intended for carbonated beverages is. A substantially cylindrical apron section 11 terminates at its lower end in a circular edge 12. The skirt portion 11 is dimensioned so that it fits over the threaded container neck with a single seat telescopically pushed and on the container base by a substantially uniform constriction of the skirt section can be attached.

Like from Pig. 2 shows, the cap 1o has a curved one upper lid mirror 13, which is connected to the skirt portion 11 by a bent portion 14, the a sealing recess determined. The skirt section 11 is with a circumferential series of corrugations 15 verseben, which form outwardly projecting axially extending ribs 16 and intervening beads 17, extending from the bottom of section 14 to the

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lowermost ends 18 extend in a horizontal plane which is at a distance from the circular edge 12. the ! Area of the lip 19 which lies between the plane of the ends 18 the beads and the edge 12 runs, lies on a cylinder which is essentially the same diameter like the cylinder on which the backs of the ribs 16 lie. As best seen in Fig. 3, the The depth of the beads 17 is somewhat greater than the thickness of the material of the apron section 11, the depth being approximately equal to the height | which corresponds to threaded elements running along in the material the bottom lines of the beads are to be formed.

From Pig. 4 it can be seen that a preferred pattern of the corrugations is that the ribs 16 are somewhat narrower than the width W of the corrugations. The cap can be made from steel sheet No. 55. A cap made of this material preferably has about 40 corrugations for a standard beverage bottle opening. This corrugation pattern provides radial rigidity as well as circumferential compressibility while maintaining the generally cylindrical shape uniformly around the apron portion with the application of radially inward pressure. The aforesaid steel material is considerably cheaper than the tinplate material No. 75-9o commonly used for crown caps, which is used for the same purposes as the present closure caps. The material at the end of the corrugations is on

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the inner circle adjusted to be substantially linear To achieve arrangement of the material. The material defining the grooves 17, which is preformed in this way and the rather high thermoforming properties of a Double thickness reduced thin sheet material, requires only moderate constriction forces for forming the thread mating elements. There are significantly lower deformation forces required in the formation of the thread counter elements along the deepest points of the beads than in the case of deformation of a usual corrugation of crown corks.

Fig. 5 shows a slightly modified corrugation pattern for the Cap of the same size as shown in FIG. With the Pig pattern. 5 the corrugations are essentially sinusoidal, the beads 217 essentially having a have the same radius as the ribs 216. This corrugation pattern creates radii on the back of the ribs and the indentations the beads, which keep deformation as small as possible during manufacture.

6 and 7 show the cap 1o in one position a bottle neck 2o in front of the constriction of the apron section 11 around the threaded elements 21 on the bottle neck 23. A seal or liner 24 extends along the mirror 13 and the radius 14 so as to form a seal on the top and along the lip 25 when the cap 1o is pressed on. The grooves 17 are essentially

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union of the same axial length as the threads 21, the material of the skirt along the line of the beads in close proximity the backs of the threaded elements on the bottle neck 23 lie. The ribs 16 and the lip 19 point against it a radial distance from the threaded elements 21, the distance corresponding to the depth of the grooves.

The cap 1o can be seated ä for applying crown corks on the bottles in a Krönenkorkenmaschine of the general type. Usual tool, which is shown in dash-dotted lines in the Pig. 6 and 7 indicated, can be used, which comprises a sealing stamp 4o, a Htilsenstempel 5o, a squeezing tool 6o and an abutment ring 7o. The stamp 6o consists of elastotnerem material z. B. made of rubber. While the cap 1o is held in the sealing position as shown, with the aid of the punch 4o, the sleeve punch 5o is lowered, the squeezing tool 6o being pressed against the ring 7o. The squeezing tool deforms the skirt section 11 uniformly radially inward in order to constrict the skirt section around the bottle neck 23.

8 and 9, the cap 1o after constriction of the Apron section 11 can be seen, with thread mating elements 22 being formed in the constriction area. As shown the threaded elements 21 comprise half-threaded elements of a composite thread. The slope can be a little bigger

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than the thread width on the pitch circle. This is a preferred one Design of the thread, through which a good thread engagement is guaranteed, but with wide foot sections be achieved, which correspond to the thread counter elements 27, which are in the radially inwardly displaced material areas along the bottoms of the beads 17 between the threads 21 are generated. The selected thread pitch is generated a rather high local bending stress in the apron material, as far as it rests against the crests of the threads 21. This creates an exact contouring of the apron material the deepest points of the beads 17 above and around the threads 21 around, so that a number of thread counter elements 22 is created, which attack the elements of the threads 21 reliably. The entire linear engagement is approximately equal to the value W * Ii 'T, where W is the width of the corrugations according to Pig 4 and 5, If the number of corrugations and T represent the number of threads on the container neck. This training creates excellent holding forces under high load, even with a large thread pitch angle. The formation of the threads 21 as shown reinforces the easy removal and reattachment of the cap. A short Rotation releases and develops the cap for slimming a reliable seal on reclosing with moderate torque.

