Verfahren und Vorrichtung zum Betätigen eines Schlagwerkzeuges mittels Preßluft

摘要

The invention pertains to a process and device for actuating a percussive tool by means of a free piston (4) which is moved back and forth with compressed air, to a device for carrying out the process and to a hammer drill and a crushing bit on which this process and device are based. In the rotary piston compressor unit an inner (2) and an outer rotor (3) turn in an intermeshed rotation, a compression space and a suction space being formed alternately on radially offset sides of the inner rotor. The piston (4) moves axially in a hollow space of the inner rotor (2), which has front (2.1) and rear (2.2) control channels, which have axially offset apertures near the two ends of the hollow space of the inner rotor, with one aperture being turned to the compression space while the other is turned to the suction space and vice versa, so that the piston is moved back and forth as a result of the alternating directions of compression and suction.