Abstract: The apparatus consists of a hollow body wherein there is contained a striker which divides the space inside the body into a forward operating chamber and a rear exit chamber. The striker is provided with ports for admitting compressed air into the forward operating chamber and for allowing the emission of spent air from the chamber. The striker is also provided with an interior space, the rear end face of said striker being left open. Said hollow body includes passages and a pipe for placing said interior space of said striker in communication with a source of compressed, the pipe being positioned for longitudinal travel relative to the body.

Abstract: The present invention relates to pneumatic impact devices and can be used to the best advantage for making holes in compacted soils.The device is provided with a hollow casing which accommodates a stepped ram with the maximum-diameter step in its front part. This step has longitudinal channels which open at one end into a working chamber defined by the maximum-diameter step and the side walls of the casing and serving for receiving compressed air from the compressed air line, with the air moving the striker to impart a blow after which it is discharged through holes in the casing.

Abstract: A device has a cylindrical housing with a pointed front portion, which accommodates a striker separating the inner space of the housing to form a front and rear active chambers. The striker is provided with an open space at the rear end face thereof which mounts an air distributing branch connection threaded in the housing to be axially displaceable therein for reversing the device motion and adapted to admit compressed air to the active chambers and discharge it to the atmosphere therefrom thus reciprocating the striker which applies impacts to the housing. The air distributing branch connection has pipes arranged coaxially and forming longitudinal passages, of which the central passage serves to admit compressed air to the active chambers, while the annular passage between the pipes is used to discharge spent air from the active chambers.

Abstract: A power tool having a cylindrical housing accomodating a hammer and a two-step defining piston head, with central, rear and supplementary chambers in the housing, said head and supplementary chambers being constantly intercommunicated through a passage provided in the housing. The design of the power tool is aimed at minimizing vibrations of the housing and reduction of the forces applied to the handle during normal operation of the power tool.

Abstract: A percussive device comprising a housing with a pointed front end and a hammer piston accommodated in the housing to form a front working chamber therewith. The hammer piston is provided, in the rear portion thereof, with a cavity in permanent communication with a source of compressed air, the cavity serving as a rear working chamber. An airdistribution mechanism includes a tube mounted in the housing within the hammer piston cavity so that it is conjugated with the walls of the cavity, the piston having air passages therein positioned in such a manner that, during the reciprocation, the tube alternately communicates the front working chamber, via these passages, with either the rear working chamber or ambient atmosphere.

Abstract: An impact action mechanism of the type wherein the impact member is propelled by a combustible matter combusted in the combustion chamber of the mechanism. The impact action mechanism includes a hollow housing receiving therein a reciprocating impact member and a sleeve connected with the housing. The impact member has a tail portion receivable in the sleeve to define therewith, as the impact member moves into the sleeve, a closed combustion chamber. This combustion chamber communicates with the ambient atmosphere for exhaust of the combustion products and with a source of a combustible matter, respectively, through a pair of passages formed through the bottom of the sleeve. The impact action mechanism is small in size in the transverse section and offers a simple structure, which permits its utilization in the mining and construction industries, as well as for driving through holes in soil.