Patent attributes
A spray assembly for applying a fluid material to a surface includes a first spray bar and a second spray bar, each of which is mounted for movement along an axis. Each spray bar includes a plurality of nozzles, each of which is associated with a valve that can be opened or closed. Each nozzle is adapted to dispense a fluid material in a defined spray pattern onto the surface. The nozzles are spaced along the length of the spray bar to which they are attached and disposed above the surface so that the spray pattern from any nozzle on a spray bar does not overlap the spray pattern of a longitudinally adjacent nozzle. The assembly also includes a source of fluid material, and a fluid circuit through which fluid material may be supplied to each of the nozzles. Components of the assembly are also provided for intercepting at least a portion of the spray from a nozzle of the second spray bar to prevent the spray pattern from such nozzle from overlapping with the spray pattern from a nozzle of the first spray bar. A mechanism is also provided for closing the valve associated with a nozzle of the second spray bar. A preferred embodiment of the invention includes a first spray bar having a plurality of nozzle sets and a second spray bar having a plurality of nozzle sets, and a tack application controller for selectively opening and closing the valves associated with the nozzles in each nozzle set depending on the travel speed of the paving machine.
