EP1538947A1 - Toothbrush with leaf spring for ensuring correct pressure - Google Patents

Toothbrush with leaf spring for ensuring correct pressure

Info

Publication number
EP1538947A1
EP1538947A1 EP03771505A EP03771505A EP1538947A1 EP 1538947 A1 EP1538947 A1 EP 1538947A1 EP 03771505 A EP03771505 A EP 03771505A EP 03771505 A EP03771505 A EP 03771505A EP 1538947 A1 EP1538947 A1 EP 1538947A1
Authority
EP
European Patent Office
Prior art keywords
toothbrush
handle
spring device
disclosed
neck
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.)
Withdrawn
Application number
EP03771505A
Other languages
German (de)
French (fr)
Inventor
Bard Andresen
Anne Elisabeth Dreher
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.)
Jordan AS
Original Assignee
Jordan AS
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
Priority claimed from NO20023574A external-priority patent/NO20023574D0/en
Application filed by Jordan AS filed Critical Jordan AS
Publication of EP1538947A1 publication Critical patent/EP1538947A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B15/00—Other brushes; Brushes with additional arrangements
    • A46B15/0002—Arrangements for enhancing monitoring or controlling the brushing process
    • A46B15/0004—Arrangements for enhancing monitoring or controlling the brushing process with a controlling means
    • A46B15/0012—Arrangements for enhancing monitoring or controlling the brushing process with a controlling means with a pressure controlling device
    • 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
    • A46B5/0054—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions designed to allow relative positioning of the head to body
    • A46B5/0062—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions designed to allow relative positioning of the head to body being flexible or resilient during use
    • 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
    • A46B5/0054—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions designed to allow relative positioning of the head to body
    • A46B5/0062—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions designed to allow relative positioning of the head to body being flexible or resilient during use
    • A46B5/007—Inserts made of different material, e.g. springs, plates
    • 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

