Collection receptacle for collecting insoluble material that is used for preparing beverages, as well as infusion device with such a collection receptacle

1. A collection receptacle assembly for collecting insoluble material that is used for preparing beverages by an infusion device, wherein the infusion device comprises:

a container with an open end and a closed end for holding the beverage and the insoluble material;

a piston-filter arrangement that can be inserted into the container via the open end and can be moved toward the closed end, wherein the collection receptacle is configured for insertion into the container; and

a collection receptacle having a wall that forms an opening that is surrounded by an edge, a first coupling element that can be coupled with a second coupling element of the piston-filter arrangement such that, in a coupled state, a distance (X) is defined between the edge of the collection receptacle and the piston-filter arrangement, wherein the first coupling element is arranged on a central projection of the collection receptacle and the central projection projects past the edge,

wherein the central projection encloses a hollow space, the first coupling element comprises a coupling opening that opens into the hollow space on a free end of the central projection, the coupling opening tapers conically when viewed from the free end.

2. The collection receptacle assembly according to claim 1 , wherein the central projection has a first height (H 1 ) and the collection receptacle has a second height (H 2 ) at the edge and the central projection projects with a height difference (ΔH) between one millimeter and eight millimeters (1-8 mm).

3. The collection receptacle assembly according to claim 2 , wherein the height difference (ΔH) is between two and six millimeters (2-6 mm).

4. The collection receptacle assembly according to claim 2 , wherein the collection receptacle has a diameter (DA) and a ratio of the height difference (ΔH) to the diameter (DA) is between one one-hundredth and seven one-hundredths (0.01-0.07).

5. The collection receptacle assembly according to claim 1 , wherein the central projection has at least one recess starting from the free end and passing through the wall.

6. The collection receptacle assembly according to claim 1 , wherein the central projection is formed by the wall.

7. The collection receptacle assembly according to claim 1 , wherein the wall defines a base area and a side area, the wall in the side area extending approximately perpendicular to the base area.

8. The collection receptacle assembly according to claim 7 , wherein the collection receptacle has drainage openings arranged in the base area.

9. An infusion device for preparing beverages, the infusion device comprising:

a container with an open end and a closed end configured for holding a beverage and insoluble material;

a piston-filter arrangement configured for insertion into the container via the open end and for movement toward the closed end; and

a collection receptacle configured for insertion into the container, the collection receptacle including a wall having an edge and defining an opening, the collection receptacle configured for coupling with the piston-filter arrangement, wherein, in a coupled state, a distance (X) is formed between the edge of the collection receptacle and the piston-filter arrangement,

wherein the collection receptacle has a central projection enclosing a hollow space, the central projection has a coupling opening that opens into the hollow space on a free end of the central projection, and the coupling opening tapers conically when viewed from the free end.

10. The infusion device according to claim 9 , wherein the distance (X) between the edge and the piston filter arrangement is between three and ten millimeters (3-10 mm).

11. The infusion device according to claim 10 , wherein the distance (X) is between three and six millimeters (3-6 mm).

12. The infusion device according to claim 9 , wherein the collection receptacle includes a first coupling element and the piston-filter arrangement includes a second coupling element, the first and second coupling elements comprise a positive-locking means that interact with each other in the coupled state.

13. The infusion device according to claim 12 , wherein one of the first coupling element and the second coupling element comprises an essentially spherical or cylindrical section that is surrounded, in the coupled state, by locking arms.