SUBMERSIBLE AIR HAMMER Russian patent published in 2012 - IPC E21B4/14 

FIELD: construction.

SUBSTANCE: submersible air hammer comprises a body, a striker forming chambers of forward and back travel with the body, and a valve air distribution device comprising a seat, a valve and a valve box, between which a metering chamber is formed. A circular throttling channel is formed between the seat and the valve, and with this channel the metering chamber is permanently connected with the forward travel chamber.

EFFECT: higher reliability due to provision of matched interaction of a valve and a striker by means of a permanent link of a valve air distribution device with a forward travel chamber.

2 dwg