Tamper evident closure

A closing method detects an attempt to open containers illegally

Full description

Background of the invention

The present invention relates to means for closing containers with a spiral neck that tapers externally. More specifically, the invention relates to means of closing that are configured to provide a collar to detect an attempt to open the container illegally.

One of the matters that manufacturers of food, beverages, medicines, dental cleaning products, and the like are concerned with is ensuring that their products that are placed on the market are not subject to an attempt at illegal opening before those products are opened by the final consumer of the goods. For this purpose, it has become traditional for the means of closing these goods to include a tool that indicates that there have been attempts to open them illegally before purchase. In the case of containers that have a spiral neck that tapers externally, it is common for their lids to be equipped with a collar to detect attempts to open, and this lid is attached behind a retaining lip formed on the neck of the container. The collar that detects opening attempts is connected to the part forming the edge of the closing device through a number of breakable bridges. When the closure device is placed on the container, the collar is pushed above the retaining lip, but if the closure device is not threaded to exit the container, the bridges are cut when the collar is retained behind the retaining lip, as the closure device moves up to the neck of the container.

Although these collars, which are used to detect attempts to open containers illegally (forcibly), have gained widespread acceptance, there is a delicate balance between two conflicting needs. On the one hand, a person must have the ability to place closing devices on containers at a very high speed without breaking the bridges, or without the collars themselves being broken or deformed.

Or without harmfully affecting the tight seal between the lid and the container. On the other hand, the collar must be effectively secured behind the retaining lip and bridges, and/or the collar must be easily cut so that the lid cannot be dislodged from the container without having to tear off the bridges and/or collar.

Another problem is that an unauthorized person may attempt to remove the closure and opening detection collar without damaging the collar or breakable bridges, in order to contaminate or replace the contents of the container, and then put the closure back in place. This attempt may be made with the help of a precise tool, such as a knife blade, when inserted between the illegal opening detection collar and the neck of the container on which the closing device is placed. The tools may then be lifted up to extend the inner diameter of the collar so that it can pass back through the retaining lip of the container. In this process, the tool is shaped peripherally around the circumference of the collar so that it gradually facilitates its wrapping around the diaphragm lip at a part of the circumference of the collar that extends continuously.

Closures of the type mentioned above are used all over the world in very large quantities. To be commercially acceptable, these closures must be capable of being produced at high rates in automated machines, and this in itself may interfere with the functionality of the closure and/or collar used to detect illicit opening attempts. Therefore, the modifications according to the present invention are designed to provide an alternative form of a closing device containing a collar to detect illegal opening attempts.

General description of the invention

In its broadest aspect, the present invention consists of a container closure device including an externally screw threaded neck. The closing device includes a top and a flange containing at its inner surface a complementary screw thread

About attempts at illegal conquest. The collar consists of a cylindrical body and a segmented rib extending into the body and adjusting to provide a flange that connects below the retaining lip and extends outside the neck of the container down a spiral groove therein. The rib has an upper side facing away from the upper part of the closure, with an underside facing away from the upper part. The structure is finished with ridges or other localized areas to increase thickness and enhance the rigidity of the structure while allowing it to expand radially when pushed over the retaining lip on the container.

In a preferable first aspect, this invention consists of a means of closing a container that has an external toothed screw neck. The closing device contains an upper part and an edge, on the inner surface of which is a complementary screw thread. The end of this edge is connected by a group of breakable bridges with a collar.

To detect illegal opening attempts. The collar includes a cylindrical structure and a segmented rib that extends internally into the structure and is adapted to provide a flange that connects below the retaining flange and extends outside the neck of the container below the thread thereon. The rib has an upper side facing the top of the closure device, with an underside facing away from the top. The closure means is characterized by the upper side of the rib containing a first surface that communicates with the collar structure, the surface of which slopes inward and downward, with a second surface located radially inward from the first surface. The second surface has a slope angle, which is closer to the position perpendicular to the longitudinal axis of the closure device compared to the position of the first surface slope angle relative to this.

the hub.

