Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1982-07-16
1984-05-15
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
227131, 307252UA, 318132, 361190, 361205, H01H 4732
Patent
active
044491611
ABSTRACT:
A one shot firing circuit for electrically powered tools is described which includes a manually operable normally open trigger switch connected electrically in series with a solenoid coil and an AC power source for controlling the supply of electrical power to both the firing circuit and the solenoid, such that when the trigger switch is open, the path of current flow to the solenoid coil is physically interrupted. The firing circuit also includes an SCR connected electrically in series with the trigger switch, the solenoid coil and the AC power source, for controlling the flow of current through the solenoid coil after the trigger switch has been closed. The firing circuit further includes a timing circuit connected to the gate of the SCR which is operable in response to the closing of the trigger switch to provide a predeterminable delay after the trigger switch is closed before enabling the SCR to conduct and permit a unidirectional current impulse to flow through the solenoid coil of sufficient magnitude to energize the solenoid. The timing circuit also operates to disable further unidirectional current impulses through the solenoid coil once the solenoid has been energized until a predeterminable delay after the trigger switch has opened.
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Moose Jr. Harry E.
The Black & Decker Manufacturing Company
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