Tool for use in the machine potting of plants

Abstract

A tool (1) for use in the machine potting of plants (2), in particular for cleaning a sprinkling rim of pots filled with substrate and having a planting hole, is shown and described, with which the potting of plants can be carried out even more efficiently and downtimes during potting can be further reduced. The tool (1) according to the invention has a cylindrical base body (3) with a connecting shaft (4), a tip (5) and a central section (6) arranged between the connecting shaft (4) and the tip (5) and a cylindrical bushing (7) which surrounds the central section (6) of the cylindrical base body (3) in such a way that a channel (8) is formed between the central section (6) and the bushing (7), wherein the channel (8) has an inlet (9) and a radially open outlet (10) so that compressed air (11) introduced via the inlet (9) can flow out of the outlet (10) through the channel (8).

Description

[0001] The invention relates to a tool for use in the machine potting of plants, in particular for cleaning the rim of pots filled with substrate and having a planting hole. The invention also relates to a method for cleaning the rim of a pot with a planting hole of substrate fibers, using a corresponding tool.

[0002] To plant a plant in a pot completely filled with potting mix, a planting hole must first be created in the mix using a suitable drill bit. These drill bits consist of a connecting shaft and a drill body, allowing the bit to be attached to a suitable machine via the connecting shaft. The drill body has a helical spiral that creates the planting hole in the potting mix. The length and diameter of the drill body depend on the dimensions of the pot and the size of the plant or root ball to be planted in it.

[0003] Such a drill is known, for example, from DE 1 782 509 A. The drill body has a spiral, helical thread running from its tapered lower end to its upper end, which allows a corresponding planting hole to be created in a pot filled with substrate. By reversing the direction of rotation, the substrate in the pot can also be compacted, which has proven advantageous when repotting from one pot size to a slightly larger one. The drill can be arranged together with other drills on a multi-drilling unit that has a common drive device, so that a planting hole can be created in several pots simultaneously using a single drill.

[0004] CN 106256178 B discloses a work platform for the care of potted plants. The work platform has a frame with a sliding device and a rotating device mounted on it, allowing a potted plant mounted on the rotating device to be positioned anywhere within the frame. A device located above the potted plant, which includes a needle tube, can be used to create holes in the soil of the potted plant, thus loosening the soil. Water or fertilizer can also be introduced into the soil of the potted plant through holes in the needle tube.

[0005] From CN 1 06 665 178 A a tool is known with which nutrient medium placed in a storage container can be compressed by means of a plate and at the same time a seed furrow can be made in the surface of the nutrient medium, thereby simplifying the subsequent sowing.

[0006] In the industrial production of planted pots, known as potting, the drills are used as part of a potting machine. This machine includes a substrate hopper, a pot magazine, an elevator, a conveyor belt, and a drilling station. The substrate is conveyed step by step from the substrate hopper to the elevator, which fills the individual pots, taken from the pot magazine, with substrate one after the other. A filled pot is then transported to the drilling station by a transport device, where the drill creates a planting hole in the substrate inside the pot. The young plants are then placed into the individual pots, either manually or using another machine. Such potting machines allow for the planting of a large number of pots in a short time, reducing the number of manual steps required.

[0007] Since the individual pots used in practice are initially filled completely with substrate by the potting machines, weeds and moss can develop on the surface of the pot or substrate. To prevent this, the top layer of substrate must be removed after the young plant is placed in the planting hole and replaced with, for example, bark mulch or compost. This requires an additional manual step and significantly increases the time required for planting the pots.

[0008] German patent application DE 10 2016 111 551 A1 discloses a drill for the mechanical creation of planting holes, which enables the planting of pots filled with substrate in a simple manner. In addition to the helical spiral for creating a planting hole, the drill has two paddle elements that remove the upper layer of the substrate placed in the pot during the drilling process. For this purpose, the paddle elements have a radial extension corresponding to the inner radius of the pot in which the planting hole is to be created, so that the entire upper layer of substrate is lifted out of the pot by the paddle elements. This substrate can then be used to fill other pots.

[0009] When the drill is lowered into the pot filled with substrate, the planting hole is created by its spiral action. Simultaneously, the rotating auger blades lift the top layer of substrate, creating a rim at the top of the pot. This rim can then be filled with bark mulch or used as a watering basin after the plant is placed in the hole. There is no need to manually remove the top layer of substrate before adding bark mulch, thus eliminating the time and effort associated with this step.

