Tool bit

Patent metadata

Field	Value
Publication number	US-9849570-B2
Application number	US-201414326636-A
Country	US
Kind code	B2
Filing date	Jul 9, 2014
Priority date	Nov 7, 2008
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A tool bit includes a hexagonal drive portion, a working end, and a shank interconnecting the drive portion and the working end. The shank includes an outer peripheral surface having a curvature in a plane including a central axis of the tool bit. The outer peripheral surface having the curvature includes a length in the direction of the central axis. A ratio of the length of the outer peripheral surface having the curvature to the length of the tool bit is between about 0.2:1 and about 0.7:1.

First claim

What is claimed is:

1. A tool bit comprising:
a hexagonal drive portion;
a working end; and
a shank interconnecting the drive portion and the working end, wherein the shank includes an outer peripheral surface having a curvature in a plane including a central axis of the tool bit, wherein the outer peripheral surface having the curvature includes a length in the direction of the central axis, and wherein a ratio of the length of the outer peripheral surface having the curvature to the length of the tool bit is between about 0.2:1 and about 0.7:1;
wherein the curvature is defined by a radius, and wherein a ratio of the radius of the curvature of the outer peripheral surface of the shank to the length of the tool bit is between about 1.25:1 and about 1.75:1.

2. The tool bit of claim 1 , wherein the ratio of the length of the outer peripheral surface to the length of the tool bit is between about 0.3:1 and about 0.4:1.

3. The tool bit of claim 1 , wherein the outer peripheral surface having the curvature defines a maximum diameter of the shank and a minimum diameter of the shank, and wherein a ratio of the minimum diameter to the maximum diameter is between about 0.7:1 and about 0.95:1.

4. The tool bit of claim 1 , wherein the curvature is defined by a radius between about 3 inches and about 50 inches.

5. The tool bit of claim 1 , wherein at least a portion of the shank is polished to a surface finish of at least about 2 microns.

6. The tool bit of claim 5 , wherein the outer peripheral surface having the curvature includes a length, and wherein the shank is polished to a surface finish of at least about 2 microns along the entire length of the outer peripheral surface having the curvature.

7. The tool bit of claim 1 , wherein the hexagonal drive portion and the working end each include a corrosion-resistant coating.

8. The tool bit of claim 1 , wherein the tool bit includes a hardness between about 52 HRC and about 60 HRC.

9. A tool bit comprising:
a hexagonal drive portion;
a working end; and
a shank interconnecting the drive portion and the working end, wherein the shank includes an outer peripheral surface having a curvature in a plane including a central axis of the tool bit, wherein the outer peripheral surface having the curvature includes a length in the direction of the central axis, and wherein a ratio of the length of the outer peripheral surface having the curvature to the length of the tool bit is between about 0.2:1 and about 0.7:1;
wherein the curvature is defined by a radius, and wherein a ratio of the radius of the curvature of the outer peripheral surface of the shank to the length of the tool bit is between about 0.50:1 and about 1:1.

10. The tool bit of claim 9 , wherein the ratio of the length of the outer peripheral surface to the length of the tool bit is between about 0.3:1 and about 0.4:1.

11. The tool bit of claim 9 , wherein the ratio of the length of the outer peripheral surface to the length of the tool bit is between about 0.2:1 and about 0.3:1.

12. The tool bit of claim 9 , wherein the outer peripheral surface having the curvature defines a maximum diameter of the shank and a minimum diameter of the shank, and wherein a ratio of the minimum diameter to the maximum diameter is between about 0.7:1 and about 0.95:1.

13. The tool bit of claim 9 , wherein the curvature is defined by a radius between about 1 inch and about 2 inches.

14. The tool bit of claim 9 , wherein at least a portion of the shank is polished to a surface finish of at least about 2 microns.

15. The tool bit of claim 9 , wherein the hexagonal drive portion and the working end each include a corrosion-resistant coating.

16. A tool bit comprising:
a hexagonal drive portion;
a working end; and
a shank interconnecting the drive portion and the working end, wherein the shank includes an outer peripheral surface having a curvature in a plane including a central axis of the tool bit, wherein the outer peripheral surface having the curvature includes a length in the direction of the central axis, and wherein a ratio of the length of the outer peripheral surface having the curvature to the length of the tool bit is between about 0.2:1 and about 0.7:1
wherein the outer peripheral surface having the curvature defines a maximum diameter of the shank and a minimum diameter of the shank, and wherein a ratio of the minimum diameter to the maximum diameter is between about 0.7:1 and about 0.95:1.

17. The tool bit of claim 16 , wherein the ratio of the length of the outer peripheral surface to the length of the tool bit is between about 0.3:1 and about 0.4:1.

18. The tool bit of claim 16 , wherein the ratio of the length of the outer peripheral surface to the length of the tool bit is between about 0.2:1 and about 0.3:1.

19. The tool bit of claim 16 , wherein at least a portion of the shank is polished to a surface finish of at least about 2 microns.

20. The tool bit of claim 16 , wherein the hexagonal drive portion and the working end each include a corrosion-resistant coating.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Debaker Joseph M

Classifications

• B25B15/005 Primary

  with cross- or star-shaped cross-section · CPC title

• Y10T29/49982

  Coating · CPC title

• B25B15/002 Primary

  characterised by material used or surface finishing · CPC title

• B25B15/008

  Allen-type keys · CPC title

• B23P15/00

  Making specific metal objects by operations not covered by a single other subclass or a group in this subclass · CPC title