Enhanced performance saw blade toothform pattern

• US 20070251372A1
• Filed: 12/05/2006
• Published: 11/01/2007
• Est. Priority Date: 04/28/2006
• Status: Active Grant

• Current Assignee: Simonds Saw, LLC
• Original Assignee: Simonds International Corporation
• Inventors: Petts, Dale G., Hopper, Peter B.
• Granted Patent: US 7,913,601 B2
• Time in Patent Office: Days
• US Class Current: 83/846
• CPC Class Codes: B23D 61/021 Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet
• 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 83/9317 Endless band or belt type
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor
• CPC Class Codes: Y10T 83/9346 Uniformly varying teeth or tooth spacing
• CPC Class Codes: Y10T 83/9355 Including intermediate raker tooth

Abstract

A saw blade, such as a bandsaw blade, has a toothform pattern that includes a raker tooth and set teeth. The bandsaw blade teeth are configured such that a distance from a tooth point of the raker tooth to a tooth point of an immediately preceding set tooth is the smallest tooth spacing in the saw blade toothform pattern. With the use of a smaller spacing, the raker tooth removes the smallest chip thickness from a work piece relative to the chip thicknesses removed by the set teeth. This reduces the amount of load imposed on the raker tooth point. In one arrangement, in order to balance the forces on either side of the blade during operation, the saw blade is configured such that an accumulated pitch of the tooth points set to a first side of the blade are substantially equal to the accumulated pitch of the tooth points set to a second opposing side of the blade.

Claims

1. A saw blade, comprising:

a saw blade body; and

a group of teeth disposed on the saw blade body, the group of teeth having a non-set tooth and a plurality of set teeth disposed in a respective set direction relative to a midplane of the saw blade body, at least two teeth of the plurality of set teeth disposed in opposing set directions relative to the midplane of the saw blade body,

each tooth of the group of teeth disposed on the saw blade body at a relative pitch, the pitch defined as a distance between a tooth point of a respective tooth of the group of teeth and a tooth point of a preceding tooth of the group of teeth, the preceding tooth disposed proximate to a front end portion of the respective tooth, the pitch between the non-set tooth and a preceding set tooth being less than the pitch between each set tooth of the plurality of set teeth and a preceding tooth.

2. The saw blade of claim 1, wherein the pitch defined between a set tooth of the plurality of set teeth and the non-set tooth disposed proximate to a front end portion of the set tooth of the plurality of set teeth is greater than the pitch between the non-set tooth and the preceding set tooth and is less than the pitch between each remaining set tooth of the plurality of set teeth a preceding tooth.

3. The saw blade of claim 1, wherein the group of teeth comprises a variation in pitch between a largest pitch of the group of teeth and a smallest pitch of the group of teeth, the variation in pitch being in the range of about 10% to about 25%.

4. The saw blade of claim 1, wherein the group of teeth comprises a variation in pitch between a largest pitch of the group of teeth and a smallest pitch of the group of teeth, the variation in pitch being less than 20%.

5. The saw blade of claim 1, wherein:

the group of teeth comprises the non-set tooth and an even number of set teeth; and

the even number of set teeth comprises a first number of set teeth disposed in a first set direction relative to the midplane of the saw blade body and a second number of set teeth disposed in a second set direction relative to the midplane of the saw blade body, the second set direction opposing the first direction,

a sum of the distances between the tooth points of adjacent teeth of the first number of set teeth being substantially equal to a sum of the distances between the tooth points of adjacent teeth of the second number of set teeth.

6. The saw blade of claim 1, wherein:

the group of teeth comprises a first group of teeth and a second group of teeth, the first group of teeth having a non-set tooth and an odd number of set teeth and the second group of teeth having a non-set tooth and an odd number of set teeth; and

the set teeth of the first group of teeth and the second group of teeth comprising a first number of set teeth disposed in a first set direction relative to the midplane of the saw blade body and a second number of set teeth disposed in a second set direction relative to the midplane of the saw blade body, the second set direction opposing the first direction,

a sum of the distances between the tooth points of adjacent teeth of the first number of set teeth being substantially equal to a sum of the distances between the tooth points of adjacent teeth of the second number of set teeth.

7. The saw blade of claim 1, wherein:

the group of teeth comprises a first group of teeth and a second group of teeth, the first group of teeth having a non-set tooth and an even number of set teeth and the second group of teeth having a non-set tooth and an even number of set teeth; and

the set teeth of the first group of teeth and the second group of teeth comprising a first number of set teeth disposed in a first set direction relative to the midplane of the saw blade body and a second number of set teeth disposed in a second set direction relative to the midplane of the saw blade body, the second set direction opposing the first direction,

a sum of the distances between the tooth points of adjacent teeth of the first number of set teeth being substantially equal to a sum of the distances between the tooth points of adjacent teeth of the second number of set teeth.

8. The saw blade of claim 7, wherein:

in the first group of teeth, adjacent pairs of set teeth are disposed on the saw blade body in a first recurring pattern; and

in the second group of teeth, adjacent pairs of set teeth are disposed on the saw blade body in a second recurring pattern, the second recurring pattern being distinct from the first recurring pattern.