  • Toothbrush with leaf spring for ensuring correct pressure Toothbrush with leaf spring for ensuring correct pressure.
  • the present invention relates to a toothbrush that is designed to suddenly cause a reduction of the brush contact pressure of the brush head on a tooth and/or gum surface when the toothbrush user applies excessive brushing force.
  • toothbrushes with a flexible neck, where the bristled head and the neck of the toothbrush are flexed backwards in relation to the handle according to the brushing pressure.
  • a disadvantage of such toothbrushes is that it is not easy for the user to know when he or she is brushing too hard. See for instance EP371293 and FR2053885.
  • EP371293 and EP281017 describe toothbrushes with spring devices in the neck.
  • the object of the present invention is to provide a toothbrush that makes the user aware of when he or she is brushing too hard and at the same time prevents excessively hard brushing.
  • the toothbrush should basically not be significantly larger than today's standard toothbrushes.
  • a toothbrush that is designed to cause flexing of the brush head when the brush contact pressure exceeds a specified brush contact pressure on a tooth and/or gum surface when the ** ⁇ - ibrush user applies excessive brushing force to the toothbrush, and wherein the fi ⁇ g is effected by a spring device, wherein the toothbrush is made of a first rigid plastic material, and wherein the toothbrush is characterised in that the spring device is located in the toothbrush handle; and - that the spring device consists of at least one metal spring leaf having a curved cross-section. The spring device causes a sudden reduction of the brush contact pressure of the brush head on a tooth and/or gum surface.
  • the spring device consists of two or more spring leaf lamellas.
  • the curve of the spring leaf or leaves means that it/they are subjected to tensile and compressive forces when the brush is loaded. When the maximum moment that the curvature of the spring leaf or leaves is/are capable of withstanding is exceeded, it or they will yield to the forces and collapse so that the curvature is straightened out. When the brush is relieved of pressure, the spring stiffness will cause the spring leaf or leaves returri to a curved shape and the brush return to its original shape.
  • Figure 1 is a view of one embodiment of the toothbrush according to the invention
  • Figure 2 shows the toothbrush from Figure 1 which has just been subjected to excessive brushing force
  • Figure 3 is a cross-sectional view of the brush in Figure 1 taken along the line A- A;
  • Figure 4a shows an "open" part of a second embodiment of the toothbrush according to the invention:
  • Figure 4b shows an enlarged section of Figure 4a;
  • Figure 5 shows an embodiment with an extended outermost lamella
  • Figure 6a shows a two-piece embodiment of the toothbrush according to the invention
  • Figure 6b shows another embodiment of a two-piece toothbrush according to the invention
  • Figure 7 is a graph showing the relation between force of deflection and deflec ⁇ 'on for a toothbrush according to the invention
  • Figure 8a shows an unloaded curved spring leaf
  • Figure 8b shows a curved spring leaf that has been subjected to an excessive load.
  • Figure 1 shows one possible embodiment of a toothbrush 1 according to the invention having a head 2, a neck 3 and a handle 4. Bristles 7 are arranged on the head 2.
  • the spring device 5 is located in the handle 4 close to the neck 3.
  • the handle 4 and the neck 3 are made of a rigid first plastic material, whilst the spring device 5 is encased by an elastically yielding second plastic material 6.
  • the spring device consists of two parallel spring leaf lamellas 5', 5".
  • the spring device in this case is encased by the elastic second plastic material 6.
  • the spring device may consist of several parallel spring leaves depending on the magnitude of the brush contact pressure that is to cause the toothbrush head 2 and neck 3 to flex suddenly relative to the handle 4.
  • Figure 2 shows the toothbrush from Figure 1 after it has just been used with excessive brushing force.
  • the force on the brush has released the spring device 5, so that the head 2 and neck 3 have been moved backwards, whereby the brush pressure is reduced, in that angle between the handle and the neck suddenly becomes larger.
  • the spring device 5 will then ensure that the head and neck are moved back to the original position as shown in Figure 1 when the user ceases to exert excessive pressure.
  • the sudden change in the form of the toothbrush will be noticeable to the user as the angle of action for the user's hand relative to the surface he or she wishes to brush will be wrong.
  • the spring device 5 is located in the handle 4 close to the area between the neck 3 and the handle 4. During use the toothbrush user will often place a thumb in this area. The location of the spring device 5 in the handle means that the buckle the toothbrush is given when the user brushes too hard will be outside the user's mouth. Furthermore, if the spring device 5 is encased in an elastic second plastic material, this material will not have to be introduced into the mouth, which is agreeable for the user.
  • Figures 4a and 4b illustrate possible ways of fastening one or more spring leaf plates 5 to each other and to the handle 4 and to the intermediate section leading to the neck 3 on the toothbrush 1.
  • the neck 3 is connected to the spring device 5 via notches 11 in the spring device 5.
  • the handle 4 is fastened to the spring device in that the rigid first plastic material is passed through a hole 10 in the spring device 5.
  • the spring device can of course be fastened in the same way, either via a hole or notches in the plate, to both the handle 4 and the neck 3.
  • the spring device can also be secured in other ways than those shown here,
  • the second plastic material is transparent and an outermost one of the lamellas is provided with markings and/or decoration, not shown in the drawings.
  • the outermost lamella 5'" can extend past the other lamella or lamellas towards the free end of the handle, as shown in Fig. 5.
  • the handle is split into a short separate end portion 4' to which the neck 3 is fastened and the rest of the handle 4".
  • the spring device 5 has a portion that projects from the short end portion adapted for releasable engagement with a suitably arranged portion on the remaining part of the handle 4".
  • a connecting collar 14 of the second plastic material there may be provided, as shown, a connecting collar 14 of the second plastic material. The collar may be located on the separate end 4' and/or on the remaining part of the handle 4".
  • Figure 6b shows a second embodiment of a two-piece toothbrush.
  • the spring device 5 is arranged in the rest of the handle 4" and this handle part is adapted for releasable engagement vith the short end portion 4' and the neck 3.
  • Figure 7 is a graph showing the relation between deflection and force of deflection for a toothbrush according to the invention.
  • the graph shows clearly how an excessive force triggers a sudden reduction in the force of deflection continues.
  • deflection in this context means the flexing of the toothbrush head 2 and neck 3 relative to the handle 4 when a compressive force is applied to the bristles 7.
  • Figures 8a and 8b show how a curved spring leaf in unloaded state (Figure 8a) when subjected to an excessive load (Figure 8b) is given a "break" so that the curve is straightened out. When the load is reduced, the spring leaf will return to its original form ( Figure 8a).
  • the toothbrush according to the invention could be made in the form of either a manual toothbrush or an electromechanically operated toothbrush.

Landscapes

  • Brushes (AREA)

Abstract

A toothbrush (1) is described which is designed to suddenly cause a reduction of the brush contact pressure of the brush head (2) on a tooth and/or gum surface when the toothbrush user applies excessive force to the toothbrush, and wherein the pressure reduction is effected b a spring device (5) having a curved cross-section, and wherein the toothbrush is made of a first, rigid plastic material and optionally a second, elastically yielding plastic material.

