Patent ID: 9079200
Filing Date: 2015-07-14
Classification: A01C,A01M,B05B

Abstract:
1. A backpack sprayer for selectively spraying one or more different chemicals, comprising: an enclosure including a plurality of chemical containers, each of said chemical containers having an outlet and being configured for containing and dispensing a chemical through said outlet; a harness attached to said enclosure for wearing backpack-style; a piston pump; a manifold assembly in fluid communication with said pump and each of said plurality of chemical containers, said manifold assembly including a plurality of spray valves for selecting any one of said chemical containers for dispensing a chemical contained therein through the corresponding outlet, and a plurality of backflush valves for selecting any one of said chemical containers for backflushing a dispensed chemical back into its respective container, each of said plurality of spray valves and each of said plurality of backflush valves comprising a two-way diverter valve having an input port and two selectable output ports, the input port of each of said plurality of spray valves being connected to the input port of a corresponding one of said plurality of backflush valves at a T-junction, and each said T-junction being connected to a corresponding one of said plurality of chemical containers; and a user-actuated spray wand connected by a T-junction with both said piston pump and manifold for spraying a dispensed chemical; the plurality of backflush valves being connected in series to the T-junction of the user-actuated spray wand, and the plurality of spray valves being connected in series to the piston pump.