US20060265825A1 - Electric toothbrushes - Google Patents
Electric toothbrushes Download PDFInfo
- Publication number
- US20060265825A1 US20060265825A1 US11/455,534 US45553406A US2006265825A1 US 20060265825 A1 US20060265825 A1 US 20060265825A1 US 45553406 A US45553406 A US 45553406A US 2006265825 A1 US2006265825 A1 US 2006265825A1
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- US
- United States
- Prior art keywords
- brush head
- brush
- electric toothbrush
- toothbrush according
- drive pin
- 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.)
- Abandoned
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
- A61C17/16—Power-driven cleaning or polishing devices
- A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B13/00—Brushes with driven brush bodies or carriers
- A46B13/02—Brushes with driven brush bodies or carriers power-driven carriers
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B15/00—Other brushes; Brushes with additional arrangements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
- A61C17/16—Power-driven cleaning or polishing devices
- A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
- A61C17/32—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating
- A61C17/34—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
- A61C17/16—Power-driven cleaning or polishing devices
- A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
- A61C17/32—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating
- A61C17/34—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor
- A61C17/349—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor with multiple brush bodies
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
- A61C17/16—Power-driven cleaning or polishing devices
- A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
- A61C17/32—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating
- A61C17/34—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor
- A61C17/3409—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor characterized by the movement of the brush body
- A61C17/3436—Rotation around the axis perpendicular to the plane defined by the bristle holder
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C2202/00—Packaging for dental appliances
Definitions
- This invention relates to electric toothbrushes including those powered by a rechargeable battery from a mains domestic electricity supply.
- a potential problem with this arrangement is that it is relatively complex and is not easily cleanable with running water such that the moving parts may become clogged with toothpaste or debris.
- the complexity and number of the parts used to provide the oscillating motion for the twin heads adds to the cost and complexity of manufacture.
- the present invention is derived from the realization that it would be preferable to have an electric toothbrush having multiple, such as two, rotatable brush heads but which dispenses with the need for gears or crank mechanisms for transferring oscillating rotary motion from one brush to another, typically a first brush driven by a connection to an electric motor and the second brush driven by movement of the first brush.
- an electric toothbrush having a housing containing an electric motor, the motor being drivingly connected to a first brush head rotatably mounted on an end of the toothbrush remote from the motor adjacent to at least one other rotatable brush head, wherein the first brush head includes a drive pin extending therefrom substantially at right angles from the axis of rotation, the free end of the drive pin being received within a guide slot in a brush head to be driven thereby, the arrangement being such that the drive pin bears against respectively opposite sides of the guide slot to thereby drive a driven brush head clockwise and anti-clockwise about its axis of rotation as the first brush head is also being oscillated.
- This arrangement has the advantage in that the connection between two or more brush heads is extremely simple and since there are no moving parts other than the free end of the or each drive pin as it rocks back and forth within the or a respective guide slot, such can be easily cleaned under running water.
- a further advantage is that the mechanical motion of the brush head driven by the first brush head is necessarily magnified slightly due to its displacement from the first brush head and this overcomes any backlash that may be inherent in the system.
- a preferred embodiment of the invention uses only two brush heads, one driven directly via the drive link between the electric motor and the brush itself and the other being driven by a drive pin extending from the periphery of the first brush head, nevertheless it will be apparent that the same principle can be used to drive more than a second brush head and, in turn, the second brush head may itself drive a third brush head, and so on. Additionally, one or more of the brush heads may be of different diameter to the first brush head, although it will be appreciated that where there are differences in diameter a consideration of equivalent gear ratios then becomes necessary to determine whether the difference is too great to allow for the required movement.
- the means by which the first brush head is driven back and forth about its axis may comprise a bell crank arrangement in which an elbowed end of a crankshaft, drivingly connected at its other end to the motor, is received within an elongated slot extending into the periphery of the first brush head diametrically opposite the drive pin (for a twin brush head toothbrush), the length of the slot being at least as great as the range of movement available to the elbow when the crankshaft is rotated through 360°.
- a drive pin for driving a second brush head has a still further advantage to the linkages referred to in the preamble hereto in that the second head may have a plane of rotation which is angled relative to the plane of rotation of the first brush head, such as being angled inwardly slightly, although it will be understood that there are practical limits to the amount that a second or even more such brush heads can be angled with respect to the plane of rotation of the first brush head.
