Patent ID: 6966730
Filing Date: 2005-11-22
Classification: B23B,Y10T

Abstract:
1. A cutter to be attached to a shank attaching structure in which a lock member is disposed on an inner periphery of a shank attaching bore opening at a tip of an arbor so as to be radially outwardly retractable for removably fitting a shank provided at a base end of the cutter into the shank attaching bore of the arbor with one touch, characterized in that: a base end face of the shank of the cutter is configured to abut a lower end of a supporting portion constructed of a tip portion of a coil spring, the tip portion being formed of a wire wound with a winding pitch made substantially equal to the diameter of the wire forming the coil spring so as to allow the supporting portion to press the shank of the cutter toward the open side and restrain the lock member from protruding into the shank attaching bore.