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EP1142505B1 - Method of brush manufacture - Google Patents

Method of brush manufacture Download PDF

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Publication number
EP1142505B1
EP1142505B1 EP01107718A EP01107718A EP1142505B1 EP 1142505 B1 EP1142505 B1 EP 1142505B1 EP 01107718 A EP01107718 A EP 01107718A EP 01107718 A EP01107718 A EP 01107718A EP 1142505 B1 EP1142505 B1 EP 1142505B1
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EP
European Patent Office
Prior art keywords
brush body
platelet
recess
ultrasonic welding
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP01107718A
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German (de)
French (fr)
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EP1142505A3 (en
EP1142505A2 (en
Inventor
Bart Gerard Boucherie
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GB Boucherie NV
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GB Boucherie NV
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Publication date
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Publication of EP1142505A2 publication Critical patent/EP1142505A2/en
Publication of EP1142505A3 publication Critical patent/EP1142505A3/en
Application granted granted Critical
Publication of EP1142505B1 publication Critical patent/EP1142505B1/en
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    • AHUMAN NECESSITIES
    • A46BRUSHWARE
    • A46DMANUFACTURE OF BRUSHES
    • A46D3/00Preparing, i.e. Manufacturing brush bodies
    • A46D3/04Machines for inserting or fixing bristles in bodies

Definitions

  • the invention relates to a method for connecting plastic tufts provided with bristle tufts with brush bodies, in particular the same, plastic by means of ultrasonic welding or gluing.
  • US 5 217 279 discloses a method of joining a bristle tuft to the hollow, for example, tubular end of a holder.
  • a bristle tuft is folded around a plastic fiber, which in turn is bent in the opposite direction. With the free ends of the plastic fiber, the tuft is pushed into the opening of the holder. For insertion, the free ends of the plastic fibers are compressed. The restoring force of the fiber provides anchoring in the tubular end of the holder. If a higher fastening force is required, the plastic fiber can be connected to the preferably also made of plastic tubular end of the holder by ultrasonic welding together.
  • BE 10 09 925 A discloses brushes, including toothbrushes, which are composed of individual lamellae. Each lamella has an edge, which is formed in numerous tips. These tips form the bristles of the later brush.
  • the individual slats are connected to each other, for example by ultrasonic welding.
  • a method for the production of brushes in which the bristles are made of thermoplastic material, melted at one end and provided with shortening their length with a flat foot.
  • the brush body is designed as a hollow body having at least one opening. This opening is closed with the flat foot of the molten bristles. For this purpose, the foot is formed in register and melted onto the opening or on an inner step along the opening.
  • the connection between the plastics of the small plate and the brush body takes place by ultrasonic welding.
  • a to the Brush body-facing edge formed which acts as an energy concentrator during ultrasonic welding.
  • the welding is therefore carried out with high precision, so that the plate can be fixed in register with the brush body even in mass production, such as toothbrushes.
  • the edge is formed such that it tapers towards the brush body.
  • the brush body is provided with a recess into which the wafer can be inserted in register. The remaining between the outer edge of the plate and the boundary of the recess gap is then very small and barely perceptible.
  • the edge is brought to rest at its tapered end at the bottom of the recess, so that the welded connection is formed at the bottom of the recess.
  • the plate is pressed against the bottom of the recess of the brush body.
  • a projection projecting beyond the recess of the brush body is preferably formed.
  • This approach may extend over the entire circumference of the platelet, or even over a portion thereof, preferably over that portion which extends into the neck of the brush body in a toothbrush. At this point, bending stresses occur which open a gap remaining between the plate and the brush body when the head of the toothbrush is bent back in use.
  • This approach is also preferably provided with a pointing towards the brush body, tapered edge, which acts as an energy concentrator in ultrasonic welding.
  • An approximately remaining between the plate and the brush body gap can be closed by post-processing, in particular by filling with a suitable plastic compound.
  • the already equipped with the platelets brush body can be introduced into an injection mold with which an encapsulation is placed over the gap to completely fill and close this.
  • the wafer is inserted in register in a recess of the brush body and fixed there by means of an adhesive.
  • a gap remaining between the plate and the brush body can be closed by injection-molding in an injection mold.
  • the platelets are secured to the brush body by a combination of ultrasonic welding and gluing.
  • the load-bearing attachment of the plate can be carried out by welding at the bottom of the recess of the brush body, while the adhesive is introduced into the gap remaining between the plate and brush body and fills it.
  • a recess 12 is formed in the head region of a toothbrush body 10.
  • a carrier plate 14 is inserted appropriately.
  • the carrier plate 14 is provided with a number of through holes, wherein bristle tufts 16 are inserted and fixed.
  • an edge 18 is formed, which tapers towards the bottom of the recess 12.
  • the brush body 10 and the plate 14 are preferably made of the same plastic, such as polypropylene.
  • the welding is done with high precision, so that a very precise fit arrangement of the plate 14 is ensured on the brush body 10.
  • this gap may increase in the use of a toothbrush due to the bending stress occurring.
  • the platelet 14 is provided with a projection 14a, which extends into the neck region of the brush body.
  • the projection 14a is provided on its side facing the brush body with a tapered edge 14b, which acts as an energy concentrator during ultrasonic welding.
  • the recess 12 is provided with a stepped edge on the peripheral shape and the plate 14 with a mating formed peripheral edge.
  • a peripheral edge 14c is formed on the plate 14, which protrudes beyond the main body of the plate and is brought with a tapered edge on the recess 12 surrounding surface of the brush body 10 for support.
  • ultrasonic welding also takes place over the entire circumference of the small plate 14.
  • the plate 14 is pressed after the welding process to the brush body 10 and brought into close contact with this over the entire circumference, so that no gap is formed at the transition between the plate 14 and the brush body 10.
  • the recess 12 is provided with an oblique peripheral wall converging toward the interior of the brush body 10.
  • the plate 14 is provided with a matching oblique peripheral wall, so that a gap-free fit of the plate is ensured in the recess of the brush body.
  • the plate may additionally be provided with a tapered edge for the fixed welding at the bottom of the recess 12.
  • a gap remaining approximately between the wafer and the brush body can be closed by filling with a plastic compound. It is particularly useful to fill this gap by injection molding in an injection mold with plastic material.
  • the plate on the brush body receives an all-round elastic support, which can be used to dampen vibrations occurring in use.
  • connection of the plate 14 with the brush body 10 may alternatively or additionally be effected by an adhesive.
  • the adhesive may also or additionally have the function of filling a gap remaining between the plate and the brush body and thus eliminating it.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Brushes (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)

