Personal hygiene device

US11793619B2 · kind B2 · utility

Assignee

• The Braun Corporation · DE

Inventors

• Norbert Schaefer · Frankfurt am Main, DE
• Uwe Schober · Königstein, DE
• Robert Schäfer · Frankfurt, DE
• Matthias Paschold · Wolmirstedt, DE
• Tobias Schwarz · Blaustein, DE

Key dates

• Filing date: May 1, 2020
• Grant date: Oct 24, 2023
• Expiry date: Oct 5, 2041

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A46B2200/1066
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A personal hygiene device has a drive unit having a support, a stator fixedly mounted at the support, and an armature spring-mounted at the support for driven linear oscillating motion along a first longitudinal direction parallel to or coinciding with an x-axis of an x-y-z coordinate system. The armature has a center of gravity located in rest at a coordinate [xa, ya, za], and a drive shaft fixedly coupled with the armature and having a center of gravity located in rest at a coordinate [xd, yd, zd]. A first treatment head assembly, detachably connected to the drive shaft, has a center of gravity located in rest at a coordinate [xt1, yt1, zt1]. A secondary mass element, spring-mounted at the support for essentially linear oscillating motion along the first longitudinal direction, has a center of gravity located in rest at a coordinate [xm, ym, zm]. At least the coordinate [xa, ya, za] of the center of gravity of the armature has an offset in at least one of the y-direction and z-direction with respect to the coordinate [xd, yd, zd] of the center of gravity of the drive-shaft or with respect to the coordinate [xt1, yt1, zt1] of the center of gravity of the first treatment head assem…