Description

Toothbrush with leaf spring for ensuring correct pressure.
The present invention relates to a toothbrush that is designed to suddenly cause a reduction of the brush contact pressure of the brush head on a tooth and/or gum surface when the toothbrush user applies excessive brushing force.
When teeth are brushed, it is important that the toothbrush is not pressed too hard against the teeth and gums thereby damaging them.
There are already known toothbrushes with a flexible neck, where the bristled head and the neck of the toothbrush are flexed backwards in relation to the handle according to the brushing pressure. A disadvantage of such toothbrushes is that it is not easy for the user to know when he or she is brushing too hard. See for instance EP371293 and FR2053885.
Furthermore, EP371293 and EP281017 describe toothbrushes with spring devices in the neck.
For a toothbrush to be practically useful, it must be comfortable for the user to use and must not have a larger head and neck than can be moved around comfortably inside the mouth.
The object of the present invention is to provide a toothbrush that makes the user aware of when he or she is brushing too hard and at the same time prevents excessively hard brushing. In addition, the toothbrush should basically not be significantly larger than today's standard toothbrushes.
This is achieved with a toothbrush that is designed to cause flexing of the brush head when the brush contact pressure exceeds a specified brush contact pressure on a tooth and/or gum surface when the ** <- ibrush user applies excessive brushing force to the toothbrush, and wherein the fi ιg is effected by a spring device, wherein the toothbrush is made of a first rigid plastic material, and wherein the toothbrush is characterised in that the spring device is located in the toothbrush handle; and - that the spring device consists of at least one metal spring leaf having a curved cross-section. The spring device causes a sudden reduction of the brush contact pressure of the brush head on a tooth and/or gum surface.
h a second embodiment, the spring device consists of two or more spring leaf lamellas.
Other features and embodiments of the invention are disclosed in the other, dependent claims.
It is the curved shape of the spring device that helps to give the toothbrush the desired function. The curve of the spring leaf or leaves means that it/they are subjected to tensile and compressive forces when the brush is loaded. When the maximum moment that the curvature of the spring leaf or leaves is/are capable of withstanding is exceeded, it or they will yield to the forces and collapse so that the curvature is straightened out. When the brush is relieved of pressure, the spring stiffness will cause the spring leaf or leaves returri to a curved shape and the brush return to its original shape.
The invention will be explained in more detail with reference to the attached drawings, wherein,
Figure 1 is a view of one embodiment of the toothbrush according to the invention; Figure 2 shows the toothbrush from Figure 1 which has just been subjected to excessive brushing force;
Figure 3 is a cross-sectional view of the brush in Figure 1 taken along the line A- A;
Figure 4a shows an "open" part of a second embodiment of the toothbrush according to the invention: Figure 4b shows an enlarged section of Figure 4a;
Figure 5 shows an embodiment with an extended outermost lamella; and
Figure 6a shows a two-piece embodiment of the toothbrush according to the invention;
Figure 6b shows another embodiment of a two-piece toothbrush according to the invention; Figure 7 is a graph showing the relation between force of deflection and deflec^'on for a toothbrush according to the invention;
Figure 8a shows an unloaded curved spring leaf;
Figure 8b shows a curved spring leaf that has been subjected to an excessive load.
It will be appreciated that the drawings merely illustrate typical exemplary embodiments and should not be regarded as defining the limits of the invention. Figure 1 shows one possible embodiment of a toothbrush 1 according to the invention having a head 2, a neck 3 and a handle 4. Bristles 7 are arranged on the head 2. The spring device 5 is located in the handle 4 close to the neck 3. The handle 4 and the neck 3 are made of a rigid first plastic material, whilst the spring device 5 is encased by an elastically yielding second plastic material 6. In the embodiment shown in Fig. 3, the spring device consists of two parallel spring leaf lamellas 5', 5". The spring device in this case is encased by the elastic second plastic material 6. The spring device may consist of several parallel spring leaves depending on the magnitude of the brush contact pressure that is to cause the toothbrush head 2 and neck 3 to flex suddenly relative to the handle 4.
Figure 2 shows the toothbrush from Figure 1 after it has just been used with excessive brushing force. The force on the brush has released the spring device 5, so that the head 2 and neck 3 have been moved backwards, whereby the brush pressure is reduced, in that angle between the handle and the neck suddenly becomes larger. The spring device 5 will then ensure that the head and neck are moved back to the original position as shown in Figure 1 when the user ceases to exert excessive pressure. The sudden change in the form of the toothbrush will be noticeable to the user as the angle of action for the user's hand relative to the surface he or she wishes to brush will be wrong.
As can be seen from Figures 1 and 2, the spring device 5 is located in the handle 4 close to the area between the neck 3 and the handle 4. During use the toothbrush user will often place a thumb in this area. The location of the spring device 5 in the handle means that the buckle the toothbrush is given when the user brushes too hard will be outside the user's mouth. Furthermore, if the spring device 5 is encased in an elastic second plastic material, this material will not have to be introduced into the mouth, which is agreeable for the user.
Figures 4a and 4b illustrate possible ways of fastening one or more spring leaf plates 5 to each other and to the handle 4 and to the intermediate section leading to the neck 3 on the toothbrush 1. In this case, the neck 3 is connected to the spring device 5 via notches 11 in the spring device 5. The handle 4 is fastened to the spring device in that the rigid first plastic material is passed through a hole 10 in the spring device 5. It will be understood that the spring device can of course be fastened in the same way, either via a hole or notches in the plate, to both the handle 4 and the neck 3. The spring device can also be secured in other ways than those shown here, In one embodiment of the invention the second plastic material is transparent and an outermost one of the lamellas is provided with markings and/or decoration, not shown in the drawings. In addition, the outermost lamella 5'" can extend past the other lamella or lamellas towards the free end of the handle, as shown in Fig. 5.
In a two-piece version of the toothbrush that is shown in Figure 6a, the handle is split into a short separate end portion 4' to which the neck 3 is fastened and the rest of the handle 4". The spring device 5 has a portion that projects from the short end portion adapted for releasable engagement with a suitably arranged portion on the remaining part of the handle 4". In one possible embodiment, there may be provided, as shown, a connecting collar 14 of the second plastic material. The collar may be located on the separate end 4' and/or on the remaining part of the handle 4". Figure 6b shows a second embodiment of a two-piece toothbrush. In this embodiment the spring device 5 is arranged in the rest of the handle 4" and this handle part is adapted for releasable engagement vith the short end portion 4' and the neck 3.
Figure 7 is a graph showing the relation between deflection and force of deflection for a toothbrush according to the invention. The graph shows clearly how an excessive force triggers a sudden reduction in the force of deflection continues. The term "deflection" in this context means the flexing of the toothbrush head 2 and neck 3 relative to the handle 4 when a compressive force is applied to the bristles 7.
Figures 8a and 8b show how a curved spring leaf in unloaded state (Figure 8a) when subjected to an excessive load (Figure 8b) is given a "break" so that the curve is straightened out. When the load is reduced, the spring leaf will return to its original form (Figure 8a).
The toothbrush according to the invention could be made in the form of either a manual toothbrush or an electromechanically operated toothbrush.

