Toothbrush

• US 4,729,142 A
• Filed: 03/31/1986
• Issued: 03/08/1988
• Est. Priority Date: 03/31/1986
• Status: Expired due to Term

• Current Assignee: Joseph, C., Iii, Los Angeles, Cox
• Original Assignee: Joseph C. Cox III
• Inventors: Yoshioka, Larry M.
• Primary Examiner(s): Feldman, Peter
• Application Number:
  US06/846,205
• Time in Patent Office: 708 Days
• Field of Search: 15/167 R, 15/167 A, 15/172, 15/176, 15/110, D 4/104-114, 128/62 A
• 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

Abstract

A toothbrush for improved execution of the modified Bass method of cleaning teeth comprises a handle having a bristle mounting and disposed at a negative angle relative to the principal axis of the handle. In a specific example, a substantially rectangular array of bristle tufts is mounted on the angled end of the handle, the bristle tufts comprising four columns forming eight rows, the columns being substantially equally spaced at the base and the rows being substantially equally spaced. A forward edge grouping of bristle tufts is provided comprising a row of three bristle tufts. The tufts have from 20 to 150 bristles and the bristles are from 5/16" to 9/16" in length. The two outer columns of bristle tufts are angled inwardly at 7° from the vertical and the two center columns of tufts are angled inwardly at 6° from the vertical, to provide greater firmness against the teeth when the handle is rotated than when the handle is reciprocated along the teeth. The two outer bristle tufts of the row of bristle tufts in the forward edge grouping can be angled inwardly at an angle of 6° to 7° from the vertical, the center bristle tuft being substantially vertical.

Claims

1. A toothbrush for improved execution of the modified Bass method of brushing teeth comprising:

a plurality of bristles in a substantially rectangular array of spaced columns on a handle, the bristles being mounted in multi-bristle tufts with substantially uniform spacings thereof in the array, the long direction of the array being parallel to the length of the handle, there being at least two substantially parallel columns of bristles disposed laterally on each side along the long direction to define at least inner and outer columns on each side, wherein the bristles terminate in a common plane to define a brushing surface and the outer and inner columns of bristles are angled inwardly at an angle of no greater than 16°

from the vertical, the width of the mass of bristles at the top being substantially less than at the base, such that the toothbrush bristles are firmer when rotated about the length of the handle against the teeth of a user than when brushed lengthwise against the teeth, and sufficiently dense to provide a cooperative flexure when subjected to compression.

2. The toothbrush as set forth in claim 1, wherein the bristle tufts comprise from 20 to 150 bristle ends each, the outer columns have an inclination of about 7°

and the inner columns have an inclination of about 6°

, and wherein the bristles are from 5/16" to 9/16" in length and about 0.007" in diameter.

3. The toothbrush as set forth in claim 2, comprising four columns of bristle tufts forming eight lateral parallel rows, and a forward edge grouping of bristle tufts.

4. The toothbrush as set forth in claim 3, said forward edge grouping of bristle tufts comprising a row of at least two bristle tufts substantially parallel to the other rows of bristle tufts, and angled inwardly at an angle no greater than 16°

from the vertical, and wherein there are approximately 66 bristles per tuft.

5. A toothbrush for improved execution of the modified Bass method of cleaning teeth by penetrating crevices such as the joinder between the gum and tooth, moving horizontally and then rotating away from the gum to dislodge matter, comprising:

a handle having a bristle mounting and disposed at a negative angle relative to the principal axis of the handle; and

a substantially rectangular array of bristle tufts mounted on the angled end of the handle, wherein the bristles terminate in a substantially common plane to define a brushing surface, the bristle tufts comprising four columns forming eight rows, the columns being substantially equally spaced at the base and the rows being substantially equally spaced at the base, and a forward edge grouping comprising a row of three bristle tufts, the tufts having approximately 46 bristles of 0.007" diameter each, and the bristles being approximately 7/16" long, the two outer columns of tufts being angled inwardly at 7°

from the vertical and the two center columns of tufts being angled inwardly at 6°

from the vertical.

6. The toothbrush as set forth in claim 5, the two outer bristle tufts in the row of the forward edge grouping being angled inwardly at an angle of 6°

to 7°

, from the vertical.

7. A toothbrush comprising:

a handle having a bristle mounting end; and

an array of columns and rows of bristle tufts mounted on the bristle mounting end of the handle, the bristles being from 5/16"-9/16" in height and from 0.003"-0.012" in diameter, with from 20-150 bristle ends per tuft, wherein the outer and inner columns are angled inwardly at from 2°

-16°

from the vertical to provide greater firmness against the teeth when the handle is rotated than when the handle is reciprocated along the teeth, and wherein the bristle tufts converge along the longitudinal center line of the brush to terminate in a substantially common plane and provide greater density and firmness adjacent the center line, while the lateral borders are less dense.

8. The toothbrush as set forth in claim 7, employing four equally spaced parallel columns of bristle tufts forming eight parallel rows, the rows being substantially equally spaced.

9. The toothbrush as set forth in claim 8, including a forward edge grouping comprising a row of three equally spaced bristle tufts, parallel to the other rows of bristle tufts.

10. The toothbrush as set forth in claim 9, the bristle tufts having approximately 46 bristle ends of 0.007" in diameter each and the bristles being approximately 7/16" long, the outer columns of tufts being angled inwardly at 7°

from the vertical and the two inner columns being angled inwardly at 6°

from the vertical.

11. The toothbrush as set forth in claim 10, the two outer bristle tufts of the row of bristle tufts in the forward edge grouping being angled inwardly at an angle of 6°

to 7°

from the vertical, and the center bristle tuft being substantially vertical.