TWI841619B - Carrier for bristle insert, brush and method for producing a brush - Google Patents

Abstract

The present invention relates to a carrier (20) for a bristle insert (10), the bristle insert (10) being formed by two wire sections intertwined with each other, wherein the carrier (20) has a guide opening (28) and an embedding surface (30), the cross-section of the guide opening (28) being larger than the cross-section of the intertwined wire of the bristle insert (10) to be mounted on the carrier (20), and the embedding surface (30) being approachable 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 present invention also relates to a brush having such a carrier (20) and a bristle insert (10) fixed in the carrier (20), wherein the bristle insert (10) comprises two wire sections intertwined with each other, the wire sections sandwiching a plurality of bristles between the wire sections in the bristle section (12) and forming an anchoring section (14) in the bristle-free section, the anchoring section (14) being accommodated in the carrier (20). The invention relates to a brush having a fixing surface (30) and a fixing surface (31) in the carrier body (20), wherein the fixing surface (31) is fixed to ...

Description

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

The invention relates to a carrier for a bristle insert, a brush comprising such a carrier and a bristle insert and a method for manufacturing such a brush.

The brush is a fine brush, such as a makeup brush, a mascara brush or an interdental brush, which has a bristle insert in common, the carrying structure of which is composed of a wire that is bent 180° in the middle, and two parts of the wire are intertwined with each other, wherein a plurality of bristles are sandwiched between the two intertwined parts along a part of the wire. The part of the wire with bristles forms the bristle part, and the part without bristles forms the anchoring part, which is fixed on or in the carrier.

There are various techniques for fixing the anchoring part to the carrier. It is known that the anchoring part is injected into the carrier. The disadvantage of this method is the very low cycle rate, because the carrier together with the bristle insert embedded in the carrier must be kept in the injection molding mold for a certain period of time until the injected injection molding material is sufficiently cured. Even if a multi-injection molding mold with multiple cavities is used, the cycle rate is lower than the manufacturing cycle rate of the bristle insert. Therefore, the produced bristle inserts must be temporarily stored before they can be connected to the carrier. Alternatively, the tool for manufacturing the bristle inserts operates at a speed lower than theoretically possible.

It is also known to heat the anchoring part and press it into the material of the carrier so that it is anchored there after the anchoring part and the material heated by the anchoring part have cooled down again. This method also has the disadvantage that the cycle rate is very limited, since some time is required to heat the anchoring part and then cool it down again.

Another method is to provide a receptacle for the anchoring part in the carrier, heat the material of the receptacle to a softening temperature, and then compress the receptacle from both sides after the anchoring part is inserted into the receptacle. High cycle rates can be achieved using this method.

However, it has been found that when using a receptacle as well as when using the other two methods, there is a risk that the bristle insert can be "screwed out" of the carrier. This is because the material of the carrier cannot form a good adhesive connection with the wire of the anchoring part, so that the anchoring part with a double-start helical outer profile due to the winding wire can rotate as a whole relative to the carrier once the effective adhesive forces between the wire and the carrier material are overcome.

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

To achieve this purpose, according to the present invention, a carrier for a bristle insert is provided, wherein the bristle insert is formed by two wire segments intertwined with each other, wherein the carrier has a guide opening and an embedding surface, the cross-section of the guide opening is larger than the cross-section of the intertwined wire of the bristle insert to be mounted on the carrier, and the embedding surface can be approached in a longitudinal direction lateral to the guide opening, in particular perpendicular to the guide opening. To solve this object, a brush having such a carrier and a bristle insert fixed in the carrier is also provided, wherein the bristle insert comprises two wire sections intertwined with each other, the wire sections sandwiching a plurality of bristles between the wire sections in the bristle portion, and forming an anchoring portion in the bristle-free portion, the anchoring portion being accommodated in the carrier and fixed there, characterized in that the anchoring portion comprises a bent portion in which the anchoring portion extends in at least one direction different from the longitudinal direction, and the anchoring portion is embedded in the material of the carrier so that more than 50% of the cross section of the anchoring portion is located below the height of the embedding surface. To solve this object, a method is finally provided, wherein firstly such a carrier is provided. The anchoring portion of the bristle insert is then inserted into the guide opening of the carrier until the anchoring portion is opposite to the embedding surface. The ultrasonic generator is then activated and pressed against the anchoring portion, so that the material of the carrier is locally melted and the anchoring portion is pressed into the carrier by the ultrasonic generator, wherein the anchoring portion is plastically deformed by the ultrasonic generator to form the bent portion.