[0010] Even when using the drill bit known from DE 10 2016 111 551 A1, problems still arise during plant potting that negatively affect the effectiveness and efficiency of the process. When the planting hole is drilled into the pot filled with substrate and a top layer of substrate is removed, substrate fibers remain loose on the rim of the pot or the raised bed inside the pot. During transport from the drilling station to the next station, where the young plants are planted, some of these fibers fall out onto the conveyor belts. The fibers can then become lodged in the bearings of the conveyor belts, eventually leading to a standstill of the belts or necessitating repairs and cleaning.Similarly, loose substrate fibers can be washed over the edge of the pots during the initial flooding process, potentially clogging the filters of the trays in which the pots are placed. Substrate fibers hanging over the edge of the pots can also cause problems with labeling, as the labels will not be securely attached.

[0011] The present invention is therefore based on the objective of providing a tool for use in the machine potting of plants, with the help of which the potting of plants can be carried out even more efficiently and downtimes during potting can be further reduced.

[0012] This problem is solved in the tool according to the invention with the features of claim 1. Advantageous embodiments are specified in the dependent claims. The tool according to the invention has at least one cylindrical base body comprising a connecting shaft, a tip, and a central section arranged between the connecting shaft and the tip, and a cylindrical bushing that surrounds the central section of the cylindrical base body such that a channel is formed between the central section and the bushing. The channel has an inlet and a radially open outlet, so that air introduced through the inlet can flow out of the outlet through the channel.

[0013] The tool according to the invention makes it possible to easily blow substrate fibers and substrate residues, which lie loosely on the edge of the pot or the raised bed formed in the pot, over the edge of the pot using compressed air. For this purpose, the tool has a channel with an inlet through which compressed air can flow into the tool. The channel also has a radially open outlet through which the compressed air can flow out, allowing loose substrate fibers or substrate residues to be blown out over the edge of the pot by the outgoing compressed air, thus creating a largely substrate-free raised bed in the planting pot.

[0014] According to a preliminary embodiment of the tool according to the invention, the channel between the central section of the cylindrical base body and the bushing is designed as an annular channel, and the outlet of the channel is correspondingly ring-shaped. This allows for particularly fast and effective blowing out of substrate residues without having to rotate the tool about its longitudinal axis.

[0015] According to a further particularly advantageous embodiment of the tool according to the invention, a collar concentrically surrounding the cylindrical base body is formed or arranged between the tip of the base body and the bushing, the outer diameter of which is larger than the outer diameter of the tip. During operation, the tool is lowered into the pot such that the tip of the tool is in the planting hole formed in the substrate and the underside of the collar is located directly above or on the raised rim formed in the pot. The collar resting on the raised rim then acts as an air turbulence guard, so that no substrate is dislodged in the area of ​​the planting hole by the airflow exiting the outlet above the collar. The airflow is directed by the collar towards the edge of the pot, whereby only the loose substrate residues located there are blown out of the pot.

[0016] According to a further advantageous embodiment, the cylindrical bushing has an outwardly projecting flange on its side facing the collar, such that an annular or disc-shaped gap is formed between the underside of the flange and the top of the opposite collar. This gap forms part of the channel, with the channel outlet located at its radial end. When the tool according to the invention is connected to a compressed air line, compressed air initially flows through the annular channel between the central section of the cylindrical base body and the bushing arranged concentrically to it, in the longitudinal direction of the base body or the tool. At the collar, the compressed air is deflected outwards by 90°, so that it flows outwards through the gap between the collar and the flange via the annular outlet. The outer diameter of the collar preferably corresponds approximately to the outer diameter of the bushing's flange.However, the outer diameter of the collar can also be slightly larger or slightly smaller than the outer diameter of the flange.

[0017] It is particularly advantageous if the airflow through the tool or the gap can be adjusted not only by the pressure of the supplied compressed air, but also by the dimensions of the gap, especially its height. For this purpose, the collar and / or the bushing is movably arranged in the longitudinal direction of the cylindrical base body, so that the height of the gap between the flange and the collar can be adjusted simply by changing the position of the collar or the bushing.

