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US20110041268A1 - Electric toothbrush - Google Patents

Electric toothbrush Download PDF

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Publication number
US20110041268A1
US20110041268A1 US12/922,303 US92230309A US2011041268A1 US 20110041268 A1 US20110041268 A1 US 20110041268A1 US 92230309 A US92230309 A US 92230309A US 2011041268 A1 US2011041268 A1 US 2011041268A1
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US
United States
Prior art keywords
eccentric shaft
weight
main body
electric toothbrush
shaft
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
Application number
US12/922,303
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English (en)
Inventor
Toshiyuki Iwahori
Akitoshi Miki
Jun Shimoyama
Takashi Torihama
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.)
Omron Healthcare Co Ltd
Original Assignee
Omron Healthcare Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Omron Healthcare Co Ltd filed Critical Omron Healthcare Co Ltd
Assigned to OMRON HEALTHCARE CO., LTD. reassignment OMRON HEALTHCARE CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IWAHORI, TOSHIYUKI, MIKI, AKITOSHI, SHIMOYAMA, JUN, TORIHAMA, TAKASHI
Publication of US20110041268A1 publication Critical patent/US20110041268A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • A61C17/3481—Vibrating brush body, e.g. by using eccentric weights
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18544—Rotary to gyratory
    • Y10T74/18552—Unbalanced weight

