Power screwdriver

Tool driving or impacting – Automatic control of power operated means – Drive means responsive to torque or speed condition

Patent

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Details

173 93, B23Q 500

Patent

active

053798511

ABSTRACT:
A power screwdriver disclosed includes a housing, a reversible motor, a screw-driving device, a transmitting shaft, and a handle. The screw-driving device includes a centrifugal clutch, a rotor and an engaging set. The shaft is connected to the motor at one end and to the rotor at the other end so as to transmit rotating power from the motor to the rotor. The screwdriver automatically switch screwing actions in accordance with the rotating speed thereof.

REFERENCES:
patent: 3904305 (1975-09-01), Boyd
patent: 4359107 (1982-11-01), Smith
patent: 4947939 (1990-08-01), Hang
patent: 5082066 (1992-01-01), Schoeps

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