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A self-contained, hand-held spray dispensing device includes an internal source of pressurized fluid that exerts a motive force on a pair of liquid ejecting elements to cause each to eject a liquid into a discharge line. The liquids remain separated until each exits its discharge port. A pressurized

A self-contained, hand-held spray dispensing device includes an internal source of pressurized fluid that exerts a motive force on a pair of liquid ejecting elements to cause each to eject a liquid into a discharge line. The liquids remain separated until each exits its discharge port. A pressurized fluid is directed over the outlet ends of the discharge line beginning before a flow interrupter in the discharge line is opened to permit flow therethrough and ceasing after liquid flow is terminated. The pressurized fluid flow over the outlet of the discharge line aerosolizes liquids emanating from the outlet ends. Each liquid ejecting element takes the form of a piston disposed within a cylinder. The pistons responds to pressurized fluid imposed directly thereon from the source to generate the motive force on the ejecting element.

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1. A self-contained, hand-held spray dispensing device for dispensing one or more liquid material(s), the dispensing device comprising: a first and a second liquid container having a discharge port and a piston movably disposed therein, each piston having a working surface thereon, each piston being

1. A self-contained, hand-held spray dispensing device for dispensing one or more liquid material(s), the dispensing device comprising: a first and a second liquid container having a discharge port and a piston movably disposed therein, each piston having a working surface thereon, each piston being responsive to a motive force imposed on the working surface thereof to displace within its liquid container, thereby to cause a liquid material in that liquid container to be ejected from the discharge port,a housing;a first and a second liquid discharge line disposed within the housing, each of the first and second liquid discharge lines having an inlet end and an outlet end;a container support arrangement able to receive and to support the first and second liquid containers within the housing such that the discharge port of each of the first and second liquid containers is disposed in fluid communication with the respective inlet end of the first and second liquid discharge lines;a cartridge support arrangement disposed within the housing, the cartridge support arrangement being able to receive and to support a cartridge holding a pressurized motive fluid, the cartridge being a first source of the pressurized motive fluid;a first pressurized fluid line able to convey the pressurized motive fluid from the cartridge receivable within the housing into fluid communication with the working surface on the piston disposed in the respective first and second liquid containers receivable within the housing;a door capable of being positioned in an open position and a closed position, when in the closed position a swing axis of the door being offset by an offset distance from a central axis of the cartridge in the direction of the closed position of the door, wherein positioning the door in the closed position forces the cartridge into contact with a point on an interior of the door to prevent the door from being opened until the pressurized motive fluid has been expelled from the cartridge, wherein the point is located along the central axis of the cartridge;a valve able to control the flow of the pressurized motive fluid through the first pressurized fluid line; anda trigger operatively associated with the valve, the trigger being movable from a rest position to a first operational position,wherein when the trigger is in the first operational position, the trigger is operative to open the valve to permit the pressurized motive fluid from the cartridge receivable within the housing to flow through the first pressurized fluid line into each container receivable within the housing to generate the motive force on the working surface of the piston therein, thereby causing each piston to eject the liquid material in the container through the discharge port thereof. 2. The self-contained, hand-held spray dispensing device of claim 1, wherein at least one of the first and second container having the liquid material therein is removably received by the container support arrangement. 3. The self-contained, hand-held spray dispensing device of claim 1, wherein the first and second containers each having the liquid material therein are removably received by the container support arrangement. 4. The self-contained, hand-held spray dispensing device of claim 1, wherein the cartridge having the pressurized motive fluid therein is received by the cartridge support arrangement. 5. The self-contained, hand-held spray dispensing device of claim 1, further comprising: a flow interrupter for controlling the passage of the liquid material through each liquid discharge line;the trigger being operatively associated with the flow interrupter, the trigger being sequentially movable from the first operational position to a second operational position,wherein when the trigger is in the second operational position, the trigger being operative to open the flow interrupter to permit the passage of the liquid material through the first and second liquid discharge lines. 