WO2021083874A1

WO2021083874A1 - Carrier body for a bristle insert, brush and method for producing a brush

Info

Publication number: WO2021083874A1
Application number: PCT/EP2020/080150
Authority: WO
Inventors: Bart Gerard Boucherie; Chris DEPICKERE
Original assignee: Gb Boucherie Nv
Priority date: 2019-10-30
Filing date: 2020-10-27
Publication date: 2021-05-06
Also published as: EP4051054B1; EP4051054A1; DE102019129284A1; TW202131825A

Abstract

The invention relates to a carrier body (20) for a bristle insert (10), which is formed from two wire portions twisted together, the carrier body (20) comprising a guide opening (28), the cross-section of which is larger than the cross-section of the twisted wire of the bristle insert (10) to be attached to the carrier body (20), and an embedding surface (30), which is accessible in a direction lateral to the longitudinal direction of the guide opening (28), in particular perpendicularly to the longitudinal direction of the guide opening. The invention further relates to a brush, comprising a carrier body (20) of this type and comprising a bristle insert (10), which is fastened in the carrier body (20), the bristle insert (10) comprising two wire portions twisted together, which clamp a plurality of bristles between said wire portions in a bristle portion (12) and form an anchoring portion (14) in a portion free of bristles, which anchoring portion is received in the carrier body (20) and fastened there, characterized in that the anchoring portion (14) includes a bending portion (16; 17), in which the anchoring portion runs in at least one direction deviating from the longitudinal direction. Finally, the invention relates to a method for producing a brush of this type.

Description

Carrier body for a bristle insert, brush and method for producing a brush

The invention relates to a carrier body for a bristle insert, a brush which has such a carrier body and a bristle insert, and a method for producing such a brush.

The brush consists of filigree brushes such as cosmetic brushes, mascara brushes or interdental brushes, the common feature of which is that they have a bristle insert, the supporting structure of which consists of a wire that is bent in the middle by 180 ° and the two sections of which are twisted together, a plurality of bristles being clamped between the two twisted-together sections along a portion of the wire. The part of the wire provided with the bristles forms a bristle section, and a part which is not provided with bristles forms an anchoring section which is fastened on or in the carrier body.

There are various techniques for attaching the anchoring section to the support body. It is known that the anchoring section is injected into the carrier body. The disadvantage of this method is a very low cycle rate, since it is necessary for the carrier bodies with the bristle inserts embedded therein to remain in the injection mold for a certain time until the injected injection molding material has solidified sufficiently. Even if a multiple injection molding tool is used which has a plurality of cavities, the cycle rate is lower than the cycle rate with which bristle inserts can be produced. It is therefore necessary to temporarily store the bristle inserts produced before they can be connected to the carrier body. Alternatively, the tool that produces the bristle insert is operated at a lower speed than theoretically possible.

It is also known that the anchoring section is heated and pressed into the material of the carrier body in order to be anchored there after it and the material heated by it have cooled down again. The disadvantage of this Method also consists in a very limited clock rate as it takes some time to warm up the anchoring section and then to let it cool down again.

Another method consists in providing a receiving socket for the anchoring section in the carrier body, heating the material of the receiving socket to a softening temperature and then pressing the socket together from two sides after the anchoring section has been inserted into the receiving socket. This method enables high clock rates to be achieved.

However, it has been found that when using a receiving socket as well as with the two other methods, there is a risk that the bristle insert can be “unscrewed” from the carrier body. This is due to the fact that the material of the carrier body does not form a well-adhering connection with the wire of the anchoring section, so that the anchoring section, which has the outer contour of a two-flight worm due to the twisted wire, can be rotated overall relative to the carrier body when the adhesive force is between the wire and the material of the carrier body has been overcome once.

The object of the invention is to create a brush of the cosmetic brush, mascara brush, interdental brush or similar type which can be manufactured at a high cycle rate and in which the bristle insert is reliably anchored on the carrier body. The object of the invention is also to provide a method for producing such a brush.