The invention is based on the basic concept that the anchoring part is melted into the carrier by so-called ultrasonic embedding and thereby plastically deformed so that it no longer has a continuous straight course. "Melt" here means that the carrier material is softened and/or melted locally in the area in contact with the anchoring area of the bristle insert (due to the vibration energy coupled by the ultrasonic generator) and the anchoring part is pressed deeply into the carrier material so that the widest dimension of the anchoring part observed in cross section (assuming an ideal circular cross section, i.e. the "equator" of the cross section) is below the height of the embedding surface, and the cross section is preferably completely below the height of the embedding surface.

That is, the embedding surface is characterized in that it exists on the carrier before the bristle insert is installed (that is, it is not formed in the material after the material is subsequently injected), and the embedding surface is plastically deformed by the anchoring area, so that the anchoring area is embedded in the carrier material (and not only slightly deformed locally due to the mechanical pressure exerted by the anchoring area on the carrier surface).

Such a connection between the anchoring part and the carrier body results in various advantages. On the one hand, very high cycle rates can be achieved, since the energy required for local melting of the carrier material can be introduced in a very short time by means of the ultrasound generator, since the anchoring part itself does not have to be heated. It is therefore not necessary to tether the bristle insert and the carrier body together or to hold them together until the carrier material has cooled down again, since the energy introduced is so small that the material is sufficiently cool again almost immediately after switching off the ultrasound generator; the wire acts as a heat sink. The time for fixing the anchoring part to the carrier body is less than one second, and in particular is in the range of a fraction of a second. By deforming the anchoring part, an anti-twist protection is formed, which ensures that the wire can no longer "screw out" of the carrier body. The remaining undeformed portion of the anchoring part then forms the pull-out prevention device. Since a large part or even the entire cross-section of the anchoring part is embedded in the carrier, an overall high holding force is generated.

The embedding surface can be flat, and the curved portion of the anchoring part can be designed as a concave "dent", which is pressed into the carrier material by the ultrasonic generator. For this purpose, the ultrasonic generator preferably has a protrusion, which locally deforms the anchoring part into a curved portion, which is embedded in the carrier material. The advantage of this embodiment is that the embedding surface of the carrier can be designed without undercuts.

It is also possible to arrange that the embedding surface has a concave recess. When the ultrasonic generator is pressed against the anchoring part, the anchoring part is deformed into the recess by the ultrasonic generator. The advantage of this design is that no carrier material needs to be squeezed out to accommodate the curved part (except for a small amount of material that must be squeezed out when embedding the anchoring part).

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

According to one embodiment of the present invention, the embedding surface is the bottom of the narrow slot. The side wall of the slot guides the anchoring portion, so that even if the width of the ultrasonic generator is very small, the ultrasonic generator can be reliably passed through the slot and pressed on the anchoring portion.

The slot can extend straight in the same direction as the guide opening. This makes it easier to insert the anchoring part into the slot and embed it on the surface.

It can also be provided that the slot extends in a curved manner. Here, before the anchoring part is pressed into the embedding surface by the ultrasonic generator, the anchoring part is deformed relative to its straight initial shape. Due to the curved course of the anchoring part, it is no longer necessary to deform the anchoring part locally in order to obtain the desired protection against unscrewing.

The width of the slot is preferably less than 2 mm, particularly preferably less than 1 mm. In the case of this small width, it is not necessary to subsequently close the slot, since the narrow slot does not affect the usability of the brush.

According to an alternative embodiment, it is provided that the embedding surface is a wide channel bottom. This enables the use of a wider ultrasonic generator to press the anchoring part into the embedding surface. If necessary, a closing part must be provided to seal the carrier toward the outside.

According to another alternative embodiment, the embedding surface is arranged below a plurality of mutually separated through-holes. In this technical solution, the embedding surface is invisible or almost invisible from the outside; the through-holes can be made very small so that they are considered as part of the design.