6. The self-contained, hand-held spray dispensing device of claim 1, further comprising: the cartridge support arrangement able to receive and to hold a second source containing a pressurized aerosoling fluid within the housing;a second pressurized fluid line able to convey the pressurized aerosoling fluid from the second source receivable within the housing over the outlet end of each of the first and second liquid discharge lines,the valve able to control the flow of the pressurized aerosoling fluid through the second pressurized fluid line; andthe trigger, wherein when the trigger is in the first operational position, being operative to control the valve to permit the pressurized aerosoling fluid to flow through the second pressurized fluid line, whereby a flow of the pressurized aerosoling fluid is able to pass over the outlet ends of the first and second liquid discharge lines to generate an aerosoling action on any liquid material emanating from the outlet ends of the first and second liquid discharge lines. 7. The self-contained, hand-held spray dispensing device of claim 6, wherein the cartridge receivable in the housing is able to provide both the pressurized motive fluid and the pressurized aerosoling fluid. 8. The self-contained, hand-held spray dispensing device of claim 6, wherein the second pressurized fluid line includes a first and a second sleeve, each sleeve being disposed in a surrounding relationship about the outlet end of the respective first and second liquid discharge lines. 9. The self-contained, hand-held spray dispensing device of claim 1, further comprising a regulator for supplying a regulated flow of pressurized fluid to the valve. 10. A self-contained, hand-held spray dispensing device for dispensing one or more liquid material(s), the dispensing device comprising: a first and a second liquid container having a discharge port and a piston movably disposed therein, each piston having a working surface thereon, each piston being responsive to a motive force imposed on the working surface thereof to displace within its container, thereby to cause a liquid material in that container to be ejected from the discharge port,a housing;a first and a second liquid discharge line disposed within the housing, each liquid discharge lines having an inlet end and an outlet end;a container support arrangement able to receive and to support the first and second liquid containers within the housing such that the discharge port of each of the first and second liquid containers is disposed in fluid communication with the respective inlet end of the first and second liquid discharge lines;a cartridge support arrangement disposed within the housing, the cartridge support arrangement being able to receive and to support a cartridge holding a pressurized motive fluid;a first pressurized fluid line and a second pressurized fluid line, the first and second pressurized fluid lines being able to convey the pressurized motive fluid from the cartridge receivable within the housing into fluid communication with the working surface on the piston disposed in each container receivable within the housing and over the outlet end of each of the first and second liquid discharge lines, respectively;a door capable of being positioned in an open position and a closed position, when in the closed position a swing axis of the door being offset by an offset distance from a central axis of the cartridge in the direction of the closed position of the door, wherein positioning the door in the closed position forces the cartridge into contact with a point on an interior of the door to prevent the door from being opened until the pressurized motive fluid has been expelled from the cartridge, wherein the point is located along the central axis of the cartridge;a valve able to control the flow of a pressurized fluid through the first and second pressurized fluid lines;a trigger operatively associated with the valve, the trigger being movable from a rest position to a first operational position,wherein when the trigger is in the first operational position the trigger being operative to open the valve to permit simultaneous pressurized fluid flow from the cartridge receivable within the housing:(i) through the first pressurized fluid line into each container receivable within the housing to generate the motive force on the working surface of the piston therein; and(ii) through the second pressurized fluid line over the outlet ends of the discharge lines,thereby to cause each piston in each container receivable in the housing to eject the liquid material in the container through the discharge port thereof and into the respective inlet end of the first and second liquid discharge lines;the first and second pressurized fluid lines being complementarily configured with respect to each other such that:the pressure of any fluid flowing through the first pressurized fluid line is able to act on the working surface of the piston in each container receivable in the housing to impose the motive force on each piston sufficient to cause the liquid material to emanate at a predetermined rate from the outlet end of each of the first and second liquid discharge lines, and, simultaneously,the velocity of any fluid flowing through the second pressurized fluid line being able to act to aerosolize any liquid material emanating from the outlet ends of the first and second liquid discharge lines. 