Abstract

To bond bristles to the heads of brushes, where the bristle tufts (16) are mounted on platelets (14) of plastics and the same material as the brush body (10), an edge is formed around the platelets. As the platelet is bonded to the brush head by ultrasonic welding, the shaped edge acts as an energy concentrator. The shaped edge tapers (18) towards the brush body, to lie at the base of the opening (12) formed in the brush body to hold the platelet with the bristles in a shaped fit. The outer contour of the bristle platelet is shaped to form a shoulder over the rim of the opening in the brush body to hold the bristle platelet, and lie on the surface surrounding the opening. Or the peripheral shoulder around the platelet can lie within a recess around the opening, to lie flush with the brush body surface. The platelet peripheral shoulder extends as far as the transit zone of the brush body, forming the neck piece of a toothbrush. A press unit holds the platelet of bristle tufts against the brush body during ultrasonic welding. The gap between the bristle platelet and the brush body is filled with a plastics mass in an injection mold, where the plastics mass is injected into the gap. The ultrasonic welding unit is combined with an adhesive applicator. The opening in the brush body, to accommodate the platelet with the bristle tufts, has a peripheral wall which converges inwards. The peripheral wall of the bristle platelet is angled to fit into the opening wall, and is bonded in place by ultrasonic welding or an adhesive.

Description

Die Erfindung betrifft ein Verfahren zum Verbinden von mit Borstenbüscheln versehenen Plättchen aus Kunststoff mit Bürstenkörpern aus, insbesondere demselben, Kunststoff mittels Ultraschallschweißen oder Verklebung.The invention relates to a method for connecting plastic tufts provided with bristle tufts with brush bodies, in particular the same, plastic by means of ultrasonic welding or gluing.