Polypropylene is particularly suitable as a carrier material because it can be injection molded well and can be melted by the energy introduced by the ultrasonic generator.

The guide opening preferably has a circular cross section so that the anchoring part of the bristle insert can be reliably guided. However, other cross sections are also possible in principle. The guide opening can also be designed as a slot, which guides the anchoring part laterally in such a way that the guide opening is located at the desired position on the embedding surface.

When a closed guide opening is used, the following advantages result: the guide portion keeps away from the anchor portion any loads which would attempt to pull the anchor portion "upwards" out of the embedding surface. If the guide opening is designed as a slot, it is preferred to take precautions to prevent the stripping force from acting on the anchor portion 14. The slot should extend in a direction that prevents the anchor portion from being pulled out of the embedding surface (e.g. parallel to the embedding surface), or the slot is subsequently closed with a cover or the like, thereby forming a closed guide opening.

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

Figures 1a and 2a illustrate a bristle insert 10 and a carrier 20 which, when joined together, form a brush. Here, a makeup brush, a mascara brush or an interdental brush.

The bristle insert 10 consists of a wire that is bent in the middle, thereby obtaining two parts of equal length. These two parts are intertwined with each other. Here, a large number of bristles are introduced in one area between the two wire sections that are intertwined with each other, so that the bristles are sandwiched between the wire sections.

The bristles form a bristle portion 12. Outside the bristle portion 12, the wound wire section is free of bristles.

The end of the wound wire opposite to the bristle portion 12 forms an anchor portion 14, which is used to be firmly connected to the carrier 20.

The carrier 20 is made of plastic and includes a gripping portion 22 and a guiding portion 24 .

A narrow groove 26 is provided in the gripping portion 22, and the narrow groove 26 extends in a multi-bend manner in a top view, that is, in a wave shape.

The slot 26 transitions, on the side of the slot 26 facing the guide portion, into a guide opening 28 extending through the guide portion 24 .

The slot 26 extends from the outside of the gripping portion into the interior of the carrier 20. The bottom surface of the slot 26 forms an embedding surface 30. Due to the slot 26, the embedding surface 30 can be approached from the side (relative to the longitudinal direction of the guide opening 28), in particular, from a direction perpendicular to the longitudinal direction of the guide opening 28.

The embedding surface 30 is located at the same height as the guide opening 28 (more precisely, at the same height as the portion of the wall of the guide opening 28 that faces away from the side of the carrier 20 where the slot 26 forms an outward exit). That is, the guide opening 28 transitions directly and smoothly into the embedding surface 30.

When the anchoring portion 14 of the bristle insert 10 is pushed into the guide opening 28, the anchoring portion 14 reaches the narrow groove 26. When pushed further, the anchoring portion 14 slides along the embedding surface 30, wherein the anchoring portion takes on the wavy shape of the narrow groove 26.

1 b and 2 b show a second embodiment of a carrier 20. The same symbols are used for the components known from the above embodiments and in this respect reference is made to the above description.

The difference from the first embodiment is that the slot 26 does not extend in a curved manner, but extends straight and is in the extension of the guide opening 28.

A further embodiment is illustrated in Figure 3. The same symbols are used for the components known from the above embodiments and in this respect reference is made to the above description.

The difference from 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 greater than 100% of the diameter of the anchoring portion 14 of the bristle insert 10. The width of the recess 32 (measured perpendicularly to the insertion direction and perpendicularly to the depth direction) corresponds to the width of the slot 26 adjacent to the recess and the width of the embedding surface 30.

In order to prevent the anchoring part 14 from getting caught on the edge of the recess 32 , a chamfer 34 is provided at the transition to the embedding surface 30 .

With reference to FIGS. 4a to 4e, it is generally explained below how the bristle insert 10 is fixed to the carrier 20. Here too, the same symbols are used for the components known from FIGS. 1 to 3, and reference is made to the above description in this respect.

In a first step, the bristle insert 10 is pushed with its anchoring part into the carrier (FIG. 4a), more precisely through the guide opening 28 into the slot so that the anchoring part 14 lies on the embedding surface 30 (FIGS. 4b and 4c).

The ultrasonic generator 60 is then pushed into the narrow groove from the outside (Figure 4d) and moved until the ultrasonic generator 60 is placed on the anchoring part 14.

