Complex motion toothbrush

Abstract

An electrically driven toothbrush has a rotatable shaft with a remote cam, which fits into a slot in a bristle holder. The holder is mounted for rotation in a toothbrush head. When the shaft rotates the remote end describes a circle and drivingly engages the slot to cause the holder to vibrate in a first brushing motion. A second bristle holder is driven by the first bristle holder, for a complimentary brushing motion. The second bristle holder is driven through and engagement with a pin or cam extending from the first bristle holder.

1 . An electrically driven toothbrush comprising: 
 a handle at a first end of the toothbrush;    a head at a second end of the toothbrush;    a rotatable shaft extending from the handle to the head and having a first longitudinal central axis;    a first bristle holder mounted with a first pivot or hinge to the head and associated with a remote end of the shaft, the remote end of the shaft being received in a slot of the first bristle holder for driving the first bristle holder in an oscillating movement; and,    a second bristle holder movably mounted to the head and drivingly engaged by a rigidly mounted portion of the first bristle holder.    
   
   
       2 . The electric toothbrush of  claim 1  wherein the second bristle holder includes a cam follower portion extending from a surface thereof, and wherein the rigidly mounted portion of the first bristle holder includes a cam, the cam being operative to engage the cam follower, the electric toothbrush further comprising a resilient member operative to bias second bristle holder toward the first bristle holder.  
   
   
       3 . An electric toothbrush comprising: 
 a shaft, the shaft including a cam at a remote portion of the shaft;    a motor operative to rotate the shaft;    a first brush section operatively coupled to the cam for being driven in a first motion; and,    a second brush section longitudinally separated from the first brush section and driven in a second motion by a rigid element of the first brush section.    
   
   
       4 . The electric toothbrush of  claim 3  wherein the brush section includes a cam follower portion extending from a surface thereof, and wherein the rigidly mounted portion of the first brush section includes a cam, the cam being operative to engage the cam follower, the electric toothbrush further comprising a resilient member operative to bias the second brush section toward the first brush section, whereby as the motor rotates the shaft the first brush section is driven in an oscillatory manner causing the cam to cyclically engage the cam follower thereby driving the second brush section longitudinally away from the first brush section, and to cyclically disengage from the cam follower thereby allowing the resilient member to urge the second brush section back toward the first brush section.