[0018] According to a further preferred embodiment, the cylindrical base body is formed in at least two parts, wherein at least the tip is designed as a separate component from the rest of the base body and is detachably connected to the central section. The detachable connection of the tip of the base body to the central section, which can be achieved, for example, by a screw connection, allows for easy assembly of the collar onto the base body. The collar can then, for example, be designed as an annular disc that can be clamped between the tip of the base body and the flange of the sleeve. Alternatively, the collar can also be formed on a separate bushing, which is slipped onto the central section from the side of the central section facing the tip and then secured to the base body by fastening the tip to the central section.The previously described multi-part design of the tool also offers the advantage that, depending on the diameter of the pots in which the tool is to be used, different collars and / or different bushings can be connected to the main body. Likewise, differently sized tips can be used, which are also adapted to the size of the respective pot or the size of the planting hole.

[0019] In addition to the cylindrical base body and the cylindrical bushing, the tool preferably also has a receiving housing, wherein a bore is formed in the receiving housing in which at least a part of the cylindrical base body and a part of the cylindrical bushing are mounted. The receiving housing also has a supply channel which is fluidically connected inside the receiving housing to the inlet of the channel between the central section of the cylindrical base body and the bushing. The end of the supply channel opposite the main channel preferably has a connection for a pressure line, so that compressed air can flow into the tool through the supply channel. If, according to the preferred embodiment, the channel of the tool is designed as an annular channel, an annular groove is preferably formed in the receiving housing between the supply channel and the inlet of the annular channel, through which the compressed air is distributed evenly.The feed channel is then fluidically connected to the inlet of the annular channel of the tool via the annular groove.

[0020] The inventive method for cleaning a rim of substrate fibers in a pot with a planting hole, using a tool, comprises, as a step according to claim 10, positioning the pot on a pot support. The pot support is, for example, part of a transport device of a potting machine, by which the pot is moved from the drilling station to another station, where, for example, a young plant is inserted into the drilled hole in the pot. Alternatively, the pot support can also be a stationary support or receptacle onto which the pot filled with substrate is positioned.

[0021] The pot support is initially positioned relative to the tool so that a pot placed on the support is correctly aligned with the tip of the cylindrical base. The free end of the base's tip is initially positioned above the upper rim of the pot. The tool is then lowered into the pot until its tip is in the planting hole formed in the substrate. The tool is lowered until the outlet of the channel is directly above the raised rim of the pot. When compressed air flows through the tool, only the loose substrate residue and fibers resting on the raised rim or the edge of the pot are blown out of the pot by the air exiting the channel.

[0022] A further step of the method according to the invention consists in connecting compressed air to the inlet of the channel or to the inlet of the supply channel, so that air introduced via the inlet flows through the channel and then flows out of the outlet. As a rule, the compressed air is first connected to the inlet of the channel or the supply channel before the tool is lowered into the pot.

[0023] If the tool has a collar concentrically surrounding the main body, it is lowered into the pot until the underside of the collar is directly above, or rests on, the raised rim formed in the pot. The air flowing through the channel towards the outlet is then guided over the collar, preventing unwanted turbulence or the dislodging of substrate that is not loosely resting on the raised rim, particularly in the area of ​​the planting hole.

[0024] In detail, there are several ways to design the tool according to the invention. Reference is made to both the dependent claims and the following description of an exemplary embodiment in conjunction with the drawing. The drawing shows Fig. 1 A side view of an embodiment of the tool according to the invention, Fig. 2 the tool according to Fig. 1, in longitudinal section, Fig. 3 an exploded view of individual components of the tool according to Fig. 1, in longitudinal section, Fig. 4 the tool's receiving housing according to Fig. 1, in longitudinal section, Fig. 5 A simplified representation of a section of a potting machine, with a tool lowered above a pot according to Fig. 1, Fig. 6 a simplified representation of the section of the potting machine according to Fig. 5, with a tool lowered into the pot, and Fig. 7. a pot with the plant placed in it after the Fig. 5 and Fig. 6. Cleaning procedure of the sprinkling edge shown.

[0025] Fig. Figure 1 shows a preferred embodiment of a tool 1 according to the invention for use in the mechanical potting of plants 2 from the side. Fig. Figure 2 shows a longitudinal section through the tool 1. The tool 1 has a cylindrical base body 3, which includes a connecting shank 4, a tip 5, and a central section 6 arranged between the connecting shank 4 and the tip 5. Furthermore, the tool 1 has at least one cylindrical bushing 7 that surrounds the central section 6 of the cylindrical base body 3 such that a channel 8 is formed between the central section 6 and the bushing 7. The inner diameter of the hollow bushing 7 is therefore slightly larger than the outer diameter of the cylindrical base body 3 in the region of the central section 6.

