CA2189530C - Toothbrushes - Google Patents

Toothbrushes Download PDF

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Publication number
CA2189530C
CA2189530C CA002189530A CA2189530A CA2189530C CA 2189530 C CA2189530 C CA 2189530C CA 002189530 A CA002189530 A CA 002189530A CA 2189530 A CA2189530 A CA 2189530A CA 2189530 C CA2189530 C CA 2189530C
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CA
Canada
Prior art keywords
bristle
bristle tuft
toothbrush according
arrays
handle
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.)
Expired - Fee Related
Application number
CA002189530A
Other languages
French (fr)
Other versions
CA2189530A1 (en
Inventor
Amir Porat
Adam Waks
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2189530A1 publication Critical patent/CA2189530A1/en
Application granted granted Critical
Publication of CA2189530C publication Critical patent/CA2189530C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A46BRUSHWARE
    • A46BBRUSHES
    • A46B7/00Bristle carriers arranged in the brush body
    • A46B7/06Bristle carriers arranged in the brush body movably during use, i.e. the normal brushing action causing movement
    • AHUMAN NECESSITIES
    • A46BRUSHWARE
    • A46BBRUSHES
    • A46B2200/00Brushes characterized by their functions, uses or applications
    • A46B2200/10For human or animal care
    • A46B2200/1066Toothbrush for cleaning the teeth or dentures

Abstract

A toothbrush comprising an elongated handle (2), a bristle support member (9) articulately mounted on one end of the handle so as to be constrained, in use, into limited reciprocal movement with respect to the handle (2) and in a direction of longitudinal axis of the handle. The toothbrush (1) further comprising a plurality of bristle tuft arrays (24) pivotally mounted on the support member (9) about at least one pivotal axis substantially parallel to the longitudinal axis and articulately coupled to the one end of the handle (2) so that the limited reciprocal movement of the support member (9) gives rise to limited pivotal lateral rocking of the bristle arrays (24).

Description

~~~9~3~
V
TOOTHBRUSHES
FIELD OF THE INVENTION
The present invention relates to toothbrushes.
BACKGROUND OF THE INVENTION
It has long been realized that correct teeth brushing plays a great role in ensuring the health of the teeth and hums.
It is now general)v recommended that brushing be performed with up and down strokes which ensures maximal penetration of the bristles between the teeth thereby ensuring efficient removal of plaque from the teeth's surface and food remains from in between teeth and from the function of the teeth and the gums, thereby minimizing dental diseases, e.g.
tooth decay or gum inflammations.
However, this recommended practice is somewhat awkward and does not conform with a normal tendency to carry out brushing in a direction essentially parallel with that of a standard toothbrush's longitudinal axis, e.g. across the teeth's surface.
Heretofore various proposals have been made and in some cases put into practice for obtaining efficient and correct teeth brushing. Among SUBSTITUTE SHEET (RULE 26) WO 95/31123 ~ ~- PCT/US95105929 21 ~9 X30 these are a variety of brushes cquippee~ with electric motors which vive rise to reciprocal angular displacement of the entire head of a toothbrush with w respect to its longitudinal axis. However, these are somev;chat cumbersome devices and relatively e;tpensive and have not been generally accepted by the public.
Various proposals for manually operated toothbrushes have also been made, among which is the disclosure of U.S. Patent No. 4,?69,035 (Bradley), according to which the head portion of a toothbrush incorporates two pairs of elongated bristle carrying pads with the pad of each pair positioned side-bv-side and the pairs end-to-end. Each such pad is hinged to the head portion of the toothbrush with a hinge axis being angularly disposed with respect to the elongated axis of the brush. The hinge is made of a resilient material, permitting tilting of the bristle-holding pads along said an'ular disposed a;tis, whereba~, an up-down stroking action is obtained 1~ in concert with a side-to-side stroke alonj the teeth.
French Patent No. ?,616,306 (Bois) discloses a toothbrush having at its head portion an S-shaped recess pivotally accommodating two crescent-shaped bristle-holding pads, adapted for an'ular reciprocation within said recess and in the plane of the brush's head, whereby, only a planar motion of the moving bristles is obtained.
