Electric toothbrush with rotary bristle supporting structure

• US 5,577,285 A
• Filed: 07/15/1994
• Issued: 11/26/1996
• Est. Priority Date: 11/21/1992
• Status: Expired due to Term

• Current Assignee: Braun GmbH (The Procter & Gamble Company)
• Original Assignee: Braun Aktiengesellschaft
• Inventors: Drossler, Michael
• Primary Examiner(s): Spisich, Mark
• Application Number:
  US08/256,520
• Time in Patent Office: 865 Days
• Field of Search: 15/22.1, 15/22.4, 15/28, 15/29
• US Class Current: 15/22.1
• CPC Class Codes: A61C 17/3436 Rotation around the axis perpendicular to the plane defined by the bristle holder
• CPC Class Codes: A61C 17/349 with multiple brush bodies

Abstract

A brush section (24) for an electric toothbrush in which a rotary shaft (34) is received which is adapted to perform an alternating or a rotary motion. Mounted on the brush section (24) is a rotary bristle supporting structure (38) having its axis of rotation (54) disposed at about right angles to the axis of rotation (52) of the shaft (34). The shaft (34) receives movably therein a rod (102) disposed approximately parallel and eccentrically. In an annular shoulder (61) of the bristle supporting structure (38), a pin (112) is held, extending approximately parallel and eccentrically to the axis of rotation (54). The pin (112) is passed through an eyelet (103) provided at the free end of the rod (102) and is movable therein. When the shaft (34) is caused to perform a rotary or alternating motion, this motion is transmitted to the bristle supporting structure (38) through the rod (102), the eyelet (103), and the pin (112). The bristle supporting structure (38) will invariably perform a rotary alternating motion, irrespective of whether the shaft (34) is driven to perform an alternating or a rotary motion.

Claims

1. A brush section for an electric toothbrush having

a rotary shaft, said brush section receiving said rotary shaft when assembled onto the electric toothbrush and comprising:

a rotary bristle supporting structure operatively coupled to the shaft and having an axis of rotation that is at about a right angle to an axis of rotation of the shaft, and

a drive mechanism coupled to the shaft to drive the bristle supporting structure, said drive mechanism comprising

a first driving member driven by the shaft and disposed eccentrically to the axis of rotation of the shaft, and

a first driven member, operatively connected to said bristle supporting structure and disposed eccentrically to the axis of rotation of the bristle supporting structure, the first driving member and the first driven member being coupled to each other so as to prevent the driving member and the driven member from moving relative to each other in either direction that is parallel to the axis of the rotary shaft.

2. A brush section as claimed in claim 1, wherein the rotary shaft has a bore, arranged approximately parallel to the axis of rotation of the shaft and wherein the first driving member comprises a rod disposed in said bore.

3. A brush section as claimed in claim 1, wherein the rotary bristle supporting structure has a bore, arranged approximately parallel to the axis of rotation of the bristle supporting structure and wherein the first driven member comprises a pin disposed in said bore.

4. A brush section as claimed in claim 2, wherein the first driven member comprises a pin and wherein the rod has at a free end an eyelet through which the pin is passed, said rod being rotatable as well as axially movable inside the bore, said eyelet being rotatable about said pin as well as movable in the axial direction of the pin.

5. A brush section as claimed in claim 1 wherein the brush section further comprises an axle rotatable about the axis of rotation of the bristle supporting structure, said axle being pivotally mounted in the brush section and having the bristle supporting structure rotatably mounted thereon.

6. A brush section as claimed in claim 5, wherein the brush section further comprises

a ball bearing,

a bearing ball received in said ball bearing and connected to said axle.

7. A brush section as claimed in claim 2, wherein the rod is rotatably arranged in the bore of the shaft, while being non-displaceable in the axial direction along the bore of the shaft.