To achieve this object, according to the invention, a carrier body for a bristle insert is created, the bristle insert being formed from two wire sections twisted together, the carrier body having a guide opening whose cross section is larger than the cross section of the twisted wire of the bristles to be attached to the carrier body, and an embedding surface which is accessible in a direction that is lateral to the longitudinal direction of the guide opening, in particular perpendicular to the guide opening, a natural material being used as the material for the carrier body. A brush with such a carrier body is also required to solve this problem and a bristle insert is provided which is fastened in the carrier body, the bristle insert having two wire sections twisted together, which clamp a plurality of bristles between them in a bristle section and form an anchoring section in a section free of bristles, which is received in the carrier body and fastened there is, characterized in that the anchoring section has a bending section in which it extends in at least one direction deviating from the longitudinal direction. To solve this problem, a method is finally provided in which such a carrier body is first provided. The anchoring section of the bristle insert is then inserted through the guide opening of the carrier body until it lies opposite the embedding surface. A sonotrode is then activated and pressed onto the anchoring section, so that the anchoring section is pressed into the carrier body by the sonotrode and firmly connected to it, the anchoring section being plastically deformed by the sonotrode to form the bending section.

The invention is based on the basic concept of connecting the anchoring section firmly to the carrier body by so-called ultrasonic embedding and thereby plastically deforming the anchoring section in such a way that it no longer has a continuously straight course. "Firmly connect" means that the material of the carrier body is locally deformed in the area of contact with the anchoring area of the bristle insert under the effect of the vibration energy coupled in by the sonotrode and the pressure applied and burns into the anchoring area.

Wood or bamboo is particularly suitable as the material for the carrier body. The use of renewable raw materials results in a good ecological balance.

It has been found that the anchoring section is surprisingly firmly connected to the carrier body when the two parts with the sonotrode are firmly pressed against one another. The anchoring section seems to burn itself into the wood / bamboo material of the carrier body, although no traces of fire are visible.

The anchoring section is fastened more firmly to the carrier body, the deeper it is pressed or embedded into the material of the anchoring section. The anchoring section is preferably embedded in the material of the carrier body in such a way that more than 20% and preferably more than 50% of the cross section of the anchoring section is below the level of the embedding surface.

An embedding surface is characterized by the fact that it is present on the carrier body before the bristle insert is attached (i.e. not first molded in subsequently injected material) and that it is plastically deformed by the anchoring area so that it is embedded in the material of the carrier body (and is not only slightly deformed locally as a result of mechanical pressure exerted by the anchoring area on a surface of the carrier body).

This type of connection between the anchoring section and the carrier body results in various advantages. On the one hand, a very high cycle rate can be achieved, since the energy required for locally connecting the anchoring section to the material of the carrier body can be introduced in a very short time with the sonotrode, since the anchoring section itself does not have to be heated. It is therefore not necessary to clamp or hold the bristle insert and the carrier body together until the material of the carrier body has cooled down again, since so little energy is introduced that the material is cooled down sufficiently almost immediately after the sonotrode is switched off; the wire acts as a heat sink. The time for attaching an anchoring section to the carrier body is less than one second and in particular in the region of fractions of a second. The deformation of the anchoring section creates an anti-twist protection which ensures that the wire can no longer be “unscrewed” from the carrier body. The remaining, undeformed part of the anchoring section then forms a protection against being pulled out. Since a large part of the cross-section or even the entire cross-section of the anchoring section is embedded in the carrier body, overall high holding forces result.

The embedding surface can be flat, and the bending section of the anchoring section can be designed as a concave “dent”, which is pressed into the material of the carrier body by the sonotrode. For this purpose, the sonotrode preferably has a projection that the Anchoring section locally deformed into a bending section which is embedded in the material of the carrier body. The advantage of this embodiment is that the embedding surface of the carrier body can be designed without an undercut. It can also be provided that the embedding surface has a concave depression. The anchoring section is deformed into this recess by the sonotrode when it is pressed onto the anchoring section. The advantage of this design is that no material of the carrier body has to be displaced in order to accommodate the bending section (apart from the small amount of material that has to be displaced when embedding the anchoring section).

It can also be provided that the embedding surface has at least one section extending obliquely to the longitudinal direction of the guide opening, in particular such that the embedding surface is arranged offset from the guide opening. In this embodiment, the bending section of the anchoring section is produced in that the anchoring section is displaced overall by more that is the embedment depth relative to the plane in which it is guided by the guide opening. The anchoring section is preferably displaced by a distance which is more than 200% of the diameter of the anchoring section with respect to the position which is predetermined by the guide opening.

