Low torque automatic screwdriver

Details Low torque automatic screwdriver Low torque automatic screwdriver

1977-10-25

1979-05-15

Hafer, Robert A.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

192150, B25B 2314

Patent

active

041543084

ABSTRACT:
A pneumatic powered screwdriver adapted for moderately high speed operation and automatic shutoff at relative low torque turning resistance. An axially disengageable clutch unit intermediately couples the motor drive to the output drive bit. Contained in the clutch unit is an improved shutoff and reset mechanism which is cam shifted radially in response to clutch disengagement for enabling air supply interruption to the motor and automatically and positively reset for enabling subsequent operation.

REFERENCES:
patent: 833867 (1906-10-01), Blake
patent: 1026153 (1912-05-01), Degner
patent: 1333228 (1920-03-01), Stuart
patent: 3766990 (1973-10-01), Eckman et al.
patent: 4071092 (1978-01-01), Wallace

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