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  Variable tooth saw bladeUSPTO Application #: 20070180972Title: 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. (end of abstract) Agent: Sand & Sebolt - Canton, OH, US Inventors: Jeremy A. Lowder, Scott A. Vilagi USPTO Applicaton #: 20070180972 - Class: 083835000 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20070180972. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation application of U.S. patent application Ser. No. 10/845,284, filed May 13, 2004, which is a continuation-in-part application of U.S. patent application Ser. No. 10/391,425, filed Mar. 18, 2003, now U.S. Pat. No. 7,013,784, which claims priority from U.S. Provisional Patent Application Ser. No. 60/365,999 filed Mar. 19, 2002; the disclosures of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Technical Field [0003] This invention relates to rotary saw blades, and more particularly circular saw blades for use on circular saws or the like. Specifically, the invention is directed to a variable tooth saw blade that cuts faster and smoother while reducing harmonic vibrations. [0004] 2. Background Information [0005] Circular saw blades are readily available for use in cutting wood and other materials using a portable, hand-held circular saw, or a fixed table or radial saws, or other like saws. The saw blades are formed of flat, circular discs made of steel or other like metals. As is well known in the art, circular saw blades include a peripheral edge from which a plurality of circumferentially-spaced teeth project radially outwardly for cutting. [0006] Users continually desire to purchase blades that allow for faster cutting without negative effects such as "burning" of the blade, dulling of the teeth, or jamming of the saw. The ability of the teeth to efficiently cut the material and thus maintain the blade speed is critical. As a result, users continue to desire improved blades providing for faster and/or more efficient cutting. [0007] Users also desire smooth cuts. Often the speed of a cut is inversely correlated to the smoothness of the cut, that is, the faster the user cuts, the rougher is the end cut, and vice versa. As a result, users continue to desire improved smoothness coupled with faster cutting. [0008] Users further desire reduced noise. The high speed at which blades rotate often causes high levels of harmonic vibration leading to excessive noise, undesirable saw or saw blade vibration, and if the vibration is significant, a less than desirable cut. Users thus desire, and often government agencies require, blades providing for reduced noise and thus reduced harmonic vibration. [0009] Consequently, there is a need for an improved saw that cuts faster and smoother while also reducing noise and harmonic vibration. SUMMARY OF THE INVENTION [0010] The present invention provides a saw blade comprising a flat, circular disc having a peripheral outer edge and a center hole; a plurality of circumferentially-spaced teeth each having a cutting edge and projecting radially outwardly from the peripheral outer edge; a first group of the cutting edges defining a first circumferential width between each adjacent pair of the cutting edges in the first group; a second group of the cutting edges defining a second circumferential width between each adjacent pair of the cutting edges in the second group; the second circumferential width differing from the first circumferential width; and a third group having at least two cutting edges defining a third circumferential width as the distance between adjacent cutting edges in the third group; the third circumferential width differing from the first and second circumferential widths. [0011] The invention further provides a saw blade comprising a flat, circular disc having a peripheral outer edge and a center hole, the disc being divided into a first half and a second half, each half being a copy exact of the other half positioned in a diametrically opposite manner; a plurality of circumferentially-spaced teeth each having a cutting edge and projecting radially outwardly from the peripheral outer edge; a first group in each half having five cutting edges including a first cutting edge and a last cutting edge defining therebetween a first group circumferential width of approximately fifty-six degrees; a second group in each half having three cutting edges including a first cutting edge and a last cutting edge defining therebetween a second group circumferential width of approximately forty degrees; a third group in each half having two cutting edges including a first cutting edge and a last cutting edge defining therebetween a third group circumferential width of approximately twenty-five degrees; a first circumferential space being between the first and second groups in each half and having an approximately fourteen-degree circumferential width; a second circumferential space being between the second and third groups in each half and having an approximately twenty-degree circumferential width; and a third circumferential space being between the third group in each half and the first group in the respective other half and having an approximately twenty-five-degree circumferential width. [0012] The invention further provides a saw blade comprising a flat, circular disc having a peripheral outer edge and a center hole, the disc being divided into a first half and a second half, each half being a copy exact of the other half positioned in a diametrically opposite manner; a plurality of circumferentially-spaced teeth each having a cutting edge and projecting radially outwardly from the peripheral outer edge; a first group in each half having nine cutting edges including a first cutting edge and a last cutting edge defining a first group circumferential width therebetween which is approximately thirty-six degrees; a second group in each half having seven cutting edges including a first cutting edge and a last cutting edge defining a second group circumferential width therebetween which is approximately thirty-six degrees; a third group in each half having five cutting edges including a first cutting edge and a last cutting edge defining a second group circumferential width therebetween which is approximately thirty-six degrees; a fourth group in each half having four cutting edges defining a second group circumferential width therebetween which is approximately forty-five degrees; a first circumferential space being between the first and second groups in each half and having an approximately four-and-a-half-degree circumferential width; a second circumferential space being between the second and third groups in each half and having an approximately six-degree circumferential width; a third circumferential space being between the third and fourth groups in each half and having an approximately nine-degree circumferential width; and a fourth circumferential space being between the fourth group in each half and the first group in the respective other half and having an approximately seven-and-a-half-degree circumferential width. [0013] The invention further provides a saw blade comprising a flat, circular disc having a peripheral outer edge and a center hole, the disc being divided into a first half and a second half, each half being a copy exact of the other half positioned in a diametrically opposite manner; a plurality of circumferentially-spaced teeth each having a cutting edge and projecting radially outwardly from the peripheral outer edge; a first group in each half having twelve cutting edges including a first cutting edge and a last cutting edge defining a first group circumferential width therebetween which is approximately thirty-eight-and-a-half degrees; a second group in each half having eight cutting edges including a first cutting edge and a last cutting edge defining a second group circumferential width therebetween which is approximately thirty-two-and-a-half degrees; a third group in each half having twelve cutting edges including a first cutting edge and a last cutting edge defining a second group circumferential width therebetween which is approximately sixty-six degrees; a fourth group in each half having three cutting edges defining a second group circumferential width therebetween which is approximately twenty-one-and-a-half degrees; a first circumferential space being between the first and second groups in each half and having an approximately three-and-a-half-degree circumferential width; a second circumferential space being between the second and third groups in each half and having an approximately four-and-a-half-degree circumferential width; a third circumferential space being between the third and fourth groups in each half and having an approximately six-degree circumferential width; and a fourth circumferential space being between the fourth group in each half and the first group in the respective other half and having an approximately seven-and-a-half-degree circumferential width. BRIEF DESCRIPTION OF THE DRAWINGS [0014] Preferred embodiments of the invention, illustrative of the best modes in which the applicant has contemplated applying the principles, are set forth in the following description and are shown in the drawings and are particularly and distinctly pointed out and set forth in the appended claims. [0015] FIG. 1 is a side view of a first embodiment of the saw blade of the present invention; [0016] FIG. 2 is the same side view of the first embodiment of the saw blade as in FIG. 1 with the sections clearly marked; [0017] FIG. 3 is an enlarged view of a few teeth from the saw blade of the first embodiment in FIGS. 1-2; [0018] FIG. 4 is a side view of a second embodiment of the saw blade of the present invention; [0019] FIG. 5 is the same side view of the second embodiment of the saw blade as in FIG. 4 with the sections clearly marked; [0020] FIG. 6 is an enlarged view of a few teeth from the saw blade of the second embodiment in FIGS. 4-5; Continue reading... Full patent description for Variable tooth saw blade Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Variable tooth saw blade patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. 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