Tool driving or impacting – Automatic control of power operated means – Drive means responsive to torque or speed condition
Patent
1994-03-14
1995-01-10
Smith, Scott A.
Tool driving or impacting
Automatic control of power operated means
Drive means responsive to torque or speed condition
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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