DE2012030A1 - Process for the production of a knurled container cover and container cover produced according to this process - Google Patents

Description

DR. ING. E. HOFFMANN · DIPL. ING. W. EITLE DR. RER. NAT. K. HOFFMANN

PATENT LAWYERS

- "D-8000 MÖNCHEN 80 · MARIA-THERESIA-STRASSE 4 · TELEPHONE (0811) 441061

Aluminum Company of America, Pittsburgh, Pa / USA

Process for the production of a knurled container cover and container cover produced according to this process

The invention relates to a method for producing knurled container lids and according to this method Manufactured container lids, in particular a twist-off lid! knurling with protruding areas enlarged Diameter in relation to the diameter of the cap with a continuous ring-shaped fringed

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Delten strips, partly on the cover and partly on the cover is formed on the cover plate of the lid.

The closure cover tecfrik knows different types the application of shape changes that require manual detection to exert a rotational force to remove the cover facilitate. These changes often consist of a knurling, which in the circumference of the cover shell in Intervals is provided.

Knurling can be provided in various ways. In the case of plastic lids, it can e.g. be molded. In the case of metal lids, it is usually provided in such a way that a radially inward acting If the lid jacket strengthens the circumference of the lid in spaced apart from each other is formed inwards. By the indentations provided in this way knurled areas are created whose maximum diameter is the same as the diameter of the original Lid cone or slightly smaller. Of the The diameter of the indented areas is much smaller. Since such a knurling is limited with respect to its maximum diameter by the diameter of the lid an enlarged knurling area could only be achieved by using a cap with a larger diameter be created.

In some cases it is also an outward one Deformation of the Deciielmantels attached so to create an enlarged knurling diameter. Through this there are some advantages over the vulnerable features of the inward-facing features mentioned above Knurling.

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To improve the usability of the knurled this is often drawn over the entire D _e ckelmantel. Since the knurling is generally used in lids provided with threads or serrations, the goal of a maximum knurling length collides with the goal of applying a high-performance thread or a similar serrated area. However, the knurling is often pulled over the thread in a downward direction.

There is no effective method to achieve { Randelungsform of maximum efficiency Twist-off lids, avoiding the problems mentioned above.

According to the invention, this is achieved by a method for producing a knurled container top, in which a generally cylindrical® cover hat is provided, which has a cover plate and a depending therefrom having annular jacket, characterized by the formation of a plurality of continuous, outwardly directed knurled areas, each of which lies within a plurality of first arcs located on the circular arc, which are all essentially the same size sen, by bending these first arches outwards to to create a lower section in each of these ideals, which extends radially outward from the annular cover shell, up to a diameter which is larger than the original diameter of the shell, and to form a top portion that adjoins the lower section and extends upwards and outwards from the cover plate; and through training a multitude of consecutive, inward-looking ones

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Knurled areas, each of which lies within a plurality of second arcs lying on the circular arc, all in have essentially the same size and are arranged alternately with the first 'arcs on the circumference of the circle Restraining these second arcs from bending outward while forming the "outward" ones Knurled areas, with the lower sections of the outwardly and inwardly directed knurled areas on the upper one Half of the depending annular shell can be formed.

The invention also provides a method for producing a cover which has an annular Edging strip is provided, which is after outwardly extending knurled area over the diameter of the cap or workpiece radially outward protrudes, over an upper region of the cover shell and an area of the cover plate. The knurled one The strip consists of outwardly directed knurled areas, which on the circumference of the cover shell with inward alternate directed knurled areas. The outward-facing areas are preferably V-shaped in cross-section, while the inwardly facing regions are substantially planar in cross-section. Though practically a little curve in the direction of the inward one Area results, this is hereinafter referred to as "essentially flat". Any outward-facing Area is formed within a first arc on the circumference. The outward facing areas are preferably formed within first arcs lying on the circumference, which in total approximately 10 to

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Take 20 io of the entire circle circumference of that area of the cap. which the edge strip is formed. The knurled areas according to the invention can start on the upper half of the cover shell and extend continuously curved upwards and radially inwards over the upper part of the shell to the cover plate.

The inventive method thus sees the Formation of knurled areas directed alternately inwards and outwards. The first arc on the circumference | is formed radially outwards, while the subsequent second arcs on the circumference of one radially outward movement are restrained. The first arcs on the circumference of the Cover shell moved radially outwards and upwards and outwards on the cover plate. This will be for a particular after outwardly directed knurled area accomplished essentially at the same time. Same lengthwise retention process essentially simultaneously produces the formation of an inwardly directed knurled area over the entire length. .

