Patent ID: 9204948
Filing Date: 2015-12-08
Classification: A46B,A61C

Abstract:
1. A brushhead assembly for a power toothbrush, wherein the brushhead assembly can be removed from and inserted onto a handle portion of the toothbrush, the handle portion including a drive shaft extending therefrom having a wedge-shaped free end and a peripheral circumferential recess in an external surface thereof to receive a portion of a helical coil spring member having the form of a circle, the brushhead comprising: a brush member for cleaning teeth, mounted on a distal end of an extending neck portion, the neck portion being hollow over a portion of its length from a proximal end thereof to receive the drive shaft from the handle portion, wherein the neck portion includes a peripheral circumferential recess in an internal surface of the hollow portion thereof, which is in registry with the recess in the drive shaft when the brushhead assembly is operatively positioned on the handle, into which recesses the helical coil spring member having the form of a circle is received, to provide reliable axial retention of the brushhead assembly on the drive shaft, and wherein the hollow portion of the neck at an upper end of the hollow portion includes a mating wedge-shaped recess to cooperatively receive the wedge-shaped end of the drive shaft in a sufficiently tight relationship to provide efficient torque transfer between the drive shaft and the brushhead assembly.