Nodal mounted system for driving an output tool

Details Nodal mounted system for driving an output tool Nodal mounted system for driving an output tool

A - Human Necessities

61

C

A61C 17/34 (2006.01) A61C 17/22 (2006.01) A61C 17/32 (2006.01)

Patent

CA 2490369

The power toothbrush, which has a rotating brushhead movement, includes a housing with a motor mounted therein having an armature which in operation rotates through an arc of predetermined magnitude. The toothbrush also includes a brushhead mounted on a shaft which is connected to an output mass. A spring assembly couples the armature to the output mass, the spring assembly including two spring portions with a node point therebetween, wherein when the armature rotates, the brushhead moves in an opposite direction. The frequency of the movement of the armature is set equal to the resonant frequency of the spring coupling system and the output assembly.

L'invention concerne une brosse à dents électrique comportant une tête de brossage à mouvement rotatif, ainsi qu'un corps dans lequel est installé un moteur comprenant un induit qui, en fonctionnement, est mis en rotation à travers un arc d'amplitude prédéterminée. La tête de brossage est montée sur un arbre qui est relié à une masse de sortie. Un ensemble à ressort couple l'induit à la masse de sortie, ledit ensemble à ressort comprenant deux parties de ressort séparées par un point nodal. Lorsque l'induit est mis en rotation, la tête de brossage tourne dans le sens inverse. La fréquence de mouvement de l'induit est égale à la fréquence de résonance du système de couplage à ressort et de l'ensemble de sortie.

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