Structural saw blade
First Claim
1. A saw blade, comprising:
- a cutting edge defined by a plurality of teeth spaced relative to each other, each tooth including;
a tip;
a rake face formed on one side of the tip;
a primary clearance surface formed on the opposite side of the tip relative to the rake face and defining a primary acute relief angle;
a secondary clearance surface formed on the opposite side of the primary clearance surface relative to the tip and defining a secondary acute relief angle that is less than the primary acute relief angle;
a tertiary clearance surface formed on the opposite side of the secondary clearance surface relative to the first clearance surface, and defining a tertiary acute relief angle that is greater than the primary and secondary relief angles;
a weld zone formed on the opposite side of the rake face relative to the tip and extending in an elongated direction of the blade from approximately one side of the tooth to the other; and
a rake face protrusion formed on the opposite side of the rake face relative to the tip and extending over one end of the weld zone, wherein the rake face protrusion projects outwardly relative to a plane defined by the rake face, the secondary and tertiary clearance surfaces project outwardly on the opposite side of the tooth relative to the rake face protrusion, and at least one of the secondary and tertiary clearance surfaces extends over the weld zone on the opposite side of the tooth relative to the rake face protrusion to thereby form an increased tooth thickness at the weld zone.
1 Assignment
0 Petitions
Accused Products
Abstract
A structural band saw blade is provided having a cutting edge defined by a plurality of teeth spaced relative to each other, and a back edge located on an opposite side of the blade relative to the cutting edge. Each tooth of the band saw blade defines a tip, a rake face formed on one side of the tip, a primary clearance surface formed on the opposite side of the tip relative to the rake face, a secondary clearance surface formed on the opposite side of the primary clearance surface relative to the tip, and a tertiary clearance surface formed on the opposite side of the secondary clearance surface relative to the first clearance surface. The primary clearance surface defines a first acute relief angle, the secondary clearance surface defines a second acute relief angle less than the first acute relief angle, and the tertiary clearance surface defines a tertiary acute relief angle greater than the first and second relief angles. A rake face protrusion is formed on the opposite side of the rake face relative to the tip, and extends over one end of a weld zone. The rake face protrusion projects outwardly relative to a plane defined by the rake face, and the secondary and tertiary clearance surfaces project outwardly on the opposite side of the tooth relative to the rake face protrusion. One or both of the secondary and tertiary clearance surfaces extends over the weld zone on the opposite side of the tooth relative to the rake face protrusion to thereby form an increased tooth thickness at the weld zone and prevent tooth strippage. The teeth of the saw blade define a variable level height and set.
99 Citations
42 Claims
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1. A saw blade, comprising:
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a cutting edge defined by a plurality of teeth spaced relative to each other, each tooth including;
a tip;
a rake face formed on one side of the tip;
a primary clearance surface formed on the opposite side of the tip relative to the rake face and defining a primary acute relief angle;
a secondary clearance surface formed on the opposite side of the primary clearance surface relative to the tip and defining a secondary acute relief angle that is less than the primary acute relief angle;
a tertiary clearance surface formed on the opposite side of the secondary clearance surface relative to the first clearance surface, and defining a tertiary acute relief angle that is greater than the primary and secondary relief angles;
a weld zone formed on the opposite side of the rake face relative to the tip and extending in an elongated direction of the blade from approximately one side of the tooth to the other; and
a rake face protrusion formed on the opposite side of the rake face relative to the tip and extending over one end of the weld zone, wherein the rake face protrusion projects outwardly relative to a plane defined by the rake face, the secondary and tertiary clearance surfaces project outwardly on the opposite side of the tooth relative to the rake face protrusion, and at least one of the secondary and tertiary clearance surfaces extends over the weld zone on the opposite side of the tooth relative to the rake face protrusion to thereby form an increased tooth thickness at the weld zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A saw blade, comprising:
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a cutting edge defined by a plurality of teeth spaced relative to each other, each tooth including;
a tip;
a rake face formed on one side of the tip;
a primary clearance surface formed on the opposite side of the tip relative to the rake face and defining a primary acute relief angle;
a weld zone formed on the opposite side of the rake face relative to the tip and extending in an elongated direction of the blade from approximately one side of the tooth to the other; and
first means formed on the opposite side of the rake face relative to the tip and extending over one end of the weld zone and projecting outwardly relative to a plane defined by the rake face for increasing the width of the tooth at the weld zone and improving the resistance to tooth stripping; and
second means projecting outwardly on the opposite side of the tooth relative to the first means and extending over the weld zone on the opposite side of the tooth relative to the first means for further increasing the width of the tooth at the weld zone and improving the resistance to tooth strippage. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A saw blade, comprising:
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a cutting edge defined by a plurality of teeth spaced relative to each other, each tooth including;
a tip;
a rake face formed on one side of the tip;
a primary clearance surface formed on the opposite side of the tip relative to the rake face and defining a primary acute relief angle;
a weld zone formed on the opposite side of the rake face relative to the tip and extending in an elongated direction of the blade from approximately one side of the tooth to the other; and
means formed on the opposite side of the rake face relative to the tip, extending over at least the end of the weld zone adjacent to the rake face, and projecting outwardly relative to a plane defined by the rake face for increasing the width of the tooth at the weld zone and improving the resistance to tooth stripping; and
wherein the plurality of teeth define a variable level height and set pattern. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. A saw blade, comprising:
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a cutting edge defined by a plurality of teeth spaced relative to each other, each tooth including;
a tip;
a rake face formed on one side of the tip;
at least one clearance surface formed on the opposite side of the tip relative to the rake face and defining at least one relief angle;
a rake face protrusion formed on the opposite side of the rake face relative to the tip, wherein the rake face protrusion defines a substantially curvilinear profile, projects outwardly relative to a plane defined by the rake face, and defines a surface area of maximum projection relative to said plane of the rake face, and wherein said surface area of maximum projection is spaced at a depth below a cutting plane of the tip of an unset tooth within the range of approximately 0.03 inch through approximately 0.1 inch. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42)
a primary clearance surface formed on the opposite side of the tip relative to the rake face and defining a primary acute relief angle;
a secondary clearance surface formed on the opposite side of the primary clearance surface relative to the tip and defining a secondary acute relief angle that is less than the primary acute relief angle;
a tertiary clearance surface formed on the opposite side of the secondary clearance surface relative to the first clearance surface, and defining a tertiary acute relief angle that is greater than the primary and secondary relief angles; and
a weld zone formed on the opposite side of the rake face relative to the tip and extending in an elongated direction of the blade from approximately one side of the tooth to the other; and
wherein the rake face protrusion extends over one end of the weld zone, the secondary and tertiary clearance surfaces project outwardly on the opposite side of the tooth relative to the rake face protrusion, and at least one of the secondary and tertiary clearance surfaces extends over the weld zone on the opposite side of the tooth relative to the rake face protrusion to thereby form an increased tooth thickness at the weld zone.
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40. A saw blade as defined in claim 35, wherein the rake face protrusion defines a thickness normal to a plane of the rake face within the range of approximately 0.005 inch through approximately 0.06 inch.
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41. A saw blade as defined in claim 35, wherein the teeth define a variable level height and set pattern.
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42. A saw blade as defined in claim 41, wherein the variable level height and set pattern is defined by a plurality of right set teeth set to the right of a plane of symmetry, and a plurality of left set teeth to the left of the plane of symmetry, and wherein a first plurality of the right and left set teeth are each set at a first acute angel relative to the plane of symmetry, and a second plurality of symmetry that is less than the first acute angel.
Specification