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A pressure sprayer includes an accumulator vessel adapted to hold a pressurized fluid therein and a container that is configured to hold a chemical concentrate. A motor in fluid communication with the accumulator vessel and the container is adapted to be driven by the pressurized fluid and to pump t

A pressure sprayer includes an accumulator vessel adapted to hold a pressurized fluid therein and a container that is configured to hold a chemical concentrate. A motor in fluid communication with the accumulator vessel and the container is adapted to be driven by the pressurized fluid and to pump the pressurized fluid and the chemical concentrate. A chamber is adapted to receive the chemical concentrate and the pressurized fluid from the motor to form a chemical solution. A nozzle is in fluid communication with the chamber.

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The invention claimed is: 1. A pressure sprayer, comprising: an accumulator vessel adapted to hold a pressurized fluid therein; a connector adapted to connect with a container holding a chemical concentrate; a motor in fluid communication with the accumulator vessel and the container when so connec

The invention claimed is: 1. A pressure sprayer, comprising: an accumulator vessel adapted to hold a pressurized fluid therein; a connector adapted to connect with a container holding a chemical concentrate; a motor in fluid communication with the accumulator vessel and the container when so connected, the motor comprising a first piston that is mechanically linked to a second piston, wherein the motor is adapted to be driven by the pressurized fluid and to continuously pump the pressurized fluid and the chemical concentrate; a chamber adapted to receive and combine the chemical concentrate and the pressurized fluid from the motor to form a chemical solution; and a nozzle in fluid communication with the chamber, wherein the first piston is driven by the pressurized fluid from the accumulator vessel, the first piston concurrently drives the second piston, and the second piston, when so driven, pumps the chemical concentrate from a connected container. 2. The pressure sprayer of claim 1, wherein the connector is adapted to releasably connect with the container. 3. The pressure sprayer of claim 1, wherein the chamber receives the pressurized fluid through a check valve that allows the pressurized fluid to flow from an outlet of the motor to the chamber but prevents the chemical solution from flowing from the chamber to the outlet of the motor. 4. The pressure sprayer of claim 1, wherein the motor is adapted to meter variable amounts of the chemical concentrate from a connected container. 5. The pressure sprayer of claim 1, further comprising at least one wheel that supports the pressure sprayer in rolling relation to a supporting surface, a tank for holding a fluid, and a pump powered by rotation of the at least one wheel to transfer fluid from the tank to the accumulator vessel, pressurizing the fluid in the accumulator vessel. 6. The pressure sprayer of claim 1, further comprising a mixture controller that operatively couples the first and second pistons, controlling the quantity of the chemical concentrate pumped by the second piston in response to movement of the first piston. 7. The pressure sprayer of claim 6, wherein the mixture controller can be adjusted to select the quantity of chemical concentrate to be pumped by the second piston in response to a given movement of the first piston. 8. The pressure sprayer of claim 7, wherein the mixture controller comprises a lever having a pivotal attachment point that is movable with respect to the lever to allow the location of pivotal attachment point to be selected to adjust the relative movement of each end of the lever with respect to the other end. 9. The pressure sprayer of claim 6, wherein the mixture controller comprises a rack and pinion system with the first and second pistons each operationally attached to first and second gear racks, respectively. 10. The pressure sprayer of claim 9, wherein the first and second gear racks are in operational contact with first and second transmission gears, respectively, arranged longitudinally on a common shaft and wherein the first and second transmission gears comprise a drive gear and a driven gear, respectively, wherein the driven gear is selectable through a gear transmission. 11. A pressure sprayer, comprising: a housing having a motor, a mixture controller, an accumulator vessel to hold a first fluid under pressures and a container to hold a second fluid disposed therein, the motor comprising a first piston and a second piston; wherein the first piston is adapted to be driven by the first fluid under pressure, the first piston is adapted to concurrently drive the second piston, the second piston is adapted to continuously pump a quantity of the second fluid, and the mixture controller operatively couples the first and second pistons for controlling the quantity of the second fluid pumped by the second piston. 12. The pressure sprayer of claim 11, wherein the first fluid in the accumulator vessel is pressurized by at least one of a fluid pump, a pressurized water system, or a pressurized air system. 13. The pressure sprayer of claim 12, wherein the at least one of the fluid pump, the pressurized water system, or the pressurized air system is disposed on or in the pressure sprayer. 14. The pressure sprayer of claim 11, wherein the mixture controller comprises a member operatively coupling the first piston to a plurality of second pistons. 15. The pressure sprayer of claim 14, wherein one of the plurality of second pistons is at least one of selectable or of a differing size from the other plurality of second pistons. 16. A pressure sprayer, comprising: a housing supported by at least one wheel; a tank for holding a fluid; an accumulator vessel for holding a pressurized fluid; a pump for pressurizing and advancing the fluid from the tank to the accumulator vessel in response to movement of the at least one wheel; a container configured to hold a chemical concentrate; a fluid motor in fluid communication with the accumulator vessel and the container, wherein the fluid motor is adapted to be driven by the pressurized fluid from the accumulator vessel and to pump the chemical concentrate from the container to a mixer adapted to mix the chemical concentrate with the pressurized fluid that drives the fluid motor to form a solution; and a nozzle adapted to spray the solution, wherein the fluid motor comprises a first piston that is mechanically linked to a second piston, and wherein the first piston is driven by the pressurized fluid from the accumulator vessel, the first piston concurrently drives the second piston, and the second piston, when so driven, pumps the chemical concentrate from the container. 17. The pressure sprayer of claim 16, wherein the fluid motor comprises a mixture controller adapted to entrain a variable amount of chemical concentrate. 18. The pressure sprayer of claim 16, wherein the container is replaceable. 19. The pressure sprayer of claim 16, wherein the mixer receives the pressurized fluid through a check valve that allows the pressurized fluid to flow from an outlet of the fluid motor to the mixer but prevents the chemical solution from flowing from the mixer to the outlet of the fluid motor.