Manufacturing process, tool stand, and drill bit

Patent metadata

Field	Value
Publication number	US-11577429-B2
Application number	US-202117166932-A
Country	US
Kind code	B2
Filing date	Feb 3, 2021
Priority date	Dec 15, 2015
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

A drill bit includes a drill bit head, a multi-strand helix made up of three or more helix ribs, and a shank end along a drill bit axis. The multi-strand helix is made up of a conveyance area, a helix gradient, and a pitch. The helix ribs extend parallel to the drill bit axis in a first area adjacent to the drill bit head and a second area adjacent to the shank end.

First claim

What is claimed is:

1. A drill bit, comprising:
a drill bit head, a multi-strand helix made up of three or more helix ribs, and a shank end along a drill bit axis;
wherein the multi-strand helix is made up of a conveyance area, an attachment area, a discharge area, a helix gradient, and a pitch, wherein the attachment area is disposed between the drill bit head and the conveyance area and wherein the discharge area is disposed between the conveyance area and the shank end;
wherein the helix ribs extend parallel to the drill bit axis in the attachment area and the discharge area;
wherein the helix gradient constantly increases in size in a direction of the drill bit head in the attachment area with a rate between 0.25 degrees and 2 degrees for every degree that the helix ribs wind around the drill bit axis.

2. The drill bit according to claim 1 , wherein a cross-section of the multi-strand helix is constant from the drill bit head to the discharge area.

3. The drill bit according to claim 1 , wherein the drill bit head has break-off edges parallel to the drill bit axis.

4. The drill bit according to claim 1 , wherein the helix gradient increases in the impact direction in the conveyance area.

5. The drill bit according to claim 4 , wherein the conveyance area extends along more than 80% of a length of the multi-strand helix.

6. The drill bit according to claim 1 , wherein the helix gradient constantly increases in size in a direction of the shank end in the discharge area with a rate between 0.25 degrees and 2 degrees for every degree that the helix ribs wind around the drill bit axis.

7. The drill bit according to claim 1 , wherein the drill bit head is soldered or welded onto a level end surface of the attachment area.

Assignees

• Hilti Ag

Inventors

• Domani Guenter
• Peters Carsten
• Schroeder Florian

Classifications

• E21B10/445

  percussion type, e.g. for masonry · CPC title

• B23B2226/75

  Stone, rock or concrete · CPC title

• B21D11/14

  Twisting · CPC title

• B21K5/04 Primary

  twisting-tools, e.g. drills, reamers · CPC title

• B23B2251/046

  Variable · CPC title