- the end of the elbowed end of the crankshaft and the or each drive pin is partly spherical and takes the form of a ball joint, each being receivable within a respective slot of substantially the same diameter so as to minimize rattle and wear.
- a convenient arrangement has been found to be a ball joint made of nylon where the bristle holding part of the brush heads are made of e.g. PVC or some other suitable plastics material.
- the slot for receiving each ball joint is partly arcuate so as to maximize the surface area in contact between the ball joint to thereby decrease the load forces on the slot and therefore reduce wear.
- the toothbrush is packaged in e.g. a blister pack and includes a “try me” facility for remotely testing the operation of the toothbrush, such as by a prospective purchaser of the toothbrush, whilst the toothbrush is still in its protective sales packaging, which “try me” feature comprises a two-sided metal foil or strip (such as aluminum foil), separated by a di-electric material such as paper or plastics, respective sides of the foil or strip being connected at one end to respective conductors of an electric circuit used to operate the electric toothbrush and, in particular, to energize the electric motor thereof, the other end of the foil or strip being folded over and including a centrally disposed aperture onto or over which is disposed a bendable metal connector such that upon bending or pressing of the connector the two sides of the strip or foil are electrically connected together to temporarily operate the toothbrush whilst still in its packaging.
- “try me” feature comprises a two-sided metal foil or strip (such as aluminum foil), separated by a di-electric material such as paper or plastics, respective sides of the foil or strip being connected at one end to respective
- the “try me” feature may be permanently disconnected from the toothbrush after being purchased by simply being pulled away from the electrical connectors to which it is attached.
- FIG. 1 is a side elevation of a toothbrush according to a first embodiment of the invention having a pair of brush heads, one of which is angled inwardly slightly with respect to the other;
- FIG. 2 is an enlarged and partly cut away view of the end of the toothbrush of FIG. 1 which includes the brush heads;
- FIG. 3 is a schematic plan view showing the mode of operation of the toothbrush heads of FIG. 1 and 2 ;
- FIG. 4 is an enlarged schematic view of the brush head end of a toothbrush according to a preferred embodiment of the invention.
- FIG. 5 is a section of elevation along the line “A”-“A” of part of FIG. 5 .
- FIG. 6 is a perspective and partly cut away view of a second embodiment of the invention, which includes a “try me” feature,
- an electric toothbrush shown generally at 1 comprises a plastics body portion 2 for housing a motor, battery and associated electrical circuitry (not shown) and a detachable generally hollow brush head holder 3 including at the free end thereof a first brush head 4 and a second brush head 5 , each being partly rotatable by being drivingly connected to the motor in the housing 2 in a manner to be described.
- a push button 6 in the housing 2 is used to operate the toothbrush 1 and a “try me” feature shown generally at 7 can be used to temporarily operate the toothbrush 1 in accordance with a second embodiment of the invention in a manner to be described with reference to FIG. 6 .
- FIGS. 2 and 3 there is shown the operable end of the brush head holder 3 in which it will be seen that the first brush head 4 includes a generally disc-shaped bristle holder 8 from which extend respective sets of bristles shown generally at 9 in FIG. 2 .
- the second brush head 5 comprises a generally disc-shaped bristle holder 10 from which extend sets of bristles shown generally at 11 .
- Brush head 4 is mounted for rotation on a pivot pin 12 and brush head 5 is mounted for rotation on a pivot pin 13 , although the plane of rotation of brush head 5 is slightly offset to the plane of rotation of brush head 4 by about 5.degree. such that the bristles 11 are inclined slightly inwardly towards the bristles 9 .
- a bell crank mechanism which includes a stainless steel crankshaft 14 secured for rotation about its major axis in a journal 15 extending from a spigot 16 on the inside of the brush head holder 3 as shown more clearly in FIG. 2 .
- the end of the crankshaft adjacent thereto includes an elbow joint 17 , the free end of which extends into a slotted region 18 within the bristle holder 8 of the brush head 4 , which slotted region 18 is sufficiently long (or tall) to accommodate 360.degree.
- crankshaft 14 rotation of the crankshaft 14 and in particular movement of the elbow 17 about the major axis of the crankshaft 14 so that upon rotation thereof continuously clockwise or anti-clockwise it will be apparent that the brush head 4 will be forced to oscillate back and forth about the pivot 12 .
