Auger bit with interlocking feed screw and cutting insert
AssigneeGreenlee Textron Inc.
InventorsWILLIAM NORDLIN, PETER CZYZEWSKI
Life of this patent
Estimating the term…
Abstract
An auger bit includes a shaft having a central axis, a cutting insert mounted to said shaft, and a feed screw that is separate from the cutting insert and which is mounted to the shaft. The cutting insert and the feed screw are engaged with each other. A single locking member, such as a set screw, secures the feed screw member to the shaft, and thereby secures the cutting insert to the shaft. If the feed screw or the cutting insert become worn, feed screw or the cutting insert can be replaced.
Claims20
An auger bit comprising:
- a shaft having a central axis;
- a cutting insert mounted to said shaft;
- a feed screw that is separate from the cutting insert, said feed screw mounted to said shaft, said cutting insert and said feed screw engaged with each other;
- and
- a single locking member securing the feed screw member to the shaft.
A shaft for a cutting tool comprising:
- a continuous land and flute extending from a leading end to a trailing end, and a shaft central axis extending between said leading end and said trailing end, a first passageway having a central axis angled relative to said shaft central axis, said first passageway at least partially passing through said shaft central axis, and a second passageway which is concentric with said shaft central axis.
A cutting insert for insertion into an auger bit shaft comprising:
- a generally cylindrical body with a central axis having a first end and a second end;
- cutting edges formed on said first end;
- and
- a groove having a central axis that forms a forty-five degree angle with said central axis of the body.
A feed screw for insertion into an auger bit shaft comprising:
- a generally conically shaped threaded portion having a first end, a second end and a central axis defined therebetween, said first end having a diameter which is less than a diameter at said second end;
- a stem extending from said second end of said threaded portion, said stem having a first end, a second end and a central axis defined therebetween, said stem having a diameter that is less than the diameter of said threaded portion at said second end, and a flat surface that forms a depression within the stem and that forms an acute angle with the central axis of the stem, the depth of the depression lessening as the depression progresses away from the threaded portion.
Dependencies are inferred from the claim text.