U.S. patent application number 15/179021 was filed with the patent office on 2016-12-22 for oral hygiene implement and method of assembling an oral hygiene implement.
The applicant listed for this patent is Braun GmbH. Invention is credited to Thomas FRITSCH, Ulrich STORKEL.
Application Number | 20160367022 15/179021 |
Document ID | / |
Family ID | 53404450 |
Filed Date | 2016-12-22 |
United States Patent
Application |
20160367022 |
Kind Code |
A1 |
FRITSCH; Thomas ; et
al. |
December 22, 2016 |
ORAL HYGIENE IMPLEMENT AND METHOD OF ASSEMBLING AN ORAL HYGIENE
IMPLEMENT
Abstract
An oral hygiene implement, in particular a replacement brush
head, that has a carrier assembly mounted at a housing part for
movement relative to the housing part. The carrier assembly has at
least two carriers arranged at a distance therebetween and an
elongated, shaft-like connector element connected to the at least
two carriers. The connector element has undercut sections at the
locations where the carriers are connected to the connector
element. The carriers are plastic-injection molded parts extending
around the connector element so that the carriers are
non-detachably connected to the connector element by a positive-fit
connection. A method of assembling an oral hygiene implement is
also provided.
Inventors: |
FRITSCH; Thomas; (Eppstein,
DE) ; STORKEL; Ulrich; (Bad Nauheim, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Braun GmbH |
Kronberg |
|
DE |
|
|
Family ID: |
53404450 |
Appl. No.: |
15/179021 |
Filed: |
June 10, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A46B 5/0095 20130101;
A46B 9/04 20130101; A61C 17/3418 20130101; A61C 17/349 20130101;
A46B 13/02 20130101; A61C 17/16 20130101 |
International
Class: |
A46B 5/00 20060101
A46B005/00; A46B 13/02 20060101 A46B013/02; A46B 9/04 20060101
A46B009/04 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 17, 2015 |
EP |
15172529.8 |
Claims
1. An oral hygiene implement comprising a replacement brush head
having a carrier assembly mounted at a housing part for movement
relative to the housing part, wherein the carrier assembly
comprises: at least two carriers arranged with a distance from each
other; and an elongated shaft-like connector element having a
longitudinal axis and connected to the at least two carriers;
wherein the connector element has undercut sections provided at
locations where the carriers are connected to the connector
element, and wherein the carriers are plastic injection-molded
parts extending around the connector element so that each of the
carriers is non-detachably connected to the connector element by a
positive fit connection.
2. The oral hygiene implement in accordance with claim 1, wherein
the connector element is made from a metal rod and wherein the
undercut sections comprise crimped or otherwise deformed portions
of the connector element.
3. The oral hygiene implement in accordance with claim 1, wherein
the carrier assembly has at least three carriers consecutively
arranged with respect to the longitudinal axis with a distance
between neighboring carriers.
4. The oral hygiene implement in accordance with claim 3, wherein
the distance between at least two neighboring carriers in the
longitudinal direction is selected from the group consisting of a
distance of less than about 5 mm, a distance of less than about 2
mm, a distance of at least 0.8 mm, and a distance of at least 0.5
mm.
5. The oral hygiene implement in accordance with claim 1, wherein
one of the carriers forms a front carrier arranged at a front
region of the oral hygiene implement and the front carrier extends
around an end of the connector element.
6. The oral hygiene implement in accordance with claim 1, wherein
at least one of the carriers comprises at least one carrier
cleaning element having an enlarged base section around which the
injection-molded carrier extends.
7. The oral hygiene implement in accordance with claim 1, wherein
the housing part has a cavity in which the carrier assembly is
disposed.
8. The oral hygiene implement in accordance with claim 1, wherein
at least one housing cleaning element is mounted at the housing
part and extends between two of the carriers, and wherein a width
of the housing cleaning element is essentially equal to or slightly
smaller than the distance between the two carriers.
9. The oral hygiene implement in accordance with claim 8, wherein
at least two housing cleaning elements are mounted at the housing
part and extend between two of the carriers, and wherein the
connector element extends between the two housing cleaning
elements.
10. The oral hygiene implement in accordance with claim 1, further
comprising a closure element connected to the housing part and
extending over a portion of the connector element, wherein the
closure element forms at least a portion of a bearing for the
connector element.
11. The oral hygiene implement in accordance with claim 10, wherein
at least one auxiliary cleaning element is mounted on the closure
element, wherein the auxiliary cleaning element is an
injection-molded element.