Definitions

  • the present invention relates to an electric toothbrush.
  • Patent Document 1 Japanese Unexamined Patent Publication No. H10-192054
  • An object of the present invention is to provide an electric toothbrush capable of changing a resonant frequency and vibration amplitude of an eccentric shaft.
  • an electric toothbrush of the present invention includes:
  • the eccentric shaft is formed so that a gravity center position is movable at least in one direction among a direction in which a distance to a shaft center is changed and an axial direction.
  • vibration amplitude of the eccentric shaft can be changed.
  • a resonant frequency of the eccentric shaft can be changed.
  • the eccentric shaft may include a plurality of weights positioned so that gravity centers are shifted from the shaft center, and at least one of the plurality of weights may be provided rotatably relative to an eccentric shaft main body.
  • the electric toothbrush may include a first weight fixed to the eccentric shaft main body and positioned so that a gravity center is shifted from the shaft center, and
  • a regulated position of the second weight in a rotation direction may be differentiated by a rotation direction of the eccentric shaft.
  • the eccentric shaft may include a weight positioned so that a gravity center is shifted from the shaft center, and the weight may be provided movably in the axial direction relative to an eccentric shaft main body.
  • the gravity center position of the eccentric shaft can be moved in the axial direction.
  • a male screw may be formed in the eccentric shaft main body, and
  • a female screw to be screwed onto the male screw may be formed in the weight.
  • the weight can be moved in the axial direction by the rotation of the eccentric shaft main body.
  • the moving direction of the weight can be changed by the rotation direction of the eccentric shaft main body.
  • the weight may be fitted to the eccentric shaft main body slidably in the axial direction.
  • the weight is moved by gravitational force in accordance with a posture of the electric toothbrush.
  • the gravity center position of the eccentric shaft can be moved in the axial direction.
  • the eccentric shaft may include:
  • a second weight positioned so that a gravity center is shifted from the shaft center, the second weight being adapted to be rotatable relative to the eccentric shaft main body, and
  • the first weight and the second weight may be arranged in line in the axial direction so that a plurality of teeth provided in an end surface of the first weight and a plurality of teeth provided in an end surface of the second weight are meshed with each other, thereby forming a ratchet mechanism.
  • the eccentric shaft may include:
  • the weight is moved by the gravitational force and extension and compression of the coil spring in accordance with the posture of the electric toothbrush.
  • the gravity center position of the eccentric shaft can be moved in the axial direction.
  • the eccentric shaft main body and the weight are connected via the coil spring.
  • the weight is rotated after the rotation of the eccentric shaft main body. Therefore, at the time of start-up, the vibration amplitude of the eccentric shaft can be gradually increased.
  • the eccentric shaft may include
  • the eccentric shaft main body and the weight may be arranged in line in the axial direction while a fluid (fluid for transmitting rotation power (such as oil and grease)) is placed between the eccentric shaft main body and the weight.
  • a fluid fluid for transmitting rotation power (such as oil and grease)
  • the weight is slowly rotated at the beginning, rotation speed is gradually increased, and the rotation speed becomes the same as rotation speed of the eccentric shaft main body in the end. Accordingly, the gravity center of the eccentric shaft is gradually moved from a position of the shaft center to a position distant from the shaft center. Therefore, at the time of start-up, the vibration amplitude of the eccentric shaft is gradually increased.
  • a bearing for supporting the other end of the eccentric shaft may be provided in the vibration transmitting component.
  • the vibration generated in the vicinity of the bearing which is provided in the vibration transmitting component can be transmitted to the brush portion.
  • the bearing is provided on the side of the other end of the eccentric shaft, that is, in the vicinity of the brush portion which is distant from the rotation shaft of the motor.
  • the vibration can be efficiently transmitted to the brush portion.
  • the resonant frequency and the vibration amplitude of the eccentric shaft can be changed.
  • FIG. 1 is an exploded perspective view of parts of an electric toothbrush according to an embodiment of the present invention.
  • FIG. 2 is a schematic sectional view of the electric toothbrush according to the embodiment of the present invention.
  • FIGS. 3( a ) and 3 ( b ) are illustrative views for a mechanism in a case where a distance between a gravity center position of an eccentric shaft and a shaft center is changed in the electric toothbrush according to the embodiment of the present invention.
  • FIGS. 4( a ) and 4 ( b ) are illustrative views for a mechanism in a case where the gravity center position of the eccentric shaft is moved in the axial direction in the electric toothbrush according to the embodiment of the present invention.
  • FIG. 5 is a perspective view of the eccentric shaft of the electric toothbrush according to a first example of the present invention.
  • FIG. 6 is a perspective view of the eccentric shaft of the electric toothbrush according to the first example of the present invention.