However, a disadvantage of the hitherto proposed toothbrushes is that the moving bristle pads reciprocate in a direction which is not perpendicular with respect to the longitudinal axis of the brush, thus, the correct and recommended practice of teethbrushin~ is not obtained. Another disadvantage is that reciprocal movement of the reciprocating bristle pad is obtained only b;' linear reciprocation of the brush along its lon'itudinal a:cis, ..
including its integral head portion, thus, although there is some lateral displacement of the bristles, however, it occurs along the route of linear reciprocation, i.e., it is not possible to perform actual up and down brushing SUBSTITUTE SHEET (RULE 26) 9~/0~~~9 218 9 5 3 0 _1 ~ ~ ~ ~.~ : ~' ~~~
of a specific croup of teeth, as the entire brush must be continuously l.inea~ly recipr-eprat:ed.
It is an object oP tire present invention to provide a new and improved toothbrush when the above referred-to disadvantages are significantly reduced.
BRIEF SIIt-ibIARY Or TIIE IrIVEN'fION
Accord ing to the invention there is provided a toothbrush comprising an elongated handle; a bristle support member articulately inOt111t~Ct on one end of said Handle so as to be constrained, in ase, into li.mi.ted reciprocal movement with respect to the handle and in a direction of longitudinal axis of the handle; at least one bristle tuft array fixedly mounted on said support member; a plurality of bristle tuft arrays pivotally mounted on said support member about at least one pivotal axis substantially parallel to said lonc~itud.inal axis and articulately coupled to said one end of said handle so that said limited reciprocal movement of said support member gives rise to limited pivotal lateral rockinc~.of said bristle arrays.
The fixed bristles are slightly more rigid and they extend slicJhtl.y beyond the tips of said pivotally mounted bristles.
Preferably, ttie Fixed bristle tuft arrays and the pivotal bristle tuft arrays alternate with each other, and the pivotally mounted arrays are articulately coupled to said one end of said handle by means of a cam and cam follower arrangement.
In accordance with one embodiment or Lne invention, said one end of said handle of formed on a top surface thereof with at least one cam groove and said bristle support member comp rises adjacent at least one of its longitudinal side edges at least one roc)cinc3 bar bearing said bristle tuft rnA~NDED SHEEN

WO 95131123 ~ PCT/US95105929 a downward projecting follower pin adapted for en~avement with said cam groove. It should be appreciated thst said at least one cam groove may be of any desired shape.
According to a preferred configuration of this embodiment the .
toothbrush comprises two central rows of fixedly mounted bristle tufts and one row of bristle tufts on each of said rocking bars, and said pivotally mounted bristle tuft arrays are substantially as long as said fiaedl~~ mounted arrays of bristle tufts.
In accordance with a second embodiment of the invention said one end of said handle is formed on a its top surface adjacent its lon~itudi-nal edges with upright cam members, where the elevated cam portions on one side alternate with the elevated cam members on the other side; each of said pivotally mounted arrays is mounted on a rocker member formed with a bottom surface constructed of two inclined follower surfaces adapted for 1~ sliding engagement with said upright cam members; the arrangement being such that when one of said inclined follower surfaces engage an upright cam member, the other inclined follower surface becomes flush or indented with respect to a bottom surface of said bristle support member.
' According to a preferred configuration of this embodiment said pivotally mounted bristle tuft arrays have a width substantially equal with that of said fixedly mounted bristle tuft arrays and said reciprocal movement of said support member is limited by a downward projecting stud slidingly engaging a groove parallel with said lon'itudinal axis; the groove having a len'th corresponding to a stroke of said support member.
BRIEF DESCRIPTION OF THE DRAWINGS ' For a better understanding, the invention will now be described, .
by way of example only, with reference to the accompanying drawings, in which:
SUBSTITUTE SHEET (RULE 26) WO 95/31123 218 9 5 3 0 pCT~S95/05929 _ j _ Figs. la and lb are isometric views, partially cut-out of a toothbrush according to one embodiment of the invention, the pivotal arrays shown in their angularly disposed and in their joint positions, respectively;
Fig. 2 is a perspective exploded view showing in detail the constituent elements of the toothbrush of Fibs. la and lb;
Figs. 3a and 3b are isometric views, partially cut-out of a toothbrush according to another embodiment of the invention in first and second an~~ularly disposed positions. respectively; and ' Fig. -I is a perspective, expluclecl view shu4v111~; the constituent elements of the toothbrush of F'i~s. 3a and 3b.
