EP2448446B1 - Toothbrush having improved tuft retention and anchor wire - Google Patents

Toothbrush having improved tuft retention and anchor wire Download PDF

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Publication number
EP2448446B1
EP2448446B1 EP09790029.4A EP09790029A EP2448446B1 EP 2448446 B1 EP2448446 B1 EP 2448446B1 EP 09790029 A EP09790029 A EP 09790029A EP 2448446 B1 EP2448446 B1 EP 2448446B1
Authority
EP
European Patent Office
Prior art keywords
staple
grooves
major surface
toothbrush
acute angle
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.)
Not-in-force
Application number
EP09790029.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2448446A1 (en
Inventor
Francis P. Paciullo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Colgate Palmolive Co
Original Assignee
Colgate Palmolive Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Colgate Palmolive Co filed Critical Colgate Palmolive Co
Publication of EP2448446A1 publication Critical patent/EP2448446A1/en
Application granted granted Critical
Publication of EP2448446B1 publication Critical patent/EP2448446B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • A46B9/04—Arranged like in or for toothbrushes
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B3/00—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier
    • A46B3/16—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier by wires or other anchoring means, specially for U-shaped bristle tufts
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/10—For human or animal care
    • A46B2200/1066—Toothbrush for cleaning the teeth or dentures