  • FIG. 7 is a graph showing a relationship between a vibration frequency and vibration amplitude in the electric toothbrush according to the first example of the present invention.
  • FIGS. 8( a ) and 8 ( b ) are perspective views of the eccentric shaft of the electric toothbrush according to a second example of the present invention.
  • FIG. 9 is a graph showing a relationship between the vibration frequency and the vibration amplitude in the electric toothbrush according to the second example of the present invention.
  • FIGS. 10( a ) and 10 ( b ) are perspective views of the eccentric shaft of the electric toothbrush according to a third example of the present invention.
  • FIGS. 11( a ) and 11 ( b ) are perspective views of the eccentric shaft of the electric toothbrush according to a fourth example of the present invention.
  • FIGS. 12( a ) and 12 ( b ) are perspective views of the eccentric shaft of the electric toothbrush according to a fifth example of the present invention.
  • FIGS. 13( a ) and 13 ( b ) are perspective views of the eccentric shaft of the electric toothbrush according to a sixth example of the present invention.
  • FIGS. 14( a ) to 14 ( c ) are perspective views of the eccentric shaft of the electric toothbrush according to a seventh example of the present invention.
  • FIG. 15 is a graph showing a relationship between elapsed time at the time of start-up and maximum vibration amplitude in the electric toothbrush according to the seventh example of the present invention.
  • FIG. 16 is an exploded view of parts of the eccentric shaft and a stem in the electric toothbrush according to the seventh example of the present invention.
  • FIG. 17 is a schematic sectional view of the eccentric shaft and the stem in the electric toothbrush according to the seventh example of the present invention.
  • FIG. 18 is an exploded view of parts of the eccentric shaft and the stem in the electric toothbrush according to the seventh example of the present invention.
  • FIG. 19 is a schematic sectional view of the eccentric shaft and the stem in the electric toothbrush according to the seventh example of the present invention.
  • FIG. 1 is an exploded perspective view of parts of the electric toothbrush according to the embodiment of the present invention.
  • FIG. 2 is a schematic sectional view of the electric toothbrush according to the embodiment of the present invention.
  • FIGS. 3( a ) and 3 ( b ) are illustrative views for a mechanism in a case where a distance between a gravity center position of an eccentric shaft and a shaft center is changed in the electric toothbrush according to the embodiment of the present invention.
  • FIGS. 4( a ) and 4 ( b ) are illustrative views for a mechanism in a case where the gravity center position of the eccentric shaft is moved in the axial direction in the electric toothbrush according to the embodiment of the present invention.
  • An electric toothbrush 1 is provided with an electric toothbrush main body 2 , an eccentric shaft 100 , a stem 3 serving as a vibration transmitting component, and a brush component 4 having a brush portion 41 .
  • the electric toothbrush main body 2 is provided with a case 21 , a battery 22 and a motor 23 accommodated inside the case 21 , a switch 24 for turning ON/OFF a power supply, and an operation unit 25 including a group of buttons for changing various modes.
  • One end of the eccentric shaft 100 is fixed to a rotation shaft 23 a of the motor 23 .
  • the eccentric shaft 100 is formed so as to protrude from an opening of a front end of the case 21 toward the outside of the case 21 .
  • a weight 120 positioned so that a gravity center is shifted from the shaft center is provided in the eccentric shaft 100 .
  • the other end of the eccentric shaft 100 is supported by a bearing 31 provided in the stem 3 .
  • the brush component 4 is installed so as to cover the stem 3 .
  • a main body part of the brush component 4 is formed by a tubular member so as to be installed to the stem 3 , and the brush portion 41 is provided in a front end thereof.
  • the brush component 4 is a consumable item and hence detachable from the stem 3 so as to be timely replaced by a new item.
  • the stem 3 provided with the bearing 31 can be vibrated via the bearing 31 .
  • the vibration can be transmitted to the brush component 4 fixed to the stem 3 . Therefore, the brush portion 41 is vibrated by the vibration of the brush component 4 .
  • the brush portion 41 is applied onto teeth, the teeth can be brushed.
  • the eccentric shaft 100 in the present embodiment is formed so that a gravity center position is movable at least in one direction among the direction in which a distance to a shaft center is changed and the axial direction.
  • first weight 121 two weights (hereinafter, referred to as the first weight 121 , the second weight 122 ) are provided in the eccentric shaft main body 110 .
  • the first weight 121 and the second weight 122 are provided at positions where gravity centers are shifted from the shaft center (in the figures, the symbol G 1 denotes a gravity center position of the first weight 121 and the symbol G 2 denotes a gravity center position of the second weight 122 ).
  • Shapes and weights of the first weight 121 and the second weight 122 are the same.
  • FIG. 3( a ) shows a case where the gravity center position 01 of the first weight 121 and the gravity center position G 2 of the second weight 122 correspond to each other seen in the axial direction.
  • a gravity center position G 3 of the eccentric shaft 100 seen in the axial direction corresponds to G 1 and G 2 .
  • the symbol R 1 denotes a distance between the gravity center position G 3 of the eccentric shaft 100 and the shaft center at this time.
