Patent ID: 6866168

Claim:
A manually-actuated fluid dispenser pump including a pump body ( 10 ) containing a pump chamber ( 20 ), said pump chamber ( 20 ) being defined between an inlet valve ( 30 ) and an outlet valve ( 40 ), a piston ( 50 ) being mounted to slide in said pump body ( 10 ) between a rest position and a dispensing position for dispensing the fluid contained in the pump chamber, said piston ( 50 ) being connected to, and in particular integral with, an actuating rod ( 60 ) provided with an expulsion channel ( 65 ), said inlet valve ( 30 ) including an inlet valve element ( 31 ) mounted to move in the pump body ( 10 ) and co-operating with said pump body ( 10 ) or with an element secured to or integral with said pump body to define the open and the closed positions for said inlet valve ( 30 ), said outlet valve ( 40 ) including an outlet valve element ( 41 ) mounted to move in the pump body ( 10 ) and co-operating with said actuating rod ( 60 ) or with an element secured to or integral with said actuating rod to define the open and the closed positions for said outlet valve ( 40 ), wherein, during actuation, said outlet valve ( 40 ) is urged into its closed position by the pressure from the fluid contained in the pump body ( 20 ), said outlet valve element ( 41 ) being moved into the open position of the outlet valve ( 40 ) by said inlet valve element ( 31 ) when the piston ( 50 ) reaches its dispensing position; and wherein said inlet valve element ( 31 ) includes a bottom hollow axial sleeve ( 32 ) which, when said inlet valve is in the closed position ( 30 ), slides in leaktight manner around a hollow axial tube ( 12 ) secured to or integral with the pump body ( 10 ), a bottom end ( 33 ) of said bottom sleeve ( 32 ) being spaced apart from a ton end ( 13 ) of said axial tube ( 12 ) when said inlet valve ( 30 ) is in the open position to define a passageway through which fluid can flow into the pump chamber ( 20 ).