12. A method of assembling an oral hygiene implement, the method
comprising the steps of: providing a carrier assembly by
injection-molding at least two carriers around undercut sections of
a connector element so that each carrier forms a non-detachable
positive-fit connection with the connector element and the carriers
are arranged with a distance; providing a housing part by a plastic
injection-molding process, wherein the housing part has a cavity
for receiving the carrier assembly; mounting the carrier assembly
at the housing part, such that the carrier assembly is borne for
movement relative to the housing part.
13. The method in accordance with claim 12, wherein the step of
providing the housing part includes mounting at least one housing
cleaning element at the housing part, and the step of mounting the
carrier assembly includes pushing the housing cleaning element in
between two of the carriers that are mutually adjacent.
14. The method in accordance with claim 12, wherein the step of
providing the housing part includes mounting at least two mutually
adjacent housing cleaning elements at the housing part, and the
step of mounting the carrier assembly includes moving a portion of
the connector element in between the two housing cleaning
elements.
15. The method in accordance with claim 12, further comprising a
step of connecting a closure element with the housing part by a
method selected from the group consisting of gluing, welding,
snap-fitting, and any combination thereof, so that the closure
element covers a portion of the connector element.
16. The method of claim 14, wherein the method includes a step of
pushing the two housing cleaning elements apart from each
other.
17. The method of claim 15, wherein the closure element is forming
at least a portion of a bearing for the connector element.
Description
FIELD OF THE INVENTION
[0001] The present invention is concerned with an oral hygiene
implement having a carrier assembly with at least two carriers
movably mounted at a housing part, in particular wherein the oral
hygiene implement is a replacement brush head for an electric
toothbrush. The present invention is also concerned with a method
of assembling an oral hygiene implement.
BACKGROUND OF THE INVENTION
[0002] It is known that an oral hygiene implement can comprise a
carrier assembly having at least one carrier that is movably
mounted at a housing of the oral hygiene implement. E.g. EP 2 335
644 B1 describes an oral cleaning section that has a carrier that
is mounted for a driven wiping motion around a longitudinal axis of
the oral hygiene implement.
[0003] It is also known that two carriers are movably mounted at a
housing of an oral hygiene implement. E.g. EP 1 485 039 B1
describes a toothbrush head having multiple bristle carriers that
are each coupled to a drive rocker.
[0004] It is an object of the present disclosure to provide an oral
hygiene implement having a carrier assembly with at least two
carriers that is improved over the known oral hygiene implements or
at least represents an alternative.
SUMMARY OF THE INVENTION
[0005] In accordance with one aspect there is provided an oral
hygiene implement, in particular a replacement brush head, that has
a carrier assembly mounted at a housing part for movement relative
to the housing part, which carrier assembly has at least two
carriers arranged with a distance to each other, and a connector
element, in particular an elongated, shaft-like connector element
that extends parallel to a longitudinal axis of the oral hygiene
implement, which connector element is connected with the at least
two carriers, wherein the connector element has undercut sections
provided at the locations where the carriers are connected with the
connector element and the carriers are plastic injection molded
parts extending around the connector element so that the carriers
are each non-detachably connected with the connector element by a
positive fit connection.
[0006] In accordance with one aspect there is provided a method of
assembling an oral hygiene implement that comprises the step of
providing a carrier assembly by injection molding at least two
carriers around undercut sections of a connector element so that
each carrier forms a non-detachable positive-fit connection with
the connector element and the carriers are arranged with a
distance, the step of providing a housing part in particular by a
plastic injection molding process, optionally wherein the housing
part has a cavity for receiving the carrier assembly, and the step
of mounting the carrier assembly at the housing part, in particular
within the cavity, such that the carrier assembly is borne for
movement relative to the housing part.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] The present disclosure will be further elucidated by a
detailed description of example embodiments and with reference to
figures. In the figures
[0008] FIG. 1 is a depiction of an example oral hygiene device
having a detachable oral hygiene implement in accordance with the
present disclosure;
[0009] FIG. 2 is a depiction of an example oral hygiene implement
in accordance with the present disclosure;
[0010] FIG. 3A is a longitudinal cut through the oral hygiene
implement shown in FIG. 2 along line A-A indicated in FIG. 2;
[0011] FIG. 3B is a longitudinal cut through the same oral hygiene
implement but along line B-B indicated in FIG. 3A;
[0012] FIG. 3C is a cross-sectional cut through the oral hygiene
implement shown in FIG. 3A along line C-C indicated in FIG. 3A;
[0013] FIG. 3D is a cross-sectional cut through the oral hygiene
implement shown in FIG. 3A along line D-D indicated in FIG. 3A;
[0014] FIG. 3E is a cross-sectional cut through the oral hygiene