  • FIG. 3( b ) shows a case where the second weight 122 is rotated by 90° from the state shown in FIG. 3( a ).
  • the gravity center position G 1 of the first weight 121 and the gravity center position G 2 of the second weight 122 are in a positional relationship in which the gravity center positions are shifted from each other by 90° relative to the shaft center seen in the axial direction.
  • the gravity center position G 3 of the eccentric shaft 100 seen in the axial direction is a position of a midpoint between G 1 and G 2 .
  • R 2 denotes a distance between the gravity center position G 3 of the eccentric shaft 100 and the shaft center at this time, R 2 ⁇ R 1 .
  • the gravity center position of the eccentric shaft 100 can be moved in the direction in which the distance to the shaft center is changed.
  • the weight of the eccentric shaft main body 110 is ignored for convenience sake.
  • the actual gravity center of the eccentric shaft 100 is also influenced by the weight of the eccentric shaft main body 110 .
  • the fact remains that by rotating the second weight 122 , the distance between the gravity center of the eccentric shaft 100 and the shaft center is changed.
  • the case where the shapes and the weights of the first weight 121 and the second weight 122 are the same is exemplified and described in order to simplify the model.
  • the distance between the gravity center of the eccentric shaft 100 and the shaft center is changed.
  • a weight 123 is provided movably in the axial direction relative to the eccentric shaft main body 110 .
  • a distance in the axial direction between the bearing and a gravity center position of the weight 123 (denoted by the symbol L 11 in FIG. 4( a ) and the symbol L 12 in FIG. 4( b )) and a distance in the axial direction between a part fixed to the rotation shaft of the motor and the gravity center position of the weight 123 (denoted by the symbol L 21 in FIG.
  • FIG. 4( b ) shows an example in which a position of the weight 123 is moved closer to the side of the bearing than an example shown in FIG. 4( a ). At this time, L 11 >L 12 , and L 21 ⁇ L 22 .
  • the gravity center position of the eccentric shaft 100 can be moved in the axial direction.
  • the gravity center position of the eccentric shaft 100 can be moved in the direction in which the distance to the shaft center is changed, and at the same time, the gravity center position of the eccentric shaft 100 can be moved in the axial direction.
  • the eccentric shaft 100 for vibrating the brush portion 41 is formed so that the gravity center position is movable at least in one direction among the direction in which the distance to the shaft center is changed and the axial direction.
  • the vibration amplitude of the eccentric shaft 100 can be changed.
  • the resonant frequency of the eccentric shaft 100 can be changed.
  • the rotation number of the rotation shaft of the motor is set so that resonance is generated in various members including the brush portion in order to efficiently vibrate the brush portion.
  • the resonance can be more reliably generated.
  • a vibrating manner of tips of the brush (a degree of sideward vibration and a degree of vertical vibration) is differentiated by the frequency at the time of generating the resonance.
  • the feel of brushing is also differentiated at the time of brushing the teeth.
  • the vibration manner of the tip which is suitable for brushing is differentiated respectively for a part of the teeth to be brushed.
  • the resonant frequency of the eccentric shaft 100 changeable, the vibrating manner of the tips of the brush can be changed.
  • the resonance is generated with desired resonant frequencies.
  • the mode may be changed by the operation unit 25 so as to change the rotation number to the several other rotation numbers.
  • FIGS. 5 to 7 the electric toothbrush according to a first example of the present invention will be described.
  • the eccentric shaft according to the present example is a more specific example of the embodiment described with reference to FIGS. 3( a ) and 3 ( b ).
  • FIGS. 5 and 6 are perspective views of the eccentric shaft of the electric toothbrush according to the first example of the present invention.
  • FIG. 7 is a graph showing a relationship between a vibration frequency and the vibration amplitude in the electric toothbrush according to the first example of the present invention.
  • a hole portion 111 a into which a front end of the rotation shaft 23 a of the motor 23 is fitted is provided in one end of the eccentric shaft main body 111 .
  • a first weight 124 is fixed to the other end of the eccentric shaft main body 111 .
  • a substantially-disc portion 124 c provided with a cutout portion 124 b is provided in a distal end of a weight main body portion 124 a .
  • a second weight 125 is provided in line in the axial direction on the side of a front end of the first weight 124 .
  • a shaft portion 125 b supported by the bearing 31 of the stem 3 is provided in a front end of a weight main body portion 125 a .
  • a disc portion 125 d having a lock projection 125 c is provided in the other end of the weight main body portion 125 a.
  • the second weight 125 and the eccentric shaft main body 111 are not fixed to each other. However, inside the electric toothbrush 1 , the second weight 125 and the eccentric shaft main body 111 are formed so that center shafts are not shifted from each other. In a specific configuration for realizing this, a convex portion (or a concave portion) is formed on the shaft center of an end surface of the second weight 125 , a concave portion (or a convex portion) is provided on the shaft center of an end surface of the eccentric shaft main body 111 (an end surface of the first weight 124 ), and the second weight 125 and the eccentric shaft main body 111 are arranged in line in the axial direction so that the convex and concave portions are fitted to each other.
