Circuit arrangement for electrical tool with clutch

Details Circuit arrangement for electrical tool with clutch Circuit arrangement for electrical tool with clutch

1984-07-11

1985-12-03

Shoop, Jr., William M.

Electricity: motive power systems

Limitation of motor load, current, torque or force

318261, 318375, 318446, 318447, 192 0034, H02K 2368, F16D 2300

Patent

active

045568316

ABSTRACT:
In an electrical tool having a clutch for adjusting rotational torque of the driven shaft, a limit switch of double-throw type is used for detecting the state of the clutch, and a capacitor is arranged to be charged via the limit switch. In one embodiment of the instant invention, the capacitor is normally discharged and is charged when the clutch assumes a disengaged state, thereby producing a trigger pulse used for making a short circuit for the motor only when the capacitor is not fully charged. In another embodiment, the capacitor is normally charged, and is discharged when the clutch assumes a disengaged state, thereby producing a trigger pulse used for making a short circuit for the motor. With this arrangement a switching circuit provided for making the short circuit for the motor is effectively prevented from making the short circuit when a power switch is turned on irrespective of the state of the clutch.

REFERENCES:
patent: 3651389 (1972-03-01), Ito et al.
patent: 3875487 (1975-04-01), White
patent: 4354147 (1982-10-01), Klaussner

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