In the closure means of the previous invention, the upper side of the rib is always linear in cross section. The upper side was located either in a plane perpendicular to the longitudinal axis of the closure device, or the surface was in the form of a simple frusto-conical ellipse inclined to that axis. In the first case, there was difficulty in molding the upper side, as it is perpendicular to the direction in which the core of the mold must be drawn from the lid. In the latter case there was greater possibility of pushing the rib above the lip on the neck of the container. He was treated

The present invention solves these problems by providing an upper side of the rib with a steeper compound surface at a radial angle at its outer surface, which aids in molding the rib. Here, it is preferable that the installed surface be provided with a radial inner surface in a position perpendicular to the longitudinal axis of the closing device, to increase the difficulty of removing the lid in an intact condition from the container. Preferably, there should be a relatively clearly distinct connection located between the first and second surfaces on the upper side of the rib. However, the two surfaces may gradually merge with each other so that the upper side of the rib has a generally arched cross-section. It has been found that in this way the resistance to removing the sealing device from the container can be increased, while facilitating the molding of the sealing device. This last aspect is important for economic reasons, as it is necessary for the closing devices and their accompanying collars to detect opening attempts to be capable of molding at very high rates. It is preferable that the first flat on the upper side of the rib represents from 25 to 75; , preferably 5 4 - 55% of the radial width of the upper side of the rib. It is also preferable for the first surface to have a slope angle of a vertical plane relative to the longitudinal axis of the launching means, and for the value of this angle to range between 10 to 60, the best is between 12 to 40 degrees, and the most preferable is between 15 to 25. As for the second bare surface on the upper side of the rib, it is preferable to represent 75 to 25%, and preferably 55 to 45% of the radial width of the upper side of the rib. It is also preferable for the second surface to be located in a vertical plane with respect to the longitudinal axis of the closing device, or at an angle of up to 10 degrees relative to this plane, and it is most preferable for it to be located in this plane.

When applying the present invention it is found that during injection molding of closing means from an injection mold defining a side having an upper side including a first annular surface and a second annular surface, the clear distinction between the first and second surfaces may be lost when observed with the naked eye, or at least be difficult to perceive in the product. The close one. It is believed that this is due to the second annular surface being deflected and sliding to a deflection angle similar to that of the first surface when the closing device is ejected.

From the template. Despite this unusual phenomenon in which the mold displays the two surfaces without the molded closing device displaying them, it has been found that the closing devices molded with such a mold exhibit a higher degree of resistance to unauthorized opening compared to similar closing devices that are molded in a mold that does not define the upper side of the The side as having first and second surfaces.

In another aspect, the present invention includes a means of closing a container with a neck with an external screw thread. The closing means here includes an upper part and a rim containing at its outer surface a complementary screw thread, in which the exposed end of the rim is connected by breakable bridges with a collar to detect attempts at illegal opening. The collar has a cylindrical and rib structure

A collar to detect illegal opening attempts. The gasket has a cylindrical structure and a segmented rib extending internally into the structure and adjusting to provide a flange that connects below the diaphragm flange extending outside the neck of the container below the thread thereon. The rib has an upper side facing the top of the closure device, with a lower side facing away from the top. The closure means is characterized by the fact that it is formed by injection molding from an industrial plastic material in a mold that defines the upper side of the rib, which contains the first surface in contact with the collar structure. The aforementioned surface slopes inward and downward from the top, with a second surface positioned so that it lies radially inward from the first surface. The second surface has a slope angle closer to the longitudinal axis of the closing device compared to the angle of the first surface with this axis. It is preferable that the surface of the mold have the features previously described as preferable to the upper side of the rib itself. In another aspect of the invention, the surface of the collar entering radially is provided with a row of protrusions extending internally, which are spaced radially apart and located between the rib and the free end of the collar. If desired, the protrusions, or some of them, can be made to contact the underside of the rib by intersecting with the longitudinal width of the collar, or they can be placed a short distance from the lower free edge of the collar. The ridges may preferably be aligned parallel to the longitudinal release of the closure device, but the ridges may also be inclined on the axis. That existence

These inwardly extending protrusions make it difficult for a person to intentionally attempt to expand the diameter of the road and facilitate its safe exit from the neck of the container by inserting a blade or other tool between the collar and the container.

Particularly preferably, in this invention the segmented rib contains alternating ridges located below the space between the rib segments, and most preferably, at the bottom of the midpoints of the underside of the rib segments, said ridges are adjacent to the underside of the rib segments. It is preferable for the protrusions to incline radially inward as they approach the rib. However, it is not preferable for the protrusions to extend inward from the radial inner surface of the collar structure at the same distance to which the rib extends. It is preferable that the protrusions extend radially inward, so that they do not extend beyond the first surface of the upper side of the rib. As for the rib formed for the purpose of connecting with the diaphragm lip on the container, when it is divided around the collar, it remains extended around the greater side of the circumferential expansion of the inner surface of the collar. It is preferable for the rib parts to be spaced equal distances from each other around the inner perimeter

For the collar, it should occupy at least 50%, preferably 65% of the collar, and most preferably at least 80% of the inner circumference of the collar. It is also preferable for the rib to have a wide base at which it connects to the collar structure.

