Electrical appliance for personal care

1. A toothbrush comprising a handle with a longitudinal axis, and a plug-on part which can be attached to the handle, wherein the handle comprises a hand body with a base body and the plug-on part comprises a base body, wherein a plug-shaped coupling structure protrudes from the handle, which plug-shaped coupling structure forms an interface with a substantially mirror-inverted socket-shaped coupling structure of the plug-on part, wherein the interface has at least two stages with different circumferential geometry, wherein at least one of the stages comprises a rotation-preventing means between the handle and the plug-on part, and wherein a stop surface of the handle for the plug-on part extends obliquely with respect to the longitudinal axis of the handle, wherein a material from which the base body of the hand body is formed is harder than a material from which the base body of the plug-on part is formed.

2. The toothbrush as claimed in claim 1 , wherein the stop surface and the longitudinal axis of the handle enclose an angle α of between 30° and 70°.

3. The toothbrush as claimed in claim 1 , wherein a length of the handle from the stop surface of the handle to the rear end of the handle is greater on a front face than on a rear face, such that the stop surface extends from the front rearward.

4. The toothbrush as claimed in claim 1 , wherein the plug-shaped coupling structure of the handle and the mirror-inverted socket-shaped coupling structure of the plug-on part allow straight plugging-on.

5. The toothbrush as claimed in claim 1 , wherein a longitudinal axis of the plug-on part designates the longitudinal axis of the socket-shaped coupling structure, the longitudinal axis of the plug-on part lying in a base region of the plug-on part, wherein a longitudinal axis of a head region lies accordingly in the head region of the plug-on part and wherein an angle Δ lying between A A and A B is between 10° and 30°, the A A being the longitudinal axis of the socket-shaped coupling structure and the A B being the longitudinal axis of the head region.

6. The toothbrush as claimed in claim 1 , wherein the arrangement of the stages is not concentric.

7. The toothbrush as claimed in claim 6 , wherein a midpoint of a succeeding stage in each case lies higher than a midpoint of a preceding stage, as seen from the direction of a free end.

8. The toothbrush as claimed in claim 1 , wherein at a front end or a free end of a second stage, the cross section begins with a chamfer.

9. The toothbrush as claimed in claim 1 , wherein the handle comprises a thermoplastics selected from: acrylonitrile butadiene styrene, polystyrene, styrene acrylonitrile, polybutylene terephthalate, polyethylene terephthalate.

10. The toothbrush as claimed in claim 1 , wherein the length of the handle as far as the end of the interface is between 130 mm to 190 mm.

11. A plug-on part for a toothbrush as claimed in claim 1 , which plug-on part can be attached to a handle, wherein:

the plug-on part has a base region and a head region which are connected by a neck region,

the plug-on part comprises a socket-shaped coupling structure which has at least two stages of different circumferential geometry and which forms the plug-on part side of an interface with a substantially mirror-inverted plug-shaped coupling structure of a handle, and

a longitudinal axis A A of the plug-on designates the longitudinal axis of the socket-shaped coupling structure, the longitudinal axis A A lying in the base region of the plug-on part, wherein a longitudinal axis A B of the head region lies accordingly in the head region of the plug-on part and wherein an angle Δ lying between A A , and A B is between 10° and 30°.

12. The plug-on part as claimed in claim 11 , wherein the plug-on part has a recess which cooperates with a mirror-inverted cam of the handle in the manner of a snap-fit connection.

13. The plug-on part as claimed in claim 11 , wherein at least one of a first stage and a second stage of the at least two stages comprises circumferential projections.

14. The plug-on part as claimed in claim 13 , wherein the projections are formed symmetrically with respect to each other.

15. The plug-on part as claimed in claim 11 , wherein at least one of a first stage and a second stage of the at least two stages comprises circumferential recesses.

16. The plug-on part as claimed in claim 15 , wherein the recesses are formed symmetrically with respect to each other.

17. The plug-on part as claimed in claim 15 , wherein the recesses are arranged to form a cavity between the recesses and a hand body.

18. The plug-on part as claimed in claim 11 , wherein a second stage of the at least two stages comprises an angular ridge on the top.

19. A plug-on part for a toothbrush as claimed in claim 1 , which plug-on part can be attached to a handle, wherein:

the plug-on part has a base region and a head region which are connected by a neck region,

the plug-on part comprises a socket-shaped coupling structure which has at least two stages of different circumferential geometry and which forms the plug-on part side of an interface with a substantially mirror-inverted plug-shaped coupling structure of a handle, and

a second stage of the at least two stages comprises a round ridge arranged on the underside of the second stage and serving as a guiding structure.

20. A toothbrush comprising a handle with a longitudinal axis, and a plug-on part which can be attached to the handle, wherein the handle comprises a hand body with a base body and the plug-on part comprises a base body, wherein a plug-shaped coupling structure protrudes from the handle and forms an interface with a substantially mirror-inverted socket-shaped coupling structure of the plug-on part, wherein the interface has at least two stages with different circumferential geometry, wherein a stop surface between the handle and the plug-on part extends obliquely with respect to the longitudinal axis of the handle, and wherein the handle has a cam which cooperates with a mirror-inverted recess of the plug-on part in the manner of a snap-fit connection, wherein a material from which the base body of the hand body is formed is harder than a material from which the base body of the plug-on part is formed.

21. The toothbrush as claimed in claim 20 , wherein a material from which the cam is formed is harder than a material from which the recess is formed.

22. The toothbrush as claimed in claim 20 , wherein the height of the cam is from 1 mm to 3 mm.

23. The toothbrush as claimed in claim 20 , wherein the length of the plug-shaped coupling structure, measured from a free end to a starting point of the cam, is 20 mm to 40 mm.

24. The toothbrush as claimed in claim 20 , wherein the plug-on part can be plugged onto the plug-shaped coupling structure only in one position.

25. The toothbrush as claimed in claim 20 , wherein the handle or the hand body is formed from a hard component, and in that the plug-on part is formed from a hard component.

26. The toothbrush as claimed in claim 20 , wherein the cam is tree-shaped.

27. The toothbrush as claimed in claim 20 , wherein the recess of the plug-on part has tolerances, with respect to the cam, of 0 to 0.4 mm.