Band saw blade

• US 6,681,674 B2
• Filed: 02/13/2002
• Issued: 01/27/2004
• Est. Priority Date: 02/23/2001
• Status: Active Grant

• Current Assignee: Bengt Emanuel Hakansson, William Hakansson
• Original Assignee: Bengt Emanuel Hakansson, William Hakansson
• Inventors: Hakansson, Bengt Emanuel, Hakansson, William
• Primary Examiner(s): Shoap, Allan N.
• Assistant Examiner(s): Hamilton, Isaac N
• Application Number:
  US10/076,699
• Publication Number:
  US 20020124708A1
• Time in Patent Office: 713 Days
• Field of Search: 838/35, 838/46, 838/53, 837/88, 836/61
• US Class Current: 83/661
• 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 83/707 By endless band or chain knife
• CPC Class Codes: Y10T 83/9317 Endless band or belt type
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor
• CPC Class Codes: Y10T 83/9346 Uniformly varying teeth or tooth spacing
• CPC Class Codes: Y10T 83/9362 Teeth having transversely curved cutting edge

Abstract

A saw blade with teeth has a tooth point with a tooth edge (E1, E2). A tooth face is on the front side of the tooth and a tooth back is behind the tooth edge. A tooth gullet (G1, G2) is defined as the space between the tooth edges of two adjacent teeth. The tooth edge (E1, E2) extends between a right hand tooth corner (A1, A2) and a left-hand tooth corner (B1, B2). A first tooth gullet, disposed between the tooth edge (E1) of a first tooth (T1) and the tooth edge (E2) of the next tooth (T2) is beveled. A sloping surface (S1) extends from the first tooth edge (E1) in the rear end of the first tooth gullet downwardly along the tooth face and to at least the tooth bottom.

Claims

1. A band saw blade with teeth having a tooth point with a tooth edge (E1, E2), a tooth face on a front side of the tooth as viewed in a direction of sawing, a tooth back behind the tooth edge, and a tooth bottom between the tooth face on each tooth and the tooth back on a next tooth in front of said each tooth, and tooth gullets, wherein a tooth gullet (G1, G2) is defined as a space between the tooth edges of two adjacent teeth, said saw blade having two planar sides;

a right hand side (R) and a left hand side (L) when the saw blade is viewed obliquely from above in the direction of sawing, wherein said tooth edge (E1, E2) extends between a right hand tooth corner (A1, A2) and a left hand tooth corner (B1, B2) with reference to said viewing direction, comprising the saw blade within a region of a first tooth gullet between the tooth edge (E1) of a first tooth (T1) and the tooth edge (E2) of the next tooth (T2) in front of said first tooth is beveled such that a saw blade surface (S1) within said region slopes towards the left hand side (L) of the saw blade forming an angle (β

) with said left hand side, a beveled region with a sloping surface (S1) extending from a first tooth edge (E1) in a rear end of the first tooth gullet to at least a beveled tooth bottom (J1), said region being bordered to the right by a first line (K1) which extends from a rear foot point defined by the right hand tooth corner (A1) on the first tooth edge (E1) to a front foot point (C) which borders on the right hand side of the saw blade in the region of the first tooth gullet, to the left of the border line against the left planar side (L) of the saw blade, and forwards by said first line and/or by the tooth edge (E2) of said next tooth (T2) when the front foot point of said first line lies on said next tooth edge;

that the saw blade, within a region of a second tooth gullet (G2) between a second tooth and a next tooth in front of said second tooth is beveled in the same way as in the first tooth gullet but instead to the right, and that the saw blade within the region of first and second tooth gullets between first or second teeth, on one hand, and teeth in front thereof, on the other hand, along a length of the saw blade are beveled in a mode alternating to the left and to the right in said first and second tooth gullets, the first tooth (T1) having a left beveled region that is beveled from the right hand side (R) down to the left hand side (L), the left beveled region extending from the tooth edge (E1) down a tooth face (F1) across the beveled tooth bottom (J1) so that the angle (β

) is formed relative to a horizontal plane (H).

2. A saw blade according to claim 1 wherein the top line of each tooth edge (E1, E2) is inclined in alternate directions in relation to each other, forming an angle (γ

) in relation to a horizontal plane (H), said angle (γ

) being between 1-15°

, preferably 2-10°

, more preferred about 3-8°

.

3. A saw blade according to claim 1 wherein a hook angle (alpha) of each tooth is between 1-15°

, more preferred 2-10°

, and most preferred about 3-8°

.

4. A saw blade according to claim 1 wherein each tooth face (F1, F2) forms an angle (f1) in relation to an imaginary, vertical perpendicular plane through the band saw blade, such that said angle (f1) is between 1-15°

, preferably 2-10°

, more preferred about 3-8°

, and in an alternating direction consecutively along the band saw blade.

5. A saw blade according claim 4 wherein the longitudinal edge line (K1) in first tooth gullets (G1) of the saw blade lies in the same plane as the right hand side (R) of the saw blade, while the longitudinal edge (K2) in second tooth gullets (G2) of the saw blade lies in the same plane as the left hand side (L) of the saw blade.

6. A saw blade according to claim 1 wherein the tooth backs (H1, H2) in said first and second tooth gullets are convex, while the tooth faces (F1, F2) are concave, wherein the tooth edge (E1, E2) lies in front of a rearmost point of the concave tooth face.

7. A saw blade according to claim 1 wherein the angle (β

) of the beveled saw blade surface in relation to a horizontal plane (H) is between 1° and

15°

, preferably between 2° and

10°

, and more preferred about 3-8°

.

8. A saw blade according to claim 1 wherein said first and second teeth are unset and unswaged.

9. A saw blade according to claim 1 wherein the tooth corners of the tooth edges of said first and second teeth lies in the same plane as the sides of the saw blade.

10. A saw blade according to claim 8 wherein the blade is completely void of set or swaged teeth.

11. A saw blade according to claim 1 wherein said first and second teeth are provided alternating directly after each other, repeatedly along the length of the saw blade.