  • the inner wall surface of the stem 3 may function as a bearing for the weight main body portion 124 a of the first weight 124 and the weight main body portion 125 a of the second weight 125 .
  • the second weight 125 can be rotated within a range in which the lock projection 125 c is not disturbed by the substantially-disc portion 124 c relative to the eccentric shaft main body 111 .
  • the second weight 125 is rotated together with the eccentric shaft main body 111 in a state that the rotation relative to the eccentric shaft main body 111 is regulated by abutting the lock projection 125 c with a left end (in the figure) of the cutout portion 124 b in the substantially-disc portion 124 c .
  • a positional relationship between the gravity center position of the first weight 124 and the gravity center position of the second weight 125 at this time corresponds to the model shown in FIG. 3( b ).
  • the second weight 125 is rotated together with the eccentric shaft main body 111 in a state that the rotation relative to the eccentric shaft main body 111 is regulated by abutting the lock projection 125 c with a right end (in the figure) of the cutout portion 124 b in the substantially-disc portion 124 c .
  • a positional relationship between the gravity center position of the first weight 124 and the gravity center position of the second weight 125 at this time corresponds to the model shown in FIG. 3( a ).
  • the eccentric shaft according to the present example by switching the rotation direction of the rotation shaft 23 a of the motor 23 , the gravity center position of the eccentric shaft can be moved in the direction in which the distance to the shaft center is changed. Thereby, the vibration amplitude of the eccentric shaft can be changed.
  • the mode may be changed by the operation unit 25 so as to switch the rotation direction of the rotation shaft 23 a of the motor 23 .
  • FIG. 7 shows the relationship between the vibration frequency and the vibration amplitude in a case where the present example is adopted.
  • a graph P 1 in FIG. 7 corresponds to a case where the eccentric shaft is rotated in the state shown in FIG. 5
  • a graph P 2 corresponds to a case where the eccentric shaft is rotated in the state shown in FIG. 6 .
  • FIGS. 8( a ), 8 ( b ), and FIG. 9 the electric toothbrush according to a second example of the present invention will be described.
  • the eccentric shaft according to the present example is a more specific example of the embodiment described with reference to FIGS. 4( a ) and 4 ( b )
  • FIGS. 8( a ) and 8 ( b ) are perspective views of the eccentric shaft of the electric toothbrush according to the second example of the present invention.
  • FIG. 9 is a graph showing a relationship between the vibration frequency and the vibration amplitude in the electric toothbrush according to the second example of the present invention.
  • a hole portion 112 a into which the front end of the rotation shaft 23 a of the motor 23 is fitted is provided in one end of the eccentric shaft main body, and a shaft portion 112 b supported by the bearing 31 of the stem 3 is provided in the other end.
  • a male screw 112 c is formed within a predetermined range of the eccentric shaft main body 112 according to the present example.
  • a first position regulation portion 112 d is provided in a lower end in an area in which the male screw 112 c is formed, and a disc shape second position regulation portion 112 e is provided in an upper end.
  • Pass-through holes 126 a in which female screws to be screwed onto the male screw 112 c are formed are provided in a weight 126 according to the present example.
  • the weight 126 is not rotated relative to the eccentric shaft main body 112 or moved downward while being rotated by co-rotation by slower speed than the eccentric shaft main body 112 .
  • the weight 126 is rotated together with the eccentric shaft main body 112 .
  • the weight 126 is not rotated relative to the eccentric shaft main body 112 or moved upward while being rotated by the co-rotation by slower speed than the eccentric shaft main body 112 .
  • FIG. 8( a ) corresponds to the model of FIG. 4( a )
  • FIG. 8( b ) corresponds to the model of FIG. 4( b ).
  • sufficient clearances are desirably provided between the female screws formed in the pass-through holes 126 a and the male screw 112 c so that the weight 126 is more reliably moved in the axial direction in a case where the eccentric shaft main body 112 is rotated.
  • the eccentric shaft according to the present example by switching the rotation direction of the rotation shaft 23 a of the motor 23 , the gravity center position of the eccentric shaft can be moved in the axial direction. Thereby, the resonant frequency of the eccentric shaft can be changed.
  • the mode may be changed by the operation unit 25 so as to switch the rotation direction of the rotation shaft 23 a of the motor 23 .
  • FIG. 9 shows the relationship between the vibration frequency and the vibration amplitude in a case where the present example is adopted.
  • a graph P 3 in FIG. 9 corresponds to a case where the eccentric shaft is rotated in the state shown in FIG. 8( a ), and a graph P 4 corresponds to a case where the eccentric shaft is rotated in the state shown in FIG. 8( b ).
  • a graph P 5 in FIG. 9 corresponds to a case where the weight 126 is positioned in the vicinity of a center of an area in which the male screw 112 c is formed in the eccentric shaft main body 112 .
