Brush for sonic toothbrush with longitudinal axial vibration

Abstract

The brush comprises an elongated substrate, the substrate forming an adapter at a base portion for non-rotatably connecting to a sonic toothbrush drive portion for vibrating the brush about a longitudinal axis of the base. The head portion is formed with a bristle carrier having a large number of bristles implanted therein. Between the base portion and the head portion is formed an elongated neck portion. The substrate forms a bending angle such that the longitudinal axis of the base and the head portion orientation axis form an angle γ within a range of 7° to 17°. The bristle carrier has a runout (A) within a range of 5% to 15% with respect to the length (L) of the substrate. The large number of bristles are substantially perpendicular to the head portion orientation axis. The majority of the bristles have a bending stress σ within a range of 0.1 to 10 MPa. k where σ k =(π 3 / L 2 )·E·r 2 , π = pi (=3.14), E = elastic modulus of hair, r = half the diameter of the hair, L = length of hair (LB).

Claims

1. A brush for a sonic toothbrush having longitudinal axial vibration, comprising a vertically elongated base, the base having an adapter formed on the base portion that connects to a sonic toothbrush drive unit so as not to rotate relative to the base in order to vibrate the brush around the longitudinal axis of the base, and a head portion having a bristle support with numerous bristles planted on it, and a neck portion formed between the base portion and the head portion, The brush is configured such that when the following conditions a) through d) are met, the bristles perform a two-dimensional figure-eight motion during cleaning. a) The base is bent at an angle such that the lateral axis of the base portion and the orientation axis of the head portion form an angle γ in the range of 7° to 17°. b) The hair support has a runout in the range of 5% to 20% of the ratio of the distance between the center of the front of the head portion and the axis of the base portion in the hand direction to the length (L) of the base portion. c) The numerous hairs are substantially perpendicular to the orientation axis of the head portion, d) The main part of the hair is subjected to a bending stress σ in the range of 0.1 to 10 MPa. ｋ It has, and here, [Math 1] π = Pi (=3.14) E = Elastic modulus of the hair r = For hairs with a circular cross-section, half the diameter of the hair, or for hairs with a non-circular cross-section, half the average value between the maximum lateral dimension and the minimum lateral dimension. LB = length of the hair A brush for a sonic toothbrush having longitudinal axial vibration, characterized in that it is a sonic toothbrush.

2. The brush according to claim 1, characterized in that the bending stress is a maximum of 4 MPa.

3. The brush according to claim 1, characterized in that the bending stress is at most 1 MPa.

4. The brush according to claim 1, characterized in that the bending stress is at least 1 MPa.

5. The brush according to claim 1, characterized in that the bending stress is at least 4 MPa.

6. The brush according to claim 1, characterized in that the bending stress is within the range of 1 MPa to 4 MPa.

7. The brush according to claim 1, characterized in that the elastic modulus of the bristles is within the range of 1000 MPa to 3500 MPa.

8. The brush according to claim 1, characterized in that the elastic modulus of the bristles is 2000 MPa or less.

9. The brush according to claim 7, characterized in that the elastic modulus of the bristles is within the range of 2500 MPa to 3500 MPa.

10. The brush according to claim 1, characterized in that the average length of the bristles is within a range of up to 10 mm.

11. The brush according to claim 1, characterized in that the runout is within the range of 5% to 15%.

12. The brush according to claim 1, characterized in that the runout is within the range of 7% to 13%.

13. The brush according to claim 1, characterized in that the bristles have a diameter of 0.12 mm or less.

14. The brush according to claim 1, characterized in that the bristles have a maximum diameter of 0.1 mm.

15. The brush according to claim 1, characterized in that the bristles have a diameter of 0.08 to 0.12 mm.

16. The brush according to claim 1, characterized in that the angle γ is within the range of 12° to 17°.

17. The brush according to claim 1, characterized in that the angle γ is within the range of 7° to 12°.

18. The brush according to claim 1, characterized in that the bristles are arranged in the form of a tuft.

19. The brush according to claim 18, characterized in that the tufts are spaced apart from each other.

20. The brush according to claim 1, characterized in that it is provided with at least two different bristle lengths.

21. The brush according to claim 1, wherein the adapter, which is connected to the sonic toothbrush drive unit in a manner that prevents relative rotation, has a channel that receives the pin of the sonic toothbrush drive unit in a shape-coupled manner and extends parallel to the lateral axis of the base.

22. The brush according to claim 1, characterized in that the substrate has a material that performs a supporting function and has an elastic modulus of 6,000 MPa or less and an elastic modulus of 2,000 MPa or more.

23. A set comprising a brush as described in claim 1 and a handheld device having a sonic toothbrush drive unit, wherein the brush is insertable onto the sonic toothbrush drive unit, the handheld device drives the brush to vibrate around the handed axis of the base length, and the sonic toothbrush drive unit has an operating vibration frequency in the range of 150 Hz to 400 Hz.

24. A set comprising the brush described in Claim 1 and a handheld device having a sonic toothbrush drive unit, wherein the brush is insertable onto the sonic toothbrush drive unit, the handheld device drives the brush to vibrate around the handed axis of the base length, and the sonic toothbrush drive unit has an operating vibration frequency in the range of 150 Hz to 300 Hz.

25. The set according to claim 23 or 24, characterized in that the motor of the handheld device excites vibrations of a brush having an angular amplitude of up to 3° around the long axis of the base in the hand direction.

26. The set according to claim 25, characterized in that the adapter of the base portion has a channel, and the sonic toothbrush drive portion has a pin, the pin being shape-coupled and fittable into the channel to provide a coupling that holds the base portion so as not to rotate relative to the handed axis, and as a result the brush can be driven to vibrate as a whole around the base portion handed axis.

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