Pressure fluid operated percussion drilling machine provided with a rotation mechanism

A pressurized fluid operated percussion drilling machine comprising

• a frame forming a cylinder space for slidable engagement with a percussion piston,
• the percussion piston movable axially in the cylinder space in return and percussion directions,
• an inlet channel and a first outlet channel located within the frame, the inlet channel and the first outlet channel being connectable to a pressurized fluid source and to a pressurized fluid container respectively to move the percussion piston in the return and the percussion directions by means of the pressurized fluid,
• a distributing valve adapted for controlling movement of the piston, the distributing valve axially movable in a space being independent from the cylinder space,
• means for attaching a drilling rod to the frame positioned as an extension of the cylinder space,
• a pressurized fluid operated rotational mechanism for rotating the drilling rod, said rotational mechanism being connectable to said cylinder space through a second outlet channel for rotating the rotational mechanism by means of the pressurized fluid discharging from said cylinder space,
• said cylinder space being divided by the movable percussion piston on two chambers, a first chamber being adjacent to said means for attaching the drilling rod to the frame and to one side of the movable percussion piston, a second chamber being defined by the other end of the movable percussion piston and a rear end of the frame,
• the first and the second outlet channels terminating in the second chamber, the second outlet channel being positioned in the second chamber at a predetermined distance from the first outlet channel in the return direction of the movement of the percussion piston.