Airless liquid spray gun having a diaphragm pump and filtering apparatus

Claim 2

A GUN FOR SPRAYING LIQUID UNDER PRESSURE INCLUDING IN COMBINATION MEANS FORMING A PRESSURE CHAMBER IN THE GUN, MEANS CONNECTING SAID CHAMBER WITH A SOURCE OF SPRAY LIQUID UNDER PRESSURE, A SPRAY NOZZLE CONNECTED TO SAID GUN AND HAVING A PASSAGE COMMUNICATING WITH THE CHAMBER SHAPED TO ATOMIZE PRESSURIZED LIQUID PASSING THERETHROUGH INTO A SPRAY, AN OUTLET VALVE ADAPTED TO CLOSE SAID NOZZLE PASSAGE, MEANS FOR BIASING SAID OUTLET VALVE TO CLOSED POSITION, MEANS FOR RETURNING THE PRESSURE FLUID FROM SAID CHAMBER BACK TO SAID SOURCE, A NORMALLY OPEN TRIGGER VALVE ACTUATABLE TO CLOSE SAID RETURN MEANS TO BUILD UP PRESSURE IN SAID CHAMBER, SAID OUTLET VALVE INCLUDING MEANS HAVING A WORKING SURFACE EXPOSED TO THE PRESSURE FLUID IN SAID CHAMBERSUCH THAT THE FLUID ACTING ON SAID WORKING SURFACE DEVELOPS AN OPENING FORCE ON SAID VALVE IN RESPONSE TO SAID PRESSURE BUILDUP OPERABLE TO OPEN SAID OUTLET VALVE AT A PREDETERMINED PRESSURE.

Claim 3

APPARATUS FOR SPRAYING LIQUIDS UNDER HIGH PRESSURE COMPRISING A CABINET, AN ELECTRIC MOTOR MOUNTED IN SAID CABINET AND HAVING A ROTARY OUTPUT SHAFT EXTENDING FROM ONE END THEREOF IN SAID CABINET, A CASING ADJACENT ONE END OF THE MOTOR, SAID MOTOR SHAFT EXTENDING INTO SAID CASING, A CYLINDER CONNECTED TO SAID CASING AND HAVING A PISTON RECIPROCABLE THEREIN WITH ONE END OF SAID PISTON EXTENDING INTO SAID CASING, MEANS OPERABLY CONNECTING SAID MOTOR SHAFT TO SAID PISTON TO CONVERT ROTARY MOTION OF THE SHAFT TO RECIPROCATING MOTION OF THE PISTON, SAID CYLINDER HAVING A WORKING CHAMBER, SAID PISTON HAVING AN END REMOTE FROM SAID CASING DEFINING A MOVABLE WALL IN SAID WORKING CHAMBER, PRESSURE FLUID CONDUCTOR MEANS CONNECTED TO SAID WORKING CHAMBER AND INCLUDING A RIGID TUBULAR CONDUCTOR EXTENDING FROM SAID CABINET, MEANS SUPPORTING ONE END OF SAID CONDUCTOR IN SAID CABINET, A PUMP SUPPORTED ON THE OTHER END OF SAID CONDUCTOR EXTERIORLY OF THE CABINET, AND ADAPTED FOR SUBMERGENCE IN A CONTAINER CONTAINING THE LIQUID TO BE SPRAYED, SAID PUMP HAVING A FLUID CHAMBER COMMUNICATING WITH SAID WORKING CHAMBER OF THE CYLINDER VIA SAID CONDUCTOR, AND A DIAPHRAGM DISPOSED IN SAID PUMP CHAMBER, SAID PUMP INCLUDING FLOW PASSAGE MEANS HAVING AN INLET AND AN OUTLET AND VALVES ASSOCIATED THEREWITH COOPERABLE WITH SAID DIAPHRAGM IN RESPONSE TO EXPANSION AND CONTRACTION OF SAID DIAPHRAGM PRODUCED BY FLUID PRESSURE PULSATIONS IN SAID PUMP CHAMBER TO PUMP LIQUID FROM THE CONTAINER TO SAID OUTLET, SAID PULSATIONS CAUSING SAID PUMP AND SAID RIGID TUBULAR CONDUCTOR TO VIBRATE TO THEREBY EFFECT A STIRRING ACTION ON THE LIQUID IN THE CONTAINER.

