Chucking reamer

Claim 1

A chucking reamer comprising: (a) a head having a flattened section, commencing on the shaft, the outer face of this section having essentially the shape of a secant; (b) a crescent-shaped recess, bounded by a curved face and a bottom face, running from the flattened section into the head; (c) an inner threaded hole provided in the head, running from the central area of the bottom face into which thread the shank of a fixing screw can be screwed; (d) two narrow, flush bases adjacent to the bottom face and on both sides of it, extending in the longitudinal direction of the shank substantially parallel with the fixing screw; (e) a support face adjacent to the bottom face and on both sides of it, extending in the longitudinal direction of the shank substantially perpendicular to the fixing screw, intersecting the flush bases and terminating in the front of the head together with one of the flush bases; (f) a centering hole in the front of the head; (g) two headless screw holes provided in the head substantially axially parallel with each other, positioned in the head according to a secant, and each opening in one of the flush bases; (h) headless screws screwed into the headless screw holes, each of which acts on a thrust piece whose area of thrust action is located in the region of the flush base and support face; (i) a cutter device having a flat lower side in contact with the support face and a back ridge in contact with the thrust pieces; (j) a crescent-shaped body in the crescent-shaped recess which is traversed by the fixing screw which retains the cutting device by means of the crescent-shaped body; (k) guide plates on the head; and comprising the improvements in which (l) the cutter device and the crescent-shaped body are in one piece and comprise a basic body of steel and a carbide cutter embedded in the basic body; (m) the fixing screw has a conical head and the crescent-shaped body has a conical recess; and (n) the geometrical longitudinal axis of the inner thread in the perpendicular direction to the cutting edge of the carbide cutter, and the plane of the bottom face, is eccentric in relation to the geometrical longitudinal axis of the conical recess, to the extent that when the basic body is to be moved to the smallest radius position, the shank of the fixing screw experiences a bending stress.