Circular saw blade

• US 4,432,264 A
• Filed: 08/03/1982
• Issued: 02/21/1984
• Est. Priority Date: 08/13/1981
• Status: Expired due to Term

• Current Assignee: Credo Tool Company
• Original Assignee: Omark Industries, Inc. (Oregon Tool Incorporated)
• Inventors: Scott, Lewis A.
• Primary Examiner(s): Schran, Donald R.
• Application Number:
  US06/404,850
• Time in Patent Office: 567 Days
• Field of Search: 83/835, 83/839, 83/838, 83/852, 83/854, 83/855
• US Class Current: 83/835
• CPC Class Codes: B23D 61/025 Details of saw blade body
• CPC Class Codes: B23D 61/04 with inserted saw teeth the teeth being individually inserted
• CPC Class Codes: B27B 33/12 Saw blades having inserted or exchangeably arranged bits or toothed segments
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor
• CPC Class Codes: Y10T 83/9365 Teeth having cutting edge parallel to blade surface
• CPC Class Codes: Y10T 83/9367 Teeth having cutting edge perpendicular to blade surface

Abstract

A circular saw blade having a plurality of circumferentially-spaced cutter teeth projecting radially outwardly therefrom. A portion of the periphery of the blade rises gradually as it progresses toward the front face of a tooth to provide a depth gauge to control depth of cut. A chip clearing channel extends radially inwardly along the body of the blade adjacent the front face of the tooth. A pocket formed in the body has edge margins which receive and support front and rear surfaces of a cutter tip.

Claims

1. A saw blade comprising a generally circular main body having a plurality of circumferentially-spaced cutter teeth arrayed about the periphery thereof, the outer ends of said teeth being positioned to describe an arc at a preselected first radius during operation of said blade, a tooth having a front surface facing in the direction of rotation of said blade during operation and a rear surface facing in the opposite direction, a peripheral portion of said body intermediate adjacent cutter teeth having a first region adjacent the rear surface of one tooth which is spaced radially outwardly from the center of rotation of the blade a second distance which is less than said first radius, with said peripheral edge extending from said first region toward the forward surface of the following tooth in a substantially continuous curve to terminate adjacent the forward surface of the following tooth at a second region which is spaced radially outwardly from said center of rotation a third distance which is intermediate said first radius and said second distance.

2. The blade of claim 1, wherein said peripheral portion extending from said first region to said second region is continuously convex.

3. The blade of claim 2, wherein said peripheral portion is a section of a circle having a center which is offset laterally from the center of rotation of the blade.

4. The blade of claim 1, which further comprises a chip clearance channel intermediate said front surface of a cutter tooth and the peripheral portion of the body leading said tooth, said channel extending generally radially inwardly from said peripheral portion.

5. The blade of claim 4, wherein said channel has a width measured circumferentially of said blade in a range of 0.030 inch to 0.100 inch.

6. The blade of claim 4, wherein a tooth comprises an element secured in a pocket defined in said body by edge margins of the body, which edge margins support the front and rear surfaces of said element against movement circumferentially of said body, and said channel comprises an identation in a side face of said blade adjacent the front surface of said tooth.

7. The blade of claim 6, wherein said indentation has a depth measured in a direction extending parallel to the axis of the blade in a range of 0.010 inch to 0.040 inch.

8. The blade of claim 4, wherein said chip clearance channel further comprises an enlarged bore extending through said body and spaced radially inwardly from said first region.

9. The blade of claim 1, wherein said main body portion is composed of a material of a first hardness and a cutter tooth is composed of a material of a hardness greater than said first hardness.

10. The blade of claim 1, wherein said first radius minus said third distance is in a range of 0.003 inch to 0.020 inch.

11. The blade of claim 1, wherein said third distance minus said second distance is in a range of 0.050 inch to 0.200 inch.

12. A saw blade comprising a generally circular main body having a plurality of circumferentially-spaced cutter teeth arrayed about the periphery thereof, the outer ends of said teeth being positioned to describe an arc at a preselected first radius from the center of rotation of the blade during operation of the blade, a tooth having a front surface facing in the direction of rotation of said blade during operation and a rear surface facing the opposite direction, a peripheral edge portion of said body intermediate adjacent cutter teeth defining a section of a circle having as its center a point which is offset radially of said blade from the center of rotation of the blade whereby said peripheral edge portion of said body forms a ramp surface which increases in distance from the center of rotation of the blade on progressing from a region adjacent the rear surface of one tooth toward the front surface of the following tooth, terminating at a maximum distance from said center of rotation which is less than said first radius to provide depth of cut control for said following cutter tooth.

13. The blade of claim 12, wherein said first radius minus said maximum distance from the center of rotation for said peripheral edge is in a range of 0.003 inch to 0.020 inch.

14. The blade of claim 12, wherein the region of maximum height of said ramp surface is spaced circumferentially of said blade no greater than 0.100 inches from the front surface of its associated cutter tooth.