Definitions

  • the present invention relates generally to brushes, especially toothbrushes, and specifically to an improved anchor or staple design for securing tufts of bristles within the head of the brush.
  • the brushes are injection molded with empty tuft holes in the toothbrush head.
  • the tuft holes may also be drilled after the injection molding as well as initially formed in the head concurrently with the injection molding.
  • U shaped tufts of bristles are inserted into the holes in the head.
  • Each tuft of bristles is held in place by a plate-like staple that is wider than the tuft hole so that when the staple is used to drive the U-shaped bristle tufts into the tuft hole, the edges of the staple slightly cut and deform the sides of the hole.
  • the pressure and resulting static friction of the surrounding plastic on the staple contributes to forces maintaining the staple in place.
  • there are certain problems associated with brushes made in this manner are certain problems associated with brushes made in this manner.
  • toothbrush staples of the rectangular type have become available in which at least one of the major surfaces thereof is provided with parallel horizontal grooves (i.e., grooves that extend parallel with a longitudinal axis of the staple), thereby yielding a staple that has been found to be more resistant to becoming separated from its tuft hole than staples with smooth surfaces.
  • Staples have also been developed having a rounded edges that eliminate and/or minimize the problem of tuft weakening and possible rupture of filaments or bristles at the bight of the U.
  • the zone or area of contact between the lower staple edge and the bristle filament closely matches the U shape at the bight portion of each tuft. In turn, this permits the staples to be driven deeper into the head and thus a larger and more consistent force can be applied to each U shaped tuft without cutting or damaging the filaments.
  • oligodynamic staples constructed of materials having oligodynamic action have also been disclosed in the art. These oligodynamic staples have smooth major surfaces and are constructed of a material having oligodynamic action, such as cadmium, silver, brass, copper, stainless steel, titanium and mercury.
  • toothbrush staples are constructed of a nickel-silver alloy. Due to the costs associated with the nickel-silver alloy, it has long been desired to create staples from cheaper metals, such as brass. While the general concept of using a brass staple has been disclosed, testing and experimentation have proven that merely creating and using a flat-faced brass staple cannot be used in the manufacture of toothbrushes to provide effective tuft retention. Moreover, merely applying known groove patterns has also proven to be ineffective.
  • JP2004-081286 discloses a toothbrush comprising flat wires used to hold respective tufts of bristles within holes in a head of the toothbrush.
  • Each flat wire has a plurality of slots formed in a surface thereof, each slot following a linear axis that is aligned at an angle of between 30 and 150 degrees to a surface of the head.
  • the present invention provides a staple having an optimized pattern of grooves in at least one of its major surfaces.
  • the optimized groove pattern makes it possible to create the staples out of a material that is more cost effective than a nickel-silver alloy, such as brass, while still providing the necessary tuft retention so as to be utilized in a viable toothbrush product.
  • a first aspect of the invention provides a staple for securing cleaning elements within an ansate implement, the staple being as defined in claim 1.
  • the acute angle is between 40 and 70 degrees, more preferably between 55 and 65 degrees, and most preferably approximately 60 degrees.
  • a second aspect of the present invention provides an ansate implement comprising the staple of the first aspect of the present invention, the ansate implement being as defined in claim 14.
  • the ansate implement may be a toothbrush wherein the at least one cleaning element comprises at least one tuft of bristles.
  • the staple 100 is a flattened piece of wire that is used as an anchor in a brush, particularly a toothbrush, to secure U shaped tufts of bristles within tuft holes created in the head of an ansate implement, such as a toothbrush.
  • the staple 100 has a substantially rectangular cross-section (both longitudinal and transverse) and is elongated along the longitudinal axis A-A. Of course, other shapes can be utilized in creating the staple.
  • the staple 100 is delimited by a perimeter comprising a top edge 10 , a bottom edge 11 , a first lateral edge 12 and a second lateral edge 13 .
  • the staple 100 has a length L , a height H and a thickness t .
  • the length L of the staple 100 will depend on the size of the tuft hole in which it is to be inserted, but is in a preferred range of 2.09 to 2.13 millimeters, and most preferably about 2.11 millimeters for a 1.70 mm tuft hole.
  • the height H of the staple 100 will also depend on the dimensions of its end use, but is in a preferred range of 1.49 to 1.51 millimeters, and most preferably about 1.50 millimeters for a 1.70 mm tuft hole.
  • the thickness t of the staple 100 will also depend on its end use, but is in a preferred range of 0.24 to 0.26 millimeters, and most preferably about 0.25 millimeters. The invention, however, is not so limited in all embodiments and other dimensions may be utilized. The exact dimensions in any final product will be dictated by the size of the tuft hole, the type and size of the bristle tufts, the type of brush in which the staples are used, etc. Furthermore, while the staple 100 is illustrated as having an overall uniform thickness t , height H and length L , one or more of these dimensions may be tapered and/or irregular.