- Brush head 5 is driven in a different manner by means of a drive pin 19 which extends diametrically outwardly from the bristle holder 8 of the brush 4 , to which it is fixed for rotation therewith, and is received in a slotted region 20 of the bristle holder 10 of the brush head 5 .
- the slotted region 20 is wide enough to permit the drive pin 19 to move in an arc dictated by the movement of the elbow 17 within the slotted region 18 about the major axis of the crankshaft 14 but in an opposite sense so that clockwise movement of the brush head 4 causes anticlockwise movement of the brush head 5 , and vice versa.
- FIGS. 4 and 5 there is shown a preferred embodiment of the engagement between the elbowed end 17 of the crankshaft 14 with the slot 18 in the first brush head 8 and between the drive pin 19 within the slot 20 in the second brush head 10 .
- a respective part-spherical ball joint 21 , 22 made of nylon are received within the respective slots 18 , 20 , which in this instance are partly arcuate so as to maximize the surface area available for contact by the ball joints 21 , 22 .
- This has the advantage of minimizing wear and in practice it has been found that the use of nylon in the ball joints 21 , 22 gives excellent results in terms of self-lubrication properties when the brush heads 8 , 10 are made of a suitable plastics material, such as PVC.
- FIGS. 4 and 5 the locus of movement of the ball joint 21 is shown in which it will be seen that as the crankshaft 14 rotates in one direction only the ball joint 21 essentially assumes maximum upper and lower positions about the central axis of the crankshaft 14 within the slot 18 as shown in FIG. 5 and left to right positions as shown in FIG. 4 to thereby drive the bristle holder 8 back and forth about its central axis in the manner shown arrowed to, in turn, drive the second bristle holder 10 via the drive shaft 14 back and forth about its own axis, but in the opposite sense so that as one brush head moves clock wise, the other always moves anti-clockwise, and so on.
- FIG. 6 there is shown a second embodiment of the invention which includes a “try me” feature shown generally at 7 .
- This includes a twin sided metal foil strip 3 , such as a double sided aluminum strip separated by a dielectric material (not shown) such as paper or plastics, respective sides of the strip 3 being electrically connected to respective parts of a printed circuit board 24 by connectors 25 and 26 forming part of a closeable circuit for operating a motor 27 to, in turn, rotate the crankshaft 14 and hence oscillate the brush heads 4 , 5 in the manner as described with reference to FIGS. 2 and 3 .
- a twin sided metal foil strip 3 such as a double sided aluminum strip separated by a dielectric material (not shown) such as paper or plastics, respective sides of the strip 3 being electrically connected to respective parts of a printed circuit board 24 by connectors 25 and 26 forming part of a closeable circuit for operating a motor 27 to, in turn, rotate the crankshaft 14 and hence oscillate the brush heads 4 , 5 in the manner as
- the free end of the strip 23 has a folded over region in the form of a ring 28 onto which can be fitted a metal disc 29 which includes a domed central region 30 which may be pressed to temporarily connect both sides of the strip 3 to complete the circuit between the connectors 25 and 26 and thereby temporarily activate the toothbrush 1 .
- the “try me” feature 7 includes a strip 23 by which it allows a prospective purchaser of the toothbrush to determine if and how it works prior to purchase following pressing of the metal disc 29 , after purchase the “try me” feature 7 can be effectively deactivated by simply pulling the strip 23 away from the printed circuit board 24 and hence out of engagement with the connectors 25 , 26 thereon, whereafter an end cap 31 can be refitted onto the housing 2 of the toothbrush 1 in order to commence normal operation via pressing of the button 6 .
Abstract
In a first embodiment an electric toothbrush having a housing containing an electric motor, the motor being drivingly connected to a first brush head rotatably mounted on an end of the toothbrush remote from the motor and adjacent to at least one other rotatable brush head. In a second embodiment a packaged electric toothbrush including a “try me” facility for remotely testing the operation of the toothbrush, which “try me” feature comprises a two-sided metal strip such as aluminum foil, separated by a dielectric material, respective sides of the strip being connected at one end to respective parts used to operate the electric toothbrush and the other end of the strip being folded over and including a centrally disposed aperture onto which is a bendable metal connector such that upon bending or pressing of the connector the two sides of the strip are electrically connected together to temporarily operate the toothbrush whilst still in its packaging.