8. A brush section as claimed in claim 1, further comprising a second driving member and a second driven member coupled to said second driving member and wherein the bristle supporting structure includes an outer bristle ring and an inner bristle ring which are both rotatable about the axis of rotation of the bristle supporting structure, wherein the outer bristle ring is operatively associated with the first driven member and wherein the inner bristle ring is operatively associated with the second driven member.

9. A brush section as claimed in claim 8, wherein the first and the second driving members are disposed on relatively opposite sides of the axis of rotation of the shaft.

10. A brush section as claimed in claim 3, wherein the bore is eccentrically disposed in the bristle supporting structure and opens towards an underside of the bristle supporting structure, and wherein the first driven member and the first driving member are configured as an integral transmission element.

11. A brush section as claimed in claim 10, wherein the eccentrically disposed bore passes through a mid-section of the bristle supporting structure, the bore in the vicinity of said mid-section having an aperture extending towards a side wall of the bristle supporting structure.

12. A brush section as claimed in claim 10, wherein said first driving member comprises a rod having a diameter d, wherein said pin has a diameter D, wherein the transmission element formed by said pin and said rod is of a T-shaped configuration, and wherein the diameter d of the rod is smaller than the diameter D of the pin.

13. A brush section as claimed in claim 11, wherein a lower portion of the bore of the bristle supporting structure includes an opening which extends radially to the side wall in the manner of a longitudinal slot and includes a narrowing formed by extensions.

14. A brush section as claimed in claim 11, wherein a lower portion of the eccentrically disposed bore of the bristle supporting structure provides an essentially chord-like notch open towards the underside, said notch being in communication with a further notch provided in the side wall.

15. A brush section as claimed in claim 1 wherein the first driving member and the first driven member are integrally formed as a T-piece.

16. A brush section as claimed in claim 1, wherein the shaft includes a bore concentric with the axis of rotation of the shaft, said brush section further comprising

a cup-shaped socket having a second bore in a side wall thereof, and

a pin having one end disposed in the bore in the shaft and another end disposed in the second bore.

17. A brush section as claimed in claim 16, wherein the cup-shaped socket includes a third bore in its side wall, said bristle supporting structure includes a trunnion integrally formed therewith and having a recess, said brush section further comprising a pin having one end disposed in said third bore and another end disposed in said recess.

18. A brush section as claimed in claim 1, wherein the first driving member is axially displaceable with respect to the axis of rotation of the shaft.

19. A brush section as claimed in claim 1, wherein the bristle supporting structure includes a mount and the first driven member is held in the mount, is coupled thereto, and is axially displaceable along the axis of rotation of the bristle supporting structure.

20. A brush section as claimed in claim 19, wherein the brush section further comprises a limiting device that restricts displacement of the first driven member along the axis of rotation of the bristle supporting structure.

21. A brush section for an electric toothbrush having a rotary shaft, said brush section receiving said rotary shaft when assembled onto the electric toothbrush and comprising:

a rotary bristle supporting structure operatively coupled to the shaft and having an axis of rotation that is at about a right angle to an axis of rotation of the shaft, said bristle supporting structure having a bore, arranged approximately parallel to the axis of rotation of the bristle supporting structure, and

a drive mechanism coupled to the shaft to drive the bristle supporting structure, said drive mechanism comprising

a driving member driven by the shaft and disposed eccentrically to the axis of rotation of the shaft, and

a pin operatively connected to and disposed within said bore of said bristle supporting structure and disposed eccentrically to the axis of rotation of the bristle supporting structure, the driving member and the pin being coupled to each other so as to prevent the driving member and the pin from moving relative to each other in either direction that is parallel to the axis of the rotary shaft.