  • FIGS. 10( a ) and 10 ( b ) With reference to FIGS. 10( a ) and 10 ( b ), the electric toothbrush according to a third example of the present invention will be described.
  • the eccentric shaft according to the present example is a more specific example of the embodiment described with reference to FIGS. 4( a ) and 4 ( b ).
  • FIGS. 10( a ) and 10 ( b ) are perspective views of the eccentric shaft of the electric toothbrush according to the third example of the present invention.
  • an eccentric shaft main body 113 in the eccentric shaft according to the present example a hole portion 113 a into which the front end of the rotation shaft 23 a of the motor 23 is fitted is provided in one end of the eccentric shaft main body, and an insertion hole 113 b is provided in the other end.
  • a weight 127 in the eccentric shaft according to the present example a shaft portion 127 b to be inserted into the insertion hole 113 b is provided in one end of the weight, and a shaft portion 127 a supported by the bearing 31 of the stem 3 is provided in the other end.
  • FIG. 10( a ) corresponds to the model of FIG. 4( b ), and FIG. 10( b ) corresponds to the model of FIG. 4( a ).
  • FIGS. 11( a ) and 11 ( b ) With reference to FIGS. 11( a ) and 11 ( b ), the electric toothbrush according to a fourth example of the present invention will be described.
  • the eccentric shaft according to the present example is a more specific example of the embodiment described with reference to FIGS. 4( a ) and 4 ( b ).
  • FIGS. 11( a ) and 11 ( b ) are perspective views of the eccentric shaft of the electric toothbrush according to the fourth example of the present invention.
  • a hole portion 114 a into which the front end of the rotation shaft 23 a of the motor 23 is fitted is provided in one end of the eccentric shaft main body, and a first weight 114 c provided with a protruding portion 114 b is fixed to the other end.
  • a second weight 128 is provided in line in the axial direction on the side of a distal end of the eccentric shaft main body 114 .
  • a slit portion 128 b into which the protruding portion 114 b is inserted is provided in one end of the second weight, and a shaft portion 128 a supported by the bearing 31 of the stem 3 is provided in the other end.
  • the protruding portion 114 b of the eccentric shaft main body 114 can be inserted into and taken out from the slit portion 128 b of the second weight 128 with little insertion and take-out force.
  • FIG. 11( a ) corresponds to the model of FIG. 4( b ), and FIG. 11( b ) corresponds to the model of FIG. 4( a ).
  • FIGS. 12( a ) and 12 ( b ) are perspective views of the eccentric shaft of the electric toothbrush according to the fifth example of the present invention.
  • a hole portion 115 a into which the front end of the rotation shaft 23 a of the motor 23 is fitted is provided in one end of the eccentric shaft main body, and a first weight 115 b is fixed to the other end.
  • a plurality of teeth 115 c is provided in an end surface of the first weight 115 b.
  • the second weight 129 is rotated relative to the first weight 115 b fixed to the eccentric shaft main body 115 . Therefore, in this case, the distance between the gravity center position of the eccentric shaft and the shaft center can be changed. In a case where the second weight 129 is rotated relative to the first weight 115 b , the second weight 129 is also moved in the axial direction for getting over the teeth 115 c , 129 c respectively provided in the weights. Thus, the gravity center position of the eccentric shaft can be periodically moved in the axial direction.
  • FIGS. 13( a ) and 13 ( b ) are perspective views of the eccentric shaft of the electric toothbrush according to the sixth example of the present invention.
  • a hole portion 116 a into which the front end of the rotation shaft 23 a of the motor 23 is fitted is provided in one end of the eccentric shaft main body.
  • a weight 130 is provided in line in the axial direction on the side of a distal end of the eccentric shaft main body 116 .
  • a shaft portion 130 a supported by the bearing 31 of the stem 3 is provided in a front end of the weight 130 .
  • a coil spring 140 is provided between the eccentric shaft main body 116 and the weight 130 . One end of the coil spring 140 is fixed to the eccentric shaft main body 116 , and the other end is fixed to the weight 130 .
  • FIG. 13( b ) shows a state after sufficient time elapses and the rotation speed of the weight 130 becomes the same as the rotation speed of the eccentric shaft main body 116 .
  • the number of arrows indicates a difference in the rotation speed (the more the arrows are, the faster the rotation speed is).
  • the gravity center of the eccentric shaft is hardly influenced by a weight of the weight 130 immediately after the start-up.
  • the rotation speed of the weight 130 becomes faster, the influence of the weight of the weight 130 gradually becomes larger.
  • the gravity center of the eccentric shaft is gradually moved from a position of the shaft center to a position distant from the shaft center. Therefore, at the time of start-up, the vibration amplitude of the eccentric shaft is gradually increased.
  • the brush portion 41 can be prevented from radically vibrating immediately after the power supply is turned on, and feel of stimulation can be suppressed.
  • FIGS. 14( a ) to 14 ( c ) and FIG. 15 are perspective views of the eccentric shaft of the electric toothbrush according to the seventh example of the present invention.
  • FIG. 15 is a graph showing a relationship between elapsed time at the time of start-up and maximum vibration amplitude in the electric toothbrush according to the seventh example of the present invention.