Description
- This application is a continuation of application Ser. No. 11/006,818, filed Dec. 8, 2004, which is a continuation of application Ser. No. 10/797,899, filed Mar. 10, 2004, which claims the benefit of application Ser. No. 09/969,632, filed Oct. 4, 2001, all of which are incorporated herein in their entirety.
- This invention relates to electric toothbrushes including those powered by a rechargeable battery from a mains domestic electricity supply.
- In U.S. Pat. No. 5,226,206, there is described an electric toothbrush having twin brush heads which are drivingly connected together by a rack and pinion assembly in which the rack is reciprocated via a drive shaft connected to a crank shaft mounted at one end for rotation on a gear driven by a motor. The twin brush heads are therefore able to oscillate about their respective axes either in the same direction or in opposite directions, depending upon the configuration of the rack, this being generally ‘U’ shaped so as to facilitate the use of gear teeth on the inside thereof for driving the respective heads via respective pinions in mesh therewith.
- A potential problem with this arrangement is that it is relatively complex and is not easily cleanable with running water such that the moving parts may become clogged with toothpaste or debris. In addition, the complexity and number of the parts used to provide the oscillating motion for the twin heads adds to the cost and complexity of manufacture.
- In U.S. Pat. No. 5,353,460 the use of a rack and pinion assembly is dispensed with in favour of a crank mechanism connecting the first brush head to the second brush head. The first brush head is directly driven by a mitre gear or crown wheel which then, in turn, drives the second brush head to oscillate in the opposite direction to that of the first brush head. This arrangement involves fewer moving parts but still depends on the presence of gears and the crank mechanism for its operation, leading to the possibility of these moving parts being difficult to clean and becoming clogged etc. In addition, because the crank arm necessarily has to connect the respective brush heads on the sides thereof remote from the bristles, it will be understood that additional space is required to provide for free movement of the crank arm when the brush is in use. This also has the disadvantage in that the working ends of the crank linkage can never be directly exposed to running water for rinsing and cleaning purposes.
- In a first aspect the present invention is derived from the realization that it would be preferable to have an electric toothbrush having multiple, such as two, rotatable brush heads but which dispenses with the need for gears or crank mechanisms for transferring oscillating rotary motion from one brush to another, typically a first brush driven by a connection to an electric motor and the second brush driven by movement of the first brush.
- According to a first aspect of the invention there is provided an electric toothbrush having a housing containing an electric motor, the motor being drivingly connected to a first brush head rotatably mounted on an end of the toothbrush remote from the motor adjacent to at least one other rotatable brush head, wherein the first brush head includes a drive pin extending therefrom substantially at right angles from the axis of rotation, the free end of the drive pin being received within a guide slot in a brush head to be driven thereby, the arrangement being such that the drive pin bears against respectively opposite sides of the guide slot to thereby drive a driven brush head clockwise and anti-clockwise about its axis of rotation as the first brush head is also being oscillated.
- This arrangement has the advantage in that the connection between two or more brush heads is extremely simple and since there are no moving parts other than the free end of the or each drive pin as it rocks back and forth within the or a respective guide slot, such can be easily cleaned under running water. A further advantage is that the mechanical motion of the brush head driven by the first brush head is necessarily magnified slightly due to its displacement from the first brush head and this overcomes any backlash that may be inherent in the system. Although a preferred embodiment of the invention uses only two brush heads, one driven directly via the drive link between the electric motor and the brush itself and the other being driven by a drive pin extending from the periphery of the first brush head, nevertheless it will be apparent that the same principle can be used to drive more than a second brush head and, in turn, the second brush head may itself drive a third brush head, and so on. Additionally, one or more of the brush heads may be of different diameter to the first brush head, although it will be appreciated that where there are differences in diameter a consideration of equivalent gear ratios then becomes necessary to determine whether the difference is too great to allow for the required movement.
- The means by which the first brush head is driven back and forth about its axis may comprise a bell crank arrangement in which an elbowed end of a crankshaft, drivingly connected at its other end to the motor, is received within an elongated slot extending into the periphery of the first brush head diametrically opposite the drive pin (for a twin brush head toothbrush), the length of the slot being at least as great as the range of movement available to the elbow when the crankshaft is rotated through 360°.