DETAILED DESCRIPTIO\ OF PREFERRED EiVIBODIII~IE~'TS
Reference is first being made to Figs. la, lb and ? of the drawings in which a first embodiment of a toothbrush according to the present invention consists of an elongated handle generally designated 1 having a longitudinal axis X and having a handle portion 2 and an integral flat head portion 3. The head portion 3 has a plurality of drainin~
apertures 4 and two grooves G sloping towards said longitudinal axis X.
A box-like bristle support member 9 has a bottom face 11 with a plurality of holes 12, two side walls 13, two end walls 1=I and 1~
extending lower than the side walls 13. Each wall 1=I is further provided with a rectangular opening LG. A top cover 18 (of the box-like member 9) has mounted thereon a fixed arrav of bristles 20 which in the particular embodiment consists of two ro«~s of bristle tufts 20 mounted on a central stem 21. The latter has a thickness and width such that it defines together with the inner faces of the side ails 13 and the top edge of the end wall 14 a pair of elongated sockets 19. The top cover 18 furthermore has pined 'adjacent its longitudinal edges, two elongate slots 22.
SUBSTITUTE SHEET (RULE 26) Two rocking bars 23 have each mounted thereon a row of bristle tufts 2~ and are provided with an axial hin';e 26 at each end and a downward projecting stud 28 suitable for sliding engagements with Grooves 6 of the head portion 3. The studs 2S and the grooves G together ,. , constitute a cam and cam follower arrangement.
As seen in Fibs. 1 a and lb the rocking bars 23 are pivotally mounted within the bristle support member S v~ith their axial hinges ?G
received within the sockets 19. The rocking barn 23 are pivotal in an axis substantially parallel to the lonV=itudinal axis X of the toothbrush.
As eau be seen in the ~Irawings, the: rectangular opening 1G has a width suitable for sliding=ls- accommoclating the head portion 3 of the handle 1 with the studs 2S en~;agin~ in the grooves G and in this way the bristle support member 9 is articulately mounted on the handle 1 so as to be capable of limited reciprocating motion along the longitudinal axis 1 with 1~ respect, the reciprocating stroke being limited by the extent of the grooves G.
In operation, the user gently presses the fixed bristles 20 against his teeth and reciprocates the handle 1 along its longitudinal axis Y. As a result of the friction between the fixed bristles 20 and the teeth, the bristle support member reciprocates along the handle and the rocking bars 23 are constrained to rock about their longitudinal axis, parallel to the longitudinal axis Y, resulting in up and down strokes of the pivotable tuft arrays. If, however, the user reciprocates the handle 1 with strokes longer than the length of grooves G, then the bristle support member S will reciprocate along width handle 1, with the rocking bars 23 still constrained to rock as explained above.
As can be seen from Fij. lb, in order to improve functional ;, contact of the fixed bristle tufts 19 with the teeth, these bristles are made sli?htly longer and more rigid than those of the pivotal arrays.
SUBSTITUTE SHEET (RULE 26) WO 95/31123 2 ~ ~ ° 5 3 0 PCT~S95/05929 It was found that a height difference L between the fixed and pivotal bristles ranging between 0.~ to ? mm, together with a tilting an?le a (see Fig. la) in the range of -~' to +?0°, have obtained best results.
The draining apertures -I together with the holes 12 serve for rinsing toothpaste etc., so as to prevent accumulation thereof in the grooves 6 and between the bristle support member S and the head portion 3, in order to prevent Iammmg.
Reference is now made to Figs. 3a, 3b and ~ of the drawings in which a second embodiment of the present invention is illustrated. In this embodiment and similar to the first embodiment an clon~~ate handle generally designated :~0 has an elon~,ated longitudinal axis and a handle portion 41 and a head portion 42.
As seen in Fig. 4, the head portion ~12 has pined on a top surface thereof a plurality of upright cam members 43' and :13" flush with the side walls of the head portion ~2. The arrangement is such that the elevated cam members on one side alternate with the elevated cam members on the other side. First cam members :13' located opposite the spaces between second cam members 43" have each two camped gliding surfaces ~-~ whereas the second members ~3" each have only one camped gliding surface =t6. The head portion ~2 further comprises a plurality of draining apertures ~7 and a .groove 43 parallel with the longitudinal axis 1.
