Two sided pruning saw blade with compound cutting edges

• US 5,901,451 A
• Filed: 08/22/1997
• Issued: 05/11/1999
• Est. Priority Date: 08/22/1997
• Status: Expired due to Fees

• Current Assignee: Toshiro Nakayama
• Original Assignee: Takagi Tools, Inc.
• Inventors: Nakayama, Toshiro
• Primary Examiner(s): Rachuba, M.
• Assistant Examiner(s): VAUGHN, T ANTHONY
• Application Number:
  US08/916,344
• Time in Patent Office: 627 Days
• Field of Search: 83/697, 83/835, 30/353, 30/356, 30/296.1, 30/355, 30/501-02
• US Class Current: 30/502
• CPC Class Codes: A01G 3/08 Other tools for pruning, branching or delimbing standing trees
• CPC Class Codes: B23D 61/126 having cutting teeth along both edges
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor

Abstract

A two sided pruning saw blade has a top cutting edge used for making an undercut of a limb while the bottom cutting edge is used for regular pruning. Both the top cutting edge and the bottom cutting edge have a compound curve containing two radii of curvatures which are different from one another.

Claims

1. A pruning saw blade comprising:

a main body;

a bottom cutting edge formed on a bottom edge of the main body; and

a top cutting edge formed on a top edge of the main body, wherein both said bottom and top cutting edge are formed as a compound curve from internally tangent circles, each formed from at least two circles having different radii.

2. A pruning saw blade according to claim 1, wherein one of the radii is formed over 80% of the bottom cutting edge.

3. A pruning saw blade according to claim 1, wherein one of the radii extends over 80% of the top cutting edge.

4. A pruning saw blade according to claim 1, wherein one of the radii of the top cutting edge extends over 80% of the top cutting edge and wherein one of the radii of the bottom cutting edge extends over 80% of the bottom cutting edge.

5. A pruning saw blade according to claim 1, wherein centers of the radii of the compound cutting edge are located at different predetermined distances from said main body.

6. A pruning saw blade according to claim 1, wherein said bottom cutting edge and said top cutting edge are each formed with a plurality of teeth.

7. A pruning saw blade according to claim 1, wherein said bottom cutting edge is for primary cutting and said top cutting edge is for preliminary cutting.

8. A pruning saw blade according to claim 1, wherein said top cutting edge extends over 50% of a top edge of the main body.

9. A pruning saw blade comprising:

a main body;

a bottom cutting edge formed on a bottom edge of the main body, said bottom cutting edge having a compound curve formed from internally tangent circles, and

a top cutting edge formed on a top edge of the main body, said top cutting edge having a compound curve formed from internally tangent circles.

10. A pruning saw blade according to claim 9, wherein a first radius of the compound curve of the bottom cutting edge is formed over 80% of the bottom cutting edge.

11. A pruning saw blade according to claim 9, wherein a first radius of the compound curve of the top cutting edge extends over 80% of the top cutting edge.

12. A pruning saw blade according to claim 9, wherein a first radius of the compound curve of the top cutting edge extends over 80% of the top cutting edge and wherein a first radius of the compound curve of the bottom cutting edge extends over 80% of the bottom cutting edge.

13. A pruning saw blade according to claim 9, wherein centers of the circles of the compound curves are located at different predetermined distances from said main body.

14. A pruning saw blade according to claim 9, wherein said bottom cutting edge and said top cutting edge are each formed with a plurality of teeth.

15. A pruning saw blade according to claim 9, wherein said bottom cutting edge is for primary cutting and said top cutting edge is for preliminary cutting.

16. A pruning saw blade according to claim 9, wherein said top cutting edge extends over 50% of the top edge of the main body.