The total number of outward and inward I Aligned knurled areas together form the ring-shaped knurled strip, which either all at once or in stages can be trained.

The total area of the first arcs lying on the circumference is smaller than that covered by the second arcs. The first arches preferably cover a total of 10 to 20 % of the total circumference of this area of the cap that is to be occupied by the annular edge strip.

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The extension of the knurled areas directed outwards is like the extension of those directed inwards Knurled areas, preferably evenly over their lengths. The height of the outward Knurling elements preferably exceed the inwardly facing elements by about 0.102 to 0.152 cm (0.040 in up to 0.060 inch).

On the cover plate of the lid there is a central area, which is preferably essentially flat is and an annular outer area, which curves radially outward and downward and merges into the cover shell. The lower attachment point of the knurled strip on the cover shell is at one point on the upper one Half and preferably on the upper quarter of the cover shell. The strip extends substantially at first vertically upwards and then settles at least over a larger area of the annular outer area the cover plate away. The starting point of the knurled strip is in each case above the thread or serrated element. Of the The strip extends over the cover plate.

The shape of the outwardly directed knurled portions has a substantially V-shaped cross section, and the inwardly directed knurled areas preferably have shapes with essentially flat cross-sections.

The ring-shaped knurled strip also serves to stiffen and protect the bumps that are particularly exposed top & ante of the lid.

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- The invention thus provides a knurled cover with an improved, enlarged knurled area, which can be more easily grasped by hand to put on or remove the lid and a procedure for the production of this cover.

Y / eiterhin the invention provides a knurled twist-off cover, which is better suited to the Closing device detected and fastened to a container by means of a thread or with serrated elements will.

The invention also provides a method for producing a cover consisting of a piece of metal in front of with an outwardly formed knurled strip, that of the lid in terms of protection and rigidity gives where the cover plate merges into the cover jacket hanging down from it.

Further details of the invention will then be explained and described in more detail, with Reference is made to the accompanying drawings.

Fig. 1 is a perspective view of one according to the invention Embodiment of the lid.

Pig, Figure 2 is a partially sectioned side view of the lid of the invention.

Fig. 3 is a partially sectioned plan view of a lid according to the invention.

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Fig, k- is a partial section through a region of the lid from which the lid is made,

Fig. 5 shows an intermediate stage of the method according to the invention with a partially formed knurled element,

Fig. 6 shows another stage of the method according to the invention with a fully formed knurled element.

Fig. 7 is a partial section with both the cover shell as well as the molding tool resting against the cover plate.

Description of the preferred embodiments

The drawings are described in more detail below. In Fig. 1, a threaded cover 2 is provided with from a cover plate 6 depending coat ^ shown. In the form shown, the knurling elements set one annular knurled strips 8 in the upper area of the cover shell 4 and extend continuously above the top of the shell and up to the "cover plate 6, as shown in Figs in the knurled strips 8 outwardly directed knurled areas 1 ^, which are evenly around the circumference of the lid are attached distributed, namely alternating with the inwardly directed regions 16.

As shown in FIGS. 2 and 3, the outwardly directed knurled regions 14 produce a diameter D ₂ which is greater than the original diameter of the cap shell D ₁ . The inward ones

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Randel series 1.6 have a diameter D .., which is essentially the same size as the original diameter of the cap shell. The knurled structure therefore has a smallest diameter D ^ which corresponds approximately to that of the original cap and furthermore an enlarged diameter D _{2 is} provided which is large, r than that of the original lid. 7, a partial view of the cover in the molding tool, shows with full lines an inwardly directed knurled area and in dashed lines an outwardly directed knurled area. / The cover plate 6 has an annular outer area (denoted by the letter T), which surrounds the substantially flat central cover plate area. The annular outer region T has a shape that is curved downwards and radially outwards and ends at the bottom by merging into the cover jacket 4.

As shown in FIGS. 1 to 3 and 7, therefore, has an annular shape delimited by the knurled regions 14 and 16 Strips a lower shoulder on the upper half of the cover shell and extends continuously upwards at least the greater part of the annular outer region of the cover plate 6. The termination of the strip is located at the top of the cover plate 6. The strip extends vertically at its base above over the jacket 4 and then curves upwards and radially on the annular region T of the cover plate 6 inside. The stripe can certainly continue to the middle area of the Deok plate, but it is it is preferable to provide the end relatively close to the annular outer region T.

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In this way, the fact that the knurled areas 14, 16 extend over two surfaces of a relative Pull down a small area of the lid, a contiguous lid knurled area of limited dimensions provided that a capture of the lid facilitated by the locking device and grasping with the hand to remove the lid. Also will thereby created an annular reinforced area at the transition point of the cover plate 6 in the jacket 4, which gives the cover 2 an increased resistance.

