Rotary and percussive devices
AssigneeA. F. Hydraulics Limited
InventorLionel Arthur Reynolds
Life of this patent
Estimating the term…
Abstract
A hydraulic rotary and percussive device, for example a hand-held hammer or a rock drill, comprises hydraulic reciprocatory percussive means and hydraulic rotary drive means. The means are connected in series hydraulically with the rotary drive means on the exhaust side of the reciprocatory percussive means. The rotary drive means comprise a drive motor actuated by an exhaust pressure pulse on the return stroke of the reciprocatory percussive means, a rotary bush in which a tool is received and a ratchet mechanism coupling the motor to the bush. Valve means are provided by which the rotary drive means can selectively be rendered operative or inoperative.
Claims9
A rotary and percussive device comprising means for holding a tool, hydraulic reciprocatory percussive means adapted to impact the tool and having an inlet and an exhaust outlet, said inlet being adapted for connection to a hydraulic pressure supply and the percussive means exhausing through the exhaust outlet at a lower pressure than the supply pressure, and hydraulic rotary drive means adapted to rotate the tool and connected in series hydraulically with said reciprocatory percussive means, said rotary drive means being operated by hydraulic fluid supplied from said exhaust outlet.
Dependencies are inferred from the claim text.