11. The self-contained, hand-held spray dispensing device of claim 10, further comprising: a flow interrupter for controlling the passage of liquid material through each liquid discharge line;the trigger operatively associated with the flow interrupter, the trigger being sequentially movable from the first operational position to a second operational position,wherein when the trigger is in the second operational position the trigger being operative to open the flow interrupter to permit the passage of the liquid material through the first and second liquid discharge lines,whereby flow through the second pressurized fluid line starts before and finishes after the passage of any liquid material through each of the first and second liquid discharge lines. 12. The self-contained, hand-held spray dispensing device of claim 10, wherein the first and second liquid containers having the liquid material therein are removably received by the container support arrangement. 13. The self-contained, hand-held spray dispensing device of claim 10, wherein the cartridge having the pressurized fluid therein is received by the cartridge support arrangement. 14. The self-contained, hand-held spray dispensing device of claim 10, wherein the door includes an over-center cam mechanism associated therewith, the over-center cam mechanism being responsive to a force produced by the pressurized fluid in the cartridge for imposing a biasing force to maintain the door in the closed position. 15. The self-contained, hand-held spray dispensing device of claim 10, wherein the second pressurized fluid line includes a first and a second sleeve, each sleeve being disposed in a surrounding relationship about the outlet end of the respective first and second liquid discharge lines. 16. A kit for dispensing a spray of at least one liquid material, the kit comprising: a) a first and a second liquid container having a liquid material therein, each of the first and second liquid containers having a discharge port and a piston movably disposed therein, each piston having a working surface thereon, each piston being responsive to a motive force imposed on the working surface thereof to displace within its container, thereby to cause the liquid material in that container to be ejected from its discharge port; andb) a self-contained, hand-held spray dispensing device comprising:a housing;a first and a second liquid discharge line disposed within the housing, each of the first and second liquid discharge lines having an inlet end and an outlet end;a container support arrangement able to receive and to support the first and second liquid containers within the housing such that the discharge port of each of the first and second containers is disposed in fluid communication with the respective inlet end of the first and second liquid discharge lines;a cartridge support arrangement disposed within the housing, the cartridge support arrangement being able to receive and to support a cartridge holding a pressurized motive fluid;a first pressurized fluid line able to convey the pressurized motive fluid from the cartridge receivable within the housing into fluid communication with the working surface on each piston disposed in each container receivable within the housing;a door capable of being positioned in an open position and a closed position, when in the closed position a swing axis of the door being offset by an offset distance from a central axis of the cartridge in the direction of the closed position of the door, wherein positioning the door in the closed position forces the cartridge into contact with a point on an interior of the door to prevent the door from being opened until the pressurized motive fluid has been expelled from the cartridge, wherein the point is located along the central axis of the cartridge;a valve able to control the flow of the pressurized motive fluid through the first pressurized fluid line; anda trigger operatively associated with the valve, the trigger being movable from a rest position to a first operational position,wherein when the trigger is in the first operational position the trigger being operative to open the valve to permit the pressurized motive fluid from the cartridge receivable within the housing to flow through the first pressurized fluid line into each of the first and second liquid containers receivable within the housing to generate the motive force on the working surface of the piston therein,thereby to cause each piston to eject the liquid material in each of the first and second liquid containers through the discharge port thereof. 17. The spray dispensing kit of claim 16, further comprising the cartridge having a pressurized fluid therein, the cartridge being sized for receipt in the cartridge support arrangement within the housing. 18. A kit for dispensing a spray of at least one liquid material, the kit comprising: a) a first and a second liquid container each having a liquid material therein, each of the first and second liquid containers having a discharge port and a piston movably disposed therein, each piston having a working surface thereon, each piston being responsive to a motive force imposed on the working surface thereof to displace within its container, thereby to cause the liquid material in that container to be ejected from the discharge port; andb) a self-contained, hand-held spray dispensing device comprising:a housing;a first and a second liquid discharge line disposed within the housing, each of the first and second liquid discharge lines having an inlet end and an outlet end;a container support arrangement able to receive and to support the first and second liquid containers within the housing such that the discharge port of each of the first and second liquid containers is disposed in fluid communication with the respective inlet end of the first and second liquid discharge lines;a cartridge support arrangement