KEY FOR MOUNTING AND DISMOUNTING OF A CUTTING INSERT

摘要

A holder includes a seat which removably carries a cutting insert for chip removing machining. The seat can be widened by the manual application of a force to enable the insert to be replaced. The force is applied by a manually actuable key which includes a shaft and an expansion mechanism mounted on an end of the shaft. The expansion mechanism includes a plate which is mountable to the holder in a manner enabling a projection pin of the shaft to enter a slot which constitutes an extension of the insert seat. The portion of the pin entering the slot has an out-of-round cross sectional shape. By rotating the shaft relative to the plate, the pin rotates to widen the slot, and thus to widen the seat. Rotation of the shaft relative to the plate is terminated after a predetermined amount of rotation, in response to mutual engagement between stop surfaces disposed on the shaft and the plate, respectively.