Plaque removing toothbrush

• US 5,335,389 A
• Filed: 03/29/1990
• Issued: 08/09/1994
• Est. Priority Date: 03/29/1990
• Status: Expired due to Term

• Current Assignee: Colgate-Palmolive Company
• Original Assignee: Colgate-Palmolive Company
• Inventors: Kemp, James H., Crawford, John C., Mintel, Thomas E., Curtis, John P., Heinzelman, Bert D., Lamond, Donald R., Rustogi, Kedar N., Edelman, Laura H.
• Primary Examiner(s): Hornsby, Harvey C.
• Assistant Examiner(s): Brinson, Patrick F.
• Application Number:
  US07/501,992
• Time in Patent Office: 1,594 Days
• Field of Search: 15/167.1, 15/110, 15/DIG. 5, 15/106, 15/159.1
• US Class Current: 15/167.1
• CPC Class Codes: A46B 2200/1066 Toothbrush for cleaning the teeth or dentures A61C17/16 takes precedence; bristles arrangements for toothbrushes A46B9/04
• CPC Class Codes: A46B 9/04 Arranged like in or for toothbrushes
• CPC Class Codes: Y10S 15/05 Varied length bristle

Abstract

A toothbrush whose tufts comprise three distinct kinds of rows, with each row oriented transversely to the longitudinal axis of the head. The tufts of the first kind are the shortest. The endmost tufts on each row of the second kind tilt laterally outwardly by about 12 degrees. The tufts of the third kind are nearest the end of the head farthest from the handle and diverge from each other, with each tuft thereof tilting laterally at an angle of about 30 degrees and forwardly at about 14 degrees. In a first embodiment, each row of the first kind comprises a single, wide tuft. In a second embodiment, each row of the first kind has a plurality of laterally spaced round tufts. In a third embodiment, each row of the first kind comprises a plurality of laterally spaced rectangular tufts. All of the tufts may also be considered as defining four functional groups of tufts, with each of these four groups performing a specific function during brushing. The arrangement and orientation of the tufts yields a uniform cleaning action substantially independent of brushing direction or technique.

Claims

1. A toothbrush head and a handle, the head having a surface, the head having a longitudinal axis and terminating in a free end remote from said handle, tufts of bristles extending generally upwardly from said surface, the tufts arranged in three group of rows wherein each row of said three groups is transverse to said longitudinal axis and is longitudinally spaced from next adjacent rows, the tufts of each row of the first group being shorter in height than those of the other rows, the tufts in each row of the second group so arranged that the endmost tuft in each row thereof tilts laterally outwardly toward a respective side of said head and the remaining tufts of each row of said second group extend substantially perpendicularly to said head surface, some of said first and second groups alternating with each other along the longitudinal axis of the head, said third group of tufts located nearest said head free end and including two tufts each tilting laterally outwardly toward a respective side of said head.

2. The toothbrush head of claim 1 wherein the tufts of said second and third groups are of the same height as measured vertically.

3. The toothbrush head of claim 1 wherein two rows of tufts of said second group are positioned next to each other and are located between said third group and that row of said first group which is nearest to said head free end.

4. The toothbrush of claim 1 wherein each tuft of said third group of tufts tilts laterally about 30 degrees from the vertical.

5. The toothbrush head of claim 1 wherein a row of said second group of tufts is nearer to said handle than any other row of any group.

6. The toothbrush head of claim 1 wherein each of the endmost tufts of said second group of tufts tilts laterally at about 12 degrees to the vertical.

7. The toothbrush head of claim 1 wherein each row of said first group of tufts comprises a single tuft of a width substantially spanning the width of said head.

8. The toothbrush head of claim 1 wherein each row of said first group of tufts comprises a plurality of tufts substantially spanning the width of said head.

9. The toothbrush head of claim 8 wherein each tuft in said first group is round.

10. The toothbrush head of claim 8 wherein each tuft in said first group is rectangular.

11. The toothbrush head of claim 10 wherein the shorter dimension of each rectangular tuft is transverse to said longitudinal axis.

21. The toothbrush of claim 1 wherein each of said two tufts of said third group of tufts is on a respective opposite side of said longitudinal axis.

22. The toothbrush of claim 1 wherein each of said two tufts of said third group of tufts tilts forwardly away from said handle at about 14 degrees to the vertical.

23. The toothbrush of claim 1 wherein the bristles of said tufts of said first group are all of the same height.

24. The toothbrush of claim 4 wherein each tuft of said third group of tufts also tilts forwardly at about 14 degrees to the vertical.

12. A toothbrush head having a longitudinal axis and terminating in a free end, the head having a surface from which tufts of bristles extend generally upwardly, the tufts defining (1) a bristle bar group of tufts for cleaning the broad surfaces of the teeth, said bristle bar group defined by longitudinally spaced rows of densely packed bristles with each row extending across a portion of the width of the head, and located substantially medially of the head, (2) an interproximal group of spaced apart bristle tufts for cleaning crevices between teeth and defined by longitudinally spaced rows having laterally spaced tufts and located substantially medially of the head (3) a gumline bristle group of laterally spaced apart tufts for cleaning teeth at the gumline defined by a plurality of tufts substantially around the head periphery, each said gumline tuft tilting laterally outwardly (4) a leading tip group having spaced apart tufts for cleaning the teeth at the back of the mouth, said latter group including two tufts which tile laterally and which are located nearest the free end of the head.

13. The toothbrush head of claim 12 wherein each bristle bar tuft is defined by a single tuft.

14. The toothbrush head of claim 12 wherein each bristle bar tuft is defined by closely spaced tufts.

15. The toothbrush head of claim 12 wherein said interproximal tufts and said gumline tufts are in the same rows, said rows being transverse to said longitudinal axis.

16. The toothbrush head of claim 12 wherein most of said bristle bar tufts and said interproximal tufts alternate along the longitudinal axis of the head.

17. The toothbrush head of claim 12 wherein two rows of said interproximal tufts, transverse to said longitudinal axis, are next adjacent along the longitudinal axis of the head.

18. The toothbrush of claim 12 wherein said leading tip tufts are in a single row, transverse to said longitudinal axis, said row being most remote from the handle.

19. The toothbrush head of claim 14 wherein each tuft is rectangular, with the shorter dimension of each tuft being transverse to said longitudinal axis.

20. The toothbrush head of claim 14 wherein each tuft is rectangular, with the shorter dimension of each tuft being parallel to said longitudinal axis.