disposed within the housing, the cartridge support arrangement being able to receive and to support a cartridge holding a pressurized motive fluid;a first pressurized fluid line and a second pressurized fluid line, the pressurized fluid lines being able to convey the pressurized motive fluid from the cartridge receivable within the housing into fluid communication with the working surface on the piston disposed in each of the first and second liquid containers receivable within the housing and over the outlet end of each of the first and second liquid discharge lines, respectively;a door capable of being positioned in an open position and a closed position, when in the closed position a swing axis of the door being offset by an offset distance from a central axis of the cartridge in the direction of the closed position of the door, wherein positioning the door in the closed position forces the cartridge into contact with a point on an interior of the door to prevent the door from being opened until the pressurized motive fluid has been expelled from the cartridge, wherein the point is located along the central axis of the cartridge;a valve able to control the flow of the pressurized motive fluid through the first and second pressurized fluid lines;a trigger operatively associated with the valve, the trigger being movable from a rest position to a first operational position,wherein when the trigger is in the first operational position the trigger being operative to open the valve to permit simultaneous pressurized fluid flow from the cartridge receivable within the housing:(i) through the first pressurized fluid line into each of the first and second liquid containers receivable within the housing to generate the motive force on the working surface of the piston therein; and(ii) through the second pressurized fluid line over the outlet ends of the discharge lines,thereby to cause the piston in each of the first and second liquid containers receivable in the housing to eject the liquid material in the liquid container through the discharge port thereof and into the inlet end of each of the first and second liquid discharge lines;the first and second pressurized fluid lines being complementarily configured with respect to each other such that:the pressure of any fluid flowing through the first pressurized fluid line is able to act on the working surface of the piston in each container receivable in the housing to impose the motive force on the piston sufficient to cause the liquid material to emanate at a predetermined rate from the outlet end of each of the first and second liquid discharge lines, and, simultaneously,the velocity of any fluid flowing through the second pressurized fluid line being able to act to aerosolize any liquid material emanating from the outlet ends of the first and second liquid discharge lines. 19. The spray dispensing kit of claim 18, further comprising the cartridge having a pressurized fluid therein, the cartridge being sized for receipt in the cartridge support arrangement within the housing. 20. A kit for dispensing a spray of at least one liquid material, the kit comprising: a) a self-contained, hand-held spray dispensing device comprising:a housing;a first and a second liquid discharge line disposed within the housing, each of the first and second liquid discharge lines having an inlet end and an outlet end;a first and a second liquid container, each of the first and second liquid containers having a discharge port and a piston movably disposed therein, each piston having a working surface thereon;a container support arrangement able to receive and to support the first and second liquid containers within the housing such that the discharge port of each of the first and second liquid containers is disposed in fluid communication with the respective inlet end of the first and second liquid discharge lines;a cartridge support arrangement disposed within the housing, the cartridge support arrangement being able to receive and to support a cartridge holding a pressurized motive fluid;a first pressurized fluid line able to convey the pressurized motive fluid from the cartridge receivable within the housing into fluid communication with the working surface on the piston disposed in each of the first and second liquid containers receivable within the housing;a door capable of being positioned in an open position and a closed position, when in the closed position a swing axis of the door being offset by an offset distance from a central axis of the cartridge in the direction of the closed position of the door, wherein positioning the door in the closed position forces the cartridge into contact with a point on an interior of the door to prevent the door from being opened until the pressurized motive fluid has been expelled from the cartridge, wherein the point is located along the central axis of the cartridge;a valve able to control the flow of a pressurized motive fluid through the first pressurized fluid line; anda trigger operatively associated with the valve, the trigger being movable from a rest position to a first operational position,wherein when the trigger is in the first operational position the trigger being operative to open the valve to permit the pressurized motive fluid from the cartridge receivable within the housing to flow through the first pressurized fluid line into each of the first and second liquid containers receivable within the housing to generate a motive force on the working surface of the piston therein,thereby to cause the piston to eject the liquid material in each of the first and second liquid containers through the discharge port thereof; andb) the cartridge having a pressurized fluid therein, the cartridge being sized for receipt in the cartridge support arrangement disposed within the housing. 