Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1982-01-18
1984-03-06
Meister, James M.
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
173 935, 91 59, B25B 2314, B25B 2100, B23P 1906
Patent
active
044348584
ABSTRACT:
The air tool of this invention features a shut-off valve in a motor inlet passage with an air bias compartment at one end of the valve and a motor pressure compartment at an opposite end of the valve directly communicating with the inlet to the motor. The air bias compartment has adjustable air bleed means for selectively reducing the pressure in the air bias compartment from a predetermined line pressure to a desired operating pressure at a constant percentage less than the predetermined line pressure. To establish the predetermined line pressure of the air supplied to the motor and to the air bias compartment of the shut-off valve, a stall torque regulator is provided upstream of the shut-off valve. This regulator serves to maximize the flexibility of the tool by providing for the adjustment of the tool to a given range of pressure and torque at which the motor will shut off but without undesirably affecting the free running speed of the motor within that given range.
REFERENCES:
patent: 3373824 (1968-03-01), Whitehouse
patent: 3786873 (1974-01-01), Whitehouse
Meister James M.
The Stanley Works
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