EP1098579A1 - A grooming implement - Google Patents
A grooming implementInfo
- Publication number
- EP1098579A1 EP1098579A1 EP99935619A EP99935619A EP1098579A1 EP 1098579 A1 EP1098579 A1 EP 1098579A1 EP 99935619 A EP99935619 A EP 99935619A EP 99935619 A EP99935619 A EP 99935619A EP 1098579 A1 EP1098579 A1 EP 1098579A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- head
- elastomer
- handle
- segments
- joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B9/00—Arrangements of the bristles in the brush body
- A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
- A46B9/026—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups where the surface of the brush body or carrier is not in one plane, e.g. not flat
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B5/00—Brush bodies; Handles integral with brushware
- A46B5/002—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions
- A46B5/0025—Brushes with elastically deformable heads that change shape during use
Definitions
- the present invention relates to a personal grooming implement, such as a toothbrush, comprising a segmented, articulating head attached at one end to a handle, the segments being disposed longitudinally along the head and jointed to each other by an elastomer which is preferably fused to each segment.
- the joint nearest the free end of the head has a groove on its upper surface to improve its flexibility relative to the other joints, thus providing for more uniform bending of the head.
- a further drawback of conventional brushes is that pressing the brush sufficiently hard against the teeth to get good cleaning risks damaging or discomforting the softer, adjacent gums. To a certain extent this can be solved by modifying the configuration of the brush, or by varying bristle hardness or length, though again, a single configuration cannot be optimum for all circumstances.
- WO 98/27847 discloses the use of elastomers of different hardness as a means of controlling individual joint flexibility, in particular the use of a softer elastomer at the tip joint. The use of multiple elastomer types has the disadvantage however of complicating the manufacturing procedure.
- a personal grooming implement comprising a handle having two ends, and an articulated head connected to one end of the handle, the head having handle and tip ends, upper and lower faces and comprising three or more segments, the handle end being connected to the handle, the segments being spaced along a longitudinal axis defined by the handle and tip ends of the head and being joined to adjacent segments by joints made of an elastomer which extend transversely across the head, whereby each segment can articulate relative to neighbouring segments, at least one of the segments comprising a grooming means on an upper face thereof, the elastomer in each joint extending to the lower face of the head, characterised in that, in the joint nearest the tip end of the head, the elastomer only partially fills the joint such that there remains a groove in the upper face of the head, the remaining joints being completely filled with elastomer or partially filled such that grooves on the upper surface are of lesser depth than that of the tip joint, the flexibility of the tip joint being thereby increased relative to remaining
- the personal grooming implement of this invention can be any implement of the type that has a sufficiently elongated handle for the user to grip and, disposed at one end of the handle, a segmented head comprising a grooming means.
- the implement can, for example be a toothbrush, hairbrush or a massaging implement. More especially, it is a toothbrush.
- At least one of the head segments comprises a grooming means.
- each segment comprises a grooming means.
- the grooming means can take the form of bristles, combing teeth, polishing materials, rubber massage pads and the like.
- the implement is a toothbrush wherein the grooming means comprises a plurality of bristles extending from the segments of the head.
- the head can be detachably connected to the handle, for example to permit replacement of the head when bristles become worn, in which case the head has a point of attachment for the handle.
- a first head segment can be continuous with the handle.
- the handle and a first head segment are a single piece formed by injection moulding.
- the handle and all of the head segments are formed within a single mould by injection moulding.
- the head is of generally flattened construction having opposed upper and lower faces and the head also has a transverse axis lying orthogonal to the longitudinal axis and generally parallel to the opposed upper and lower faces. References to transverse or longitudinal herein refer to directions which are respectively parallel to these transverse and longitudinal axes, unless indicated otherwise.
- the head and handle are generally made of relatively non-compressible materials, preferably with a modulus of elasticity of at least about 500 MPa, more preferably at least about 1000 MPa, which are conventional in the manufacture of toothbrushes, especially plastics materials.
- Suitable plastics materials include, for example, polyamides and polypropylenes. Polypropylene is preferred.
- Suitable polypropylenes include the material 'Polypropylene PM 1600' (marketed by Shell), having a modulus of elasticity (ISO 178) of 1500 MPa and Apryl 3400 MAI from Elf Atochem.
