U.S. patent application number 12/488850 was filed with the patent office on 2010-02-25 for brush, particularly toohbrush and method for the manufacture thereof.
This patent application is currently assigned to M + C Schiffer GMBH. Invention is credited to Erwin Buchholz, Tim Juentgen, Juergen Weissenfels.
Application Number | 20100043165 12/488850 |
Document ID | / |
Family ID | 41168668 |
Filed Date | 2010-02-25 |
United States Patent
Application |
20100043165 |
Kind Code |
A1 |
Juentgen; Tim ; et
al. |
February 25, 2010 |
BRUSH, PARTICULARLY TOOHBRUSH AND METHOD FOR THE MANUFACTURE
THEREOF
Abstract
Brush, particularly toothbrush and method for the manufacture
thereof The present invention relates to a brush, particularly a
toothbrush, comprising a brush head carrying bundles of bristles,
and a handle with an injection-molded basic body which comprises a
fastening section extending up to the brush head. To provide a
brush that meets the hygienic standards as much as possible and can
be manufactured in an easy way, it is suggested according to the
invention that the bundles of bristles should be bonded to the
basic body via a casting compound. Furthermore, the present
invention provides a method for manufacturing a brush, particularly
a toothbrush, comprising a brush head carrying bundles of bristles,
and a handle, wherein the bundles of bristles are bonded to a basic
body manufactured by injection molding from a thermoplastic after
demolding of said basic body, and wherein the bond between the
bundles of bristles and the basic body is formed by way of a
casting compound that after its solidification is fastened to the
basic body.
Inventors: |
Juentgen; Tim; (Windhagen,
DE) ; Buchholz; Erwin; (Asbach, DE) ;
Weissenfels; Juergen; (Kescheid/Puescheid, DE) |
Correspondence
Address: |
DARBY & DARBY P.C.
P.O. BOX 770, Church Street Station
New York
NY
10008-0770
US
|
Assignee: |
M + C Schiffer GMBH
Neustadt/Wied
DE
|
Family ID: |
41168668 |
Appl. No.: |
12/488850 |
Filed: |
June 22, 2009 |
Current U.S.
Class: |
15/167.1 ;
15/159.1; 300/21 |
Current CPC
Class: |
A46D 3/045 20130101;
B29L 2031/425 20130101; B29C 45/14385 20130101; A46B 2200/1066
20130101; A46B 3/02 20130101; B29C 45/14467 20130101; A46B 3/06
20130101; B29C 2045/14967 20130101 |
Class at
Publication: |
15/167.1 ;
15/159.1; 300/21 |
International
Class: |
A46B 9/04 20060101
A46B009/04; A46D 3/04 20060101 A46D003/04 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 20, 2008 |
DE |
102008029499.3 |
Claims
1. A brush comprising a brush head carrying bundles of bristles,
and a handle with an injection-molded basic body; the handle
comprising a fastening section extending up to the brush head,
through which the bundles of bristles are bonded to the basic body,
with a casting compound (8).
2. The brush according to claim 1, wherein the casting compound is
positioned at least at the height of the ends of the bundles of
bristles at the fastening side.
3. The brush according to claim 2, wherein the casting compound
seals the ends of the bundles of bristles at the fastening
side.
4. The brush according to claim 1, wherein the casting compound
forms a surface of the brush head which is penetrated by the
bundles of bristles.
5. The brush according to claim 1, wherein the casting compound
forms the bottom surface of the brush head which faces away from
the surface penetrated by the bundles of bristles.
6. The brush according to claim 1, wherein the casting compound is
provided between a bristle carrier carrying the bundles of bristles
and the basic body.
7. The brush according to claim 1, wherein the casting compound
forms the outer surface, preferably the rim area of the brush head,
at least in part.
8. The brush according to claim 1, wherein the fastening section is
formed in the manner of a brush head tray, and that the bundles of
bristles are bonded to the basic body by way of the casting
compound filled into the brush head tray.
9. The brush according to claim 8, wherein the casting compound is
filled substantially up to the rim of the brush head tray.
10. The brush according to claim 1, wherein the casting compound is
member selected from the group consisting of a hot melt adhesive,
an oligomer system, a PUR system.
11. The brush according to claim 8, wherein a plurality of bundles
of bristles are fastened to a bristle carrier having a surface
which is penetrated by the bundles of bristles and is arranged
substantially flush with the rim of the brush head tray.
