Saw blade tooth form

• US 5,884,547 A
• Filed: 02/25/1997
• Issued: 03/23/1999
• Est. Priority Date: 08/19/1994
• Status: Expired due to Term

• Current Assignee: Black & Decker Incorporated (Stanley Black & Decker, Inc.)
• Original Assignee: Black & Decker Incorporated (Stanley Black & Decker, Inc.)
• Inventors: Parker, George F., Carlsen, Daniel J.
• Primary Examiner(s): Rachuba, M.
• Assistant Examiner(s): Goodman, Charles
• Application Number:
  US08/805,000
• Time in Patent Office: 756 Days
• Field of Search: 83/835, 83/838, 83/853, 83/846, 83/848, 83/849, 83/852, 83/854, 83/855, 30/501, 30/502, 30/166.3, 76/112
• US Class Current: 83/835
• CPC Class Codes: B23D 45/00 Sawing machines or sawing devices with circular saw blades or with friction saw discs shearing machines with rotary discs B23D19/00 - B23D25/00
• CPC Class Codes: B23D 49/00 Machines or devices for sawing with straight reciprocating saw blades, e.g. hacksaws
• CPC Class Codes: B23D 61/021 Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet
• CPC Class Codes: B23D 61/04 with inserted saw teeth , i.e. the teeth being individually inserted
• 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: B23D 61/14 with inserted saw teeth , i.e. the teeth being individually inserted
• CPC Class Codes: B23D 65/02 Making saw teeth by punching, cutting, or planing
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor
• CPC Class Codes: Y10T 83/9326 Plural separable sections
• CPC Class Codes: Y10T 83/936 Series of allochiral teeth
• CPC Class Codes: Y10T 83/9362 Teeth having transversely curved cutting edge

Abstract

A saw blade has a plurality of teeth with each tooth formed by a beveled leading face, a beveled trailing face and a chamfered surface located on the trailing face of each tooth. The trailing and leading faces are beveled in opposite directions in alternate order throughout the saw blade prior to the forming of the chamfered surface. The beveled leading face of each tooth intersects the chamfered surface on the trailing face of each tooth to form a curved cutting edge having a negative rake angle. The beveled faces are manufactured by first forming a plurality of rough-formed gullets. The rough-formed gullets are then finished-formed into beveled gullets by a cold-forming operation prior to the grinding of the chamfered surface to form the curved cutting face of the tooth.

Claims

1. A mass produced saw blade comprising;

a body having two side faces and an edge surface disposed between said two side faces; and

a plurality of teeth disposed along said edge surface of said body between said two side faces, at least one of said plurality of teeth comprising;

a leading face formed by a first frusto conical shaped gullet formed in a first direction relative to one of said side faces of said body such that an axial centerline of the first frusto conical shaped gullet is perpendicular to said one side face;

a trailing face formed by a second frusto conical shaped gullet formed in a second direction relative to said one side face of said body such that an axial centerline of the second frusto conical shaped gullet is perpendicular to said one side face; and

a curved cutting edge formed by said first gullet and a planar surface extending between said two side faces.

2. The saw blade according to claim 1, wherein said planar surface is generally perpendicular to said one side face of said body.

3. The saw blade according to claim 1, wherein said body is manufactured from a first material and said plurality of teeth are manufactured from a second material, said second material being different than said first material.

4. The saw blade according to claim 3, wherein said planar surface is generally perpendicular to said one side face of said body.

5. The saw blade according to claim 3, wherein said second material comprises a high hardenability material and said first material comprises a low hardenability material.

6. A saw tooth comprising:

a body having a pair of side faces;

a leading face formed by a first frusto conical shaped gullet formed in a first direction relative to one side face of said body such that an axial centerline of said first frusto conical shaped gullet is perpendicular to said one side face;

a trailing face formed by a second frusto conical shaped gullet formed in a second direction relative to said one side face of said body such that an axial centerline of said second frusto conical shaped gullet is perpendicular to said one side face; and

a curved cutting edge formed by said first gullet and a surface extending between said pair of side faces.

7. The saw tooth according to claim 6, wherein said surface is generally perpendicular to said one side face of said body.

8. The saw tooth according to claim 6, wherein said body is manufactured from a first material and said curved cutting edge is manufactured from a second material, said second material being different than said first material.

9. The saw tooth according to claim 8, wherein said surface is generally perpendicular to said one side face of said body.

10. The saw blade according to claim 8, wherein said second material comprises a high hardenability material and said first material comprises a low hardenability material.

