Saw blade tooth form and method therefor

• US 5,946,985 A
• Filed: 09/17/1997
• Issued: 09/07/1999
• 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): Rada, Rinaldi I.
• Assistant Examiner(s): Goodman, Charles
• Application Number:
  US08/932,645
• Time in Patent Office: 720 Days
• Field of Search: 76/112, 76/25.1, 76/75, 76/76, 83/13, 83/835, 83/838, 83/846, 83/848, 83/849, 83/852, 83/853
• US Class Current: 76/112
• 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 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 83/04 Processes
• 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 gullet forming a trailing face, a beveled gullet forming a leading face and a planar surface forming a curved cutting face. The gullets forming the trailing face and the leading face are beveled in opposite directions. The planar surface is generally parallel to the beveled trailing face. The unique tooth profile provides a saw tooth having a positive rake angle to significantly improve the strength of the tooth. The method of manufacturing of the unique tooth profile begins by orienting a saw blade blank about three axes and performing a first grinding operation which forms every other tooth gullet and every other planar surface. The partially formed blank is then oriented about two of the three axes in an opposite direction and a second grinding operation is performed. The second grinding operation grinds the remaining gullets and planar surfaces. The unique tooth profile of the present invention is applicable to jigsaw blades, linear edge saw blades and circular saw blades as well as the various types of bi-metal saw blades.

Claims

1. A method of forming a tooth form for at least one saw blade tooth having a cutting edge, a trailing face and a leading face, said method comprising the steps of:

providing a blank;

orienting said blank a first angular amount about a first axis, a second angular amount about a second axis and a third angular amount about a third axis;

making a pass with a cutting tool to form a curved gullet and a planar surface, both said curved gullet and said planar surface being located on said trailing face;

moving said blank longitudinally with respect to said cutting tool;

orienting said blank a fourth angular amount about said second axis and a fifth angular amount about said third axis; and

making a pass with said cutting tool to form a curved gullet on said leading face;

said curved gullet on said leading face and said planar surface on said trailing face forming said cutting edge for said tooth form.

2. The method according to claim 1 wherein said cutting tool defines a plurality of formed cutting teeth and said step of orienting said blank a first angular amount about a first axis orients said blank generally parallel to said cutting teeth.

3. The method according to claim 2 wherein the step of moving said blank longitudinally with respect to said cutting tool moves said blank generally parallel to said cutting teeth.

4. The method according to claim 1 wherein said at least one tooth is a plurality of teeth on a saw blade and wherein:

said first pass forms said curved gullet and said planar surface on said trailing face of every other of said plurality of teeth, said curved gullet on said trailing face forming said curved gullet on said leading face of each adjacent tooth; and

said second pass forms said curved gullet and said planar surface on said trailing face of said adjacent teeth, said curved gullet on said trailing face of said adjacent teeth forming said curved gullet on said leading face of said every other of said plurality of teeth.

5. The method according to claim 4 wherein said cutting tool defines a plurality of formed cutting teeth and said step of orienting said blank a first angular amount about a first axis orients said blank generally parallel to said cutting teeth.

6. The method according to claim 5 wherein the step of moving said blank longitudinally with respect to said cutting tool moves said blank generally parallel to said cutting teeth.

7. A method of forming a tooth form for at least one saw blade tooth with a cutting tool having an axis of rotation, said saw blade tooth having a cutting edge, a trailing face and a leading face which define a tooth pitch, said method comprising the steps of:

providing a blank;

determining a first angular amount said blank must be rotated about a first axis to produce said tooth form;

determining a second angular amount said blank must be rotated about a second axis to produce said tooth form;

determining a third angular amount said blank must be rotated about a third axis to produce said tooth form;

locating said blank at a position with respect to said axis of rotation of said cutting wheel such that said blank is rotated said first, second and third angular amounts about said first, second and third axes, respectively;

making a pass with respect to said cutting tool to form a curved gullet and a planar surface, both said curved gullet and said planar surface being located on said trailing face;

adjusting said blank with respect to said cutting tool an amount equivalent to said tooth pitch;

determining a fourth angular amount said blank must be rotated about said second axis to produce said tooth form;

determining a fifth angular amount said blank must be rotated about said third axis to produce said tooth form;

locating said blank at a position with respect to said axis of said cutting wheel such that said blank is rotated said first, fourth and fifth angular amounts about said first, second and third axes, respectively; and

making a pass with respect to said cutting tool to form a curved gullet on said leading face;

said curved gullet on said leading face and said planar surface on said trailing face forming said cutting edge for said tooth form.

8. The method according to claim 7 wherein said at least one tooth is a plurality of teeth on a saw blade and wherein:

said first pass forms said curved gullet and said planar surface on said trailing face of every other of said plurality of teeth, said curved gullet on said trailing face forming said curved gullet on said leading face of each adjacent tooth; and

said second pass forms said curved gullet and said planar surface on said trailing face of said adjacent teeth, said curved gullet on said trailing face of said adjacent teeth forming said curved gullet on said leading face of said every other of said plurality of teeth.

9. A method of forming a tooth form for at least one saw blade tooth having a side face, a cutting edge, a trailing face and a leading face, said method comprising the steps of:

providing a blank;

orienting said blank a first angular amount about a first axis, a second angular amount about a second axis and a third angular amount about a third axis;

making a pass with a cutting tool to form a curved gullet and a planar surface, both said curved gullet and said planar surface being located on said trailing face;

moving said blank longitudinally with respect to said cutting tool;

orientating said blank a fourth angular amount about said second axis and a fifth angular amount about said third axis; and

making a pass with said cutting tool to form a curved gullet on said leading face;

said curved gullet on said leading face and said planar surface on said trailing face being angled in opposite directions with respect to said side face to form said cutting edge for said tooth form.