12. The brush according to claim 11, wherein the bristle carrier is
configured as a plate-shaped component the contour of which is
matched to the contour of the rim of the brush head tray.
13. The brush according to claim 4, wherein the ends of the bundles
of bristles at the fastening side are held in the casting compound
and the casting compound forms the surface of the bristle head that
is penetrated by the bundles of bristles.
14. The brush according to claim 6, wherein the casting compound
has solidified flush with the surface of the bristle carrier
penetrated by the bundles of bristles.
15. The brush according to claim 8, wherein the brush head tray is
completely filled with the casting compound.
16. A method for manufacturing a brush having a brush head carrying
bundles of bristles, and a handle, in which the bundles of bristles
are bonded to a basic body manufactured by injection molding from a
thermoplastic after demolding of said basic body, which comprises
forming the bond between the bundles of bristles and the basic body
with a casting compound that is fastened to the basic body after
solidification of the casting compound.
17. The method according to claim 16, which comprises injection
molding the basic body with a brush head tray for accommodating the
bundles of bristles, introducing the bundles of bristles with their
ends at the fastening side into the brush head tray, filling the
brush head tray with the casting compound and sealing the ends of
the bundles of bristles at the fastening side.
18. The method according to claim 17, which comprises introducing
the casting compound into the brush head tray, and introducing the
bundles of bristles at the end side of the brush head tray with
displacement of the casting compound up to about the height of the
rim of the brush head tray.
19. The method according to claim 17, which comprises fastening the
bundles of bristles to a bristle carrier penetrated by the bundles
of bristles, and introducing the bristle carrier into the brush
head tray to such an extent that the casting compound is displaced
into a gap between the bristle carrier and the basic body
approximately up to the height of the rim of the brush head
tray.
20. The method according to claim 18, which comprises fastening the
bundles of bristles to a bristle carrier penetrated by the bundles
of bristles, and introducing the bristle carrier into the brush
head tray to such an extent that the casting compound is displaced
into a gap between the bristle carrier and the basic body up to
about the height of the rim of the brush head tray.
21. The method according to claim 17, which comprises arranging the
individual bundles of bristles in holes of a hole field plate
containing a hole field that predetermines the bristle attachment
to be formed, sealingly placing the hole field plate on the rim of
the brush head tray, and introducing the casting compound into the
cavity closed by the hole field plate such that the ends of the
bundles of bristles at the fastening side that project into the
brush head tray are sealed in the casting compound, and the casting
compound solidifies with molding of the surface of the hole field
plate.
22. The method according to claim 18, which comprises arranging
individual bundles of bristles in holes of a hole field plate
having a hole field which predetermines the bristle attachment to
be formed, sealingly placing the hole field plate on the rim of the
brush head tray, and introducing the casting compound into the
cavity closed by the hole field plate such that the ends of the
bundles of bristles at the fastening side that project into the
brush head tray are sealed in the casting compound, and the casting
compound solidifies with molding of the surface of the hole field
plate.
23. The method of claim 18 wherein the brush comprises a
toothbrush.
24. The brush of claim 1 comprising a toothbrush.
Description
[0001] The present invention relates to a brush, particularly a
toothbrush, comprising a bristle head carrying bundles of bristles,
and a handle with an injection-molded basic body which comprises a
fastening section extending up to the brush head, through which the
bundles of bristles are bonded to the basic body.
[0002] Such a toothbrush is known from EP 1 142 505. In this prior
art, a bristle carrier in the form of a brush head platelet is
first provided with bundles of bristles. The bundles of bristles
are first fastened to the platelet-like bristle carrier, and the
unit formed in this way is thereafter inserted into the brush head
tray and fastened. As disclosed in EP 1 142 505, the fastening
operation can be carried out by way of welding. The publication
also discloses the gluing of the platelet to the brush head tray.
To this end the contour of the platelet must exactly be matched to
the contour of the brush head tray according to EP 1 142 505.
Moreover, the inner circumference of the brush head tray and the
peripheral rim of the platelet are made conical to achieve a
contact that is as tight and secure as possible between the brush
head and the platelet. This procedure is relatively complicated and
cannot guarantee that dirt will not get caught between the platelet
and the rim of the brush head tray. In an alternative variant,
which is also known from EP 1 142 505, adhesive is applied to the
upper side of the brush head to cover the rim of the platelet. It
might be that this will lead to a complete sealing of the gap
between the platelet and the brush head. However, this will result
in an objectionable contouring on the surface of the brush, which
also promotes the collection of dirt and bacteria and is moreover
detrimental to the cleaning efficiency in specific brushes.
