U.S. patent application number 12/446418 was filed with the patent office on 2011-07-07 for cleaning system.
This patent application is currently assigned to CARL FREUDENBERG KG. Invention is credited to Ralf Jurgens, David McKnight, Norbert Weis.
Application Number | 20110162983 12/446418 |
Document ID | / |
Family ID | 38578642 |
Filed Date | 2011-07-07 |
United States Patent
Application |
20110162983 |
Kind Code |
A1 |
Weis; Norbert ; et
al. |
July 7, 2011 |
CLEANING SYSTEM
Abstract
A cleaning system is described that comprises a cleaning utensil
(4) featuring a handle (6) and a cleaning head (5) as well as at
least one device for cleaning the cleaning utensil with a cleansing
fluid, especially after use. According to the invention, the
facility for cleaning the cleaning utensil with a cleansing fluid
comprises an aerosol spray container (15) with an aerosol
spray.
Inventors: |
Weis; Norbert; (Heddesheim,
DE) ; Jurgens; Ralf; (Glen Ellyn, IL) ;
McKnight; David; (Hinsdale, IL) |
Assignee: |
CARL FREUDENBERG KG
Weinheim
DE
|
Family ID: |
38578642 |
Appl. No.: |
12/446418 |
Filed: |
May 8, 2007 |
PCT Filed: |
May 8, 2007 |
PCT NO: |
PCT/EP2007/004068 |
371 Date: |
March 23, 2011 |
Current U.S.
Class: |
206/229 |
Current CPC
Class: |
A47K 11/10 20130101 |
Class at
Publication: |
206/229 |
International
Class: |
B65D 71/00 20060101
B65D071/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 20, 2006 |
DE |
10 2006 050 467.4 |
Oct 20, 2006 |
DE |
10 2006 050 475.5 |
Claims
1-20. (canceled)
21. A cleaning system comprising a cleaning utensil including a
handle and a cleaning head and at least one device for cleaning the
cleaning utensil with a cleansing fluid comprising an aerosol spray
container with an aerosol spray.
22. The cleaning system according to claim 21, wherein the aerosol
spray contains antibacterial or anti-microbial substances.
23. The cleaning system according to claim 21, wherein the aerosol
spray contains a drying accelerator.
24. The cleaning system according to claim 21, wherein the cleaning
system includes a storage container for the cleaning utensil.
25. The cleaning system according to claim 24, wherein the cleaning
system includes a device for closing the storage container.
26. The cleaning system according to claim 25, wherein the device
for closing the storage container is hinged to an outer wall of the
storage container in such that the device is pivotable between open
and closed positions.
27. The cleaning system according to claim 26, wherein the device
for closing the storage container comprises two half-shell elements
that are pivotable in opposition to another.
28. The cleaning system according to claim 26, further comprising a
closing mechanism for automatically swinging the two half-shell
elements into a closed position when the cleaning utensil is
inserted in the storage container.
29. The cleaning system according to claim 28, wherein the closing
mechanism comprises lever elements.
30. The cleaning system according to claim 25, wherein device for
closing the storage container comprises a lid fitted on the handle
of the cleaning utensil, the lid being placed on the rim of the
storage container when the cleaning utensil is inserted in the
storage container.
31. The cleaning system according to claim 24, wherein the storage
container comprises at least one principal chamber for inserting
and storing the cleaning utensil and a secondary chamber that is
linked to the principal chamber by an open passage.
32. The cleaning system according to claim 31, wherein the
principal chamber and the secondary chamber are separate container
sections.
33. The cleaning system according to claim 32, wherein the
container sections housing the principal and the secondary chambers
are interconnected in a detachable manner.
34. The cleaning system according to claim 33, wherein the
container section housing the secondary chamber has a pedestal
configuration to which the container section housing the principal
chamber can be attached.
35. The cleaning system according to claim 33, wherein the
container sections housing the principal and the secondary chambers
are interconnected by a plug-in connection.
36. The cleaning system according to claim 21, wherein the aerosol
spray container discharges into the principal chamber.
37. The cleaning system according to claim 21, further including an
operating mechanism for operating the aerosol spray container, the
operating mechanism being configured such that it will be actuated
by the insertion of the cleaning utensil in the storage
container.
38. The cleaning system according to claim 37, further including a
return mechanism for closing the aerosol spray container after a
brief discharge of aerosol spray.
