Patent ID: 6929156

Claim:
A manually-actuated fluid dispenser pump including a pump body ( 10 ) and a piston ( 50 ) mounted to slide in leaktight manner in said pump body ( 10 ) between a rest position and a dispensing position, said piston being provided with at least a top sealing lip ( 52 ) in leaktight contact with said pump body ( 10 ), said pump including an abutment member ( 80 ) fitted into the top edge of the pump body ( 10 ) and co-operating with said piston ( 50 ) to define rest position of the piston, said fluid dispenser pump being characterized in that the top lip ( 52 ) of the piston ( 50 ) is made up of a first lip portion ( 53 ) co-operating in leaktight manner with the pump body ( 10 ) and of a second lip portion ( 54 ) co-operating in leaktight manner with said abutment member ( 80 ) in the rest position, said first and second lip portions ( 53 , 54 ) being substantially parallel and spaced apart radially from each other.