- The use of a drive pin for driving a second brush head has a still further advantage to the linkages referred to in the preamble hereto in that the second head may have a plane of rotation which is angled relative to the plane of rotation of the first brush head, such as being angled inwardly slightly, although it will be understood that there are practical limits to the amount that a second or even more such brush heads can be angled with respect to the plane of rotation of the first brush head.
- Preferably, the end of the elbowed end of the crankshaft and the or each drive pin is partly spherical and takes the form of a ball joint, each being receivable within a respective slot of substantially the same diameter so as to minimize rattle and wear. A convenient arrangement has been found to be a ball joint made of nylon where the bristle holding part of the brush heads are made of e.g. PVC or some other suitable plastics material. Preferably, the slot for receiving each ball joint is partly arcuate so as to maximize the surface area in contact between the ball joint to thereby decrease the load forces on the slot and therefore reduce wear.
- According to a second embodiment of the invention, the toothbrush is packaged in e.g. a blister pack and includes a “try me” facility for remotely testing the operation of the toothbrush, such as by a prospective purchaser of the toothbrush, whilst the toothbrush is still in its protective sales packaging, which “try me” feature comprises a two-sided metal foil or strip (such as aluminum foil), separated by a di-electric material such as paper or plastics, respective sides of the foil or strip being connected at one end to respective conductors of an electric circuit used to operate the electric toothbrush and, in particular, to energize the electric motor thereof, the other end of the foil or strip being folded over and including a centrally disposed aperture onto or over which is disposed a bendable metal connector such that upon bending or pressing of the connector the two sides of the strip or foil are electrically connected together to temporarily operate the toothbrush whilst still in its packaging.
- Preferably, the “try me” feature may be permanently disconnected from the toothbrush after being purchased by simply being pulled away from the electrical connectors to which it is attached.
- The invention will now be described, by way of example only, with reference to the accompanying drawings in which:
-
FIG. 1 is a side elevation of a toothbrush according to a first embodiment of the invention having a pair of brush heads, one of which is angled inwardly slightly with respect to the other; -
FIG. 2 is an enlarged and partly cut away view of the end of the toothbrush ofFIG. 1 which includes the brush heads; -
FIG. 3 is a schematic plan view showing the mode of operation of the toothbrush heads ofFIG. 1 and 2; -
FIG. 4 is an enlarged schematic view of the brush head end of a toothbrush according to a preferred embodiment of the invention, and, -
FIG. 5 is a section of elevation along the line “A”-“A” of part ofFIG. 5 . -
FIG. 6 is a perspective and partly cut away view of a second embodiment of the invention, which includes a “try me” feature, - Referring firstly to
FIG. 1 , an electric toothbrush shown generally at 1 comprises aplastics body portion 2 for housing a motor, battery and associated electrical circuitry (not shown) and a detachable generally hollowbrush head holder 3 including at the free end thereof afirst brush head 4 and asecond brush head 5, each being partly rotatable by being drivingly connected to the motor in thehousing 2 in a manner to be described. Apush button 6 in thehousing 2 is used to operate thetoothbrush 1 and a “try me” feature shown generally at 7 can be used to temporarily operate thetoothbrush 1 in accordance with a second embodiment of the invention in a manner to be described with reference toFIG. 6 . - In
FIGS. 2 and 3 there is shown the operable end of thebrush head holder 3 in which it will be seen that thefirst brush head 4 includes a generally disc-shaped bristle holder 8 from which extend respective sets of bristles shown generally at 9 inFIG. 2 . similarly, thesecond brush head 5 comprises a generally disc-shaped bristle holder 10 from which extend sets of bristles shown generally at 11.Brush head 4 is mounted for rotation on apivot pin 12 andbrush head 5 is mounted for rotation on a pivot pin 13, although the plane of rotation ofbrush head 5 is slightly offset to the plane of rotation ofbrush head 4 by about 5.degree. such that the bristles 11 are inclined slightly inwardly towards thebristles 9. This has been found to be advantageous in that thebrush heads - Reciprocating clockwise and anti-clockwise rotation of the
