DE10006157B4 - Pump dispenser with a hand pump and a plastic piston for removing portions of a liquid product from a container - Google Patents

Abstract

pump dispenser (2.2) with a hand pump (11) and a piston (1) made of plastic for removing portions of a liquid product (3) from a hollow cylindrical container (4) about a removal opening (5) of the cap (6) having a container (4), wherein the piston (1) for sealing with the container (4) has a peripheral flat ring (7) and into the container (4) is axially displaceable and a bottom (8) for the container (4) forms, characterized in that the bottom (8) so bistable domed is formed so that the fully filled container (4) of the bottom (8) after outside convex arched and at the empty container (4) is concavely curved by means of a suction vacuum of the hand pump (11) and thereby bears against the inside of the cap (6) in a complementary manner, that the bottom (8) with the flat ring (7) by means of an annular film hinge (9), wherein the film hinge (9) in the upper area of the flat ring (7) is arranged, and that the bottom (8) at least ...

Description

The The invention relates to a pump dispenser according to the preamble of the preamble of claim 1.

such Devices using a piston are in the most diverse versions known and have the disadvantage that by the inwardly curved piston, which forms a bottom of the hollow cylindrical container, the container in fully filled Condition has a significant amount of space and thus a larger filling with simulating a product. The inside vault the piston causes in the end position of the piston residual amount minimization, there the arched Inside of the cap complementary to the bottom arch is configured and thus no product residual amount can arise. An operation the piston is either by a negative pressure of a hand pump, wherein the piston by the resulting negative pressure of the liquid product during pumping is retightened, or by external manual operation at a Crucible execution.

One the genus of forming pump dispenser with a hand pump and a Plastic pistons for removing portions of a liquid product from a hollow cylinder-like container via a removal opening of the a capped container, wherein the piston for sealing with the container has a peripheral flat ring and in the container is axially displaceable and forms a bottom for the container, is known from DE-35 07 134-C2. Because this is the bottom of the piston convex towards the interior is, arises in the container one Reduction of a filling volume for the liquid Product.

Out WO-99/47433-A1 is a cartridge with an externally operable Piston known, wherein a bottom of the piston formed so bistable arched is that when fully filled Cartridge the floor to the outside arched convexly and with almost empty cartridge by means of another external pressure on the piston, the floor is concave arched while on a Cap complementary on the inside is applied. This results in an optimal filling volume of the cartridge for the liquid product achieved while minimizing residual amounts.

Out DE-84 25 155-U1 is a cartridge with an externally operable Piston known, wherein a bottom of the piston to the interior convex domed is in the cartridge, a reduction of a filling volume for the liquid product. The elastically formed bottom of the piston is used during the filling process with a hot product, a pressure equalization during the cooling process create.

Of the Invention is the object of a generic pump dispenser to create the optimum filling volume and a residual amount minimization for the liquid Product has.

Is solved This object according to the characterizing part of claim 1. Thus also results in a more compact volume of the container at a comparable capacity.

The Invention is based on an embodiment described in more detail.

It shows:

1 in a sectional view of an embodiment;

2 in a detailed sectional view of the lower part of the 1 , and

3 and 4 further positions of a piston after the 1 ,

1 shows as an embodiment a piston 1 made of plastic for a pump dispenser 2.2 for removing portions of a liquid product 3 from a hollow cylinder-like container 4 via a removal opening 5 of a cap 6 having container 4 , The piston 1 points for sealing with the container 4 a peripheral flat ring 7 and is in the container 4 used axially displaceable and forms a bottom 8th for the container. The floor 8th is designed such a bistable arched, that when fully filled container 4 with the product 3 ( 1 ) the floor 8th outwardly convex (optimal filling volume) and in the empty container 4 ( 4 ) is concave and on the cap 6 inside complementary (residue minimization). The floor 8th is with the flat ring 7 by means of an annular film hinge 9 connected, reducing the ground 8th can move from a first stable position to a second stable position (bistability). The movie hinge 9 is in the upper area of the flat ring 7 arranged, creating a large bulge of the soil 8th reached in a second stable position, to complement the inside of the cap 6 to rest. For cost reasons, the cap 6 and the container 4 one-piece made of plastic. The floor 8th has at least one concentric deformation groove 10 on, causing a deformation of the soil 8th is facilitated in another stable position. The pump dispenser 2.2 is with a liquid product 3 sucking hand pump 11 Mistake.

The 2 shows for clarity a detail view of the lower area after the 1 , where the indicated by dashed lines soil 8th the second stable position with an empty container 4 after 4 shows.

3 shows the piston 1 in a position where further removal of the product 3 through the hand pump 11 a curvature of the soil 8th in the second stable position begins and later in an empty container 4 the position after the 4 occupies.

1

piston

2.2

pump dispenser

3

product

4

container

5

removal opening

6

cap

7

Flatring

8th

ground

9

film hinge

10

deformation groove

11

hand pump

Claims (1)

Pump dispenser ( 2.2 ) with a hand pump ( 11 ) and a piston ( 1 ) made of plastic for removing portions of a liquid product ( 3 ) from a hollow cylinder-like container ( 4 ) via a removal opening ( 5 ) of a cap ( 6 ) container ( 4 ), the piston ( 1 ) to the seal with the container ( 4 ) a peripheral flat ring ( 7 ) and into the container ( 4 ) is axially displaceable and a floor ( 8th ) for the container ( 4 ), characterized in that the bottom ( 8th ) is formed bistable such that the fully filled container ( 4 ) the floor ( 8th ) convexly convex towards the outside and at the empty container ( 4 ) by means of a suction vacuum of the hand pump ( 11 ) is concavely arched and thereby on the cap ( 6 ) inside complementary that the bottom ( 8th ) with the flat ring ( 7 ) by means of an annular film hinge ( 9 ), wherein the film hinge ( 9 ) in the upper region of the flat ring ( 7 ) and that the ground ( 8th ) at least one concentric deformation groove ( 10 ) having.