Band saw blade or hacksaw with double formation of cutting elements

• US 5,901,630 A
• Filed: 10/23/1996
• Issued: 05/11/1999
• Est. Priority Date: 10/25/1995
• Status: Expired due to Fees

• Current Assignee: Akira Funakubo Ishii, Shinnosuke Funakubo Kataoka, Toshio Saito Saito
• Original Assignee: Akira Funakubo Ishii, Shinnosuke Funakubo Kataoka, Toshio Saito Saito
• Inventors: Kataoka, Shinnosuke Funakubo, Ishii, Akira Funakubo, Saito, Toshio Saito
• Primary Examiner(s): RACHUBA, MAURINA T
• Application Number:
  US08/731,986
• Time in Patent Office: 930 Days
• Field of Search: 83/835, 83/846, 83/837, 83/842, 83/661, 83/850, 83/852, 83/854, 83/851, 83/853, 83/848
• 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 83/9324 With additional cutting means
• CPC Class Codes: Y10T 83/9346 Uniformly varying teeth or tooth spacing
• CPC Class Codes: Y10T 83/935 Plural tooth groups

Abstract

A band saw blade or hacksaw characterized because of it is machined with two rows of a plurality of cutting teeth, sustained and projecting from the base itself of the laminar body of the blade, the saw presents a laminar body at one of its ends while at the other end there are teeth with different geometries according to the use for soft cuts or hard cuts along the edge of said body of the band saw, being said rows formed by a pair of teeth of the same geometrical sizes of inverted "V" shape, but being in turn projected at an angular direction according to the required number of teeth +10 degrees, which is equivalent to the desired angle toward the external part of its axis, one with regard to the other, and alternatively followed by only one straight tooth of the same depth and so on, successively.

Claims

1. A saw blade having a double formation of cutting elements for soft or hard cuts, the blade comprising:

a strip having a plane with a first and second lateral sides running along a first longitudinal axis;

a row of cutting elements disposed on the strip and lying on the same plane as the strip comprising a row of teeth having a plurality of alternating unsplit and split teeth separated by a gap, the unsplit teeth having cutting edges directed perpendicular to the first longitudinal axis and the split teeth having first cutting edges directed at an angle to the left of the cutting edges of the unsplit teeth and second cutting edges directed at an angle to the right of the cutting edges of the unsplit teeth;

wherein each unsplit tooth of the plurality of unsplit teeth is followed by a split tooth of the plurality of split teeth and is preceded by a split tooth of the plurality of split teeth and for each split tooth, the first cutting edge has a flat rectangular end and the second cutting edge has a flat rectangular end.

2. The saw blade of claim 1 wherein the first cutting edges of the split teeth directed to the left of the cutting edges of the unsplit teeth are in alignment along a second longitudinal axis and the second cutting edges of the split teeth directed to the right of the cutting edges of the unsplit teeth are in alignment along a third longitudinal axis.

3. The saw blade of claim 1 wherein the first cutting edges of the split teeth are in symmetry with the second cutting edges of the split teeth.

4. The saw blade of claim 1 wherein the saw blade is of a different geometric shape instead of a strip, adapted for use in any type of cutting tool.

5. The saw blade of claim 4 wherein the cutting tool is selected from the group consisting of band saw, circular saw, and hack saw.

6. The saw blade of claim 1 wherein a height of each unsplit tooth and split tooth of the cutting elements are the same.

7. The saw blade of claim 1 wherein a height of each unsplit tooth and split tooth of the cutting elements vary according to the number of teeth in the row of teeth disposed on the strip.

8. The saw blade of claim 1 wherein the angle of the first and second cutting edges of the split teeth used for soft cuts is different from the angle of the first and second cutting edges of the split teeth used for hard cuts.

9. The saw blade of claim 1 wherein the left and right directed cutting edges of the split teeth are separated by a V shaped interior space.

10. The saw blade of claim 1 wherein the width of the row of teeth corresponds to the width of the strip.

11. The saw blade of claim 1 wherein the gap between the split and unsplit teeth differs for soft cuts and for hard cuts.

12. The saw blade of claim 1 wherein the gap between the split and unsplit teeth avoids heating caused by friction during cutting.

13. A method for making the saw blade of claim 1 for soft or hard cuts, comprising the steps of:

(a) providing a blade comprising a strip having a first and second lateral sides and an outer and an inner side;

(b) passing the strip through tooth marking;

(c) machining a row of cutting elements on the outer side of the blade; and

(d) splitting alternate cutting elements thereby forming a row of alternating split and unsplit cutting element.

14. The method of claim 13 wherein the cutting element is a row of teeth having a plurality of alternating unsplit and split tooth;

the unsplit tooth having cutting edges directed perpendicular to the first longitudinal axis and the split tooth having first cutting edges and second cutting edges.

15. The method of claim 14 further comprising bending the split tooth such that the first cutting edges is directed at an angle to the left of the cutting edges of the unsplit tooth and said second cutting edges directed at an angle to the right of the cutting edges of the unsplit tooth.

16. The method of claim 13 wherein the machining of the cutting element produces a gap that prevents heating caused by friction during cutting.

17. The method of claim 13 wherein the marking of the cutting element is by welding or through pressure.

18. The method of claim 13 wherein splitting is done with a die selected form a group consisting of a chisel and a graver.

19. The method of claim 13 wherein the splitting of alternate cutting elements in step (d) allows for production of straight cuts in the absence of undulations.

20. A saw blade having a double formation of cutting elements for soft or hard cuts, the blade comprising:

a strip having a plane with a first and second lateral sides running along a first longitudinal axis;

a row of cutting elements disposed on the strip and lying on the same plane as the strip comprising a row of teeth having a plurality of alternating unsplit and split teeth separated by a gap;

the gap between the split and unsplit teeth differs for soft and hard cut such that the gap for soft cuts is wider than for hard cuts, and depth of each split tooth extends to the base of the blade;

the unsplit teeth having cutting edges directed perpendicular to the first longitudinal axis and the split teeth having first cutting edges directed at an angle to the left of the cutting edges of the unsplit teeth and second cutting edges directed at an angle to the right of the cutting edges of the unsplit teeth;

wherein each unsplit tooth of the plurality of unsplit teeth is followed by a split tooth of the plurality of split teeth and is preceded by a split tooth of the plurality of split teeth, and for each split tooth, the first cutting edge has a flat rectangular end and the second cutting edge has a flat rectangular end.