implement shown in FIG. 3A along line E-E indicated in FIG. 3A;
[0015] FIG. 4 is a depiction of the head portion of another example
oral hygiene implement in accordance with the present
disclosure;
[0016] FIG. 5A is a longitudinal cut through the example oral
hygiene element shown in FIG. 4;
[0017] FIG. 5B is a cross sectional cut through the same oral
hygiene implement as shown in FIG. 4 along line G-G indicated in
FIG. 5A;
[0018] FIG. 5C is another cross sectional cut through the same oral
hygiene implement as shown in FIG. 4 along line F-F indicated in
FIG. 5A;
[0019] FIG. 5D is a cross-sectional depiction of a detail of a
closure element being snapped on a housing part of the oral hygiene
implement shown in FIG. 4; and
[0020] FIG. 6 is a top view of an example embodiment of a carrier
assembly as may be used in assembling an oral hygiene implement as
shown in FIG. 2 or FIG. 4;
DETAILED DESCRIPTION OF THE INVENTION
[0021] In accordance with the present disclosure, it is proposed to
provide a carrier assembly for the above described oral hygiene
implement by a plastic injection molding process in which at least
two carriers arranged at a distance are each non-detachably
connected with a connector element by a form-fit as each of the
injection molded carriers extends around a respective undercut
section of the connector element. The connector element may be an
elongated, rod-like element that in particular may be made from
metal and the undercut sections may then be crimped or otherwise
deformed sections of the metal rod (even so this should not be
interpreted as limiting and the undercut section of the metal rod
may be provided by grinding or by, e.g., welding a piece of metal
to the rod element or by press-fitting a hub onto the rod element
to thus realize an undercut section). The carriers are arranged
with a distance (i.e. a gap), where this distance is measured with
respect to a longitudinal direction defined by the longitudinal
extension direction of the connector element (where the
longitudinal extension direction of the oral hygiene implement is
generally connecting a first end of the oral hygiene and a second
end, which comprises the carrier assembly, and which second end is
distal to the first end). Injection molding carriers onto undercut
sections of a connector element is a relatively method by which
complex carrier assemblies can be realized.
[0022] The term "undercut section" means a deformation of the
connector element deviating from a constant shape, orientation or
area of a cross-section of the connector element perpendicular to a
longitudinal extension direction of the connector element. E.g. in
case the connector element were a rod-shaped element generally
having a circular cross-section, an undercut section may be
realized by deviating at the location of the undercut section from
the circular cross-section and having, e.g. a flattened cross
section, as may be achieved by crimping the connector element at
the location of the undercut section. In case of a connector
element having a generally flat cross section (e.g. a rectangular
cross section), an undercut section may be achieved by twisting the
orientation of the flat cross section by a certain angle at the
location of the undercut section. The undercut section generally
shall achieve that a carrier that is injection molded around the
connector element at the location of the undercut section cannot be
detached from the connector element without destroying the carrier.
The undercut section may in particular also serve for a
torque-proof fixation of the carrier at the connector element. The
length of the carrier in the longitudinal extension direction of
the connector element may in particular be longer than the
extension length of the undercut section so that the carrier
completely encompasses the undercut section and extends beyond the
undercut section. E.g. as a non-limiting example, the undercut
section may have a length of 1.0 mm and the carrier may have a
length of 1.5 mm, where the undercut section is centrally arranged
and the carrier thus extends on both side of the undercut section
by 0.25 mm--even though the undercut section must generally not be
located centrally with respect to the carrier. In some embodiments,
the connector element has a continuously changing cross-sectional
shape so that the undercut section is thus as long as the
respective carrier.
[0023] The plastic injection molded carriers may not only extend
around the undercut sections of the connector element, but at least
one carrier may also extend around an enlarged base section of a
carrier cleaning element, i.e. the carrier may not only be
injection molded around an undercut section of the connector
element but an enlarged base of a cleaning section, e.g. a fused
end of a filament tuft, may also extend into the mold cavity when
the carrier is injection molded so that the respective carrier also
extends around the enlarged base of the cleaning element. Thus, in
a step of injection molding of the at least two carriers onto the
respective undercut sections of the connector element, carrier
cleaning elements are as well connected with the carriers.
[0024] In some embodiments, at least three or at least four
carriers are consecutively arranged on the connector element, where
each of the carriers is arranged with a distance to its respective
neighboring carrier(s).
[0025] In some embodiments, one of the at least two carriers (or
three carriers, four carriers, five carriers etc.) is a front
carrier that extends around an end of the connector element (i.e.
the end of the connector element is embedded in the front carrier
and does not extend through the front carrier).
