Electric toothbrush

Abstract

An electric toothbrush has a first brush that oscillates and a second brush that oscillates opposite the first brush. The electric toothbrush also has a shaft assembly that includes a moveable pin that creates an oscillating motion of a first brush on a head of the toothbrush. The method of assembly inserts a shaft assembly of the toothbrush through a bottom hole of an elongated hollow body of the toothbrush head to come in contact with a top hole of the elongated body.

1 . An electric toothbrush comprising: 
 a handle having a motor disposed therein;    a head joined to the handle;    a first brush pivotally mounted to the head having a generally circular first bristle holder with a first outer circumference;    a second brush pivotally mounted to the head having a generally circular second bristle holder with a second outer circumference;    the first brush interconnected to the second brush;    a rotatable assembly connected to the motor and the first brush;    a switch operably connected to the motor, wherein said switch is actuated to engage the motor thereby causing the assembly to turn, the first brush to rotate in a first direction, and the second brush to rotate in a second direction opposite the first direction.    
   
   
       2 . The electric toothbrush of  claim 1  further comprising a first toothed section upon the first outer circumference, a second toothed section upon the second outer circumference, wherein the first brush is interconnected to the second brush by reciprocally joining the first and second toothed sections.  
   
   
       3 . The electric toothbrush of  claim 2  wherein the toothed sections are on a portion of the outer circumference.  
   
   
       4 . The electric toothbrush of  claim 1  wherein the first brush is interior of the second brush.  
   
   
       5 . The electric toothbrush of  claim 1  wherein the first brush is larger than the second brush.  
   
   
       6 . The electric toothbrush of  claim 1  further comprising a pin radially offset from an assembly longitudinal axis, a rectangular slot upon the first bristle holder that extends radially inward from the first outer circumference, wherein the pin engages the rectangular slot throughout rotational movement of the pin causing the first brush to oscillate.  
   
   
       7 . An electric toothbrush comprising: 
 a handle having a motor disposed therein;    a head joined to the handle, the head having a pivotally mounted bristle holder with a plurality of tufts;    a rotatable assembly having a longitudinal axis and operably connected to the motor, the assembly extending from the handle to the head;    the assembly having a shaft and cylindrical cap;    the cylindrical cap having a pin radially offset from the longitudinal axis;    the bristle holder having a slot extending radially inward from the outer circumference to engage the pin of the cylindrical cap;    a switch operably connected to the motor, wherein said switch is actuated to engage the motor thereby causing the bristle holder to oscillate.    
   
   
       8 . The electric toothbrush of  claim 7  wherein the pin extends from the cap and ends in a spherically member.  
   
   
       9 . The electric toothbrush of  claim 7  wherein the bristle holder is generally circular.  
   
   
       10 . The electric toothbrush of  claim 7  wherein the rotatable shaft is made of a polymeric material.  
   
   
       11 . The electric toothbrush of  claim 7  wherein the cylindrical cap is metal.  
   
   
       12 . The electric toothbrush of  claim 6  wherein the pin has a longitudinal axis approximately parallel the shaft longitudinal axis.  
   
   
       13 . The electric toothbrush of  claim 7  further comprising a bushing between the rotatable shaft and the cylindrical cap, the bushing engaging the head but permitting rotation of the cylindrical cap.  
   
   
       14 . The electric toothbrush of  claim 7  further comprising a gasket between the bushing and the cylindrical cap.  
   
   
       15 . An electric toothbrush comprising: 
 a handle at a first end of the toothbrush having a motor disposed therein;    a head at a second end of the toothbrush, the head having pivotally mounted interior and exterior bristle holders each with a plurality of tufts;    the interior bristle holder being generally circular with a first outer circumference and a first toothed section upon the first outer circumference;    the exterior bristle holder being generally circular with a second outer circumference and a second toothed section upon the second outer circumference;    the interior bristle holder interconnected to the exterior bristle holder by reciprocally joining the first and second toothed sections;    a rotatable assembly having a longitudinal axis operably connected to the motor, the assembly extending from the handle to the head;    the assembly ending in a member radially offset from the longitudinal axis;    the interior bristle holder having a rectangular slot extending radially inward from the first outer circumference to engage the pin throughout rotational movement of the pin;    a switch operably connected to the motor, wherein said switch is actuated to engage the motor thereby causing the interior bristle holder to rotate in a first direction and the exterior bristle holder to rotate in an opposite second direction.    
   
   
       16 . The electric toothbrush of  claim 15  wherein the rectangular slot is approximately centered upon the first toothed section.  
   
   
       17 . The electric toothbrush of  claim 15  wherein the first outer circumference is larger than the second outer circumference.  
   
   
       18 . A method of assembling a toothbrush including: 
 providing a toothbrush comprising: 
 (a) a handle having a motor disposed within, a motor shaft extending from the motor;  
 (b) a head having at least one brush pivotally attached and an elongated hollow body adjacent the brush with a bottom opening and a top opening;  
 (c) a shaft assembly having a shaft and cylindrical cap;  
 (d) the shaft having a first end for matingly engaging the motor shaft and a second end;  
 (e) a cylindrical cap having a rod extending from one end and a pin on an opposite end;  
 (f) a bushing for placement upon the rod;  
   fitting the bushing upon the rod and the rod within the shaft second end;    placing the shaft assembly within the elongated hollow body entering from the bottom opening, engaging the bushing against the top opening, and coupling the pin to the brush;    connecting the rotatable assembly shaft first end to the motor shaft.