Saw blade tooth form for abusive cutting applications

Patent metadata

Field	Value
Publication number	US-9248518-B2
Application number	US-82765810-A
Country	US
Kind code	B2
Filing date	Jun 30, 2010
Priority date	Jun 30, 2010
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

A recip saw blade has a blade body and a cutting edge extending along the blade body and defined by a repeating pattern of two consecutive teeth suitable for abusive cutting applications. The two consecutive teeth, which may be bi-metal, include a high tooth and a relatively low tooth in comparison to the high tooth. Each high tooth and low tooth include a primary clearance surface defining a relatively shallow primary clearance angle that is about 28° or less, and a secondary clearance surface defining a relatively steep secondary clearance angle in comparison to the primary clearance angle. The primary clearance angle of the high tooth is steeper than the primary clearance angle of the low tooth, such as between about 23° and 28°, and the secondary clearance angle of the high tooth is shallower than the secondary clearance angle of the low tooth.

First claim

What is claimed is:

1. A recip blade, comprising:
a recip blade body having a tang at only one end thereof for chucking only said one end of the recip blade, said tang configured to engage with a chuck of a reciprocating saw configured to reciprocate the recip blade in a reciprocating stroke or motion having a length of no more than about 1½ inches; and
a cutting edge extending along the recip blade body,
wherein the cutting edge includes a repeating pattern of teeth including two consecutive teeth defining a pitch of 10 teeth-per-inch or less, the two consecutive teeth include a high tooth and a relatively low tooth in comparison to the high tooth, each of the high teeth includes a tip, a rake face located on one side of the tip, a primary clearance surface extending from the tip on an opposite side of the tip relative to the rake face and defining a relatively shallow primary clearance angle at the tip within a range of 25° to 27°, and a secondary clearance surface extending from the primary clearance surface on an opposite side of the primary clearance surface relative to the tip and defining a relatively steep secondary clearance angle in comparison to the primary clearance surface, each of the low teeth includes a tip, a rake face located on one side of the tip, a primary clearance surface extending from the tip on an opposite side of the tip relative to the rake face and defining a relatively shallow primary clearance angle within a range of 19° to 23°, and a secondary clearance surface extending from the primary clearance surface on an opposite side of the primary clearance surface relative to the tip and defining a relatively steep secondary clearance angle in comparison to the primary clearance surface.

2. A recip blade as defined in claim 1 , wherein the high tooth and the low tooth have a same rake angle.

3. A recip blade as defined in claim 1 , wherein the secondary clearance angle of the high teeth is within a range of 38° to 45°, and the secondary clearance angle of the low teeth is within a range of 40° to 50°.

4. A recip blade as defined in claim 3 , wherein the secondary clearance angle of the low teeth is steeper than the secondary clearance angle of the high teeth.

5. A recip blade as defined in claim 1 , wherein the high tooth and the low tooth have a vertical or negative rake angle.

6. A recip blade as defined in claim 1 , wherein the high tooth and the low are both set to the same direction.

7. A recip blade as defined in claim 1 , wherein repeating pattern contains no unset teeth.

8. A recip blade as defined in claim 7 , wherein the secondary clearance angle of the high teeth is 40° and the secondary clearance angle of the low teeth is 45°.

9. A recip blade as defined in claim 1 , wherein the difference in height between the high teeth and the low teeth is within a range of 0.002 inch to 0.010 inch prior to any tooth set.

10. A recip blade as defined in claim 1 , wherein the teeth define a pitch of 6 teeth-per-inch.

11. A recip blade as defined in claim 1 , wherein the repeating pattern of teeth defines a plurality of set teeth including at least one first set tooth set to a first set direction and at least one second set tooth set to a second set direction different than the first set direction.