Bei der Bürstenherstellung ist es bekannt, Borstenbüschel an Trägerplättchen zu befestigen, die dann an einem Bürstenkörper befestigt werden. Die Befestigung der Trägerplättchen an den Bürstenkörpern kann durch Verschweißen erfolgen, insbesondere dann, wenn Trägerplättchen und Bürstenkörper aus demselben Kunststoff bestehen. Am Übergang zwischen dem Trägerplättchen und der Oberfläche des Bürstenkörpers kann ein Spalt entstehen, der aus ästhetischen, aber auch aus hygienischen Gründen unerwünscht ist.In brush manufacture, it is known to attach bristle tufts to carrier plates, which are then attached to a brush body. The attachment of the carrier plate to the brush bodies can be effected by welding, in particular when carrier plate and brush body made of the same plastic. At the transition between the carrier plate and the surface of the brush body, a gap may arise, which is undesirable for aesthetic, but also for hygienic reasons.

US 5 217 279 offenbart ein Verfahren zum Verbinden eines Borstenbüschels mit dem hohlen, beispielsweise rohrförmigen Ende eines Halters. Dazu wird ein Borstenbüschel um eine Plastikfiber gefaltet, die ihrerseits in entgegengesetzter Richtung gebogen ist. Mit den freien Enden der Plastikfiber wird das Büschel in die Öffnung des Halters geschoben. Zum Einführen werden dabei die freien Enden der Plastikfiber zusammengedrückt. Die Rückstellkraft der Fiber sorgt für eine Verankerung im rohrförmigen Ende des Halters. Ist eine höhere Befestigungskraft gefordert, so kann die Plastikfiber mit dem vorzugsweise ebenfalls aus Plastik bestehenden rohrförmigen Ende des Halters per Ultraschallschweißen miteinander verbunden werden.US 5 217 279 discloses a method of joining a bristle tuft to the hollow, for example, tubular end of a holder. For this purpose, a bristle tuft is folded around a plastic fiber, which in turn is bent in the opposite direction. With the free ends of the plastic fiber, the tuft is pushed into the opening of the holder. For insertion, the free ends of the plastic fibers are compressed. The restoring force of the fiber provides anchoring in the tubular end of the holder. If a higher fastening force is required, the plastic fiber can be connected to the preferably also made of plastic tubular end of the holder by ultrasonic welding together.

BE 10 09 925 A offenbart Bürsten, unter anderem Zahnbürsten, die aus einzelnen Lamellen zusammengesetzt sind. Jede Lamelle weist dabei einen Rand auf, der in zahlreichen Spitzen ausgeformt ist. Diese Spitzen bilden bei der späteren Bürste die Borsten. Die einzelnen Lamellen werden beispielsweise durch Ultraschallschweißen miteinander verbunden.BE 10 09 925 A discloses brushes, including toothbrushes, which are composed of individual lamellae. Each lamella has an edge, which is formed in numerous tips. These tips form the bristles of the later brush. The individual slats are connected to each other, for example by ultrasonic welding.

In der DE 37 12 962 ist ein Verfahren zur Herstellung von Bürsten offenbart, bei dem die Borsten aus thermoplastischem Kunststoff gefertigt sind, an einem Ende aufgeschmolzen und unter Verkürzung ihrer Länge mit einem flächigen Fuß versehen werden. Der Bürstenkörper ist als Hohlkörper ausgeführt, der mindestens eine Öffnung aufweist. Diese Öffnung wird mit dem flächigen Fuß der aufgeschmolzenen Borsten verschlossen. Dazu wird der Fuß paßgenau geformt und auf die Öffnung bzw. auf eine innenliegende Stufe entlang der Öffnung aufgeschmolzen.In DE 37 12 962 a method for the production of brushes is disclosed in which the bristles are made of thermoplastic material, melted at one end and provided with shortening their length with a flat foot. The brush body is designed as a hollow body having at least one opening. This opening is closed with the flat foot of the molten bristles. For this purpose, the foot is formed in register and melted onto the opening or on an inner step along the opening.

