Container for storing and unloading bulk material

1. Container for storing and unloading bulk material, the container comprising:

a vessel having a closed end and an opened end,

a hopper inside the vessel and tapering to a discharge outlet in a direction of the opened end, the hopper comprising an outer skirt presenting the same form as the vessel, the skirt being able to fit inside the vessel and to position the hopper inside the vessel, the skirt positioned inside the vessel between an inner wall of the vessel and the tapered portion of the hopper, and

a tearable membrane closing the hopper and the vessel.

2. Container according to claim 1 wherein the vessel is a cylinder.

3. Container according to claim 1 wherein a groove extends between a wall of the hopper and a wall of the vessel along an entire periphery of the discharge outlet.

4. Container according to claim 1 wherein the hopper has a tapering angle of between 15 and 50°.

5. Container according to claim 1 wherein the hopper comprises a bulk material guiding device coupled to the tapered end of the hopper.

6. Container according to claim 1 wherein the edge of the discharge outlet of the hopper is recessed inside the vessel and the tearable membrane covers the discharge outlet of the hopper and is connected to an inner wall of the vessel.

7. Container according to claim 1 wherein the discharge outlet of the hopper is substantially in a same plane as the opened end of the vessel and the tearable membrane covers the discharge outlet of the hopper and the opened end.

8. Container according to the claim 1 wherein the skirt comprises a stopping edge that can be positioned on the edge of the opened end.

9. Container according to claim 1 wherein the tearable membrane is tearable by a contact pressure on its surface.

10. Tank for storing bulk material and capable of being refilled by a container that stores bulk material and comprises a vessel having a closed end and an opened end, a hopper inside the vessel and tapering to a discharge outlet in a direction of the opened end, the hopper comprising an outer skirt presenting the same form as the vessel, the skirt being able to fit inside the vessel and to position the hopper inside the vessel, the skirt positioned inside the vessel between an inner wall of the vessel and the tapered portion of the hopper, and a tearable membrane closing the hopper and the vessel, the tank comprising a refilling opening comprising means for piercing the tearable membrane of the container and for cooperating with the hopper of the container by inserting between the skirt and the tapered portion of the hopper.

11. Tank according to claim 10 where the means for piercing the tearable membrane of the container and for cooperating with the hopper of the container are a conduit having a section that is smaller than the opened end and larger than the discharge outlet.

12. Tank according to claim 10 wherein the tank is a coffee powder tank of a coffee machine.

13. Coffee machine that can be refilled by a container comprising a vessel having a closed end and an opened end, a hopper inside the vessel and tapering to a discharge outlet in a direction of the opened end, the hopper comprising an outer skirt presenting the same form as the vessel, the skirt being able to fit inside the vessel and to position the hopper inside the vessel, the skirt positioned inside the vessel between an inner wall of the vessel and the tapered portion of the hopper, and a tearable membrane closing the hopper and the vessel, the coffee machine having a dosing unit comprising means for piercing the tearable membrane of the container and for cooperating with the hopper of the container by inserting between the skirt and the tapered portion of the hopper.

14. Coffee machine according to claim 13 where the means for piercing the tearable membrane of the container and for cooperating with the hopper of the container is a conduit having a section smaller than the opened end and larger than the discharge outlet.

15. Container for storing and unloading bulk material, the container comprising:

a vessel having a closed end and an opened end,

a hopper inside the vessel and tapering to a discharge outlet in a direction of the opened end,

a cylinder connected to the tapered portion of the hopper, the cylinder comprising a cylinder outlet that forms the discharge outlet, and the cylinder outlet is substantially in a same plane as the opened end of the vessel, and

a tearable membrane closing the hopper and the vessel.

16. Method for refilling a tank with a container for storing and unloading bulk material comprising a vessel having a closed end and an opened end, a hopper inside the vessel and tapering to a discharge outlet in a direction of the opened end, and a tearable membrane closing the hopper and the vessel, the tank having a refilling opening comprising means for piercing the tearable membrane of the container and for cooperating with the hopper of the container, the method comprising the steps of:

positioning an outer skirt of the hopper inside the vessel to position the hopper inside the vessel, the skirt presenting the same form as the vessel and being positioned inside the vessel between an inner wall of the vessel and the tapered portion of the hopper;

positioning the container and the tank refilling opening so that the container tearable membrane faces the tank refilling opening,

pushing the container against the tank refilling opening or the tank refilling opening against the container in order to break the container tearable membrane by inserting the refilling opening of the tank between the outer skirt of the hopper and the tapered portion of the hopper, and

turning the assembly of the container and the tank so that bulk material flows by gravity into the tank.

17. Method according to claim 16 where the volume of the tank is less than the volume of the container and the container is used as an expansion tank.

18. Container according to claim 1 wherein the skirt comprises a stopping edge that extends laterally, and the stopping edge abuts the opened end of the vessel.