Abstract: An apparatus for grinding cutouts in the ends of pipes has a pair of pulleys which carry a grinding belt. One of the pulleys is a driving pulley for the belt and the other pulley is a shaping pulley which cooperates with the grinding belt to form the cutouts. A pipe clamp is located near, and is movable towards and away from, the shaping pulley. The shaping pulley is interchangeable in order to permit changes in cutout size. To this end, a stub projects from either end of the shaping pulley and supports a ball bearing. The ball bearings are receivable in carriers having U-shaped openings so that the shaping pulley can be installed and removed by pushing the bearings into the openings and pulling the bearings out of the openings.

Abstract: The invention relates to an apparatus for grinding recesses into the ends of tubular workpieces with a revolving, driven grinding belt, the front pulley of which apparatus has a diameter that corresponds to the diameter of the desired recess in a tube end, which pulley can easily be exchanged. Moreover, the pipe to be ground is disposed on a support assembly constructed with a clamping device, which can in turn be rotated to permit the grinding of such tube ends at angles other than 90.degree..

Abstract: The invention relates to a stone breaker having a frame supporting the work-table, having a support which is height-adjustable via setting means at its outer ends and is supported by the frame, and having knife-type blades extending parallel to the support, of which blades the counter-blade is supported by the frame and the other, in contrast to the support, is movable towards the counter-blade by means of a lever device, two eccentric drives with eccentric wheels being actuated by the lever device, both eccentric wheels having an outer toothed wheel rim and both outer toothed wheel rims being connected to each other via a movable rack.