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An electric toothbrush is provided with an electric motor and a driving mechanism. The driving mechanism includes a motion translation means to convert rotary motion to oscillatory movement of a drive shaft adapted to be received on the brush head portion of the electric toothbrush, so as to impart

An electric toothbrush is provided with an electric motor and a driving mechanism. The driving mechanism includes a motion translation means to convert rotary motion to oscillatory movement of a drive shaft adapted to be received on the brush head portion of the electric toothbrush, so as to impart an oscillatory movement of the head portion about its longitudinal axis. A particular driving mechanism includes a flywheel having a drive pin which is received in a cam block secured to the drive shaft. The brush head portion comprises a pair of opposed bristle head portions arranged so as to present two groups of opposed bundles of bristles disposed substantially perpendicularly each to the other. Each of the groups of bundles of bristles comprises a plurality of rows and a plurality of columns of bristle bundles, where the rows aligned parallel to the longitudinal axis of the brush head portion, and the columns are aligned perpendicular to the longitudinal axis of the brush head portion. The bristles in each bundle in each row of bristle bundles are substantially equal in length, and the lengths of the bristles in each row of bristle bundles on each bristle head portion are progressively longer in each successive row of bristle bundles which is further away from the longitudinal axis of the brush head portion than an adjacent row of bristle bundles which is closer to the longitudinal axis of the brush head portion. The outer ends of the respective row of bristle bundles on each bristle head portion which is closest to the longitudinal axis of the brush head portion are spaced less than 0.100 inch from the outer ends of the respective opposed row of bristle bundles on the other bristle head portion.

대표청구항 ▼

1. An electric toothbrush comprising a power handle portion and a brush head portion;said power handle portion being adapted to provide a housing for an electric motor and for a driving mechanism located at a first end of said power handle portion; said driving mechanism being powered by said electr

1. An electric toothbrush comprising a power handle portion and a brush head portion;said power handle portion being adapted to provide a housing for an electric motor and for a driving mechanism located at a first end of said power handle portion; said driving mechanism being powered by said electric motor, said electric motor having a longitudinal axis; said brush head portion having a longitudinal axis which is offset by a first offset distance with respect to the longitudinal axis of said electric motor; said brush head portion being removably attachable at a first end thereof to said first end of said power handle portion; said brush head portion comprising a pair of opposed bristle head portions arranged so as to present two groups of opposed bundles of bristles disposed substantially perpendicularly each to the other; each of said groups of bundles of bristles on each respective bristle head portion comprising a plurality of rows and a plurality of columns of bristle bundles; said driving mechanism comprising motion translation means for translating rotational driving power from said electric motor to oscillatory motion delivered to said brush head portion; wherein said driving mechanism further comprises a drive shaft disposed on said longitudinal axis of said brush head portion, and being adapted to deliver oscillatory driving power from said motion translation means to said brush head portion; said drive shaft being detachably connected to said brush head portion in a manner so as to preclude rotational slippage therebetween, and so as to secure said drive shaft in position along said longitudinal axis thereof; whereby rotational motion of said electric motor is translated by said motion translation means into oscillatory motion of said drive shaft, so as to provide oscillatory movement to said pair of opposed bristle head portions of said brush head.