39. The cleaning system according to claim 38, wherein the return
mechanism operates via spring tension.
40. The cleaning system according to claim 21, wherein the ratio of
percent space filling in to percent driving agent concentration
smaller less than or equal to 5.
Description
TECHNICAL FIELD
[0001] The invention concerns a cleaning system that comprises a
cleaning utensil featuring a handle and a cleaning head as well as
at least one device for cleaning the utensil with a cleansing
fluid, especially after use.
BACKGROUND OF THE INVENTION
[0002] A variety of cleaning systems that have cleaning utensils
and a device for cleaning the utensil are known, such as e.g. from
DE 299 21 374 U1. The cleaning system disclosed in the indentified
reference consists of a storage container for storing and cleaning
a toilet brush. For the purpose of cleaning the toilet brush after
use, the storage container comprises a disinfecting unit featuring
a tank with a disinfecting fluid, a spray device, a supply line
from the tank to the spray device and a pump.
[0003] By operating the pump, a preset quantity of disinfectant is
pumped from the tank and conducted via the supply line to the spray
device from where it is sprayed onto the brush head.
[0004] The disadvantage of this cleaning system is that it requires
cumbersome equipment.
BRIEF SUMMARY OF THE INVENTION
[0005] A general object of the invention is to provide a cleaning
system of the above described type that has a fairly simple and
cost-effective structure.
[0006] This objective is achieved by a cleaning system with all the
features of patent claim 1. Advantageous embodiments of the
invention are described in the sub-claims.
[0007] A cleaning system according to the invention, which
comprises a cleaning utensil with a handle and a cleaning head as
well as at least one device for cleaning the utensil with a
cleansing fluid, is so designed that the facility for cleaning the
utensil with a cleansing fluid comprises an aerosol spray container
with an aerosol spray.
[0008] Aerosol sprays are well known. Aerosols are understood to
mean minute solid or liquid particles suspended in a gas, such as
air. This principle is used in the aerosol spray container. It
consists essentially of a container, e.g. a box, with a spray head
fitted with a valve. Inside the container there is both a driving
agent, usually liquefied or compressed gas, for providing pressure
in the container, and an active agent, e.g. a cleansing agent. To
open the valve, the spray head is usually depressed against the
internal pressure in the box. There may be an additional spring to
ensure, on the one hand, the return of the spray head to its
original position and, on the other, the closing of the valve, such
spring counteracting the depression of the spray head. When the
valve is opened, the pressure in the vessel drives out the active
agent, which, due to the explosion-like expansion of the driving
agent, is dissipated into minute particles.
[0009] The cleaning system of the invention distinguishes itself by
a simple and cost effective construction. Cumbersome equipment
known from prior art as described above, comprising a pump and
spray device plus a separate container with supply lines for the
active agent can be dispensed with. Such functions are assumed in a
simple manner by the aerosol spray container.
[0010] The known cleaning system, being independent of any power or
other supplies, can be placed anywhere in a sanitary room, wherever
it is most easily accessible for use. The pressure of the driving
agent in the aerosol spray container also ensures a very fine
distribution of the aerosol during spraying. And it prevents the
valves from becoming blocked.
[0011] The aerosol spray container can easily be bought as an
accessory and, when empty, be exchanged for a new full container.
This also allows the use of different cleansing agents. Another
advantage is an acoustic control through the spraying sound when
the aerosol is dispersed.
[0012] When the container is empty, there will be no spraying
sound. The spring action also disappears, i.e. the spring effect on
the return spring tension is reduced. This is an automatic
indication of the end of life of such an aerosol container.
[0013] Suitable cleansing fluids are any cleansing agents available
for sanitary purposes.
[0014] Preferred cleansing agents are those that contain so-called
"drying accelerators", e.g. liquids that mix with water while
forming azeotropes. Such drying accelerators can be e.g. alcohol,
especially ethanol or isopropyl alcohol.
[0015] The cleansing fluids used in connection with the invention
may also contain basically known anti-bacterial/anti-microbial
substances, especially quaternary ammonium salts, such as octyl
decyl dimethyl ammonium chloride, dioctyl dimethyl ammonium
chloride, didecyl dimethyl ammonium chloride, alkyl dimethyl benzyl
ammonium saccharinate, as well as phenols, such as o-phenylphenol,
o-benzyl-p-chlorophenol, triclosan, silver and silver salt,
hydrogen peroxide, either free or in a combined form, hypochlorite,
chloride, either free or in a combined form.