[0026] As shown in the sectional view according to Fig. As can be seen in Figure 2, the channel 8 has an inlet 9 and a radially open outlet 10, allowing compressed air 11, which is introduced into the channel 8 via the inlet 9, to flow out of the outlet 10. The compressed air 11 flowing out of the outlet 10 causes loose substrate fibers or substrate residues to be blown over the edge of the pot, resulting in a largely substrate-free rim in the planting pot. The compressed air 11 flowing through the tool 1 is simplified as a dashed line.

[0027] In the preferred embodiment of the tool 1 shown in the figures, the channel 8 between the central section 6 of the cylindrical base body 3 and the bushing 7 is designed as an annular channel. Furthermore, the outlet 10 of the channel 8 is annular in shape, which allows for particularly rapid blowing out of substrate residues from the entire spreading edge without having to rotate the tool 1 about its longitudinal axis.

[0028] Furthermore, a collar 12, concentrically surrounding the base body 3, is arranged between the tip 5 of the cylindrical base body 3 and the bushing 7. Corresponding to the collar 12, the cylindrical bushing 7 has a flange 13 on its side facing the collar 12. The collar 12 is arranged relative to the flange 13 such that a gap 14 is formed between the underside of the flange 13 and the top side of the collar 12. This gap forms part of the channel 8 through which the compressed air 11 can flow towards the outlet 10 formed at the radial end of the gap 14. The outer diameter of the collar 12 is preferably at least as large as the outer diameter of the flange 13 of the bushing 7.

[0029] The arrangement of collar 12 and flange 13 directs the compressed air specifically towards the edge of the pot 30. Furthermore, the collar 12, which rests on the spreading rim 28 during operation of the tool 1, acts as an air turbulence guard, preventing the airflow exiting the outlet 10 above the collar 12 from dislodging any substrate 32 from the area of ​​the planting hole 29. Because the airflow is directed through the gap 14 towards the edge of the pot 30, only the loose substrate fibers 31 located there are intentionally blown out of the pot 30 (see figure). Fig. 6).

[0030] Fig. Figure 3 shows an exploded view of individual components of the tool 1. The cylindrical base body 3 is formed in two parts, with the connecting shaft 4 and the central section 6 forming the first part and the tip 5 forming the second part. The tip 5 has a bore 15 with an internal thread 16. Correspondingly, the end of the central section 6 facing away from the connecting shaft 4 has an external thread 17, so that the tip 5 with its internal thread 16 can be screwed onto the external thread 17 of the central section 6. The two-part design of the cylindrical base body 3 allows for particularly easy assembly of the collar 12, which has a bore 18 for this purpose, so that the collar 12 can be pushed onto the end of the central section 6 facing away from the connecting shaft 4.For this purpose, a circumferential stop 19 is formed on the central section 6, up to which the collar 12 can be pushed before the tip 5 is screwed onto the end of the central section 6, so that the collar 12 is clamped between the tip 5 and the stop 19.

[0031] Another component of tool 1 is in Fig. Figure 3 shows the bushing 7, which has the flange 13 on its side facing the collar 12 or the tip 5. Since the inner diameter of the bushing 7 is larger than the outer diameter of the corresponding area of ​​the central section 6, an annular channel 8 is formed between the central section 6 and the bushing 7, through which introduced compressed air can flow towards the outlet 10.

[0032] Fig. 4 shows as another component of the in the Fig. 1 and Fig. The tool 1 shown in Figure 2 has a receiving housing 20, which serves to receive the bushing 7 and the cylindrical base body 3. For this purpose, the receiving housing 20 has a through bore 21, wherein the bore 21 has several sections with different diameters. In the Fig. In the lower section of bore 21 shown in Figure 4, which has a larger diameter, an internal thread 22 is formed into which the bushing 7 with its corresponding external thread 22 can be screwed. In the section shown in Figure 4, the bore 21 has a larger diameter. Fig. In the upper section of the bore 21 shown in Figure 4, which has a smaller diameter, a further internal thread 24 is formed, to which a corresponding external thread 25 is formed on the connecting shaft 4, so that the connecting shaft 4 can be screwed into the receiving housing 20 or the internal thread 24 with the external thread 25.

