Circular saw blades

Patent metadata

Field	Value
Publication number	US-10279407-B2
Application number	US-201615178615-A
Country	US
Kind code	B2
Filing date	Jun 10, 2016
Priority date	Oct 30, 2015
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A circular saw blade includes a circular plate having a diameter, a thickness, a left face, a right face, a peripheral rim, and a central opening. A plurality of alternating teeth and gullets are disposed about the peripheral rim, each tooth having a front face facing generally toward an adjacent gullet in the cutting direction and a recess defined in the front face. A plurality of cutting inserts are affixed in the recesses in the teeth. Each insert has rake face facing generally toward the adjacent gullet in the cutting direction, a relief face extending generally toward the adjacent top face, and a cutting edge at a junction between the relief face and the rake face. Each rake face is disposed at a hook angle. The relief faces include unbeveled relief faces, left-beveled relief faces, and a right-beveled relief faces arranged in an alternating top bevel with raker pattern.

First claim

What is claimed is:

1. A circular saw blade comprising:
a circular plate having a diameter (D), a thickness (T), a left face, a right face, a peripheral rim, and a central opening couplable to a powered saw for rotation in a cutting direction;
a plurality of alternating teeth and gullets disposed about the peripheral rim, each tooth having a front face facing generally toward an adjacent gullet in the cutting direction and a recess defined in the front face; and
a plurality of cutting inserts, each insert affixed in one of the recesses in the teeth and having a rake face facing generally toward the adjacent gullet in the cutting direction, a relief face extending generally toward an adjacent top face, and a cutting edge at a junction between the relief face and the rake face,
wherein each rake face is disposed at a hook angle (α) between the rake face and a radius of the circular plate intersecting the cutting edge,
wherein the relief faces include a plurality of unbeveled relief faces, left-beveled relief faces beveled toward the left face of the circular plate, and a plurality of right-beveled relief faces beveled toward the right faces of the circular plate, the relief faces arranged in an alternating top bevel with raker (ATB+R) bevel pattern, and
wherein: (a) the plate diameter (D) is 6.5″, the plate thickness (T) is 1.20 mm to 1.34 mm, and the hook angle (α) is 8° to 12°; (b) the plate diameter (D) is 7.25″ to 7.50″, the plate thickness (T) is 0.75 mm to 1.06 mm, and the hook angle (α) is 18° to 27°; (c) the plate diameter (D) is 8.25″ to 8.50″, the plate thickness (T) is 1.17 mm to 1.67 mm, and the hook angle (α) is 18° to 27°; or (d) the plate diameter (D) is 10″ to 12″, the plate thickness (T) is 1.53 mm to 1.67 mm, and the hook angle (α) is 5° to 10°, and wherein a ratio of the thickness (T) (in mm) to the diameter (D) (in inches) is 0.10 mm/inch to 0.19 mm/inch.

2. The circular saw blade of claim 1 , wherein each relief face has a clearance angle (β) between the relief face and a line tangent to an outer circumference of the circular plate that intersects the cutting edge, and (a) if the plate diameter (D) is 6.5″, the clearance angle (β) is 12° to 18°; (b) if the plate diameter (D) is 7.25″ to 7.50″, the clearance angle (β) is 10° to 15°; (c) if the plate diameter (D) is 8.25″ to 8.50″, the clearance angle (β) is 12° to 18°; and (d) if the plate diameter (D) is 10″ to 12″, the clearance angle (β) is 12° to 18°.

3. The circular saw blade of claim 1 , wherein the left-beveled relief faces and the right-beveled relief faces are beveled toward the left and right faces of the circular plate at top bevel angles, and (a) if the plate diameter (D) is 6.50″, the top bevel angles are 18° to 25°; (b) if the plate diameter (D) is 7.25″ to 7.50″, the top bevel angles are 18° to 25°; (c) if the plate diameter (D) is 8.25″ to 8.50″, the top bevel angles are 12° to 20°; and (d) if the plate diameter (D) is 10″ to 12″, the top bevel angles are 12° to 20°.

4. The circular saw blade of claim 1 , wherein the rake faces include a plurality of left-beveled rake faces and a plurality of right-beveled rake faces beveled toward the left and right faces of the circular plate at left and right rake face bevel angles (ωL) and (ωR) relative to a line (L) perpendicular to the circular plate.

5. The circular saw blade of claim 4 , wherein the rake faces further include a plurality of unbeveled rake faces, the rake faces being arranged in an alternating top bevel plus raker (ATB+R) pattern.

6. The circular saw blade of claim 4 , wherein the left and right rake face bevel angles (ωL) and (ωR) are each 2° to 10°.

