Saw blade with tooth form projection

Patent metadata

Field	Value
Publication number	US-9731365-B2
Application number	US-201113313102-A
Country	US
Kind code	B2
Filing date	Dec 7, 2011
Priority date	Dec 7, 2011
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A saw blade, such as a metal-cutting band saw blade, has a cutting edge including a plurality of teeth. A plurality of the teeth include a tip, a clearance surface located on one side of the tip, a rake face located on an opposite side of the tip relative to the clearance surface, a gullet, and a substantially flat, linear, or non-curvilinear projection formed between the rake face and the gullet and projecting outwardly relative to the rake face. The projection is inclined at an acute angle relative to a plane extending between the tips of consecutive unset teeth. The projection defines an inner end adjacent to the rake face and an outer end adjacent to the gullet. The inner end is located at a depth below the tip of at least about 25/1000 inch, and the distance between the inner end and the outer end of the projection in a direction substantially parallel to the plane extending between the tips of at least two teeth is less than about 65/1000 inch.

First claim

What is claimed is:

1. A metal-cutting saw blade, comprising:
a cutting edge including a plurality of teeth thereon,
wherein the teeth each include a tip, a clearance surface located on one side of the tip, a rake face located on an opposite side of the tip relative to the clearance surface, a gullet, a flat or linear projection formed between the rake face and the gullet and projecting outwardly relative to the rake face and adapted to create curled metal chips and move the chips away from the rake face toward an opposite side of the gullet relative to the rake face, a junction radius formed between the projection and the rake face, and a flat gullet entry surface formed between the projection and the gullet,
wherein the projection is inclined at an acute angle within a range of 64° to 79° relative to a plane extending between the tips of at least two of the teeth, wherein the projection extends from the junction radius to the gullet entry surface, wherein the projection defines an inner end adjacent to the junction radius and an outer end adjacent to the gullet entry surface, wherein the inner end is located at a depth below the tip of at least 25/1000 inch, and wherein a distance between the inner end and the outer end of the projection in a direction parallel to the plane is less than 65/1000 inch.

2. A saw blade as defined in claim 1 , wherein the acute angle is within a range of 66° to 70°.

3. A saw blade as defined in claim 1 , wherein the depth is within a range of 25/1000 inch to 65/1000 inch.

4. A saw blade as defined in claim 1 , wherein the depth is within a range of 30/1000 inch to 55/1000 inch.

5. A saw blade as defined in claim 1 , wherein the rake face defines a positive rake angle.

6. A saw blade as defined in claim 5 , wherein the positive rake angle is within a range of 10° to 17°.

7. A saw blade as defined in claim 6 , wherein the positive rake angle is within a range of 12° to 16°.

8. A saw blade as defined in claim 1 , wherein the distance is at least 5/1000 inch.

9. A saw blade as defined in claim 8 , wherein the distance is at least 15/1000 inch.

10. A saw blade as defined in claim 8 , wherein the distance is within a range of 5/1000 inch to 25/1000 inch.

11. A saw blade as defined in claim 10 , wherein the distance is within a range of 8/1000 inch to 20/1000 inch.

12. A saw blade as defined in claim 1 , wherein the plurality of teeth define a repeating set pattern including an unset leading tooth, at least one relatively light set tooth trailing the unset leading tooth and defining a relatively light set magnitude, and at least one relatively heavy set tooth trailing the unset leading tooth and defining a relatively heavy set magnitude in comparison to the set magnitude of the at least one relatively light set tooth, and wherein the at least one relatively heavy set tooth defines a rake angle that is less than a rake angle of one or more of the unset leading tooth and the at least one relatively light set tooth.

13. A saw blade as defined in claim 12 , wherein the rake angle of the at least one relatively heavy set tooth is less than each of the rake angle of the unset leading tooth and the rake angle of the at least one relatively light set trailing tooth.