first brush head 4 is facilitated by means of a bell crank mechanism which includes astainless steel crankshaft 14 secured for rotation about its major axis in a journal 15 extending from aspigot 16 on the inside of thebrush head holder 3 as shown more clearly inFIG. 2 . The end of the crankshaft adjacent thereto includes an elbow joint 17, the free end of which extends into aslotted region 18 within the bristle holder 8 of thebrush head 4, which slottedregion 18 is sufficiently long (or tall) to accommodate 360.degree. rotation of thecrankshaft 14 and in particular movement of the elbow 17 about the major axis of thecrankshaft 14 so that upon rotation thereof continuously clockwise or anti-clockwise it will be apparent that thebrush head 4 will be forced to oscillate back and forth about thepivot 12. -
Brush head 5 is driven in a different manner by means of adrive pin 19 which extends diametrically outwardly from the bristle holder 8 of thebrush 4, to which it is fixed for rotation therewith, and is received in aslotted region 20 of thebristle holder 10 of thebrush head 5. In this case, theslotted region 20 is wide enough to permit thedrive pin 19 to move in an arc dictated by the movement of the elbow 17 within theslotted region 18 about the major axis of thecrankshaft 14 but in an opposite sense so that clockwise movement of thebrush head 4 causes anticlockwise movement of thebrush head 5, and vice versa. - As will be understood by those skilled in the art, the absence of any gears in this part of the
electric toothbrush 1 enables it to be easily cleaned in running water and because there arc few moving parts as compared to toothbrushes which include gears or crank arms for driving the or each brush head it will be appreciated that manufacture of the toothbrush according to the first embodiment of the invention can be easily facilitated. - In
FIGS. 4 and 5 there is shown a preferred embodiment of the engagement between the elbowed end 17 of thecrankshaft 14 with theslot 18 in the first brush head 8 and between thedrive pin 19 within theslot 20 in thesecond brush head 10. In each case a respective part-spherical ball joint respective slots ball joints ball joints brush heads 8,10 are made of a suitable plastics material, such as PVC. As well, it will be apparent that during use of the toothbrush, saliva and indeed debris from foodstuffs being cleaned will also assist in lubricating the moving parts, whereafter they may be cleaned in running water with little risk of particles of debris adhering to the generally smoothly profiled surfaces in this region of the toothbrush. - In
FIGS. 4 and 5 the locus of movement of theball joint 21 is shown in which it will be seen that as thecrankshaft 14 rotates in one direction only theball joint 21 essentially assumes maximum upper and lower positions about the central axis of thecrankshaft 14 within theslot 18 as shown inFIG. 5 and left to right positions as shown inFIG. 4 to thereby drive the bristle holder 8 back and forth about its central axis in the manner shown arrowed to, in turn, drive thesecond bristle holder 10 via thedrive shaft 14 back and forth about its own axis, but in the opposite sense so that as one brush head moves clock wise, the other always moves anti-clockwise, and so on. - In
FIG. 6 there is shown a second embodiment of the invention which includes a “try me” feature shown generally at 7. This includes a twin sidedmetal foil strip 3, such as a double sided aluminum strip separated by a dielectric material (not shown) such as paper or plastics, respective sides of thestrip 3 being electrically connected to respective parts of a printedcircuit board 24 byconnectors motor 27 to, in turn, rotate thecrankshaft 14 and hence oscillate thebrush heads FIGS. 2 and 3 . - The free end of the
strip 23 has a folded over region in the form of aring 28 onto which can be fitted ametal disc 29 which includes a domedcentral region 30 which may be pressed to temporarily connect both sides of thestrip 3 to complete the circuit between theconnectors toothbrush 1. As will be appreciated, because the “try me”feature 7 includes astrip 23 by which it allows a prospective purchaser of the toothbrush to determine if and how it works prior to purchase following pressing of themetal disc 29, after purchase the “try me”feature 7 can be effectively deactivated by simply pulling thestrip 23 away from the printedcircuit board 24 and hence out of engagement with theconnectors end cap 31 can be refitted onto thehousing 2 of thetoothbrush 1 in order to commence normal operation via pressing of thebutton 6.
Claims (19)
1. An electric toothbrush comprising, an electric motor, a first brush head and a second brush head; said first brush head is connected by driving structure to said motor; and a drive pin extends from said first brush head and is received in a guide slot within said second brush head, wherein a ball joint is defined between each of the driving structure and the first brush head, and the first brush head and the brush head and the second brush head.
