Document Type and Number:
Japanese Patent JPS6350512
Kind Code:
B2
Abstract:
Pressure fluid operated percussion drilling machine comprising a frame (1) forming a cylinder space (2) for an axially movable percussion piston (3). The frame is provided with channels (4,7) connectable to a pressure fluid source (5) and to a pressure fluid container (8) respectively for pressurizing the cylinder space alternately on each side of the percussion piston in order to move it back and forth. The frame is also provided with means (12) for connection of a drilling rod (13) to the frame for directing strokes on the drilling rod by means of the percussion piston. A pressure fluid operated rotation mechanism (18) is mounted on the frame for rotating the drilling rod, which mechanism is connected to said channels for rotating the mechanism by means of a pressure fluid. The frame is provided with two outlet channels (7,19) terminating in the cylinder space at a distance from each other in the direction of movement of the percussion piston. One of said outlet channels is connected to the rotation mechanism and the other to the pressure fluid container so that the percussion piston distributes the pressure fluid displaced out from the cylinder space in a desired proportion between the fluid container and the rotation mechanism.
Inventors:
UNTO ATORA
YAATSUKO KUUSENTO
YAATSUKO KUUSENTO
Application Number:
JP22430584A
Publication Date:
October 11, 1988
Filing Date:
October 26, 1984
Export Citation:
Assignee:
TANPERA AB OY
International Classes:
B23B45/16; B25D9/12; B25D9/14; B25D16/00; E21B1/00; E21B1/26; E21B6/00