[0026] In some embodiments, at least one housing cleaning element
is mounted on the housing part of the above described oral hygiene
implement, which at least one housing cleaning element extends
between two carriers that are arranged with a distance with respect
to the longitudinal direction (i.e. the at least one housing
cleaning element extends through the gap formed between the two
carriers). Alternatively or additionally, at least two housing
cleaning elements are mounted on the housing part and both extend
between two carriers arranged with a distance with respect to the
longitudinal direction and the connector element may extend between
the two housing cleaning elements. It shall not be excluded that
the housing part has at least one further housing cleaning element
that does not extend between two carriers, but which housing
cleaning element extends, e.g. from a side of the housing part. In
some embodiments, the housing part has a cavity in which the
carrier assembly is at least partly disposed.
[0027] In some embodiments, a closure element is connected with the
housing part, which closure element extends over a portion of the
connector element (i.e. the connector element then is at least
partially enveloped or covered by the closure element). In some
embodiments, the closure element forms at least a portion of a
bearing for the connector element, in particular either the closure
element forms a bearing for the connector element or the closure
element and the housing together form a bearing for the connector
element. Alternatively or additionally, an auxiliary cleaning
element may be mounted on the closure element.
[0028] Each of the herein mentioned cleaning elements (as long as
not otherwise stated) may be realized by a single plastic filament
(e.g. a polyamide filament having a diameter of about 50-300
micrometer, even though other filament diameters are considered as
well), by a tuft of at least two or more of such filaments or by an
elastomeric element, e.g. an injection molded thermoplastic
elastomer (TPE) element such as a gum massaging finger. Elastomeric
cleaning elements may be injection molded onto a carrier or onto
the housing part in an injection molding step.
[0029] FIG. 1 is a depiction of an example embodiment of an oral
hygiene device 1, here realized as an electric toothbrush. The oral
hygiene device 1 generally comprises an oral hygiene implement 10
and a handle section 20. Here, the oral hygiene implement 10 is
realized as a replacement brush head that may in particular be
attachable to and detachable from the handle section 20. The handle
section 20 may comprise a drive with a motor and a drive shaft for
transferring a driving motion to the oral hygiene implement 10.
[0030] Instead of being realized as an electric toothbrush, the
oral hygiene device may also be realized as a flossing device, a
gum massage device, an interdental cleaning device etc. In
accordance with the present disclosure, an oral hygiene implement
may alternatively be realized as a (in particular detachable) head
section of a flossing device, gum massaging device, interdental
cleaning device etc.
[0031] In the following, an example embodiment of an oral hygiene
implement 100 is discussed with reference to FIGS. 2 and 3A-3E.
FIGS. 3A-3E are sectional drawings of the oral hygiene implement
100 shown in FIG. 2. Same reference numerals are used to indicate
the same features in these figures.
[0032] FIG. 2 is a top view onto the oral hygiene implement 100,
here realized as a replacement brush head for detachable attachment
to a handle section of an oral hygiene device. The oral hygiene
implement 100 has a head section 110 and an attachment section 120.
The oral hygiene implement 100 comprises a carrier assembly 200
mounted at a housing part 300 for driven movement. The housing 300
has a tubular portion 301 that essentially forms the outer part of
the attachment section 120 and further forms a scoop-like frame 310
having side walls 310A and 310B and a bottom wall 320 (e.g. shown
more clearly in FIGS. 3A and 3D) that together define a cavity 330
in which the carrier assembly 200 is partly disposed. The bottom
wall 320 may in particular be realized as a separate element that
can be inserted (e.g. as shown in FIG. 3D) in between the side
walls so that the housing part 300 is realized in the shown
embodiment by two separately made parts (which obviously is an
optional feature). Carrier cleaning elements 211, 221, 231, 241
such as bristle tufts or elastomeric elements are mounted on
respective carriers 210, 220, 230, 240 of the carrier assembly 200
(as described in more detail with respect to FIG. 3C), even though
the shown embodiment is considered as non-limiting and the number
of carrier cleaning elements per carrier can be freely chosen and
may even be zero. The four carriers 210, 220, 230, 240 of the shown
embodiment are mounted with a distance to each other with respect
to a longitudinal direction L (see also description of FIG. 3A
concerning the distances). The longitudinal direction L coincides
with the longitudinal extension direction of the oral hygiene
implement 100 and with the longitudinal extension direction of the
mounted connector element 290 (better seen in FIG. 3A). The oral
hygiene implement 100 generally extends in the longitudinal
direction L that connects a first end 101 (the attachment end) and
a second end 102 (the treatment end) of the oral hygiene implement
100. Housing cleaning elements 311, 321, 331 are shown, which are
mounted at the housing part, in particular at the bottom wall 320
(as described in more detail with respect to FIG. 3D) and here
pairs of these housing cleaning elements 311, 321, 331 extend
between neighboring pair of carriers 220, 230, and 240, e.g.
housing cleaning elements 321 extend between carriers 220 and 230
and housing cleaning elements 331 extend between carriers 230 and
240. The carrier 210 that is here defining the second end 102 of
the oral hygiene implement 100 is here realized as a front
carrier.