7. The circular saw blade of claim 1 , wherein each rake face has a hollow grind with a concave profile.

8. The circular saw blade of claim 1 , wherein each of the cutting inserts has a kerf width (K), and (a) if the plate diameter (D) is 6.5″, the kerf width (K) is 1.86 mm to 2.0 mm; (b) if the plate diameter (D) is 7.25″ to 7.50″, the kerf width (K) is 1.48 mm to 1.62 mm; (c) if the plate diameter (D) is 8.25″ to 8.50″, the kerf width (K) is 1.73 mm to 2.23 mm; and (d) if the plate diameter (D) is 10″ to 12″, the kerf width (K) is 2.09 mm to 2.23 mm.

9. A circular saw blade comprising:
a circular plate having a diameter (D), a thickness (T), a left face, a right face, a peripheral rim, and a central opening couplable to a powered saw for rotation in a cutting direction wherein a ratio of the thickness (T) (in mm) to the diameter (D) (in inches) is 0.10 mm/inch to 0.19 mm/inch;
a plurality of alternating teeth and gullets disposed about the peripheral rim, each tooth having a front face facing generally toward an adjacent gullet in the cutting direction and a recess defined in the front face; and
a plurality of cutting inserts, each insert affixed in one of the recesses in the teeth and having a rake face facing generally toward the adjacent gullet in the cutting direction, a relief face extending generally toward the adjacent top face, and a cutting edge at a junction between the relief face and the rake face,
wherein the relief faces include a plurality of unbeveled relief faces, left-beveled relief faces beveled toward the left face of the circular plate, and a plurality of right-beveled relief faces beveled toward the right faces of the circular plate, the relief faces arranged in an alternating top bevel with raker (ATB+R) bevel pattern, and
wherein the rake faces include a plurality of the left-beveled rake faces beveled toward the left face of the circular plate at a left rake face bevel angle (ωL) of 2° to 10° relative to a line (L) perpendicular to the plate, a plurality of right-bevel rake faces beveled toward the right face of the circular plate at a right rake face bevel angle (ωR) of 2° to 10° relative to the line (L), and a plurality of unbeveled rake faces, the rake faces arranged in an alternating top bevel plus raker (ATB+R) pattern.

10. The circular saw blade of claim 9 wherein: (a) the plate diameter (D) is 6.5″ and the plate thickness (T) is 1.20 mm to 1.34 mm; (b) the plate diameter (D) is 7.25″ to 7.50″ and the plate thickness (T) is 0.75 mm to 1.06 mm; (c) the plate diameter (D) is 8.25″ to 8.50″ and the plate thickness (T) is 1.17 mm to 1.67 mm; or (d) the plate diameter (D) is 10″ to 12″, the plate thickness (T) is 1.53 mm to 1.67 mm.

11. The circular saw blade of claim 9 wherein each rake face disposed at a hook angle (α) between the rake face and a radius of the circular plate intersecting the cutting edge and (a) the plate diameter (D) is 6.5″ and the hook angle α is 8° to 12°; (b) the plate diameter (D) is 7.25″ to 7.50″ and the hook angle (α) is 18° to 27°; (c) the plate diameter (D) is 8.25″ to 8.50″ and the hook angle (α) is 18° to 27°; or (d) the plate diameter (D) is 10″ to 12″ and the hook angle (α) is 5° to 10°.

12. The circular saw blade of claim 9 , wherein each relief face has a clearance angle (β) between the relief face and a line tangent to an outer circumference of the circular plate that intersects the cutting edge, and (a) the plate diameter (D) is 6.5″ and the clearance angle (β) is 12° to 18°; (b) the plate diameter (D) is 7.25″ to 7.50″ and the clearance angle (β) is 10° to 15°; (c) the plate diameter (D) is 8.25″ to 8.50″ and the clearance angle (β) is 12° to 18°; or (d) the plate diameter (D) is 10″ to 12″ and the clearance angle (β) is 12° to 18°.

13. The circular saw blade of claim 9 , wherein the left- and right-beveled relief faces are beveled toward the left and right faces of the plate at top bevel angles, and (a) the plate diameter (D) is 6.50″ and the top bevel angles are 18° to 25°; (b) the plate diameter (D) is 7.25

Assignees

• Black & Decker Inc

Inventors

• Brutscher David
• Niblett James R
• Johnson David N
• Roomy Sajid A
• Wells John P

Classifications

• B23D61/04

  with inserted saw teeth {, i.e. the teeth being individually inserted} · CPC title

• B23D61/025

  Details of saw blade body · CPC title

• B23D61/021 Primary

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

• B27B33/12 Primary

  Saw blades having inserted or exchangeably arranged bits or toothed segments · CPC title