Electric screwdriver

Details Electric screwdriver Electric screwdriver

2007-12-25

2007-12-25

Thomas, David B. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

C081S473000, C173S176000

Reexamination Certificate

active

11639154

ABSTRACT:
An electric screwdriver capable of reducing the reactive force produced on the occasion of a screw tightening work, etc. The electric screwdriver is designed to transmit the rotational driving force of a first motor to the bit through a bit holder, and it includes a flywheel rotatively driven by a second motor in the direction same as the direction of rotation of the bit holder, a brake generating a reactive force in the direction offsetting the reactive force transmitted from the bit to the body casing through the bit holder, by braking the flywheel, and a brake operating mechanism for operating the brake in response to the magnitude of the reactive force transmitted from the bit to the body casing through the bit holder.

REFERENCES:
patent: 1963855 (1934-06-01), Franz
patent: 3030839 (1962-04-01), Schadlich
patent: 3349651 (1967-10-01), Turnbull et al.
patent: 5848655 (1998-12-01), Cooper et al.
patent: 6836614 (2004-12-01), Gilmore

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