[0033] FIG. 3A is a longitudinal cut through the oral hygiene
implement 100 shown in FIG. 2 along line A-A indicated in FIG. 2.
As mentioned before, the carrier assembly 200 shown here has four
carriers 210, 220, 230, and 240 that are consecutively arranged
with respect to the longitudinal direction L and that are arranged
with a distance in longitudinal direction L to their respective
carrier neighbor(s). The distance (or gap width) between the
carriers 230 and 240 is d1 and is identical to the distance d2
between the carriers 220 and 230. A distance d3 between the carrier
210, which is here realized as a front carrier, and the carrier 220
is larger than distances d1 or d2. This example is non-limiting and
generally the distances between carriers may be identical or
different to each other. Depending on the design of the carriers,
the gap width between neighboring carriers may also be non-uniform
and may thus have a minimum and a maximum gap width. A constant gap
width may be chosen if housing cleaning elements extend between two
neighboring carriers. The carriers 210, 220, 230, and 240 are each
connected with a connector element 290, which connector element 290
may be realized as a connector rod, in particular as a metal
connector rod. The connector element 290 here has four undercut
sections 291, 292, 293, and 294 and each of the four carriers 210,
220, 230, and 240 is provided around one of the four undercut
sections 291, 292, 293, and 294 such that the respective carrier
extends around a respective undercut section to form a
non-detachable positive-fit connection. In the plane of the
longitudinal cut shown in FIG. 3A, the undercut sections 291 to 294
are formed by an enlarged diameter of the here rod-shaped connector
element (and by a corresponding thinning of the connector element
in a direction perpendicular to the shown longitudinal cut, as can
be seen in FIG. 3B).
[0034] In general, the carrier assembly has at least two carriers
that are arranged with a distance in longitudinal direction, but
embodiments with at least three, at least four (as discussed) or
even more carriers such as five, six etc. are considered as
well.
[0035] The four carrier elements 210, 220, 230, and 240 of the
shown example embodiment are made by a plastic injection molding
process (as will be explained further below, at least one of the
carrier elements may additionally also extend around an enlarged
base of a carrier cleaning element). The first carrier 210 is here
realized as a front carrier, i.e. the front carrier extends around
an end 299 of the connector element 290. In other embodiments, the
connector element extends through all carriers and the respective
end 299 of the connector element may then be borne for driven
motion of the carrier assembly.
[0036] As can be seen in FIG. 3A, the housing cleaning elements
311, 321, 331 are mounted at the housing part. In the shown
embodiment and with reference also to FIG. 2, in each case two of
the housing cleaning elements 311, 321 or 331 are respectively
arranged in a row perpendicular to the longitudinal direction L.
Here, the housing cleaning elements 311, 321, 331 are mounted on an
inner surface of the bottom wall 320 so that the housing cleaning
elements 311, 321, 331 extend from the bottom wall 320 through the
cavity 330. Housing cleaning elements 331 are extending between the
two carriers 230 and 240, housing cleaning element 321 extend
between carriers 220 and 230, and housing cleaning element 311
essentially extend between carriers 210 and 220. The width of the
housing cleaning elements 321 and 331 in longitudinal direction L
is about the distance d1=d2 between the neighboring carriers 220
and 230 and 230 and 240. Thus, a dense field of carrier cleaning
elements 221, 231, 241 and housing cleaning elements 311, 321, 331
can be achieved. The distance d1, d2 between neighboring carriers
may be set to be at least 0.5 mm, optionally at least 0.8 mm. The
distance between neighboring carriers may be set to be up to 5 mm,
in particular up to 2 mm, and further in particular up to 1.5 mm.
In one example, the width of at least one of the housing cleaning
elements realized as a filament tuft is 0.8 mm and thus the gap
width (distance) of the neighboring carriers between which the
housing cleaning element extends is chosen to be 0.8 mm plus two
times a security distance of between 0.1 to 0.3 mm, so that the
distance is thus in a range of between 1.0 mm and 1.4 mm. In
another example, and least one of the housing cleaning elements is
realized as an elastomeric element having a width of 0.4 mm and the
gap width (distance) between the respective carriers may then be
chosen to be 0.6 mm. Further examples lie within the routine
discretion of the skilled person.
