U.S. patent application number 10/104617 was filed with the patent office on 2002-10-03 for toothbrush.
This patent application is currently assigned to Unilever Home & Personal Care USA, Division of Conopco, Inc.. Invention is credited to Davies, Richard Huw.
Application Number | 20020138931 10/104617 |
Document ID | / |
Family ID | 8181863 |
Filed Date | 2002-10-03 |
United States Patent
Application |
20020138931 |
Kind Code |
A1 |
Davies, Richard Huw |
October 3, 2002 |
Toothbrush
Abstract
Toothbrush comprising a handle (1) and a head (2), the handle
(1) made out of a plastics material and having a general handle
surface (3) and a grip portion (4), characterized in that the grip
portion (4) comprises a projection (5) made out of said plastics
material and which projects from the handle surface (3), said
projection (5) having a gripping surface (6) which is raised from
the handle surface (3) and has an elastomeric edge (7).
Inventors: |
Davies, Richard Huw;
(Gaggiano, IT) |
Correspondence
Address: |
UNILEVER
PATENT DEPARTMENT
45 RIVER ROAD
EDGEWATER
NJ
07020
US
|
Assignee: |
Unilever Home & Personal Care
USA, Division of Conopco, Inc.
|
Family ID: |
8181863 |
Appl. No.: |
10/104617 |
Filed: |
March 22, 2002 |
Current U.S.
Class: |
15/167.1 ;
15/143.1; D4/104 |
Current CPC
Class: |
A46B 5/02 20130101 |
Class at
Publication: |
15/167.1 ;
15/143.1; D4/104 |
International
Class: |
A46B 005/02 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 30, 2001 |
EP |
01303092.9 |
Claims
1. Toothbrush comprising a handle (1) and a head (2), the handle
(1) made out of a plastics material and having a general handle
surface (3) and a grip portion (4), characterised in that the grip
portion (4) comprises a projection (5) made out of said plastics
material and which projects from the handle surface (3), said
projection (5) having a gripping surface (6) which is raised from
the handle surface (3) and has an elastomeric edge (7).
2. Toothbrush according to claim 1, characterised in that the
elastomeric edge (7) extends from the handle surface (3) such that
it provides a flush surface with the gripping surface (6) of the
projection (5).
3. Toothbrush according to claim 1, characterised in that the
elastomeric edge (7) stands proud of the gripping surface (6) of
the projection (5).
4. Toothbrush according to claim 1, characterised in that the grip
portion (4) comprises an array of projections (5) on the handle
surface (3).
5. Toothbrush according to claim 1, characterised in that the grip
portion (4) comprises an array of longitudinally spaced projections
(5).
6. Toothbrush according to claim 1, characterised in that the head
(2) comprises flexibly linked segments linked by an elastomeric
material which is unitary with the elastomeric edge (7) in the grip
portion (4).
7. Toothbrush according to claim 1, characterised in that the grip
portion (4) is located on a top side of the handle (1).
8. Toothbrush according to any of claims 1-6, characterised in that
the grip portion (4) is located on a bottom surface of the handle
(1).
Description
[0001] The present invention relates to a toothbrush with an
improved handle portion.
[0002] Nearly every toothbrush in the prior art has a handle
portion and a bristle-bearing head. The handle portion is often
ergonomically designed to facilitate the grip made by the hand
during use. Usually this is in the form of a projection thus
providing extra purchase to the grip.
[0003] Over the past several years a number of new toothbrushes
have been introduced into the market. For instance, the
Colgate-Palmolive Company now sells a product known as the
Precision brush. Besides a special brush head, the Precision
product in one version includes a rippled handle whose upper and
lower surfaces are covered with a material different from that of
the lateral and front portions of the handle. Only small
differences in hardness distinguish the upper/lower surface
material (86 Shore Hardness) from the lateral/front material
(95-100 Shore Hardness). U.S. Pat. Des. 342,160 (Curtis et al.) and
U.S. Pat. Des. 342,162 (Curtis et al.) cover the design aspects of
the Colgate-Palmolive product.
[0004] A similar design concept has been incorporated into the
Crest Complete brush, a product of the Procter & Gamble
Company. FIG. 1 of WO 91/19437 (Volpenhein et al.) illustrates the
Crest Complete brush. A substantial portion of both the upper and
lower surfaces of the handle are covered by strips of a material
(89 Shore Hardness) leaving the lateral sides (95-100 Shore
Hardness) uncovered.
