Variable tooth saw blade

Abstract

An apparatus for cutting materials and more specifically an improved saw blade includes a plurality of variable teeth thereon. The variable tooth saw blade cuts faster and smoother while reducing harmonic vibrations. Specifically, the teeth on the saw blade are grouped into sections with differing circumferential widths and differing spacing between the sections.

1 . A saw blade comprising: 
 a flat circular disc having a peripheral outer edge;    a center hole formed in the disc;    a plurality of circumferentially spaced teeth projecting radially outwardly from the peripheral outer edge;    a cutting edge on each of the teeth;    a first group of the cutting edges;    a first circumferential width defined between each adjacent pair of the cutting edges in the first group;    a second group of the cutting edges;    a second circumferential width defined between each adjacent pair of the cutting edges in the second group and differing from the first circumferential width;    a third group of the cutting edges;    a third circumferential width defined between each adjacent pair of the cutting edges in the third group and differing from the first and second circumferential widths;    a fourth group of the cutting edges; and    a fourth circumferential width defined between each adjacent pair of the cutting edges in the fourth group and differing from the first, second and third circumferential widths.    
   
   
       2 . The saw blade of  claim 1  further comprising a first group circumferential width defined between a first of the cutting edges in the first group and a last of the cutting edges in the first group and ranging from 36.5° to 40.5°.  
   
   
       3 . The saw blade of  claim 2  further comprising a second group circumferential width defined between a first of the cutting edges in the second group and a last of the cutting edges in the second group and ranging from 30.5° to 34.5°.  
   
   
       4 . The saw blade of  claim 3  further comprising a third group circumferential width defined between a first of the cutting edges in the third group and a last of the cutting edges in the third group and ranging from 64° to 68°.  
   
   
       5 . The saw blade of  claim 4  further comprising a fourth group circumferential width defined between a first of the cutting edges in the fourth group and a last of the cutting edges in the fourth group and ranging from 19.5° to 23.5°.  
   
   
       6 . The saw blade of  claim 2  further comprising a second group circumferential width defined between a first of the cutting edges in the second group and a last of the cutting edges in the second group and ranging from 64° to 68°.  
   
   
       7 . The saw blade of  claim 2  further comprising a second group circumferential width defined between a first of the cutting edges in the second group and a last of the cutting edges in the second group and ranging from 19.5° to 23.5°.  
   
   
       8 . The saw blade of  claim 1  further comprising a first group circumferential width defined between a first of the cutting edges in the first group and a last of the cutting edges in the first group and ranging from 30.5° to 34.5°.  
   
   
       9 . The saw blade of  claim 8  further comprising a second group circumferential width defined between a first of the cutting edges in the second group and a last of the cutting edges in the second group and ranging from 64° to 68°.  
   
   
       10 . The saw blade of  claim 9  further comprising a third group circumferential width defined between a first of the cutting edges in the third group and a last of the cutting edges in the third group and ranging from 19.5° to 23.5°.  
   
   
       11 . The saw blade of  claim 8  further comprising a second group circumferential width defined between a first of the cutting edges in the second group and a last of the cutting edges in the second group and ranging from 19.5° to 23.5°.  
   
   
       12 . The saw blade of  claim 1  further comprising a first group circumferential width defined between a first of the cutting edges in the first group and a last of the cutting edges in the first group and ranging from 64° to 68°.  
   
   
       13 . The saw blade of  claim 1  wherein the first group comprises three of the cutting edges.  
   
   
       14 . The saw blade of  claim 13  wherein the second group comprises three of the cutting edges.  
   
   
       15 . The saw blade of  claim 13  wherein the first group comprises twelve of the cutting edges.  
   
   
       16 . The saw blade of  claim 15  wherein the second group comprises eight of the cutting edges.  
   
   
       17 . The saw blade of  claim 16  wherein the third group comprises twelve of the cutting edges.  
   
   
       18 . The saw blade of  claim 13  wherein the first group comprises eight of the cutting edges.  
   
   
       19 . The saw blade of  claim 1  wherein the number of cutting edges in the first group is different from the number of cutting edges in the second group.  
   
   
       20 . The saw blade of  claim 19  wherein the number of cutting edges in the first group is different from the number of cutting edges in the third group.  
   
   
       21 . The saw blade of  claim 20  wherein the number of cutting edges in the second group is different from the number of cutting edges in the third group.  
   
   
       22 . The saw blade of  claim 21  wherein the number of cutting edges in the first group is the same as the number of cutting edges in the fourth group.  
   
   
       23 . The saw blade of  claim 20  wherein the number of cutting edges in the second group is the same as the number of cutting edges in the third group.  
   
   
       24 . The saw blade of  claim 20  wherein the number of cutting edges in the first group is the same as the number of cutting edges in the fourth group.  
   
   
       25 . The saw blade of  claim 19  wherein the number of cutting edges in the first group is the same as the number of cutting edges in the third group.