F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
342/38
F04B 17/04 (2006.01) F04B 35/04 (2006.01)
Patent
CA 1278361
ABSTRACT OF THE DISCLOSURE The present invention provides a control circuit for periodically energizing the solenoid coil of an electromagnetic actuator comprising an electronic timer circuit having a first and second control input terminal, a control output terminal and a signal output terminal; a capacitance connected between said first and second control input circuits and a common ground; a serially connected variable resistance and first diode connected between a source of electrical power and said capacitance for charging said capacitance at a rate determined by the resistance value of said variable resistance; a second diode having a cath- ode connected to said control output terminal and an anode con- nected to the junction between said variable resistance and said first diode; a fixed resistance connected between said capaci- tance and said control output terminal for discharging said capacitance at a rate determined by said fixed resistance; and a power transistor connected in series with said solenoid coil between said source of electrical power and said common ground, the base of said power transistor being connected to said signal output terminal.
614389
Brown Ralph V.
Facet Enterprises Inc.
Marks & Clerk
LandOfFree
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