Low-noise impact screwdriver

Details Low-noise impact screwdriver Low-noise impact screwdriver

1995-06-01

1997-10-07

Hail, III, Joseph J.

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

173 936, 173 97, B25B 1900

Patent

active

056737580

ABSTRACT:
An improved structure of an impact screwdriver is provided which achieves a low-noise screw-driving operation. The impact screwdriver includes a clutch assembly for transmitting torque provided by a motor to a tool bit. The clutch assembly includes a toque-transmitting member, a torque-outputting member, and a clutch coil spring. The clutch coil spring is selectively wound around the torque-transmitting member and the torque-outputting member according to a rotational difference therebetween to establish torque transmission for providing the torque to the tool bit intermittently.

REFERENCES:
patent: 3331452 (1967-07-01), Wanner
patent: 3369615 (1968-02-01), Maffey, Jr. et al.
patent: 3450214 (1969-06-01), Bangerter et al.
patent: 3476192 (1969-11-01), Noerr, Jr.
patent: 4243129 (1981-01-01), Schoeps
patent: 5129465 (1992-07-01), Rahm
patent: 5139093 (1992-08-01), Lyon et al.

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