It is preferable that each of the rib parts be formed such that they are provided with two serrated end surfaces that are inclined to the axis of the closure device and directed away from the top of the closure device, i.e. in the direction in which the axis of the mold used in molding the closure device is pulled. It is also preferable for the flat end surfaces of the closing device to be inclined down to the corresponding part of the rib, so that the end ends are inclined towards the edge of the closing device at an angle less than that located between the corresponding plane and the end edge.

It is preferable for a collar to detect opening attempts to also provide areas of local thickness extending externally from the outer surface of the collar structure. It is also preferable that these thickness zones extend parallel to the longitudinal axis of the closing device across the longitudinal width of the collar. The outer thickness areas work to support and strengthen the above detection when opening the container illegally. Preferably, the collar support here serves to enhance the vertical rigidity of the collar, while maintaining a sufficient degree of flexibility to facilitate placement of the closure device on the container. This support also allows sufficient axial forces to be directed at the end end of the collar so that the closure device can be successfully extruded. The collar support also helps reduce the possibility of unauthorized opening of the closure device, and reduces the possibility of the collar stretching so that it can easily be retracted above the retaining lip on the container in which the closure device is placed. It is preferable for the bridges to be spaced equal distances apart around the perimeter of the closure device, but these bridges can optionally be arranged in two groups facing each other diagonally. It is preferable for each group to occupy from a quarter to a third of the circumference of the closing device, while the spaces between the two groups occupy from a quarter to a sixth of that circumference. It is preferable that each group of bridges contain 4 to 10 bridges spaced at equal distances within the group.

The bridges in each group may have an axis parallel to the axis of the closing means, but it is preferable that the axis of each bridge be inclined to the axis of the closing means, and it is better for this tilt to occur so that when viewed in an enlarged profile, the upper end end of the bridge is inclined to the left relative to Lower terminal end. This is a particularly favorable arrangement and is confirmed by the fact that most screw gears are in tension in the direction of rotation of the clock hand. The preferred inclination of the bridges allows them to flex when the closure device is threaded into the container, which stabilizes the collar and reduces the possibility of it tearing or the bridges breaking or deflecting during use. In contrast, this preferred tendency for bridges means that when...

The closure means is not threaded, and the bridges are straight, which works to concentrate the forces that tend to cause a tear in the bridge at its point of contact with the collar and the end edge. It is preferable that the tooth on the inner surface of the edge of the closing device be formed from a group of toothed parts arranged starting from the part of the first tooth located behind the apex along a helical position of the tooth. It is preferable that each of the parts of the tooth - except for the first tooth - be formed so that it contains two flat end surfaces that are inclined to the axis of the closing basket and facing away from its apex, that is, in the direction in which the axis of the die used to mold the closing means is pulled. The term “substantially level surface” means a surface that is actually flat or is curved so that it faces entirely in the distinct direction. It is preferable for the first tooth part to taper at its distal end towards the adjacent tooth part to thus assist in coupling the notch with the closure means by means of a corresponding notch located on the neck of the container. It is also preferable for the flat end ends of the tooth parts to be inclined relative to the radial planes in the closure device, which extend from the longitudinal axis of the device down to the end end relative to the cylindrical edge at an angle limited to the angle between the corresponding radial plane and the end edge.

To help the gas escape between the parts of the tooth, the spaces between the parts are aligned here in the adjacent courses of the tooth. A groove may develop on the inner surface of the end edge of the closing device, which extends longitudinally through the aligned spaces.

In another embodiment, the present invention consists of an injection-molded material comprising a cylindrical wall with a tooth formed at its inner surface and consisting of a group of parts arranged at spaced intervals along the helical position of the tooth. There are at least some portions of the tooth terminating at at least one end of a flat surface that is inclined relative to the axis of the tooth and faces the direction in which the axis of the die used to mold the material is drawn.

