Cutting by use of rotating axially moving tool – Processes – Bit detachable
Reexamination Certificate
2005-01-11
2005-01-11
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Processes
Bit detachable
C408S144000, C408S230000, C408S713000
Reexamination Certificate
active
06840717
ABSTRACT:
A rotatable tool includes a shaft and a cutting head mounted thereto. The shaft defines a longitudinal axis of rotation and has a seat formed at a front end thereof which includes a first engagement surface. The cutting head is attached on the seat and includes a second engagement surface engaging the first engagement surface for longitudinally locking the cutting head to the shaft. The first and second engagement surfaces include respective first and second support surfaces which together form a planar interface, the interface defining a contact line when viewed longitudinally toward a front end of the tool. The contact line intersects an outer periphery of the cutting head at a point. The contact line extends from the point in a direction forming an acute angle with a radius that intersects the point. The contact line is disposed rotationally ahead of the radius with reference to rotation of the tool. The cutting head is attached to the shaft in response to relative rotation therebetween, whereupon respective longitudinal undercuts formed by the support surfaces engage one another, and a snap action occurs between respective portions of the engagement surfaces, to resist longitudinal and rotational dislodgement of the cutting head.
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Burns Doane , Swecker, Mathis LLP
Howell Daniel W.
Sandvik AB
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