The shape and size of the ultrasonic generator 60 corresponds to the shape and size of the slot 26 (or is slightly smaller) so that the ultrasonic generator is guided onto the anchoring portion 14 of the bristle insert 10.

The ultrasonic generator 60 is activated, thereby transmitting ultrasonic vibrations to the anchoring portion 14. These ultrasonic vibrations cause the material of the carrier 20 to be heated and softened (and at least partially melted) due to friction with the material of the carrier 20. Due to the mechanical pressure applied by the ultrasonic generator 60 on the anchoring portion 14, the anchoring portion 14 is pressed into the flowable material of the carrier 20.

This embedding process continues until the two wire sections of the anchoring part 14 are (at least almost) completely sunk into the carrier. In other words: after being embedded in the material of the carrier, the anchoring part is (at least almost) completely below the embedding surface 30 (see FIG. 4e).

With reference to Figures 5a to 5c, the following describes how the anchoring portion 14 is fixed to a carrier having the recess 32 known from Figures 1b and 2b. The cross-sectional shape of the recess 32 is slightly different from the cross-sectional shape of Figure 3, namely, it is V-shaped.

The bristle insert 10 is pushed into the carrier 20 in the same manner as described with reference to FIGS. 4a to 4c. Here, the frontmost region of the anchoring portion overhangs the recess 32.

The ultrasonic generator 60 used here is provided with a deforming protrusion 62, which partially presses the anchoring portion 14 into the recess 32 when the ultrasonic generator 60 is pressed against the anchoring portion 14. As a result, a concave curved portion 16 is formed on the anchoring portion 14.

The curved portion 16 is melted/pressed into the material of the carrier 20 by means of an ultrasonic generator in the same manner as the remaining (straight) portion of the anchoring portion 14 .

The bent portion 16 improves the anchoring force exerted by the material of the carrier 20 on the anchoring portion 14. In particular, the bent portion 16 prevents the anchoring portion 14 from being able to be twisted out of the material of the carrier 20.

If the slot 26 is very narrow, it is not necessary to close the slot 26. Since the depth of the slot 26 is much greater than the width, the anchoring portion 14 at the bottom of the slot cannot be seen or can hardly be seen.

As an alternative to the method of deforming the anchoring part 14 by means of an ultrasonic generator during embedding, it can be provided that the deformation and embedding/melting steps are carried out successively by means of two different tools. This is particularly applicable in the case of wires that are so thick that it is advantageous to use a tool that is specifically designed and stronger than perhaps the earlier fine ultrasonic generators for deformation.

In this alternative, the anchoring part is pushed onto the embedding surface, then deformed by a die and subsequently melted into the embedding surface by an ultrasonic generator.

An alternative design of a carrier 20 and the connection of a bristle insert 10 to this carrier 20 is described with reference to Figures 6a and 6b. The same symbols are used for the parts known from the above embodiments and reference is made to the above description in this respect.

Here, the embedding surface 30 transitions smoothly into the guide opening 28 without recesses or the like. In the region where the bend 16 is to be produced on the anchoring part 14, the ultrasonic generator 60 is provided with a deforming projection 62. There, when the activated ultrasonic generator 60 is pressed against the anchoring part 14, the anchoring part 14 is deformed so that it penetrates into the material of the carrier 20 and thus assumes a complementary shape to the contour of the deforming projection 62.

Here, the deforming projection 62 is illustrated near the guide opening 28. However, it is also possible to arrange the deforming projection 62 at a greater distance from the guide opening 28. However, it is advantageous to arrange the curved portion as close as possible to the guide opening and therefore as close as possible to the portion of the bristle insert 10 where torque may occur. This ensures that the torque is intercepted by the curved portion and the "rear" part of the anchoring portion is not acted upon by the torque, but is available for transmitting tensile forces.

Another embodiment of a carrier 20 and the resulting slightly different fixing of the connecting part on the carrier are described with reference to Figures 7a and 7b. The same symbols are used for the components known from the above embodiments, and reference is made to the above description in this respect.

