Pruning saw

• US 6,125,544 A
• Filed: 10/16/1998
• Issued: 10/03/2000
• Est. Priority Date: 10/17/1997
• Status: Expired due to Fees

• Current Assignee: Sandvik AB
• Original Assignee: Sandvik AB
• Inventors: Lund, Nils-Erik, Eriksson, Eckhard
• Primary Examiner(s): PAYER, HWEI SIU CHOU
• Application Number:
  US09/174,098
• Time in Patent Office: 718 Days
• Field of Search: 30/166.3, 30/514, 30/517, 30/355, 30/357, 83/835
• US Class Current: 30/166.3
• CPC Class Codes: A01G 3/08 Other tools for pruning, branching or delimbing standing trees
• CPC Class Codes: B27B 21/04 Cross-cut saws; Pad saws
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor

Abstract

A pruning saw includes an elongated sawblade which has a line of cutting teeth. Opposite sides of the blade extending between the line of teeth and the back edge are concave. A thinnest waist between the concave sides is located closer to the line of teeth than to the back where the blade has its maximum height. A front edge of the blade forms a rounded corner where it intersects the back edge.

Claims

1. A pruning saw comprising an elongated saw blade and a handle connected to a rear mounting portion of the blade;

the blade including a cutting portion projecting longitudinally forwardly from the handle;

the cutting portion forming a toothed longitudinal edge and a longitudinal back edge situated opposite the toothed edge;

a line of cutting teeth disposed substantially entirely along the toothed edge;

the cutting portion including opposite side surfaces extending between the back edge and the toothed edge and forming side surfaces of the teeth;

a distance between the back edge and the toothed edge defining a height of the blade;

the teeth having rake faces ground therein in a first of the side surfaces and intersecting a second side surface to form front and rear cutting edges on each tooth;

the first and second side surfaces of the blade being concavely curved whereby a thickness of the blade defined between the side surfaces varies from adjacent the toothed edge to adjacent the back edge;

a narrowest thickness of the blade defining a waist of the blade;

the waist disposed closer to the toothed edge than to the back edge in a maximum-height region of the blade.

2. The pruning saw according to claim 1 wherein the blade height varies along a longitudinal length of the blade, the maximum-height region situated adjacent a rear end of the cutting portion.

3. The pruning saw according to claim 2 wherein the rake faces of alternating ones of the teeth are disposed on opposite ones of the side surfaces.

4. The pruning saw according to claim 3 wherein each tooth contains front and rear rake faces forming the front and rear cutting edges, respectively, the front and rear rake faces being angled relative to one another and intersecting one another to form a ridge line extending to a point where the front and rear cutting edges meet, to define a sharply pointed tooth tip at that point.

5. The pruning saw according to claim 1 wherein a distance from the back edge to the waist is at least 1.3 times a distance between the line of teeth and the waist at the maximum-height region.

6. The pruning saw according to claim 5 wherein a front end of the back edge curves toward the toothed edge to form a convexly rounded corner.

7. The pruning saw according to claim 6 wherein the blade includes a front edge extending from the rounded corner to the line of teeth and forming a front edge of a forwardmost one of the teeth.

8. The pruning saw according to claim 1 wherein a front end of the back edge curves toward the toothed edge to form a convexly rounded corner.

9. The pruning saw according to claim 8 wherein the blade includes a front edge extending from the rounded corner to the line of teeth and forming a front edge of a forwardmost one of the teeth.

10. The pruning saw according to claim 1 wherein the rear cutting edge of each tooth forms an angle of attack of 8-14°

relative to a reference plane oriented normal to the line of teeth, and the front cutting edge of each tooth forms an angle of attack of 33-43°

relative to that reference plane.

11. The pruning saw according to claim 1 wherein the teeth are equidistantly spaced and of identical shape.