EP4053047A1 - Noise-damping waste container, lid and method for manufacturing a lid - Google Patents

Abstract

The invention proposes a waste container with two components made of plastic, which are designed as a trough, pot or cup-shaped container and as a lid (1), and with damping elements, each designed as a buffer (4) that is attached to the container or is molded onto the cover (1), the component which is provided with the buffers (4) consists. The invention also proposes a lid (1) of such a waste container and a method for producing a noise-dampened lid (1) of such a waste container.

Description

The invention relates to a soundproof waste bin and a soundproof lid which can be used to create a soundproof waste bin.

Especially in the case of waste containers, for example with cup-shaped containers whose height is greater than their cross-sectional dimensions in terms of width and depth of the container, it is known from practice that these waste containers are closed with lids that are pivoted on the container and when closed impact with gravity on an upper edge or collar of the container. In particular when the container is empty, the container acts as a resonance space, so that the opening of the lid can be clearly heard acoustically. This can possibly impair the living quality of residents, particularly depending on the respective time of day and possibly also the season, if, for example, real noise pollution can result from the handling of several waste containers through an open window.

For example, it may be in the municipal interest to avoid traffic jams in residential areas with comparatively narrow streets and use garbage trucks to empty the waste containers in the late evening hours or in the very early hours of the morning to allow traffic to enter the residential areas. In particular, if the garbage trucks are electrically powered, this can in principle be done without any disruptive acoustic effort. In this case, however, care must be taken to ensure that the waste bins themselves are not acoustically disturbing.

It is therefore known from practice to use noise-insulated lids for waste containers. It is known that a cover made of a first material is provided and a plurality of buffers made of a second material, which is softer than the first material, are attached to the underside of the cover. For example, the buffers can be fixed mechanically, e.g., screwed into corresponding holders on the underside of the cover, or they can have a U-shaped cross-section and be pushed onto ribs located on the underside of the cover.

From the FR 2 884 236 A1 a waste container is known in which damping elements are arranged on the lid to dampen noise when the lid is closed.

From the DE 3517 723 A1 a garbage can with sound insulation is known in which noise-damping, for example, rubber-like buffer elements are attached to any contact or proximity points between the lid and body, which dampen the impact noise when opening and closing the lid or avoid the lid impact by braking the lid movement.

From the DE 202 04 062 U1 a lid damper for garbage cans with a flat lid is known, in which a rubber damper has a thread and is screwed into a hole in the edge of the can.

The invention is based on the object of improving a generic waste container in such a way that it is provided with an acoustically effective noise damping of the lid closure that is as cost-effective as possible. Furthermore, the invention is based on the object of specifying a lid that enables the creation of such a waste container, as well as specifying a method for the economical production of such a lid.

This object is achieved by a waste container having the features of claim 1 and by a lid according to claim 9 and a method according to claim 12. Advantageous configurations are described in the dependent claims.

In other words, the invention proposes that the buffers be molded directly onto the lid or onto the container of the waste container in an injection molding process. The invention is described below in particular with reference to a noise-dampening design of the cover, because noise-insulated waste containers can be created by inexpensive retrofitting of existing waste containers with covers according to the invention, simply by replacing the cover.

The injection molding creates an intimate connection between the buffer and the respective component of the waste container, so that the buffer ultimately becomes part of the lid or the container of the waste container. Therefore, within the scope of the present proposal, a distinction is made between a “main body” of the lid or container on the one hand and the buffer on the other, with the respective main body and buffer then forming the lid or container together.

According to the invention, it is provided that the buffers consist of a material that is softer than the material of the respective main body. This results in a particularly effective noise reduction achieved, compared with the possibility of using a special shape to form springy elements directly from the material used for the main body onto the respective component - namely onto the lid or onto the container, which are intended to serve as damping elements.

Because, according to the invention, the damping elements are molded onto the main body of the lid or container, a significant economic advantage is achieved compared to initially producing the damping elements as separate components, which are then handled, stored, provided and attached separately to the lid or container have to be mounted. Advantageously, the main body of the cover can be injection molded from a plastic material and the buffers can be molded onto the main body while the main body is still in the injection mold used to manufacture it. This two-component injection molding process is economically advantageous because the complete cover can be manufactured in a single operation and the main body does not have to be specially handled to attach the buffers.