Claims

P a t e n t c l a i m s
1.
A toothbrush (1) that is designed to cause flexing of the brush head (2) when the brush contact pressure exceeds a certain brush contact pressure on a tooth and/or gum surface when the toothbrush user applies excessive brushing force to the toothbrush, and wherein deflection is effected by a spring device (5), wherein the toothbrush is made of a first rigid plastic material, characterised in - that the spring device (5) is located in the toothbrush handle (4); and that the spring device (5) consists of at least one metal spring leaf having a curved cross-section.
2. A toothbrush- as disclosed in claim 1, characterised in that the spring device (5) suddenly causes a reduction of the brush contact pressure of the brush head (2) on a tooth and/or gum surface.
3. A toothbrush as disclosed in claim 1 or 2, characterised in that the spring device (5) is located close to an intermediate area between the toothbrush handle (4) and neck (3).
4.
A toothbrush as disclosed in one or more of claims 1-3, characterised in that the spring device (5) has a buckle point located in the toothbrush handle (4) close to the toothbrush neck (3) .
5.
A toothbrush as disclosed in one or more of claims 1-4, characterised in that the spring device (5) consists of two or more spring leaf lamellas.
6.
A toothbrush as disclosed in one or more of claims 1-5, characterised in that it comprises a second, elastically yielding material (6) and the spring device (5) is at least partly encased by the second material (6).
7.
A toothbrush as disclosed in claim 5, characterised in that the lamellas of the spring device are mechanically joined together at at least one point.
8.
A toothbrush as disclosed in claim 3, characterised in that the mechanical joining is effected by the first material which extends through hole (10) or notch (11) in the plates.
9.
A toothbrush as disclosed in one or more of claims 5-8, characterised in that the second material (6) is transparent; and that an outermost one of the lamellas is provided with markings and/or decoration.
10.
A toothbrush as disclosed in claim 9, characterised in that a decorated part of said lamella extends in the longitudinal direction past the other lamella or lamellas in the direction of the free end of the handle.
11.
A toothbrush as disclosed in one or more of claims 1-9, characterised in that the toothbrush consists of two detachable parts formed of respectively the toothbrush handle (4") and a separate short portion (4') of the handle to which the toothbrush neck (3) and head portion (2) are fixed; and that said spring device (5) has a portion that projects from the short end portion (4') of the handle or the rest of the handle (4") and is designed to be inserted into a suitable second end area on the rest of the handle (4") or a suitable end area on the short end portion (4') of the handle and to form releasable engagement therewith.
12.
A toothbrush as disclosed in claim 11, characterised in - that said end area of the handle and/or the end of the rest of the handle is provided with a connecting collar (14) of said second material.
EP03771505A 2002-07-26 2003-07-08 Toothbrush with leaf spring for ensuring correct pressure Withdrawn EP1538947A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
NO20023574A NO20023574D0 (en) 2002-07-26 2002-07-26 Toothbrush
NO20023574 2002-07-26
NO20032637A NO322158B1 (en) 2002-07-26 2003-06-11 Toothbrush
NO20032637 2003-06-11
PCT/NO2003/000242 WO2004010822A1 (en) 2002-07-26 2003-07-08 Toothbrush with leaf spring for ensuring correct pressure