21. The spray dispensing kit of claim 20, wherein the first and second liquid containers each include a liquid material therein. 22. A self-contained, hand-held spray dispensing device for dispensing one or more liquid material(s), the dispensing device comprising: a housing;at least a first container disposed within the housing, the container having a liquid material to be dispensed therein, the container having a discharge port;a piston movably disposed within the container, the piston having a working surface thereon, the piston being responsive to a motive force imposed thereon to displace within its container thereby to cause the liquid material in that container to be ejected from its discharge port;a reservoir mounted within the housing, the reservoir holding a pressurized fluid at a predetermined pressure, the reservoir being a first source of the pressurized fluid;a door capable of being positioned in an open position and a closed position, when in the closed position a swing axis of the door being offset by an offset distance from a central axis of the reservoir in the direction of the closed position of the door, wherein positioning the door in the closed position forces the reservoir into contact with a point on an interior of the door to prevent the door from being opened until the pressurized fluid has been expelled from the reservoir, wherein the point is located along the central axis of the reservoir;a first pressurized fluid line connecting the reservoir into fluid communication with the working surface on the piston;a first valve for controlling the flow of the pressurized fluid through the first pressurized fluid line; anda trigger operatively associated with the first valve, the trigger being movable from a rest position to a first operational position,wherein when the trigger is in the first operational position the trigger being operative to open the first valve to permit pressurized fluid from the reservoir to flow through the pressurized fluid line into contact with the working surface of the piston, thereby to impose the motive force on the piston. 23. The self-contained, hand-held spray dispensing device of claim 22, further comprising: a second container disposed within the housing, the second container having a liquid material to be dispensed therein, the second container having a discharge port;a second piston movably disposed within the second container, the second piston having a working surface thereon, the second piston being responsive to a motive force imposed thereon to displace within its container thereby to cause the liquid material in that container to be ejected from its discharge port. 24. The self-contained, hand-held spray dispensing device of claim 22, further comprising: a flow interrupter for controlling the passage of liquid material through a discharge line;the trigger being operatively associated with the flow interrupter, the trigger being sequentially movable from the first operational position to a second operational position,wherein when the trigger is in the second operational position the trigger being operative to open the flow interrupter to permit the passage of the liquid material through the discharge line. 25. The self-contained, hand-held spray dispensing device of claim 22, further comprising: a liquid discharge line connected in fluid communication with the discharge port of each container, each liquid discharge line having an outlet end,a second source of pressurized aerosoling fluid;a second pressurized fluid line connecting the second source of the pressurized aerosoling fluid into fluid communication with the outlet end of each liquid discharge line, wherein the second pressurized fluid line accommodates flow of the pressurized aerosoling fluid flows therethrough; andthe trigger,wherein when the trigger is in the first operational position, being operative to permit the pressurized aerosoling fluid to flow through the second pressurized fluid line,whereby a flow of the pressurized fluid over the outlets of the liquid discharge lines generates an aerosoling action on any liquid material emanating from the outlet ends of the liquid discharge lines. 26. The self-contained, hand-held spray dispensing device of claim 25, wherein the second source of the pressurized aerosoling fluid is a second reservoir. 27. The self-contained, hand-held spray dispensing device of claim 25, wherein the first valve acts to control fluid flow through both the first and second pressurized fluid lines. 28. The self-contained, hand-held spray dispensing device of claim 25, wherein the second pressurized fluid line includes a sleeve, the sleeve being disposed in a surrounding relationship about the outlet end of the liquid discharge line. 29. A self-contained, hand-held spray dispensing device for dispensing one or more liquid material(s), the dispensing device comprising: a housing;a first and a second container disposed within the housing, at least one of the first and second containers having a liquid material to be dispensed therein, each of the first and second containers having a discharge port;a liquid discharge line connected in fluid communication with the discharge port of each container, each liquid discharge line having an outlet end;a piston movably disposed within each of the first and second containers, each piston having a working surface thereon, each piston being responsive to a motive