[0037] In the shown embodiment, the connector element 290 extends
between each of the pairs of housing cleaning elements 311, 321,
and 331, i.e. the respective housing cleaning elements are arranged
at the sides of the connector element. E.g. in the shown
embodiment, the housing cleaning elements of each row may be
arranged with a distance allowing the connector element to extend
between the two housing cleaning elements without the need to push
the housing cleaning elements to the side. As shown in FIG. 3D for
the carrier cleaning elements 221, at least one of the housing
cleaning elements 311, 321, 331 may have an enlarged base that is
enclosed in the material of the bottom wall 320. The bottom wall
320 may have been made in a plastic injection molding step in which
the enlarged bases of the housing cleaning elements extended into
the mold cavity and were enclosed by the injection molded plastic
material. In other embodiments, the housing cleaning elements were
directly connected with the housing part, either in a plastic
injection molding step as just described or by a standard anchor
tufting process. The housing cleaning elements may also be realized
as injection molded elastomeric cleaning elements that may be
connected with the housing part by an additional injection molding
step. Further housing cleaning elements may as well be present,
e.g. in some embodiments, elastomeric cleaning elements may have
been disposed on the side walls 310A, 310B or other portions of the
housing part 300 (as depicted in FIG. 4).
[0038] The connector element 290 is here also borne by a bearing
309 formed in the housing part 300. An end 298 of the connector
element 290 may have been press-fitted into a motion transmitter
element 400 that is arranged to receive a drive shaft from a handle
section of an oral hygiene device. Thus, a motion from a motor of
the handle section can be transferred via the drive shaft to the
motion transmitter 400 and then to the connector element 290, so
that, e.g., an oscillating wiping motion of the carriers 210, 220,
230, and 240 around the longitudinal center axis of the connector
element 290 is achieved.
[0039] In the example embodiment, also an optional closure element
350 is shown, which closure element 350 envelopes a portion of the
connector element 290 and, as can also be seen in FIGS. 3B and 3E,
forms a bearing 359 for the connector element 290. With reference
to FIGS. 3B and 3E, the closure element 350 here comprises two wing
sections 351 and 352 that are hinged together by a hinge section
353. In the mounted state, the two wing sections 351 and 352
together define a bearing 359 for the connector element 290. While
not shown for the present example embodiment, at least one
auxiliary cleaning element may be mounted at the closure element
350.
[0040] FIG. 3B is a longitudinal cut through the oral hygiene
implement 100 shown in FIG. 2 along line B-B indicated in FIG. 3A.
As has already been described, it can be seen that the undercut
sections 291, 292, 293, and 294 are formed by a narrowing of the
diameter of the rod element 290 in the plane of the cut shown in
FIG. 3B. The carriers 210, 220, 230, and 240 are each formed around
one of the undercut sections 291, 292, 293, and 294, respectively,
of the connector element 290. The wing sections 351 and 352 of the
closure element 350 form a tubular bearing 359 for the connector
element 290. In cases where the connector element is made from
metal, the closure element may in particular be made from a plastic
material that has a low friction coefficient with respect to the
metal material of the connector element and generally the material
of the closure element may be chosen to have a low friction (and
potentially self-lubricating properties) with respect to the
material of the connector element 290. In some embodiments, the
closure element 350 may at least in the area of the bearing 359 be
coated with a material that has a low friction coefficient with
respect to the material of the connector element (and additionally
or alternatively, a coating that has a good wear resistance), e.g.
the closure element 350 may have a Teflon coating at least on the
contact surfaces of the bearing 359.
[0041] FIG. 3C is a cross-sectional cut through the oral hygiene
implement 100 shown in FIG. 2 along line C-C indicated in FIG. 2.
The cross-sectional cut extends through the bottom wall 320 and the
housing cleaning elements 331. In the shown embodiment, the two
housing cleaning elements 331 are mounted on the bottom wall 320.
Here, the housing cleaning elements 331 each have an enlarged base
332 (e.g. generated by fusing a tuft of plastic filaments made from
a fusible plastic material such as polyamide--e.g. PA6--under the
application of heat so that the filament ends melt and form a
blob). As previously explained, the bottom wall 320 may be made in
a plastic injection molding step (either as an element separate
from the remainder of the housing part 300 or as an integral
portion of the housing part 300). The expanded bases 332 of the
housing cleaning elements 331 may thus extend into a cavity into
which the plastic material to form the bottom wall 320 is injected
so that the enlarged bases 332 of the housing cleaning elements 331
become non-detachably enclosed in the plastic material of the
carrier 220.
[0042] In the shown embodiment, the sidewalls 310A and 310B and the
bottom wall 320 have matched longitudinally extending projections
and depressions that are here realized by dovetail-shaped
projections 321A and 321B of the bottom wall 320 that are in
form-fit connection with depressions 311A and 311B realized in the
side walls 310A and 310B, respectively. Thus, the here separate
bottom wall 320 can be slid into the U-shaped fork formed by the
side-walls 310A and 310B to form the scoop-like frame 310. The
bottom wall 320, when made as a separate element, may comprise a
snap connector element for snapping the bottom wall 320 to a snap
partner at the housing part 300, where this snap connection may in
particular be non-detachable.