[0016] As mentioned above, the cleansing fluid may also contain
fragrant additives.
[0017] A particularly favourable cleansing fluid contains the
following: [0018] 0.1% alkyl [50%C(14), 40%C(12), 10%C(16)]
dimethyl benzyl ammonium saccharinate], [0019] 79% ethanol, [0020]
20.9% other inert additives.
[0021] It is customary, without restricting the generalility of the
system, to use hydrocarbons, hydrofluorocarbons, propane or
butane.
[0022] A preferred configuration of the invention features a device
for closing and sealing the storage container. This is preferably
hinged to the outer wall of the storage container in such a manner
that it can swing from open to closed position. A particularly
advantageous design of the closing and sealing device is formed by
two half-shell elements that can be swivelled in opposition to one
another.
[0023] The advantage of such a comparatively simple constructive
measure is that, with open half-shell elements, the intake port is
large enough for a problem-free insertion from above of the
cleaning utensil held in upright position. Since the half shells in
open position form a sort of funnel with upwardly widening walls in
essentially conical fashion, any developing droplets can be caught
and conducted into the container interior. There will never be any
undesired, unaesthetical contamination of the outer walls of the
storage container.
[0024] The symmetrical arrangement of the half-shell elements
permits an easy installation of an automatic closing mechanism,
e.g. via a lever arrangement with lever elements, such mechanism
leading to the half shells automatically swinging into closed
position when the cleaning utensil is inserted in the storage
container. The two half shells are preferably designed in such a
way that, due to the effect of gravity, they automatically return
to the open position when the cleaning utensil is lifted out.
[0025] In a further preferred embodiment of the invention the
storage container can be closed and sealed by means of a lid fitted
to the handle of the cleaning utensil, such a lid being fitted on
the rim of the storage container from above when the cleaning
utensil is inserted in it.
[0026] In yet another preferred embodiment of the invention the
storage container of the cleaning system comprises at least one
principal chamber for inserting and storing the cleaning utensil as
well as a secondary chamber that is linked to the main chamber by
an open passage.
[0027] The principal and secondary chambers are advantageously
designed as separate container sections that can be interconnected
in a detachable manner. The advantage of such a design is that the
two container sections can be easily separated and cleaned
independently. Emptying and cleaning the storage container thus
becomes a simple and hygienic process.
[0028] A particularly preferred embodiment of the invention is a
design where the container section with the secondary chamber forms
a pedestal on which the container section with the principal
chamber can be fitted from above. The advantage of this design is
that, for emptying and cleaning, the container section with the
principal chamber can easily be lifted off the container section
with the secondary chamber forming a pedestal. There is no need for
any other parts to be dismantled or extracted. Following the
cleaning process, the two container sections can be easily
reconnected. Another advantage of the embodiment just described is
that the container section with the principal chamber can have a
geometrically simple design, e.g. as a bowl, which is easy to
clean. Since, for achieving a fairly high concentration of
cleansing fluid in the principal chamber combined with sparse
application doses, the size of the container section will not
significantly exceed the dimensions of a brush head, it can easily
be swivelled around in a bath containing cleaning liquid.
[0029] The two container sections are advantageously linked with
one another via a plug-in connection. This facilitates an easy
separation and reconnection of the two sections with a minimum
amount of force.
[0030] Furthermore, the container section designed as a pedestal
may be wider than the container section with the principal chamber
in order to ensure that the whole storage container has a firm and
secure footing, without the optical appearance suffering or the
whole storage container being too bulky.
[0031] The aerosol spray container with the aerosol spray can be
fitted in the principal chamber of the storage container that also
houses the cleaning utensil, or in the secondary chamber, which, as
described above, is linked with the principal chamber by an open
passage. The spray head of the aerosol spray container can be
fitted on the side of or underneath the cleaning head of the
cleaning utensil.
[0032] Also possible is a design where the aerosol spray container
is fitted in the handle of the cleaning utensil, from where the
aerosol is sprayed onto the brush head through appropriate openings
from above; or the spray is placed in the brush head itself, which,
for this purpose, must feature suitable outlet points.
[0033] Cleansing fluid can be applied quite simply by depressing
the spray head of the aerosol spray container. This may be done
manually.
