IMPACT-ACTION AIR-OPERATED DEVICE WITH THROTTLE AIR CONTROL Russian patent published in 2008 - IPC E21C37/00 B25D9/14 

FIELD: engines and pumps, mining operations.

SUBSTANCE: device comprises a supply air chamber, a device cutting in the compressed feed into the supply air chamber, a hollow cylinder housing a striker separating the cylinder space into idle cycle and running cycle chambers, an accumulation chamber communicating continuously, via passageway, with the running cycle chamber and arranged on the cylinder end face on the said running cycle chamber side, a constantly open throttle operation chamber inlet channel, an outlet channel furnished in the cylinder side wall, a working tool with a tail. The aforesaid device has a barrel provided with an annular collar and a flow-through pressure augmentor chamber arranged on the idle cycle chamber side communicating continuously, via the cover throttle inlet channel, annular groove and the cylinder lengthwise channel, with the supply air chamber, and, intermittently, via the pressure augmentor radial channel and the cylinder annular groove, with the idle operation chamber. The striker is furnished with the throttling start channel. The aforesaid barrel bottom faces the cover and bears, by its annular collar, on the cover collar to form the supply air chamber, the distance from the pressure augmentor channel exit to the outlet channel being smaller than the striker length.

EFFECT: higher effect on the processed medium.

7 cl, 6 dwg