A dental cleaning appliance includes a handle and a fluid delivery system. The fluid delivery system includes a nozzle for delivering a burst of working fluid to the teeth of a user. The nozzle moves relative to the handle as the appliance is moved along the teeth of the user. A sensor provides an output which varies with movement of nozzle relative to the handle. A control circuit actuates the delivery of working fluid to the teeth of the user depending on the output from the sensor. The control circuit is configured to adjust a parameter of the delivery to the teeth of the user, such as the volume of working fluid within a delivery, depending on the variation with time of the output from the sensor.

A dental cleaning appliance includes a handle and a fluid delivery system. The fluid delivery system includes a nozzle for delivering a burst of working fluid to the teeth of a user. A contact member for engaging the teeth of the user is moveable relative to the nozzle as the appliance is moved along the teeth of the user. A sensor provides an output which varies with movement of contact member relative to the nozzle. A control circuit actuates the delivery of working fluid to the teeth of the user depending on the output from the sensor.

A device for brushing teeth having multiple brushes that provide rotary and/or oscillating motion. The device has a right lateral brush, a left lateral brush, and an upper brush. Each of the three brushes is connected to, and driven by, a respective supporting rod. Each of the supporting rods is driven by a respective gear. The device includes a motor or engine for generating rotational movement which is transferred to each of the gears by a transmission. The transmission is configured to simultaneously provide both rotary and lateral movement to the brushes, thereby creating an oscillating motion.

An electric toothbrush comprises a brush head, a motor for providing oscillating rotation, and a multi-directional movement mechanism connected to the brush head to offer a plurality of movements. The movement mechanism includes a first mechanism for converting the motor's rotation into an oscillating rotation, a second mechanism for an oscillating side-to-side movement, and a third mechanism for an oscillating back-and-forth movement. Additionally, a gear system is employed, featuring a main gear with arc teeth on its outer perimeter and a set of equally spaced driven gears. The main gear engages with the driven gears individually, each configured to provide one of the plurality of movements. A control system facilitates the selection of movements and on/off functionality, while a power system supplies necessary power. Encased within an ergonomic waterproof shell, the electric toothbrush ensures protection and comfortable handling.

An electrically driven device includes a housing, an electric motor with a drive shaft having a first rotary axis and a drive pin eccentrically connected to the drive shaft, and a driven shaft having a second rotary axis and mounted in the housing for a pivoting movement. The driven shaft is coupled to the drive pin by a gear mechanism converting a rotary motion of the drive shaft into the reciprocating pivoting of the driven shaft. The gear mechanism has first and second transmission stages, the former including a cross slider, and the latter an elastically deformable transmission member. The cross slider has a sliding support extending perpendicular to the first rotary axis and receiving the drive pin. The cross slider is axially guided in the housing to move in an axial direction perpendicular to the first rotary axis and perpendicular to the extension of the sliding support. A link, offset relative to the second rotary axis, connects the cross slider to the elastically deformable transmission member.

An electrically driven device includes an electric motor with a drive shaft having a first rotary axis and a drive pin eccentrically thereto, and a driven shaft having a second rotary axis and mounted for pivoting motion. The driven shaft is coupled to the drive shaft by a scotch yoke mechanism, converting a rotary motion of the drive shaft into a reciprocating pivoting motion of the driven shaft. The scotch yoke mechanism includes a cross slider having a sliding support extending perpendicular to the first rotary axis and receiving the drive pin either directly or by a sliding block having a bearing receiving the pin. The cross slider is axially guided to move in an axial direction perpendicular to the first rotary axis and to the extension of the sliding support. The driven shaft is coupled to the cross slider by a pivotable crank arm, thereby converting a rotary motion of the drive shaft into a reciprocating motion of the driven shaft.

A power toothbrush device (100) including a brush head member (104) having bristles and a drivetrain assembly (400, 800) having a drivetrain shaft (124, 824) configured to drive the brush head member. The drivetrain assembly includes a resonator (410, 810) configured to rotate about a central axis (A) to move the bristles in a first movement pattern; a resilient member (420, 820); a magnet (700A, 700B, 830A, 830B) connected with the resonator; and a conductor (710A, 710B, 840A, 840B). As the resonator rotates and the magnet moves toward the conductor in a first direction, a force is generated upon the magnet in a second direction that is opposite the first direction, and the force generated upon the magnet thereby causes a rotation of the resilient member about a second axis that is different than the central axis.

A power toothbrush device (100) including a brush head member (104) having a set of bristles (116); a body portion (102) coupled with the brush head member; and a drivetrain assembly (122). The drivetrain assembly includes an actuator (840) configured to generate periodic linear movement and a drivetrain shaft (124, 824) configured to transmit the generated periodic linear movement to the brush head member. The set of bristles are configured to be driven in a first direction (TM) at an amplitude equal to or greater than 0.25 mm and less than 3 mm and a frequency equal to or greater than 0.25 Hz and less than 520 Hz in the first direction. The drivetrain shaft is further configured to periodically rotate the set of bristles in a second direction (SM) about a central axis of the power toothbrush device.

Disclosed herein is a bidirectional magnetic levitation brush motor device, including a motor housing, a motor shaft and an end cover, wherein the end cover is arranged at a bottom end of the motor housing, shaft holes are formed in axes of the motor housing and the end cover, the motor shaft is arranged between the two shaft holes, bearings are arranged at junctions of the motor shaft with the motor housing and the end cover, the end of the motor shaft that is away from the end cover extends out of the motor housing, and a transmission connection shaft is arranged at a top end of the motor shaft. With regard to the present invention, movement transmission is achieved by means of an electromagnetic effect, and mounting of elastic structures such as a torsion bar and the like is no longer needed.

A personal care device including a body portion; a cleaning unit having a set of cleaning elements, the set of cleaning elements extending in an axis of alignment; a controller and an actuator assembly arranged to be driven by the controller. The actuator assembly includes an actuator configured to generate first and second periodic movements, wherein the first and second periodic movements operate at different frequencies or out-of-phase with each other. The first periodic movement causes the cleaning elements to move in a first direction about a central axis of the personal care device or along a line that is tangential to a platen of the cleaning unit. The second periodic movement causes the cleaning elements to move in a second direction that is different than the first direction, wherein the second direction is normal to the platen of the cleaning unit.