Dual-Cut Saw Blade

• US 20080201964A1
• Filed: 11/05/2007
• Published: 08/28/2008
• Est. Priority Date: 02/26/2007
• Status: Abandoned Application

• Current Assignee: LS Starrett Company
• Original Assignee: LS Starrett Company
• Inventors: Ashton, Max, Camargo, Carlos Augusto de
• Application Number:
  US11/934,926
• Publication Number:
  US 20080201964A1
• Time in Patent Office: Days
• US Class Current: 30/353
• CPC Class Codes: B23D 61/121 Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet
• CPC Class Codes: Y10T 83/04 Processes

Abstract

A saw blade having a concavely curved sawing edge and two oppositely-directed sets of teeth. During reciprocation of the blade, a first set of the teeth may cut during a first stroke direction and the second set of teeth may cut during a second stroke direction.

Claims

1. A saw blade comprising:

a first plurality teeth, each of said first plurality of teeth having a cutting tip directed toward a first end of the blade; and

a second plurality, each of said second plurality of teeth having a cutting tip directed toward a second end of said blade and toward said first plurality of teeth,

said first and second plurality of teeth defining a concave cutting edge.

2. A blade according to claim 1, said blade further comprising a transition portion extending between said first and second plurality of teeth, said transition portion being disposed inwardly from said concave sawing edge.

3. A blade according to claim 2, wherein said first and second pluralities of teeth are provided on a shank portion of said blade, and wherein said transition portion extends across a longitudinal midline of said shank portion.

4. A blade according to claim 1, wherein said first plurality is approximately equal to said second plurality.

5. A blade according to claim 1, wherein said first and second pluralities of teeth are provided on a shank portion of said blade and are symmetrically disposed on opposite sides of a longitudinal midline of said shank portion.

6. A blade according to claim 1, wherein said concave cutting edge extends from a one of said first plurality of teeth nearest said second end of said blade to one of said second plurality of teeth nearest said first end of said blade.

7. A blade according to claim 1, wherein said first and second pluralities of teeth are provided on a shank portion of said blade, and wherein said first plurality teeth comprises a proximal tooth adjacent a proximal end of said shank portion and having a proximal cutting tip;

and said second plurality of teeth comprises a distal tooth adjacent a distal end of said shank portion and having a distal cutting tip, and wherein a straight line connecting said proximal and distal cutting tips is parallel to a cutting direction of said first and second pluralities of teeth.

8. A blade according to claim 7, wherein said straight line is parallel to a rear edge of said blade.

9. A blade according to claim 7, wherein said concave cutting edge line bows inwardly from and intersects with said straight line at said proximal and distal cutting tips.

10. A blade according to claim 7, wherein the ratio of the longitudinal distance between said proximal and distal cutting tips to the transverse distance between said straight line and a nadir of said concave cutting edge is between about 10:

1 and 100;

1.

11. A blade according to claim 1, wherein a nadir of said concave cutting edge occurs between said first and second pluralities of teeth.

12. A blade according to claim 1, wherein said first and second pluralities of teeth are provided on a shank portion of said blade, and wherein the nadir of said concave cutting edge is at a longitudinal midline of said shank portion.

13. A blade according to claim 1, said blade further comprising a proximal end configured for fixed engagement with a saw such that energization of the saw causes continuous reciprocation of the blade between movement in a first linear direction away from the saw, and a second linear direction toward the saw.

14. A saw blade comprising:

a proximal portion configured for fixed engagement with a saw;

a shank portion;

a first plurality teeth on said shank portion, each of said first plurality of teeth having a cutting tip directed toward a distal end of the blade;

a second plurality on said shank portion each of said second plurality of teeth having a cutting tip directed toward a proximal end of said blade and toward said first plurality of teeth; and

a transition portion extending between said first and second plurality of teeth,

said first plurality teeth comprising a proximal tooth adjacent a proximal end of said shank portion and having a proximal cutting tip, and said second plurality of teeth comprising a distal tooth adjacent a distal end of said shank portion and having a distal cutting tip, wherein a straight line connecting said proximal and distal cutting tips is parallel to a cutting direction of said first and second pluralities of teeth,

said first and second plurality of teeth defining a concave cutting edge extending inwardly from said straight line.

15. A blade according to claim 14, wherein said first and second pluralities of teeth are symmetrically disposed on opposite sides of a longitudinal midline of said shank portion.

16. A blade according to claim 14, wherein said straight line is parallel to a rear edge of said blade.

17. A blade according to claim 14, wherein said concave cutting edge intersects with said straight line at said proximal and distal cutting tips.

18. A blade according to claim 14, wherein the ratio of the longitudinal distance between said proximal and distal cutting tips to the transverse distance between said straight line and a nadir of said concave cutting edge is between about 10:

1 and 100;

1.

19. A blade according to claim 14, wherein the nadir of said concave cutting edge is at a longitudinal midline of said shank portion.

20. A method of sawing material comprising:

engaging a blade of a reciprocating saw with the material, said blade comprising;

a first plurality teeth, each of said first plurality of teeth having a cutting tip directed toward a first end of the blade, and

a second plurality, each of said second plurality of teeth having a cutting tip directed toward a second end of said blade and toward said first plurality of teeth,

said first and second plurality of teeth defining a concave cutting edge; and

energizing the saw to cause said continuous reciprocation of said blade with the blade in contact with the material.