Claim 4

APPARATUS FOR SPRAYING LIQUIDS UNDER HIGH PRESSURE COMPRISING A CABINET, AN ELECTRIC MOTOR MOUNTED IN SAID CABINET AND HAVING A ROTARY OUTPUT SHAFT EXTENDING FROM ONE END THEREOF IN SAID CABINET, A CASING ADJACENT ONE END OF THE MOTOR, SAID MOTOR SHAFT EXTENDING INTO SAID CASING, A CYLINDER CONNECTED TO SAID CASING AND HAVING A PISTON RECIPROCABLE THEREIN WITH ONE END OF SAID PISTON EXTENDING INTO SAID CASING, MEANS OPERABLY CONNECTING SAID MOTOR SHAFT TO SAID PISTON TO CONVERT ROTARY MOTION OF THE SHAFT TO RECIPROCATING MOTION OF THE PISTON, SAID CYLINDER HAVING A WORKING CHAMBER, SAID PISTON HAVING AN END REMOTE FROM SAID CASING DEFINING A MOVABLE WALL IN SAID WORKING CHAMBER, PRESSURE FLUID CONDUCTOR MEANS CONNECTED TO SAID WORKING CHAMBER AND INCLUDING A RIGID TUBULAR CONDUCTOR EXTENDING FROM SAID CABINET, MEANS SUPPORTING ONE END OF SAID CONDUCTOR IN SAID CABINET, A PUMP SUPPORTED ON THE OTHER END OF SAID CONDUCTOR EXTERIORLY OF THE CABINET, AND ADAPTED FOR SUBMERGENCE IN A CONTAINER CONTAINING THE LIQUID TO BE SPRAYED, SAID PUMP HAVING A FLUID CHAMBER COMMUNICATING WITH SAID WORKING CHAMBER OF THE CYLINDER VIA SAID CONDUCTOR, AND A DIAPHRAGM DISPOSED IN SAID PUMP CHAMBER, SAID PUMP INCLUDING FLOW PASSAGE MEANS HAVING AN INLET AND AN OUTLET AND VALVES ASSOCIATED THEREWITH COOPERABLE WITH SAID DIAPHRAGM IN RESPONSE TO EXPANSION AND CONTRACTION OF SAID DIAPHRAGM PRODUCED BY FLUID PRESSURE PULSATIONS IN SAID PUMP CHAMBER TO PUMP LIQUID FROM THE CONTAINER TO SAID OUTLET, SAID PULSATIONS CAUSING SAID PUMP AND SAID RIGID TUBULAR CONDUCTOR TO VIBRATE TO THEREBY EFFECT A STIRRING ACTION ON THE LIQUID IN THE CONTAINER.

Claim 5

IN AN APPARATUS FOR HIGH PRESSURE AIRLESS SPRAYING OF LIQUID INCLUDING A PUMP HAVING AN INLET ADAPTED TO BE CONNECTED TO A SOURCE OF THE SPRAY LIQUID AND HAVING AN OUTLET FOR DISCHARGING THE LIQUID FROM SAID PUMP, THE COMBINATION THEREWITH OF A SELF-WASHING FILTER COMPRISING A CASING HAVING A LIQUID CHAMBER THEREIN, A FILTER EXTENDING

Claim 6

IN AN APPARATUS FOR HIGH PRESSURE AIRLESS SPRAYING OF LIQUID INCLUDING A PUMP HAVING AN INLET ADAPTED TO BE CONNECTED TO A SOURCE OF THE SPRAY LIQUID AND HAVING AN OUTLET FOR DISCHARGING THE LIQUID FROM SAID PUMP, THE COMBINATION THEREWITH OF A SELF-WASHING FILTER COMPRISING A CASING HAVING A LIQUID CHAMBER THEREIN, A FILTER EXTENDING