According to one embodiment of the invention it is provided that the embedding surface is the bottom of a narrow slot. The side walls of the slot guide the anchoring section so that the sonotrode can be pressed reliably through the slot onto the anchoring section, even if the sonotrode has a very small width.

The slot can extend straight in the same direction as the guide opening. This makes it easier to push the anchoring section into the slot and onto the embedding surface. It can also be provided that the slot is curved. The anchoring section is deformed in relation to its straight initial shape before it is pressed into the embedding surface by the sonotrode. It is due to the curved course of the anchoring section no longer necessary to deform it locally in order to obtain the desired protection against unscrewing.

The slot preferably has a width of less than 2 mm, particularly preferably less than 1 mm. With this small width, it is not absolutely necessary to subsequently close the slot, since the narrow slot does not impair the usability of the brush.

According to an alternative embodiment it is provided that the embedding surface is the bottom of a shaft. This enables a wider sonotrode to be used to press the anchoring section into the embedding surface. If necessary, a closure part must then be attached in order to close off the carrier body from the outside.

According to a further alternative embodiment, the embedding surface is arranged below several separate access openings. In this embodiment, the embedding surface is not or almost not visible from the outside; the access openings can be made so small that they are perceived as part of the design.

The guide opening preferably has a circular cross section so that the anchoring section of the bristle insert can be reliably guided. In principle, however, other cross-sections are also possible. The guide opening could also be designed as a slot which guides the anchoring section laterally in such a way that it comes to rest at the desired location on the embedding surface.

If a closed guide opening is used, there is the advantage that the guide section keeps all loads away from the anchoring section which attempt to pull the anchoring section “upwards” out of the embedding surface. If the guide opening is designed as a slot, precautions are preferably taken to prevent peeling forces from acting on the anchoring section. The slot should either extend in a direction that prevents the anchoring section from being pulled out of the embedding surface (for example, parallel to the embedding surface), or the slot is subsequently provided with a cover or the like closed, so that a closed guide opening results.

In order to be able to reliably guide the anchoring section, the cross section of the guide opening is preferably adapted to the cross section of the anchoring section; the guide opening has a slightly larger cross-section. The cross-sectional area is preferably less than 2 mm ² and in particular less than 1 mm ² .

The invention is described below on the basis of various embodiments which are illustrated in the accompanying drawings. In these show:

FIG. 1a shows a top view of a carrier body according to a first embodiment with a bristle insert to be attached thereto;

FIG. 1 b shows a top view of a carrier body according to a second embodiment with a bristle insert to be attached thereto;

FIG. 2a shows the carrier body and the bristle insert from FIG. 1a in a perspective sectional view;

FIG. 2b shows the carrier body and the bristle insert from FIG. 1b in a perspective view;

FIG. 3 shows a sectional view of a carrier body according to a third embodiment with a bristle insert to be attached thereto;

FIGS. 4a to 4e schematically show different steps of attaching a set of bristles to a carrier body and an enlarged section through the carrier body with an anchoring section embedded therein;

FIGS. 5a to 5c show various steps for attaching a bristle insert to a carrier body which is designed in a manner similar to the carrier body of FIG. 3;

- Figures 6a and 6b schematically the attachment of a bristle insert to a carrier body according to an alternative embodiment, FIGS. 7a and 7b schematically show the attachment of a bristle insert to a carrier body according to a further embodiment;

FIGS. 8a and 8b show two steps for attaching a closure part to the carrier body of FIG. 5;

FIGS. 9a and 9b show two steps for attaching a closure part to the carrier body of FIG. 7;

FIGS. 10a to 10d show, in a side view and a top view, the attachment of a closure part to a carrier body according to a further embodiment and the finished brush;

FIG. 11 shows schematically the attachment of a bristle insert with a sonotrode according to a further embodiment;

FIG. 12 shows schematically the attachment of a bristle insert with a sonotrode in accordance with yet another further embodiment;

FIG. 13 shows a sectional view of a carrier body according to a further embodiment;

FIG. 14 shows a side view of a bristle insert in a state in which it is anchored in the carrier body of FIG. 13;

FIG. 15 shows a sonotrode of the type used to fasten the set of bristles from FIG. 14 in the carrier body from FIG. 13;

FIGS. 16a to 16d show, in a side view, two schematic views and a sectional view, various steps of fastening a bristle insert in a carrier body similar to the embodiment of FIG. 13; and

FIGS. 17a to 17d show different variants of a brush according to a further embodiment, the carrier body being based on the embodiment according to FIG. .

