Abstract: The crank mechanism of the piston compressor comprises individual crank disks (5), which each support on their outer circumference a rolling bearing (6) for the bearing of a connecting rod (4). The crank disks (5) are pressed together to form a package by means of tensioning bolts (7). The crank case (1) is preferably closed off by a case cover (10), the inside of which is formed as a bearing mount for the crank mechanism. Assembly and disassembly of a crank mechanism of this type is particularly simple and efficient and can be undertaken by personnel who are not specially trained. In addition, special relubrication devices provide simple and error free servicing, and thus greater longevity.

Abstract: The device has a pedestal (3) that is fastened tightly to base (2). The pedestal has two receiving openings for screws as well as an arc-shaped slot (6) in a plate (4). An adjustable element (7) can be fastened to pedestal (3). This adjustable element (7) has two parallel slots (9,9') as well as a receiving opening for a screw. Depending on the placement of screws (11,11'), adjustable element (7) can be moved plane parallel to base (2) in slots (9,9') or swiveled within arc-shaped slot (6) at an angle to base (2).

Abstract: The piston of a piston-type machine has on its surface a heat-barrier layer of plastic material which is cast into a recess formed in the piston crown. A pouring means formlockingly enclosing the upper edge is put on the piston, held in a vertical position, to permit the recess to be overfilled with the material. The pouring means is removed after the material has hardened. Due to the shrinkage of material when the material hardens, the material and the upper edge form a flat surface on the piston.