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.

Abstract: Process and apparatus are provided for the removal of a deposit from the inner surface of a rotating cylinder having a horizontal or inclined longitudinal axis, which comprises introducing a body having a substantially symmetrical concavo-convex silhouette into the cylinder, the body being slidable in the axial direction in the cylinder either by the rotational movement of the cylinder or by means for axial propulsion of the slidable body within the cylinder, the surface of the body being in frictional engagement with the interior surface of the cylinder, the body being adapted to ride up to a point on the wall of the cylinder due to the frictional engagement, and then when the effect of the weight the body becomes greater than the frictional force of the engagement the body slides back in a generally radial direction toward the bottom of the cylinder while wearing away at least a part of the deposit within the cylinder by scraping action of the surface of the said sliding body against the interior wall of th

Abstract: A method for the partial or total removal of deposits and/or linings from rotary kilns by introduction of a conically shaped break off roller into the rotary kiln. The break off roller rotates together with the rotating kiln and this results in the roller impacting with its tools onto the interior surface of the kiln to break off parts thereof and to shake and vibrate the interior of the kiln to cause a collapsing thereof. The break off roller has a larger end and a smaller end and elongated guiding means for the disposition and guidance of cutting means and adjustable stabilizing means, and means for breaking and/or reversing the movement of the roller.