Screw tightening device

Details Screw tightening device Screw tightening device

1989-10-10

1990-12-25

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

173 12, B25B 23159

Patent

active

049794086

ABSTRACT:
A screw tightening device has a DC motor and a bit which is set to a screw. The DC motor is energized by a driving signal and rotates the bit. A torsion spring coupling is connected between the DC motor and the bit and absorbs an excessive torque produced therebetween. When the driving signal is cut, the motor is reversed under the returning force of the torsion spring coupling. A brake circuit causes a brake current which reduces the speed of the reverse rotation of the motor through the motor.

REFERENCES:
patent: 4502549 (1985-03-01), Hornung et al.
patent: 4535850 (1985-08-01), Alexander
patent: 4858312 (1989-08-01), Van Naarden

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