The difference from the previous embodiment is that in the embodiment of Figures 7a and 7b, the embedding surface 30 is at a height lower than the height of the guide opening 28. When the anchoring portion 14 is pushed through the guide opening 28, the anchoring portion 14 is first exposed above the embedding surface 30.

When the ultrasonic generator 60 is pressed onto the anchoring part 14, it first presses the anchoring part 14 down onto the embedding surface. Here, the wire is bent at the transition to the bristle insert 10 in the area in the guide opening 28, thereby forming a curved portion 17 there. Unlike the previous embodiment in which the curved portion 16 is concave, the curved portion 17 is inclined in only one direction because it must compensate for the height difference between the guide opening 28 and the embedding surface.

The ultrasonic generator is then activated and the anchoring part 14 is pressed into the flowable material of the carrier 20. Here, the deformation of the curved part 17 is increased, because the curved part 17 now also has to additionally adapt to the embedding depth.

The carrier has an inclined surface in the region where the curved portion 17 is generated. Alternatively, the curved portion 17 itself is self-formed under the action of the ultrasonic generator 60.

If a wider notch is used instead of the slot, or the slot is closed despite its small width, the notch can be closed again after the anchoring portion 14 is embedded in the material of the carrier 20. Here, a closing member 40 (see FIGS. 8a and 8b) can be used, which is firmly attached to the carrier 20 by ultrasonic welding by means of an ultrasonic generator 70 designed for ultrasonic welding. This corresponds to the embodiment in FIG. 5.

As can be seen in Fig. 7, the closing part 40 can also be welded to a carrier 20 in which the embedding surface 30 is offset relative to the guide opening 28. This is illustrated in Figs. 9a and 9b.

10a to 10d show an alternative embodiment of a carrier 20. The same symbols are used for the components known from the above embodiments and in this respect reference is made to the above description.

The difference between the above embodiment and the embodiment of Figure 10 is that here no narrow groove is provided, by which the ultrasonic generator is pressed on the anchoring part 14, but a wide channel 29 is provided, the bottom of which is the embedding surface 30. Therefore, the closing member is plate-shaped here.

Another embodiment of an ultrasonic generator 60 is shown in Figure 11. The difference from the ultrasonic generator known from Figure 6 is that a deformed protrusion 63 is used which is not V-shaped or pointed but has a rounded contour.

FIG. 12 shows another variation of the ultrasonic generator 60 . The difference from FIG. 11 is that three sharp deformed protrusions 62 are provided here, thereby forming three curved portions which are deeply embedded in the material of the carrier 20 .

In Figures 13 and 14, a carrier body 20 and a bristle insert 10 according to another embodiment are shown. The same symbols are used for the parts known from the above embodiments and reference is made to the above description in this respect.

The difference between the embodiment of the carrier 20 of FIG. 13 and the carriers of the other embodiments is that in the embodiment of FIG. 13 the access to the embedding surface 30 is not through a single slit, but through a plurality of individual (i.e. separated from each other) openings 27. The extension of these openings 27 is similar to the ventilation shaft leading to the tunnel in the mine; the embedding surface 30 is arranged at the bottom of the tunnel for ventilation.

In order to achieve the desired anti-rotation protection for the anchoring part 14 of the bristle insert 10, some of the through-openings 27 are formed so deep that a recess 32 is formed, such as is known from the embodiment of FIG. 3.

FIG. 14 shows the outline of the anchoring part 14 of the bristle insert 10, which is pressed into the embedding surface 30 and fixed there. The anchoring part 14 has two "recesses" corresponding to the two recesses 32 of the anchoring surface. In the initial state, i.e. before the anchoring part 14 is pushed into the carrier and connected to it, the anchoring part extends in a straight line.

FIG. 15 shows an example of an ultrasonic generator 60 by which the anchoring portion 14 is deformed and connected to the embedding surface 30 in a carrier 10 having a plurality of through-holes 27. The ultrasonic generator 60 has a plurality of pins 61, each of which extends through one of the through-holes into the carrier 20 and is pressed against the anchoring portion 14 there. The pins 61 are designed to have an appropriate length, that is, longer where the recesses 32 are provided.

In contrast to the above-described embodiment in which the ultrasonic generator 60 continuously presses the anchoring part 14 into the embedding surface 30, here a plurality of mutually separated locations are formed at which the anchoring part 14 is connected to the material of the carrier 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 the bristle insert 10 is connected to a carrier body 20 having a plurality of separate openings 27 .