It is preferable that the closing device be shaped so that it contains a device for a tight connection with the container to prevent leakage. Any of several known alternative sealing arrangements may be used herein with the sealing device of the present invention, including integral sealing ribs, protruding flanges, gaskets, or internal flow sealing gaskets. The sealing devices preferably include an annular sealing rib protruding downward from the underside of the top of the sealing device. The rib includes a first part with an internal cylindrical surface in contact with the apex and located near the terminal edge, with a second part in the form of a frusto-conical cone in contact with the terminal end of the first part far from the apex and extending radially inward to end at the free annular edge. The first part has an internal diameter that is at least equal to the outer diameter of the neck of the container to which the closure device is attached, so that during the connection by means of the screw thread of the closure device with the neck, the second part, formed in the form of a frusto-conical cone, is connected with the free terminal end of the neck, then It is folded back towards the cylindrical inner surface of the first part of the rib, creating a sealing device that does not allow gases to pass between the outer surface of the container neck and the closing device. It is preferable that the closing device contain a cylindrical edge, in order to carry on its inner surface a group of fine vertical ribs that end at the lower end of the edge within a narrow-circumference rib. It is preferable for the fracture bridges to be more precise in their radial geometric dimensions compared to the peripheral edge, and for the collar and the inner surface of the bridges to be located at the level of the radial inner surfaces corresponding to both the peripheral edge and the collar. The diameter of the outer surface of the collar is slightly smaller compared to the diameter of the peripheral rim, but with the exception of localized areas of thickness that protrude radially outward beyond the radial extension of the peripheral rim.

In this model, with regard to the inner surface of the peripheral edge, it is preferable that this surface be generally cylindrical, with a spiral row of serrated spiral parts extending radially across it.

inside that surface. The parts of the screw are separated from each other by axially aligned spaces. It is preferable that the inner part of the collar be defined by a smooth upper cylindrical surface located above the rib with a diameter similar to the diameter of the inner surface of the end edge. It is also preferable for the rib to be shaped so that its parts are in axial alignment with the parts of the screw thread located on the inner surface of the end edge, and so that the spaces between the parts of the rib are in axial alignment with the spaces between the parts of the screw. At the bottom of the rib, the inner surface of the collar tilts downward and outward, so that the collar is less thick at its lower end compared to the thickness at its upper end. This inclined surface bears a row of protrusions that are aligned axially and whose thickness is less than the thickness of the rib parts. The mutual protrusions are adjacent at their upper end towards a central point of one of the parts of the rib, while each of the other protrusions aligns with one of the spaces between the parts of the rib.

Brief explanation of tags

To better embody this invention based on the attached figures and drawings, which are as follows:

Figure 1: A side diagonal section of one embodiment of the closure device according to this invention. Figure 2: A section along sector 2-2 in the closure device shown in Figure 1.

Figure 3: A section along sector 3-3 of the closure device shown in Figure 1.

Figure 4: A section along sector 4-4 in the closure device shown in Figure 1.

Figure 5: A section along sector 5-5 in the closure device shown in Figure 1.

Figure 6: A section along sector 6-6 in Figure 4.

Figure 7: A section along sector 7-7in Figure 4.

Figure 8: Enlarged side view of the closing device in Figure 1 when viewed in the direction of the arrow &A&

In Figure 3.

Figure 9: Enlarged side view of the closing device in Figure 1 when viewed in the direction of the arrow &B&

In Figure 3.

Figure 10: A longitudinal cross-section of another model of the closure device, enlarged. Here it shows the closure device relative to the neck of the container when the closure device is screwed into the container. Figure 11: A longitudinal cross-section of the closure device shown in Figure 10. Here, the closure device is tightly connected to the neck of the container.

Figure 12: A side vertical section of a part of the mold used in the injection molding process for closures according to the present invention, with the rib definition area shown here in an enlarged form.

Detailed description:

The closure device that detects attempts to open the container (10) includes an attached collar to detect attempts to open the container (11), and this collar has a generally cylindrical structure (12) connected by breakable bridges (13) to the lid (14) that provides the closure device ( 10). The cover (14), breakable bridges (13) and opening detection collar (11) are all individually formed by injection molding from a suitable material such as polyethylene or polypropylene. The cover (14) includes a circular top (15) and a rim (16). At the inner surface of the end flange (16) there is a tapered screw adapted for connection with containers commonly made of glass or plastic materials such as poly(ethyleneterephthalate (PET)) equipped with an external threaded screw holder. For container 29 (partially illustrated in Figures 10, 11), to which the closure device (10) is attached, here includes a continuous diaphragm flange (30) located immediately below the tooth.

The spiral (31) of the container (29) with the flange facing upward diagonally. The collar (11) includes a rib (18) located around the inner surface of the collar and its size and shape are adjusted so that it forms a lip that extends inward and connects with the lower part of the diaphragm lip (30) in the container (29) once the closure device (10) is in place. Completely on the container

(٢٩).

