Tooth brush has parallel gear units between brush head and shaft to drive brush head in opposite directions; gear units alternately convert shaft rotation into brush head rotation

摘要

The device has a handle and a shaft with a brush at its free end rotatable about an axis approximately perpendicular to the shaft and a device with a drive and a shaft for oscillating the brush about the rotation axis; the drive drives the shaft continuously. Parallel gear units between the brush head and the shaft drive the brush head in opposite directions; the gear units alternately convert shaft rotation into brush head rotation. The device has a handle and a shaft with a brush at its free end rotatable about an axis approximately perpendicular to the shaft and a device with a drive and a shaft for moving the brush in an oscillatory motion about the rotation axis; the drive drives the shaft continuously. Parallel gear units (12, 17; 13,17) are arranged between the brush head (5) and the shaft (11) to drive the brush head in opposite directions; the gear units alternately convert shaft rotation into brush head rotation.