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US 5,467,837 AGranted
Rotary drill bit having an insert with leading and trailing relief portions
AssigneeKennametal Inc.
InventorsThomas R. Miller, Daniel C. Sheirer
Life of this patent
Estimating the term…
Abstract
A roof drill bit having a tool body with a cutting insert brazed thereto. The cutting insert has opposite leading and trailing face portions joined by a side surface which has a leading side relief portion adjacent the leading face portion and a trailing side relief portion adjacent the trailing face portion. The trailing side relief portion, which extends from the leading face portion a distance equal to between about one-third to two-thirds the thickness of the insert, has a greater relief angle that the leading side relief portion, which extends from the trailing face portion a distance equal to between about one-third to about two-thirds the thickness of the insert.
Claims30
A roof drill bit comprising:
- a tool body having a cutting insert affixed thereto, said cutting insert having one face, an opposite face, and a side surface joining said one face and said opposite face;
- said side surface having a leading side relief portion adjacent to the one face and a trailing side relief portion adjacent to the opposite face, said leading side relief portion being relieved at an angle so that the interior angle between the one face and the leading side relief portion is less than 90 degrees, said trailing side relief portion being relieved to a greater degree than said leading side relief portion;
- and
- said leading side relief portion extending from the one face a distance of between about one-third to about two-thirds the thickness of the cutting insert, and said trailing side relief portion extending from the opposite face a distance of between about one-third to about two-thirds the thickness of the cutting insert.
1 more element
A roof drill bit comprising:
- a tool body having a cutting insert affixed thereto, said cutting insert having one face, an opposite face, and a side surface joining said one face and said opposite face;
- said side surface having a leading side relief portion adjacent to the one face and a trailing side relief portion adjacent to the opposite face, said trailing side relief portion being relieved to a greater degree than said leading side relief portion;
- and
- said leading side relief portion extending from the one face a distance of between about one-third to about two-thirds the thickness of the cutting insert, and said trailing side relief portion extending from the opposite face a distance of between about one-third to about two-thirds the thickness of the cutting insert, wherein the side surface further includes a mediate side relief portion between the leading side relief portion and the trailing side relief portion, and said mediate side relief portion being relieved at an angle that is greater than the angle of relief of the leading side relief portion and less than the angle of relief of the trailing side relief portion.
1 more element
A cutting insert for a roof drill bit, the insert comprising:
- one face, an opposite face, and a side surface joining said one face and said opposite face;
- said side surface portion having a leading side relief portion adjacent to the one face and a trailing side relief portion adjacent to the opposite face, said leading side relief portion being relieved at an angle so that the interior angle between the one face and the leading side relief portion is less than 90 degrees, said trailing side relief portion having a relief angle that is greater than the relief angle of said leading side relief portion;
- and
- said leading side relief portion extending from the one face a distance of between about one-third to about two-thirds the thickness of the cutting insert, and said trailing side portion extending from the opposite face a distance of between about one-third to about two-thirds the thickness of the cutting insert.
1 more element
A cutting insert for a roof drill bit, the insert comprising:
- one face, an opposite face, and a side surface joining said one face and said opposite face;
- said side surface portion having a leading side relief portion adjacent to the one face and a trailing side relief portion adjacent to the opposite face, said trailing side relief portion having a relief angle that is greater than the relief angle of said leading side relief portion;
- and
- said leading side relief portion extending from the one face a distance of between about one-third to about two-thirds the thickness of the cutting insert and said trailing side portion extending from the opposite face a distance of between about one-third to about two-thirds the thickness of the cutting insert, wherein the side surface further includes a mediate side relief portion between the leading side relief portion and the trailing side relief portion, and said mediate side relief portion being relieved at an angle that is greater than the relief of the leading side relief portion and less than the angle of relief of the trailing side relief portion.
1 more element
An excavating tool comprising:
- a tool body having a cutting insert affixed to the axially forward end thereof;
- said cutting insert having one face, an opposite face, and a pair of side surfaces joining said faces;
- each one of said side surface portions having a leading side relief portion and a trailing side relief portion, said leading side relief portion being relieved at an angle so that the interior angle between the one face and the leading side relief portion is less than 90 degrees, said trailing side relief portion having a relief angle greater than the relief angle of said leading side relief portion;
- and
- said leading side relief portion extending from the one face a distance of between about one-third to about two-thirds the thickness of the cutting insert, and said trailing side portion extending from the opposite face a distance of between about one-third to about two-thirds the thickness of the cutting insert.
