Saw blade tooth geometry

• US 5,018,421 A
• Filed: 04/07/1988
• Issued: 05/28/1991
• Est. Priority Date: 04/07/1988
• Status: Expired due to Fees

• Current Assignee: Armstrong-Blum Manufacturing Company
• Original Assignee: Armstrong-Blum Manufacturing Company
• Inventors: Tober, Gerald H., Lucki, Walter J.
• Primary Examiner(s): Yost, Frank T.
• Assistant Examiner(s): Rada, Rinaldi
• Application Number:
  US07/178,498
• Time in Patent Office: 1,146 Days
• Field of Search: 83/661, 83/835, 83/846, 83/847, 83/848, 83/836, 83/839, 76/112
• US Class Current: 83/835
• CPC Class Codes: B23D 61/12 Straight saw blades; Strap saw blades
• 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 83/9317 Endless band or belt type
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor

Abstract

A saw blade of the welded-edge or chemically homogeneous type having a tooth geometry featuring a positive rake angle and a radial relief back for cutting both structural and solid materials.

Claims

1. A welded edge saw blade, said blade extending longitudinally along an axis and having a plurality of teeth wherein each tooth has a positive rake angle from about 7°

to about 12 1/2°

, a depth equal to about .5 times the reciprocal of the pitch of said teeth, a gullet radius equal to about ..23 to .24 times the reciprocal of the pitch of said teeth, a tip included angle of from about 61°

to about 64° and

a radial relief back wherein the center of the radius of said radial relief back is on a first line which intersects the tip of a tooth and is disposed from about 15°

to about 20°

forward of a second line which also intersects said tooth tip and which is perpendicular to the axis.

2. The saw blade of claim 1, wherein the first line is disposed about 20°

forward of the second line.

3. The saw blade of claim 2 wherein said positive rake angle is 7 1/2°

, and said tip included angle is 62 1/2°

.

4. A welded edge saw blade having a base portion and a tooth portion welded to said base portion, said tooth portion comprising a plurality of teeth wherein each tooth has a positive rake angle of 7 1/2°

, a depth equal to about .5 times the reciprocal of the pitch of said teeth, a gullet radius equal to about .23 to .24 times the reciprocal of the pitch of said teeth, a tip included angle of 62 1/2° and

a radial relief back wherein the center of the radius for said radial relief back is on a line which intersects the tip of a tooth and is disposed about 20°

forward of a line which also intersects said tooth tip and which is perpendicular to the line formed by the toothed edge of said saw blade whereby the weld between said base portion and each of said teeth is increased thereby providing increased tooth shear strength.