  • an eccentric shaft main body 117 in the eccentric shaft a hole portion 117 a into which the front end of the rotation shaft 23 a of the motor 23 is fitted is provided in one end of the eccentric shaft main body.
  • a weight 131 is provided in line in the axial direction on the side of a distal end of the eccentric shaft main body 117 .
  • a shaft portion 131 a supported by the bearing 31 of the stem 3 is provided in a front end of the weight 131 .
  • a fluid (such as oil and grease) is placed in a clearance S between the eccentric shaft main body 117 and the weight 131 .
  • FIG. 14( a ) shows a state immediately after the start-up
  • FIG. 14( b ) shows a state time elapses a little after the start-up
  • FIG. 14( c ) shows a state after sufficient time elapses and the rotation speed of the weight 131 becomes the same as the rotation speed of the eccentric shaft main body 117 .
  • the number of arrows indicates a difference in the rotation speed (the more the arrows are, the faster the rotation speed is).
  • the gravity center of the eccentric shaft is hardly influenced by a weight of the weight 131 immediately after the start-up.
  • the rotation speed of the weight 131 becomes faster, the influence of the weight of the weight 131 gradually becomes larger.
  • the gravity center of the eccentric shaft is gradually moved from a position of the shaft center to a position distant from the shaft center. Therefore, at the time of start-up, the vibration amplitude of the eccentric shaft is gradually increased.
  • the brush portion 41 can be prevented from radically vibrating immediately after the power supply is turned on, and the feel of stimulation can be suppressed.
  • a graph P 6 shows the elapsed time at the time of start-up and the maximum vibration amplitude in the eccentric shaft according to the present example.
  • a graph P 7 in the figure shows the elapsed time at the time of start-up and the maximum vibration amplitude in a case where the weight is fixed to the eccentric shaft (comparative example).
  • the weight 131 and the eccentric shaft main body 117 are not fixed to each other. However, inside the electric toothbrush 1 , the weight 131 and the eccentric shaft main body 117 are required to be formed so that center shafts are not shifted from each other. Two examples of configurations for realizing this will be described. Configurations described below can be applied to the relationship between the second weight 125 and the eccentric shaft main body 111 in the first example described above.
  • the eccentric shaft main body 117 is formed by a trunk 117 X in which the hole portion 117 a is provided in one end, and a metal component 117 Y excellent in a wear characteristic to be fixed to a front end of this trunk 117 X.
  • the trunk 117 X is made of resin or elastomer.
  • a concave portion 117 Ya is formed in a front end of the metal component 117 Y.
  • a convex portion 131 b to be fitted to the concave portion 117 Ya of the metal component 117 Y is provided in an end of the weight 131 on the opposite side of the shaft portion 131 a.
  • the center shafts can be prevented from being shifted from each other without fixing the weight 131 and the eccentric shaft main body 117 .
  • the eccentric shaft main body 117 is formed by the trunk 117 X in which the hole portion 117 a is provided in the one end, and the metal component 117 Y excellent in the wear characteristic to be fixed to the front end of the trunk 117 X.
  • the trunk 117 X is made of resin or elastomer.
  • the front end of the metal component 117 Y is formed into a plane.
  • the end of the weight 131 on the opposite side of the shaft portion 131 a is formed into a plane.
  • a clearance S between the inner wall surface 32 of the stem 3 and an outer circumferential surface of the metal component 117 Y and between the inner wall surface 32 of the stem 3 and an outer circumferential surface of the weight 131 is set to be as small as possible.
  • the inner wall surface 32 of the stem 3 functions as a bearing for the metal component 117 Y and the weight 131 .
  • the center shafts can be prevented from being shifted from each other without fixing the weight 131 and the eccentric shaft main body 117 .
  • the case where the end of the eccentric shaft on the opposite side of the end fixed to the rotation shaft 23 a of the motor 23 is supported by the bearing 31 provided in the stem 3 is exemplified and described.
  • the stem 3 is vibrated via the bearing 31 , and the vibration is transmitted to the brush component 4 . Since the bearing 31 is positioned in the vicinity of the brush portion 41 , the vibration can be efficiently transmitted to the brush portion 41 .
  • the electric toothbrush in which the eccentric shaft is adopted, there is a type of electric toothbrush in which an eccentricity weight is arranged in the vicinity of the rotation shaft of the motor so that the end of the eccentric shaft on the opposite side of the end fixed to the rotation shaft of the motor is not supported by the bearing (the distal end of the eccentric shaft serves as a free end).
  • the present invention can be also applied to such a type of electric toothbrush. That is, the above eccentric shaft may be applied to such a type of electric toothbrush.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Brushes (AREA)
US12/922,303 2008-03-13 2009-02-17 Electric toothbrush Abandoned US20110041268A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2008-064628 2008-03-13
JP2008064628A JP5194904B2 (ja) 2008-03-13 2008-03-13 電動歯ブラシ
PCT/JP2009/052702 WO2009113368A1 (fr) 2008-03-13 2009-02-17 Brosse à dents électrique

