Power screwdriver

Details Power screwdriver Power screwdriver

1981-04-15

1983-01-18

Kunin, Stephen G.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

173 935, 192 34, 192 56R, 81464, B25B 2102

Patent

active

043687849

ABSTRACT:
A power screwdriver has a drive motor and a tool holder arranged in a housing, a driving coupling including a driving coupling part driven by the motor and a driven coupling part, and a locking coupling arranged between the driving coupling and the tool holder, wherein the couplings are arranged so that when the tool holder is pressed against a screw the coupling parts of the driving coupling are connected with one another and torque from the motor is transmitted to the tool holder in a normal manner, when thereafter a limit torque is attained the locking coupling is overrun, the driving coupling part of the driving coupling is arrested, and the driven coupling part of the driving coupling is disconnected from the driving coupling part, and when the tool holder is pressed stronger against the screw which is difficult to screw in the driven coupling part displaces and follows the driving coupling part and is again connected with the latter so as to again provide for transmission of the torque from the motor to the tool holder.

REFERENCES:
patent: 3398611 (1968-08-01), Hahner
patent: 3616883 (1971-11-01), Sindelar
patent: 3710873 (1973-01-01), Aller
patent: 4088197 (1978-05-01), Roll et al.

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