22. A brush section for an electric toothbrush having a rotary shaft having a bore, arranged approximately parallel to the axis of rotation of the shaft, said brush section receiving said rotary shaft when assembled onto the electric toothbrush and comprising:

a rotary bristle supporting structure operatively coupled to the shaft and having an axis of rotation that is at about a right angle to an axis of rotation of the shaft, and

a drive mechanism coupled to the shaft to drive the bristle supporting structure, said drive mechanism comprising

a rod driven by the shaft and disposed eccentrically to the axis of rotation of the shaft and within said bore of said shaft, said rod being rotatable as well as axially movable inside the bore, said rod having at a free end an eyelet, and

a pin operatively connected to said bristle supporting structure and disposed eccentrically to the axis of rotation of the bristle supporting structure and through said eyelet, said eyelet being rotatable about said pin as well as movable in the axial direction of said pin so as to prevent the rod and the pin from moving relative to each other in either direction that is parallel to the axis of the rotary shaft.

23. A brush section for an electric toothbrush having a rotary shaft, said brush section receiving said rotary shaft when assembled onto the electric toothbrush and comprising:

a rotary bristle supporting structure operatively coupled to the shaft and having an axis of rotation that is at about a right angle to an axis of rotation of the shaft,

an axle rotatable about the axis of rotation of the bristle supporting structure, said axle being pivotally mounted in the brush section and having the bristle supporting structure mounted thereon, and

a drive mechanism coupled to the shaft to drive the bristle supporting structure, said drive mechanism comprising

a driving member driven by the shaft and disposed eccentrically to the axis of rotation of the shaft, and

a driven member operatively connected to said bristle supporting structure and disposed eccentrically to the axis of rotation of the bristle supporting structure, the driving member and the driven member being coupled to each other so as to prevent the driving member and the driven member from moving relative to each other in either direction that is parallel to the axis of the rotary shaft.

24. A brush section for an electric toothbrush having a rotary shaft having a bore, arranged approximately parallel to the axis of rotation of the shaft, said brush section receiving said rotary shaft when assembled onto the electric toothbrush and comprising:

a rotary bristle supporting structure operatively coupled to the shaft and having an axis of rotation that is at about a right angle to an axis of rotation of the shaft, and

a drive mechanism coupled to the shaft to drive the bristle supporting structure, said drive mechanism comprising

a rod driven by the shaft and disposed eccentrically to the axis of rotation of the shaft and rotatably arranged in the bore of the shaft, while being non-displaceable in the axial direction along the bore of the shaft, and

a driven member operatively connected to said bristle supporting structure and disposed eccentrically to the axis of rotation of the bristle supporting structure, the rod and the driven member being coupled to each other so as to prevent the rod and the driven member from moving relative to each other in either direction that is parallel to the axis of the rotary shaft.

25. A brush section for an electric toothbrush having a rotary shaft, said brush section receiving said rotary shaft when assembled onto the electric toothbrush and comprising:

a rotary bristle supporting structure operatively coupled to the shaft and having an axis of rotation that is at about a right angle to an axis of rotation of the shaft, and

a drive mechanism coupled to the shaft to drive the bristle supporting structure, said drive mechanism comprising

a first driving member driven by the shaft and disposed eccentrically to the axis of rotation of the shaft,

a first driven member in contact with said bristle supporting structure and disposed eccentrically to the axis of rotation of the bristle supporting structure, the first driving member and the first driven member being coupled to each other so as to prevent the driving member and the driven member from moving relative to each other in either direction that is parallel to the axis of the rotary shaft, and

a second driving member and a second driven member coupled to said second driving member and wherein the bristle supporting structure includes an outer bristle ring and an inner bristle ring which are both rotatable about the axis of rotation of the bristle supporting structure, wherein the outer bristle ring is operatively associated with the first driven member and wherein the inner bristle ring is operatively associated with the second driven member.

26. A brush section for an electric toothbrush having a rotary shaft, said brush section receiving said rotary shaft when assembled onto the electric toothbrush and comprising:

a rotary bristle supporting structure operatively coupled to the shaft and having an axis of rotation that is at about a right angle to an axis of rotation of the shaft, said bristle supporting structure having a bore, arranged approximately parallel to the axis of rotation of the bristle supporting structure, the bore being eccentrically disposed in the bristle supporting structure and opening toward an underside of the bristle supporting structure, and

a drive mechanism coupled to the shaft to drive the bristle supporting structure, said drive mechanism comprising

a driving member driven by the shaft and disposed eccentrically to the axis of rotation of the shaft, and

a pin disposed within said bore of said bristle supporting structure, the driving member and the pin configured as an integral transmission element so as to prevent the driving member and the pin from moving relative to each other in either direction that is parallel to the axis of the rotary shaft.