  • edges 10-13 of the staple 100 are substantially flat.
  • one or more of the edges 10-13 may be shaped to provide additional tuft retention and/or decrease pressure at the bight of the bristle tuft.
  • the lateral edges 12-13 may be serrated, sharpened or barbed while the bottom edge 11 may be rounded.
  • the staple 100 further comprises a first major surface 20 and a second major surface 21 .
  • the second major surface 21 is opposite the first major surface 20 so that the staple 100 is a flat rectangular plate-like structure.
  • the first major surface 20 includes a first set of grooves 30 formed into and covering the substantial entirety of the first major surface 20 . All of the grooves 30 are arranged so as to be substantially parallel to one another and equidistantly spaced apart from one another. In certain embodiments, however, all of the grooves 30 may not be substantially parallel to one another and the distance between adjacent grooves may vary either irregularly or as a function of distance from one or both of the lateral edges 12-13 .
  • this ridge 31 is an elongated strip and is not segmented.
  • the first major surface 20 contain no grooves that intersect with one another. Stated simply, the groove pattern on the first major surface 20 is preferably free of any intersecting grooves.
  • the grooves 30 are linear in shape for the illustrated preferred embodiment, each extending along a groove axis B-B .
  • the grooves 30 are preferably spaced apart from one another by a distance D of 0.29 to 0.31 millimeters, and most preferably about 0.30 millimeters.
  • the grooves 30 preferably have a width W of 0.09 to 0.11 millimeters, and most preferably about 0.10 millimeters. In one embodiment, it is preferred that the ratio of the distance D to width W be in a range of 3.0 to 4.0, and most preferably be 3.0.
  • the grooves 30 have a depth of 0.09 to 0.11 millimeters, and most preferably about 0.11 millimeters. The exact dimensions of the grooves and their pattern, however, can vary greatly and are not to be considered limiting of the present invention unless specifically recited in the claims.
  • the depth of the grooves 30 is preferably no greater than one-third of the thickness t of the staple 100 . It has been discovered that making the grooves 30 having a depth greater than one-third of the thickness t results in undesired distortion of the wire/staple 100 .
  • the grooves 30 extend the entire height H of the staple 100 , extending from the bottom edge 11 to the top edge 10 .
  • the grooves 30 are oriented on the first major surface 20 of the staple 100 so as to be slanted with respect to the longitudinal axis A-A .
  • the groove axis B-B of each of the grooves 30 forms a non-normal angle with the longitudinal axis A-A of the staple 100 .
  • the groove axis B-B of the grooves 30 intersect the longitudinal axis A-A at an acute angle ⁇ that is specially selected to provide adequate tuft retention and retain structural integrity of the staple 100 when inserted in the toothbrush.
  • the acute angle ⁇ plays a determining role in achieving the desired goal of increased tuft retention, depending also on the metal of construction.
  • the angle of the groove pattern has also been discovered to allow cheaper and/or softer metals to be used without resulting in unwanted deformation and/or curling of the wire.
  • the metal selected should not be so soft that the imprinting of the groove patters causes unwanted deformation and curling.
  • Aluminum has been discovered to be unsuitable in most cases.
  • a metal is selected for the staple 100 that has a Brinell hardness less than that of nickel-silver and greater than aluminum.
  • the acute angle ⁇ needs to be 40 to 70 degrees, more preferably 55 and 65 degrees, and most preferably about 60 degrees.
  • the wire has a tendency to deform and coil.
  • the angle is greater than 70 degrees for brass, it is difficult to imprint the angled groove pattern.
  • experiments using destructive testing of toothbrushes has shown that, when compared to other grooved or non-grooved anchors, tuft retention has surprisingly increased up to 25%.
  • the grooves 30 are oriented on the first major surface 20 as slanting upward from the bottom edge 11 to the top edge 10 going from the first lateral edge 12 to the second lateral edge 13 .
  • the grooves 30 can be arranged to slant upward in the opposite direction if desired, i.e., from the bottom edge 11 to the top edge 10 going from the second lateral edge 13 to the first lateral edge 12 .
  • the second major surface 21 of the staple 100 is preferably a smooth surface that is substantially free of grooves or other topography. In other embodiments (as will be discussed below with respect to FIGS. 7-9 ), the second major surface 21 may also be patterned with grooves.
  • the grooves 30 can be formed by roll pressing or stamping a sheet of brass with a die and then cutting the sheet into the desired strips, which are then cut to form the staples 100 .
  • each of the bristle tufts 50 are anchored in the tuft holes 215 by one of the staples 100 . While bristle tufts 50 are illustrated, other cleaning elements could be used, including elastomeric fingers, fibers, etc.
  • the toothbrush 200 comprises a head 210 and a neck portion 220 that extends into an elongated handle. A plurality of tuft holes 215 are formed into the front surface 211 of the head 210 .
  • the head 210 is typically constructed of a hard plastic, such as polypropylene.
  • Each of the plurality of tuft holes 215 in the toothbrush head 210 extend downwardly from the front surface 211 of the head 210 along a central axis C-C .
  • the tuft holes 215 are preferably circular bores formed into the head 210 .
