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US 2019/0030620 A1Published application
Step bit
AssigneeGreenlee Textron Inc.
InventorsArthur Anton Piper, John Jeremiah Morton, Nalin Devalam, Robert Bruce Bentley
Life of this patent
Estimating the term…
Abstract
A step bit according to some embodiments includes a body including one or more flutes having a cutting edge configured to cut a hole in a workpiece, and a plurality of steps provided on the body. The steps progressively increase in diameter from a first distal step to a terminal proximal step. One or more of the steps have first and second lands. An outer diameter of the first land is less than the outer diameter of the second land. A length of the first land is less than a length of the second land.
Claims38
A step bit comprising:
- a distal end and a proximal end, and a central axis defined between the distal and proximal ends around which the step bit is configured to be rotated;
- a tip provided at the distal end, the tip including one or more cutting edges;
- a body extending from the tip, the body including one or more flutes having a cutting edge,
- a plurality of steps provided on the body from the tip to the proximal end, each step having a first land and a second land extending proximally from the first land, each first land having a length and a surface defining an outer diameter, each second land having a length and a surface defining an outer diameter, wherein in each step the outer diameter of the first land is less than the outer diameter of the second land, the lands progressively increasing in outer diameter as the steps progress from a first step at the distal end to a terminal step at a proximal end of the body, wherein in each step the length of the first land is less than the length of the second land, wherein the length of each first land is the same, and wherein the length of each second land is the same;
- and
- a shank extending proximally from the body.
3 more elements
A step bit comprising:
- a distal end and a proximal end, and a central axis defined between the distal and proximal ends around which the step bit is configured to be rotated;
- a tip provided at the distal end, the tip including one or more cutting edges;
- a body extending from the tip, the body including one or more flutes having a cutting edge,
- a plurality of steps provided on the body, each step having a first land and a second land extending proximally from the first land, each first land having a length and a surface defining an outer diameter, each second land having a length and a surface defining an outer diameter, wherein in each step the outer diameter of the first land is less than the outer diameter of the second land, the lands progressively increasing in outer diameter as the steps progress from a first step at the distal end to a terminal step at a proximal end of the body, wherein in each step the length of the first land is less than the length of the second land;
- a shank extending proximally from the body;
- and
- wherein the surface in each first land comprises a proximal surface, and each first land further comprises a distal surface which extends proximally from the proximal surface and is angled relative to the proximal surface, and a corner surface which extends proximally from the proximal surface, and
- wherein the surface in each second land comprises a proximal surface, and each second land further comprises a distal surface which extends proximally from the proximal surface of the second land and is angled relative to the proximal surface of the second land, and a corner surface which extends proximally from the proximal surface of the second land, and
- wherein in one or more of the steps, the proximal surface of the first land is angled at an angle of approximately 45 degrees relative to the distal surface of the first land, and the proximal surface of the second land is angled at an angle of approximately 45 degrees relative to the distal surface of the second land.
6 more elements
A step bit comprising:
- a distal end and a proximal end, and a central axis defined between the distal and proximal ends around which the step bit is configured to be rotated;
- a tip provided at the distal end, the tip including one or more cutting edges;
- a body extending from the tip, the body including one or more flutes having a cutting edge,
- a plurality of steps provided on the body, each step having a first land and a second land extending proximally from the first land, each first land having a length and a surface defining an outer diameter, each second land having a length and a surface defining an outer diameter, wherein in each step the outer diameter of the first land is less than the outer diameter of the second land, the lands progressively increasing in outer diameter as the steps progress from a first step at the distal end to a terminal step at a proximal end of the body, wherein in each step the length of the first land is less than the length of the second land;
- a shank extending proximally from the body;
- and
- wherein the surface in each first land comprises a proximal surface, and each first land further comprises a distal surface which extends proximally from the proximal surface and is angled relative to the proximal surface, and a corner surface which extends proximally from the proximal surface, and
- wherein the surface in each second land comprises a proximal surface, and each second land further comprises a distal surface which extends proximally from the proximal surface of the second land and is angled relative to the proximal surface of the second land, and a corner surface which extends proximally from the proximal surface of the second land, and
- wherein in one or more of the steps, each corner surface is radiused.
6 more elements
A step bit comprising:
- a distal end and a proximal end, and a central axis defined between the distal and proximal ends around which the step bit is configured to be rotated;
- a tip provided at the distal end, the tip including one or more cutting edges;
- a body extending from the tip, the body including one or more flutes having a cutting edge,
- a plurality of steps provided on the body, each step having a first land and a second land extending proximally from the first land, each first land having a length and a surface defining an outer diameter, each second land having a length and a surface defining an outer diameter, wherein in each step the outer diameter of the first land is less than the outer diameter of the second land, the lands progressively increasing in outer diameter as the steps progress from a first step at the distal end to a terminal step at a proximal end of the body, wherein in each step the length of the first land is less than the length of the second land;
- a shank extending proximally from the body;
- and
- wherein in two or more of the steps, the outer diameter of the second land is greater than the outer diameter of the respective first land by the same amount.
4 more elements
(canceled)
A step bit comprising:
- a distal end and a proximal end, and a central axis defined between the distal and proximal ends around which the step bit is configured to be rotated;
- a tip provided at the distal end, the tip including one or more cutting edges;
- a body extending from the tip, the body including one or more flutes having a cutting edge,
- a plurality of steps provided on the body, one or more of the steps having a first land and a second land extending proximally from the first land, each first land having a length and a surface defining an outer diameter, each second land having a length and a surface and defining an outer diameter, and one or more of the steps having a single land, each single land having a length and a surface and defining an outer diameter,
- the lands progressively increasing in outer diameter as the steps progress from a first step at the distal end to a terminal step at a proximal end of the body,
- wherein in each step having first and second lands, the outer diameter of the first land is less than the outer diameter of the second land,
- wherein in each step having first and second lands, the length of the first land is less than the length of the second land,
- wherein in each step having a single land, the length of the single land is about the same as the length of the second lands of the steps having first and second lands;
- and
- a shank extending proximally from the body.
7 more elements
A step bit comprising:
- a distal end and a proximal end, and a central axis defined between the distal and proximal ends around which the step bit is configured to be rotated;
- a tip provided at the distal end, the tip including one or more cutting edges;
- a body extending from the tip, the body including one or more flutes having a cutting edge,
- a plurality of steps provided on the body, one or more of the steps having a first land and a second land extending proximally from the first land, each first land having a length and a surface defining an outer diameter, each second land having a length and a surface and defining an outer diameter, and one or more of the steps having a single land, each single land having a length and a surface and defining an outer diameter,
- the lands progressively increasing in outer diameter as the steps progress from a first step at the distal end to a terminal step at a proximal end of the body,
- wherein in each step having first and second lands, the outer diameter of the first land is less than the outer diameter of the second land,
- wherein in each step having first and second lands, the length of the first land is less than the length of the second land,
- wherein in each step having a single land, the length of the single land is greater than the length of the second lands of the steps having first and second lands;
- and
- a shank extending proximally from the body.
7 more elements
Dependencies are inferred from the claim text.