27. A brush section for an electric toothbrush having a rotary shaft, said brush section receiving said rotary shaft when assembled onto the electric toothbrush and comprising:

a rotary bristle supporting structure operatively coupled to the shaft and having an axis of rotation that is at about a right angle to an axis of rotation of the shaft, said bristle supporting structure having a bore, arranged approximately parallel to the axis of rotation of the bristle supporting structure, and

a drive mechanism connected to the shaft to drive the bristle supporting structure, said drive mechanism comprising

a driving member operatively connected to the shaft and disposed eccentrically to the axis of rotation of the shaft, and

a driven member in contact with said bristle supporting structure and disposed eccentrically to the axis of rotation of the bristle supporting structure, the driven member and the driving member configured as an integral transmission element so as to prevent the driving member and the driven member from moving relative to each other in either direction that is parallel to the axis of the rotary shaft.

28. A brush section for an electric toothbrush having a rotary shaft, said brush section receiving said rotary shaft when assembled onto the electric toothbrush and comprising:

a rotary bristle supporting structure operatively coupled to the shaft and having an axis of rotation that is at about a right angle to an axis of rotation of the shaft, said bristle supporting structure having a bore, arranged approximately parallel to the axis of rotation of the bristle supporting structure, the bore being eccentrically disposed in the bristle supporting structure and opening toward an underside of the bristle supporting structure, and

a drive mechanism coupled to the shaft to drive the bristle supporting structure, said drive mechanism comprising

a rod driven by the shaft and disposed eccentrically to the axis of rotation of the shaft, wherein said rod has a diameter d, and

a pin, operatively connected to said bristle supporting structure, having a diameter D, wherein the rod and the pin are configured as an integral transmission element of a T-shaped configuration, and wherein the diameter d of the rod is smaller than the diameter D of the pin so as to prevent the pin and the rod from moving relative to each other in either direction that is parallel to the axis of the rotary shaft.

29. A brush section for an electric toothbrush having a rotary shaft, said brush section receiving said rotary shaft when assembled onto the electric toothbrush and comprising:

a rotary bristle supporting structure operatively coupled to the shaft and having an axis of rotation that is at about a right angle to an axis of rotation of the shaft, and

a drive mechanism coupled to the shaft to drive the bristle supporting structure, said drive mechanism comprising

a driving member driven by the shaft and disposed eccentrically to the axis of rotation of the shaft,

a driven member operatively connected to said bristle supporting structure and disposed eccentrically to the axis of rotation of the bristle supporting structure, the driving member and the driven member integrally formed as a T-piece so as to prevent the driving member and the driven member from moving relative to each other in either direction that is parallel to the axis of the rotary shaft.

30. A brush section for an electric toothbrush having a rotary shaft having a bore concentric with the axis of rotation of the shaft, said brush section receiving said rotary shaft when assembled onto the electric toothbrush and comprising:

a cup-shaped socket having a second bore in a side wall thereof,

a pin having one end disposed in the bore in the shaft and another end disposed in the second bore,

a rotary bristle supporting structure operatively coupled to the shaft and having an axis of rotation that is at about a right angle to an axis of rotation of the shaft, and

a drive mechanism coupled to the shaft to drive the bristle supporting structure, said drive mechanism comprising

a driving member driven by the shaft and disposed eccentrically to the axis of rotation of the shaft, and

a driven member operatively connected to said bristle supporting structure and disposed eccentrically to the axis of rotation of the bristle supporting structure, the driving member and the driven member being coupled to each other so as to prevent the driving member and the driven member from moving relative to each other in either direction that is parallel to the axis of the rotary shaft.

