Electric power driven toothbrush
First Claim
1. An elongated electric power driven toothbrush comprising a rotary toothbrush section coupled with an elongated drive shaft, said toothbrush further comprising a handle section, a driving mechanism, and an electric motor disposed in said handle section, wherein said driving mechanism comprises a crank, a connecting rod, and a rocker connected together as a four-bar linkage, said crank adapted to be driven by said electric motor said rocker being coupled to said drive shaft for oscillation therewith, said crank driving in an oscillatory manner at least indirectly said drive shaft of said toothbrush section through said connecting rod and said rocker, wherein said crank comprises an eccentric disk and said connecting rod includes a bearing eye receiving said eccentric disk in a rotatable relationship therethrough, said driving mechanism further comprising a spindle, a bearing block, and a bearing plate, said spindle extending through said eccentric disk and, on one side of said eccentric disk, being rotatably carried in said bearing block and, on an opposite side of said eccentric disk, being rotatably carried in said bearing plate.
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Accused Products
Abstract
The invention is directed to an electric power driven toothbrush having a four-bar linkage (8) disposed in the handle section, the input end thereof being driven by an electric motor (2) through a train of spur gears, while the output end thereof drives in an oscillatory manner an output shaft (15) within an angular range of ±35°, approximately. The output shaft (15) is suitable for coupling engagement with a toothbrush section through a bevel gear train, and the axis of rotation of the toothbrush section forms an approximately right angle with the axis of the output shaft (15).
115 Citations
15 Claims
- 1. An elongated electric power driven toothbrush comprising a rotary toothbrush section coupled with an elongated drive shaft, said toothbrush further comprising a handle section, a driving mechanism, and an electric motor disposed in said handle section, wherein said driving mechanism comprises a crank, a connecting rod, and a rocker connected together as a four-bar linkage, said crank adapted to be driven by said electric motor said rocker being coupled to said drive shaft for oscillation therewith, said crank driving in an oscillatory manner at least indirectly said drive shaft of said toothbrush section through said connecting rod and said rocker, wherein said crank comprises an eccentric disk and said connecting rod includes a bearing eye receiving said eccentric disk in a rotatable relationship therethrough, said driving mechanism further comprising a spindle, a bearing block, and a bearing plate, said spindle extending through said eccentric disk and, on one side of said eccentric disk, being rotatably carried in said bearing block and, on an opposite side of said eccentric disk, being rotatably carried in said bearing plate.
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11. An electric power driven toothbrush comprising a handle section, a rotary toothbrush section mounted for rotation and coupled with an elongated drive shaft, a driving mechanism, an electric motor disposed in said handle section and driving, through said driving mechanism in an oscillatory manner, said rotary toothbrush section at a frequency of between 30 Hz and 60 Hz, said driving mechanism comprises an eccentric disk, a connecting rod and a rocker connected together as a four-bar linkage assembly, said rocker being coupled to said drive shaft for oscillation therewith, said eccentric disk adapted to be driven by said electric motor, said eccentric disk driving in an oscillatory manner at least indirectly said drive shaft of said toothbrush section by a means of said connecting rod and rocker, said connecting rod including a bearing eye receiving said eccentric disk in a rotatable relationship, a spindle extending through said eccentric disk, a bearing block and a bearing plate located on opposite sides of said eccentric disk from each other and each rotatably carrying said spindle, a train of gears on said spindle in driving engagement with said eccentric disk, said train of gears comprising a pinion mounted on the output shaft of said electric motor and an internal gear on said spindle, an axis of rotation of said rotary toothbrush section forming an angle of about 90°
- with said drive shaft, and an angular driving mechanism for coupling said drive shaft in driving engagement with said toothbrush section.
- View Dependent Claims (12, 13, 14)
Specification