Durch die Erfindung wird ein Verfahren zur Verfügung gestellt, mit dem eine zuverlässige Verbindung zwischen Trägerplättchen und Bürstenkörper gewährleistet wird, ohne daß ein unerwünscht großer Spalt zwischen Trägerplättchen und Bürstenkörper verbleibt.By the invention, a method is provided, with which a reliable connection between the carrier plate and brush body is ensured without an undesirably large gap between the carrier plate and brush body remains.

Gemäß einer ersten Lösung der Erfindung erfolgt die Verbindung zwischen den Kunststoffen des Plättchens und des Bürstenkörpers durch Ultraschallschweißen. Am Umfangsrand des Plättchens wird eine zu dem Bürstenkörper weisende Kante geformt, die beim Ultraschallschweißen als Energie-Konzentrator wirkt. Die Verschweißung erfolgt daher mit hoher Präzision, so daß das Plättchen auch bei Massenfertigung, wie beispielsweise bei Zahnbürsten, paßgenau an dem Bürstenkörper befestigt werden kann. Vorzugsweise wird die Kante derart ausgebildet, dass sie sich zum Bürstenkörper hin verjüngt. Vorteilhaft ist eine Ausführungsform des Verfahrens, bei der der Bürstenkörper mit einer Ausnehmung versehen wird, in die das Plättchen paßgenau eingesetzt werden kann. Der zwischen dem Außenrand des Plättchens und der Berandung der Ausnehmung verbleibende Spalt ist dann sehr klein und kaum wahrnehmbar.According to a first solution of the invention, the connection between the plastics of the small plate and the brush body takes place by ultrasonic welding. At the peripheral edge of the plate is a to the Brush body-facing edge formed, which acts as an energy concentrator during ultrasonic welding. The welding is therefore carried out with high precision, so that the plate can be fixed in register with the brush body even in mass production, such as toothbrushes. Preferably, the edge is formed such that it tapers towards the brush body. Advantageous is an embodiment of the method in which the brush body is provided with a recess into which the wafer can be inserted in register. The remaining between the outer edge of the plate and the boundary of the recess gap is then very small and barely perceptible.

Bei dieser Ausführungsform des Verfahrens wird die Kante an ihrem verjüngten Ende am Boden der Ausnehmung zur Auflage gebracht, so daß die Schweißverbindung am Boden der Ausnehmung entsteht. Beim Schweißprozeß wird das Plättchen gegen den Boden der Ausnehmung des Bürstenkörpers gedrückt.In this embodiment of the method, the edge is brought to rest at its tapered end at the bottom of the recess, so that the welded connection is formed at the bottom of the recess. In the welding process, the plate is pressed against the bottom of the recess of the brush body.

Am Umfangsrand des Plättchens wird vorzugsweise ein über die Ausnehmung des Bürstenkörpers hinausstehender Ansatz gebildet. Dieser Ansatz kann sich über den gesamten Umfang des Plättchens erstrecken oder auch nur über einen Teil desselben, vorzugsweise über denjenigen Teil, der bei einer Zahnbürste bis in das Halsstück des Bürstenkörpers hineinreicht. An dieser Stelle treten Biegebeanspruchungen auf, durch die ein etwa zwischen Plättchen und Bürstenkörper verbleibender Spalt geöffnet wird, wenn der Kopf der Zahnbürste im Gebrauch zurückgebogen wird. Auch dieser Ansatz wird vorzugsweise mit einer gegen den Bürstenkörper weisenden, sich verjüngenden Kante versehen, die beim Ultraschallschweißen als Energie-Konzentrator wirkt.At the peripheral edge of the platelet, a projection projecting beyond the recess of the brush body is preferably formed. This approach may extend over the entire circumference of the platelet, or even over a portion thereof, preferably over that portion which extends into the neck of the brush body in a toothbrush. At this point, bending stresses occur which open a gap remaining between the plate and the brush body when the head of the toothbrush is bent back in use. This approach is also preferably provided with a pointing towards the brush body, tapered edge, which acts as an energy concentrator in ultrasonic welding.