Rib (18) is made from a group of parts (19) that are separated from each other by short spacers (20). However, these parts represent about 85% of the circumference of the collar and work with each other despite the fact that rib (18) is largely connected. These spacers (20) provide circumferential flexibility to the collar. It allows the rib (18) to pass through the retaining flange (30) without sufficient stress to break the breakable sockets.

Side (18) contains an upper side (21) that points toward the apex (15), with a lower side (22) that points away from it. The upper side (21) includes an outer frusto-conical surface (23) and an inner annular surface (24). The annular surface (24) is located in the vertical plane relative to the longitudinal axis of the closing device (10), while the frusto-conical surface (23) tilts inward and downward away from the upper part (15), thus forming an angle of 20 degrees with the plane. Vertical relative to the longitudinal axis of the closing device. The outer frusto-conical surface (23) and the inner annular surface (24) each comprise about half the diagonal width of the upper surface of the rib (18). When used, the annular surface (24) connects with the lower part of the flange (30) at the neck of the container (29), to which the closure device (10) is attached. The presence of the frusto-conical surface (23) helps in molding the closure device (10), as its presence prevents, or at least greatly reduces, the production of closure devices with deformed ribs (18). The presence of this surface also ensures the rigidity of the rib (18), preventing deflection when it is pushed above the retaining flange (30) while screwing the closure device (10) into the container (29).

The rib (18) is characterized by a sufficient degree of strength that enables it to withstand the forces applied to it when placed on the container (29), and it also prevents the removal of the cover (14) without destroying the breakable bridges (13) whether by normal removal of the cover (14) or as a result of illegal attempts. To open the container (29). It has been found that no harmful effects result if the annular surface (24) does not extend across the entire width of the upper surface (21) of the rib (18).

At the bottom of the rib (18) and on the inner surface of the structure (12) in the ways (11), there is a group of protrusions extending internally (25, 28). These protrusions have a longitudinal axis that aligns with the longitudinal axis of the closing means (10). The protrusions (25, 28) extend radially inward from the inner surface of the body (12) until sufficiently reaching the contact position of the retaining flange (30) while placing the closure device (10) on the container (29) once the container is capped and located close to From the outer surface of the container neck (29). Both the mutual and internally extending ridges (28) are located below the interval (20) in a largely continuous side (18) without connecting to the side (18). As for the remaining protrusions extending internally (25), they connect at one of the terminal ends with the rib (19).

The radial inner free edge of each of the rib parts (19) protrudes inward, reaching a sufficient distance beyond the maximum internal extension of the protrusions (25, 28), and here the protrusion must be stable enough to be self-supporting while placing the closure device (10). On the container (29), and to prevent the collar (11) from sliding above the retaining flange (30). The ridges (25, 28) prevent a person from inserting an object such as a knife blade into the frame (12).

The collar (11) attempts to raise the rib (8 1) above the lip (30) associated with it on the container (29). Along the outer surface of the collar (11) there are a number of support parts or thickening parts (6 2), each of which extends from an area adjacent to the level of the rib (18) to an area located at the free terminal end of the collar (11). The thickening parts (26) work in conjunction with the extending protrusions

Internally (25, 28) to strengthen the collar (11) and enhance its vertical rigidity, while maintaining a sufficient degree of horizontal, radial or radial flexibility. This also allows effective axial forces to be directed at the free end end of the closure device (10) so that the closure device (10) can be successfully projected from the axial portion of the die used to produce it. The outer surfaces of the thick parts (26) represent flat lands (27) located directly and radially outside the radial extension of the closing means (10), such that this allows the base to be mechanically gripped or in contact without the need for contact with the end flange. The closure device (10) is configured to have a sealing device having a concentric annular rib (32) extending from the underside of the top (15) in the cover (14). The annular rib includes an initial part or root (33) that extends downward from the apex (15) approximately to the terminal edge (16), with a second part (34) that tapers inward and away from the terminal edge (16), before connecting with the neck of the container ( 29).

The second part (34) of the rib (32) comes into contact with the terminal end (35) of the container (29) when the closing device (10) is screwed into the container (29), then the second part (34) is allowed to bend on the surface of the first part (33). . Thus, a gas-tight seal is formed between the closing device (10) and the container (29), and this extends up to the side wall (36) of the container (29) to the terminal end (35) of the container (29).

As the closure device (10) is screwed into the neck of the container (29), the shape of the second part (34) of the sealing rib (32) changes, as it bends towards the top (15). This change in shape continues and contact occurs between the second part (34) and the inner rib (37) on the inner surface of the crest (15). In fact, the internal rib is not necessary in the invention and can be dispensed with if there is a desire for it.