[0043] FIG. 3D is a cross-sectional cut through the oral hygiene
implement 100 shown in FIG. 2 along line D-D indicated in FIG. 2.
The cross-sectional cut extends through the carrier 220 and the
carrier cleaning elements 221. In the shown embodiment, the four
carrier cleaning elements 221 are mounted on the carrier 220. Here,
the carrier cleaning elements 221 each have an enlarged base 222
(e.g. generated by fusing a tuft of plastic filaments made from a
fusible plastic material such as polyamide--e.g. PA6--under the
application of heat so that the filament ends melt and form a
blob). As previously explained, the carrier 220 may be made in a
plastic injection molding step. The expanded bases 222 of the
carrier cleaning elements 221 and the undercut section 292 of the
connector element 290 may thus extend into a cavity into which the
plastic material to form the carrier 220 is injected so that the
undercut section 292 and the enlarged bases 222 are non-detachably
enclosed in the plastic material of the carrier 220. The carrier
220 (together with the whole carrier assembly) is here mounted for
a wiping motion (i.e. an oscillatory rotation) indicated by double
arrow W around rotation axis R, where the rotation axis R may
coincide with the longitudinal direction L or may at least be
parallel to the longitudinal direction L.
[0044] FIG. 3E is a cross-sectional cut through the oral hygiene
implement 100 shown in FIG. 2 along line E-E indicated in FIG. 3A.
The cross-sectional cut extends through the closure element 350. In
the shown embodiment, the closure element 350 provides a bearing
359 for the connector element 290. The closure element 350 may
comprise, as already discussed, two wing sections 351 and 352 that
are connected only via a flexible hinge section 353 (e.g. realized
as a living hinge) so that the two wing sections 351, 352 can be
bend apart and can then be snapped over the connector element 290.
After assembly of the shown example embodiment, the wing sections
351, 352 of the closure element 350 will then be held in place by
the side walls 310A, 310B of the housing part 300 via matched
mating partners 354A, 354B and 310AA, 310BB realized at the wing
sections 351, 352 and at the side walls 310A, 310B, respectively.
The carrier 210 may have projections 219 around which the closure
element 350 extends, and which projections 219 engage behind the
mounted closure element 350 as can be seen in FIG. 3B. In an
assembly process, the carrier assembly 200 together with the
closure element 350 mounted around the connector element 350 and
together with the here separate bottom wall 320 may together be
slid into the fork formed by the side walls 310A, 310B.
[0045] FIG. 4 is a schematic depiction of a front section of
another example embodiment of an oral hygiene implement 100A in
accordance with the present disclosure. FIGS. 5A, 5B, 5C, and 5D
show sectional cuts through the oral hygiene implement 100A.
Identical features in FIGS. 4, 5A, 5B, 5C, and 5D are identified by
same reference numerals. In the following, reference is made to all
FIGS. 4, 5A, 5B, 5C and 5D, where one of the figures may be
highlighted in the description of a particular feature. FIG. 5A is
a longitudinal cut through the oral hygiene element 100A shown in
FIG. 4, which cut extends centrally through the longitudinally
extending connector element 290A. FIG. 5B is a cross sectional cut
through the oral hygiene implement shown in FIG. 4 through a plane
indicated by line F-F shown in FIG. 5A. FIG. 5C is a cross
sectional cut through the oral hygiene implement shown in FIG. 4
through a plane indicated by line G-G shown in FIG. 5A. FIG. 5D is
a detail of a longitudinal cut extending along a plane indicated by
line H-H shown in FIG. 5C.
[0046] The embodiment shown in FIGS. 4, 5A, 5B, and 5C is similar
to the embodiment shown in FIG. 2, namely in that the oral hygiene
implement 100A has a carrier assembly 200A comprising four carriers
210A, 220A, 230A, and 240A that are arranged at locations of
undercut sections 291A, 292A, 293A, and 294A (see FIG. 5A) of a
connector element 290A. The carrier assembly 200A is partly
disposed in a scoop-like cavity 330 formed by side walls 310C and
310D and a bottom wall 320A of a housing part 300A. One difference
to the previous example embodiment is that the bottom wall 320A has
an outer layer 390A made from an elastomeric material, which outer
layer 390A may serve to protect soft tissue from contact with hard
plastic material. In some embodiments, the outer layer 390A is
textured. Then the outer layer 390A may be used as a tongue
scraper. Additionally or alternatively, at least one elastomeric
housing cleaning element 391A may be provided, which elastomeric
housing cleaning element 391A may in particular be made from the
same elastomeric material (and optionally also be made in the same
injection molding step) as the outer layer 390A. The elastomeric
housing cleaning element 391A may in particular be provided at a
side wall 310C, 310D of the housing part 300A and the elastomeric
housing cleaning element 391A may extend from the side wall 310C or
310D parallel to one of the housing cleaning elements 221A, 231A,
241A or one of the carrier cleaning elements 311A, 321A. In the
shown embodiment, elastomeric housing cleaning elements 391A extend
on each side of the three rows of carrier cleaning elements 221A,
231A, and 241A, respectively.