Particularly in the case of toothbrushes attention must be paid
that the surface penetrated by the bundles of bristles is made as
smooth as possible.
[0003] The teaching imparted in EP 1 142 505, however, adopts an
idea that should in principle be welcomed, i.e. first to
manufacture the basic body by way of injection molding, which
leaves the option to reproduce also complicated contours in an
accurate way and at low costs, possibly in a multi-component
injection-molding process to mount functional surfaces or
advertising prints or ornamental supplements on the basic body. The
manufacture of the basic body by applying relatively high internal
mold pressures will be completed before the bundles of bristles are
bonded to the basic body. It is only after the basic body has been
removed from the injection mold that the bundles of bristles will
be attached to the basic body. Nevertheless, it is not in the
conventional way that the bundle of bristles is introduced into a
recess provided on the brush head for this purpose and is equipped
with a metallic anchor (conventional anchoring technique), but a
relatively flat bristle carrier is first equipped with bundles of
bristles and is then attached to the basic body. The bristle
carrier can here be easily provided with bristle bundles of
different sizes, which is rendered difficult in the conventional
anchoring technique.
[0004] As has already been described above, the solution known from
EP 1 142 505 is however not optimal under hygienic and usability
aspects.
[0005] It is the object of the present invention to develop the
prior-art brush in this respect. Moreover, the present invention
wants to provide a method suited for manufacturing such a
brush.
[0006] In consideration of the product-based problem the present
invention provides a brush comprising a brush head carrying bundles
of bristles, and a handle with an injection molded basic body
having a fastening section extending up to the brush head through
which the bundles of bristles are bonded to the basic body through
a casting compound brush differs from the generic prior art in that
the bundles of bristles are bonded to the basic body through a
casting compound.
[0007] As compared with the prior-art adhesive, the casting
compound is advantageous in terms of low viscosity so that possible
free spaces between the basic body and the bundles of bristles or a
basic body carrying said bundles of bristles are filled with the
casting compound. This is true both for possible free spaces inside
the brush head and for the filling of voids and small free spaces
or slots on the phase boundaries of different elements of the brush
head by the casting compound. Furthermore, the casting compound is
preferably used with a volume that fills all free spaces inside the
brush head, whereby hygienic standards are complied with in an
improved way. The casting compound is here applied with a technique
differing from injection molding onto, on or around the fastening
section.
[0008] Owing to the low-viscosity characteristics of the casting
compound it is further possible to form the contour of the brush
head either completely or partly by way of the casting compound,
i.e. also in cases where the exact molding of complex surfaces
structures is required. Due to its low viscosity and its material
constitution the casting compound can be processed at atmospheric
pressure or at a relatively small overpressure, so that in contrast
to the bonding of the bundles of bristles by way of injection
molding less equipment is needed and there is also no danger that
the casting compound will travel along the filaments of bundles of
bristles beyond the outer surface of the brush head to be formed
and will glue the filaments of the bundles of bristles.
[0009] According to a preferred development of the present
invention it is suggested that the casting compound should be
positioned at least at the height or level of the ends of the
bundles of bristles at the fastening side. This development is
governed by the idea that the basic body forms channels for passing
the bundles of bristles therethrough that preferably project beyond
the basic body with their ends at the fastening side and form
thickened portions that are formed at the end of the channels
particularly preferably by fusion and rest on the channels and can
seal the same. The casting compound can be introduced for the
manufacture of this preferred embodiment into a mold having
surfaces that are copied by the casting compound, so that the
casting compound forms the bottom surface of the brush head, i.e.
the surface that in relation to the brush head surface penetrated
by the bundles of bristles is provided opposite thereto.
[0010] In an alternative design the casting compound may also be
bonded to the fastening section of the basic body and to a carrier
shaped e.g. with the contour thereof and/or the contour of the
brush head. This design yields a sandwich structure consisting of
fastening section, casting compound and bristle carrier, with the
ends of the bristle bundles at the fastening side being positioned
inside the casting compound and preferably sealed or encapsulated
by the same.