  • the tuft holes 215 can be formed to be in other shapes if desired.
  • the bristle tufts 50 are bent in a U shape and secured in the tuft holes 215 by the staples 100 .
  • the staples 100 are driven into the tuft holes 215 so that each bristle tuft 50 bends in the U shape and comprises a bight portion 51 and two extending legs 52, 53 .
  • the legs 52, 53 of the bristle tufts 50 extend upward and out of the holes 215 and above the front surface 211 of the head 210 .
  • the bight or curved part 51 of the bristle tuft 50 is contacted by the bottom edge 11 of staple 100 while the two legs 52, 53 extend upwardly and define the visible bristles of the toothbrush.
  • each staple 10 The two lateral edges 12-13 of each staple 10 are seen to extend slightly into opposite sidewalls of each hole 215 .
  • the rotational orientation of the plane which contains each staple 100 is not critical, i.e., the staple 100 may be installed by rotating it, before installation, about its central vertical axis differently from the rotational orientation of about 45 degrees to assume any desired orientation. It is preferred, however, that the staples 100 be positioned in the tuft holes 215 so that the longitudinal axis A-A of the staples 100 are substantially normal to the central axis C-C of the tuft holes 215 .
  • a staple 100A is illustrated according to a second embodiment of the invention.
  • the basic structure of the staple 100A is identical to that of staple 100 . Therefore, like numbers have been used to identify corresponding components and features with the addition of suffix "A.” In order to avoid redundancy, only those features of staple 100A that are different than the staple 100 will be discussed below with the understanding that the aforementioned discussion is applicable.
  • the major difference between staple 100A and staple 100 is that the second major surface 21A of the staple 100A comprises a second set of grooves 40A in addition to the first set of grooves 30A formed into the first major surface 20A .
  • the discussion above with respect to the grooves 30 of staple 100 is generally applicable to both grooves 30A and grooves 40A , and is hereby incorporated by reference. It should be noted, however, that in this embodiment of the invention, the acute angle is from 40 to 70 degrees.
  • the grooves 30A formed into the first surface 20A of the staple 100A are oriented so as to as slant upward from the bottom edge 10A to the top edge 11A going from the first lateral edge 12 to the second lateral edge 13 .
  • the grooves 40A formed into the second surface 21A of the staple 100A are oriented on the second major surface 21A so as to slant upward from the bottom edge 11A to the top edge 10A going from the second lateral edge 13 to the first lateral edge 12 .
  • the grooves 30A and the grooves 40A extend in opposing slanted directions.
  • the orientation of the slants of the grooves 30A and the grooves 40A could be alternated.
  • the grooves 30A and grooves 40A are arranged so that their openings along the top and bottom edges 10A, 11A alternate along the length of the staple 100A .
  • Toothbrush 1 An experiment was conducted on three different types of commercially available toothbrushes to determine and compare the tuft retention for typical Ag-Ni staples having longitudinal grooves (i.e., 0 degrees) and brass staples having grooves angled at 60 degrees according to the present invention.
  • the three different toothbrushes tested are referred to herein as Toothbrush 1, Toothbrush 2, and Toothbrush 3.
  • test data for Toothbrush 1 will be discussed.
  • the details of the test parameters and tuft retention data for Toothbrush 1 using Ag-Ni staples having longitudinal grooves as the anchors is set forth in the table of Figure 10A and the graph of Figure 10B .
  • the details of the test parameters and tuft retention data for Toothbrush 1 using brass staples having grooves angled at 60 degrees as the anchors is set forth in the table of Figure 11A and the graph of Figure 11B .
  • the longitudinally grooved Ag-Ni staples resulted in an Average Tuft Retention of 3.7 kgf and a CPK of 1.5.
  • the brass staples having grooves angled at 60 degrees resulted in an Average Tuft Retention of 3.7 kgf and a greater CPK of 1.82.
  • test data for Toothbrush 2 will be discussed.
  • the details of the test parameters and tuft retention data for Toothbrush 2 using Ag-Ni staples having longitudinal grooves as the anchors is set forth in the table of Figure 12A and the graph of Figure 12B .
  • the details of the test parameters and tuft retention data for Toothbrush 2 using brass staples having grooves angled at 60 degrees as the anchors is set forth in the table of Figure 13A and the graph of Figure 13B .
  • the longitudinally grooved Ag-Ni staples resulted in an Average Tuft Retention of 3.8 kgf and a CPK of 2.24.
  • the brass staples having grooves angled at 60 degrees resulted in an improved Average Tuft Retention of 4.0 kgf and a greater CPK of 2.48.
  • test data for Toothbrush 3 will be discussed.
  • the details of the test parameters and tuft retention data for Toothbrush 3 using Ag-Ni staples having longitudinal grooves as the anchors is set forth in the table of Figure 14A and the graph of Figure 14B .
  • the details of the test parameters and tuft retention data for Toothbrush 3 using brass staples having grooves angled at 60 degrees as the anchors is set forth in the table of Figure 15A and the graph of Figure 15B .
  • the longitudinally grooved Ag-Ni staples resulted in an Average Tuft Retention of 2.4 kgf and a CPK of 0.63.
  • the brass staples having grooves angled at 60 degrees resulted in an improved Average Tuft Retention of 2.8 kgf and a greater CPK of 1.09.

