Patent ID: 9003590
Filing Date: 2015-04-14
Classification: A61C,H02K,Y10T

Abstract:
1. An electric toothbrush having a handle section and an attachment section, the handle section comprising: a handle housing in which a drive unit is disposed; a first connector element extending from the handle housing being adapted for connection with an attachment section, the first connector element being coupled to a first drive of the drive unit; and a second connector element extending from the handle housing being adapted for connection with the attachment section, the second connector element being coupled to a second drive of the drive unit; wherein the first connector element linearly reciprocates relative to the handle housing during operation and the second connector element linearly reciprocates relative to the handle housing with a 180 degrees phase shift with respect to the first connector element; wherein the attachment section is coupled via a coupling to the first connector element and the second connector element, wherein the coupling is a detachable coupling; wherein the attachment section includes an attachment housing and a functional element, wherein the attachment housing is coupled to the first connector element such that the attachment housing linearly reciprocates together with the first connector element during operation, and the functional element is movably mounted at the attachment housing; wherein the functional element is mounted for oscillatory rotation around a rotation axis that is essentially perpendicular to a longitudinal axis along which the first connector element linearly reciprocates; whereby during operation the functional element simultaneously reciprocates in a direction of the longitudinal axis and oscillates around the rotation axis that is essentially perpendicular to a longitudinal axis; wherein the drive unit is a resonant drive and the first drive is a first moving part of the resonant drive and the second drive is a second moving part of the resonant drive; wherein the first and second moving parts are coupled to the handle housing and to each other by a spring arrangement; and wherein the average absolute velocity of the first connector element during operation lies in the range of between about 100 mm/s to about 240 mm/s.