Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1982-11-23
1984-12-25
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
307252UA, 323242, 323244, 361196, 361205, 361152, H01H 4732
Patent
active
044907710
ABSTRACT:
A control circuit arrangement for an electromagnetically operated power tool has a primary circuit including a solenoid and a semi-conductor switch, in series, the semi-conductor switch being capable of being triggered into a conducting state upon application of a trigger signal from a trigger control circuit. The trigger control circuit is actuated upon closure of a main trigger switch which is connected in series with the solenoid and the semi-conductor switch in the primary circuit for supplying current to the solenoid. Thus, should the semi-conductor switch fail due to a short-circuit, the power supply is disconnected from the solenoid the moment the operator releases the main trigger switch so protecting the solenoid. The semi-conductor switch is preferably a thyristor. An additional circuit is preferably provided for preventing the thyristor from firing a second time if the main switch remains closed. A delay circuit is also preferably provided for delaying firing of the thyristor until some time after the main switch has been closed to prevent arcing and damage to the main switch contacts.
REFERENCES:
patent: 3267337 (1966-08-01), Doyle
patent: 3903476 (1975-09-01), Gawron et al.
patent: 3950657 (1976-04-01), Sheng et al.
patent: 4306138 (1981-12-01), Tokunaga et al.
Huber Siefried
Merkator Manfred
Black & Decker Inc.
Eisenzopf Reinhard J.
Murphy Edward D.
Sherer Ronald B.
Weinstein Harold
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