To enable the mentioned two-component injection molding process, it can be provided that a movable slide arranged in the injection mold, which is also referred to as a core puller, is first moved into a first position in which the slide closes the mold cavity of the lid during production of the lid limited lid, and that the slide is withdrawn after the manufacture of the lid to a second position remote from the lid, such that a cavity is created between the lid and the retracted slide, which forms a buffer mold cavity, and that in this buffer -Mold cavity where the second material is injected. In this context, when the method for producing the lid is described, the “lid” is also already the one consisting of the first material designates the main body of the entire lid, which is then provided with the buffers to finally form the entire sound-proof lid consisting of the main body and buffers.

In one embodiment of the method, the slide mentioned can have a projection which passes through the mold cavity of the cover when the slide is in its first position. During manufacture of the cover, this projection is injection-moulded all around by the first material, but not on the end face of the projection, so that a hole is subsequently produced in the cover through this projection, in that the slide is pulled back into its second position. In this way, the second material can be supplied from the opposite side of the lid, ie from what will later be the outside or top side of the lid, in order to form a buffer on what will later be the inside or bottom side of the lid. This enables greater design freedom in the design of the cover or its injection mold, since the second material does not necessarily have to be brought up to the cover that was produced first from below.

The projection on the slider also advantageously protrudes into the buffer mold cavity when the slider is in its second position, so that the buffer is at least partially ring-shaped, advantageously in its lower area, where it comes into contact with the container when the lid of the waste container is closed. The ring-shaped design of the buffer in this contact area means that the lid hits the container particularly gently, and thus a particularly low level of noise development. Second, it is economically advantageous to minimize the amount of the second material. Thirdly, in favor of the shortest possible cycle times, the cooling of the second material is supported in that a large mass of material is avoided and instead an optimally fast heat transport from the second material to the surrounding injection mold is supported.

In one embodiment of the method, an injection mold is used which, on the side facing away from the slide, adjacent to the mold cavity of the main body of the lid, has an annular circumferential groove which runs around the injection opening, so that when the lid is being manufactured, an annular groove is formed around the Injection opening circumferential rib is generated. When the second material is then injected to create the buffer, this rib represents a delimitation of the buffer mold cavity, even if, for example, due to thermally induced material shrinkage of the lid material, a minimal gap should arise on the surface of the lid towards the mold cavity .

The circumferential rib limits the exit of the second material that flows into this gap to a defined area that is enclosed by the rib, so that, for example, irregularly shaped “blobs” of the second material can be seen on the top side of the lid, which is always visible from the outside are avoided and instead the portions of the bumpers that are visible at the top of the lid are with a precisely defined geometry, which improves the appearance of the lid. In addition, this ensures that the amount of second material intended to form the buffer does not flow past the buffer mold cavity in an uncontrolled manner, but can reliably fill the buffer mold cavity completely, so that the design of the buffer provided and accordingly also its noise-damping effect provided by the design effect is guaranteed.

In one embodiment of the method it can be provided that the second material is fed via a supply line to the mentioned injection opening and thus to the mentioned hole created in the main body, and that this supply line or whose injection port is closed by the projection of the slider while the slider is in its first position, and that the inlet line is automatically opened when the slider is moved from its first to its second position. An additional shut-off valve of the supply line is provided, but it can already be opened while the slide is still in its first position, so that the projection of the slide now closes the supply line of the second material. In this way, the second material can flow immediately into the buffer mold cavity and follow the slide as the slide is moved to its second position in the interests of short cycle times. After the buffer mold cavity is filled with the second material, the additionally provided shut-off valve is closed, so that the cover can be removed together with the buffer from the injection mold without further second material escaping from the supply line.

As an alternative to this automatic opening of the supply line, provision can also be made for the second material to be fed to the hole via a supply line in this case, but for the supply line to be closed by a shut-off valve while the slide is in its first position, and that the shut-off valve is only opened after the slider has left its first position. The buffer mold cavity does not have to have been completely created, ie the slide does not yet have to be in its second position, but the closure valve can possibly already be opened while the slide is still moving to its second position. However, the shut-off valve offers the possibility of opening or closing the supply line completely independently of the movement of the slide. For example, it can be provided that the second material only flows into the buffer mold cavity when the slide is already in its second position.