2. An electric toothbrush according to claim 1 wherein said electric toothbrush comprises a housing containing said motor and upon which housing said first and second brush heads are mounted for oscillation.
3. An electric toothbrush according to claim 2 wherein said motor drives said first brush head in an oscillating manner, wherein as said first brush head oscillates the drive pin extending therefrom bears against the respective sides of said guide slot to thereby drive said second head in an oscillating manner.
4. An electric toothbrush according to claim 1 wherein said drive pin has a first end secured to said first head and a second end received in said guide slot, wherein said second end is a ball and said guide slot is formed to closely receive it therein.
5. An electric toothbrush according to claim 1 wherein said first brush head is located between said electric motor and said second brush head.
6. An electric toothbrush comprising an electric motor, a first brush head capable of movement, a second brush head capable of movement, a drive shaft operatively connected to and driven by said electric motor, said drive shaft being connected to said first brush head for movably driving said first brush head, a drive pin mounted at a first end of said drive pin to one of said first brush head and said second brush head and extending toward the other of said first brush head and said second brush head, said other of said brush head and said second brush head having a guide slot, said drive pin having a second end remote from said first end, said second end of said drive pin extending into said guide slot whereby said drive pin spans said first and said second brush heads without the need for other supporting structure, said drive pin being located at said first brush head at a location displaced from the location of the drive connection of said drive shaft to said first brush head, said drive pin being separate and distinct from said drive shaft, and movement of said first brush head by being driven by said drive shaft being transmitted to said second brush head through said drive pin for joint simultaneous movement of both said first brush head and said second brush head, wherein a ball joint is defined between each of the driving structure and the first brush head, and the first brush head and the brush head and the second brush head.
7. An electric toothbrush according to claim 6 wherein said electric motor is mounted in a hollow housing at least part of said drive shaft being in said housing, said housing terminating in a brush head holder, and said first brush head and said second brush head being mounted in said brush head holder.
8. An electric toothbrush according to claim 7 wherein each of said first brush head and said second brush head is mounted on pivot structure for rotational movement.
9. An electric toothbrush according to claim 8 wherein each of said brush heads is of disc shape, said pivot structure being a pivot pin for each of said first brush head and said second brush head mounted to said brush head holder, and bristles extending outwardly from each of said brush heads.
10. An electric toothbrush according to claim 6 wherein said first end of said drive pin is fixed to said first brush head.
11. An electric toothbrush according to claim 10 wherein said drive pin is mounted to said first brush head in a cantilevered manner.
12. An electric toothbrush according to claim 10 wherein said first brush head is located between said second brush head and said motor.
13. An electric toothbrush according to claim 6 wherein each of said brush heads is movably mounted for rotational oscillation in clockwise and counterclockwise directions.
14. An electric toothbrush according to claim 6 wherein said second end of said drive pin terminates in a ball closely received in said guide slot.
15. An electric toothbrush according to claim 6 further comprising a third brush head, a guide slot in said third brush head and a further drive pin mounted to one of said first brush head and said second brush head at one end thereof with a second end being mounted in said guide slot of said third brush head.
16. An electric toothbrush according to claim 6 wherein each of said brush heads is movably mounted in a rotational manner, and said drive pin being perpendicular to the axis of rotation of said first brush head.
17. An electric toothbrush according to claim 6 wherein each of said brush heads is movable in a rotational manner, each of said brush heads having an outer surface rotatable in a plane, and said plane of said second brush head being at an angle to said plane of said first brush head.
18. An electric toothbrush according to claim 17 wherein said plane of said second brush head is inclined inwardly toward said plane of said first brush head.