14. A saw blade as defined in claim 13 , wherein the rake angle of the at least one relatively heavy set tooth is at least 60% less than each of the rake angle of the unset leading tooth and the rake angle of the at least one relatively light set trailing tooth.

15. A saw blade as defined in claim 14 , wherein the rake angle of the at least one relatively heavy set tooth is within a range of 60% to 80% less than each of the rake angle of the unset leading tooth and the rake angle of the at least one relatively light set trailing tooth.

16. A saw blade as defined in claim 14 , wherein the at least one relatively light set tooth includes a relatively light right set trailing tooth and a relatively light left set trailing tooth, and wherein the at least one relatively heavy set tooth includes a relatively heavy left set trailing tooth and a relatively heavy right set trailing tooth.

17. A saw blade as defined in claim 16 , wherein the unset leading tooth is followed by the relatively light right set trailing tooth, which is followed by the relatively heavy left set trailing tooth, which is followed by the relatively heavy right set trailing tooth, which is followed by the relatively light left set trailing tooth.

18. A saw blade as defined in claim 1 , wherein the plurality of teeth define a repeating set pattern including an unset leading tooth, at least one relatively light set tooth trailing the unset leading tooth and defining a relatively light set magnitude, and at least one relatively heavy set tooth trailing the unset leading tooth and defining a relatively heavy set magnitude in comparison to the set magnitude of the at least one relatively light set tooth, and wherein the at least one relatively heavy set tooth defines a primary clearance angle that is less than each of a primary clearance angle of the unset leading tooth and a primary clearance angle of the at least one relatively light set trailing tooth.

19. A saw blade as defined in claim 18 , wherein the primary clearance angle of the at least one relatively heavy set tooth is within a range of 0° to 8°.

20. A saw blade as defined in claim 18 , wherein the primary clearance surface of the at least one relatively heavy set tooth is shorter than each of the primary clearance surface of the unset leading tooth and the primary clearance surface of the at least one relatively light set tooth.

21. A saw blade as defined in claim 20 , wherein the primary clearance surface of the at least one relatively heavy set tooth defines a length within a range of 2/1000 inch to 6/1000 inch.

22. A saw blade as defined in claim 1 , wherein the saw blade is a band saw blade or a hole cutter.

23. A saw blade as defined in claim 1 , wherein the gullet entry surface is oriented normal to the plane, and wherein the gullet entry surface is contiguous to the outer end of the projection.

24. A saw blade as defined in claim 1 , wherein the junction radius is within a range of 5/1000 inch to 15/1000 inch.

25. A saw blade as defined in claim 1 , wherein the plurality of the teeth define a pitch of at least 360/1000 inch.

26. A metal-cutting saw blade, comprising:
a cutting edge including a plurality of teeth thereon,
wherein the teeth each include a tip, a clearance surface located on one side of the tip, a rake face located on an opposite side of the tip relative to the clearance surface, a gullet, means for projecting outwardly from the rake face between the rake face and the gullet, for tangentially contacting and creating curled metal chips, and for moving the chips away from the rake face toward an opposite side of the gullet relative to the rake face, a junction radius formed between the means and the rack face, and a flat gullet entry surface formed between the means and the gullet, wherein the means includes a flat or linear surface inclined at an acute angle within a range of 64° to 79° relative to a plane extending between the tips of at least two of the teeth, wherein the flat or linear surface extends from the junction radius to the gullet entry surface, and wherein the flat or linear surface defines an inner end adjacent to the junction radius and an outer end adjacent to the gullet entry

Assignees

• Cranna Mark T
• Irwin Ind Tool Co

Inventors

• Cranna Mark T

Classifications

• Y10T83/9319

  Toothed blade or tooth therefor · CPC title

• B23D61/1216 Primary

  Repeating pattern of groups having three or more teeth · CPC title

• B23D61/1212 Primary

  Varying pitch · CPC title

• Y10T83/935

  Plural tooth groups · CPC title

• B23D61/121 Primary

  Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet · CPC title