Saw blade

• US 4,727,788 A
• Filed: 04/03/1986
• Issued: 03/01/1988
• Est. Priority Date: 04/03/1985
• Status: Expired due to Term

• Current Assignee: Amada Company Limited
• Original Assignee: Amada Company Limited
• Inventors: Tsujimoto, Susumu, Kawabata, Katsuhiko, Yoshida, Sumio, Takegawa, Yoshikazu
• Primary Examiner(s): Bell, Paul A.
• Assistant Examiner(s): Smith, Scott A.
• Application Number:
  US06/847,731
• Time in Patent Office: 698 Days
• Field of Search: 83/846-851, 83/676, 83/661
• US Class Current: 83/848
• 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 83/935 Plural tooth groups
• CPC Class Codes: Y10T 83/9353 Including raker tooth group
• CPC Class Codes: Y10T 83/9355 Including intermediate raker tooth
• CPC Class Codes: Y10T 83/9358 Series of dissimilar teeth

Abstract

A saw blade such as a bandsaw blade, circular saw blade, or backsaw blade has a leading tooth or teeth which cuts the workpiece and advances in a feed direction while the workpiece is being cut and a plurality of trailing teeth which cut the workpiece later than the leading tooth or teeth and serve to widen the leading cut channel. The leading tooth and the trailing teeth form one group in which the heights of the trailing teeth from a basic position on the saw blade are smaller than the height of the leading tooth. The trailing teeth are set in the right and left directions with respect to the saw blade and the leading tooth is unset with respect to the saw blade. Several embodiments are disclosed in which the saw blade has 3,4,5,6,7,8,9, etc., up to 12 teeth. Additionally disclosed are saw blades in which the order of the leading tooth and the trailing teeth are varied, the tips of the teeth form an arc, the leading tooth is formed in a V-shape, the leading tooth has a V-shaped or U-shaped notch in the tip, a cutting removal channel is formed in the gullet of the teeth, and the tips of leading teeth and trailing teeth are configured to conform to a straight-line shape or a shape in the form of the arc of a circle.

Claims

1. A saw blade comprising an unset leading tooth which performs the cutting of a workpiece and advances in a feed direction while the workpiece is being cut, and a plurality of trailing teeth which cut the workpiece later than the leading tooth, which are alternately set in opposed lateral directions, and serve to widen the leading cut channel which is cut by the leading tooth, wherein the leading tooth and the plurality of trailing teeth form one group, wherein the heights of the trailing teeth from a basic position on the saw blade to the tips of the teeth are smaller than the height of the leading tooth from the basic position to its tip, wherein the heights of the trailing teeth are different and wherein the smaller the height of the trailing teeth, the wider is the set of the trailing teeth in the lateral direction.

2. The saw blade of claim 1 wherein both corners of said leading tooth are ground, and further comprising a second leading tooth which is unset and has a height equal to the height of said first leading tooth.

3. The saw blade of claim 2 wherein a cutting discharge channel is formed in the gullet of selected teeth, for directing the chips in the lateral directions.

4. The saw blade of claim 1 further comprising, in addition to the leading unset tooth, a pair of leading teeth of the same height, set in opposed lateral direcions and positioned between the first, unset leading tooth and the first trailing tooth.

5. The saw blade of claim 4 wherein the first leading tooth has a V-shape at the cuting tip.

6. The saw blade of claim 4 in which a notch is formed at the cutting tip of the first leading tooth.

7. The saw blade of claim 2 wherein said leading tooth further comprises third and fourth leading teeth, set in opposed lateral directions and which are positioned between said second leading tooth and the first trailing tooth.

8. The saw blade of claim 1 wherein the trailing teeth are formed so that each successive trailing tooth is not smaller in height than the preceding tooth.