Because, according to the invention, the damping elements are molded onto the main body of the lid or container, the material requirement for the buffers can be kept low, as they do not have to have any areas that must be used to accommodate a fastener such as a screw or the like, and there the buffers themselves do not have to have areas that can be used as fasteners such as e.g. B. by means of a thread. Rather, the shape of the buffer can be limited to the desired damping effect, with a correspondingly low cost of material, and the fact that the buffers are injection molded onto the respective component of the waste container during manufacture of the lid or the container results in the buffer being attached to the main body the respective component without additional fastening elements or additional fastening materials such as adhesive or the like.

Since the component of the waste container on which the buffers are provided is made of plastic, the injection molding of the buffers results in an extremely resilient and correspondingly durable connection of the buffer to the main body of the component. In the first attempts at tearing it out, it turned out that a cohesive fracture is more likely to occur than an adhesive fracture.

While the main body of the component concerned is made of a first plastic material, the buffer is made of a second material which is softer than the first material. According to the first material tests, good acoustic damping properties can be achieved if an elastomer material with a hardness in the range of 50 to 80 Shore A is used as the second material for the buffers.

In an advantageous embodiment, the thickness of the buffer is 3 to 8 mm. With a very soft elastomer, even with a low material thickness of e.g. B. 3 or 4 mm one achieve noise reduction. With an even lower material thickness, the desired damping effect is probably significantly limited. Even greater material thicknesses than the specified 8 mm, on the other hand, represent a comparatively large mass of material, which not only causes higher material costs, but also requires a comparatively long cooling phase in the manufacture of the component in question and therefore causes comparatively long cycle times for the manufacture of the components, which is economically disadvantageous.

A buffer—and in particular all buffers—can advantageously have a U-shaped cross section. This achieves several advantages. Firstly, the dampening properties are improved because, in addition to the material properties per se, the geometry of the buffer also supports a particularly soft response when the lid hits the container of the waste container. Secondly, rapid cooling of the buffer during its manufacture is supported, since a large mass of material is avoided and the contact area with the surrounding injection mold is increased. Thirdly, using a specified amount of material, the diameter of the buffer can be made larger, so that, for example, with regard to manufacturing and assembly tolerances, especially under the changing climatic influences over the course of the year in the interaction between the container and the lid of the waste container, it can always be ensured that the buffer onto the desired associated contact surface of the opposing components when the lid of the waste container is closed. In the case of the U-shaped cross section, it is intended that its opening points towards the other component to which the buffer is not attached, so that the base of the U-shaped cross section provides the largest possible area with which the buffer can be attached to the respective in supporting component is attached.

In one embodiment, the main body to which the buffer is attached can have an opening through which the material of the buffer extends to the opposite side of this main body. This can be advantageous in terms of production technology, in that the material of the buffer does not necessarily have to be brought to the main body from the side on which the buffer is later to be arranged on the main body, but rather the material can be brought in from the opposite side of the main body and through flow through the breakthrough to the desired side of the main body on which the buffer is provided. In addition, the contact surface of the first material of the main body with the second material of the buffer is increased by the opening and also causes a regular positive fit of the buffer with the main body, so that a particularly secure and durable fixing of the buffer on the main body of the component concerned is guaranteed. The proportion of the second material used for the buffer, which is in the opening, is not taken into account when specifying the material thickness of the buffer.

If such an opening is provided, the main body can have a rib on the side opposite the buffer, which runs in the form of a closed ring around the opening. If, in the production of this component, its main body is first made of plastic, for example by injection molding, and if the second material is then introduced to create the buffer, an uncontrolled distribution of this second material on the side facing away from the buffer can be avoided. Rather, the second material flows into a gap that may arise and can only spread as far as this is possible with the closed ring formed by the rib. In this way, firstly, undesired material losses are avoided and, secondly, a defined optical appearance with a through the course of the rib predetermined, defined geometry ensured. The rib can be circular or also deviate from a circular shape.

Advantageously, not just one, but several buffers can be provided at the edge of the respective component, which are distributed at a distance from one another. This ensures that when the lid is closed, the desired damping effect is also achieved if the lid does not hit the container uniformly along its entire circumference. For example, if the cover is handled asymmetrically on one side at high ambient temperatures and is lowered or dropped correspondingly deformed, the desired damping effect is nevertheless ensured by the distributed, multiple buffers.

The lid is pivotable with respect to the container about a hinge axis. Advantageously, if several buffers are provided, as mentioned above, the buffers can be distributed at the edges of the respective component of the waste container in such a way that the edge near the hinge axis is free of buffers. Experience has shown that noise insulation is not necessary at this edge, since the lid hits the container at the lowest speed near this edge. By doing without the buffers on this edge, the most economical design of the waste container is supported.