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

Subsequently, the anchoring portion 14 is heated by an ultrasonic generator 60 as shown in FIG. 15 , and the anchoring portion 14 is pressed against the material of the carrier 20, wherein the anchoring portion is plastically deformed due to the presence of the recess 32 (see FIGS. 16c and 16d ). In addition, similar to the embodiment of FIGS. 7a and 7b , a curved portion 17 is formed, which meets the height difference between the guide opening 28 and the embedding surface 30.

Since the openings 27 have a very small cross-section, it is not necessary to close the openings 27 with separate closing members.

In Figures 17a to 17d, different variations of the brush are shown, in which in addition to the openings 27 there are a plurality of small recesses 80. The recesses serve to increase the grip. Each recess 80 has a cross section corresponding to the cross section of the opening 27. The opening 27 thus differs from the recess 80 only by its depth; the anchoring portion 14 is visible on the bottom of the recess. However, since the cross section of the openings is very small, it is not necessary to close them; they are hardly recognizable as recesses in the cluster of recesses 80.

10: Bristle insert 12: Bristle portion 14: Anchor portion 16: Bend portion 17: Bend portion 20: Carrier 22: Grip portion 24: Guide portion 26: Slot 27: Through hole 28: Guide opening 30: Insert surface 32: Recess 34: Chamfer 40: Closing member 60: Ultrasonic generator 61: Pin 62: Deformed protrusion 63: Deformed protrusion 70: Ultrasonic generator 80: Recess

The present invention is described below with reference to different embodiments illustrated in the accompanying drawings. In these drawings:

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

FIG. 1 b illustrates a top view of a carrier according to a second embodiment having a bristle insert to be attached to the carrier;

FIG. 2a shows the carrier and bristle insert of FIG. 1a in a perspective cross-sectional view;

FIG. 2b shows the carrier and bristle insert of FIG. 1b in perspective;

FIG. 3 illustrates a cross-sectional view of a carrier according to a third embodiment, the carrier having a bristle insert to be mounted on the carrier;

Figures 4a to 4e schematically illustrate different steps of attaching a bristle insert to a carrier, and an enlarged cross section of a carrier having an anchoring portion embedded in the carrier;

Figures 5a to 5c illustrate different steps of attaching the bristle insert to a carrier formed similar to the carrier of Figure 3;

FIGS. 6a and 6b schematically illustrate the installation of a bristle insert according to an alternative embodiment onto a carrier.

Figures 7a and 7b schematically illustrate the installation of a bristle insert according to a further embodiment onto a carrier.

Figures 8a and 8b show two steps of mounting the closing member on the carrier of Figure 5;

Figures 9a and 9b show two steps of mounting the closing member on the carrier of Figure 7;

Figures 10a to 10d show in side and top view the attachment of a closure member according to a further embodiment to a carrier and the completed brush;

FIG. 11 schematically illustrates the attachment of a bristle insert to an ultrasonic generator according to yet another technical solution;

FIG. 12 schematically illustrates the attachment of a bristle insert to an ultrasonic generator according to yet another technical solution;

FIG. 13 is a cross-sectional view of a carrier according to yet another embodiment;

FIG. 14 shows in side view the bristle insert anchored in the carrier of FIG. 13;

FIG. 15 illustrates an ultrasonic generator for fixing the bristle insert of FIG. 14 in the carrier of FIG. 13;

Figures 16a to 16d illustrate in side view, two schematic views and a cross-sectional view different steps for fixing the bristle insert in a carrier similar to the embodiment in Figure 13; and

Figures 17a to 17d illustrate different variations of a brush according to another technical solution, wherein the carrier is based on the implementation of Figure 13.