- a foaming agent such as Hydrocerol HP20DP from Boehringer-Mannheim is mixed with the polypropylene at a level of from about 1% to about 3%, preferably from about 1.5% to about 2.5%, by weight of the polypropylene.
- the foaming agent assists the flow of the polypropylene during moulding.
- the handle itself is generally rigid and may be of a shape which is conventional in the manufacture of toothbrushes.
- the handle may comprise a neck portion which is more flexible than the rest of the handle.
- the head comprises three or more segments, one of which may be coextensive with the handle. Preferably there are three or four segments, more preferably four. Many more than this increases the manufacturing complexity and, in a toothbrush where bristle tufts are inserted only into the head segments, makes it difficult to achieve a sufficiently high tuft density on the brush head.
- the head segments are disposed in longitudinal sequence along the head so that a longitudinal line drawn from the handle to the tip end of the head passes through the first head segment then the second head segment and so on. More especially, there is a first head segment which is connected to or continuous with the handle and two or more additional head segments arranged in longitudinal sequence towards the tip or free end of the head. In general, each head segment will be made of the same material which will preferably be the same material as the handle so that they can all be made in a single injection moulding step.
- elastomers are well known in the art of injection moulding.
- the term "elastomer” herein refers to a material which is both elastically compressible and elastically extensible.
- suitable elastomers have a modulus of elasticity of less than 500 MPa.
- Preferred elastomers for use herein have a modulus of elasticity of less than about 300 MPa, especially preferred are thermoplastic elastomers with a hardness of about 30 Shore A to 74 Shore D, polyolefin types such as styrene-ethylene-butylene-styrene (SEBS) are preferred, for example those based on Kraton® G, but other classes of elastomer, such as polyurethanes and polyamides, can also be used.
- SEBS styrene-ethylene-butylene-styrene
- An exemplary elastomer is 'PTS Thermoflex 75' (marketed by Plastic TECH Service, Germany), having a modulus of elasticity (ISO 178) of 100 MPa and a hardness (ISO 868) of 80 Shore A.
- Elastomers PL 12291, PL 12292, and PL 12293 are also suitable for use herein.
- choosing the elastomer so that is based upon the same chemical class of polymers as material of the head segments assists in fusing the elastomer to the head segments.
- the elastomer is preferably based upon a polyolefin.
- the elastomers can optionally be mixed with a suitable plasticiser or foaming agent to make them more compressible.
- the colour of the elastomer material can be the same as that of the head segments, or it may be different thereby achieving a distinctive striped or otherwise patterned appearance.
- the elastomer can be connected to the head segments and/or handle by any suitable means, such as by adhesive or by thermal fusion.
- the elastomer is preferably incorporated into the implement of the present invention by injection moulding, such that the elastomer becomes fused to the head segments and/or handle.
- Preferred injection moulding conditions and bonding strengths are described in WO 98/27846 and WO 98/27847.
- the head comprises at least one longitudinal groove which connects the transverse elastomer joints and permits the elastomer to flow from one band to the other during an injection moulding process.
- this longitudinal groove can extend along the handle so that the same elastomer injection point in the mould that is customarily used for supplying elastomer to form handle grips can also be used to inject the elastomer for the segment connecting means of the head.
- the groove will not extend through the full depth of the handle or head at all points, though it can do so where desired, for instance to provide opposed grip points on top and bottom surfaces of the handle.
- the joints between segments can be strengthened by integral hinges, preferably as described in WO 97/25900, it is preferred however that the elastomer is essentially the only means connecting the segments, by which is meant that the elastomer is the sole mechanical link between one segment and the next.
- sole mechanical link what is meant is that there are no continuous, non-elastomeric links such as bridges or springs connecting the segments.
- the elastomer may, however, have other materials dispersed within it, such as flecks of metal or pigments which might be used, for example, to provide a distinctive appearance or modify the properties of the elastomer. These additional materials will generally make a negligible contribution to the mechanical connection between the segments and/or handle such that their removal would not materially alter the strength of connection.
- the head has upper and lower faces and the elastomer joints extend transversely across the head and between the faces.
- the elastomer jointing extends essentially all the way to the lower face of the head so that preferably it is flush with the head segments. It is to be recognised however that a small, functionally inconsequential degree of shrinkage may occur.