Ein etwa noch zwischen dem Plättchen und dem Bürstenkörper verbleibender Spalt kann durch Nachbearbeitung geschlossen werden, insbesondere durch Ausfüllen mit einer geeigneten Kunststoffmasse. Insbesondere kann der schon mit dem Plättchen bestückte Bürstenkörper in eine Spritzgußform eingebracht werden, mit der eine Umspritzung über den Spalt gelegt wird, um diesen vollständig auszufüllen und zu schließen.An approximately remaining between the plate and the brush body gap can be closed by post-processing, in particular by filling with a suitable plastic compound. In particular, the already equipped with the platelets brush body can be introduced into an injection mold with which an encapsulation is placed over the gap to completely fill and close this.

Bei einer alternativen Ausführungform des erfindungsgemäßen Verfahrens wird das Plättchen paßgenau in eine Ausnehmung des Bürstenkörpers eingesetzt und dort mittels eines Klebers befestigt. Auch bei dieser Ausführungsform des Verfahrens kann ein etwa zwischen Plättchen und Bürstenkörper verbleibender Spalt durch Umspritzen in einer Spritzgußform geschlossen werden.In an alternative embodiment of the method according to the invention, the wafer is inserted in register in a recess of the brush body and fixed there by means of an adhesive. In this embodiment of the method as well, a gap remaining between the plate and the brush body can be closed by injection-molding in an injection mold.

Bei einer weiteren Ausführungform der Erfindung werden die Plättchen durch eine Kombination von Ultraschallschweißen und Kleben an dem Bürstenkörper befestigt. Insbesondere kann die lasttragende Befestigung des Plättchens durch Verschweißung am Boden der Ausnehmung des Bürstenkörpers erfolgen, während der Kleber in den zwischen Plättchen und Bürstenkörper verbleibenden Spalt eingebracht wird und diesen ausfüllt.In a further embodiment of the invention, the platelets are secured to the brush body by a combination of ultrasonic welding and gluing. In particular, the load-bearing attachment of the plate can be carried out by welding at the bottom of the recess of the brush body, while the adhesive is introduced into the gap remaining between the plate and brush body and fills it.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung mehrerer Ausführungsformen des Verfahrens und aus der Zeichnung, auf die Bezug genommen wird. In der Zeichnung zeigen:

  • Figur 1 schematisch eine Schnittansicht durch den Kopfbereich einer in dem erfindungsgemäßen Verfahren hergestellten Zahnbürste;
  • Figur 2 eine Draufsicht auf den Kopfbereich der Zahnbürste nach Fig. 1;
  • Figur 3 eine schematische Schnittansicht einer im Gebrauch durch Biegebeanspruchung verformten Zahnbürste;
  • Figur 4 eine vergrößerte Schnittansicht durch den Kopfbereich einer Zahnbürste, die in einer bevorzugten Ausführungsform des Verfahrens hergestellt wird;
  • Figur 5 eine Detailansicht des in Fig. 4 gezeigten Plättchens;
  • Figur 6 eine Draufsicht auf den Kopf einer Zahnbürste nach Figur 4; und
  • Figuren 7 bis 12 Schnitt- bzw. Teilansichten von Zahnbürsten, die in mehreren Ausführungsvarianten des Verfahrens herstellbar sind.
Further features and advantages of the invention will become apparent from the following description of several embodiments of the method and from the drawings, to which reference is made. In the drawing show:
  • FIG. 1 shows schematically a sectional view through the head region of a toothbrush produced in the method according to the invention;
  • Figure 2 is a plan view of the head portion of the toothbrush of Fig. 1;
  • Figure 3 is a schematic sectional view of a toothbrush deformed in use by bending stress;
  • Figure 4 is an enlarged sectional view through the head portion of a toothbrush made in a preferred embodiment of the method;
  • Figure 5 is a detail view of the wafer shown in Figure 4;
  • Figure 6 is a plan view of the head of a toothbrush of Figure 4; and
  • FIGS. 7 to 12 are sectional and partial views of toothbrushes which can be produced in several variants of the method.

