Abstract: The invention is directed to an apparatus for breaking out deposits and lining from small areas of rotary kilns. The objective, on which the invention is based, is accomplished by an apparatus, which has a front functional element and a rear functional element, which is disposed axially at the thick end of the functional element, a working disk being provided, the protruding, radial, external points of which, constructed as two longitudinally acting double cutting teeth and two transversely acting working teeth, form a circular path in their motion. The conicity adjusters, which can be swung out, form an outer conicity line with the working disk and the contours of the front functional element. In functional vicinity of the working disk at the radial outer edge of the longitudinal ribs of the functional element, said functional element has a curve, on which the inner conicity lines impinge tangentially. To accommodate working elements, plug-in receivers are disposed behind the working disks.