- the elastomer In the transverse direction, though partial elastomer filling of the joints can be effected, the elastomer preferably extends the full width of the head in order to avoid exposed edges of the segments.
- the elastomer in the joint nearest the tip end of the head (the tip joint), only partially fills the joint such that there remains a groove in the upper face of the head.
- This can of course be arranged by suitable construction of the mould for the preferred injection moulding process.
- the remaining joints can be completely filled with elastomer or partially filled, provided that other grooves on the upper surface are of lesser depth than that of the tip joint, the flexibility of the tip joint being thereby increased relative to remaining joints, especially for bending of the head away from the upper face.
- the depth of groove in the tip joint is suitably from about 5 to about 20%, preferably from about 7 to about 18%, more preferably from about 10 to about 15% of the depth of the head, which is the distance between the upper and lower faces.
- the absolute depth of the groove is generally in the range from about 0.3 to about 1.5 mm, preferably from about 0.5 to about 1 mm, more especially about 0.7 mm.
- the head comprises three segments, of which one is integrally connected to the handle, there being two joints, the joint nearest the handle being wholly filled with elastomer.
- the head comprises four segments, of which one is integrally connected to the handle.
- the elastomer can wholly fill the first and second joints, preferably there are grooves in the upper surface of the head at the second and tip joints, the groove of the tip joint being deeper than that of the second joint.
- a suitable groove depth for the second joint is from about 3 to about 12%, preferably from about 5 to about 10%, more preferably from about 6 to about 9% of the depth of the head.
- the absolute depth of the groove in the second joint is generally in the range from about 0.2 to about 1 mm, preferably from about 0.3 to about 0.6 mm, more especially about 0.4 mm, for a typical toothbrush head.
- the elastomer joints can vary in thickness, either from one band to the next or even across the width or along the depth of the band.
- their thickness, measured along the longitudinal axis is in the range from about 0.1 mm to about 10 mm, preferably from about 0.3 mm to about 5 mm, more preferably from about 0.5 mm to about 3 mm.
- the bands of elastomer can be linear or non-linear. Preferably they are non-linear and take the form of chevrons or waves whose apices point towards the free end of the head.
- the upper face of the head has a concave profile along the longitudinal axis of the head, though the radius of curvature may vary along the length of the head.
- the radius of curvature is preferably from 10 to 500 mm, more preferably from 15 to 250 mm, especially from 25 to 150 mm.
- Fig. 1 is a longitudinal, vertical cross-section through the centre of the head of a toothbrush according to the invention; bristles are omitted for the sake of clarity.
- Fig. 2 is a plan view of the lower face of the head of a toothbrush according to the invention.
- a toothbrush head 1 has an upper face 2 and lower face 3 which are substantially parallel to each other and about 5 mm apart.
- the head has a handle end 4 and tip end 5, the handle end being integrally formed with an elongated polypropylene handle 6.
- the head comprises four longitudinally spaced, polypropylene segments 7, the first of which is continuous with handle 6.
- the segments are connected only by bands of a SEBS elastomer 8, having a hardness of 60 Shore A, which extend transversely across the head and between the upper face 2 and lower face 3.
- a longitudinal groove 9 extends along the bottom face of the head and the handle, connecting the bands of elastomer so that they can all be formed from a single elastomer injection point.
- the bands of elastomer are of generally uniform thickness along the longitudinal direction but broaden forwards and outwards at the lower face to provide improved keying of the elastomer to the polypropylene segments.
- the upper face of the head includes tuft holes 10 which for tufting with bristles.
- the brush head has bristles extending from each of the four segments.
- Upper face 2 is slightly concave along the longitudinal axis, having a radius of curvature of about 145 mm.
- the bands of elastomer 8 form the joints between segments 7 allowing them to articulate relative to each other, affording sufficient flexibility to the brush head that it can bend along the longitudinal axis until the top face becomes convex. In doing so the elastomer is stretched along the top face.
- the elastomer on this face can stretch to more than 200% of its unstressed length without any observable loss of attachment of the elastomer to the segments.
- the head is able to repeatedly flex to this extent and back to the rest state through 75,000 cycles, without any detachment of the elastomer from the head segments.