The term "twist-off lid" used in this application refers to a lid with a continuous or discontinuous threads, prongs or other engaging protrusions to close the container, which require the application of torque to apply the lid to or from a container to decrease. It does not matter whether the protruding elements close the container before knurling while of the same or afterwards.

Referring now to Figure 4, there is shown a portion of a generally cylindrical shell of a cap, the dashed lines showing the outwardly curved knurled elements 14 to be formed and the inwardly directed inwardly directed knurled elements 16 therebetween which are shown in full lines. A number of first arcs A. lying on the circumference are essentially of the same size and alternately _{attached to the circumference with a number of second arcs A 2} lying on the circumference, which are also all approximately the same size. These arcs Aj, A ₂ ,

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which are shown on the jacket for a better understanding, extend upwards in the direction of the cover plate 6, to the end of the annular knurled strip. Within the arc A | lying on the circular arc is the metal for forming the element 14 with the height h. The sheet A ₂ , which is longer than the sheet A ₁ , contains the metal for forming the element 1.6.

With the method according to the invention, the outwardly directed knurled elements 14 are formed by shaping the arc A. up to the height h. This generally means expanding or thinning the metal on arch A ... To create the knurled area 14 on arch A ^, the entire area 14 can be formed by deforming the entire arch A «. are formed essentially simultaneously from the lower approach on the jacket 4 to the upper end on the cover plate region 6. The lower section of the knurled area 14 is located on the jacket 4 and is essentially ϊ vertically aligned, while the protruding upper area, which is designed as a continuous continuation of the lower area, extends upward and radially inward to the cover plate. The ring-shaped knurled strip is preferably applied to the upper quarter of the cover jacket at a point above the threaded elements on the cover.

The inwardly directed knurled areas 16 are formed essentially completely by a resistance movement of the sheet A ₂ during the formation of the areas 14. In this way, the regions 16 have a diameter D- substantially equal to the original cap diameter, and the regions 14 have one

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Diameter D ₂ , which corresponds to twice the height h of the areas 14.

With the method according to the invention, the larger element 16 is formed without substantial movement of the metal within the arc A ₂ . The smaller arc A ^ is merely formed radially outward to create the element 14. In this way, instead of the need _{to bend the large arch A 2} inward to make the edge

W delstreifen to give rise to 8, only the smaller arc A ₁ formed radially outward. The difference in length of the arches A ₁ , A ₂ is noticeable and it is easier to bend the smaller arch A. radially outward in order to form the smaller _{clement 14 than to bend the larger arch A 2} inward to form the element 16 to bend. By appropriately defining the lengths A ₁ , A, both the total number of elements 14, 16 and the height h of the element can be determined for each cover of a given diameter. The height h of the element 14 naturally determines the size difference between the diameter D ₁ and D ₂ . This difference can be changed slightly by the fact that A ₂ changes during the

™ stages of education can make a difference, but this is not essential.

An important feature of the invention is the possible change in the diameter D _{2 of} the outwardly directed knurled elements 14 with respect to the height h and the frequency and width of the elements 14, 16 on the circumference. The advantages according to the invention can be achieved if the sheet A _{2 is} larger than the sheet A ₁ , and in

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one advantageous arrangement is an overall expansion of the sheets A ₁ on the circumference over approximately 10 of the lid grommet · provided to 20% of the total circumference of the total extension of all arcs A ₂ on the circumference is then approximately 80 to 90 $ of the cover cap circumference. It follows that the outwardly directed knurled sections 14 have a size which can be easily formed, and in this way a desired section height h combined with a sufficient gap on the circumference between the adjacent sections 14 to be able to be gripped facilitate. The most advantageous outer height h of the hollow sections 14 with respect to the sections 16 is about 0.051 to 0.076 cm (0.020 to 0.030 inches), with the result that the diameter Dp is around a maximum of about 0.102 to 0.152 cm (0.040 to 0.060 inches) ) is larger than the diameter D-. The height h can change within the length of the knurled area 14, but will reach a maximum in the middle between the opposite ends.

The formation of the ring-shaped knurled strip 8 can take place in the manner shown in FIGS. On the inner molded part 20 there are lugs 22 which interact with depressions 26 on the outer molded part 24. Fig. 5 shows the forming process in the initial stage, while in Fig. 6 the elements 14, 16 have already been formed. In FIG. 5, the central nose 22 of the inner molded part 20 has begun to deform an outwardly directed knurled area. Areas of the molded part 24 rest on the adjacent sheets A ₂ in mutual surface contact, as a result of which an outward movement of the sheets A _{2 is} prevented. In Fig. 6 is the training of

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middle knurled area 14 essentially completed, while the adjacent areas are in the initial stage of formation.

