Patent ID: 8656573

Claim:
A shrink-fit tool, comprising a tool and a toolholder, one of the tool and the toolholder having a male shank portion and the other one of the tool and the toolholder having a body portion including a female opening for receiving the shank portion, the female opening being adapted to change in size upon heating the body portion to receive the shank portion and upon cooling of the body portion to clamp the shank portion by an interference fit, the shrink-fit tool comprising a pin adapted to extend into the female opening in a direction lateral to an axis of the female opening for mechanically retaining the shank portion in the female opening, the shank portion comprising a lateral recess extending laterally to an axis of the shank portion, the shank portion comprising an axially extending recess, an end ( 49 ) of the axially extending recess being disposed at an end of the shank portion, and the lateral recess being disposed remote from the end of the shank portion and connected to and at least partially circumferentially offset from the axially extending recess, wherein the shrink-fit tool is part of a rotating tool arranged for cutting a workpiece when rotated in a first direction about the axis of the shank portion, wherein a recessed, curved transition region of constant depth is provided between the lateral recess and the axially extending recess, the lateral recess and the axially extending recess being of sufficient depth such that rotation of the shrink-fit tool in the first direction during a cutting operation tends to urge the pin into the lateral recess so that the shank portion is mechanically retained in the female opening and, when the shank portion is rotated relative to the female opening of the body portion in a second direction opposite to the first direction, the pin is adapted to be received in the axially extending recess so that the shank portion is adapted to be withdrawn from the female opening of the body portion.