Bei der in Figur 1 gezeigten Ausführungsform wird im Kopfbereich eines Zahnbürstenkörpers 10 eine Ausnehmung 12 gebildet. In diese Ausnehmung 12 wird ein Trägerplättchen 14 passend eingesetzt. Das Trägerplättchen 14 wird mit einer Anzahl von Durchgangslöchern versehen, worin Borstenbüschel 16 eingesetzt und befestigt werden. Am Umfangsrand des Trägerplättchens 14 wird eine Kante 18 gebildet, die sich zum Boden der Ausnehmung 12 hin verjüngt. Der Bürstenkörper 10 und das Plättchen 14 bestehen vorzugsweise aus demselben Kunststoff, beispielsweise Polypropylen.In the embodiment shown in FIG. 1, a recess 12 is formed in the head region of a toothbrush body 10. In this recess 12, a carrier plate 14 is inserted appropriately. The carrier plate 14 is provided with a number of through holes, wherein bristle tufts 16 are inserted and fixed. At the peripheral edge of the carrier plate 14, an edge 18 is formed, which tapers towards the bottom of the recess 12. The brush body 10 and the plate 14 are preferably made of the same plastic, such as polypropylene.

Die Verschweißung erfolgt mit hoher Präzision, so daß eine sehr paßgenaue Anordnung des Plättchens 14 am Bürstenkörper 10 gewährleistet ist.The welding is done with high precision, so that a very precise fit arrangement of the plate 14 is ensured on the brush body 10.

Dennoch kann ein geringfügiger Spalt zwischen dem Umfangsrand des Plättchens 14 und der dieses umgebenden Oberfläche des Bürstenkörpers 10 verbleiben.Nevertheless, a slight gap between the peripheral edge of the plate 14 and the surrounding surface of the brush body 10 may remain.

Wie in Figur 3 veranschaulicht ist, kann sich dieser Spalt im Gebrauch einer Zahnbürste durch die dabei auftretende Biegebeanspruchung vergrößern.As illustrated in Figure 3, this gap may increase in the use of a toothbrush due to the bending stress occurring.

Dem wird bei der in Figur 4 gezeigten Ausführungsform des Verfahrens vorgebeugt, indem das Plättchen 14 mit einem Ansatz 14a versehen wird, der sich bis in den Halsbereich des Bürstenkörpers erstreckt. Um eine sichere Verschweißung dieses Ansatzes 14a mit dem Bürstenkörper 10 zu gewährleisten, wird auch der Ansatz 14a auf seiner dem Bürstenkörper zugewandten Seite mit einer sich verjüngende Kante 14b versehen, die beim Ultraschallschweißen als Energie-Konzentrator wirkt.This is prevented in the embodiment of the method shown in Figure 4, by the platelet 14 is provided with a projection 14a, which extends into the neck region of the brush body. In order to ensure a secure welding of this approach 14a with the brush body 10, the projection 14a is provided on its side facing the brush body with a tapered edge 14b, which acts as an energy concentrator during ultrasonic welding.

Bei der in Figur 7 gezeigten Ausführungsform wird die Ausnehmung 12 mit einer am Umfangsrand gestuften Form und das Plättchen 14 mit einem dazu passend ausgebildeten Umfangsrand versehen.In the embodiment shown in Figure 7, the recess 12 is provided with a stepped edge on the peripheral shape and the plate 14 with a mating formed peripheral edge.

Bei der in Figur 8 gezeigten Ausführungsform wird an das Plättchen 14 ein Umfangsrand 14c angeformt, der über den Hauptkörper des Plättchens hinaussteht und mit einer sich verjüngenden Kante an der die Ausnehmung 12 umgebenden Oberfläche des Bürstenkörpers 10 zur Auflage gebracht wird. Bei dieser Ausführungsform erfolgt eine Ultraschallverschweißung auch über den gesamten Umfang des Plättchens 14.In the embodiment shown in Figure 8, a peripheral edge 14c is formed on the plate 14, which protrudes beyond the main body of the plate and is brought with a tapered edge on the recess 12 surrounding surface of the brush body 10 for support. In this embodiment, ultrasonic welding also takes place over the entire circumference of the small plate 14.

