Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent
1978-10-03
1981-12-15
Mackey, Robert
Tool driving or impacting
Drive controlled by relative axial movement of tool
Drive motor controlled
173136, B25D 906, B25D 926
Patent
active
043054730
ABSTRACT:
A power control device for a pneumatic motor includes a pressure air supply flow limiting means in the form of a flow restriction having a diverging, pressure recovering outlet. The device also comprises a load responsive pressure relief means which is located downstream of the flow restriction and which is arranged to gradually release pressure air from the motor into the atmosphere in response to decreasing load applied on the motor. The device is effective in reducing the motor power in response to decreasing load upon the motor. The disclosed motor is a hammer piston impact tool, and the motor load responsive pressure release means comprises the forward end of the motor cylinder and passages on a thrust sleeve which receives the shank of a chisel and which is slidingly received in the cylinder. A motor load balancing spring is arranged to bias the motor load responsive pressure relief valve toward its open position, such that, upon increasing motor load, the spring yields and permits the motor load responsive pressure relief valve to move toward its closed position.
REFERENCES:
patent: 707735 (1902-08-01), Vaughan
patent: 887095 (1908-05-01), Johnson
patent: 1205140 (1916-11-01), App
patent: 3739862 (1973-06-01), Gunning
patent: 4074777 (1978-02-01), Andersson et al.
Atlas Copco Aktiebolag
Mackey Robert
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