- the joint between the third and tip segments is not completely filled with elastomer, such that there is a groove 11 which has a depth of about 0.7 mm, in order to improve the flexibility of the joint.
- the toothbrush is made by sequential injection moulding of first the polypropylene to form the handle 6 and segments 7 and then in a second step the elastomer is injected at a temperature of 255°C, thereby becoming fused to the polypropylene. After the brush has cooled the bristle tufts are inserted by the stapling technique into pre-formed tuft holes 10.
Landscapes
- Brushes (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9815643.3A GB9815643D0 (en) | 1998-07-17 | 1998-07-17 | A grooming implement |
GB9815643 | 1998-07-17 | ||
PCT/US1999/016098 WO2000003619A1 (en) | 1998-07-17 | 1999-07-16 | A grooming implement |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1098579A1 true EP1098579A1 (en) | 2001-05-16 |
Family
ID=10835745
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99935619A Ceased EP1098579A1 (en) | 1998-07-17 | 1999-07-16 | A grooming implement |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1098579A1 (ja) |
JP (1) | JP2002520107A (ja) |
AU (1) | AU5106199A (ja) |
CA (1) | CA2337166A1 (ja) |
GB (1) | GB9815643D0 (ja) |
WO (1) | WO2000003619A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7143462B2 (en) | 2002-09-20 | 2006-12-05 | Colgate-Palmolive Company | Oral care implement |
MX2009008164A (es) | 2007-02-02 | 2009-08-25 | Gillette Co | Implementos de higiene bucal que tienen elementos flexibles y metodos para fabricarlos. |
AU2010366255B2 (en) | 2010-12-21 | 2015-04-09 | Colgate-Palmolive Company | Oral care implement |
AU2012396865B2 (en) | 2012-12-10 | 2015-11-19 | Colgate-Palmolive Company | Oral care implement |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2106991C (en) | 1991-03-27 | 2000-10-17 | Hans Halm | Toothbrush having a flexibly linked zone in its head |
GB9106511D0 (en) | 1991-03-27 | 1991-05-15 | Lingner & Fischer Gmbh | Novel article |
GB9517450D0 (en) | 1995-08-25 | 1995-10-25 | Lingner & Fischer Gmbh | Toothbrush |
GB9414140D0 (en) | 1994-07-13 | 1994-08-31 | Procter & Gamble | Toothbrush |
GB9524580D0 (en) | 1995-12-01 | 1996-01-31 | Unilever Plc | A toothbrush with flexibly mounted bristles |
TW384214B (en) * | 1995-12-29 | 2000-03-11 | Colgate Palmolive Co | Contouring toothbrush head |
GB9601013D0 (en) | 1996-01-18 | 1996-03-20 | Procter & Gamble | Brush invention |
GB9601012D0 (en) | 1996-01-18 | 1996-03-20 | Procter & Gamble | A toothbrush |
GB9616323D0 (en) * | 1996-08-02 | 1996-09-11 | Procter & Gamble | A toothbrush |
ES2327984T3 (es) * | 1997-02-24 | 2009-11-05 | Smithkline Beecham Consumer Healthcare Gmbh | Cepillo de dientes. |
-
1998
- 1998-07-17 GB GBGB9815643.3A patent/GB9815643D0/en not_active Ceased
-
1999
- 1999-07-16 AU AU51061/99A patent/AU5106199A/en not_active Abandoned
- 1999-07-16 EP EP99935619A patent/EP1098579A1/en not_active Ceased
- 1999-07-16 JP JP2000559760A patent/JP2002520107A/ja not_active Withdrawn
- 1999-07-16 CA CA002337166A patent/CA2337166A1/en not_active Abandoned
- 1999-07-16 WO PCT/US1999/016098 patent/WO2000003619A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0003619A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2002520107A (ja) | 2002-07-09 |
CA2337166A1 (en) | 2000-01-27 |
GB9815643D0 (en) | 1998-09-16 |
WO2000003619A1 (en) | 2000-01-27 |
AU5106199A (en) | 2000-02-07 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20010115 |
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AK | Designated contracting states |
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AX | Request for extension of the european patent |
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GRAG | Despatch of communication of intention to grant |
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17Q | First examination report despatched |
Effective date: 20020418 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
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18R | Application refused |
Effective date: 20021014 |