Fluid-pressure operated tools

Details Fluid-pressure operated tools Fluid-pressure operated tools

1983-11-30

1986-06-03

Meister, James M.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

173163, B23P 1900

Patent

active

045924309

ABSTRACT:
A tool has a housing, a reversible fluid-pressure operated rotary motor which is arranged to drive a bit holder via reduction gear boxes and a clutch which is designed to slip at a predetermined torque. When a trigger is pressed, pressure air is delivered via a valve to the motor, and in a first position of the valve the motor is driven in a forward direction. When the predetermined torque is reached, the clutch slips and displaces an actuator which opens another valve. This in turn creates a pressure differential across the valve which causes it to move to its second position in which pressure air is delivered to the motor to drive it in the reverse direction. When the trigger is released, the valves return to their original positions.

REFERENCES:
patent: 3791459 (1974-02-01), Workman
patent: 4154308 (1979-05-01), Goldsberry et al.

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