In FIGS. 1a and 2a, a bristle insert 10 and a carrier body 20 are shown which, when they are joined together, form a brush. It is a cosmetic brush, a mascara brush or an interdental brush. The bristle set 10 consists of a piece of wire that is bent in the middle so that two sections of equal length are obtained. These are twisted together. In this case, a large number of bristles are introduced between the two wire sections that are twisted together in one area, so that the bristles are clamped between the wire sections.

The bristles form a bristle section 12. Outside of the bristle section 12, the twisted wire sections are free of bristles.

The end of the twisted wire opposite the bristle section 12 forms an anchoring section 14 which is intended to be fixedly connected to the carrier body 20.

The carrier body 20 consists of a renewable raw material, in particular wood or bamboo, and has a handle section 22 and a guide section 24.

A slot 26 is provided in the handle section 22, which, viewed here in a plan view, is curved several times, that is to say in an undulating manner.

On its side facing the guide section, the slot 26 merges into a guide opening 28 which extends through the guide section 24.

The slot 26 extends from an outside of the handle section into the interior of the carrier body 20. The bottom surface of the slot 26 forms an embedding surface 30. Due to the slot 26, the embedding surface 30 is accessible laterally (based on the longitudinal direction of the guide opening 28), in particular in a direction perpendicular to the longitudinal direction of the guide opening 28.

The embedding surface 30 is at the same level as the guide opening 28 (more precisely like the part of the wall of the guide opening 28 which is remote from the side of the carrier body 20 on which the slot 26 opens out). The guide opening 28 therefore merges directly and evenly into the embedding surface 30.

When the anchoring section 14 of the bristle insert 10 is pushed into the guide opening 28, it enters the slot 26 Further insertion, it slides along the embedding surface 30, the anchoring section assuming the wave-like shape of the slot 26.

A second embodiment of the carrier element 20 is shown in FIGS. 1b and 2b. The same reference numerals are used for the components known from the previous embodiment, and in this respect reference is made to the explanations above.

The difference to the first embodiment is that the slot 26 is not curved, but straight and in the extension of the guide opening 28. Another embodiment is shown in FIG. The same reference numerals are used for the components known from the previous embodiments, and in this respect reference is made to the explanations above.

The difference to the second embodiment is that a recess 32 is provided between the embedding surface 30 and the guide opening 28. The depth of the recess 32 is more than 100% of the diameter of the anchoring section 14 of the bristle insert 10. The width of the recess 32 (measured perpendicular to the insertion direction and perpendicular to the depth direction) corresponds to the width of the slot 26 adjoining the recess and the width of the embedding surface 30th

In order to prevent the anchoring section 14 from sticking to the edge of the recess 32, a bevel 34 is provided at the transition to the embedding surface 30.

How the bristle insert 10 is fastened to the carrier body 20 is generally explained below with reference to FIGS. 4 a to 4 e. Here, too, the same reference numerals are used for the components known from FIGS. 1 to 3, and reference is made to the above explanations.

In a first step, the bristle insert 10 with its anchoring section is pushed into the carrier body (Figure 4a), more precisely through the guide opening 28 into the slot, so that the anchoring section 14 lies on the embedding surface 30 (Figures 4b and 4c). A sonotrode 60 is then pushed into the slot from the outside (FIG. 4d) and moved until it rests on the anchoring section 14.

The shape and the dimensions of the sonotrode 60 correspond to the shape and dimensions of the slot 26 (or the dimensions are slightly smaller), so that the sonotrode is guided onto the anchoring section 14 of the bristle insert 10.

The sonotrode 60 is activated in such a way that it transmits ultrasonic vibrations to the anchoring section 14. Due to the friction with the material of the carrier body 20, these lead to the material being heated. Due to the mechanical pressure that the sonotrode 60 exerts on the anchoring section 14, the anchoring section 14 is pressed into the heated material of the carrier body 20 and connects to it.

This embedding process can be continued so far that the two wire sections of the anchoring section 14 (at least almost) completely sink into the carrier body. In other words: the anchoring section then lies (at least almost) completely below the embedding surface 30 after it is embedded in the material of the carrier body (see FIG. 4e). In the case of harder materials of the carrier body, however, the anchoring section can also only be partially pressed into the embedding surface. It has been found that in such a case, too, a surprisingly high and in any case sufficient pull-out force results.