2 more elements
An excavating tool comprising:
- a tool body having a cutting insert affixed to the axially forward end thereof;
- said cutting insert having one face, an opposite face, and a pair of side surfaces joining said faces;
- each one of said side surface portions having a leading side relief portion and a trailing side relief portion, said trailing side relief portion having a relief angle greater than the relief angle of said leading side relief portion;
- and
- said leading side relief portion extending from the one face a distance of between about one-third to about two-thirds the thickness of the cutting insert, and said trailing side portion extending from the opposite face a distance of between about one-third to about two-thirds the thickness of the cutting insert wherein the side surface further includes a mediate relief portion between the leading side relief portion and the trailing side relief portion, and said mediate relief portion having a relief angle that is greater than the relief angle of the leading relief portion and less than the relief angle of the trailing relief portion.
2 more elements
A method of drilling a hole in earth strata comprising the steps of:
- positioning a tool including a rotary drill bit having a cutting insert against the earth strata, the cutting insert having one face, an opposite face and a pair of side surfaces joining said faces;
- each one of said side surface portions having a leading side relief portion and a trailing side relief portion, said leading side relief portion being relieved at an angle so that the interior angle between the one face and the leading side relief portion is less than 90 degrees, said trailing side relief portion being relieved to a greater degree than said leading side relief portion;
- and said leading side relief portion extending from the one face a distance of between about one-third to about two-thirds the thickness of the cutting insert, and said trailing side portion extending from the opposite face a distance of between about one-third to about two-thirds the thickness of the cutting insert;
- and
- rotating the rotary drill bit at a speed between about 250 to 600 rpm and at a thrust of between about 100 to about 10,000 pounds for a time sufficient to drill the hole in the earth strata.
2 more elements
A cutting insert for a rotary drill bit, the insert comprising:
- one face, an opposite face, and a pair of side surfaces joining said faces;
- said one side surface portion having a leading side relief portion adjacent to the leading face portion and a trailing side relief portion adjacent to the trailing face portion, said leading side relief portion being relieved at an angle so that the interior angle between the one face and the leading side relief portion is less than 90 degrees, said trailing side relief portion having a relief angle that is greater than the relief angle of said leading side relief portion;
- and
- said leading side relief portion extending from the one face a distance of between about one-third to about two-thirds the thickness of the cutting insert, and said trailing side portion extending from the opposite face a distance of between about one-third to about two-thirds the thickness of the cutting insert.
1 more element
A roof drill bit comprising:
- a tool body having a cutting insert affixed thereto, said cutting insert having one face, an opposite face, and a side surface joining said one face and said opposite face;
- said side surface having a leading side relief portion adjacent to the one face and a trailing side relief portion adjacent to the opposite face, said trailing side relief portion being of an arcuate shape;
- and
- said leading side relief portion extending from the one face a distance of between about one-third to about two-thirds the thickness of the cutting insert, and said trailing side relief portion extending from the opposite face a distance of between about one-third to about two-thirds the thickness of the cutting insert.
1 more element
A cutting insert for a roof drill bit, the insert comprising:
- one face, an opposite face, and a side surface joining said one face and said opposite face;
- said side surface portion having a leading side relief portion adjacent to the one face and a trailing side relief portion adjacent to the opposite face, said trailing side relief portion being of an arcuate shape;
- and
- said leading side relief portion extending from the one face a distance of between about one-third to about two-thirds the thickness of the cutting insert, and said trailing side portion extending from the opposite face a distance of between about one-third to about two-thirds the thickness of the cutting insert.
1 more element
An excavating tool comprising:
- a tool body having a cutting insert affixed to the axially forward end thereof;
- said cutting insert having one face, an opposite face, and a pair of side surfaces joining said faces;
- each one of said side surface portions having a leading side relief portion and a trailing side relief portion, said trailing side relief portion being of an arcuate shape;
- and
- said leading side relief portion extending from the one face a distance of between about one-third to about two-thirds the thickness of the cutting insert, and said trailing side portion extending from the opposite face a distance of between about one-third to about two-thirds the thickness of the cutting insert.
2 more elements
Dependencies are inferred from the claim text.