31. A brush section for an electric toothbrush having a rotary shaft, said brush section receiving said rotary shaft when assembled onto the electric toothbrush and comprising:

a rotary bristle supporting structure operatively coupled to the shaft and having an axis of rotation that is at about a right angle to an axis of rotation of the shaft, and

a drive mechanism coupled to the shaft to drive the bristle supporting structure, said drive mechanism comprising

a driving member driven by the shaft, disposed eccentrically to the axis of rotation of the shaft, and axially displaceable along the axis of rotation of the shaft, and

a driven member operatively connected to said bristle supporting structure and disposed eccentrically to the axis of rotation of the bristle supporting structure, the driving member and the driven member being coupled to each other so as to prevent the driving member and the driven member from moving relative to each other in either direction that is parallel to the axis of the rotary shaft.

32. A brush section for an electric toothbrush having a rotary shaft, said brush section receiving said rotary shaft when assembled onto the electric toothbrush and comprising:

a rotary bristle supporting structure operatively coupled to the shaft, said rotary bristle supporting structure having a mount and an axis of rotation that is at about a right angle to an axis of rotation of the shaft, and

a drive mechanism coupled to the shaft to drive the bristle supporting structure, said drive mechanism comprising

a driving member driven by the shaft and disposed eccentrically to the axis of rotation of the shaft, and

a driven member held in the mount of said bristle supporting structure, disposed eccentrically to the axis of rotation of the bristle supporting structure, and coupled thereto in respect of an axial displacement in the direction of the axis of rotation of the bristle supporting structure, the driving member and the driven member being coupled to each other so as to prevent the driving member and the driven member from moving relative to each other in either direction that is parallel to the axis of the rotary shaft.

33. An electric toothbrush comprising:

a handle section including a rotary shaft and a motor which drives said rotary shaft;

a brush section which assembles onto said handle section and receives said rotary shaft, said brush section comprising;

a rotary bristle supporting structure operatively coupled to the shaft and having an axis of rotation that is at about a right angle to an axis of rotation of the shaft, and

a drive mechanism coupled to the shaft to drive the bristle supporting structure, said drive mechanism comprising;

a first driving member driven by the shaft and disposed eccentrically to the axis of rotation of the shaft, and

a first driven member operatively connected to said bristle supporting structure and disposed eccentrically to the axis of rotation of the bristle supporting structure, the first driving member and the first driven member being coupled to each other so as to prevent the first driving member and the first driven member from moving relative to each other in either direction that is parallel to the axis of the rotary shaft.

34. An electric toothbrush as claimed in claim 33, wherein the rotary shaft is adapted to be driven so as to perform both an alternating and a rotary motion.

35. An electric toothbrush as claimed in claim 33, wherein the rotary shaft has a bore, arranged approximately parallel to the axis of rotation of the shaft and wherein the first driving member comprises a rod disposed in said bore.

36. An electric toothbrush as claimed in claim 33, wherein the rotary bristle supporting structure has a bore, arranged approximately parallel to the axis of rotation of the bristle supporting structure and wherein the first driven member comprises a pin disposed in said bore.

37. An electric toothbrush as claimed in claim 35, wherein the first driven member comprises a pin and wherein the rod has at a free end an eyelet through which the pin is passed, said rod being rotatable as well as axially movable inside the bore, said eyelet being rotatable about said pin as well as movable in the axial direction of the pin.

38. An electric toothbrush as claimed in claim 33 wherein the brush section further comprises an axle rotatable about the axis of rotation of the bristle supporting structure, said axle being pivotally mounted in the brush section and having the bristle supporting structure rotatably mounted thereon.

39. An electric toothbrush as claimed in claim 33, further comprising a second driving member and a second driven member coupled to said second driving member and wherein the bristle supporting structure includes an outer bristle ring and an inner bristle ring which are both rotatable about the axis of rotation of the bristle supporting structure, wherein the outer bristle ring is operatively associated with the first driven member and wherein the inner bristle ring is operatively associated with the second driven member.