초록 ▼

Alternator circuit arrangement (20) for controlling the electrical energization of multiple load devices such as two pump motors (41,42) on an alternating basis so as to maintain the level of a liquid (86) in a container (84) within a predetermined range. The alternator circuit arrangement (20) furt

Alternator circuit arrangement (20) for controlling the electrical energization of multiple load devices such as two pump motors (41,42) on an alternating basis so as to maintain the level of a liquid (86) in a container (84) within a predetermined range. The alternator circuit arrangement (20) further including an RC circuit (54) having a capacitor (62) for discharging through a normally closed switch (50b) which is opened during energization of the pump motors (41,42) so as to energize a bi-stable relay (52) which in turn interconnects alternate ones of the pump motors (41,42) to the alternator circuit (20) such that upon detection of the liquid (86) at an intermediate level (96) alternate ones of the pumps (41,42) are energized.

대표청구항 ▼

Control apparatus for alternately operating one of first and second electrical load devices; comprising: (a) first switch means, second switch means, and third switch means to be closed and opened in predetermined sequences; (b) first circuit means for supplying electrical energy from a source to a

Control apparatus for alternately operating one of first and second electrical load devices; comprising: (a) first switch means, second switch means, and third switch means to be closed and opened in predetermined sequences; (b) first circuit means for supplying electrical energy from a source to a first relay means and one of said first and second electrical load devices through both said first and second switch means in series, the first relay means having normally open first relay contacts means, said normally open first relay contacts means being latched closed upon energization of said first relay means; (c) second circuit means for supplying electrical energy from the source through said first switch means and said normally open first relay contacts means to one of said first and second electrical load devices when the first relay means is energized; and (d) third circuit means for supplying electrical energy from the source through said first switch means and said normally open first relay contacts means to RC circuit means interconnected to bi-stable relay means by normally closed first relay contacts means, said normally closed first relay contacts means being latched open upon energization of said first relay means whereupon said bi-stable relay means is made to change states when said first switch means is opened, said bi-stable relay means in a first state interconnecting a first one of said first and second electrical load devices to said first circuit means, and in a second state interconnecting a second one of said first and second electrical load devices to said first circuit means.