If uniform force is applied, the material will lay out a & B Schtirr.enabpjcbril ttes along the

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Bottom lines of the beads 17 on the backs of the threads 21. The material bends over and around the threads due to the local bending stresses that arise. The material that forms the ribs 16 settles not on the threads. Therefore, there are no significant bending stresses in the area of the ribs. Since the ribs 16 are sufficiently stiff to avoid flexing under the sebum tension that occurs when the material is bent along the ^ The ribs are practically not deformed. Rather, the ribs 16 remain essentially straight and ensure an even distribution of the pressure reduction of the apron section. This accordion effect prevents irregular bulging or wrinkling. To To complete the constriction, the diameter in the area of the back of the ribs 16 is smaller than the original Diameter, namely by an amount approximately equal to twice the depth of the thread turns 21. Furthermore, the outer diameter is of the skirt section in the area of the largest diameter f of the thread counter elements 22 approximately the same as the diameter in the area of the backs of the ribs 16.

The cylindrical contour shape of the lip 19 is not substantially reduced by the constriction process and the stresses influenced, the lip being protected against bending or curling by the stiffening effect of the ribs 16. To the constriction, the lip 19 has an inside diameter that is slightly larger than the largest diameter of the

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Threaded elements 21 is. When unscrewing the cap 1o can so slide the lip easily over the threaded elements 21.

The length of the beads 17 is essentially equal to the whole axial length of the threaded portion 21, so that a reliable thread engagement is guaranteed. The depth of the Beading is approximately equal to the depth of the threaded elements 21, which is essential for the reliable shaping of the threaded counter elements 22, which should completely encompass the threaded elements. Due to the stiffening effect of the ribs 16 the constricted cap has good shape retention properties because of the good thread engagement, so that the cap can be unscrewed with little torque and has good re-closure properties be achieved. The general rigidity of the skirt portion is such that it gives a good one Provides resistance to buckling of the material that is otherwise the result of irregularities or trapped Stresses can be found either in the initial manufacture of the cap or in the manufacture of the closure can form.

As previously noted, lip 19 is cylindrical. The backs of the ribs 16 and the threaded elements 22 are of the same type Diameter, namely elements of the same cylinder and are rounded. The essentially cylindrical grid that is formed here, forms a grippy section of smooth umrißgestalt, which is reliably and comfortably gripped

* can be. There is no cutting or injuring the fingers

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possible. Since only moderate pressure is exerted when grasping the cap must be, the risk of injury to the fingers is further reduced. Screwing the cap is made easier due to the well-formed thread element G in the apron section and the low tendency to adopt an oval shape or to deform in some other way, which ensures that a good sealing pressure with a low torque relatively coarse thread is achieved, which is preferred for quick opening and reclosing. These characters- | ristics are particularly beneficial for beverage bottles that are often opened by children.

The Pig embodiment. 4 is particularly suitable for the formation of good threaded elements and good holding forces. the Elements 217 are originally inwardly concave. A much smaller deformation is here in the shaping of the Material around the threaded elements 21 to be expected. The necessary constriction of the apron section can easily be achieved by j

with slightly lower radial pressure than in the case of inwardly convex bead floors, as shown in FIG. 5 . The choice of the number and shape of the corrugations, however, requires an exact adaptation to the properties of the cap material, the cap size, the thread shape and the quality of the container neck.

1o and 11 a forgery-proof embodiment of the cap according to the invention is shown, which cap

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11o is essentially the same as the zap 1 ο with the exception of the ■ greater length of the apron section beyond the corrugated section. The corrugation length is the same for both Caps if the same thread design is used. The skirt portion 111 protrudes from the mirror 113 along one Radiusabscbnittes 114 down, with the ribs 116 and Hats 117 in a plane at 118 at a distance from the edge 112 ends. However, it is a longer cylindrical section 119 between the plane of the corrugation ends 118 and the edge 112 than provided on lip 19 of the cap previously described.

Section 119 is between ends 118 of the corrugations and the edge 112 with narrow ones distributed in the circumferential direction Seam slots 13o. Here, a grater of short, easily broken bridges 131 remain, which the upper and connect the lower band of the edge portion 119. The orientation and the spacing of the bridge sections 131 are selected so that they are each in alignment with a rib 116 stand. The cap 11o can be manufactured in the same manner as the cap 1o with the exception of a minor adjustment the length of the apron and tools.

aluminum is preferred as the material for the cap 11o. this is better suited for anti-counterfeit caps because aluminum generally has the desirable properties of tensile ductility and breakability of the bridges.

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It is clear from Hg. 12 that the closure cap 11o can be applied to a bottle neck 12o in the same general manner as has been described with respect to the closure cap according to FIG. The lip 132 is then folded over under the shoulder 133 below the threaded section 121. This folding process can take place simultaneously with the constriction of the apron section with the aid of a pressure tool similar to the tool 1o according to FIG. 6. The lip 132 is spaced from the ribs 116. Since aluminum is easily deformable, a generally uniform radial necking pressure is sufficient to mold the skirt portion to the threaded portions 121 and to crimp the lip 132 against the shoulder 133. Alternatively, the lip 132 may be formed under the shoulder by a rolling process or otherwise with an auxiliary tool. A collar 135 prevents excessive restriction of the Scbürzenabsennittes 134 and the ribs 131. Such Ausfübrungsform j can also be 1o for caps according to FIGS. 1 to 3 is provided.

