Saw blade for reciprocating saw apparatus

• US 6,782,781 B2
• Filed: 07/16/2002
• Issued: 08/31/2004
• Est. Priority Date: 07/23/2001
• Status: Expired due to Fees

• Current Assignee: Scandus Trading Company LLC
• Original Assignee: Scandus Trading Company LLC
• Inventors: Rack, Allan A.
• Primary Examiner(s): Watts, Douglas D.
• Application Number:
  US10/198,436
• Publication Number:
  US 20030014869A1
• Time in Patent Office: 777 Days
• Field of Search: 838/35, 838/47, 838/52, 838/54, 303/55, 303/92--94
• US Class Current: 83/13
• CPC Class Codes: B23D 61/126 having cutting teeth along both edges
• CPC Class Codes: B23D 61/128 Sabre saw blades
• CPC Class Codes: Y10T 83/04 Processes
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor

Abstract

A saw blade for a reciprocating saw apparatus having first and second longitudinal edges and first and second opposite ends. The saw blade is provided at its first end with an attachment element for attaching the blade to a power unit. The first and second longitudinal edges of the blade are toothed, the teeth of the first and second longitudinal edges being raked towards the first end of the saw blade. The second end of the blade is toothed and is rounded.

Claims

1. A saw blade for a reciprocating saw apparatus, said saw blade having first and second longitudinal edges and first and second opposite ends, wherein the saw blade is provided at its first end with an attachment element for attaching the blade to a power unit, the first and second longitudinal edges of the blade are toothed, the teeth of the first and second longitudinal edges are raked towards the first end of the saw blade, and the second end of the blade is toothed and is rounded, said rounded end having a smooth, continuous, substantially circular contour tangent to both said first and second longitudinal edges with no substantial discontinuity in curvature.

2. A saw blade according to claim 1, wherein the first longitudinal edge of the blade is substantially straight.

3. A saw blade according to claim 1, wherein the first longitudinal edge of the blade includes a concave length segment.

4. A saw blade according to claim 1, wherein the first longitudinal edge of the blade includes a convex length segment.

5. A saw blade according to claim 1, wherein the first and second longitudinal edges of the blade each include a concave length segment.

6. A saw blade according to claim 1, wherein the number of teeth per unit length of the rounded second end of the blade is substantially equal to the number of teeth per unit length of the first longitudinal edge of the blade.

7. A saw blade according to claim 1, wherein the first and second longitudinal edges are of different respective geometrical configurations.

15. A saw blade according to claim 1, wherein the teeth on the rounded tip are small and closely spaced, so that multiple teeth contact a surface to be cut when the tip of the saw blade is first brought into contact with the surface.

16. A saw blade according to claim 1, wherein two proximate teeth of said rounded second end of the blade have opposite rake, and said two teeth having opposite rake are separated by a substantially symmetric notch.

17. A saw blade according to claim 1, wherein two proximate toothed portions of said rounded second end of the blade have opposite rake, and said two proximate teethed portions having opposite rake meet at a tooth having no rake.

18. A saw blade according to claim 1 wherein said saw blade has a longitudinal midpoint wherein the curve of the blade at said mid point is concave and which gradually and progressively become convex at both of the two ends of said saw blade.

8. A reciprocating saw apparatus comprising:

a power unit having a housing and an output member, and

a saw blade having first and second longitudinal edges and first and second opposite ends, the saw blade being attached at its first end to the output member of the power unit and being toothed at its first and second longitudinal edges, the teeth of the first and second longitudinal edges being raked towards the first end of the saw blade, and the second end of the blade being toothed and rounded the rounded end having a smooth continuous substantially circular contour tangent to both said first and second longitudinal edges with no substantial discontinuity in curvature.

9. Apparatus according to claim 8, wherein the first longitudinal edge of the blade is substantially straight.

10. Apparatus according to claim 8, wherein the first longitudinal edge of the blade includes a concave length segment.

11. Apparatus according to claim 8, wherein the first longitudinal edge of the blade includes a convex length segment.

12. Apparatus according to claim 8, wherein the first and second longitudinal edges of the blade each include a concave length segment.

13. Apparatus according to claim 8, wherein the number of teeth per unit length of the rounded second end of the blade is substantially equal to the number of teeth per unit length of the first longitudinal edge of the blade.

14. Apparatus according to claim 8, wherein the first and second longitudinal edges are of different respective geometrical configurations.

19. A method of using a reciprocating saw to cut a surface without the need to access an edge of said surface by attaching a blade with a rounded tip to a power unit comprising the steps of

a) providing a power unit having a housing and an output member;

b) attaching a saw blade having two longitudinal edges which are (toothed) the teeth of the first and second longitudinal edges are raked towards the first end of the saw blade, and the second end of the blade is toothed and is attached and rounded the rounded end having a smooth continuous substantially circular contour tangent to both said first and second longitudinal edges with no substantial discontinuity in curvature,

c) applying the rounded tip of the blade to the surface to be cut whereby the need to pre-cut a pilot hole is avoided;

d) operating the saw whereby the circular portion of the tip continuously provides a visual gauge by which a user can observe depth of cut being made;

e) continuing the cutting operation in more than one direction without the need to reposition the saw.

20. The method of claim 19 wherein the rounded tip of the blade increases the product life of the saw blade and reduces the risk of undesirable blade bending and blade breakage.

21. The method of claim 19 wherein the teeth are suitably positioned and oriented for eroding the surface when the blade is at a relatively steep orientation to the surface.

22. The method of claim 19 wherein the user is enabled to cut both downwards by forcing the saw blade downwards and upwards by forcing the blade upwards without removing the blade from the surface being cut due to the raking of the teeth on each edge that ensures that the operation is similar when cutting is in either direction.

23. The method of claim 22 wherein the saw blade cutting both upwards and downwards is made possible by the rounded tip which enables operation of the saw blade in very confined spaces, at awkward angles, and in very unusual positions.