Domestic storage information (please note in the order of storage institution, date, and number) None Foreign storage information (please note in the order of storage country, institution, date, and number) None

10: Bristle insert

12: Brush part

14: Anchoring part

20: Carrier

26: Slot

30: Embedded surface

60: Ultrasound generator

62: Deformed bulge

Claims (22)

A carrier (20) for a bristle insert (10) formed by two wire sections intertwined with each other, wherein the carrier (20) has a guide opening (28) and an embedding surface (30), the guide opening (28) having a cross-section greater than the cross-section of the intertwined wire of the bristle insert (10) to be mounted on the carrier (20), and the embedding surface (30) can be approached in a direction lateral to a longitudinal direction of the guide opening (28), in particular perpendicular to the longitudinal direction of the guide opening. The carrier (20) as described in claim 1, wherein the embedding surface (30) is flat. The carrier (20) as described in claim 1, wherein the embedding surface (30) is configured to be offset from the guide opening (28). The carrier (20) as described in claim 3, wherein the embedding surface (30) includes: at least one portion extending longitudinally obliquely relative to the guide opening (28). The carrier (20) as described in claim 1, wherein the embedding surface (30) comprises: a concave recess (32). A carrier (20) as described in any one of claims 1 to 5, wherein the embedding surface (30) is a bottom of a narrow slot (26). The carrier (20) as described in claim 6, wherein the narrow slot (26) extends straight in the same direction as the guide opening (28). The carrier (20) as described in claim 7, wherein the narrow slot (26) extends in a curved manner. The carrier (20) as described in claim 6, wherein the width of the narrow slot (26) is less than 2 mm, preferably less than 1 mm. A carrier (20) as described in any one of claims 1 to 5, wherein the embedding surface (30) is a bottom of a wide channel. A carrier (20) as described in any one of claims 1 to 5, wherein the embedding surface (30) is arranged below a plurality of openings (27) separated from each other. The carrier (20) as described in any one of claims 1 to 5, wherein the carrier (20) is made of polypropylene. A carrier (20) as described in any one of claims 1 to 5, wherein the guide opening (28) has a circular cross-section. The carrier (20) as claimed in claim 13, wherein the cross-sectional area of the guide opening (28) is less than 2 mm ² , in particular less than 1 mm ² . A brush having a carrier (20) according to one of claims 1 to 14 and a bristle insert (10) fixed in the carrier (20), wherein the bristle insert (10) comprises two wire sections intertwined with each other, the wire sections sandwich a plurality of bristles between the wire sections in a bristle portion (12), and form an anchoring portion (14) in a portion without bristles, the anchoring portion (14) being accommodated in the carrier The anchoring portion (14) is fixed in a carrier (20), characterized in that the anchoring portion (14) includes a curved portion (16; 17), in which the anchoring portion (14) extends in at least one direction different from the longitudinal direction, and the anchoring portion (14) is embedded in the material of the carrier (20), so that more than 50% of the cross-section of the anchoring portion (14) is located below a height of the embedding surface (30). A brush as claimed in claim 15, wherein the bent portion is a deflection portion (17) such that a height of the anchor portion (14) relative to the guide opening (28) is offset by more than 200% of a straight diameter of the anchor portion (14). A brush as described in claim 15, wherein the curved portion (16) is concave. A brush as claimed in any one of claims 15 to 17, wherein a closing part (40) is provided, the closing part (40) being attached to the carrier (20) and closing a passage leading to the embedding surface (30). A method for manufacturing a brush as claimed in any one of claims 15 to 18, the method comprising the following steps: - providing a carrier (20) as claimed in any one of claims 1 to 13, - inserting the anchoring portion (14) of the bristle insert (10) into the guide opening (28) until the anchoring portion (14) is opposite to the embedding surface (30), - an ultrasonic generator (60) is activated and pressed onto the anchoring portion (14) so that the material of the carrier (20) is locally melted and the anchoring portion (14) is pressed into the carrier (20) by the ultrasonic generator (60), wherein the anchoring portion (14) is plastically deformed by the ultrasonic generator (60) to form the curved portion (16; 17). A method as claimed in claim 19, wherein the anchoring portion (14) is plastically deformed by the ultrasonic generator (60) until the anchoring portion (14) lies flat against the embedding surface (30). A method as claimed in claim 19 or claim 20, wherein the anchoring portion (14) is locally pressed into a recess (32) of the embedding surface (30) by the ultrasonic generator (60). A method as described in claim 19 or claim 20, wherein the anchoring portion (14) is partially deformed by the ultrasonic generator (60), and a bent portion (16) formed thereby melts a recess in the carrier (20).