9. The saw blade of claim 1, wherein the non-set tooth comprises a non-set tooth identifier disposed on a front end portion of the non-set tooth.

10. The saw blade of claim 1, wherein the non-set tooth comprises a non-set tooth identifier disposed on a trailing end portion of the non-set tooth.

11. The saw blade of claim 1, wherein each set tooth of the plurality of set teeth comprises a set tooth identifier disposed on a set tooth portion of each of the plurality of set teeth, the set tooth identifier configured to distinguish each set tooth of the plurality of set teeth from the non-set tooth.

12. The saw blade of claim 1, wherein the pitch for a selected tooth of the group of teeth is unequal to the pitch of each non-selected tooth of the group of teeth.

13. A saw blade, comprising:

a saw blade body; and

a group of teeth disposed on the saw blade body, the group of teeth having a non-set tooth and an even number of set teeth, the even number of set teeth having a first number of set teeth disposed in a first set direction relative to a midplane of the saw blade body and a second number of set teeth disposed in a second set direction relative to the midplane of the saw blade body, the second set direction opposing the first direction,

a sum of the distances between the tooth points of adjacent teeth of the first number of set teeth being substantially equal to a sum of the distances between the tooth points of adjacent teeth of the second number of set teeth.

14. The saw blade of claim 13, wherein each tooth of the group of teeth is disposed on the saw blade body at a relative pitch, the pitch defined as a distance between a tooth point of a respective tooth of the group of teeth and a tooth point of a preceding tooth of the group of teeth, the preceding tooth disposed proximate to a front end portion of the respective tooth, the pitch between the non-set tooth and a preceding set tooth being less than the pitch between each set tooth of the plurality of set teeth and a preceding tooth.

15. The saw blade of claim 14, wherein the pitch defined between a set tooth of the plurality of set teeth and the non-set tooth disposed proximate to a front end portion of the set tooth of the plurality of set teeth is greater than the pitch between the non-set tooth and the preceding set tooth and is less than the pitch between each remaining set tooth of the plurality of set teeth a preceding tooth.

16. The saw blade of claim 14, wherein the group of teeth comprises a variation in pitch between a largest pitch of the group of teeth and a smallest pitch of the group of teeth, the variation in pitch being in the range of about 10% to about 25%.

17. The saw blade of claim 13, wherein the non-set tooth comprises a non-set tooth identifier disposed on the non-set tooth.

18. The saw blade of claim 13, wherein

the group of teeth comprises a first group of teeth and a second group of teeth, the first group of teeth having a non-set tooth and an even number of set teeth and the second group of teeth having a non-set tooth and an even number of set teeth;

and

the set teeth of the first group of teeth and the second group of teeth comprising a first number of set teeth disposed in a first set direction relative to the midplane of the saw blade body and a second number of set teeth disposed in a second set direction relative to the midplane of the saw blade body, the second set direction opposing the first direction,

a sum of the distances between the tooth points of adjacent teeth of the first number of set teeth being substantially equal to a sum of the distances between the tooth points of adjacent teeth of the second number of set teeth.

19. The saw blade of claim 18, wherein:

in the first group of teeth, adjacent pairs of set teeth are disposed on the saw blade body in a first recurring pattern; and

in the second group of teeth, adjacent pairs of set teeth are disposed on the saw blade body in a second recurring pattern, the second recurring pattern being distinct from the first recurring pattern.

24. The saw blade of claim 19, wherein the non-set tooth comprises a non-set tooth identifier disposed on the non-set tooth.

20. A saw blade, comprising:

a saw blade body; and

a group of teeth disposed on the saw blade body, the group of teeth having a first group of teeth and a second group of teeth, the first group of teeth having a non-set tooth and an odd number of set teeth and the second group of teeth having a non-set tooth and an odd number of set teeth,

the set teeth of the first group of teeth and the second group of teeth comprising a first number of set teeth disposed in a first set direction relative to the midplane of the saw blade body and a second number of set teeth disposed in a second set direction relative to the midplane of the saw blade body, the second set direction opposing the first direction,

a sum of the distances between the tooth points of adjacent teeth of the first number of set teeth being substantially equal to a sum of the distances between the tooth points of adjacent teeth of the second number of set teeth.

21. The saw blade of claim 20, wherein each tooth of the group of teeth is disposed on the saw blade body at a relative pitch, the pitch defined as a distance between a tooth point of a respective tooth of the group of teeth and a tooth point of a preceding tooth of the group of teeth, the preceding tooth disposed proximate to a front end portion of the respective tooth, the pitch between the non-set tooth and a preceding set tooth being less than the pitch between each set tooth of the plurality of set teeth and a preceding tooth.

22. The saw blade of claim 20, wherein the pitch defined between a set tooth of the plurality of set teeth and the non-set tooth disposed proximate to a front end portion of the set tooth of the plurality of set teeth is greater than the pitch between the non-set tooth and the preceding set tooth and is less than the pitch between each remaining set tooth of the plurality of set teeth a preceding tooth.

23. The saw blade of claim 20, wherein the group of teeth comprises a variation in pitch between a largest pitch of the group of teeth and a smallest pitch of the group of teeth, the variation in pitch being in the range of about 10% to about 25%.