Power tool having a receptacle for securing a tool

1. A power tool comprising

a motor-driven drive shaft having a longitudinal axis and having a free end;

a securing section provided on said free end of said drive shaft for engaging a receiving opening provided on said tool;

said securing section comprising four rounded tips arranged at equal radial distances from said longitudinal axis, at angular intervals of 90° between each other, each rounded tip having a pair of lateral flanks extending from a common apex toward a section of a circle extending around said longitudinal axis.

2. A power tool comprising

a motor-driven drive shaft having a longitudinal axis and having a free end;

a securing section provided on said free end of said drive shaft for engaging a receiving opening provided on said tool;

said securing section comprising a cylindrical section from which protrude to the outside a plurality of rounded tips arranged at equal radial distances from said longitudinal axis, at equal angular intervals between each other, each rounded tip having a pair of lateral flanks extending from said rounded tip and ending in said cylindrical section.

3. The power tool of claim 2 , wherein said securing section comprises four rounded tips.

4. The power tool of claim 2 , further comprising a threaded blind hole arranged on said drive shaft, and further comprising a securing screw adapted for screwing into said threaded blind hole for securing a tool on said securing section.

5. A power tool comprising

a motor-driven drive shaft having a longitudinal axis and having a free end;

a securing section provided on said free end of said drive shaft for engaging a receiving opening provided on said tool;

said securing section comprising four rounded tips arranged at a radial distance from said longitudinal axis, said rounded tips being connected by lateral flanks forming recesses between said tips;

wherein each of said rounded tips form a pair of tips with each adjacent tip, each said pair of adjacent tips being continuously connected by lateral flanks extending from said pair of adjacent tips toward said longitudinal axis and converging in a common apex.

6. The power tool of claim 5 , further comprising a threaded blind hole arranged on said drive shaft, and further comprising a securing screw adapted for screwing into said threaded blind hole for securing a tool on said securing section.

7. A combination of a power tool and a tool comprising:

a motor-driven drive shaft having a longitudinal axis and having a free end;

a securing section provided on said free end of said drive shaft for engaging a receiving opening provided on said tool;

said securing section comprising n rounded tips arranged at even radial distances from said longitudinal axis, at angular intervals between each other, each rounded tip having a pair of lateral flanks extending from a common apex toward an intermediate section connecting lateral flanks of a pair of adjacent rounded tips; and

and a tool comprising a receiving opening defining a longitudinal axis extending there through, said receiving opening comprising 2n rounded tips arranged at a radial distance from said longitudinal axis, said rounded tips being connected by lateral flanks forming recesses between said rounded tips;

wherein n is any natural number greater than 1; and

wherein said securing section of said drive shaft and said receiving opening of said tool are matched to each other so as to allow a positive engagement of said tool with said securing section.

8. The tool of claim 7 , wherein said lateral flanks are arch-shaped.

9. A tool comprising a receiving opening defining a longitudinal axis extending there through, said receiving opening comprising eight bulges arranged at a radial distance from said longitudinal axis, said bulges being connected by lateral flanks forming recesses between said bulges.

10. A tool comprising a working section and a holding section, said holding section having a receiving opening defining a longitudinal axis extending there through, said receiving opening being configured for attachment to an end of a drive shaft of a motor-driven power tool, said holding section having a surface facing said end of said drive shaft, said holding section on its surface facing the drive shaft further comprising a coating comprising a friction enhancing material.

11. The tool of claim 10 , wherein said coating is a hard metal granulate coating.

12. A tool comprising a working section and a holding section, said holding section having a receiving opening defining a longitudinal axis extending there through, said receiving opening being configured for attachment to an end of a drive shaft of a motor-driven power tool, said receiving opening comprising eight rounded tips arranged at a radial distance from said longitudinal axis, said rounded tips being connected by lateral flanks forming recesses between said tips.

13. The tool of claim 12 , wherein said holding section has a surface facing the drive shaft and comprising a coating made of a friction enhancing material.

14. An adapter for securing a tool having a holding section comprising a receiving opening to a securing section of a drive shaft of a power tool, said adapter comprising:

an adapter disk comprising a longitudinal axis and having a first side facing said power tool and a second side facing said tool;

a recess arranged on said first side, and having a certain shape for engaging said securing section of said power tool;

a raised section arranged on said second side, said raised section having a shape being different from the shape of said recess, said raised section comprising a cylindrical section from which at least three rounded tips arranged at even angular intervals between each other protrude to the outside.

15. The adapter of claim 14 , wherein said cylindrical section defines a free end of said drive shaft axially protruding beyond said rounded tips.

16. The adapter of claim 14 , wherein said raised section comprises four rounded tips.

17. The adapter of claim 14 , wherein a coating comprising a friction enhancing material is applied to a surface of said first side facing said drive shaft.

18. The tool of claim 17 , wherein said coating comprises a hard metal granulate coating.

19. The adapter of claim 14 , further comprising a threaded blind hole arranged on said drive shaft, and further comprising a securing screw having a threaded portion adapted for screwing into said threaded blind hole for securing a tool on said securing section.

20. An adapter for securing a tool having a holding section comprising a receiving opening to a securing section of a drive shaft of a power tool, said adapter comprising:

an adapter disk comprising a longitudinal axis and having a first side facing said power tool and a second side facing said tool;

a recess arranged on said first side, and having a certain shape for engaging said securing section of said power tool;

a raised section arranged on said second side, said raised section having a shape being different from the shape of said recess, said holding section on its surface facing the drive shaft further comprising a coating comprising a friction enhancing material.

21. The tool of claim 20 , wherein said coating is a hard metal granulate coating.

22. An adapter for securing a tool having a receiving opening to a securing section of a drive shaft of a power tool, said adapter comprising:

an adapter disk comprising a longitudinal axis and having a first side facing said power tool and a second side facing said tool;

a recess arranged on said first side, and having a certain shape for engaging said securing section of said power tool;

a raised section arranged on said second side, said raised section having a shape being different from the shape of said recess, said raised section comprising a cylindrical section from which at least three rounded tips arranged at even angular intervals between each other protrude to the outside.

23. An adapter for securing a tool having a receiving opening to a securing section of a drive shaft of a power tool, said adapter comprising:

an adapter disk comprising a longitudinal axis and having a first side facing said power tool and a second side facing said tool;

a recess arranged on said first side, and having a certain shape for engaging said securing section of said power tool;

a raised section arranged on said second side, said raised section having a shape being different from the shape of said recess, said raised section comprising four rounded tips arranged at a radial distance from said longitudinal axis, said tips being connected by lateral flanks forming recesses between said tips;

wherein each of said tips forms a pair of tips with each adjacent tip, each said pair of adjacent tips being continuously connected by lateral flanks extending from said pair of adjacent tips toward said longitudinal axis and converging in a common apex.

24. The adapter of claim 23 , wherein a coating comprising a friction enhancing material is applied to a surface of said first side facing said drive shaft.

25. The tool of claim 24 , wherein said coating comprises a hard metal granulate coating.

26. The adapter of claim 24 , further comprising a threaded blind hole arranged on said drive shaft, and further comprising a securing screw having a threaded portion adapted for screwing into said threaded blind hole for securing a tool on said securing section.