Drill bit and production method

Patent metadata

Field	Value
Publication number	US-9364927-B2
Application number	US-201213467220-A
Country	US
Kind code	B2
Filing date	May 9, 2012
Priority date	May 12, 2011
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A drill bit 1 has a drill head 3 and a shank 4 . The shank 4 has a body 20 , an add-on part 40 and an internal channel 50 . The drill head 3 is attached to the body 20 . The add-on part 40 is attached to a lateral surface 21 of the body 20 and arranged completely within a cylindrical envelope 29 that circumscribes the body 20 . The internal channel is configured within the add-on part and/or between the add-on part 40 and the lateral surface 21.

First claim

What is claimed is:

1. A drill bit with a drill head and a shank, comprising:
a body, the drill head attached to the body; and
an add-on part attached to a lateral surface of the body and arranged completely within a cylindrical envelope circumscribing the body, the cylindrical envelope having a radius equal to an outermost radius of the body, the lateral surface including a first flank and a second flank each extending radially to the outermost radius, the first flank and the second flank forming a flute with a width of 10 to 25% of the cylindrical envelope, the add-on part extending laterally between the first and second flanks, the add-on part forming an internal channel, for moving material in a direction away from the drill head, laterally between the first and second flanks configured within the add-on part and/or radially inside of the add-on part between the add-on part and the lateral surface.

2. The drill bit as recited in claim 1 wherein the internal channel runs from a first opening at an end of the shank adjacent to the drill head to a second opening on an end of the shank adjacent to an insertion end.

3. The drill bit as recited in claim 2 wherein the add-on part extends from the first opening to the second opening.

4. The drill bit as recited in claim 1 wherein the channel is straight and arranged parallel to an axis of the drill bit and is arranged offset with respect to the axis in the radial direction.

5. The drill bit as recited in claim 1 wherein the lateral surface of the body has at least one concave segment extending along an axis of the drill bit in the circumferential direction, and the add-on part is in contact with the concave segment.

6. The drill bit as recited in claim 5 wherein the concave segment includes the first and second flanks, the first and second flanks facing each other and at a distance from each other in the circumferential direction, the add-on part having a plate-like cover in contact with the first and second flanks.

7. The drill bit as recited in claim 6 wherein the cover is continuously in contact with the first and second flanks along an extension of the first and second flanks along the axis of the drill bit.

8. The drill bit as recited in claim 6 wherein a surface of the cover facing an axis of the drill bit and the concave segment are inner surfaces of the channel.

9. The drill bit as recited in claim 5 wherein the add-on part includes a tubular hollow body having an outer surface that is attached to the concave segment and a circumferentially closed inner surface forming an inner surface of the channel.

10. The drill bit as recited in claim 9 wherein one dimension of the tubular hollow body along the axis of the drill bit corresponds to a dimension of the concave segment along the axis.

11. The drill bit as recited in claim 9 wherein the hollow body is made of a fabric and/or of a plastic.

12. The drill bit as recited in claim 1 wherein the cover is made of plastic.

13. The drill bit as recited in claim 1 wherein the body is a solid body.

14. The drill bit as recited in claim 13 wherein a solid of revolution defined by the body rotating around an axis defines an outer radius, while a cylindrical core touches the lateral surface and is inscribed in the body to define an inner radius, the inner radius amounting to between 25% and 75% of the outer radius.

15. The drill bit as recited in claim 14 wherein the channel is straight.

16. The drill bit as recited in claim 1 wherein the drill head has an axis and two or more edges starting from a tip at the axis.

17. A production method for a drill bit, comprising the following steps:
creating at least one flute in a cylindrical blank to define a body, the flute being oriented along an axis of the blank, the creating the at least one flute including forming first and second flanks of the body each extending radially to an outermost radius of the body, the flute being laterally between the first and second flanks, a width of the flute at the outermost radius of the body being in the range of 10% to 25% of the circumference of the body;
placing an add-on part into the flute such that the add-on part extends laterally between the first and second flanks, the add-on part forming a channel, for moving material in a direction away from the drill head, running along the flute laterally between the first and second flanks inside the add-on part and/or radially inside of the add-on part between the add-on part and a lateral surface of the body, the add-on part being arranged completely within a cylindrical envelope circumscribing the body; and
arranging a cutting element on a face of the blank.

18. The production method as recited in claim 17 wherein the flute is made in the blank by a non-cutting shaping process.

19. The production method as recited in claim 17 further comprising cutting the blank to the length of the drill bit to be produced after the flutes have been made.

20. The production method as recited in claim 17 wherein the add-on part is inserted into the flute and attached by joining materials integrally and/or with a positive fit.

21. The production method as recited in claim 17 further comprising placing a sacrificial element onto the flute, after which the sacrificial element is encapsulated in order to form the add-on part, and subsequently the sacrificial element is removed in order to form the channel.

22. A drill bit with a drill head and a shank, comprising:
a body, the drill head attached to the body, the body having a circumference;
a flute extending in the body, a width of the flute at the circumference being in the range of 10% to 25% of the circumference of the body; and
an add-on part inserted into the flute and attached to a lateral surface of the body and arranged completely within a cylindrical envelope circumscribing the body, an internal channel, for moving material in a direction away from the drill head, being configured within the add-on part and/or between the add-on part and the lateral surface.

23. The drill bit as recited in claim 22 wherein the channel is straight and arranged parallel to an axis of the drill bit and is arranged offset with respect to the axis in the radial direction.

24. The drill bit as recited in claim 22 wherein a solid of revolution defined by the body rotating around an axis defines an outer radius, while a base of the flute defines an inner radius, the inner radius amounting to between 25% and 75% of the outer radius.

25. The drill bit as recited in claim 22 wherein the drill head has an axis and two or more edges starting from a tip at the axis.

26. The drill bit as recited in claim 22 further comprising a further flute, the flute and the further flute being arranged symmetrically on the lateral surface.

Assignees

• Bohn Klaus-Peter
• Grasberger Stefan
• Kleine Werner
• Hilti Ag

Inventors

• Bohn Klaus-Peter
• Grasberger Stefan
• Kleine Werner

Classifications

• B23B2226/75

  Stone, rock or concrete · CPC title

• B23B2251/68

  Drills with provision for suction · CPC title

• B23P15/28 Primary

  cutting tools (sawing tools B23D63/00, B23D65/00; files or rasps B23D73/00) · CPC title

• B23B2251/406

  of special form not otherwise provided for · CPC title

• B23B51/06

  Drills with lubricating or cooling equipment {(B23B51/042 takes precedence)} · CPC title