10. A method of forming a tooth form for at least one saw blade tooth having a cutting edge formed by a planar surface and a curved surface, a trailing face and a leading face, said method comprising the steps of:

providing a blank;

orienting said blank a first angular amount about a first axis, a second angular amount about a second axis and a third angular amount about a third axis;

making a pass with a cutting tool to form a curved gullet and said planar surface, both said curved gullet and said planar surface being located on said trailing face;

moving said blank longitudinally with respect to said cutting tool;

orientating said blank a fourth angular amount about said second axis and a fifth angular amount about said third axis; and

making a pass with said cutting tool to form a curved gullet and said curved surface, said curved gullet and said curved surface being located on said leading face;

said curved gullet on said leading face and said planar surface on said trailing face forming said cutting edge for said tooth form.

11. A method of forming a tooth form for at least one saw blade tooth having a cutting edge, a trailing face and a leading face, said method comprising the steps of:

providing a blank;

orienting said blank a first angular amount about a first axis, a second angular amount about a second axis and a third angular amount about a third axis;

making a pass with a cutting tool to form a curved gullet and a planar surface, both said curved gullet and said planar surface being located on said trailing face, said planar surface forming an acute angle with respect to one side of said blank;

moving said blank longitudinally with respect to said cutting tool;

orienting said blank a fourth angular amount about said second axis and a fifth angular amount about said third axis; and

making a pass with said cutting tool to form a curved gullet on said leading face;

said curved gullet on said leading face and said planar surface on said trailing face forming said cutting edge for said tooth form.

12. A method of forming a tooth form for at least one saw blade tooth having a cutting edge, a trailing face and a leading face, said method comprising the steps of:

providing a blank;

orienting said blank a first angular amount about a first axis, a second angular amount about a second axis and a third angular amount about a third axis;

making a pass with a cutting tool to form a curved gullet and a planar surface, both said curved gullet and said planar surface being located on said trailing face, said curved gullet on said trailing face and said planar surface being formed at equal angles with respect to one side of said blank;

moving said blank longitudinally with respect to said cutting tool;

orienting said blank a fourth angular amount about said second axis and a fifth angular amount about said third axis; and

making a pass with said cutting tool to form a curved gullet on said leading face;

said curved gullet on said leading face and said planar surface on said trailing face forming said cutting edge for said tooth form.

13. A method of forming a tooth form for at least one saw blade tooth with a cutting tool having an axis of rotation, said saw blade tooth having a cutting edge, a trailing face and a leading face which define a tooth pitch, said method comprising the steps of:

providing a blank;

determining a first angular amount said blank must be rotated about a first axis to produce said tooth form;

determining a second angular amount said blank must be rotated about a second axis to produce said tooth form;

determining a third angular amount said blank must be rotated about a third axis to produce said tooth form;

locating said blank at a position with respect to said axis of rotation of said cutting wheel such that said blank is rotated said first, second and third angular amounts about said first, second and third axes, respectively;

making a pass with respect to said cutting tool to form a curved gullet and a planar surface, both said curved gullet and said planar surface being located on said trailing face, said planar surface forming an acute angle with respect to one side of said blank;

adjusting said blank with respect to said cutting tool an amount equivalent to said tooth pitch;

determining a fourth angular amount said blank must be rotated about said second axis to produce said tooth form;

determining a fifth angular amount said blank must be rotated about said third axis to produce said tooth form;

locating said blank at a position with respect to said axis of said cutting wheel such that said blank is rotated said first, fourth and fifth angular amounts about said first, second and third axes, respectively; and

making a pass with respect to said cutting tool to form a curved gullet on said leading face;

said curved gullet on said leading face and said planar surface on said trailing face forming said cutting edge for said tooth form.

14. A method of forming a tooth form for at least one saw blade tooth with a cutting tool having an axis of rotation, said saw blade tooth having a cutting edge, a trailing face and a leading face which define a tooth pitch, said method comprising the steps of:

providing a blank;

determining a first angular amount said blank must be rotated about a first axis to produce said tooth form;

determining a second angular amount said blank must be rotated about a second axis to produce said tooth form;

determining a third angular amount said blank must be rotated about a third axis to produce said tooth form;

locating said blank at a position with respect to said axis of rotation of said cutting wheel such that said blank is rotated said first, second and third angular amounts about said first, second and third axes, respectively;

making a pass with respect to said cutting tool to form a curved gullet and a planar surface, both said curved gullet and said planar surface being located on said trailing face, said curved gullet on said trailing face and said planar surface being formed at equal angles with respect to one side of said blank;

adjusting said blank with respect to said cutting tool an amount equivalent to said tooth pitch;

determining a fourth angular amount said blank must be rotated about said second axis to produce said tooth form;

determining a fifth angular amount said blank must be rotated about said third axis to produce said tooth form;

locating said blank at a position with respect to said axis of said cutting wheel such that said blank is rotated said first, fourth and fifth angular amounts about said first, second and third axes, respectively; and

making a pass with respect to said cutting tool to form a curved gullet on said leading face;

said curved gullet on said leading face and said planar surface on said trailing face forming said cutting edge for said tooth form.