Bandsaw blades for milling timber

• US 4,688,458 A
• Filed: 04/22/1985
• Issued: 08/25/1987
• Est. Priority Date: 08/30/1983
• Status: Expired due to Fees

• Current Assignee: Minister For Industry and Decentralisation For The State of New South Wales The C/Parliament House Macquarie St Sydney NSW Australia
• Original Assignee: Minister FRO Industry and Decentralisation of The State of New South Wales
• Inventors: Krilov, Alexandre
• Primary Examiner(s): YOST, FRANK
• Application Number:
  US06/741,669
• Time in Patent Office: 855 Days
• Field of Search: 83/835, 83/661, 76/112
• US Class Current: 83/661
• CPC Class Codes: B23D 61/12 Straight saw blades; Strap saw blades
• CPC Class Codes: B23D 63/20 Combined processes for dressing saw teeth, e.g. both hardening and setting
• CPC Class Codes: Y10T 83/9317 Endless band or belt type
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor

Abstract

A bandsaw blade for use in milling timber having in-line swaged teeth, wherein the cutting tip of each tooth, in front profile, is triangular in shape with a central apical point (30) and two side points (32, 34). Preferably, the apical angle (θ) is from 60° to 140°, with the base angles (γ) of the tip being equal to one another and lying from 20° to 60°, thus providing an elongate pentagon shape in front profile. Also, a dark blue temper band (50) may be curved so that its top is spaced below the apical point (30) by a distance of 0.5 to 1.3 times, preferably 0.6 to 1.2 times, the blade thickness.

Claims

1. A bandsaw blade for use in the milling of timber and which has in-line swaged teeth;

the swaged portion of each tooth being shaped as an elongate pentagon which blends uniformly into adjacent unswaged regions of the tooth, the swaged portion of each tooth having a front face which is substantially planar, a hook angle of 25°

to 35°

, a sharpness angle of 40°

to 45°

, a clearance angle of 15°

to 20° and

a cutting tip which, in front profile, is triangular in shape, the triangular cutting tip having a central apical angle falling within the range of 60°

to 140° and

base angles falling within the range of 20°

to 60°

, and is hardened to a hardness level falling within the range of 900 to 920 DPN.

2. The bandsaw blade as claimed in claim 1 wherein each tooth is hardened in a manner such that a dark blue temper band is present with an uppermost portion of the band being spaced below the apical point by a distance corresponding to 0.5 to 1.3 times the blade thickness.

3. The bandsaw blade as claimed in claim 1 wherein each tooth is hardened to such an extent that a dark blue temper band is present with an uppermost portion of the band being spaced below the apical point of the tooth by a distance corresponding to 0.6 to 1.2 times the blade thickness and wherein the temper band is curved such that it is spaced from side points of the tooth by a distance corresponding to 0.2 to 1.2 times the blade thickness.