Abstract: A cutter is provided for shaft and/or tunnel boring which comprises a divided cutter ring (10a, 10b) and a cutter body (8) with a recess (17). The cutter ring (10a, 10b) is secured in the recess (17) by a divided clamping ring (18). The clamping ring (18) is divided into at least two segments (18a, 18b) where each segment (18a, 18b) has two segment ends, with the result that when the clamping ring (18) is tightened, a number of pairs of opposite segment ends are formed. Furthermore, in a tightened condition, all the pairs of opposite segment ends are either connected to securing elements (20), or, in a tightened condition, at least one pair of opposite segments ends is connected with a hinged device (19) while the remaining pairs of opposite segment ends are connected to securing elements (20). The segments (18a, 18b) are tightened in the segments' (18a, 18b) circumferential direction.

Abstract: A cutter for a tunnel boring machine is equipped with a cutter body (1) with a slanting surface (2), a cylindrical contact surface (12) and a preferably tapered threaded portion with specially designed threads (6), a clamping ring (4) with threads adapted to the cutter body's threads with a slanting surface (5) with a groove (13) with a spring (14). The cutter has an undivided (3) or divided cutter ring (with segments 3a, 3b) with a cross section with slanting lateral surfaces (7, 8) in the foot and a cylindrical contact surface (11). The diameter of the cutter ring's cylindrical contact surface (11) has a clearance tolerance relative to the diameter of the cylindrical contact surface (12) of the cutter body.

Abstract: A cutter for a tunnel boring machine is equipped with a cutter body (1) with a slanting surface (2), a cylindrical contact surface (12) and a preferably tapered threaded portion with specially designed threads (6), a clamping ring (4) with threads adapted to the cutter body's threads with a slanting surface (5) with a groove (13) with a spring (14). The cutter has an undivided (3) or divided cutter ring (with segments 3a, 3b) with a cross section with slanting lateral surfaces (7, 8) in the foot and a cylindrical contact surface (11). The diameter of the cutter ring's cylindrical contact surface (11) has a clearance tolerance relative to the diameter of the cylindrical contact surface (12) of the cutter body.

Abstract: A cutter for a tunnel boring machine with cutter ring in two or more ring segments with a dovetail base, clamped to the cutter hub by a segmented clamping ring. The ring segments have a wedge shaped cross section, and are mounted in a groove. The segments are fastened to the hub by bolts. To facilitate loosening of the ring segments, the segments have a curvature different from that of the groove, so that an elastic force will be accumulated in the ring segments when they are mounted and the bolts are tightened. The curvature of the ring segments is either smaller or greater than that of the groove.

Abstract: A cutter head for drilling tunnels in rock includes a rotational body with a dove-shaped groove. A cutter ring formed of two substantially identical ring halves is clamped inside the groove by a clamping ring. Pins on the cutter ring extend into corresponding holes in the groove.