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  • Brushes (AREA)
EP09790029.4A 2009-07-01 2009-07-01 Toothbrush having improved tuft retention and anchor wire Not-in-force EP2448446B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2009/049432 WO2011002460A1 (en) 2009-07-01 2009-07-01 Toothbrush having improved tuft retention and anchor wire

Publications (2)

Publication Number Publication Date
EP2448446A1 EP2448446A1 (en) 2012-05-09
EP2448446B1 true EP2448446B1 (en) 2016-01-27

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ID=42041528

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09790029.4A Not-in-force EP2448446B1 (en) 2009-07-01 2009-07-01 Toothbrush having improved tuft retention and anchor wire

Country Status (9)

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EP (1) EP2448446B1 (es)
KR (1) KR101402438B1 (es)
CN (1) CN102469871B (es)
AU (1) AU2009348907B2 (es)
CA (1) CA2764966C (es)
MX (1) MX2011012446A (es)
PH (1) PH12013502553A1 (es)
RU (1) RU2472404C1 (es)
WO (1) WO2011002460A1 (es)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9119462B2 (en) 2011-07-23 2015-09-01 Braun Gmbh Oral cleaning implement having a plastic staple comprising a cavity
EP3381319A1 (en) * 2017-03-31 2018-10-03 The Gillette Company LLC Head for an oral care implement, oral care implement and method for manufacturing such head
EP3381320A1 (en) * 2017-03-31 2018-10-03 The Gillette Company LLC Head for an oral care implement, oral implement and method for manufacturing such head
EP3381321A1 (en) * 2017-03-31 2018-10-03 The Gillette Company LLC Head for an oral care implement, oral care implement and method for manufacturing such head
JP2018183275A (ja) * 2017-04-24 2018-11-22 ライオン株式会社 歯ブラシ
DE102019121693A1 (de) * 2019-08-12 2021-02-18 Berkenhoff Gmbh Bürste mit mittels Klammern befestigten Borstenbüschel sowie Draht zur Herstellung derartiger Klammern
CN218605529U (zh) * 2019-11-04 2023-03-14 高露洁-棕榄公司 口腔护理器具

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2176465T3 (es) * 1995-06-12 2002-12-01 Moll Ind Inc Cepillo con retencion mejorada de los mechones e hilo de anclaje para los mismos.
US5850660A (en) * 1996-01-25 1998-12-22 Radius Inc. Toothbrush with hexagonal bristles in hexagonal tuft holes
US6352313B1 (en) * 1999-08-25 2002-03-05 Gillette Canada Company' Brush tufting
JP2004081286A (ja) 2002-08-23 2004-03-18 Lion Corp 歯ブラシ
CN2933129Y (zh) * 2006-08-02 2007-08-15 张诗年 新型牙刷扁丝片

Also Published As

Publication number Publication date
CA2764966A1 (en) 2011-01-06
CN102469871B (zh) 2016-01-20
RU2472404C1 (ru) 2013-01-20
KR20120031094A (ko) 2012-03-29
CN102469871A (zh) 2012-05-23
AU2009348907A1 (en) 2011-12-08
MX2011012446A (es) 2011-12-16
WO2011002460A1 (en) 2011-01-06
PH12013502553B1 (en) 2015-04-13
CA2764966C (en) 2014-09-30
EP2448446A1 (en) 2012-05-09
PH12013502553A1 (en) 2015-04-13
KR101402438B1 (ko) 2014-06-03
AU2009348907B2 (en) 2013-05-16

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