Tooth form for a saw blade

• US 6,167,792 B1
• Filed: 01/29/1998
• Issued: 01/02/2001
• Est. Priority Date: 03/23/1995
• Status: Expired due to Term

• Current Assignee: American Saw & Mfg. Company, Inc.
• Original Assignee: American Saw & Mfg. Company, Inc.
• Inventors: Milton-Benoit, John, Hampton, Stephen, Holston, James, Korb, William B.
• Primary Examiner(s): Dexter, Clark F.
• Application Number:
  US09/015,122
• Time in Patent Office: 1,069 Days
• Field of Search: 836/61, 836/63, 838/35, 838/54, 838/55, 761/12, 761/15
• US Class Current: 83/835
• 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 83/9319 Toothed blade or tooth therefor
• CPC Class Codes: Y10T 83/9367 Teeth having cutting edge perpendicular to blade surface

Abstract

In a saw blade having a cutting edge defined by a plurality of teeth disposed along the blade, each tooth includes a tip, a rake face, and a curvilinear base surface. The tip of each tooth and the tip of the next consecutively disposed tooth cooperate to define a pitch distance therebetween, with the curvilinear base surface and the tip of each tooth cooperating to define a maximum gullet depth. In addition, the rake face and the curvilinear base surface of each tooth define an effective gullet radius greater than about 25% of the pitch distance, and also greater than about 55% of the maximum gullet depth.

Claims

1. A saw blade having a cutting edge defined by a plurality of teeth disposed along the blade, each of said teeth having a tip, a rake face adjacent to the tip, a curvilinear base surface located on an opposite side of the rake face relative to the tip, and at least one relief surface located on an opposite side of the tip relative to the rake face, the tip of each tooth and the tip of the next consecutively disposed tooth defining a pitch distance, and the curvilinear base surface and the tip of each tooth cooperating to define a maximum gullet depth, wherein the rake face and the curvilinear base surface of each tooth cooperate to define an effective gullet radius of at least about 30% of the pitch distance and greater than about 55% of the maximum gullet depth, and the rake face defines a length of between about 10% and about 25% of the maximum gullet depth.

2. The saw blade of claim 1 wherein the rake face of each tooth defines a positive rake angle.

3. The saw blade of claim 1 wherein the at least one relief surface of each tooth includes a primary relief surface located on an opposite side of the tip relative to the rake face, and a secondary relief surface located on an opposite side of the primary relief surface relative to the tip, the primary relief surface being defined by a first acute relief angle relative to a plane extending between the tips of consecutively disposed teeth, and the secondary relief surface being defined by a secondary relief angle relative to said plane greater than the first relief angle and between approximately 35°

and approximately 55°

.

4. The saw blade of claim 3 wherein the first relief angle is approximately 35°

.

5. The saw blade of claim 3 wherein the second relief angle is approximately 45°

.

6. The saw blade of claim 1 wherein the curvilinear base surface is defined by a combination of radial and rectilinear sections.

7. A saw blade as defined in claim 1, wherein the effective gullet radius is at least approximately 65% of the maximum gullet depth.

8. A saw blade as defined in claim 1, wherein the maximum gullet depth is greater than approximately 40% of the pitch distance.

9. A saw blade as defined in claim 1, wherein the curvilinear base surface is defined by at least one radius, an end portion of the curvilinear base surface defined by said radius adjoins an adjacent end portion of the rake face, and the adjacent end portion of the rake face is approximately tangential thereto.

10. A saw blade having a cutting edge defined by a plurality of teeth disposed along the blade, each of said teeth having a gullet area defined by a tip, a rake face extending adjacent to the tip, a curvilinear base surface located on an opposite side of the rake face relative to the tip, and at least one relief surface located on an opposite side of the tip relative to the rake face, each tooth and the next consecutively disposed tooth defining a pitch distance extending between the tips thereof, the curvilinear base surface and the tip of each tooth cooperating to define a gullet depth, and the rake face and the curvilinear base surface of each tooth cooperating to define an effective gullet radius, each of said teeth further comprising (i) first means for facilitating the discharge of chips from the gullet area during a cutting operation, said first means being defined by said effective gullet radius being at least approximately 30% of the pitch distance and greater than approximately 55% of the maximum gullet depth, and (ii) second means for enhancing the stress bearing capabilities of the tooth, said second means being defined by the rake face having a length of between approximately 10% and approximately 25% of the maximum gullet depth.

11. The saw blade of claim 10 wherein the rake face defines a positive rake angle as measured relative to a plane approximately perpendicular to a plane extending between the tips of consecutively disposed teeth.

12. The saw blade of claim 10 wherein the curvilinear base surface is defined by a first radius tangent to the rake face and a second radius tangent at one end to the first radius.

13. A saw blade as defined in claim 10, wherein the first means is further defined by a primary relief surface located on an opposite side of the tip relative to the rake face, and a secondary relief surface located on an opposite side of the primary relief surface relative to the tip, the primary relief surface defining a first acute relief angle relative to a plane extending between the tips of consecutively disposed teeth, and the secondary relief surface defining a second relief angle relative to said plane greater than the first relief angle and between approximately 35°

and approximately 55°

.

14. A saw blade as defined in claim 13, wherein the first means is further defined by said first relief angle being at least approximately 35°

.

15. A saw blade as defined in claim 10, wherein the first means is defined by said effective gullet radius being between approximately 65% and approximately 85% of the maximum gullet depth.

16. A saw blade as defined in claim 10, wherein the second means is further defined by an end portion of the rake face adjacent to the curvilinear base surface being approximately tangential thereto.

17. A saw blade as defined in claim 10, wherein the first means is further defined by a primary relief surface located on an opposite side of the tip relative to the rake face, and a secondary relief surface located on an opposite side of the primary relief surface relative to the tip, the primary relief surface defining a first acute relief angle relative to a plane extending between the tips of consecutively disposed teeth, and the secondary relief surface being formed by a curvilinear surface defined by at least one radius.