Bei der in Figur 9 gezeigten Ausführungform des Verfahrens wird das Plättchen 14 nach dem Schweißprozeß an den Bürstenkörper 10 herangedrückt und mit diesem über den gesamten Umfang in enge Verbindung gebracht, so daß am Übergang zwischen Plättchen 14 und Bürstenkörper 10 kein Spalt entsteht.In the embodiment of the method shown in Figure 9, the plate 14 is pressed after the welding process to the brush body 10 and brought into close contact with this over the entire circumference, so that no gap is formed at the transition between the plate 14 and the brush body 10.

Bei der in Figur 10 gezeigten Ausführungsform des Verfahrens wird die Ausnehmung 12 mit einer zum Inneren des Bürstenkörpers 10 konvergierenden schrägen Umfangswand versehen. Das Plättchen 14 wird mit einer dazu passenden schrägen Umfangswand versehen, so daß ein spaltfreier Sitz des Plättchens in der Ausnehmung des Bürstenkörpers gewährleistet ist. Wie bei den zuvor gezeigten Ausfühnmgsformen kann das Plättchen zusätzlich für die Festschweißung am Boden der Ausnehmung 12 mit einer sich verjüngenden Kante versehen werden.In the embodiment of the method shown in FIG. 10, the recess 12 is provided with an oblique peripheral wall converging toward the interior of the brush body 10. The plate 14 is provided with a matching oblique peripheral wall, so that a gap-free fit of the plate is ensured in the recess of the brush body. As with the embodiments shown above, the plate may additionally be provided with a tapered edge for the fixed welding at the bottom of the recess 12.

Wie in den Figuren 11 und 12 gezeigt ist, kann ein etwa zwischen dem Plättchen und dem Bürstenkörper verbleibender Spalt durch Ausfüllen mit einer Kunststoffmasse verschlossen werden. Besonders zweckmäßig ist es, diesen Spalt durch Spritzgießen in einer Spritzgußform mit Kunststoffmasse auszufüllen. Wenn als Kunststoffmasse ein Elastomer gewählt wird, erhält das Plättchen am Bürstenkörper eine allseitige elastische Abstützung, die genutzt werden kann, um im Gebrauch auftretende Schwingungen zu bedämpfen.As shown in Figures 11 and 12, a gap remaining approximately between the wafer and the brush body can be closed by filling with a plastic compound. It is particularly useful to fill this gap by injection molding in an injection mold with plastic material. When an elastomer is selected as the plastic mass, the plate on the brush body receives an all-round elastic support, which can be used to dampen vibrations occurring in use.

Bei allen gezeigten Ausführungsformen kann die Verbindung des Plättchens 14 mit dem Bürstenkörper 10 alternativ oder zusätzlich durch einen Kleber erfolgen. Der Kleber kann auch oder zusätzlich die Funktion haben, einen zwischen Plättchen und Bürstenkörper verbleibenden Spalt auszufüllen und damit zu beseitigen.In all the embodiments shown, the connection of the plate 14 with the brush body 10 may alternatively or additionally be effected by an adhesive. The adhesive may also or additionally have the function of filling a gap remaining between the plate and the brush body and thus eliminating it.

Claims (15)