[0034] With the cleaning system of the invention it would be of
advantage however if a mechanism were to be provided for an
automatic depression of the spray head, such mechanism being
activated, for example, by inserting the cleaning utensil in the
storage container. Such automatic operating mechanisms are known in
principle. Their functioning is usually based on the existence of
protrusions, levers etc. fitted on the storage container in such a
way that they automatically depress the spray head whenever the
cleaning utensil is inserted in the container.
[0035] The spray head is automatically reset to the closed position
of the valve, due, as mentioned in the beginning, to the high
pressure inside the container, and through the effects of a return
spring.
[0036] Another preferred embodiment of the invention features a
time clock for operating the opening mechanism. In this way
cleaning can take place at regular, freely adjustable intervals,
especially during prolonged storage periods without the cleaning
utensil being in use. If the aerosol also contains fragrances and
since the cleaning container is not hermitically sealed, there is
the added advantage of pleasant smells getting into the room at
regular intervals.
[0037] In addition to the cleaning utensil being provided with a
cleansing fluid, as described above, other cleaning agents may be
added, e.g. lamps for a fluorescent light to kill off bacteria and
similar.
[0038] The cleaning system described is intended especially for use
in sanitary equipment, in particular and preferably for the storage
and, if necessary, cleaning of toilet brushes.
[0039] Brushes, especially toilet brushes, usually feature bunches
of bristles. Instead of such bristles it is possible to use
cleaning elements of flexible material produced by injection
moulding. These can vary considerably with regard to diameter,
length and number of elements. For the purpose of an optimum
distribution of the cleansing agent across the whole surface of
different types of brush heads in the container, both the amount of
driving agent in the aerosol as well as the "space filling" by the
brush head have been shown to be of importance. In the context of
the invention "space filling" is understood to be a good
approximation of the ratio of the volume taken up by the bristle
carrier and bristle bunches, or the cleaning element carrier and
the cleansing elements, on the one hand, to the volume enclosed by
the surface of the housing around the bristle bunches or cleaning
elements, on the other. The specific form of the cleaning elements,
or the specific bristles and number of bristles in a bunch, are of
lesser importance.
[0040] An acceptable covering of the brush head surface with
cleansing fluid has been shown to be achieved with a concentration
of driving agent in the aerosol of greater than/equal to 10% and a
space filling by the brush head of less than or equal to 25%.
[0041] Up to a space filling level of 50% it is possible to achieve
an acceptable covering of the brush head surface with cleansing
fluid, with the driving agent concentration being larger than/equal
to 15% in the aerosol.
[0042] With a space filling level of between 50-80% an acceptable
covering can usually be achieved with a driving agent concentration
of larger than/equal to 20% in the aerosol.
[0043] Overall, it has been shown that the quotient of space
filling in % and driving agent concentration in % should be smaller
than/equal to 5. The preferred quotient is smaller than/equal to 3
and, even better, smaller than/equal to 2.
[0044] An even distribution of the cleansing fluid during and
immediately following the spraying process can be further assisted
by the pattern of bristles on the brush head featuring preferred
flow channels for the cleansing fluid. A design where the bristle
bunches near the exit jets of the cleansing fluid are spaced
further apart proved to be of advantage. This makes it easier for
the opposite side of the brush head to be reached and facilitates
pronounced turbulence dynamics in the whole area of the brush
container.
[0045] In general, the cleaning system of the invention is suitable
for the storage and, if necessary, cleaning of all kinds of
cleaning utensils that feature a handle and a brush head, for
example also for storing and cleaning toothbrushes. The ratio
between space filling and driving agent concentration in the
aerosol is equally applicable to such cases.
[0046] The cleaning system of the invention is suitable for storing
and, if necessary, cleaning not only brushes but also any cleaning
utensils where the cleaning head is designed not as a brush but as
a formed shape of foam or fleece and similar.
[0047] The invention will be now be explained in detail with
reference to the embodiments shown in the drawings.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)
[0048] FIG. 1 is a schematic longitudinal cross-sectional view an
exemplary cleaning system according to the invention with the
aerosol spray container being arranged at the side of the cleaning
head of the cleaning utensil.
[0049] FIG. 2 is a schematic longitudinal cross-sectional view of
an exemplary alternative embodiment of a cleaning system according
to the invention with the aerosol spray container being arranged
centrally below the cleaning utensil.