[0033] The two internal threads 22, 24 in the bore 21 of the receiving housing 20 allow the cylindrical base body 3 and the bushing 7 to be independently fastened in the receiving housing 20. This allows the bushing 7 to be moved or adjusted in its position relative to the cylindrical base body 3 in the longitudinal direction L, thereby adjusting the height of the gap 14 between the flange 13 of the bushing 7 and the collar 12 attached to the central section 6 of the cylindrical base body 3.

[0034] The receiving housing 20 also has a feed channel 26, which is fluidically connected inside the receiving housing 20 to the inlet 9 of the channel 8 between the central section 6 and the socket 7. As can be seen from Fig. As can be seen in Figure 4, an annular groove 27 is formed between the supply channel 26 and the annular channel 8, through which compressed air 11 introduced into the receiving housing 20 via the supply channel 26 is distributed in an annular manner.

[0035] The following will be based on the Fig. 5 and Fig. 6 the inventive method for cleaning a litter rim 28 in a pot 30 having a planting hole 29 of substrate fibers 31 is described. Fig. Figure 5 shows a pot 30 partially filled with substrate 32, in which the planting hole 29 and the rim 28 were previously drilled using a suitable drill bit. The pot 30 rests on a pot support 33, which allows it to be positioned for working. The tool 1 is positioned above the pot 30, with the free end of its connecting shaft 4 attached to a receptacle 34, allowing the tool 1 to be moved along its longitudinal axis L. This allows the position of the tool 1 relative to the pot 30 on the pot support 33 to be changed.

[0036] While Fig. Figure 5 shows the tool 1 in its starting position, in which the tip 5 is located at a slight distance above the upper edge of the pot 30. Fig. 6. The tool 1 is in its working position. For this purpose, the tool 1 has been lowered into the pot 30 until the tip 5 of the tool 1 is located in the planting hole 29 formed in the substrate 32. Furthermore, the outlet 10 of the channel 8 is located directly above the rim 28 formed in the pot 30. The outer dimensions of the tip 5 correspond approximately to the diameter of the planting hole 29, thus ensuring that the planting hole 29 remains intact. When compressed air is connected to the supply channel 26 in the receiving housing 20, this compressed air flows through the channel 8 formed between the central section 6 and the bushing 7 towards the outlet 10. The compressed air 11 exiting from the outlet 10 of the gap 14 between the flange 13 and the collar 12, indicated by an arrow, then causes loose substrate fibers 31, which are located on the spreading edge 28, to be blown out over the edge of the pot 30.

[0037] Since the tool 1, in its working position, is located with the underside of the collar 12 directly above the spreading rim 28 formed in the pot 30, or rests slightly on the spreading rim 28, the collar 12 acts as an air vortex guard, directing the compressed air 11 flowing through the channel 8 towards the edge of the pot 30. The collar 12 thus prevents the airflow from dislodging substrate 32 in the area of ​​the planting hole 29. Instead, it ensures that the compressed air 11 only blows the loose substrate fibers 31 located on the spreading rim 28 at the edge of the pot 30 out over the edge of the pot 30.

[0038] After loose substrate fibers 31 have been blown out over the edge of the pot 30 using tool 1 or the compressed air flowing through channel 8 in tool 1, tool 1 is raised back to its starting position or the pot 30 is lowered with the support 33. The pot 30 can then be transported to another workstation. There, a plant 2, in particular a young plant, can be placed in the planting hole 29 and then – as in Fig. 7 shown - a layer of bark mulch 35 or compost is sprinkled onto the rim 28 so that the pot 30 is then essentially filled to the rim. Reference sign 1 tool 2 plants 3 basic shapes 4 connection shaft 5 top 6 Middle section 7 socket 8-channel 9 Admission 10 Outlet 11 Compressed air 12 collars 13 Flange 14 columns 15 holes in the tip 16 internal threads 17 external threads on the middle section 18 holes in the collar 19 attacks on the central section 20 recording housings 21 bore 22 internal threads 23 External thread bushing 24 internal threads 25 external thread connection shaft 26 Supply channel 27 Nut 28 Scattering edge 29 planting holes 30 pots 31 substrate fibers 32 Substrat 33 Pot holder 34th recording 35 bark mulch

