Torque adjusting device for power driven rotary tools

Details Torque adjusting device for power driven rotary tools Torque adjusting device for power driven rotary tools

1987-08-05

1989-04-25

Watts, Douglas D.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

173163, 464 39, 81473, B25B 2314

Patent

active

048238856

ABSTRACT:
A power driven rotary tool includes a housing and an electric motor mounted within the housing. A transmission shaft is rotatably supported by the housing, and a drive gear is idly supported by the transmission shaft and is operatively connected to the electric motor. A clutch is provided being engageable with the drive gear, and is rotatably and axially movably supported by the transmission shaft. A slider is axially movably fitted on the transmission shaft, and a spring is operatively connected to the slider for urging the clutch toward the drive gear. A manually-rotatable selector ring is provided and is attached to the housing. The slector ring includes a cam face curved along the peripheral edge thereof and having a plurality of steps formed in a direction axially of the transmission shaft so as to displace the slider by stages in the axial direction for adjusting the amount of compression of the spring.

REFERENCES:
patent: 2857997 (1958-10-01), Graybill
patent: 3809168 (1974-05-01), Fromm

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