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2009/052702 A-371-Of-International WO2009113368A1 (fr) 2008-03-13 2009-02-17 Brosse à dents électrique

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/836,394 Continuation US8806691B2 (en) 2008-03-13 2013-03-15 Electric toothbrush

Publications (1)

Publication Number Publication Date
US20110041268A1 true US20110041268A1 (en) 2011-02-24

Family

ID=41065040

Family Applications (2)

Application Number Title Priority Date Filing Date
US12/922,303 Abandoned US20110041268A1 (en) 2008-03-13 2009-02-17 Electric toothbrush
US13/836,394 Active US8806691B2 (en) 2008-03-13 2013-03-15 Electric toothbrush

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Application Number Title Priority Date Filing Date
US13/836,394 Active US8806691B2 (en) 2008-03-13 2013-03-15 Electric toothbrush

Country Status (6)

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US (2) US20110041268A1 (fr)
JP (1) JP5194904B2 (fr)
CN (1) CN101965160B (fr)
DE (1) DE112009000534B4 (fr)
RU (1) RU2457808C2 (fr)
WO (1) WO2009113368A1 (fr)

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US8863343B2 (en) * 2010-02-02 2014-10-21 Omron Healthcare Co., Ltd. Oral care apparatus
US20120251975A1 (en) * 2010-02-02 2012-10-04 Omron Healthcare Co., Ltd. Oral care apparatus
US9154025B2 (en) 2010-07-23 2015-10-06 Braun Gmbh Personal care device
US10470857B2 (en) 2010-07-23 2019-11-12 Braun Gmbh Personal care device
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WO2012151259A1 (fr) * 2011-05-02 2012-11-08 Water Pik, Inc. Brosse à dents sonique à entraînement mécanique
US8943634B2 (en) 2011-05-02 2015-02-03 Water Pik, Inc. Mechanically-driven, sonic toothbrush system
US9144477B2 (en) 2011-05-02 2015-09-29 Water Pik, Inc. Mechanically-driven, sonic toothbrush system
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US9468511B2 (en) 2013-03-15 2016-10-18 Water Pik, Inc. Electronic toothbrush with vibration dampening
USD878765S1 (en) 2013-03-15 2020-03-24 Water Pik, Inc. Brush head for oral cleansing device
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US10449023B2 (en) 2015-07-08 2019-10-22 Water Pik, Inc. Oral cleansing device with energy conservation
US11284980B2 (en) 2015-07-08 2022-03-29 Water Pik, Inc. Oral cleansing device with rotatable fluid connector
US10561480B2 (en) 2016-05-09 2020-02-18 Water Pik, Inc. Load sensing for oral devices
USD845636S1 (en) 2016-12-15 2019-04-16 Water Pik, Inc. Toothbrush handle
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USD881584S1 (en) 2016-12-15 2020-04-21 Water Pik, Inc. Toothbrush handle
US10610008B2 (en) 2016-12-15 2020-04-07 Water Pik, Inc. Brushing device with illumination features
USD844997S1 (en) 2016-12-15 2019-04-09 Water Pik, Inc. Toothbrush handle
US10682212B2 (en) * 2017-05-18 2020-06-16 Panasonic Intellectual Property Management Co., Ltd. Electric toothbrush
US11730579B2 (en) * 2020-02-05 2023-08-22 Jishan D-Max Electronics Co., Ltd. Vibration structure of electrical toothbrush

Also Published As

Publication number Publication date
JP5194904B2 (ja) 2013-05-08
RU2010141820A (ru) 2012-04-20
US8806691B2 (en) 2014-08-19
CN101965160A (zh) 2011-02-02
US20130198980A1 (en) 2013-08-08
JP2009219544A (ja) 2009-10-01
CN101965160B (zh) 2013-04-03
DE112009000534B4 (de) 2017-10-19
DE112009000534T5 (de) 2011-01-20
WO2009113368A1 (fr) 2009-09-17
RU2457808C2 (ru) 2012-08-10

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