Saw blade with feed limiter

Patent metadata

Field	Value
Publication number	US-9370834-B2
Application number	US-201313803588-A
Country	US
Kind code	B2
Filing date	Mar 14, 2013
Priority date	Mar 14, 2013
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

A saw blade including cutting teeth, having at least one of chip-limiters protruding from the teeth or secondary teeth in the gullets of the cutting teeth configured to mitigate the blade from over-feeding. The chip limiters and/or secondary teeth provide that only a limited portion of an object that the saw blade encounters during cutting falls below the cutting tips of the cutting teeth. The chip limiters and/or secondary teeth also assist the cutting teeth in cutting.

First claim

What is claimed is:

1. A saw blade comprising:
a blade body having a back edge, a cutting edge located on an opposite side of the blade relative to the back edge, the cutting edge defined by a plurality of cutting teeth, the plurality of cutting teeth further defining and a cutting direction of the blade, and a plurality of gullets each between successive cutting teeth, each tooth of the cutting teeth configured to cut a material to be cut at least when moved through the material in the cutting direction and defining a tip, a height thereof, at least one clearance surface extending from the tip in a direction opposite the cutting direction, a rake face on an opposite side of the tip relative to the at least one clearance surface and extending from the tip toward a respective one of said plurality of gullets, wherein said tips of the cutting teeth define the cutting edge, and a distance along the cutting edge between successive cutting teeth tips in the cutting direction defines a pitch thereof; and
a plurality of chip limiters, each projecting from a respective trailing tooth in the cutting direction for a first distance as measured along the cutting edge in the cutting direction from the tip of the respective trailing tooth to a tip of the chip limiter, wherein each chip limiter defines the tip, a height thereof, a relief surface extending from the chip limiter tip toward the rake face of the respective trailing tooth, and a chip limiter rake face located on the opposite side of the chip limiter tip relative to the relief surface and extending from the chip limiter tip toward the respective one of said plurality of gullets,
wherein:
the height of the tooth tip is greater than the height of the chip limiter,
the first distance is one or more of (i) within a range of about 22% to about 44% of the pitch and (ii) within the range of about 30% to about 40% of a second distance along the cutting edge, defined between the chip limiter tip and the tip of the respective preceding tooth in the cutting direction; and
each chip limiter is configured to (i) upon contact of an object with the respective trailing tooth, substantially prevent more than about 50% of the object from protruding beyond the cutting edge toward the respective one of said plurality of gullets and (ii) at least partially cut the material that contacts the chip limiter tip.

2. A saw blade as defined in claim 1 , wherein the first distance is within a range of about 27% to about 40% of the pitch.

3. A saw blade as defined in claim 1 , wherein the first distance is within the range of about 22% to about 44% of the pitch, and a height differential between the height of the tooth tip and the height of the chip limiter is within a range of about 8% to about 20% of the pitch.

4. A saw blade as defined in claim 3 , wherein the height differential is within a range of about 9% to about 18% of the pitch.

5. A saw blade as defined in claim 1 , wherein the cutting teeth tips comprise one or more of a coating, carbide, cermet or diamond material.

6. A saw blade as defined m claim 1 , wherein the chip limiter is configured to substantially prevent more than about 30% of an object having a diameter of at least about 40% of the pitch from contacting the respective trailing tooth.

7. A saw blade as defined in claim 1 , wherein the at least one clearance surface includes a primary clearance surface defining a primary clearance angle within the range of about 24 degrees to about 37 degrees.

8. A saw blade as defined in claim 7 , wherein the primary clearance surface spans a clearance surface distance along the cutting edge within the range of about 17% to about 44% of the pitch.

9. A saw blade as defined in claim 8 , wherein the clearance surface distance is within the range of about 25% to about 40% of the pitch.

10. A saw blade as defined in claim 1 , wherein the relief surface defines a relief angle within the range of about 20 degrees to about 37 degrees.

11. A saw blade comprising
a blade body having a back edge, a plurality of primary cutting teeth defining a cutting edge located on an opposite side of the blade relative to the back edge and a cutting direction, and a plurality of gullets each between successive primary cutting teeth, each tooth of the primary cutting teeth configured to cut a material to be cut at least when moved through the material in the cutting direction and defining a tip, a height thereof, at least one clearance surface extending from the tip in a direction opposite the cutting direction, a rake face on an opposite side of the tip relative to the at least one clearance surface and extending from the tip toward a respective one of said plurality of gullets, wherein said primary teeth tips define the cutting edge, a distance along the cutting edge between successive primary teeth tips in the cutting direction defines a primary pitch thereof; and
a plurality of first means for substantially preventing more than about 50% of an object in the material from protruding beyond the cutting edge toward the respective one of said plurality of gullets upon contact with the respective trailing primary tooth, the first means including second means for at least partially cutting the material that contacts the second means.

12. A saw blade as defined in claim 11 , wherein the first means comprises a chip limiter projecting from a respective trailing tooth in the cutting direction a first distance along the cutting edge as measured in the cutting direction from the tip of the respective trailing tooth to a chip limiter tip of the chip limiter, and the second means comprises the chip limiter tip defining a height thereof, and the chip limiter further defines a relief surface extending from the chip limiter tip toward the rake face of the respective trailing tooth, and a chip limiter rake face located on the opposite side of the chip limiter tip relative to the relief surface and extending from the chip limiter tip toward the respective one of said plurality of gullets,
wherein:
the height of the tooth tip is greater than the height of the chip limiter, and
the first distance is one or more of (i) within a range of about 22% to about 44% of the pitch and (ii) within the range of about 30% to about 40% of a second distance along the cutting edge, defined between the chip limiter tip and the tip of the respective preceding tooth in the cutting direction.

Assignees

• Irwin Ind Tool Co

Inventors

• Elliston Asif
• Korb William B
• Hampton Stephen A
• Fosberg Douglas K
• Kalomeris Charles E

Classifications

• B23D61/1218 Primary

  with a depth limiter on the saw blade · CPC title

• B23D61/121 Primary

  Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet · CPC title

• Y10T83/9319

  Toothed blade or tooth therefor · CPC title

• Y10T83/9348

  Undulating tooth arrangement · CPC title