[0050] FIGS. 3a to 3b are perspective views of exemplary cleaning
heads for toilet brushes such as may be used in a cleaning system
according to the invention.
DETAILED DESCRIPTION OF THE INVENTION
[0051] FIG. 1 shows a cleaning container 1 with a first container
section 2 comprising a principal chamber 3 which houses a cleaning
utensil 4 featuring a cleaning head 5 and a handle 6. The
illustrated cleaning utensil 4 is a toilet brush, shown as one
embodiment of the invention, without restricting the generality of
the principle. Reference number 7 refers to the bristles of the
cleaning head 5. The principal chamber 3 can be closed and sealed
to the outside by means of a lid 8 arranged on the handle 6 of the
cleaning utensil. Additional sealing is provided by a sealing ring
9 resting on a stepped ridge 10 along the inner wall 11 of
container section 2.
[0052] Reference number 12 in the illustration refers to a second
container section. This features a secondary chamber 13. Inside the
secondary chamber 13, held by a hollow, cylinder-shaped bracket 14,
there is an aerosol spray container 15 containing an aerosol with a
cleansing agent. The principal chamber 3 and the secondary chamber
13 are interconnected via an open passage 16 arranged at the level
of the head 17 of the aerosol spray container 15. Inside the
secondary chamber 13 there is also a support element 18 with a
spring element 19, the function of which shall be described in
detail below.
[0053] As can be seen from the illustration, the principal chamber
3 and the secondary chamber 13 are, according to the invention,
designed as separate container sections 2, 12. Special to the
design shown is that container section 2 is inserted in container
section 12. In this case, container section 2 rests on the head 17
of the aerosol spray 15 as well as on the support element 18 with
the spring element 19. It may be useful to arrange several support
elements 18 with spring elements 19 around the circumference of
container section 12. For emptying or cleaning or for changing the
aerosol spray container 15, container section 2 can simply be
lifted up out of container section 12. Following the cleaning
process, or after changing the aerosol spray container 15,
container section 2 can simply be reinserted from above into
container section 12.
[0054] Having a slightly larger cross-section area than container
section 2, which encloses the principal chamber 3, container
section 12 forms a kind of pedestal for container section 2 and
thus ensures greater stability.
[0055] Container section 2 features, along the outer circumference
of its lower part, a screen 20 that stretches horizontally outward
and forms the part that rests on the support elements 18 with the
spring elements 19 and on the head 17 of the aerosol spray
container 15. In the region of the head 17 of the aerosol spray
container 15, the screen 20 features an axial extension that serves
as an operating element 21 for the aerosol spray container 15. A
quick exertion of pressure on the handle 6 of the cleaning utensil
4 briefly depresses container section 2 against the tension of the
spring element 19. The spray head 17 of the aerosol spray container
15 is compressed simultaneously via the operating element 21 with
the result that a small amount of aerosol is dispersed and, through
the passage 16, reaches the principal chamber 3 with the cleaning
head 5. Due to the fact that, as described, the principal chamber 3
is sealed to the outside, the aerosol reaching the cleaning head 5
of the cleaning utensil 4 is of such high concentration that an
excellent degree of disinfection is achieved within a short
time.
[0056] FIG. 2 shows a further preferred embodiment of the
invention. Corresponding parts have the same reference numbers. In
the embodiment shown in FIG. 2, a centrally arranged hollow
cylinder-shaped receptacle 22 in the container section 12 forms the
secondary chamber for the aerosol spray container 15. Above the
hollow, cylinder-shaped receptacle 22, there is a radial extension
23 for accepting container section 2. The open passage 16 to the
principal chamber 3 of container section 2 is located in the floor
of the latter, directly above the spray head 17 of the aerosol
spray container 15, so that, by depressing the spray head 17 of the
aerosol spray container 15, aerosol is sprayed from below into the
principal chamber 3 housing the cleaning head 5.
[0057] The hollow, cylinder-shaped receptacle 22 for the aerosol
spray container 15 and the radial extension 23 for accepting
container section 2 are bordered by an operating element 24 that
fits in a corresponding receptacle 26 in container section 12 and
slides down along it in vertical direction against the tension of a
spring element 27 fitted on the floor of container section 12. As
will be described, such an arrangement facilitates an automatic
closing of container section 2 when the cleaning utensil 4 is
inserted.