  1. A method of connecting platelets (14) made of a plastics material and provided with tufts (16) of bristles to brush bodies (10) made of a plastics material, in particular the same plastics material, by means of ultrasonic welding, characterized in that the platelets (14) each have a peripheral rim (14c) facing the brush body (10), and an edge (18) is formed on the peripheral rim and acts as an energy concentrator in ultrasonic welding.
  2. The method according to claim 1, characterized in that the edge (18) tapers towards the brush body (10).
  3. The method according to claim 1 or 2, characterized in that each brush body (10) is provided with a recess (12) into which a platelet (14) is fittingly inserted.
  4. The method according to claims 2 and 3, characterized in that the edge (18) engages the bottom of the recess (12) by its tapered end and the weld joint is produced at the bottom of the recess (12).
  5. The method according to claim 4, characterized in that an extension (14a) projecting beyond the recess (12) of the brush body (10) is formed at the peripheral rim (14c) of the platelet (14).
  6. The method according to claim 5, characterized in that the extension (14a) is made to rest on the surface area of the brush body (10) surrounding the recess (12).
  7. The method according to claim 6, characterized in that the extension (14a) is provided with an edge (14b) which tapers towards the brush body (10) and acts as an energy concentrator in ultrasonic welding.
  8. The method according to claim 5, characterized in that the extension (14a) is inserted into a stepped widened portion of the recess (12) in the brush body (10).
  9. The method according to claim 6, characterized in that the extension (14a) is formed in such a way that it protrudes as far as into a transition region of the brush body (10) which corresponds to the neck piece of a toothbrush.
  10. The method according to any of the preceding claims, characterized in that the platelet (14) is pressed against the brush body (10) during the ultrasonic welding.
  11. The method according to any of the preceding claims, characterized in that a gap left between the platelet (14) and the brush body (10) is closed by a plastics mass.
  12. The method according to any of the preceding claims, characterized in that a gap left between the platelet (14) and the brush body (10) is closed by molding in an injection mold.
  13. The method according to any of the preceding claims, characterized in that part of the brush body (10) with the platelet (14) inserted therein is placed into an injection mold for molding around at least the peripheral region of the platelet (14).
  14. The method according to any of the preceding claims, characterized in that the platelet (14) is attached to the brush body (10) by ultrasonic welding in combination with an adhesive joint.
  15. A method of connecting platelets (14) made of a plastics material and provided with tufts (16) of bristles to brush bodies (10) made of a plastics material, in particular the same plastics material, characterized in that the brush body (10) is provided with a recess (12) having a peripheral wall converging obliquely towards the interior, that the platelet is provided with a peripheral wall matching only the peripheral wall of the recess (12) and is fittingly inserted into the recess (12), and that the platelet (14) is attached in the recess (12) by ultrasonic welding or by means of an adhesive.
EP01107718A 2000-04-06 2001-03-30 Method of brush manufacture Expired - Lifetime EP1142505B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20006311U DE20006311U1 (en) 2000-04-06 2000-04-06 Device for attaching tufts of bristles to brush bodies
DE20006311U 2000-04-06

Publications (3)

Publication Number Publication Date
EP1142505A2 EP1142505A2 (en) 2001-10-10
EP1142505A3 EP1142505A3 (en) 2003-06-11
EP1142505B1 true EP1142505B1 (en) 2006-12-06

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EP01107718A Expired - Lifetime EP1142505B1 (en) 2000-04-06 2001-03-30 Method of brush manufacture

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US (1) US6779851B2 (en)
EP (1) EP1142505B1 (en)
AT (1) ATE347290T1 (en)
DE (2) DE20006311U1 (en)
ES (1) ES2275577T3 (en)

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WO2020257820A1 (en) 2019-06-21 2020-12-24 The Procter & Gamble Company Hole perforation plate for manufacturing of a toothbrush head and part thereof
WO2020257818A1 (en) 2019-06-21 2020-12-24 The Procter & Gamble Company Method for producing a toothbrush head or a part thereof
WO2020257819A1 (en) 2019-06-21 2020-12-24 The Procter & Gamble Company Method for producing a toothbrush head
WO2020257816A1 (en) 2019-06-21 2020-12-24 The Procter & Gamble Company Toothbrush head and part thereof
WO2020257817A1 (en) 2019-06-21 2020-12-24 The Procter & Gamble Company Cleaning element carrier and toothbrush head comprising it

Also Published As

Publication number Publication date
ES2275577T3 (en) 2007-06-16
EP1142505A3 (en) 2003-06-11
US20010050507A1 (en) 2001-12-13
EP1142505A2 (en) 2001-10-10
DE20006311U1 (en) 2001-08-09
ATE347290T1 (en) 2006-12-15
US6779851B2 (en) 2004-08-24
DE50111577D1 (en) 2007-01-18

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