[0011] In a further alternative design, the casting compound forms
the surface of the brush head penetrated by the bundles of
bristles. In this design the casting compound is tightly placed
around the bundles of bristles and seals the ends at the fastening
side preferably on the phase boundary between the fastening section
and the layer formed by the casting compound. The low viscosity of
the casting compound yields a smooth surface penetrated by the
bundles of bristles. Said bundles of bristles are kept in the
manufacture of said development preferably in channels of a mold,
which at any rate in a direction parallel to the bundles of
bristles leaves some spacing between the fastening section and the
mold surface. When said free space is filled with the casting
compound, it need not be feared due to the processing of the
casting compound at atmospheric pressure or at a just slightly
raised internal pressure in the mold that the casting compound will
enter into the channels and glue the filaments of bundles of
bristles above the surface to one another.
[0012] In the above-mentioned development in which the layer formed
of the casting compound is arranged between the fastening section
and a bristle carrier, it is possible to provide just a relatively
thin layer of casting compound. The brush head can be produced with
a very small thickness. The casting compound is here provided
between the fastening section and the bristle carrier just as a
thin film. However, in this design the casting compound can also
flow around the rim area of the fastening section and/or the
bristle carrier. Said preferred design exploits the special
material constitution of the casting compound after solidification,
with the provision that said constitution differs from the material
constitution of the injection-molded basic body. Thus cases are
possible where the casting compound after solidification shows
rubber-like or elastomeric characteristics by virtue of which a
softer impact and/or cleaning surface can be created on the rim
area of the brush head. Likewise, it is feasible to incorporate
special ingredients into the casting compound before casting the
latter, said ingredients being discharged during use of the brush.
Cleaning additives are here above all envisaged that enhance the
cleaning efficiency. In the case of a toothbrush, additives may
also be added that exhibit a therapeutic effect in the oral
cavity.
[0013] In contrast to the adhesive according to EP 1 142 505, which
is just applied in the area of the contact surfaces between bristle
carrier and basic body, the brush head tray is filled with a
casting compound in the product according to the invention. Said
compound solidifies substantially up to the rim of the brush head
tray, preferably exactly at the same height with said rim. As for
the aim to fill the casting compound "substantially" up to the rim
of the brush head tray, this should be understood such that a small
trough or a minor elevation is possibly provided in the area of the
rim of the brush head tray. Said slight contour, however, is so
insignificant that there will be no noticeable difference with
respect to the cleaning properties and the hygienic demands as
compared with a brush having an entirely flat continuous, e.g.
materially identical, surface in the area of the brush head.
[0014] First of all, a volume of the casting compound may be
introduced into the brush head tray that is smaller than the volume
of the brush head tray. The casting compound may then be filled
substantially up to the level of the rim in that the bundles of
bristles are introduced with displacement of casting compound with
their end at the fastening side into the casting compound.
Optionally, said bundles of bristles may here also be fastened to a
bristle carrier the insertion of which into the bristle head tray
will displace casting compound, so that said compound solidifies
approximately at the height of the rim of the brush head tray.
[0015] The casting compound preferably fills the whole brush head
tray, whereby the hygienic properties are improved and also the
attachment of the bundles of bristles to the basic body.
[0016] A hot melt adhesive may be used as the casting compound.
Suitable hot melt adhesives show a very low viscosity at processing
temperature, i.e. at a temperature below the melting point of the
thermoplastic forming the basic body.
[0017] As an alternative, the casting compound may be formed by an
oligomer system. Envisaged is here for instance a cyclic butylene
terephthalate (CBT). Corresponding CBTs may be provided in
powder-like or granular form. When heated, they will polymerize
into thermoplastic PBT (polybutylene terephthalate). Likewise, the
viscosity of such oligomer systems is relatively low. At the
processing temperatures to be employed in this instance it is about
at least ten times the viscosity of the thermoplastic forming the
basic body.
[0018] Similar advantages are offered by casting compounds of the
PUR system. Here, one-component or two-component systems may be
used as casting compound. A casting compound of polyurethane can be
adjusted in terms of processing time, color and hardness within
wide limits and almost in any desired way. The viscosity during
processing is about 10 to 100 times lower than that of the
thermoplastic forming the basic body, which may e.g. be
polypropylene.