Advantageously, the lid can be provided with the buffers as a noise-insulated component of the waste container. Since the lid is the much smaller of the two components, setting up the appropriate injection mold to be able to inject the buffers onto the plastic of the lid main body in a two-component process is easier and cheaper than with the container. In addition, there is the possibility of designing existing waste containers with noise insulation to be able to, by only the lids are replaced, which is associated with a significantly lower cost than replacing the containers would cause. Accordingly, in this case the buffers are arranged on the underside of the relevant component, namely the lid, so that when the lid is closed the buffers strike the upper edge of the container or an upper, peripheral collar of the container.

The main body of the lid typically has an irregular shape, provided with beads, edges or shoulders, in order to allow sufficient inherent rigidity and dimensional stability of the lid with the thinnest possible wall thickness of the lid. In this case, the cover typically has an upwardly curved shape overall. Advantageously, the main body of the lid can have depressions at a number of points, in which it deviates from this arched shape and has sections that run comparatively deeper at these points. This shape can also have an advantageous effect on the inherent rigidity of the cover. In particular, however, it is advantageously provided that the buffers are each arranged under such a depression. In this way, the buffers can be designed as flat as possible and still ensure the desired contact with the container, so that the amount of the second material required for the buffer can be kept as low as possible, which is advantageous for the material costs and also the cycle times in the production of the lid influenced.

In one embodiment of the cover, the aforementioned depressions can also be provided at a point at which the cover has no buffers, for example near the hinge axis as described above. In this case, the depressions not only serve to improve the inherent rigidity of the cover, but are particularly advantageously associated with a depression provided with a buffer, in that these both depressions are arranged opposite each other, based on the vertical axis of the lid. In this way, two covers of the same type, offset by 180° about the vertical axis, can be stacked one on top of the other, with the lowering of the upper cover provided with a buffer being immersed in the lowering of the lower cover without a buffer, thus enabling an advantageously low stacking height of the two covers. In this way, the lids can be stored and transported in a space-saving manner.

Fig. 1

eine perspektivische Ansicht von oben auf einen lärmgedämpften Deckel,

Fig. 2

eine perspektivische Ansicht unter den Deckel von Fig. 1,

Fig. 3

eine perspektivische Ansicht von oben auf zwei aufeinander gestapelte Deckel,

Fig. 4

einen Querschnitt durch eine Spritzgussform, die zur Herstellung eines Deckels nach Fig. 1 bestimmt ist, vor der Erzeugung eines Puffers, und

Fig. 5

einen Querschnitt durch denselben Bereich wie in Fig. 4, nach Herstellung eines Puffers.

An exemplary embodiment of a waste container according to the invention and the method for its production are explained in more detail below with reference to the purely schematic representations. while showing

1

a perspective view from above of a soundproof cover,

2

a perspective view under the cover of 1 ,

3

a perspective view from above of two lids stacked on top of each other,

4

a cross-section through an injection mold, according to the production of a lid 1 is determined before creating a buffer, and

figure 5

a cross section through the same area as in 4 , after making a buffer.

In 1 is marked with 1 overall a lid of a waste container. The cover 1 is manufactured using a two-component injection molding process. It consists of a first material, which forms the main body of the lid 1 together with molded hinge tabs 2 on the rear edge of the lid 1 and handles 3 on the front edge of the lid 1. A second material of the cover 1 forms a plurality of buffers 4, with only comparatively small points being recognizable from this second material on the upper side of the cover 1, that the largest Part of each buffer is located on the underside of cover 1. While the cover 1 as a whole has a hood-like, upwardly curved shape, the buffers 4 are located where the main body of the cover 1 has a depression 5 . However, additional depressions 5, on which there are no buffers 4, are also provided near the hinge axis, in the vicinity of the hinge lugs 2, these two cushionless depressions 5 being associated with two opposite depressions 5 on the front edge of the lid, as will be explained in more detail later becomes.

2 shows the lid 1 from its underside. It can be seen here that the buffers 4 on the underside of the cover 1 are designed to be considerably larger than the points that can be seen on the upper side of the cover 1 . Furthermore, it can be seen that the buffers 4 run annularly on their underside, around a centrally arranged trough, and accordingly have a U-shaped cross section, whose opening points downwards to a second component of a waste container, namely the container of the waste container.

