Band saw blade for cutting structural workpieces

Patent metadata

Field	Value
Publication number	US-10537951-B2
Application number	US-201715678851-A
Country	US
Kind code	B2
Filing date	Aug 16, 2017
Priority date	Aug 16, 2017
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

A band saw blade may include a cutting edge defined by a number of teeth. Each tooth may include a tip, a rake face, a primary clearance surface defining a primary relief angle, a secondary clearance surface defining a secondary relief angle greater than the primary relief angle, a tertiary clearance surface defining a tertiary relief angle greater than the secondary relief angle, a first curvilinear protrusion formed between the secondary clearance surface and the tertiary clearance surface, a gullet surface, and a second curvilinear protrusion formed between the rake face and the gullet surface. The teeth may be spaced at varying pitch distances such that a difference between a minimum teeth per inch (TPI) based on a maximum pitch distance and a maximum TPI based on a minimum pitch distance is equal to or greater than 1, and may define a kerf width between 0.115 inches to 0.140 inches.

First claim

That which is claimed is:

1. A band saw blade comprising:
a blade body comprising a cutting edge defined by a plurality of teeth spaced relative to each other, each tooth comprising:
a tip;
a rake face formed on one side of the tip;
a primary clearance surface formed on an opposite side of the tip relative to the rake face and defining a primary relief angle;
a secondary clearance surface formed on an opposite side of the primary clearance surface relative to the tip and defining a secondary relief angle that is greater than the primary relief angle;
a tertiary clearance surface formed on an opposite side of the secondary clearance surface relative to the primary clearance surface and defining a tertiary relief angle that is greater than the secondary relief angle; and
a protrusion formed between the secondary clearance surface and the tertiary clearance surface and having a curvilinear shape, wherein the protrusion is defined by a concave surface and a convex surface, wherein the concave surface extends from the secondary clearance surface to the convex surface, and wherein the convex surface extends from the concave surface to the tertiary clearance surface.

2. The band saw blade of claim 1 , wherein the concave surface has a first radius, and wherein the convex surface has a second radius greater than the first radius.

3. The band saw blade of claim 2 , wherein the first radius is within a range of between approximately 0.125 inches to approximately 0.175 inches, and wherein the second radius is within a range of between approximately 0.075 inches to approximately 0.125 inches.

4. A band saw blade comprising:
a blade body comprising a cutting edge defined by a plurality of teeth spaced relative to each other, each tooth comprising:
a tip;
a rake face formed on one side of the tip;
a primary clearance surface formed on an opposite side of the tip relative to the rake face and defining a primary relief angle;
a secondary clearance surface formed on an opposite side of the primary clearance surface relative to the tip and defining a secondary relief angle that is greater than the primary relief angle;
a tertiary clearance surface formed on an opposite side of the secondary clearance surface relative to the primary clearance surface and defining a tertiary relief angle that is greater than the secondary relief angle;
a gullet surface formed on an opposite side of the rake face relative to the tip; and
a protrusion formed between the rake face and the gullet surface and having a curvilinear shape, wherein the protrusion is defined by a concave surface and a convex surface, wherein the concave surface extends from the rake face to the convex surface, wherein the convex surface extends from the concave surface to the gullet surface, wherein the concave surface has a first radius, and wherein the convex surface has a second radius approximately equal to the first radius.

5. The band saw blade of claim 4 , wherein the first radius and the second radius are within a range of between approximately 0.040 inches to approximately 0.080 inches.

6. A band saw blade comprising:
a blade body comprising a cutting edge defined by a plurality of teeth spaced relative to each other, each tooth comprising:
a tip;
a rake face formed on one side of the tip;
a primary clearance surface formed on an opposite side of the tip relative to the rake face and defining a primary relief angle;
a secondary clearance surface formed on an opposite side of the primary clearance surface relative to the tip and defining a secondary relief angle that is greater than the primary relief angle;
a tertiary clearance surface formed on an opposite side of the secondary clearance surface relative to the primary clearance surface and defining a tertiary relief angle that is greater than the secondary relief angle;
a first protrusion formed between the secondary clearance surface and the tertiary clearance surface and having a first curvilinear shape;
a gullet surface formed on an opposite side of the rake face relative to the tip; and
a second protrusion formed between the rake face and the gullet surface and having a second curvilinear shape;
wherein the plurality of teeth are spaced at varying pitch distances between adjacent teeth such that a difference between a minimum teeth per inch (TPI) based on a maximum pitch distance between a first pair of adjacent teeth and a maximum TPI based on a minimum pitch distance between a second pair of adjacent teeth is equal to or greater than 1;
wherein the plurality of teeth define a set pattern comprising, with respect to a cutting direction of the band saw blade:
a first unset tooth;
a first pair of consecutive light set teeth formed adjacent the first unset tooth in a direction opposite the cutting direction and set to opposite sides of the blade body from one another to a light set magnitude; and
a first pair of consecutive heavy set teeth formed adjacent the first pair of consecutive light set teeth in the direction opposite the cutting direction and set to opposite sides of the blade body from one another to a heavy set magnitude that is greater than the light set magnitude; and

wherein the plurality of teeth define a kerf width that is within a range of between approximately 0.115 inches to approximately 0.140 inches.

7. The band saw blade of claim 6 , wherein the primary relief angle is within a range of between approximately 18 degrees to approximately 22 degrees.

8. The band saw blade of claim 7 , wherein the secondary relief angle is within a range of between approximately 30 degrees to approximately 35 degrees.

9. The band saw blade of claim 8 , wherein the tertiary relief angle is within a range of between approximately 40 degrees to approximately 55 degrees.

10. The band saw blade of claim 6 , wherein the primary clearance surface has a first length in the cutting direction, wherein the secondary clearance surface has a second length in the cutting direction, and wherein the second length is greater than the first length.

11. The band saw blade of claim 6 , wherein each tooth comprises a tip portion formed of a first metal, a base portion formed of a second metal different than the first metal, and a weld zone extending in the cutting direction along an interface of the tip portion and the base portion, wherein the first protrusion extends over a first end of the weld zone, and wherein the second protrusion extends over an opposite second end of the weld zone.

12. The band saw blade of claim 6 , wherein the first protrusion is defined by a concave surface and a convex surface, wherein the concave surface extends from the secondary clearance surface to the convex surface, wherein the convex surface extends from the concave surface to the tertiary clearance surface, wherein the concave surface has a first radius, and wherein the convex surface has a second radius different than the first radius.

13. The band saw blade of claim 6 , wherein the second protrusion is defined by a concave surface and a convex surface, wherein the concave surface extends from the rake face to the convex surface, wherein the convex surface extends from the concave surface to the gullet surface, wherein the concave surface has a first radius, and wherein the convex surface has a second radius approximately equal to the first radius.

14. The band saw blade of claim 6 , wherein the plurality of teeth comprise a 13-tooth pitch pattern.

15. The band saw blade of claim 6 , wherein the plurality of teeth comprise a 10-tooth pitch pattern.

16. The band saw blade of claim 6 , wherein the d

Assignees

• Black & Decker Inc

Inventors

• Hunter Matthew J

Classifications

• Y10T83/9317

  Endless band or belt type · CPC title

• B27B33/02

  Structural design of saw blades or saw teeth · CPC title

• B23D61/123

  Details of saw blade body · 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

• Y10T83/9319

  Toothed blade or tooth therefor · CPC title