12. A recip blade as defined in claim 11 , wherein the repeating pattern of teeth defines at least one relatively light first set tooth set to a relatively light first set magnitude, at least one relatively heavy first set tooth set to a relatively heavy first set magnitude, at least one relatively light second set tooth set to a relatively light second set magnitude, and at least one relatively heavy second set tooth set to a relatively heavy second set magnitude.

13. A recip blade as defined in claim 12 , wherein at least one of the at least one relatively light first set tooth set to a relatively light first set magnitude and at least one relatively heavy first set tooth set to a relatively heavy first set magnitude are set to the first set direction, and at least one of the at least one relatively light second set tooth set to a relatively light second set magnitude and at least one relatively heavy second set tooth set to a relatively heavy second set magnitude are set to the second set direction.

14. A recip blade as defined in claim 13 , wherein the repeating pattern of teeth defines a leading light first set tooth, a heavy first set tooth trailing the light first set tooth, a light second set tooth trailing the heavy first set tooth, and a heavy second set tooth trailing the light second set tooth.

15. A recip blade as defined in claim 14 , wherein the leading light first set tooth and the heavy first set tooth trailing the light first set tooth are set to the first set direction, and the light second set tooth trailing the heavy first set tooth and the heavy second set tooth trailing the light second set tooth are set to the second set direction.

16. A recip blade as defined in claim 15 , wherein the high teeth are light set and the low teeth are heavy set.

17. A recip blade as defined in claim 11 , wherein the repeating pattern of teeth defines at least one unset tooth.

18. A recip blade as defined in claim 17 , wherein the repeating pattern of teeth defines a leading unset tooth, a first set tooth trailing the leading unset tooth, a second unset tooth trailing the first set tooth, and a second set tooth trailing the second unset tooth.

19. A recip blade as defined in claim 18 , wherein the unset teeth are high teeth and the first and second set teeth are low teeth.

20. A recip blade as defined in claim 1 , wherein the blade body and cutting edge prior to any tooth set define a thickness greater than 0.05 inch.

21. A recip blade as defined in claim 20 , wherein the thickness is within a range from 0.055 inch to 0.070 inch.

22. A recip blade as defined in claim 21 , wherein the thickness is within a range from 0.058 inch to 0.066 inch.

23. A recip blade as defined in claim 1 , wherein the two consecutive teeth are bi-metal.

24. A recip blade, comprising:
a recip blade body having a tang at only one end thereof for chucking only said one end of the recip blade, said tang configured to engage with a chuck of a reciprocating saw configured to reciprocate the recip blade in a reciprocating stroke or motion having a length of no more than about 1½ inches; and
a cutting edge extending along the recip blade body, wherein the cutting edge includes a repeating pattern of teeth including two consecutive teeth defining a pitch of 10 teeth-per-inch or less, the two consecutive teeth include a high tooth and a relatively low tooth in comparison to the high tooth, each of the high teeth includes a tip, a rake face located on one side of the tip, a primary clearance surface extending from the tip on an opposite side of the tip relative to the rake face and defining a relatively shallow primary clearance angle at the tip within a range of 25° to 27°, and a secondary clearance surface extending from the primary clearance surface on an opposite side of the primary clearance surface relative to the tip and defining a relatively steep secondary clearance angle in comparison to the primary clearance surface, each of the low teeth includes a tip, a rake face located on one side of the tip, a primary clearance surface extending from the tip on an opposite side of the tip relative to the rake face and defining a relatively shallow primary clearance ang

Assignees

• Elliston Asif
• Korb William B
• Hampton Stephen A
• Irwin Ind Tool Co

Inventors

• Elliston Asif
• Korb William B
• Hampton Stephen A

Classifications

• B27B33/02

  Structural design of saw blades or saw teeth · CPC title

• B23B2251/14

  Configuration of the cutting part, i.e. the main cutting edges · CPC title

• B23B2251/28

  Arrangement of teeth · CPC title

• Y10T83/9358

  Series of dissimilar teeth · CPC title

• Y10T83/935

  Plural tooth groups · CPC title