SHANK ATTACHMENT STRUCTURE

摘要

A shank attachment structure for drilling systems capable of detachable engagement with a shank of a cutter to a tubular shank attachment hole with a single motion. The shank attachment structure includes a coolant supplying hole formed at a central portion of the body portion of an arbor; a valve body formed at a tip end portion of the coolant supplying hole and a sealing member disposed at a position of the coolant supplying hole for contacting the valve body to form a fluid-tight state. A first sleeve having a pressing portion is disposed in the shank attachment hole. The pressing portion of this sleeve contacts the valve body by a movement of the first sleeve to cause the valve body to separate from the sealing member. A valve body operating member is included in the structure for controlling the pressing portion to manage the separation of the sealing member.