7 shows a position of the molded parts in order to form the full longitudinal area of an individual element 14 or 16, to be precise simultaneously over the entire extent from the attachment on the jacket to the end on the cover plate. The end can be located within the annular outer area of the cover plate 6 or within its central area close to the area T. If anything, it only takes a little extra cleaning to widen the knurled strip in the direction of the center of the cover plate 6. The outer molded part 24 is provided with an extension 28 which consists of a curved transition point and a fleece which rests against the cover plate. The inner molded part 20 has a support surface 3 ^Ü for the cover plate. The extension 28 and the support surface 30 have regions corresponding to one another as a continuation of the noses 22 and depressions 26.

In this process to form a knurled strip by moving the metal outwardly with respect to the original cap, the upper extension serves 28 as additional resistance, which leads to an effective formation of a continuous knurling of the jacket and cover plate contributes. The outer molded part 24 therefore provides boundary surfaces that rest on the jacket and when training of the elements 16 prevent a radial expansion and through the extension 28 a deformation of the upper Prevent section of the elements 16 upwards.

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In the form shown, the range is 1 ^, such as e.g. the middle area in Figures 5 and 6, essentially trained at once. However, the neighboring arcs A are in a different state of formation * The formation of the annular knurled strip is therefore progressively made around the circumference of the lid. This process can either be carried out simultaneously by concurrent Shapes or can be made sequentially by roll forming. In general, however, a higher rate of production is achieved by forming at the same time. A progressive training by means of rolling molds can be carried out at increased speed, if Molds of sufficient size are used, the multiple outwardly facing elements 14 during a molding stage let arise at the same time. The use of forward moving rolling molds is granted also the distinct advantage that you are able to use the knurling process with the formation of threads or Combine prongs by continuous rolling and thus the need for an additional knurling process save.

As far as the knurl shape is concerned, the outwardly directed knurled portions 14 can have a suitable, generally V-shaped cross-section. The inwardly directed knurled portions 16 preferably have a planar cross-sectional shape. (In practice, the sections 16 consist of an arc A ₂ , the radius of which approximates that of the cover jacket; for the purpose of this description, however, this section is regarded as "generally flat".

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A problem that arises in feeding the lids into hoppers and grasping the lids prior to application is unwanted getting stuck or interlocking, which occurs when the cover plate penetrates into the opening of another cover. This often affects one proper feeding of the lids and requires a brief interruption in production. The inventive, after outwardly protruding knurled strips create an enlarged Lid cover plate, which has such a snag and in- ™ prevent other gripping.

The lid is preferably made from a unitary, deformable, substantially rigid cone, which can conveniently be made of a metal such as aluminum or tinplate.

It does not belong to the invention and is not shown in the illustrations for the sake of clarity, but is natural contemplated that the lid with a sealing element such as a washer, a ring, a inner cap or some other suitable shape k can be.

The ring-shaped knurled strip is reinforced ivanten structure created that the shock resistance of the lid is reinforced at this particularly exposed point.

Because the diameter D _{2 is} greater than the diameter D .., the lever arms are longer and in this way bring about a limited increase in the mechanical magnification

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Advantage when turning the end of the lid to remove the lid from
To remove or attach to the container. This advantage is achieved in a simple manner and without the need to use additional material for the cap.

It will be recognized, therefore, that the method and lid of this invention provide an economical means of providing improved knurling of the lid. Without the need for additional metal for the cap or workpiece, the cover shell
be provided with a protruding ring-shaped knurled strip with an enlarged diameter. This knurling can have a predetermined height h, which results from predetermined arc widths (A .., A ₂ ). The knurling can start in the upper half, preferably in the upper quarter of the jacket area and extend continuously up to over
extend the cover plate. The additional height of the knurled elements and the presence of them on both the mantle
as well as on the cover plate results in a knurled strip with a greater height difference between the sections
1 ^, 16 and an enlarged diameter Dp. This facilitates the manual or mechanical gripping of the lid with which a torque is exerted on the lid in order to put it on or to remove it. The increased diameter also increases the mechanical performance
the increased torque-lifting slopes increased. All of this is easily accomplished and a special lid of improved appearance and functionality is the result.