[0019] The alternatives presented above with respect to the
material constitution of the casting compound show the common
feature of a considerably reduced viscosity under processing
conditions. Thus, while being filled into a mold for bonding the
bristle bundle to the basic body, the casting compounds can fill
all of the free spaces and can also seal minor gaps to the outside
that are e.g. exposed between the outer circumference of the
bristle carrier and the inner circumference of the brush head tray
and/or within a grid-like bristle carrier and, without the
penetration of the casting compound, would provide cavities in
which dirt or germs might accumulate. Low viscosities within the
meaning of the present invention are particularly viscosities of
between 0.5 mPas and 10.sup.6 mPas, preferably between 10.sup.2
mPas and 10.sup.4 mPas at processing temperature. The processing
temperature may be room temperature. At elevated temperatures the
processing temperature is below the melting point of the
thermoplastic forming the basic body. The thermoplastic forming the
wall of the brush head tray is of relevance in the case of basic
bodies which are injection-molded from several components.
[0020] For the solution of the method aspect according to the
present invention, the present invention provides a method for
manufacturing a brush, particularly a toothbrush, comprising a
brush head carrying bundles of bristles, and a handle, wherein the
bundles of bristles are bonded to a basic body manufactured by
injection molding from a thermoplastic after demolding of the basic
body, which method differs from the previously indicated generic
prior art in that the bond between the bundles of bristles and the
basic body is established through a casting compound that after its
solidification is fastened to the basic body.
[0021] In this procedure the casting compound after solidification
will preferably fill all cavities in the area of the brush head.
The casting compound can shape the brush head partly or however
also predominantly. In the method according to the invention the
casting compound is possibly cast into an upwardly open mold
accommodating the fastening section, in which it solidifies. As an
alternative, the mold for forming the brush head may also be
substantially closed with inclusion of the fastening section. Such
a closed mold will particularly be used whenever the casting
compound is to form a substantial portion of the surface of the
brush head, or even the whole surface of the brush head. While
being processed the casting compound shows a relatively low
viscosity, particularly within the above-mentioned parameter
limits. At atmospheric pressure or at a low internal pressure at
the most, the casting compound is introduced into the mold and is
solidified therein. Thus the casting compound can first be
introduced into the mold under atmospheric conditions.
[0022] A mold within the above meaning may also be one formed by
the fastening section itself. Said section may e.g. be shaped in
the form of a brush head tray which is introduced into the casting
compound. When the ends of the bristle bundles at the fastening
side are introduced into such a brush head tray, the casting
compound will rise, namely preferably up to the rim of the brush
head tray. This creates a brush in which the surface penetrated by
the bristle bundles is entirely even and smooth. In matching the
volume of the brush head tray with the displacement volume of the
introduced bundles of bristles optionally of the bristle carrier
carrying the bundles of bristles, the volume of the casting
compound to be filled in can here be determined such that it
solidifies at the same level with the rim of the brush head tray
also in the areas between the bundles of bristles. Such
solidification also between the bundles of bristles will also occur
in the case of a bristle carrier on condition that said carrier has
an individual grid structure connecting the bristle bundles to one
another. The casting compound will flow through this open grid,
which is sealed in the casting compound for the attachment of the
bundles of bristles.
[0023] If the bristle carrier is shaped as a platelet with a closed
surface penetrated by the bristle bundles, the casting compound
will exclusively pass into a gap between the bristle carrier and
the basic body and will be moved by displacement approximately up
to the height of the rim of the brush head tray, with the casting
compound preferably solidifying after a short period of time.
[0024] While in the above-described procedure the brush head tray
is not completely closed in the manufacturing process, an
alternative configuration yields a cavity that is first closed and
into which the casting compound is introduced. To this end the
bundles of bristles are first arranged in holes of a hole field
plate, the hole field of which is predetermined by the bristle
attachment of the brush to be formed. This hole field plate is
sealingly applied to the rim of the brush head tray. The cavity
created thereby is filled with the casting compound. At the back
side of the brush head tray oriented away from the bundles of
bristles, a filling hole may be formed for the casting compound. A
venting hole may possibly be provided at said place as well,
through which venting hole the air displaced out of the cavity can
escape. However, the air can just as well exit through the holes of
the hole field plate. The internal pressure inside the cavity is
thereby controlled such that the casting compound during
solidification inside the cavity molds the surface of the hole
field plate without, however, penetrating into the holes to a
considerable extent. Such a procedure is possible owing to the
relatively low viscosity and due to the application of only
relatively low internal pressures in the cavity. As a result of
such a procedure, a smooth surface penetrated by the bundles of
bristles is obtained on the finished brush. After solidification
the casting compound may show a certain residual elasticity, so
that the ends of the bristle bundles at the fastening side are
elastically supported within limits. Filling and sealing of the
brush head tray does not require any complicated injection mold, as
is needed in the procedure according to U.S. Pat. No.
