Patent ID: 8167055

Claim:
A percussion device actuated by a pressurized incompressible fluid, a supply of fluid to which is performed by a high-pressure fluid supply circuit and a low-pressure return circuit, wherein: a body of the device comprises a flow regulator, the flow regulator comprising a first calibrated orifice situated on the high-pressure fluid supply circuit, and a bore formed in the body of the device and in which there is mounted a slide, a first face of which is situated in a first chamber connected to the high-pressure fluid supply circuit upstream of the first calibrated orifice and a second face of which is situated in a second chamber connected to the high-pressure fluid supply circuit downstream of the first calibrated orifice, the bore accepting the slide of the regulator comprising an annular groove connected to the return circuit of the percussion device, the slide of the regulator is designed to connect the annular groove to the first chamber where the pressure difference across the first calibrated orifice increases beyond a predetermined value, so as to divert some of the fluid flow supplied by the high-pressure fluid supply circuit to the return circuits, the first face of the slide of the regulator is constantly subjected to the pressure upstream of the first calibrated orifice, and the second face of the slide of the regulator is constantly subjected to the action of a spring and to the pressure downstream of the first calibrated orifice.