Using FIGS. 5a to 5c, it is explained below how the anchoring section 14 is fastened to a carrier body which has the recess 32 known from FIGS. 1b and 2b. The cross-sectional shape of the recess 32 here differs slightly from FIG. 3, namely V-shaped.

The bristle insert 10 is pushed into the carrier body 20 in the same way as described with reference to FIGS. 4a to 4c. The foremost area of the anchoring section is cantilevered over the recess 32.

The sonotrode 60 used here is provided with a deformation projection 62 which, when the sonotrode 60 is pressed onto the anchoring section 14, presses it locally into the recess 32. Through this, a concave bending section 16 is formed on the anchoring section 14. The bending section 16 is pressed into the material of the carrier body 20 by the sonotrode in the same way as the remaining (straight) part of the anchoring section 14.

The bending section 16 improves the anchoring force which the material of the carrier body 20 exerts on the anchoring section 14. In particular, the bending section 16 prevents the anchoring section 14 from being screwed out of the material of the carrier body 20.

If the slot 26 is very narrow, it does not have to be closed. Since it is very much deeper than it is wide, the anchoring section 14 cannot or can hardly be seen at the bottom of the slot.

As an alternative to a method in which the sonotrode deforms the anchoring section 14 during embedding, provision can be made for the deforming and embedding steps to be carried out one after the other by two different tools. This is particularly useful if the wire is so thick that it is preferable to use a more massive tool designed for this purpose than the possibly filigree sonotrode.

In this alternative, the anchoring section is pushed onto the embedding surface, then deformed by means of a stamp and then pressed into the embedding surface by means of the sonotrode.

An alternative embodiment of the carrier body 20 and the connection of a bristle insert 10 to this carrier body 20 are described with reference to FIGS. 6a and 6b. The same reference numerals are used for the components known from the previous embodiments, and in this respect reference is made to the explanations above.

The embedding surface 30 merges into the guide opening 28 flat here and without a depression or the like. In an area in which a bending section 16 is to be produced on the anchoring section 14, the sonotrode 60 is provided with a deformation projection 62. There, when the activated sonotrode 60 is pressed onto the anchoring section 14, the anchoring section 14 is deformed in such a way that it penetrates deep into the material of the carrier body 20 and thereby assumes the negative of the contour of the deformation projection 62. The deformation projection 62 is shown here in the vicinity of the guide opening 28. However, it is also possible to attach the deformation projection 62 at a greater distance from the guide opening 28. However, it is advantageous to attach the bending section as close as possible to the guide opening and thus as close as possible to the section of the bristle insert 10 at which a possible torque is introduced. This ensures that the torque is absorbed by the bending section and that the part of the anchoring section “behind” is not subjected to the torque, but is available for the transmission of tensile forces.

A further embodiment of the carrier body 20 and a resulting, slightly different type of fastening of the connecting section to the carrier body is explained with reference to FIGS. 7a and 7b. The same reference numerals are used for the components known from the previous embodiments, and in this respect reference is made to the explanations above.

The difference to the previous embodiments is that in the embodiment of FIGS. 7a, 7b, the embedding surface 30 is at a level that is below the level of the guide opening 28. When the anchoring section 14 is pushed through the guide opening 28, it is initially exposed above the embedding surface 30.

When the sonotrode 60 is pressed onto the anchoring section 14, it first presses it down onto the embedding surface. In this case, the wire is bent at the transition to the region of the bristle insert 10 which is located in the guide opening 28, so that a bending section 17 is formed there. In contrast to the previous embodiments, in which the bending section 16 is concave, the bending section 17 is only inclined in one direction, since it has to bridge the flea offset between the guide opening 28 and the embedding surface.

The sonotrode is then activated and the anchoring section 14 is pressed into the material of the carrier body 20. The deformation of the bending section 17 increases because it now also has to bridge the embedment depth. In the area in which the bending section 17 is produced, the carrier body then has a bevel. Alternatively, the bending section 17 forms its own path under the action of the sonotrode 60.