The points that can be seen on the upper side of the cover 1 result as extensions of the buffers 4 from the fact that the main body of the cover 1 has openings and during the production of the buffers 4 the second material is pushed from the upper side of the main body through the openings into a buffer mold cavity is injected, which is provided on the underside of the main body. The second material of the cover 1 used for the buffers 4 can be seen on the upper side of the openings, with the in 1 apparent points mentioned above have a defined geometry, since the second material is delimited by a peripheral rib created by the first material during the manufacture of the main body of the lid 1.

In 3 two lids 1 stacked one on top of the other are shown, which are offset from one another by 180° about their vertical axis, so that the hinge plates 2 lie opposite one another. Depressions 5 on the front edge of the upper lid 1, which are arranged between the two handles 3 and are provided with buffers 4, dip into the bufferless depressions 5 of the lower lid 1, which are located between the two hinge lugs 2 of the lower lid 1 at its rear edge condition.

4 shows a cross-section through a portion of an injection mold 19, wherein a mold cavity is created between an upper part 6 and a lower part 7 of the injection mold 19, which is filled with a first material 8 to create the mentioned main body of the lid 1. In the upper part 6 runs a supply line 9 through which a second material can be fed to an injection opening 10 . In the area of the injection opening 10 , the supply line 9 is closed by a needle shut-off valve, in that a valve needle 11 in the supply line 9 projects into the injection opening 10 .

A groove 12 in the upper part 6 of the injection mold 19 runs annularly around the injection opening 10, the groove 12 representing part of the mold cavity and being filled with the first material 8, so that an annular rib 14 of the cover 1 runs around the injection opening 10.

Below the injection opening 10 is located in the lower part 7 of the injection mold 19, a cylindrical slide 15 which is movable in the longitudinal direction and has a projection 16 on its upper side. The slide 15 protrudes with the projection 16 into the mold cavity, the projection 16 extending up to the injection opening 10 and closing it from below. A hole is created in the first material 8 by the protrusion 16, which hole is however filled by the protrusion 16 during manufacture of the main body of the lid 1 is, as in 4 shown. During manufacture of the main body, the slider 15 is in its out position 4 apparent so-called first position.

To produce a buffer 4, the slider 15 is from its first position in the figure 5 visible second position moved down. This creates a buffer mold cavity 17, which extends from the injection opening 10 through the hole in the first material 8, which is now free, and into the lower part 7 of the injection mold 19, and which is limited at the bottom by the slide 15 and its projection 16 . The needle shut-off valve is now opened, in which the valve needle 11 is moved upwards and the injection opening 10 is released so that the second material can flow from the feed line 9 through the injection opening 10 into the buffer mold cavity 17 .

In figure 5 the second material is identified by 18 , the second material 18 only being shown where it forms the buffer 4 for the sake of clarity, but not where there may be quantities of the second material 18 in the feed line 9 . Through the projection 16 is at the bottom of the buffer 4 from 2 apparent central trough created in the buffer 4, so that the buffer 4 has an annular cross-section on its underside.

Furthermore, in figure 5 shown that due to the cooling of the first material 8, a gap has arisen between the injection opening 10 and the first material 8. Accordingly, second material 18 not only flowed into the buffer mold cavity 17 provided therefor, but also flowed radially outward from the injection port 10 above the main body of the lid 1, namely at the top of the first material 8. This portion of the second material 18 forms the in 1 visible points of the buffer 4 at the top of the Lid 1, and these points each have a defined geometry, since they are limited by the ribs 14.

References:

1

lid

2

hinge tab

3

Handle

4

buffer

5

lowering

6

top

7

lower part

8th

First stuff

9

supply line

10

injection port

11

valve needle

12

groove

14

rib

15

slider

16

head Start

17

buffer mold cavity

18

second material

19

injection mold

Claims (16)