A bristle support member 49 has an essentially U-shaped cross-section having two side walls ~0 and a top surface 51 on which are mounted four fixed bristle tuft arravs 52 fixed on bridging members 53 with 2~ spacing 5~ therebetween. Each bridging member 53 has on a side facing a neighboring bridging member, a recess SG.
Each spacing 5~ is adapted for receiving a rocking member 57 on which is mounted on a top surface thereof a bristle tuft array 58. The rocking member ~7 has a triangular shaped base 59, the two inclined SUBSTITUTE SHEET (RULE 26) WO 95131123 21 ~ 9 5 3 0 PCT/US95/05929 surfaces thereof serving as cam followers which together with cams ~3' and 43" constitute a cam and cam follower arrangement. Each rockin~
member 57 further comprises two alijned, lateral projecting hinges Gl, adapted for pivotal mounting within said spacin vs 5~, with the hinges Gl , resting within the recess ~6.
At the rear edge of the bristle support member :19 there is a downward projecting stud G? adapted for reciprocating within ~~roovc ~S of the head portion ~3, serving together as a reciprocation limit. A bottom plate G3 is fixedly assembled to the bristles support mcmher -19, and has a plurality of holes G-I which together with draining holes -17 of head portion 42 serve fur rinsing,; the toothbrush from~c:~cessive toothpaste, etc.
In operation, the user gently presses the bristles against his teeth and reciprocates the handle :~1 along its longitudinal axis Z. Each time a cam surface 59 encounters a cam member :~3' or 43" it ascends over the gliding ramp 45 or ~6 respectively, and tilts over to the other side as illustrated in Figs. 3a and 3b. In this position, when the bristle support member 49 has the fixed bristle tufts 58 in functional contact with the teeth wherein the bottom plate G3 contacts the inner cheek, the bristle support member 49 may remain static but the pivotal bristle tuft arrays 58 will rock up and down. However, if the user reciprocates the handle ~1 with strokes longer than the length of groove 48, then, the bristle support member 49 will reciprocate along with the handle 41, with the rocking members 57 continuing to rock as explained above.
Also according to this embodiment, in order to improve contact of the fixed arrays of bristle tufts 52 with the teeth, these bristles are made slightly longer and more rigid than the pivotal array of bristle tufts 58 as seen in Fig. 3a.
According to a preferred modification of this embodiment, the length of groove :~8 is such that each axial stroke causes each rocking SUBSTITUTE SHEET (RULE 26) _ c) _ member ~7 to rock only once at each stroke. However, if the distance between adjacent cam members -1;~' and -13" decreases, thus, each rocking member 57 will rock more than unc~ at each stroke.
It was found that for this particular embodiment, a height difference L between the fired and bristles ranging between 0.~ and ? mm, and a tilting anUle ~3 (see Fig. 3b) in the range of ~° to '_'0°, have obtained best results.
The number and order of the fired and pivotal bristle tuft arrays may vary as desired. Furthermore, the tilting angle and the height difference L may be of climrnsiuw other than those specified. Additionally, the fixed and pivotal bristle arrays of the toothbrush may each be of different ri~idit~~.
SUBSTITUTE SHEET (RULE 26)

Claims (17)

CLAIMS:
1. A toothbrush comprising an elongated handle; a bristle support member articulately mounted on one end of said handle so as to be constrained, in use, into a limited reciprocal movement with respect to the handle and in a direction of a longitudinal axis of the handle; at least one bristle tuft array fixedly mounted on said bristle support member; a plurality of bristle tuft arrays pivotally mounted on said bristle support member about at least one pivotal axis substantially parallel to said longitudinal axis and articulately coupled to said one end of said handle so that said limited reciprocal movement of said bristle support member gives rise to limited pivotal lateral rocking of said pivotally mounted bristle tuft arrays.
2. A toothbrush according to claim 1, wherein the constituent bristles of said fixedly mounted bristle tuft array extend slightly beyond the tips of said pivotally mounted bristle tuft arrays.
3. A toothbrush according to claim 1, wherein the constituent bristles of sand fixedly mounted bristle tuft array are slightly more rigid than those of the pivotally mounted bristle tuft arrays.
4. A toothbrush according to claim 1, wherein said fixedly mounted bristle tuft arrays and said pivotal bristle tuft arrays alternate with each other.
5. A toothbrush according to claim 1, wherein said pivotally mounted bristle tuft arrays are articulately coupled to said one end of said handle by means of a cam and cam follower assembly.