force imposed thereon to displace within its container to cause the liquid material in that container to be ejected into its associated discharge line;a reservoir mounted within the housing, the reservoir holding a fluid at a predetermined pressure;a first pressurized fluid line connecting the reservoir into fluid communication with the working surfaces on the pistons;a second pressurized fluid line connecting the reservoir into fluid communication with the outlet end of each liquid discharge line,a door capable of being positioned in an open position and a closed position, when in the closed position a swing axis of the door being offset by an offset distance from a central axis of the reservoir in the direction of the closed position of the door, wherein positioning the door in the closed position forces the reservoir into contact with a point on an interior of the door to prevent the door from being opened until the fluid has been expelled from the reservoir, wherein the point is located along the central axis of the reservoir;a valve for controlling the flow of pressurized fluid through the first and second pressurized fluid lines; anda trigger operatively associated with the valve, the trigger being movable from a rest position to a first position,wherein when the trigger is in the first position the trigger being operative to open the valve to permit simultaneous pressurized fluid flow from the reservoir:(i) through the first pressurized fluid line into contact against the working surface of each piston; and(ii) through the second pressurized fluid line over the outlet ends of the discharge lines;the first and second pressurized fluid lines being complementarily configured with respect to each other such that:the pressure of any fluid flowing through the first pressurized fluid line acts on the working surfaces of the pistons to impose the motive force on the pistons sufficient to cause the liquid material to emanate at a predetermined rate from the outlet end of each discharge line, and, simultaneously,the velocity of any fluid flowing through the second pressurized fluid line acts to aerosolize materials emanating from the outlet ends of the discharge lines. 30. The self-contained, hand-held spray dispensing device of claim 29, further comprising: a flow interrupter for controlling the passage of the liquid material through the discharge lines;the trigger operatively associated with the flow interrupter, the trigger being sequentially movable from the first position to a second position,wherein when the trigger is in the second position the trigger being operative to open the flow interrupter to permit the passage of the liquid material through the discharge lines,whereby flow through the second pressurized fluid line starts before and finishes after the passage of the liquid material through the discharge lines. 31. The self-contained, hand-held spray dispensing device of claim 30, wherein the first and second containers have the liquid material disposed therein. 32. The self-contained, hand-held spray dispensing device of claim 29, wherein the second pressurized fluid line includes a first and a second sleeve, each sleeve being disposed in a surrounding relationship about the outlet end of the liquid discharge line. 33. A self-contained, hand-held spray dispensing device for dispensing one or more liquid material(s), the dispensing device comprising: a first and a second container having a discharge port and a piston movably disposed therein, wherein each piston is configured to receive a motive force thereon, each piston being responsive to the motive force thereon, thereby causing a liquid material in that container to be ejected from the discharge port,a housing;a first and a second liquid discharge line disposed within the housing, each of the first and second liquid discharge lines having an inlet end and an outlet end;a container support arrangement able to receive and to support the first and second liquid containers within the housing such that the discharge port of each of the first and second containers is disposed in fluid communication with the respective inlet end of the first and second liquid discharge lines;a cartridge support arrangement disposed within the housing, the cartridge support arrangement being able to receive and to support a cartridge holding a pressurized fluid;a pressurized fluid line able to convey the pressurized fluid from the cartridge receivable within the housing to flow over the outlet end of each of the first and second liquid discharge lines;a door capable of being positioned in an open position and a closed position, when in the closed position a swing axis of the door being offset by an offset distance from a central axis of the cartridge in the direction of the closed position of the door, wherein positioning the door in the closed position forces the cartridge into contact with a point on an interior of the door to prevent the door from being opened until the pressurized fluid has been expelled from the cartridge, wherein the point is located along the central axis of the cartridge;a valve able to control the flow of the pressurized fluid through the pressurized fluid line; anda trigger operatively associated with the valve, the trigger being movable from a rest position to a first operational position,wherein when the trigger is in the first operational position the trigger being operative to open the valve to permit the pressurized fluid from the cartridge receivable within the housing to flow through the pressurized fluid line over the outlet ends of the first and second liquid discharge lines.