Abstract:
A portable washing device comprising a sealable fluid chamber filled with liquid to a given level. An air pump increases the air pressure above the liquid and at a preselected value forces the liquid through a check valve, hose and spray head for washing. A safety relief valve in the chamber prevents the air pressure from exceeding a predetermined value.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to washing devices. 
     Washing devices of the type having a chamber for storing the washing liquid are known in the prior art but these do not utilize both the displacement or washing liquid by pressurized air as a method of forcing the liquid from the chamber under pressure and valves to control the water pressure. 
     Among those prior art devices that do not teach the use of air displacement for moving water are U.S. Pat. Nos. 2,033,812; 2,607,043; 2,850,742 and 3,192,537 which utilize rotary water pumps. 
     SUMMARY OF THE INVENTION 
     It is the principal object of this invention to provide a portable washing device that provides a stream of washing liquid discharging at a given pressure minimum. 
     It is a further object to provide means for establishing a maximum pressure for the discharging liquid. 
     These and other objects are achieved by the preferred embodiment of the invention in which an air-tight fluid chamber is provided that is fillable with washing liquid to a given level. An air pump increases the pressure of the air above the liquid surface. A check valve set to a predetermined pressure value will operate to allow the liquid to discharge a said predetermined pressure. A settable air pressure relief valve prevents the air pressure from exceeding the set pressure. 
     Having in mind the above and other objects that will be obvious from an understanding of the disclosure, the present invention comprises a combination and arrangement of parts illustrated in the presently preferred embodiments of the invention which are hereinafter set forth in sufficient detail to enable those skilled in the art to clearly understand the function, operation, construction and advantages of it when read in conjunction with the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     The invention will be described in detail, by way of example, with reference to the accompanying drawing in which: 
     FIG. 1 is a pictorial view of the washing device; 
     FIG. 2 is a partial front section view illustrating the principles of the invention; and 
     FIG. 3 is a partial section view taken across line 3--3 in FIG. 2. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to FIGS. 1-3 of the drawing and in accordance with the principles of the invention, a washing device 10 is shown comprising a sealable airtight fluid chamber 12 normally filled with air and capable of being filled with a washing liquid 14 such as water or a detergent solution, to a given level 16. Below that level 16 an exit port 18 is disposed through a wall of the chamber 12. Attached to the nipple 20 affixed to the exit port 18 is one end of a hose 22 that has a spray head 24 attached to its other end 25. The spray head 24 includes a plurality of nozzle apertures 26 at its discharge end. A check valve 28 is positioned between the other end 21 of the hose 22 but preferably in the exit port. The check valve 28 operates to permit the flow of water 14 out of the chamber 12 when the water pressure equals or is greater than the pressure determined by the valve ball 30 compressing the valve spring 32 to open a fluid passageway to the spray head 24. Adjusting means, not shown, may be utilized to set the minimum pressure of the discharged water. 
     Pressure is created in the device 10 by pumping air into the chamber 12 above the given level 14 by means of an air pump 34 driven by an electric motor 36. The pump 34 may be a piston, diaphragm or other commercially available types and must have sufficient capacity to provide pressure on the water surface that is at least equal to the operating pressure of the check valve 28. The pump 34 pressure outlet 38 is connected to an aperture 40 in the chamber 12 to put them in fluid communication. Air pumps 34 are advantageous in a washing device 10 such as the present invention because unlike water pumps, they are not susceptible to damage as from handling the various fluids one may encounter such as detergents, shampoos and other washing solutions as well as from solid impurities that may be present in the liquid. 
     Located in the upper portion of the chamber 12 are an adjustable pressure relief valve 42 and a filling aperture 44. A pressure cap 46 is connectible therewith and constructed to provide an air-tight seal around the aperture 44 when closed. The relief valve 42 is set to a predetermined pressure that is greater than check valve 28 pressure setting. In this way, the pump 34 may operate continuously to first build up the air pressure to the fluid release level and, if the pressure increases to the relief valve 42 setting, any additional air is discharged to the atmosphere. By use of these valves 28, 42 the air pressure and therefore the discharge pressure of the water 14 is confined between predetermined values independent of the liquid quantity of pump capacity or efficiency. 
     The chamber 12 and pump 34 and motor 36 are mounted on a base 47. A cover 49 is attached to the base 47 and encloses the pump 34 and motor 36. At least one aperture 48 is provided in the cover 49 to admit air to the intake 50 of the pump 34. The line cord 52 connects to the motor 36 and extends through the cover 49 through the apertures 48 or another opening 54 and terminates in a plug 56 for providing power to the motor 36. 
     In use, one fills the fluid chamber 12 to a given level 16 which may be defined by a visible reference in the chamber, a partition wall, not shown, defining separate air and water chambers that are in fluid communication. Location of the filling aperture 44 can automatically determine the maximum fill since no liquid can be filled above its height. The valves 28, 42 can be preset to the desired pressure range and the pump motor 36 energized to operate the pump 34 continuously. 
     While preferred and other exemplary embodiments of the invention are illustrated and/or described, it will be understood that the invention is in no way limited to these embodiments.