5,350,219.
[0025] The brush produced according to the method can thus be
manufactured in an economic way, it meets the hygienic demands to
be e.g. made in the case of toothbrushes and has a brush head
surface which could be called even and defect-free and which is
penetrated by the bundles of bristles.
[0026] Advantages and details of the invention become apparent from
the following description of embodiments in combination with the
drawing, in which drawing:
[0027] FIG. 1 is a longitudinal sectional view of a first
embodiment of the present invention in the form of a
toothbrush;
[0028] FIG. 2 is a longitudinal sectional view of a second
embodiment of the present invention in the form of a toothbrush;
and
[0029] FIG. 3 is a longitudinal sectional view of a third
embodiment of the present invention in the form of a
toothbrush.
[0030] FIG. 1 shows a basic body 1 which in the area of the brush
head 2 forms a brush head tray 3 that is open towards the upper
side of the brush and is defined by a surrounding rim 4.
[0031] FIG. 1 shows the basic body schematically at a time when a
brush head platelet 6 carrying a bundle of bristles 5 and forming a
bristle carrier is not yet bonded to the basic body 1. The brush
head platelet 6 comprises channels through which the individual
bundles of bristles 5 are inserted. At the ends at the fastening
side the bundles of bristles 5 are provided with a thickening 7
that is produced by fusion of the bundles of bristles 5. The
thickening 7 rests on the bottom side of the brush head platelet 6,
thereby closing the channels. A casting compound 8 is applied to
the surface formed in part by the thickening 7 and in part by the
bottom side of the brush head platelet. The brush head platelet 6
prepared in this way is inserted together with the bundles of
bristles 5 into the brush head tray 3. The casting compound 8 is
here flowing inside the brush head tray 3, filling all cavities,
and finally penetrates into a gap between the circumferential
surface of the brush head platelet 6 and the basic body 1, until
the casting compound 8 is approximately at the same height as the
rim 4 and the surface of the brush head platelet 6. The casting
compound 8 is solidifying at said place.
[0032] FIG. 2 shows an alternative embodiment in which the basic
body forms a substantially flat fastening section 9 which forms
channels for holding bundles of bristles 5. These bundles of
bristles 5 are also fused at their ends at the fastening side for
forming thickenings 7. The basic body 1 prepared in this way is
subjected, projecting with the bundles of bristles 5 downwards from
the basic body 1, to a further treatment step in which the casting
compound 8 is applied to the bottom side of the basic body and
partly to the thickenings 7. After the casting compound 8 has
solidified, a shoulder-free surface is obtained on the bottom side
of the brush. The bottom side formed by the basic body 1 passes
without any shoulders into the bottom side formed by the casting
compound 8. A corresponding structure is obtained at the face end
of the brush.
[0033] In the alternative embodiment shown in FIG. 3, a hole field
plate 10 is first equipped with bundles of bristles 5 that at their
ends at the fastening side are provided with a thickening 7 by way
of fusion. The hole field plate 10 prepared in this way is mounted
on the brush head tray 3 so that the hole field plate 10 rests on
the rim 4 and seals a cavity 11 predetermined by the brush head
tray 3. The hole field plate 10 is here sealing the brush head tray
3 on its rim. The casting compound 8 is introduced into the cavity
11 through an introduction opening 12 recessed on the bottom side
of the basic body 1. The casting compound 8 solidifies inside the
cavity 11 with inclusion of the ends of the bundles of bristles 5
at the fastening side and particularly of the thickenings 7. The
casting compound thereby seals the ends of the bundles of bristles
5 at the fastening side, with the ends projecting into the brush
head tray 3. After solidification a shoulder-free even surface that
is penetrated by the bundles of bristles 5 is obtained on the brush
head 2, the surface being partly formed by the material of the
casting compound 8 and partly by the plastic component of the basic
body 1. The solidified casting compound 8 solidifies while molding
the surface of the hole field plate 10.
LIST OF REFERENCE NUMERALS
[0034] 1 Basic body
[0035] 2 Brush head
[0036] 3 Brush head tray
[0037] 4 Rim
[0038] 5 Bundles of bristles
[0039] 6 Brush head platelet
[0040] 7 Thickening
[0041] 8 Casting compound
[0042] 9 Fastening section
[0043] 10 Hole field plate
[0044] 11 Cavity
[0045] 12 Introduction opening
* * * * *