Manually operated spray pump

A finter actuated spray pump mechanism having neutral and compressed positions comprising a pump cycle, for dispensing a fluid product comprising in combination:

• a substantially cylindrical accumulator top constructed and arranged to be fitted in removable relation to the top of a container of a reservoir of said fluid product;
• said accumulator top substantially closed at its upper end except for an axially disposed valve including a valve head and a valve opening in a housing integrally formed at the center of said accumulator, and means comprising an air vent constructed to admit air to said container when the interior is below ambient pressure;
• said valve opening communicating with said reservoir of fluid product;
• said accumulator top including a pair of upwardly directed coaxial sleeves forming an outer annular chamber and an inner annular chamber coaxially surrounding said valve;
• a nozzle housing comprising a hollow cylinder having a closed upper end including a spray nozzle, the open lower end of said nozzle housing being accommodated for telescopic movement in said outer annular chamber, corresponding to the neutral and compressed positions of said pump cycle, and forming with means including a portion of said inner annular chamber a variable volume air chamber constructed to expand and contract with said telescopic motion for providing compressed air;
• a receptacle including a downwardly directed preloaded spring-biased sealing element depending in axial relation from the upper end of said nozzle housing,
• a hollow piston having a grooved fitting at its upper end, said receptacle constructed to mate with said grooved fitting so that said hollow piston is disposed in fixed coaxial relation with said receptacle and said outer and inner annular chambers for reciprocating motion in conformity with the telescopic motion of said nozzle housing in said outer annular chamber;
• means comprising a spring constructed to urge said nozzle housing and said hollow piston to the neutral position of said pump cycle;
• the lower end of said hollow piston constructed to at least partially close said valve in the compressed position of said pump cycle, and to release said valve to open when said hollow piston is in the neutral position of said pump cycle, said hollow piston disposed to serve as a channel for fluid product passing through said valve;
• said grooved fitting forming with said receptacle a mixing chamber and intake means;
• a first said intake means for compressed air connected between said variable volume air chamber and said mixing chamber;
• a second said intake means including said preloaded spring-biased sealing element for product fluid connected between said hollow piston and said mixing chamber;
• said grooved fitting constructed during at least part of said pump cycle to maintain said second intake means in closed position, and during another part of said pump cycle in response to internal product fluid pressure in said hollow stem piston to open said second intake means in response to overriding pressure on said preloaded spring-biased sealing element to admit fluid product to said mixing chamber, and to simultaneously admit compressed air into said mixing chamber through said first intake means, whereby said compressed air atomizes said fluid product and expels atomized spray through said spray nozzle.

A pressure actuated dispenser constructed to dispense fluid product in a compressed gas carrier from a container comprising a reservoir of said fluid product, said dispenser comprising in combination:

• a dual cylinder pump including an annular variable volume chamber and a central pump for the fluid product disposed axially in said chamber, said central pump including a pump chamber and a hollow stem piston;
• a centrally disposed control valve for communicating between said pump chamber and said reservoir;
• said variable volume chamber being defined by fixed and movable elements which allow the variable volume chamber to contract and expand for the compression and intake of carrier gas upon compression and release from compression of said dispenser, and said hollow stem piston being coupled for movement in synchronism with the movement of the movable elements of said variable volume chamber, to cause the closing and opening of said control valve to said fluid product reservoir;
• said dual cylinder pump including a centrally disposed mixing chamber having a first normally closed intake means for admitting compressed carrier gas from said variable volume chamber, and a second normally closed intake means for admitting fluid product from said hollow stem piston, each constructed to open in response to a preselected pressure for mixing said fluid product with said compressed gas carrier to form an atomized spray;
• and means comprising a spray nozzle connected to said mixing chamber for exhausting said spray from said mixing chamber in a high pressure stream.