Patent ID: 7836969

Claim:
A method for controlling a pressure fluid operated percussion device which allows a tool movable in a longitudinal direction of the tool with respect to a body of the percussion device to be installed therein, comprising: providing a working chamber and therein a transmission piston installed movably in the axial direction of the tool; suddenly compressing the tool in the longitudinal direction of the tool by a pressure of pressure fluid influencing the transmission piston such that a stress pulse is generated in the tool in the longitudinal direction of the tool and the stress pulse progresses through the tool into a material to be broken; providing a control valve which includes inlet and discharge channels for conveying pressure fluid to and from the percussion device and which also includes a movably installed switch element provided with channels for switching, via the channels of the switch element, the inlet channels and, similarly, the discharge channels to alternately feed pressure fluid into the working chamber to influence the transmission piston and, similarly, to discharge pressure fluid that influenced the transmission piston from the working chamber; and adjusting the length of the stress pulse by adjusting the time during which the pressure of the pressure fluid influencing the transmission piston and, therethrough, pressing the tool, influences the tool while the speed of the switch element remains constant.