Method and apparatus for shutting off a power screwdriver

Details Method and apparatus for shutting off a power screwdriver Method and apparatus for shutting off a power screwdriver

1983-03-22

1984-07-31

Rubinson, G. Z.

Electricity: motive power systems

Motor-reversing

Automatic and/or with time-delay means

318434, 318467, 318433, 318739, 363 63, H02P 122, H02H 7085

Patent

active

044632932

ABSTRACT:
A power screwdriver that is equipped with a spring coupling between the motor drive and the tool spindle, a signal that indicates that a certain value of torque has been overstepped, at which the screwdriver must be sopped, first causes reversal of the motor, but before the motor appreciably turns in the reverse direction, powers shut-off, allowing the motor to coast. After another brief interval, power is reapplied to the motor in the original direction, again briefly. In this way it is possible for the final shut-off to occur when the motor is stopped and the spring is unstressed, avoiding oscillations of the motor-spring system. A triac bridge circuit makes possible quick reversals and brief applications of power. In such a bridge circuit, precautions must be taken to be sure one pair of triacs is extinguished before the other pair is ignited.

REFERENCES:
patent: 3008074 (1961-11-01), Gregory
patent: 3124732 (1964-03-01), Dupy
patent: 3551770 (1980-12-01), Isaacs
patent: 3803467 (1974-04-01), Dorr
patent: 3845373 (1974-10-01), Totsu et al.
patent: 3892146 (1975-07-01), Yasoshima
patent: 4056762 (1977-11-01), Schadlich
patent: 4158799 (1979-06-01), Cappel et al.
patent: 4175247 (1979-11-01), Klemm

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