6. A toothbrush according to claim 1, wherein said one end of said dandle and said bristle a support member comprise apertures for use in rinsing.
7. A toothbrush according to claim 1, wherein said one end of said handle is formed on a top surface thereof with at least one cam groove and said bristle support member comprises adjacent at least one of its longitudinal side edges at least one rocking bar bearing said bristle tuft array and being pivotally mounted thereon; said rocking bar being provided with a downward projecting follower pin adapted for engagement with said cam groove.
8. A toothbrush according to claim 7, wherein said at least one cam groove slopes toward said longitudinal axis.
9. A toothbrush according to claim 7, wherein said at least one cam groove is arced or undulating along an axis parallel to said longitudinal axis.
10. A toothbrush according to claim 7, comprising adjacent each of its longitudinal side edges two or mare consecutive rocking bars having a common axis parallel with said longitudinal axis.
11. A toothbrush according to claim 7, comprising two central rows of fixedly mounted bristle tufts and one row of bristle tufts on each of said rocking bars.
12. A toothbrush according to claim 7, wherein said pivotally mounted bristle tuft arrays are substantially as long as said fixedly mounted bristle tuft arrays.
13. A toothbrush according to claim 1, wherein said one end of said handle is formed on a top surface thereof adjacent longitudinal edges thereof with upright cam members, wherein the upright cam members on one side alternate with the upright cam members on the other side; each of said pivotally mounted bristle tuft arrays is mounted on a rocker member formed with a bottom surface constructed of two symmetrically inclined follower surfaces adapted for sliding engagement with said upright cam members; the arrangement being such that when one of said inclined follower surfaces is engaged with an upright cam member, the other inclined follower surface is flush or indented with respect to a bottom surface of said bristle support member.
14. A toothbrush according to claim 13, wherein said pivotally mounted bristle tuft arrays have a width substantially equal to that of said fixedly mounted bristle tuft arrays.
15. A toothbrush according to claim 13, where said reciprocal movement of said bristle support member is limited by a downward projecting stud slidingly engaging a groove parallel to said longitudinal axis; the groove having a length corresponding to a stroke of said bristle support member.
16. A toothbrush according to claim 13, comprising three pivotal bristle tuft arrays and four fixed bristle tuft arrays alternating with one another.
17. A toothbrush according to claim 13, comprising four pivotal bristle tuft arrays and three fixed bristle tuft arrays.
CA002189530A 1994-05-11 1995-05-11 Toothbrushes Expired - Fee Related CA2189530C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IL109622A IL109622A (en) 1994-05-11 1994-05-11 Toothbrushes
IL109622 1994-05-11
PCT/US1995/005929 WO1995031123A1 (en) 1994-05-11 1995-05-11 Toothbrushes

Publications (2)

Publication Number Publication Date
CA2189530A1 CA2189530A1 (en) 1995-11-23
CA2189530C true CA2189530C (en) 2000-03-28

Family

ID=11066124

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002189530A Expired - Fee Related CA2189530C (en) 1994-05-11 1995-05-11 Toothbrushes

Country Status (11)

Country Link
US (1) US5528786A (en)
EP (1) EP0758857B1 (en)
JP (1) JPH11503623A (en)
AU (1) AU695024B2 (en)
BR (1) BR9507862A (en)
CA (1) CA2189530C (en)
DE (1) DE69511398T2 (en)
ES (1) ES2135739T3 (en)
IL (1) IL109622A (en)
RU (1) RU2130748C1 (en)
WO (1) WO1995031123A1 (en)

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Also Published As

Publication number Publication date
US5528786A (en) 1996-06-25
IL109622A (en) 1998-06-15
ES2135739T3 (en) 1999-11-01
JPH11503623A (en) 1999-03-30
IL109622A0 (en) 1994-08-26
WO1995031123A1 (en) 1995-11-23
DE69511398T2 (en) 2000-02-10
AU2636795A (en) 1995-12-05
EP0758857B1 (en) 1999-08-11
AU695024B2 (en) 1998-08-06
RU2130748C1 (en) 1999-05-27
BR9507862A (en) 1997-09-16
EP0758857A1 (en) 1997-02-26
DE69511398D1 (en) 1999-09-16
CA2189530A1 (en) 1995-11-23

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