If a wider recess is used instead of the slot or the slot is to be closed despite its small width, this recess can be closed again after the anchoring section 14 is embedded in the material of the carrier body 20. For this purpose, a closure part 40 can be used (see FIGS. 8a and 8b), which is fixedly attached to the carrier body 20 in any suitable manner (a press ram 70 is shown here). This corresponds to the embodiment of FIG. 5 here.

A closure part 40 can also be used in the case of a carrier body 20 in which the embedding surface 30 is offset relative to the guide opening 28, as is known from FIG. This is shown in Figures 9a and 9b.

An alternative embodiment of the carrier body 20 is shown in FIGS. 10a to 10d. The same reference numerals are used for the components known from the previous embodiments, and in this respect reference is made to the explanations above.

The difference between the previous embodiments and the embodiment of FIG. 10 is that there is no narrow slot through which the sonotrode is pressed onto the anchoring section 14, but a wide shaft 29, the bottom of which is the embedding surface 30. Accordingly, the closure part is designed in the form of a plate here.

Another embodiment of the sonotrode 60 is shown in FIG. The difference to the sonotrode, as it is known from FIG. 6, is that a deformation projection 63 is used which is not V-shaped or pointed, but rather has a rounded contour.

A further variant of the sonotrode 60 is shown in FIG. The difference from FIG. 11 is that three pointed deformation projections 62 are provided here, so that three bending sections are formed which are embedded deeply in the material of the carrier body 20. In FIGS. 13 and 14, a carrier body 20 and a bristle insert 10 according to a further embodiment are shown. The same reference numerals are used for the components known from the previous embodiments, and reference is made to the above explanations.

The difference between the embodiment of the carrier body 20 from FIG. 13 and the carrier bodies from the other embodiments is that, in the embodiment of FIG. 13, access to the embedding surface 30 is not via a single slot, but via a plurality of separate, i.e. separate ones Access openings 27. These extend similar to ventilation shafts in a mine, which lead to a tunnel; the embedding surface 30 is arranged at the bottom of the tunnel to be ventilated.

In order to achieve the desired anti-twist protection for the anchoring section 14 of the bristle insert 10, some of the access openings 27 are made so deep that a recess 32 results, as is known, for example, from the embodiment of FIG.

The contour of the anchoring section 14 of the bristle insert 10 pressed into the embedding surface 30 and fastened there can be seen in FIG. Corresponding to the two depressions 32 of the anchoring surface, the anchoring section 14 has two “dents”. In the initial state, that is, before the anchoring section 14 is pushed into the carrier body and connected to it, the anchoring section extends in a straight line.

An example of a sonotrode 60, with which the anchoring section 14 is deformed and connected to the embedding surface 30 in a carrier body 10 with a plurality of access openings 27, can be seen in FIG. The sonotrode 60 has a plurality of pins 61 which each extend through one of the access openings into the carrier body 20 and there press on the anchoring section 14. The pins 61 are designed with suitable lengths, that is to say longer where a recess 32 is provided.

In contrast to the previous embodiments, in which the sonotrode 60 has pressed the anchoring section 14 continuously into the embedding surface 30, several are separated from one another here Places created at which the anchoring section 14 is connected to the material of the carrier body 20. It has been found that the desired high holding force can also be achieved in this way.

In FIGS. 16 a to 16 d it can be seen how a bristle insert 10 is connected to a carrier body 20 which has several separate access openings 27.

The bristle insert 10 is pushed into the guide opening 28 with a straight anchoring section 14, so that the anchoring section 14 lies on the embedding surface 30 (FIGS. 16a and 16b).

The anchoring section 14 is then heated by means of a sonotrode 60, as shown in FIG. 15, and pressed against the material of the carrier body 20, the anchoring section being plastically deformed according to the presence of a recess 32 (see FIGS. 16c and 16d). In addition, similar to the embodiment of FIGS. 7a and 7b, a bending section 17 is formed which bridges the height offset between the guide opening 28 and the embedding surface 30.

Since the access openings 27 have a very small cross section, it is not necessary to close them with a separate closure part.

In FIGS. 17a to 17d, different variants of a brush are shown in which, in addition to several access openings 27, a large number of small recesses 80 are present. The recesses serve to increase the grip. Each of the recesses 80 has a cross section that corresponds to the cross section of the access openings 27. Therefore, the access openings 27 differ from the recesses 80 only because of their depth; The anchoring section 14 is visible at the bottom of the recesses. However, since the cross section of the access openings is quite small, it is not necessary to close the access openings; they can hardly be identified as such in the set of recesses 80.

