Patent ID: 8210911

Claim:
A casing brake comprising a brake ring; inner and outer shells between which the brake ring is tensioned; a locking element provided between the inner and outer shells, the locking element being connected to the inner or outer shell and establishing one of a positive or a frictional connection with the respective other shell at a locked position; an actuating device for eliminating the one of the positive or the frictional connection; and at least one of (a) through (e), as follows: (a) wherein the position which the inner and outer shells occupy relative to one another in the axial direction can be adjusted by means of a thread such that the tension of the brake ring can be adjusted by rotating the inner and outer shells relative to one another, such rotation of the inner and outer shells relative to one another being excluded at the locked position, (b) wherein the locking element is provided with a portion which, when occupying the locked position, applies pressure to a friction area provided in the respective inner or outer shell, a frictional connection being thereby established between the portion and the friction area, (c) wherein the locking element is provided with a portion which lockingly engages a recess formed in one of the inner or outer shell, thereby establishing a positive connection, wherein a plurality of recesses is uniformly distributed over the circumference of the inner or outer shell, (d) wherein the inner shell projects beyond the outer shell and has provided therein an opening through which the actuating device is exposed, and (e) wherein the inner shell projects beyond the outer shell and at least one sight opening is provided.