[0005] Dual material handles have also been introduced by the
SmithKline Beecham Corporation under the Aqua Fresh trademark.
Similar to its competitors, a very substantial part of the upper
and lower surfaces of the handle are covered by a material (88
Shore Hardness) different from the remaining material (95-100 Shore
Hardness) of the handle. A related brush is illustrated in U.S.
Pat. Des. 328,977 (Halm).
[0006] U.S. Pat. Des. 334,288 (Witzig-Jaggi) describes a dual
material toothbrush wherein material on an upper surface of the
handle exhibits a sloping change of thickness.
[0007] Utilization of dual materials has been mainly for aesthetic
purposes, and only secondarily meant to improve grippability of the
handle.
[0008] Another recent development in toothbrush technology has been
the use of corrugated handles. WO 93/15627 (Halm) describes a
handle with an integral corrugated core surrounded by an
elastomeric region. The corrugated core provides resiliency to the
handle. This corrugation has also been utilized in DE 4,222,931
(Henkel). Therein is reported a ribbed handle with each of the ribs
being of square cross section.
[0009] There have been many innovations in this area as can be seen
through the above briefly described patents. Nevertheless, there
remains room for improved models.
[0010] Accordingly, it is an object of the present invention to
provide a toothbrush that can be manipulated with less fatigue than
typical commercial toothbrushes.
[0011] It is still another object of the present invention to
provide a toothbrush with a feature that reduces slip and that
allows for improved grippability particularly when the brush is
wet.
[0012] Accordingly, the present invention provides a toothbrush
comprising a handle (1) and a head (2), the handle (1) made out of
a plastics material and having a general handle surface (3) and a
grip portion (4), characterised in that the grip portion (4)
comprises a projection (5) made out of said plastics material and
which projects from the handle surface (3), said projection (5)
having a gripping surface (6) which is raised from the handle
surface (3) and has an elastomeric edge (7).
[0013] The general handle surface is the surface of the handle
which does not form part of the projection. The projection is meant
to provide a gripping surface which is raised in relation to the
general handle surface.
[0014] Optimally, the plastic utilized for the handle should have a
Shore Hardness value ranging from about 95 to 100. Shore Hardness
values for the elastomeric material preferably range from 5 to 75,
optimally from 20 to 65. Typical plastics that can be utilized for
the present invention are nylon, polyethylene, polycarbonate,
polyethylene terephthalate, polyacrylate, polymethylmethacrylate
and styrene/acrylonitrile (SAN). Most preferred is SAN.
[0015] Typical materials for the elastomeric edge are rubber and
polyurethane, the former being selected from the group consisting
of polyisobutylene, polypropylene and polybutadiene. Most preferred
is Santoprene, a grade of polypropylene rubber available from the
Monsanto Company, and Buna N rubber.
[0016] By providing an elastomeric edge to a projection from the
handle a user will experience an improved grip and hence less
strain in manipulating the toothbrush. Preferably the elastomeric
material extends from a handle surface so as to be at least level
with a top surface of the projection to provide the best grip but
an improved grip can nevertheless be obtained by having an
elastomeric section which stands proud of the projection.
Preferably, however, this is not the case and the elastomer
provides a flush surface with the raised grip surface of the
projection.
[0017] The projection may be partially or wholly surrounded by the
elastomeric material. By partially is meant that the projection has
at least along one of its sides an elastomeric material which can
improve the grip of the grip portion. Preferably, the projection is
sized such that a whole projection may be covered by the hand
during use. For example, the user usually grips the top surface of
the handle with the thumb during use. As such, it would be
preferable for a projection on the top surface of the handle to be
sized such that it may be completely covered under a thumb.
Preferably, the projection is surrounded on all sides by an
elastomeric material such that the elastomeric edge is the
perimeter of the gripping surface of the projection.
[0018] The grip portion of the brush is preferably located on a top
surface of the handle of the brush. However, it is also possible
for the brush to have a grip portion on a bottom surface of the
handle. Of course, a brush may have a grip portion according to the
invention on both a bottom and a top surface of the handle.
[0019] It is also feasible for there to be provided an array of
projections which may be spaced in any fashion, e.g.
longitudinally, circumferentially or randomly over the grip portion
of the handle. Where this is the case, the array shall be sized so
as to present a grip portion ideally suited on a toothbrush.
[0020] To provide an improved bonding between the elastomeris edge
and the plastics material of the handle and the projection the
elastomer may actually sit in a groove formed in the surface of the
handle around the projection. This increases the surface area
between the elastomer and the plastics material thus improving
bonding during moulding.
