Patent ID: 7788756
Filing Date: 2010-09-07
Classification: A46B,A61C,Y10S

Abstract:
1. A brush part for an electric toothbrush which includes a bristle holder mounted for rotary motion about a rotation axis, a plurality of first tufts projecting from a surface of the bristle holder and having their bases arranged in a polygon around the rotation axis and leaning outwardly away from the rotation axis at an acute angle so that their distal end is further out from the rotation axis than their base, and a plurality of second tufts projecting from a surface of the bristle holder and which have their bases further radially out from the rotation axis than the bases of the first tufts and having their bases arranged in a polygon around the rotation axis, wherein the second tufts either: are aligned parallel to the rotation axis, or; lean inwardly at an acute angle relative to the rotation axis toward the rotation axis so that their distal ends are at less distance radially from the rotation axis than their base, or; lean outwardly at an acute angle relative to the rotation axis and away from the rotation axis so that their distal end is further out from the rotation axis than their base, but at a lesser angle of lean relative to the rotation axis than the first tufts, and wherein the distal ends of the first tufts are at a further radial distance from the rotation axis than the distal ends of the second tufts.