After the closure has been made, the anti-falsification is effective the cap 11 o in the same way as other caps with easily breakable bridges. The intervention of the after inwardly folded lip 132 on shoulder 133 prevents the cap from rising during initial application of the Torque. Sufficient tension is then applied to the bridge elements 131 to cause them to break.

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The lip section 132 then falls down and gives way a clearly visible sign that an attempt to open it has been made, even if the cap has not yet been unscrewed has been. After the bridge sections have been broken, the cap body can be unscrewed to open the bottle will. The body of the cap 11 o is essentially the same as that of the cap 1 o in terms of shape, training the threaded sections, 'grip and the ease of unscrewing and reclosing. The inside diameter of the constricted apron section 134 as well as the partial circle on which the bridge sections lie are somewhat larger than the largest diameter of the threads 121 on the bottle neck. This ensures that the lower section of the apron as well as the remains of the broken bridge parts can easily pass through the threads, when the cap is unscrewed.

From the Pig. 2, 3, 9 and 1o it is clear that the cap shell Both types of caps can easily be made from sheet metal in a punch press with simple tools. the Equipment and settings used are essentially the same as those more commonly used in manufacture Crown caps are used, being worked with comparatively high manufacturing speed and large savings can be. The tools for the normal as well as for the counterfeit-proof cap can be similar in their design

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The only difference is the size of the blank and the depth of deformation.

Pig's normal cap. 1 has a apron section 11 of about the same length as usual Crown caps for similar piaquakes the pail is. The cut size of the bare cap according to the invention is the same about the same as the cutting size for crown caps. This leaves the same number of caps in both cases i Manufacture from the same sheet size. Since the normal cap, as described herein, can be made from inexpensive tinplate or tin-free steel of lesser thickness As is possible for the manufacture of crown caps, the overall material costs for the cap according to the invention are generally lower than for conventional crown caps.

The forgery-proof crown caps according to the Pig. 1o and 12

have the same length and shape at the top of the bridge sections *

like the complete normal cap based on the same size and the same shape of the cone neck. Only as much additional material has to be used as is necessary to manufacture the counterfeit locking ring 132. Both the normal and the counterfeit-proof embodiment of the cap according to the invention can be used shorter than the closest practical roll-on type cap.

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Measurements according to the present invention can also be adapted for relatively fine threads, namely due to the easy thread formation with the aid of an assembly tool. In contrast, a folder intended for thread winding treatment is in) generally only for relatively long _? coarse threads suitable. The locally high tool pressure in the production of rolling threads requires a free rotation movement of the tool bearing in order to avoid tearing off the bag sis and to keep the tool break small, which occurs as a result of the fixed rolling tool hitting the threads or by excess side pressure A roll-on cap thus often requires a much longer skirt than an equivalent cap according to the invention for corresponding thread engagement Regarding the size of the blank as well as the material thickness, thinner materials can be used with the invention because of the reduced risk of the material buckling or buckling when a uniform pressure is applied over the entire apron section d, which is contrary to the concentrated pressure in the reeling process.

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Claims (8)

2113S21 Claims Γ 1J cap for bottles or the like with a neck portion provided with threaded elements, in which void cap mirror an apron section protrudes downwards, which can be pushed axially over the neck section and for formation of thread mating elements a radially constricting one Having section, characterized in that that the skirt portion (11) in a neck portion provided with threaded elements (21) (23) height range corresponding to the bottle circumferentially spaced straight, outwardly projecting ribs (16) and intermediate ribs has straight Sieken (17). 2. Closure cap according to claim 1, characterized in that the backs of the ribs (16) lie in a common cylindrical plane in which there is also an apron edge (19) adjoining the height area (16, 17). 3. Closure cap according to claim 1 or 2, characterized in that the ribs (16) and Corrugations (17) essentially parallel to the cap ahee 10988A / 0176 get lost. 4. Closure cap according to claim 1 to 3, characterized characterized in that the skirt portion made of sheet metal with a uniform, uniform bead, in particular made of tinplate or other sheet steel consists. 5. Closure cap according to claim 1 to 4, characterized in that the beads (17) have a the height of the threaded elements (21) of the neck portion (23) have a depth corresponding to, such that at Constricting the height range, the threaded counter elements (22) essentially only by deforming the Beads (17) can be generated. 6. Closure cap according to claim 5, characterized in that that the depth of the corrugations (17) is greater than the corrugation of the corrugation and rib-forming Sheet metal section is. 7. Closure cap according to claim 2 to 6, characterized in that the constricted State of the skirt section (11) the inner diameter of the cylindrical skirt section is essentially is not! your than the maximum diameter of the threaded elements (21) of the neck portion (23). 109884/0176 8. Closure cap according to claim 2 to 7, characterized characterized that on the edge of the apron via an annular weakening line (I3o) (131) a retractable or deformable securing section (132) follows. 109884/0176