Tool driving or impacting – Impacting devices – With means for rotating tool
Patent
1976-01-16
1977-08-02
Staab, Lawrence J.
Tool driving or impacting
Impacting devices
With means for rotating tool
173DIG4, B25D 900
Patent
active
040390330
ABSTRACT:
An hydraulically operated striking apparatus for driving a rock drill comprises a body having an axial, cylindrical, interior space with an inwardly protruding annular member. A cylindrical piston is positioned in the space in sliding contact with the protruding annular member, and the piston has a canal in its outer surface. The body, the annular member and the piston define two annular spaces and an annular distributing valve is caused to slide within one of the spaces under fluid pressure. The two spaces communicate with each other by means of the piston canal when the piston is in a first slidable position, and the protruding annular member prevents communication between the two spaces when the piston is in a second slidable position. The piston is provided with an axially disposed extension which, in combination with an outlet, serves to permit a third annular axial space to communicate with either an inlet or an outlet at all times. After the fluid under pressure has moved the distributing valve, it is conducted to a rotating hydraulic motor and drives the motor to rotate the apparatus.
REFERENCES:
patent: 1074116 (1913-09-01), Haeseler
patent: 1080880 (1913-12-01), Bayles
patent: 2457969 (1949-01-01), Anderson
patent: 3406763 (1968-10-01), Worman
patent: 3739863 (1973-06-01), Wohlwend
patent: 3866690 (1975-02-01), Lance et al.
patent: 3896889 (1975-07-01), Bouyoucos
patent: 3903972 (1975-09-01), Bouyoucos et al.
patent: 3965799 (1976-06-01), Juvonen et al.
OY Tampella AB
Staab Lawrence J.
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