US 2014/0260882 A1Published application

Saw blade with feed limiter

AssigneeIrwin Industrial Tool Company

InventorsAsif Elliston, William B. Korb, Stephen A. Hampton, Douglas K. Fosberg, Charles E. Kalomeris

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Abstract

A saw blade comprising 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.

Claims31

Dependent claims

A saw blade comprising:

a blade body having a back edge, a plurality of 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 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 gullet, 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 a first distance along the cutting edge from the tip of the respective trailing tooth, wherein each chip limiter defines a 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 said respective gullet,
wherein:
the height of the tooth tip is greater than the height of the chip limiter,
the first distance is at least one 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 said respective gullet and (ii) at least partially cut the material that contacts the chip limiter tip.

5 more elements

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 gullet, 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
each gullet having a secondary cutting tooth protruding therefrom toward the cutting edge, and defining a secondary cutting tooth tip and a height thereof,
wherein:
the height of the primary tooth tip height is greater than the height of the secondary tooth tip,
the secondary tooth tip is located a first distance along the cutting edge in the cutting direction from the tip of a respective trailing primary tooth, the first distance defining a secondary pitch within a range of about 20% to about 44% of the primary pitch;
and
the secondary cutting tooth is configured to (i) upon contact of an object with the respective trailing primary tooth, substantially prevent more than about 50% of the object from protruding beyond the cutting edge toward said respective gullet and (ii) at least partially cut the material that contacts the secondary tooth tip.

5 more elements

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 gullet, 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
each gullet having at least two secondary cutting teeth including a leading secondary cutting tooth having a leading secondary tooth tip defining a height thereof and a trailing secondary cutting tooth having a trailing secondary tooth tip define a height thereof protruding from the gullet toward the cutting edge,
wherein:
the height of the primary tooth tip is greater than the heights of the leading secondary tooth tip and the trailing secondary tooth tip,
the trailing secondary tooth tip is located a first distance along the cutting edge in the cutting direction from the tip of a respective trailing primary tooth, the first distance defining a secondary pitch, and
the leading secondary tooth tip is located a second distance along the cutting edge in the cutting direction from the tip of the trailing secondary tooth tip, the second distance defining a tertiary pitch,
each of the secondary pitch and the tertiary pitch is within a range of about 15% to about 35% of the primary pitch, and
the at least two secondary cutting teeth are configured to (i) upon contact of an object in the material with the respective trailing tooth, substantially prevent more than about 50% of the object from protruding beyond the cutting edge toward said respective gullet and (ii) at least partially cut the material that contacts the chip limiter tip.

6 more elements

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 gullet, 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 said respective gullet 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.

Dependencies are inferred from the claim text.

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Abstract

A saw blade comprising:

a blade body having a back edge, a plurality of 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 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 gullet, 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 a first distance along the cutting edge from the tip of the respective trailing tooth, wherein each chip limiter defines a 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 said respective gullet,
wherein:
the height of the tooth tip is greater than the height of the chip limiter,
the first distance is at least one 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 said respective gullet and (ii) at least partially cut the material that contacts the chip limiter tip.

5 more elements