Roller twist drill
AssigneeKennametal Inc.
InventorMichael R. McCormick
Life of this patent
Estimating the term…
Abstract
A drill comprises a drill body and a removable tip. The drill body has a main body portion, a thread, and a reduced diameter portion between the main body portion and the thread. The removable tip has a main body portion and a thread that is adapted to engage the thread of the drill body. One of the threads is an internal thread within a connection bore. The other thread is an external thread extending from a shaft. The internal thread is defined by a front face, a rear face, and a radial surface extending between the front and rear faces. The external thread is also defined by a front face, a rear face, and a radial surface extending between the front and rear faces. The shaft is adapted to be inserted in the connection bore and rotated to engage the internal and external threads with one another.
Claims25
A drill comprising:
- a drill body having a main body portion, a thread, and a reduced diameter portion between said main body portion and said thread;
- and
- a removable tip having a cutting tip and a thread that is adapted to engage said thread of said drill body,
- wherein one said thread is an internal thread in a connection bore and the other one of said threads is an external thread extending from a shaft,
- said internal thread being defined by a front face, a rear face, and a radial surface extending between said front face and said rear face,
- said external thread being defined by a front face, a rear face, and a radial surface that extends between said front face and said rear face, and
- said shaft being adapted to be inserted in said connection bore and rotated to engage said internal and external threads.
Dependencies are inferred from the claim text.