Back to results
US 7,246,976 B2Granted
Spade bit
AssigneeTextron Innovations Inc.
InventorWilliam F. Nordlin
Life of this patent
Estimating the term…
Abstract
An embodiment of a spade bit has straight grooves at a lead angle of 4 to 8 degrees placed on flat edges of the spade bit. In an alternative embodiment, a spade bit has two steps of straight grooves at a lead angle of 4 to 8 degrees placed on flat edges of the spade bit. In other alternative embodiments, a spade bit has tapered flat edge which have straight grooves at a lead angle of 4 to 8 degrees placed thereon. The straight grooves on the flat edges of the spade bits allow the spade bit to pull itself through the workpiece with a minimal amount of penetration. The flat edges of the spade bit may also have cutting surfaces for cleaning the hole and permitting the easy removal of the spade bit from the hole after drilling.
Claims37
A spade bit comprising:
- a blade portion having opposite first and second surfaces and a predetermined thickness of approximately between 0.085 and 0.095 inches, said predetermined thickness being defined by a distance between said first surface and said second surface, said blade portion further having opposite first and second side edges which extend from a front end of said blade portion to a rear end of said blade portion, at least a portion of said first and second side edges having grooves formed therein to define a grooved portion of said blade portion;
- and
- a shaft attached to said blade portion.
A spade bit comprising:
- a shaft having a forward end and a rear end, said rear end of said shaft being configured to be received and held by a tool;
- a spur having a forward end and a rear end, said forward end of said spur generally forming a point;
- and
- a blade portion having,
- a forward end and a rear end, said forward end of said blade portion being joined with said rear end of said spur, said rear end of said blade portion being joined with said forward end of said shaft,
- first and second spaced-apart surfaces, said first and second surfaces being generally parallel, said first and second surfaces being spaced apart by a predetermined thickness of approximately between 0.085 and 0.095 inches,
- first and second side edges which extend from said forward end of said blade portion to said rear end of said blade portion, and
- first and second portions, said first portion extending from said forward end of said blade portion to said second portion of said blade portion, said second portion extending from said first portion of said blade portion to said rear end of said blade portion, said first portion having grooves formed therein along said first and second side edges thereof, a distance from said first side edge to said second side edge of said first portion being less than a distance from said first side edge to said second side edge of said second portion.
5 more elements
A spade bit comprising:
- a shaft having a forward end and a rear end, said rear end of said shaft being configured to be received and held by a tool;
- a spur having a forward end and a rear end, said forward end of said spur generally forming a point;
- and
- a blade portion having,
- a forward end and a rear end, said forward end of said blade portion being joined with said rear end of said spur, said rear end of said blade portion being joined with said forward end of said shaft
- first and second spaced-apart surfaces, said first and second surfaces being generally parallel, said first and second surfaces being spaced apart by a predetermined thickness of approximately between 0.085 and 0.095 inches,
- first and second side edges which extend from said forward end of said blade portion to said rear end of said blade portion, and
- first and second portions, said first portion extending from said forward end of said blade portion to said second portion of said blade portion, said second portion extending from said first portion of said blade portion to said rear end of said blade portion, said first portion having grooves formed therein along said first and second side edges thereof, said first portion being stepped to define a first grooved section and a second grooved section, said first grooved section extending from said forward end of said blade portion to said second grooved section, said second grooved section extending from said first grooved section to said second portion of said blade portion, a distance from said first side edge to said second side edge of said first grooved section being less than a distance from said first side edge to said second side edge of said second grooved section, a distance from said first side edge to said second side edge of said second grooved section being less than a distance from said first side edge to said second side edge of said second portion.
5 more elements
A spade bit comprising:
- a shaft having a forward end and a rear end, said rear end of said shaft being configured to be received and held by a tool;
- a spur having a forward end and a rear end, said forward end of said spur generally forming a point;
- and
- a blade portion having,
- a forward end and a rear end, said forward end of said blade portion being joined with said rear end of said spur, said rear end of said blade portion being joined with said forward end of said shaft,
- first and second spaced-apart surfaces, said first and second surfaces being generally parallel, said first and second surfaces being spaced apart by a predetermined thickness of approximately between 0.085 and 0.095 inches,
- first and second side edges which extend from said forward end of said blade portion to said rear end of said blade portion, and
- first and second portions, said first portion extending from said forward end of said blade portion to said second portion of said blade portion, said second portion extending from said first portion of said blade portion to said rear end of said blade portion, said first portion having grooves formed therein along said first and second side edges thereof, said first portion being tapered such that a distance from said first side edge to said second side edge of said first portion proximate to said forward end of said blade portion is less than a distance from said first side edge to said second side edge of said first portion proximate to said second portion, a distance from said first side edge to said second side edge of said first portion proximate to said second portion being less than a distance from said first side edge to said second side edge of said second portion, and said second portion not having grooves formed therein along said first and second side edges thereof.
5 more elements
A spade bit comprising:
- a shaft having a forward end and a rear end, said rear end of said shaft being configured to be received and held by a tool;
- a spur having a forward end and a rear end, said forward end of said spur generally forming a point;
- and
- a blade portion having,
- a forward end and a rear end, said forward end of said blade portion being joined with said rear end of said spur, said rear end of said blade portion being joined with said forward end of said shaft,
- first and second spaced-apart surfaces, said first and second surfaces being generally parallel, said first and second surfaces being spaced apart by a predetermined thickness of approximately between 0.085 and 0.095 inches,
- first and second side edges which extend from said forward end of said blade portion to said rear end of said blade portion, and
- first, second and third portions, said first portion extending from said forward end of said blade portion to said second portion of said blade portion, said second portion extending from said first portion of said blade portion to said third portion of said blade portion, said third portion of said blade portion extending from said second portion of said blade portion to said rear end of said blade portion, said second portion having grooves formed therein along said first and second side edges thereof, each of said grooves defining a pair of adjacent crests and a root therebetween, said first side edge of said first portion being positioned between said crest and said root of the groove of said second portion along said first side edge thereof which is most proximate to said first portion, said second side edge of said first portion being positioned between said crest and said root of the groove of said second portion along said second side edge thereof which is most proximate to said first portion, said second portion being tapered such that a distance from said first side edge to said second side edge of said second portion proximate to said first portion of said blade portion is less than a distance from said first side edge to said second side edge of said second portion proximate to said third portion, a distance from said first side edge to said second side edge of said second portion proximate to said third portion being less than a distance from said first side edge to said second side edge of said third portion.
5 more elements
A spade bit comprising:
- a blade portion having,
- opposite first and second surfaces defining a predetermined thickness of approximately between 0.085 and 0.095 inches,
- means for cutting a hole through a workpiece, said cutting means including a spur, and
- means for pulling said blade portion through the hole of the workpiece said pulling means not being provided on said spur.
1 more element
Dependencies are inferred from the claim text.