The particular advantage of the support bodies and brushes according to the invention is that the renewable raw material (in particular wood or bamboo) used for the support body results in a good ecological balance and a high level of sustainability. Also don't need any adhesives or other chemical products used; a mechanically firm connection between the anchoring section 14 of the bristle insert 10 and the material of the carrier body 20 results only as a result of the pressure applied and the heat generated.

Claims

1 . Carrier body (20) for a bristle insert (10) which is formed from two wire sections that are twisted together, the carrier body (20) having a guide opening (28) whose cross section is larger than the cross section of the twisted wire on the carrier body (20) bristle insert (10) to be attached, and an embedding surface (30) which is accessible in a direction lateral to the longitudinal direction of the guide opening (28), in particular perpendicular to the longitudinal direction of the guide opening, the carrier body (20) being made of a natural material.

2. T carrier body (20) according to claim 1, characterized in that it consists of wood or bamboo.

3. Carrier body (20) according to claim 1 or claim 2, characterized in that the embedding surface (30) is flat.

4. Carrier body (20) according to claim 1 or claim 2, characterized in that the embedding surface (30) is arranged offset to the guide opening (28).

5. Carrier body (20) according to claim 4, characterized in that the embedding surface (30) has at least one section extending obliquely to the longitudinal direction of the guide opening (28).

6. Carrier body (20) according to claim 1 or claim 2, characterized in that the embedding surface (30) has a concave recess (32).

7. Carrier body (20) according to one of the preceding claims, characterized in that the embedding surface (30) is the bottom of a narrow slot (26).

8. Carrier body (20) according to claim 7, characterized in that the slot (26) extends straight in the same direction as the guide opening (28).

9. Carrier body (20) according to claim 7, characterized in that the slot (26) is curved. 10. Carrier body (20) according to one of claims 7 to 9, characterized in that the slot (26) is less than 2 mm wide and preferably less than 1 mm.

11. Carrier body (20) according to one of claims 1 to 6, characterized in that the embedding surface (30) is the bottom of a shaft.

12. Carrier body (20) according to one of the preceding claims, characterized in that the embedding surface (30) is arranged below a plurality of separate access openings (27).

13. Carrier body (20) according to one of the preceding claims, characterized in that the guide opening (28) has a circular cross section.

14. Carrier body (20) according to claim 13, characterized in that the cross-sectional area of the guide opening (28) is smaller than 2 mm ² , in particular smaller than 1 mm ² . 15. Brush with a carrier body (20) according to one of the preceding

Claims and a bristle insert (10) which is fastened in the carrier body (20), the bristle insert (10) having two wire sections twisted together, which clamp a plurality of bristles between them in a bristle section (12) and in a section free of bristles Form an anchoring section (14) which is received in the support body (20) and fastened there, characterized in that the anchoring section (14) has a bending section (16; 17) in which it extends in at least one direction deviating from the longitudinal direction .

16. Brush according to claim 15, characterized in that the anchoring section (14) is embedded in the material of the carrier body (20) in such a way that more than 50% of the cross section of the anchoring section (14) is below the level of the embedding surface (30).

17. Brush according to claim 15 or claim 16, characterized in that the bending section is a deflection section (17), so that the anchoring section (14) by more than 200% of the diameter of the Anchoring section (14) is offset from the level of the guide opening (28).

18. Brush according to claim 17, characterized in that the bending section (16) is concave. 19. A method for producing a brush according to any one of claims 15 to

18 by means of the following steps: a carrier body (20) according to one of claims 1 to 14 is provided, the anchoring section (14) of the bristle insert (10) is inserted through the guide opening (28) until it is opposite the embedding surface

(30) lies,

- A sonotrode (60) is activated and pressed onto the anchoring section (14), so that the anchoring section (14) is pressed into the carrier body (20) by the sonotrode (60) and firmly connected to it, the anchoring section (14 ) is plastically deformed by the sonotrode (60) in order to form the bending section (16; 17).

20. The method according to claim 19, characterized in that the anchoring section (14) is plastically deformed by the sonotrode (60) until it lies flat on the embedding surface (30). 21st Method according to Claim 19 or Claim 20, characterized in that the anchoring section (14) is pressed locally by the sonotrode (60) into a depression (32) in the embedding surface (30).