11. A saw blade comprising:

a body having a pair of side faces and an edge surface disposed between said pair of side faces; and

a plurality of teeth disposed along said edge surface of said body, a first tooth and an adjacent tooth of said plurality of teeth further including;

a first leading face formed on said first tooth by a first frusto conical shaped gullet formed in a first direction relative to one of said side faces of said body such that an axial centerline of the first frusto conical shaped gullet is perpendicular to said one side face;

a second leading face formed on said adjacent tooth by a second frusto conical shaped gullet formed in a second direction relative to said one side face of said body such that an axial centerline of the second frusto conical shaped gullet is perpendicular to said one side face;

a first curved cutting edge formed on said first tooth by an intersection of said first gullet and a first surface extending between said side faces; and

a second curved cutting edge formed on said adjacent tooth by an intersection of said second gullet and a second surface extending between said side faces.

12. The saw blade according to claim 11, wherein said first and second surfaces are generally perpendicular to said one side face of said body.

13. The saw blade according to claim 11, wherein said body is manufactured from a first material and said plurality of teeth are manufactured from a second material, said second material being different than said first material.

14. The saw blade according to claim 13, wherein said first and second surfaces are generally perpendicular to said one side face of said body.

15. A saw blade comprising:

a body having two side surfaces and an edge surface disposed between said two side surfaces; and

a plurality of inserts disposed along said edge surface of said body between said two side surfaces, each of said plurality of inserts having two side faces, at least one of said plurality of inserts comprising;

a leading face formed by a first frusto conical shaped surface having a first axial centerline, said first frusto conical shaped surface being formed in a first direction relative to one of said side faces such that a line through said first axial centerline of said first frusto conical shaped surface is perpendicular to said one side face; and

a curved cutting face formed on an exterior portion of said at least one insert by said first frusto conical shaped surface and a planar surface extending between said two side faces.

16. The saw blade according to claim 15, further comprising a second frusto conical shaped surface having a second axial centerline, said second frusto conical shaped surface being formed on an adjacent insert in a second direction relative to said one side face such that a line through said second axial centerline of said second frusto conical shaped surface is perpendicular to said one side face, said first direction and said second direction being at equal but opposite angles relative to said one side face.

17. The saw blade according to claim 15, wherein said planar surface is generally perpendicular to said body.

18. The saw blade according to claim 17, further comprising a second frusto conical shaped surface having a second axial centerline, said second frusto conical surface being formed on an adjacent insert in a second direction relative to said one side face such that a line through said second axial centerline of said second frusto conical shaped surface is perpendicular to said one side face, said first direction and said second direction being at equal but opposite angles relative to said one side face.

19. A saw tooth insert having two side faces, said insert comprising:

a leading face formed by a first frusto conical shaped surface having a first axial centerline, said first frusto conical shaped surface being formed in a first direction relative to one of said side faces such that a line through said first axial centerline of said first frusto conical shaped surface is perpendicular to said one side face; and

a curved cutting face formed on an exterior portion of said insert by said first frusto conical shaped surface and a planar surface extending between said two side faces.

20. The saw tooth insert according to claim 19, wherein said planar surface is generally perpendicular to said saw tooth.

21. A saw blade comprising:

a body having two side surfaces and an edge surface disposed between said two side surfaces; and

a plurality of inserts disposed along said edge surface of said body, a first insert of said plurality of inserts having two side faces and an adjacent insert of said plurality of inserts having two side faces;

a first leading face formed on said first insert by a first frusto conical shaped surface having a first axial centerline, said first frusto conical shaped surface being formed in a first direction relative to one of said side faces of said first insert such that a line through said first axial centerline of said first frusto-conical shaped surface is perpendicular to said one side face of said first insert;

a second leading face formed on said adjacent insert by a second frusto-conical shaped surface having a second axial centerline, said second frusto-conical shaped surface being formed in a second direction relative to said one face of said first insert such that a line through said second axial centerline of said second frusto-conical shaped surface is perpendicular to said one side face of said first insert, said first and second directions being at equal but opposite angles relative to said one side face of said first insert;

a first curved cutting edge formed on an exterior portion of said first insert by said first frusto conical shaped surface and a first planar surface extending between said two side faces of said first insert; and

a second curved cutting edge formed on an exterior portion of said adjacent insert by said second frusto conical shaped surface and a second planar surface extending between said two side faces of said adjacent insert.

22. The saw blade according to claim 21, wherein said plurality of inserts are carbide inserts.

23. The saw blade according to claim 21, wherein said first and second planar surfaces are generally perpendicular to said two side faces of said first and said adjacent inserts, respectively.