Patent ID: 7757900

Claim:
Dispenser pump ( 1 , 1 ′, 1 ″, 1 ′″) for the drip-free dispensing of metered amounts of liquid to paste-like products from containers such as bottles ( 26 ), canisters, or tubes, consisting of a lower pump part ( 6 , 6 ′, 6 ″), which is equipped with a suction opening ( 4 ) and is designed to be fastened in the opening of a container ( 5 ), where the suction opening ( 4 ) is brought into contact with the product by means of a tube ( 21 ); and an upper pump part ( 8 , 8 ′, 8 ″) designed to draw the product through the suction opening ( 4 ) of the lower pump part ( 6 ) into a suction chamber ( 14 , 14 ′, 14 ″) that has a changeable volume via a movable hood ( 10 ) or in the manner of a piston pump and to discharge the product from this suction chamber ( 14 , 14 ′, 14 ″) through a discharge channel ( 3 ) with an applicator opening ( 24 ), wherein a one-piece, elastic valve disk ( 7 ), formed without through-openings , lies flat and unfastened on the suction opening ( 4 ) of the upper pump part ( 6 , 6 ′, 6 ″) and thus forms the bottom end of the suction chamber ( 14 , 14 ′, 14 ″) and provides a double function of an inlet valve and an outlet valve for the suction chamber; the bottom opening ( 2 ) of lower discharge channel part ( 3 ′) extends all the way down to the center of the valve disk ( 7 ); and wherein the center part of the valve disk ( 7 ) bulges up and down due to pressure changes in the suction chamber due to volume changes of the pressure chamber so that the disk alternately opens and closes the centrally located bottom opening ( 2 ) of the discharge channel part ( 3 ), whereas conversely the outer edge area ( 25 ) of the disk undergoes deformation simultaneously to close and open the suction opening ( 4 ) of the lower pump part ( 6 , 6 ′, 6 ″).