[0047] As can be seen in FIG. 5B, the housing cleaning elements
311A may have an enlarged base 312A that may be partially embedded
in the material of the bottom wall 320A and partially in the
material of the outer layer 390A.
[0048] A closure element 350A may be present, on which closure
element 250A at least one auxiliary cleaning element 358A may be
mounted, in particular an elastomeric cleaning element that may be
mounted onto the closure element 350A by means of an injection
molding process (i.e. the auxiliary cleaning element 358A may then
be made from a thermoplastic elastomer--TPE). The closure element
350A may comprise a snap connector 354A by which the closure
element 350A is snapped onto a snap projection 315A of the housing
part 300A (see FIG. 5D).
[0049] FIG. 6 is an isolated depiction of an example embodiment of
a carrier assembly 200B. The carrier assembly 200B comprises here
four consecutively carriers 210B, 220B, 230B, 240B and a connector
element 290B, that may be realized as a connector rod, in
particular as a metal connector rod. The first carrier 210B is
realized as a front carrier and thus an end of the connector
element 290B is embedded in the material of the front carrier. The
front carrier 210B comprises three carrier cleaning elements 211B
that are inclined in forward direction. Each of the three further
carriers 220B, 230B, and 240B comprises a row of four carrier
cleaning elements 221B, 231B, and 241B, respectively.
[0050] It is stated here again that the number and location of the
cleaning elements shown in the present example embodiments shall
not be considered as limiting and the features of the oral hygiene
implement shall each be considered as being disclosed independent
from each other if not inherently connected. This also applies for
the number and location of carriers of the carrier assembly.
[0051] A method of manufacturing an oral cleaning implement in
accordance with the present disclosure comprises the following
steps: [0052] (1) providing a carrier assembly by injection molding
at least two carriers around undercut sections of a connector
element so that each carrier forms a non-detachable positive-fit
connection with the connector element, whereby the carriers are
arranged with a distance; [0053] (2) providing a housing part, e.g.
by a plastic injection molding process; the housing part may have a
cavity for receiving the carrier assembly; [0054] (3) mounting the
carrier assembly at the housing part (it may be received in the
cavity) such that the carrier assembly is borne for movement
relative to the housing part.
[0055] The step (2) may include mounting at least one housing
cleaning element at the housing part and the step (3) may include
pushing the housing cleaning element in between two of the carriers
that neighbor each other. Further additionally or alternatively,
step (2) may include mounting at least two neighboring housing
cleaning elements at the housing part and step (3) may include
pushing the two housing cleaning elements apart from each other and
moving a portion of the connector element in between the two
housing cleaning elements. Additionally or alternatively, a further
step (4) of connecting a closure element with the housing part,
e.g. by means of gluing, welding, or snap-fitting, may be present
and the closure element may then cover a portion of the connector
element. Optionally, the closure element and the housing part
together form a bearing for the connector element. Further
potential assembly steps have been described with respect to FIGS.
1 to 6.
[0056] The dimensions and values disclosed herein are not to be
understood as being strictly limited to the exact numerical values
recited. Instead, unless otherwise specified, each such dimension
is intended to mean both the recited value and a functionally
equivalent range surrounding that value. For example, a dimension
disclosed as "40 mm" is intended to mean "about 40 mm."
[0057] Every document cited herein, including any cross referenced
or related patent or application and any patent application or
patent to which this application claims priority or benefit
thereof, is hereby incorporated herein by reference in its entirety
unless expressly excluded or otherwise limited. The citation of any
document is not an admission that it is prior art with respect to
any invention disclosed or claimed herein or that it alone, or in
any combination with any other reference or references, teaches,
suggests or discloses any such invention. Further, to the extent
that any meaning or definition of a term in this document conflicts
with any meaning or definition of the same term in a document
incorporated by reference, the meaning or definition assigned to
that term in this document shall govern.
[0058] While particular embodiments of the present invention have
been illustrated and described, it would be obvious to those
skilled in the art that various other changes and modifications can
be made without departing from the spirit and scope of the
invention. It is therefore intended to cover in the appended claims
all such changes and modifications that are within the scope of
this invention.
* * * * *