Electric wrench

Details Electric wrench Electric wrench

1990-10-31

1991-12-31

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Machine

81467, 81473, 192104R, 192 84PM, 192 84C, B25B 2100, F16D 2700

Patent

active

050761200

ABSTRACT:
An electric wrench includes a motor, an electromagnetically controlled clutch comprising electromagnet members and temporary-magnetizable members, a centrifugal control switch to de-energize the electromagnet members when the drive shaft connected to the motor spins at a predetermined rate of rotation and to energize the electromagnet members when the drive shaft spins slower than the predetermined rate of rotation, and a centrifugal swinging device for actuating the centrifugal controlled switch.

REFERENCES:
patent: 2618186 (1952-11-01), Mayer
patent: 3404767 (1968-10-01), Farnum
patent: 3783716 (1974-01-01), Saito
patent: 4418765 (1983-12-01), Mori et al.

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