Versatile bandsaw blade

• US 7,178,441 B2
• Filed: 12/20/2002
• Issued: 02/20/2007
• Est. Priority Date: 12/20/2002
• Status: Active Grant

• Current Assignee: Kapman AB (Snap-On Incorporated)
• Original Assignee: Kapman AB (Snap-On Incorporated)
• Inventors: Hellbergh, Ha
• Primary Examiner(s): Ashley; Boyer D.
• Assistant Examiner(s): FLORES SANCHEZ, OMAR
• Application Number:
  US10/323,841
• Publication Number:
  US 20040118263A1
• Time in Patent Office: 1,523 Days
• Field of Search: 838/46, 838/47, 838/48, 838/35, 836/61, 838/54, 838/55, 761/12, 76/58
• 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 83/9346 Uniformly varying teeth or tooth spacing
• CPC Class Codes: Y10T 83/935 Plural tooth groups

Abstract

A bandsaw blade includes a blade beam carrying a plurality of cutting teeth separated by gullets. A clearance angle of the teeth is smaller than 35°, and the back of a leading tooth has a convex transition to a gullet. The radius of the gullet is larger than ½ of the depth of the gullet.

Claims

1. A bandsaw blade comprising:

a blade beam formed with a plurality of cutting teeth, wherein successive teeth are separated by a gullet bordered by;

a back of a leading one of the successive teeth, a front of a trailing one of the successive teeth, and a radiused bottom;

the back joining the radiused bottom by a generally convex transition portion;

wherein the teeth form at least two identical groups;

each group including two successive teeth defining a shortest distance therebetween;

wherein the following relationships are valid concerning the teeth of each group;

$\frac{D^{\mathrm{\prime <br><br>}}<br><br>1}{D^{\mathrm{\prime <br><br>}}<br><br>2}=\frac{C^{\mathrm{\prime <br><br>}}<br><br>1}{C^{\mathrm{\prime <br><br>}}<br><br>2}=\sqrt{\frac{A^{\mathrm{\prime <br><br>}}<br><br>1}{A^{\mathrm{\prime <br><br>}}<br><br>2}}$

wherein D′

1 is a depth of a given gullet, D′

2 is a depth of the smallest gullet, C′

1 is a radius of the bottom of the given gullet, C′

2 is the radius of the bottom of the smallest gullet, A′

1 is a distance between successive teeth separated by the given gullet, and A′

2 is a smallest distance between successive teeth.

2. The bandsaw blade according to claim 1 wherein a clearance angle between the successive teeth being less than 35 degrees, and the radiused bottom having a radius larger than one-half of a depth of the respective gullet.

3. The bandsaw blade according to claim 2 wherein the radius of each radiused bottom is about ¾

of the depth of the respective gullet.

4. The bandsaw blade according to claim 2 wherein the clearance angle comprises 30 degrees.

5. The bandsaw blade according to claim 4 wherein the radius of each radiused bottom is about ¾

of the depth of the respective gullet.

6. The bandsaw blade according to claim 1 wherein a ratio of the longest distance to the shortest distance being less than 1.4, where each group comprises more than four teeth, where the teeth of each group include straight (unset) teeth and set teeth, the setting pattern being 0-R-L-0-R-L-, where 0 means unset, R means set to the right, and L means set to the left, and where the setting pattern is independent of where the pattern starts in the group, so that it does not matter which tooth in the group is left unset, set to the right, or set to the left.

7. The bandsaw blade according to claim 6 wherein the ratio is 1.3.

8. The bandsaw blade according to claim 7 wherein a clearance angle between the successive teeth being less than 35 degrees, and the radiused bottom having a radius larger than one-half of a depth of the respective gullet.

9. The bandsaw blade according to claim 6 wherein a clearance angle between the successive teeth being less than 35 degrees, and the radiused bottom having a radius larger than one-half of a depth of the respective gullet.