Electrically driven device

Patent metadata

Field	Value
Publication number	US-12128573-B2
Application number	US-202117361550-A
Country	US
Kind code	B2
Filing date	Jun 29, 2021
Priority date	Jul 1, 2020
Publication date	Oct 29, 2024
Grant date	Oct 29, 2024

Abstract

The invention relates to an electrically driven device, for example an electric hair removal device, such as a wet or dry shaver, an electric toothbrush or an electric skin treatment device. The electrically driven device comprises a housing having a chassis, wherein the chassis comprises an electric motor having a first drive shaft, a battery unit, and an oscillating body having a second drive shaft. A first longitudinal axis is defined arranged along the second drive shaft, a second longitudinal axis is defined arranged along the first drive shaft, and a third longitudinal axis is defined arranged through the center of the body of the battery unit, wherein the second longitudinal axis and/or the third longitudinal axis are parallel offset to the first longitudinal axis.

First claim

What is claimed is:

1. An electrically driven device comprising a housing and a chassis, wherein the chassis comprises a plastic skeleton for receiving an electric motor having a first drive shaft, a battery unit, a printed circuit board (PCB) and an oscillating body having a second drive shaft to drive a cutter unit upon movement of the oscillating body, wherein a first longitudinal axis is defined along the second drive shaft, wherein a second longitudinal axis is defined along the first drive shaft with the second longitudinal axis passing through the oscillating body, and a third longitudinal axis is defined through a center of a body of the battery unit, the second longitudinal axis and the third longitudinal axis are parallel and offset to the first longitudinal axis and the second longitudinal axis is offset from the third longitudinal axis, wherein the oscillating body has a corner section and the second drive shaft is located in the corner section, wherein the second drive shaft extends from a side of the oscillating body nearest to the cutter unit and opposite to a side of the oscillating body nearest to the electric motor, wherein the electric motor comprises a drive pin rotatable eccentrically about the second longitudinal axis, wherein the oscillating body comprises an elongated hole for receiving the drive pin, the elongated hole having a smaller widening in a direction of oscillation of the oscillating body.

2. The electrically driven device according to claim 1 , wherein the second longitudinal axis and the first longitudinal axis and the third longitudinal axis and the first longitudinal axis are offset by a different offset distance.

3. The electrically driven device according to claim 1 , wherein the second longitudinal axis and the third longitudinal axis are offset from the first longitudinal axis in opposite transverse directions.

4. The electrically driven device according to claim 1 , wherein the housing and the chassis comprise at least two components.

5. The electrically driven device according to claim 4 , wherein the at least two components comprise a soft and a hard component.

6. The electrically driven device according to claim 1 , wherein the skeleton of the chassis comprises at least an upper wall, a lower wall, a rear wall and a front wall, wherein the front or the rear wall comprise openings or cavities for receiving the battery unit and the electric motor and wherein the printed circuit board (PCB) is fixed at a lateral side of the chassis.

7. The electrically driven device according to claim 1 , wherein the second drive shaft is adapted to be mechanically coupled to the cutter unit.

8. The electrically driven device according to claim 1 , wherein the drive pin is adapted to be mechanically coupled to the oscillating body.

9. The electrically driven device according to claim 1 , wherein at least one of the housing or the chassis comprises press ribs to secure the motion of the oscillating body in at least one direction.

10. The electrically driven device according to claim 1 , wherein the electric motor is secured to at least one of the housing, a housing component, the chassis or a chassis component.

11. The electrically driven device according to claim 1 , wherein at least one of the housing, a housing component, the chassis or a chassis component is formed by injection molding.

12. The electrically driven device according to claim 1 , wherein the electrically driven device further comprises a cap, wherein the cap is removably attached to the housing or one of housing components, and wherein the cap is at least covering a button to actuate the electrically driven device.

13. The electrically driven device according to claim 1 , wherein the electric motor and the battery unit are sealed against moisture penetration, by seals of at least one of the housing, a housing component, the chassis, a chassis component or a cap.

14. The electrically driven device according to claim 1 , further comprising two swing arms, wherein the oscillating body, the second drive shaft and the two swing arms define a swing bridge, wherein the oscillating body comprises four quandrants and the second drive shaft is located in one of the four quandrants.

15. The electrically driven device according to claim 1 , wherein the second drive shaft extends from the oscillating body toward and is adapted to be mechanically coupled to the cutter unit.

16. The electrically driven device according to claim 1 , wherein the oscillating body has a center location and the second drive shaft is located in the corner section away from the center location.

17. An electrically driven device comprising a housing and a chassis, wherein the chassis comprises a plastic skeleton for receiving an electric motor having a first drive shaft extending in a first direction, a battery unit, a printed circuit board (PCB) and an oscillating body having a second drive shaft, wherein the chassis is provided with openings or cavities for receiving the electric motor and the battery unit side by side in a second direction transverse to the first direction and is provided with the printed circuit board (PCB) at a lateral side, also side by side to one of the electric motor and the battery unit, wherein the battery unit is located between the printed circuit board (PCB) and the electric motor, and an axis perpendicular to the first drive shaft of the electric motor passes through the first drive shaft of the electric motor, the battery and the printed circuit board, wherein a first longitudinal axis is defined along the second drive shaft, a second longitudinal axis is defined along the first drive shaft and a third longitudinal axis is defined through a center of a body of the battery unit, wherein the first longitudinal axis is between the second and third longitudinal axes, and wherein the oscillating body and the second drive shaft move with a linear oscillating motion.

18. An electrically driven device comprising a housing and a chassis, wherein the chassis comprises a plastic skeleton for receiving an electric motor having a first rotary drive shaft, a battery unit, and an oscillating body having a main body portion and a second drive shaft extending away from the main body portion and toward a cutter unit to drive the cutter unit upon movement of the oscillating body, the oscillating body having a corner section and the second drive shaft is located in the corner section, wherein a first longitudinal axis is defined along the second drive shaft, wherein a second longitudinal axis is defined along the first drive shaft with the second longitudinal axis passing through the oscillating body, and a third longitudinal axis is defined through a center of a body of the battery unit, wherein the second longitudinal axis and the third longitudinal axis are parallel and offset to one another, wherein the electric motor comprises a drive pin rotatable eccentrically about the second longitudinal axis, the drive pin engaging a hole in the main body portion to cause oscillating movement of the main body portion, the second drive shaft moving in the same direction with the main body portion hole during oscillating movement of the main body portion.

19. The electrically driven device according to claim 18 , further comprising two swing arms, wherein the oscillating body, the second drive shaft and the two swing arms define a swing bridge, wherein the oscillating body comprises four quandrants and the second drive shaft is located in one of the four quandrants.

Assignees

• Braun Gmbh

Inventors

• Guo Tiandong
• Lai Xinwu
• Li Kejin
• Gleich Detlef
• Fischer Uwe
• Stassen Bernd

Classifications

• B26B19/26

  of the type performing different methods of operation simultaneously, e.g. reciprocating and oscillating; of the type having two or more heads of differing mode of operation · CPC title

• B26B19/04

  Cutting heads therefor; Cutters therefor; Securing equipment thereof · CPC title

• B26B19/02

  of the reciprocating-cutter type · CPC title

• B26B19/288 Primary

  Balance by opposing oscillation · CPC title

• B26B19/28 Primary

  Drive layout for hair clippers or dry shavers, e.g. providing for electromotive drive (electric motors per se H02) · CPC title