Brush section for an electric toothbrush
View Patent ↗A brush section for use with an electric toothbrush includes a relatively large brush head portion having a generally rectangular shape, although oblong, elliptical and other such shapes having a length to width aspect ration greater than 1 may be employed. The brush head portion is secured to a shaft portion of the brush section that may be configured to couple to a handle section. The handle section may include an electric drive including drive shaft, and the drive shaft may couple to the brush head via a coupling member positioned within the shaft portion. The electric drive may impart a rotary, oscillating rotary-oscillating or other suitable drive motion to the drive shaft that is, in turn, imparted upon the brush head by virtue of the coupling member.
1. A cleaning section for an electrical toothbrush with a handle section, having a motor and a drive shaft, the cleaning section comprising:
a movable bristle holder structured to receive a drive motion from the motor via a drive mechanism comprising a drive shaft having a longitudinal axis, the drive shaft being structured to oscillate around its longitudinal axis thereby imparting rotation or oscillation to the movable bristle holder;
a head including a first plurality of cleaning bristles having a first height and arranged in a static bristle field which in use is static relative to the handle section and a second plurality of cleaning bristles having a second height different from the first height, wherein the second plurality of cleaning bristles are supported within the movable bristle holder; and
an end extension portion including a third plurality of cleaning bristles, the end extension portion being coupled to the movable bristle holder and wherein the third plurality of cleaning bristles are angled relative to the first and second plurality of cleaning bristles;
wherein the movable bristle holder is movable with respect to the head and the static bristle field such that a cleaning motion of the second and third plurality of cleaning bristles includes a back and forth oscillating movement of the second and third plurality of cleaning bristles relative to the first plurality of cleaning bristles.
2. The cleaning section of claim 1 , wherein the first plurality of cleaning bristles are arranged in rows generally transverse to the longitudinal axis.
3. The cleaning section of claim 1 , wherein the first plurality of cleaning bristles and the second plurality of cleaning bristles are arranged in rows generally transverse to the longitudinal axis, the rows of the first plurality of cleaning bristles and the rows of the second plurality of cleaning bristles being interleaved.
4. The cleaning section of claim 1 , wherein the first plurality of cleaning bristles and the second plurality of cleaning bristles are arranged in rows generally transverse to the longitudinal axis, the rows being alternate rows of the first plurality of cleaning bristles and the second plurality of cleaning bristles such that at least some of the rows of the second plurality of cleaning bristles are disposed between the rows of the first plurality of cleaning bristles, and at least some of the rows of the first plurality of cleaning bristles are disposed between the rows of the second plurality of cleaning bristles.
5. The cleaning section of claim 1 , wherein the first plurality of cleaning bristles and the second plurality of cleaning bristles are arranged in rows generally transverse to the longitudinal axis, wherein every second row is a row of the first plurality of cleaning bristles.
6. The cleaning section of claim 1 , wherein the cleaning motion comprises a reciprocating oscillation.
7. The cleaning section of claim 1 , wherein the cleaning motion comprises a rotational and translational motion of the second plurality of cleaning bristles.
8. The cleaning section of claim 1 , wherein the cleaning motion comprises oscillation of the second plurality of cleaning bristles about the longitudinal axis at a full oscillation angle of from approximately 40 degrees to approximately 60 degrees.
9. The cleaning section of claim 8 , wherein the full oscillation angle is about 44 degrees.
10. The cleaning section of claim 8 , wherein the full oscillation angle is about 55 degrees.
11. The cleaning section of claim 1 , wherein the cleaning motion comprises an oscillation of the second plurality of cleaning bristles at a frequency of from about 80 Hz to about 120 Hz.
12. An electric toothbrush comprising:
a handle section including a motor, the handle section being coupled with a cleaning section, the cleaning section comprising a movable bristle holder structured to receive a drive motion from the motor via a drive mechanism comprising a drive shaft having a longitudinal axis, the drive shaft being structured to oscillate around its longitudinal axis;
a head including a first plurality of cleaning bristles having a first height and arranged in a static bristle field which in use is static relative to the handle section and a second plurality of cleaning bristles having a second height different from the first height, wherein the second plurality of cleaning bristles are supported within the movable bristle holder; and
an end extension portion including a third plurality of cleaning bristles, the end extension portion being coupled to the movable bristle holder and wherein the third plurality of cleaning bristles are angled relative to the first and second plurality of cleaning bristles;
wherein the movable bristle holder is movable with respect to the head and the static bristle field such that a cleaning motion of the second and third plurality of cleaning bristles includes a back and forth oscillating movement of the second and third plurality of cleaning bristles relative to the first plurality of cleaning bristles.