[0021] Another feature that may be included with the toothbrush is
that of a circumferential anti-slip structure on the handle. This
structure will circumscribe the surfaces of the handle.
Mechanically this semi-ring shape has the advantage, in combination
with the projections on the grip portion, that a user's grip along
the grip portion will have elastomer surfaces not only on an
opposing side but also laterally along edges of the handle. It has
been estimated that a significant percentage of the population at
some point in their brushing technique grip sides of the
toothbrush. Elastomer in the form of a ring provides the user a
target area for holding but does not force gripping at any
predisposed angular orientation. This allows for holding the
toothbrush in a user's most natural or habitual manner.
[0022] Manufacture of the toothbrush handle involves formation
first of the plastics material of the handle, perhaps with
appropriate hollow areas for receipt of the elastomer material.
Thereafter, the arm is placed into a mold and liquefied elastomer
is injected thereinto filling out spaces within the arm and cavity
of the mold. The grip portion and the semi-ring shape anti-roll
structures may thereby be formed unitarily perhaps along with any
other area of the brush which utilises an elastomeric material. For
example, the brush head may comprise segments which are flexiblly
linked to one another by an elastomeric link. Such a link may be
integral with the elastomer in the grip portion and they will be
manufactured in a single injection moulding step.
[0023] Embodiments according to the invention will now be described
in detail with reference to the following figures.
[0024] FIG. 1 is a perspective view of part of a toothbrush
embodiment according to the invention.
[0025] FIG. 2 is a cross section of a grip portion of a toothbrush
embodiment according to the invention.
[0026] FIG. 3 is another cross section of a grip portion of a
toothbrush embodiment according to the invention.
[0027] FIG. 4 is yet another cross section of a grip portion of a
toothbrush embodiment according to the invention.
[0028] FIGS. 5, 6 and 7 are of a particularly preferred embodiment
according to the invention.
[0029] In detail, FIG. 1 shows an embodiment according to the
invention. There is disclosed a toothbrush comprising a handle (1)
and a head (2), the handle comprising a grip portion (4) with a
projection (5) which has a gripping surface (6) and an elastomeric
edge (7).
[0030] In this particular embodiment there are three raised
sections each surrounded by elastomeric material. There may be any
number of raised sections to provide an improved grip for the user.
Also, in this embodiment the elastomeric material is not shown to
connect each of the raised sections. Since the elastomeric material
is usually injection moulded it is preferred that any elastomeric
section is connected via a channel to any others present on the
brush so that a single injection moulding point may be employed to
provide for all the elastomeric regions of the brush in one go.
This is particularly relevant where there is another elastomeric
region in the brush which is remote from the grip portion. For
example, the brush may have an articulated head section which is
flexible due to the presence of an elastomeric material suitably
directed for providing flexibility.
[0031] FIG. 2 shows a cross-section of a grip portion of a
toothbrush according to the emodiment of FIG. 1. Dislcosed is a
general handle surface (3), a projection and a gripping surface (6)
on said projection, and an elastomeric edge (7). In this embodiment
the elastomeric edge is flush with the gripping surface of the
projection.
[0032] In FIG. 3 is disclosed another cross-section of a brush
according to an embodiment of the invention. In this brush the grip
portion comprises an elastomeric edge (7) which stands proud of the
gripping surface (6).
[0033] This figure also discloses a groove around the edge of the
projection which provides an increased surface area between the
elastomer and the plastics material of the handle to facilitate
binding of the one to the other during moulding. In FIG. 4 is
disclosed a projection in the form of a ramp and only has an
elastomeric edge at one side.
[0034] FIG. 5 discloses a toothbrush according to an embodiment of
the invention. The brush comprises a grip portion (4) in the form
of an array of longitudinally spaced projections (6) each with an
elastomeric edge (7).
[0035] FIG. 6 discloses a plan view of the brush according to FIG.
5.
[0036] FIG. 7 discloses a view of a bottom side of the brush
according to FIGS. 5 and 6. Shown are circumferential anti-slip
rings (8) which extend from the elastomeric edges of the
projections. This embodiment also shows a brush head which is
flexible by way of elastomeric material links (9) between fixed
bristle bearing sections of the head (10). The elastomer in this
brush could be made in one injection moulding step thanks to a
continuous link of elastomer between the grip portion and the
head.
* * * * *