Patent ID: 7775404

Claim:
Pump for dispensing fluid products comprising a pump body ( 10 ), a pump chamber ( 20 ), at least one piston ( 30 ) sliding in said pump chamber ( 20 ) to dispense the fluid product, a dispensing orifice ( 45 ), and a shutter ( 38 ) interacting with said dispensing orifice ( 45 ), said shutter ( 38 ) being movable and/or deformable between a closed position of the dispensing orifice ( 45 ) and an open position of the dispensing orifice ( 45 ), said shutter ( 38 ) being elastically driven to its closed position, wherein the pump comprises only one elastic element ( 50 ) adapted for bringing said at least one piston ( 30 ) back to its rest position after actuation and for driving said shutter ( 38 ) to its closed position, and in that said at least one piston ( 30 ) is embodied in one piece with said shutter ( 38 ), wherein said pump is constituted by only four parts including a part forming a dispensing head ( 40 ), a part forming the piston ( 30 ) and the shutter ( 38 ), a part forming the elastic element ( 50 ), and a part forming the pump body ( 10 ), a retaining ring ( 15 ) and a plunger tube ( 18 ), wherein each of the four parts is a one-piece integral construction, the part forming the pump body ( 10 ), the retaining ring ( 15 ) and the plunger tube ( 18 ) also forming a seat ( 71 ) of an inlet valve ( 70 ) of the pump chamber ( 20 ) which interacts with a valve element ( 75 ), wherein the valve element ( 75 ) is integral with the part forming the piston ( 30 ) and the shutter ( 38 ), and the inlet valve ( 70 ) is open when the pump is in the rest position.