RICHARD ANTHONY CARPENTER
Engineers in Lebanon, PA

4008057, Feb 15, 1977

Nov 25, 1974

5/526990

Peter C. Gelfand - Lebanon PA
Richard A. Carpenter - Lebanon PA
Jerry F. Shoup - Palmyra PA

Envirotech Corporation - Menlo Park CA

B03C 366

55105

Electrically-activated shaking devices are arranged in modules to shake the electrodes of an electrostatic precipitator, each module corresponding to a different section of the precipitator. An operating system for the shaking devices includes a main distributor circuit that sends electrical signals to individual control circuits at each of the modules in sequence and at a relatively fast rate. Each control circuit has an adjustable timer that independently generates pulses at a relatively slow rate and a synchronizing circuit that generates an output signal only if it receives a signal from the timer followed by a signal from the main distributor. Each control circuit further includes a secondary distributor circuit that operates in response to the synchronizing circuit to activate the shaking devices in the associated module sequentially. An inhibit device operated by the synchronizing circuit prevents more than a single shaker from being activated at a time.