Torque control actuator

Details Torque control actuator Torque control actuator

1989-02-13

1989-10-24

Yost, Frank T.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

192150, B25B 2314

Patent

active

048755281

ABSTRACT:
A pneumatic tool has a torque control actuator which shuts off the tool upon the attainment of a predetermined operating torque. A wrap spring clutch which has a torque capacity at the operating torque has an input shaft and an output shaft. A first axially engageable element rotates with the output shaft and a second element can be axially engaged to rotate with the first element. A cam socket rotates with the clutch input shaft and cams on a cam surface of the first element in response to relative angular movements between the clutch input and output shafts. The cam socket is biased so as to move the first and second elements out of engagement and a pressure operated air valve is provided which moves the cam socket against its bias to engage the first and second elements when the tool is operated. When the operating torque is reached, the cam socket cams off a ledge of the cam surface to allow the air valve to move to a closed position where the tool is shut off. The tool operator then releases the pressure tending to close the valve and the cam socket bias returns the air valve to its initial axial position and cams the cam socket to its initial axial and angular positions to be ready for the next operation of the tool. A secondary clutch is also provided to protect against overloading the actuator components.

REFERENCES:
patent: 2964151 (1960-12-01), Eckman
patent: 3059620 (1962-10-01), Eckman
patent: 3082742 (1963-03-01), Vilmerding et al.
patent: 3242996 (1966-03-01), Wright et al.
patent: 3515251 (1970-06-01), Clapp
patent: 3766990 (1973-10-01), Eckman et al.
patent: 3811513 (1974-05-01), Wezel et al.
patent: 4154308 (1979-05-01), Goldsberry et al.
patent: 4631992 (1986-12-01), Eckman

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