waste bin, with a first component designed as a trough, pot or cup-shaped container, and with a second component, which is designed as a lid (1) which is pivotably connected to the container, the waste container having damping elements which are arranged between the two components in such a way that they dampen the lid (1) hitting the container when the lid is closed, wherein the damping elements are made of a softer material than the main body of the component to which the damping elements are attached, characterized, that the damping elements are each designed as a buffer (4) which is molded onto the container or onto the lid (1), the component provided with the buffers (4) being made of plastic. Waste container according to claim 1, characterized, that the buffers (4) consist of an elastomeric material and have a hardness in the range of 50 to 80 Shore A. Waste container according to claim 1 or 2, characterized, in that the buffers (4) each have a thickness which exceeds the main body of the component provided with the buffers in the range of 3 to 8 mm. Waste container according to one of the preceding claims, characterized, that a buffer (4) fixed to one of the two components has a U-shaped cross-section, the opening of which faces the other component. Waste container according to one of the preceding claims, characterized, that the main body of the component provided with a buffer (4) has an opening through which the material of the buffer (4) extends to the opposite side of the main body. Waste container according to claim 5, characterized, that on the opposite side of the main body from the buffer (4) a rib runs around the opening in the form of a closed ring. Waste container according to one of the preceding claims, characterized, that a plurality of buffers (4) are arranged at a distance from one another at the edge of the component. Waste container according to claim 7, characterized, that the buffers (4) are arranged on two opposite side edges and on a front edge of the component, while the edge of the component near the hinge axis is free of bumpers (4). Lid (1) intended to be pivotally connected to a container of a rubbish bin according to any one of claims 1 to 8,
wherein the lid (1) has a main body and at its underside directed towards the container of the waste container has the buffers (4), which are arranged in such a way that they lie against the container when the lid (1) is closed. Lid according to claim 9, characterized, that the main body has a substantially upwardly curved shape, and that in the area of the peripheral edge of the lid (1) the main body has depressions (5) which protrude further downwards in comparison to the rest of the curved shape, and that the buffers (4) are each arranged on the underside of a depression (5). Lid according to claim 10, characterized, that the main body has a depression (5) which is devoid of a buffer (4) and which is arranged opposite a depression of the main body provided with a buffer (4), such that that two similar lids (1), offset by 180° about their vertical axis and aligned with one another, can be stacked on top of one another to save space. A method of manufacturing a noise-insulated cover (1) of a refuse container according to claim 1, wherein a main body of a lid (1) is provided from a first material (8). and a plurality of buffers (4) made of a second material (18) which is softer than the first material (8) are arranged on the underside of the lid (1), wherein the buffers (4) are molded onto the main body of the cover (1) in an injection molding process, the main body of the cover (1) in an injection molding process is made of a plastic material and the buffers (4) are molded onto the main body of the cover (1) while the main body is still in the injection mold (19) used for its manufacture, characterized, that a movable slide (15) arranged in the injection mold (19) is first moved into a first position in which the slide (15) delimits the mold cavity of the main body during manufacture of the main body, and in that , after the main body of the lid (1) has been manufactured, the slider (15) is retracted to a second position remote from the main body such that a cavity is created between the main body of the lid (1) and the withdrawn slider (15). , which forms a buffer mold cavity (17), and that the second material (18) is injected into this buffer mold cavity (17). Method according to claim 12, characterized, in that the slide (15) has a projection (16) which penetrates the mold cavity of the lid (1) when the slide (15) is in its first position, and in that this projection (16) during manufacture of the main body of the lid (1) is encapsulated by the first material (8), and that a hole is then created in the main body of the lid (1) by this projection (16) when the slide (15) is withdrawn to its second position, and that through this hole the second material (18) is injected into the buffer cavity (17) from the side opposite the slide (15), an injection mold (19) for the manufacture of the cover (1) is used, which has an injection port (10) intended to introduce the second material (18) into the hole and which is closed by the protrusion (16) of the slide (15) of the injection port ( 10) is applied when the slide (15) assumes its first position. Method according to claim 13, characterized, that an injection mold (19) is used which, on the side facing away from the slide (15), adjoining the mold cavity of the cover (1), has an annular circumferential groove (12) which runs around the injection opening (10), such that that during the manufacture of the cover (1) a rib (14) running annularly around the injection opening (10) is produced. Method according to claim 13, characterized, that the second material (18) is brought to the hole via a supply line (9). and that this supply line (9) is closed by the projection (16) of the slide (15) while the slide (15) is in its first position, and that the supply line (9) is opened automatically by moving the slider (15) from its first to its second position. Method according to claim 13, characterized, that the second material (18) is brought to the hole via a supply line (9). and that this supply line (9) is closed by a shut-off valve while the slider (15) is in its first position, and that the closure valve is opened after the slide (15) has left its first position.

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