Irrigation control system timing device for controlling watering cycle of a plurality of watering zones

Claim 1

An irrigation control system comprising: A. a plurality of electrical means for controlling fluid flow to a respective plurality of irrigation zones; B. a plurality of electrical branch circuits each of which is connected to a fluid flow control means for a respective zone; C. an automatic timing device for selectively energizing each of said fluid flow control means in accordance with a pre-selected program, including 1. motor, 2. a rotatable dial with positionally displaceable means thereon and having zones corresponding to the irrigation zones, said dial being controlled by the operation of said motor so as to assign equal predetermined time intervals of the program cycle to each of the dial zones; 3. a selector switch, having contact zones corresponding to said dial zones, said selector switch being controlled by the operation of said motor for sequentially rendering each of said electrical branch circuits capable of energization for said equal predetermined time intervals; 4. aNd means for independently varying the fluid flow within a particular predetermined time interval assigned to each of said dial zones, said means comprising a. another switch, and b. an actuator for said switch, said actuator being responsive to the positionally displaceable means on said dial for repeatedly effecting, within said predetermined time interval, alternate On and Off states for the fluid flow control means associated with a respective zone by controlling the energization of the corresponding one of said electrical branch circuits, said alternate On and Off states having a minimum time period equal to a unit sub-interval of said predetermined time interval.