[0058] For closing and sealing purposes in the embodiment shown,
two half-shell elements 28a, 28b, moveable in opposition to one
another, are hinged to container section 12 along its upper
circumference. Both are shown in open position in the drawing. Two
lever elements 29a, 29b are firmly fixed to the half-shell elements
28a, 28b, to ensure an automatic movement to the closed position
when the cleaning utensil 4 is inserted into the principal chamber
3, such lever elements 29a, 29b being hinged both to container
section 12, in the region of the radial extension on the inner wall
30, and to the operating element 24.
[0059] When pressure is exerted on container section 2 from above,
e.g. when the cleaning utensil 4 is inserted in the principal
chamber 3, container section 2 is pressed downward and exerts
corresponding pressure on the operating element 24 which, in turn,
is moved downward against the tension of the spring element 27.
This movement of the operating elements 24 causes the lever
elements 29a, 29b, hinged to the operating element 24, to be tilted
downward, thus causing the half-shell elements 28a, 28b to swing
towards their closed position. In an ideal case, the tension of the
spring element 27 and the weight of the cleaning utensil 4 are so
well tuned that the insertion of the cleaning utensil 4 only leads
to a closure of container section 2, whilst an additional exertion
of pressure on the handle 6 of the cleaning utensil 4 would be
required to activate the opening mechanism of the spray bottle 15.
This has the advantage that the cleaning utensil 4 can be stored in
the closed container section 2, without the opening mechanism of
the aerosol spray container 15 being automatically activated.
[0060] In the embodiment shown, the aerosol spray container 15
penetrates so deeply into the receptacle of container section 2 in
the area of the radial extension 23, that, following the insertion
of the cleaning utensil 4 into the principal chamber 3 and
following the movement of the half-shell elements 28a, 28b into
their closed position, another short tap would also briefly depress
the spray head 17, with the result that aerosol is sprayed upward
into the principal chamber 3 for a short time.
[0061] The illustration also shows that the floor 31 of the
container section 12 is raised in the area of the open passage 16,
so as to prevent any liquid from escaping through the passage
16.
[0062] FIGS. 3a and 3b show typical toilet cleaning heads such as
can be used in a cleaning system according to the invention.
[0063] The cleaning head 5 shown in FIG. 3a is configured as a
brush head. It consists of a brush carrier 5a having a diameter of
25 mm and a length of 60 mm. 64 bunches of bristles 7a featuring
straight bristles 7, an average bunch diameter of 6 mm and a free
length of 27.5 mm are evenly distributed over the carrier. The
cleaning/brush head 5 with its covering occupies a space volume of
about 400 ccm. Of this, the volume of the bristle carrier 5a
amounts to about 30 ccm. The bristle bunches 7a occupy a space of
approx. 50 ccm.
[0064] This results in a total space-filling rate of about 20% by
the bristle carrier 5a and the bristle bunches 7a. The cleansing
fluid can spread without restriction in the remaining approximately
80% of the space. An acceptable covering of the cleaning/brush head
surface with cleansing fluid is achieved with a driving agent
concentration of larger than/equal to 10% in the aerosol.
[0065] In the cleaning head 5 shown in FIG. 3b, configured as a
brush head, the bristles 7 are made of a TPE material. The bristles
7 are truncated cones tapering outwardly. The bristle carrier 5a
has a diameter of 30 mm and a length of 60 mm. 231 conical bristles
7, tapering outward from a 5 mm to a 3 mm diameter and having a
length of 20 mm, are distributed evenly across the bristle carrier
5a. The space-filling rate in this case is 35%. An acceptable
covering of the brush head surface with cleansing fluid is here
achieved with a driving agent concentration of larger than/equal to
15% in the aerosol.
[0066] Another typical cleaning head 5 for toilet brushes, designed
as a brush head, possesses comparable dimensions. However, in
contrast to the cleaning/brush head 5 shown in FIG. 3a, this
cleaning head contains 112 bristle bunches 7a with undulating
bristles 7. The bunches 7a are thicker and more fanned out than in
the cleaning/brush head shown in FIG. 3a. With an average bunch
diameter of 1 mm, there is a space-filling rate of 70%. An
acceptable covering of the brush head surface with cleansing fluid
is here achieved with a driving agent concentration of larger
than/equal to 20% in the aerosol.
* * * * *