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Claims (1)

Claims 1.) Process for the production of a knurled container lid, in which a generally cylindrical cap is provided which has a cover plate and one of this depending ring-shaped jacket is characterized by the formation of a plurality continuous, outwardly directed knurled areas, each within a large number of first on the arc located arcs, which are all substantially the same size, by bending them first arches outwards in order to form in each of these knurled areas a lower portion which extends from the annular Cover jacket extends radially outward, up to a diameter that is greater than the original Diameter of the jacket is, and to form an upper section which connects to the lower section, and extends upwardly and outwardly from the cover plate; and by forming a plurality of consecutive ones, inward directed knurled areas, each of which lies within a large number of second arcs lying on the circular arc, all have essentially the same size and are arranged alternately with the first arcs on the circumference, by restraining these second arcs from flexing outward during the formation of the outward ones Knurled areas, the lower portions of the outwardly and inwardly directed knurled areas can be formed on the upper half of the depending annular shell. 2. The method according to claim 1, gekennzeich-.n e t by forming the outwardly directed edge1- 009838/1607 " ¹ ^ - areas by thinning outward shaping of the first arcs, the first arcs on the arcs taking up about 10 to 20 # of the total circumference of the cap jib area on which the knurling is to be formed, and the second arcs on the arcs about 80 to 90 Fo of the entire circumference of the lid cap area, on which the knurling is formed, and by forming an inwardly directed thread on the lid shell. 3 «Method according to claim 1 or 2, -ge code Inet by successively forming the outwardly and inwardly directed knurled areas around the circumference of said cap, by essentially simultaneous formation of the individual knurled areas to their finished shape, forming the individual outwardly directed knurled areas into one over the Overall length of essentially uniform expansion, and formation of the individual inwardly directed knurled areas to an essentially uniform one over the entire length Expansion. ** · Method according to one of claims 1 to 3, identified by forming the outwardly directed, knurled areas with alternating height and one Maximum height of approximately 0.102 to 0.152 cm (0.0 ^ 0 to 0.06ο inch), which is reached in the middle between the ends of the knurled areas facing outwards. 5. Method according to one of the preceding claims, marked by the training of the individual outwardly and inwardly directed knurled areas, the approach of which lies on the upper quarter of the cap, and -20- 009838/1607 continued shaping of the individual knurled areas directed outwards and inwards following the approach, directed vertically upwards and merging into a curved area directed upwards and radially inwards, which ends at the top step of the knurled areas, 6, method according to one of the preceding claims, marked by bending the first individual arcs on the arc of a circle into a generally V-shaped cross-sectional shape, t and at the same time holding back the second on the arc lying arcs, which are arranged immediately next to the first arcs lying on the circumference, namely against an outward movement and forming the naph outwardly directed knurled areas that are shorter than have the inward-facing areas. 7. Twistable container lid, which is produced according to the method according to claim 1 and has a cover plate, which has a central cover plate area and a circular curved outer cover plate area, the is arranged radially outside of the central cover plate area and extends downwards and radially outwards ^ extends, as well as one of the said annular, ring-shaped jacket area, characterized by the curved outer cover plate area by an annular knurled strip (8) with alternating on the circular arc, either protruding and after outwardly directed hollow knurled areas (14) or inwardly directed knurled areas (16); its lower approach on the upper half of the ring-shaped Mantefe (4 ·) and is continuously up at least one -21- 009838/1607 the larger portion of the annular curved outer cover plate portion extends; which has a lower portion which extends ^{substantially vertically upward from this 1} approach, and an upper portion which extends from the lower portion upwards and radially inwardly curved to an end at the uppermost region of the strip, wherein the outwardly directed knurled areas (14) occupy essentially equally long circular arc sections (A |), the inwardly directed knurled areas (16) also _{occupy essentially equally long circular arc sections (A 2} ), and the outwardly directed knurled areas (14) in cross section are generally V-shaped. 8, container lid according to claim 7, characterized in that g e mark I net that the middle cover plate area of the cover plate (6) is essentially flat and the ring-shaped knurled strip (8) begins at the more frequent quarter of the ring-shaped jacket (4) and in the vicinity of the outermost edge of the middle cover plate area ends, as well as in that the inwardly directed knurled sections (16) have substantially planar cross-sectional shapes. 9. Container lid according to claim 7 or 8, characterized in that the lid (2) has a has a uniform shape made of metal and has inwardly directed threads on the cover shell (4) are located and that the annular knurled strip (8) is arranged above the thread. -22- 009838/1607 10. Container lid according to claim 9, characterized in that the metal is aluminum, and the diameter (Dp) of the annular jacket (4) on the outwardly directed knurled regions (14) is greater than the diameter (D ^) of the annular jacket al the inwardly directed knurled areas (16), namely by a maximum
from about 0.102 to 0.152 cm (0.040 to 0.060 inches). 009838/1607 L e β r s e i t e