Publications (1)

Publication Number Publication Date
EP1538947A1 true EP1538947A1 (en) 2005-06-15

Family

ID=27615821

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03771505A Withdrawn EP1538947A1 (en) 2002-07-26 2003-07-08 Toothbrush with leaf spring for ensuring correct pressure

Country Status (6)

Country Link
EP (1) EP1538947A1 (en)
CN (1) CN1684606A (en)
AU (1) AU2003256168A1 (en)
NO (1) NO322158B1 (en)
PL (1) PL373136A1 (en)
WO (1) WO2004010822A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006026165B4 (en) * 2006-06-06 2014-10-23 Frauke Denniger toothbrush
EP2361528A1 (en) 2010-02-26 2011-08-31 Trisa Holding AG Oral hygiene device, in particular toothbrush, and method for its production
CN102949001A (en) * 2011-08-26 2013-03-06 丁松俊 Toothbrush capable of automatically controlling tooth brushing pressure
JPWO2015137487A1 (en) * 2014-03-14 2017-04-06 ライオン株式会社 Toothbrush handle body, toothbrush, and method for manufacturing toothbrush handle body
KR20170140248A (en) * 2015-04-02 2017-12-20 테-쿵 리 Constant load brush
CN110269388B (en) * 2016-08-30 2022-03-08 北京易得道科技有限公司 Toothbrush system scoring monitoring method

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Publication number Priority date Publication date Assignee Title
DE3612108A1 (en) * 1986-04-10 1987-10-15 Rainer Dr Seib Toothbrush with an elastic connecting element between the brush head and handle
ATE80982T1 (en) * 1987-02-27 1992-10-15 Blendax Werke Schneider Co TOOTHBRUSH.
DE3840136C1 (en) * 1988-11-29 1990-05-17 Blendax Gmbh, 6500 Mainz, De
US5315732A (en) * 1993-05-20 1994-05-31 Huefner Norman F Toothbrush having adjustable brushing pressure
DE9310112U1 (en) * 1993-07-07 1994-06-09 Hoffmann, Kay, Dr., 53639 Königswinter toothbrush
BE1007374A3 (en) * 1993-07-30 1995-05-30 Philips Electronics Nv Toothbrush.
DE19533144C2 (en) * 1995-09-08 1999-09-16 Coronet Werke Gmbh toothbrush
US5694658A (en) * 1996-03-04 1997-12-09 Natural Sparkle Im/Ex Co. Ltd. Flexible toothbrush
DE19752553A1 (en) * 1997-11-27 1999-06-02 Achim Dr Med Garnjost Toothbrush with controlled pressure

Non-Patent Citations (1)

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Title
See references of WO2004010822A1 *

Also Published As

Publication number Publication date
PL373136A1 (en) 2005-08-22
AU2003256168A1 (en) 2004-02-16
NO322158B1 (en) 2006-08-21
WO2004010822A1 (en) 2004-02-05
NO20032637D0 (en) 2003-06-11
CN1684606A (en) 2005-10-19

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