As soon as the second part (34) comes into contact with the top (15), another movement occurs that leads to the closing device (10) connecting and holding the second part (34) between the terminal end of the container (35) and the top (15). As the movement leading to the connection of the closing device (10) continues, it tends here to narrow the free edge of the rib (32) between the container (29) and the upper part (15), and to attract the first part (33) of the annular rib (32) strongly towards the terminal end. of the container (35) to produce a tight seal around the curved end surface of the container (29) which extends from the extreme end annular surface (35) down the side wall (36).

As the closing device (10) is screwed into the neck of the container (29), the thread (31) is also connected to the thread (39) located on the inner surface of the custom flange (16). When the closure device (10) moves down the neck of the container (29), the fragile bridges (13) create a weak annular area that allows diagonal expansion of the rib (18) on the retaining flange (30) in the container (29).

In this model, the breakable bridges are separated from each other by equal distances around the circumference of the closure device (10), and the axis of each of the breakable bridges (13) is inclined so that when viewed from a magnified side, the upper end of each bridge (13) is tilted to the left in proportion. to its lower terminal end. Therefore, a turn of the bridges (13) occurs when the closing device (10) is screwed in the direction of rotation of the clock hand in the container (29). With the extension of the rib (18) on the lip (30), both the lower edge (42) of the tip (16) and the upper edge (41) of the collar (11) have a space to relax towards each other while maintaining the bridges (13) between them. This stabilizes the collar (11) and reduces the possibility of bridge breakage (13) during use. Once the rib (18) passes under the lip (30) and is attached to it, the frangible bridges (13) return to their expanded position (Figure 11). When the closing device (10) begins to release from the screw position of the container neck (29), the rib (18) traps the collar (11) under the lip (30). As the closing screw (10) is released, the bridges become in a straight position, and this leads to...

To concentrate the forces that pass through the bridges (13) at the point where each bridge (13) connects with the collar (11) and with the end edge (16).

As clearly shown in Figure 1, inside the edge there are (16) teeth prepared from a group of serrated spiral parts (51) arranged in a row spaced along the groove site. Each filamentous segment, except the first segment (52), is bent at each terminal end by a flat surface (53). Each of the plane surfaces (53) is inclined on the longitudinal axis of the closing device (10) up to the relevant plane surface (53), such that the minimum angle between the plane surface (53) and the end edge (16) is acute and less than the angle between the plane Radial and terminal edge (16).

The first thread part (52) consists of a flat surface (53) located on the back edge, but it consists of a point (54) located on its front edge to assist in coupling the notch with the closing device (10) by means of a counterpart located on the neck of the container (29). ). In each coil of the thread, serrated spiral parts (51) are lined up, just as the spaces separating them are lined up. A groove (43) is formed on the inner surface of the terminal edge (16) in each of the spaces aligned between adjacent serrated spiral parts (51). The grooves (43) help gases escape from the carbonated drinks container when the closing device (10) is not threaded.

The end faces of each part of the rib (18) are located in an angular shape, and this was described in reference to spiral-toothed parts. This reduces the possibility of rib parts (19) breaking when the closing device (10) is extruded from the die.

The closing device (10) is molded along the axis of the mold which marks, among other things, the inner surface of the end flange (16), the threaded spiral parts (51) and the grooves (43). It was found that by forming spiral-toothed parts (51) on flat surfaces (53), the amount of

The damage occurring in the groove parts (51) when the closing device (10) is advanced from the die axis, compared to the damage occurring when each of the threaded spiral parts is formed with a pointed end similar to the point (54).

Figure 12 shows that part of the mold (44) used in molding the rib parts (19). We see here that the template distinguishes a corresponding crack or cavity (45) in terms of its cross-sectional shape

For the required slope in the rib parts (19), which is divided into a first outer surface (47) and a surface

Second internal (48). The first surface (47) is in contact with the cylindrical surface (49) of the mold, which is the surface that here distinguishes an inner surface of the collar (11). This first surface (47) is inclined to the vertical plane of the mold axis at an angle of 20 degrees. The second surface 48 is located in a plane perpendicular to the die axis.

These people who are experienced in this field realize that there are many variations and/or modifications that can be made to the invention according to the specific embodiments, without deviating from the content and scope of the invention as comprehensively described. Therefore, the current models in all their aspects are considered illustrative models and are not exhaustive or specific.