Claims

[1] Tool (1) for use in the mechanical potting of plants (2), comprising a cylindrical base body (3) which has a connecting shaft (4), a tip (5) and a central section (6) arranged between the connecting shaft (4) and the tip (5), and with a cylindrical bushing (7) which surrounds the central section (6) of the cylindrical base body (3) in such a way that a channel (8) is formed between the central section (6) and the bushing (7), wherein the channel (8) has an inlet (9) and an outlet (10) open in the radial direction, so that compressed air (11) introduced via the inlet (9) can flow out of the outlet (10) through the channel (8). [2] Tool (1) according to claim 1, characterized by that the channel (8) between the central section (6) of the cylindrical base body (3) and the bushing (7) is designed as an annular channel and the outlet (10) of the channel (8) is annular. [3] Tool (1) according to claim 1 or 2, characterized by that a collar (12) concentrically surrounding the base body (3) is formed or arranged between the tip (5) of the cylindrical base body (3) and the bushing (7). [4] Tool (1) according to claim 3, characterized by that the cylindrical bushing (7) has a flange (13) on its side facing the collar (12), so that a gap (14) is formed between the underside of the flange (13) and the top side of the collar (12), which gap forms part of the channel (8) and at the radial end of which the outlet (10) is formed, wherein the outer diameter of the collar (12) is preferably at least as large as the outer diameter of the flange (13) of the bushing (7). [5] Tool (1) according to claim 4, characterized bythat the collar (12) and / or the bushing (7) is movable in the longitudinal direction (L) of the cylindrical base body (3) so that the height of the gap (14) between the flange (13) and the collar (12) is adjustable. [6] Tool (1) according to one of claims 1 to 5, characterized by that the cylindrical base body (3) is formed at least in two parts, wherein the tip (5) is detachably connected, in particular screwed, to the central section (6). [7] Tool (1) according to one of claims 1 to 6, characterized by that a receiving housing (20) is provided with a bore (21) in which a part of the cylindrical base body (3) and a part of the cylindrical bushing (7) are fastened, and that the receiving housing (20) has a supply channel (26) which, in the interior of the receiving housing (20), is fluidically connected to the inlet (9) of the channel (8) between the central section (6) of the cylindrical base body (3) and the bushing (7). [8] Tool (1) according to claim 7, characterized by that an annular groove (27) is formed in the receiving housing (20) between the supply channel (26) and the inlet (9) of the channel (8). [9] Tool (1) according to claim 7 or 8, characterized by that the bore (21) in the receiving housing (20) is designed as a through bore (21), wherein on one side of the receiving housing (20) the connecting shaft (4) and on the other side of the receiving housing (20) a part of the central section (6) of the base body (3) with a part of the bushing (7) protrudes. [10] Method for cleaning a scattering edge (28) in a pot (30) having a planting hole (29) of substrate fibers (31) with a tool (1) according to one of claims 1 to 9, characterized by the following steps: • Position the pot (30) on a pot support (33) • Lowering the tool (1) into the pot (30) into a position in which the tip (5) of the tool (1) is in the planting hole (29) formed in the substrate (32) and the outlet (10) of the channel (8) is located directly above the spreading edge (28) formed in the pot (30), and • Connecting compressed air (11) to the inlet (9) of the channel (8) formed between the central section (6) and the bushing (7), so that compressed air (11) introduced via the inlet (9) flows through the channel (8) and flows out of the outlet (10). [11] Method according to claim 10, wherein between the tip (5) of the cylindrical base body (3) and the bushing (7) a collar (12) is formed or arranged which concentrically surrounds the base body (3), the outer diameter of which collar is greater than the outer diameter of the bushing (7), wherein the tool (1) is lowered into the pot (30) to such an extent that the underside of the collar (12) is located directly above the spreading edge (28) formed in the pot (30) or rests on the spreading edge (28). [12] Method according to claim 11, wherein the cylindrical bushing (7) has a flange (13) on its side facing the collar (12), so that a gap (14) is formed between the underside of the flange (13) and the top side of the collar (12), which gap forms part of the channel (8) and at the radial end of which the outlet (10) is formed, wherein in order to adjust the desired air flow through the outlet (10), the height of the gap (14) is adjusted by changing the position of the collar (12) and / or changing the position of the bushing (7) in the longitudinal direction (L) of the cylindrical base body (3).

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