19. An electric toothbrush according to claim 6 wherein said first brush head and said second brush head are mounted in a brush head holder, said electric motor being mounted in a hollow housing, and said brush head holder being detachably mounted to said housing.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US11/455,534 US20060265825A1 (en) | 2001-10-04 | 2006-06-19 | Electric toothbrushes |
US12/976,665 US7992244B2 (en) | 2001-10-04 | 2010-12-22 | Electric toothbrushes |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US09/969,632 US20030066145A1 (en) | 2001-10-04 | 2001-10-04 | Electric toothbrushes |
US10/797,899 US20040168272A1 (en) | 2001-10-04 | 2004-03-10 | Electric toothbrushes |
US11/006,818 US20050177961A1 (en) | 2001-10-04 | 2004-12-08 | Electric toothbrushes |
US11/455,534 US20060265825A1 (en) | 2001-10-04 | 2006-06-19 | Electric toothbrushes |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/006,818 Continuation US20050177961A1 (en) | 2001-10-04 | 2004-12-08 | Electric toothbrushes |
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US12/976,665 Continuation US7992244B2 (en) | 2001-10-04 | 2010-12-22 | Electric toothbrushes |
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US20060265825A1 true US20060265825A1 (en) | 2006-11-30 |
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Application Number | Title | Priority Date | Filing Date |
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US09/969,632 Abandoned US20030066145A1 (en) | 2001-10-04 | 2001-10-04 | Electric toothbrushes |
US10/797,899 Abandoned US20040168272A1 (en) | 2001-10-04 | 2004-03-10 | Electric toothbrushes |
US11/006,818 Abandoned US20050177961A1 (en) | 2001-10-04 | 2004-12-08 | Electric toothbrushes |
US11/455,534 Abandoned US20060265825A1 (en) | 2001-10-04 | 2006-06-19 | Electric toothbrushes |
US12/976,665 Expired - Fee Related US7992244B2 (en) | 2001-10-04 | 2010-12-22 | Electric toothbrushes |
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Application Number | Title | Priority Date | Filing Date |
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US09/969,632 Abandoned US20030066145A1 (en) | 2001-10-04 | 2001-10-04 | Electric toothbrushes |
US10/797,899 Abandoned US20040168272A1 (en) | 2001-10-04 | 2004-03-10 | Electric toothbrushes |
US11/006,818 Abandoned US20050177961A1 (en) | 2001-10-04 | 2004-12-08 | Electric toothbrushes |
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Application Number | Title | Priority Date | Filing Date |
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US12/976,665 Expired - Fee Related US7992244B2 (en) | 2001-10-04 | 2010-12-22 | Electric toothbrushes |
Country Status (20)
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US (5) | US20030066145A1 (en) |
EP (2) | EP2295006B1 (en) |
JP (1) | JP2005503888A (en) |
KR (1) | KR20040048921A (en) |
CN (1) | CN1596086A (en) |
AT (1) | ATE486539T1 (en) |
AU (1) | AU2002331978B2 (en) |
CA (2) | CA2462422C (en) |
CO (1) | CO5570646A2 (en) |
DE (1) | DE60238211D1 (en) |
ES (2) | ES2357313T3 (en) |
HK (1) | HK1154195A1 (en) |
HU (1) | HUP0402090A2 (en) |
IL (1) | IL161220A0 (en) |
MX (1) | MXPA04003075A (en) |
PL (1) | PL373449A1 (en) |
RU (1) | RU2292857C2 (en) |
TR (1) | TR200400663T1 (en) |
WO (1) | WO2003028581A1 (en) |
ZA (1) | ZA200402554B (en) |
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Also Published As
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CO5570646A2 (en) | 2005-10-31 |
CA2772880C (en) | 2014-05-27 |
RU2292857C2 (en) | 2007-02-10 |
KR20040048921A (en) | 2004-06-10 |
EP2295006A2 (en) | 2011-03-16 |
ZA200402554B (en) | 2005-05-20 |
IL161220A0 (en) | 2004-09-27 |
DE60238211D1 (en) | 2010-12-16 |
CN1596086A (en) | 2005-03-16 |
EP1437982A1 (en) | 2004-07-21 |
EP2295006B1 (en) | 2012-11-14 |
EP1437982B1 (en) | 2010-11-03 |
ATE486539T1 (en) | 2010-11-15 |
US20050177961A1 (en) | 2005-08-18 |
RU2004113437A (en) | 2005-08-27 |
MXPA04003075A (en) | 2005-01-25 |
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HUP0402090A2 (en) | 2005-01-28 |
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HK1154195A1 (en) | 2012-04-13 |
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JP2005503888A (en) | 2005-02-10 |
US20030066145A1 (en) | 2003-04-10 |
CA2462422C (en) | 2012-06-05 |
TR200400663T1 (en) | 2005-10-21 |
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CA2462422A1 (en) | 2003-04-10 |
AU2002331978B2 (en) | 2008-04-10 |
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