AIR PERCUSSION DEVICE WITH THROTTLE AIR DISTRIBUTION Russian patent published in 2008 - IPC B25D9/04 E21B1/30 

FIELD: engines and pumps.

SUBSTANCE: air-operated device incorporates an air line chamber, a hollow cylinder with its side wall furnished with outlet channels, a striker arranged in the said hollow cylinder and dividing it into idling and operating chambers, a cover, a barrel, a pipe with always-open throttle channel and an operating tool. The inlet throttle channel communicates the air line chamber with the idling chamber. A non-through boosting chamber is arranged in the cylinder wall on the idling chamber side. The striker is furnished with inner and outer chambers-grooves representing an alternating ledges and recesses their outline being formed by straight or curvilinear lines and with a bypass channel for the inner and outer chambers-grooves to intercommunicate. The aforesaid pipe side surface is furnished with a radial channel representing a vertical slot to intermittently communicate the said chambers-grooves in the striker with the pipe inlet throttle channel. The latter incorporates a cut-in channel-throttle arranged on the tool side.

EFFECT: higher efficiency impact on medium being processed.

2 dwg