Saw blade

• US 5,425,296 A
• Filed: 06/24/1994
• Issued: 06/20/1995
• Est. Priority Date: 01/10/1992
• Status: Expired due to Term

• Current Assignee: Wikus-Saegenfabrik Wilhelm H. Kullmann GmbH & Co. Kg
• Original Assignee: Wilhelm H. Kullman Wikus Sagenfabrik
• Inventors: Kullmann, Jorg H., Fluhrer, Manfred
• Primary Examiner(s): Rada, Rinaldi I.
• Application Number:
  US08/265,515
• Time in Patent Office: 361 Days
• Field of Search: 83/661, 83/846, 83/847, 83/848, 83/849, 83/850, 83/676
• US Class Current: 83/846
• 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 61/121 Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet
• CPC Class Codes: Y10T 83/9346 Uniformly varying teeth or tooth spacing
• CPC Class Codes: Y10T 83/9348 Undulating tooth arrangement
• CPC Class Codes: Y10T 83/9403 Disc type

Abstract

A saw blade having a basic body (1) and unset teeth (2₁, 2₂, etc.) having recurring cycles of teeth, each cycle having at least one group of teeth with at least three teeth, and where tooth height decreases from tooth to tooth while tooth width simultaneously increases. The teeth (2₁, 2₂, etc.) are formed symmetrically with respect to a longitudinal center plane (8) extending through the basic body (1). The effective cutting edges or cutting-edge sections (6₁, 12₁, 14₂, 12₂, etc.) of each tooth (2₁, 2₂, etc.) are formed by a jutting-out or protruding cutting edge, the inner section (6₁, 6₂, etc.) of which runs approximately perpendicularly with respect to the longitudinal center plane (8) and which is adjoined externally by a phase (7₁, 7₂, etc.) inclined toward the basic body (1) The widest tooth (2) in the group of teeth has an angle greater than 90 degrees formed between phase (7 ) and flank (10).

Claims

1. A saw blade, comprising:

a basic body (1) lying in a longitudinal center plane (8) and having an edge and including along its edge a series of spaced unset teeth (2), all of said teeth being formed symmetrically with respect to the longitudinal center plane of the basic body of the saw blade;

at least some of said teeth each including a cutting edge (5) having an inner section (6) which extends approximately at a right angle with respect to the longitudinal center plane of the basic body of the saw blade and adjoining phases (7) intersecting said inner section to the right and left of each inner section and inclined from said inner section to form phase angles (9) with respect to the cutting edge (5), and flanks (10) intersecting said phases on opposite sides of said longitudinal center plane each of which extends from a phase toward the basic body;

said teeth being of different heights and widths progressively from tooth to tooth in recurring groups of at least three teeth wherein the height of the teeth in each group decreases from tooth-to-tooth, while the width of each inner section for each tooth in the same group of teeth simultaneously increases from tooth-to-tooth, so that each tooth has an effective cutting edge formed along said inner section (6) and its adjoining phases (7) which protrudes a different distance from the longitudinal center plane with respect to the adjacent teeth in the group of teeth; and

wherein the widest tooth in each group of teeth has an angle greater than 90 degrees between its phase (7) and its flank (10).

2. The saw blade of claim 1, wherein said effective cutting edge further comprises that portion of the cutting edge which protrudes a different distance from the longitudinal center plane beyond the cutting edges of the adjacent teeth, and wherein the lengths of all of said said effective cutting edges is approximately equal.

3. The saw blade of claim 2, wherein said effective cutting edge further comprises that portion of the inner section and phases of said cutting edge which protrude beyond the cutting edges of said other teeth, and wherein that portion of the effective cutting edge which comprises the phases is at least as long as said inner section of the effective cutting edge.

4. The saw blade of claim 1, wherein each of said teeth further comprises a phase angle formed where each phase connects to said flanks, and where each of said phases for each of said teeth have equal phase angles with respect to a straight line perpendicular to said center plane.

5. The saw blade of claim 4, wherein said phase angle for each of said teeth is in the range between 20°

and 60°

.

6. The saw blade of claim 5, wherein said phase angle is 45°

.

7. The saw blade of claim 1, wherein each of said teeth further comprises a flank angle formed between the flanks of each of said teeth and a line parallel to said center plane, and wherein said flank angles of said teeth are in the range of between 3°

and 12°

.

8. The saw blade of claim 7, wherein each of said flank angles of said teeth are identical, and wherein each of said flanks on each side of each tooth lie along a common plane extending to and intersecting a common line perpendicular to said saw blade body.

9. The saw blade of claim 8, wherein said flank angle is 8°

.

10. The saw blade of claim 1, wherein each of said cutting edges further comprises a carbide tipped cutting edge.

11. The saw blade of claim 1, wherein each of said teeth are ground and are wider than said saw blade body.

12. The saw blade of claim 1, wherein each of said teeth in said group of said teeth linearly decrease in height, and linearly increase in width, from said first tooth to said last tooth.

13. The saw blade of claim 1, wherein said group of teeth has a recurring variable tooth pitch which reoccurs in said recurring cycle.