Capsule containing a dose of substance for making a drink, and a method for making a drink using the capsule

1. A capsule containing a dose of a substance for making a drink, for use with a apparatus provided with means for feeding pressurized water and/or steam into a housing chamber of the capsule, the capsule comprising:

a cup-shaped main body forming the housing chamber containing the substance, the main body including a bottom wall forming the bottom of the cup, the bottom wall configured to prevent liquid flow therethrough until the bottom wall is torn or penetrated, and a lateral wall connected at a lower portion thereof to the bottom wall and including an upper portion delimiting an opening for access to the housing chamber, the main body allowing beverage flow through it only after the bottom wall has been torn or penetrated by piercing means;

a cover element fixed to the upper portion of the lateral wall for closing the access opening;

characterised in that the lateral wall of the capsule includes lengthening means positioned between the cover element and the lower portion of the lateral wall and which, following an increase in the capsule internal pressure, allows a movement of the lower portion of the lateral wall and the bottom wall away from the cover element due to the increase in capsule internal pressure.

2. The capsule according to claim 1 , characterised in that the lengthening means allow said movement following an increase in the capsule internal pressure at least to a predetermined value.

3. The capsule according to claim 1 , characterised in that the lengthening means are constituted by a shaped portion of the lateral wall.

4. The capsule according to claim 3 , characterised in that following the increase in the internal pressure, the shaped portion can be elastically and/or plastically deformed from a starting condition to a deformed condition in which the lower portion and the bottom wall are further from the cover element than when the shaped portion is in the starting condition.

5. The capsule according to claim 4 , characterised in that the shaped portion forms at least one concavity and/or one convexity relative to the rest of the lateral wall.

6. The capsule according to claim 1 , characterised in that the lengthening means extend perimetrically on the lateral wall of the containment body.

7. The capsule according to claim 1 , characterised in that the lengthening means allow the movement of the lower portion of the lateral wall and of the bottom wall connected to it when the capsule internal pressure exceeds a limit value of between 1 bar and 15 bar.

8. A apparatus for making a drink, comprising:

a capsule containing a dose of a substance for making a drink, and including;

a cup-shaped main body forming the housing chamber containing the substance, the main body including a bottom wall forming the bottom of the cup, the bottom wall configured to prevent liquid flow therethrough until the bottom wall is torn or penetrated, and a lateral wall connected at a lower portion thereof to the bottom wall and including an upper portion delimiting an opening for access to the housing chamber, the main body allowing beverage flow through it only after the bottom wall has been torn or penetrated by a piercing means;

a cover element fixed to the upper portion of the lateral wall for closing the access opening; and

at the lateral wall, lengthening means positioned between the cover element and the lower portion of the lateral wall and which, following an increase in the capsule internal pressure, allow a movement away from the cover element by the lower portion of the lateral wall and the bottom wall connected to it; and

an apparatus including;

an extraction unit which can be opened, the inside of this unit forming an extraction chamber in which the capsule can be inserted;

first piercing means mounted in the extraction chamber in such a way that they pierce the cover element of a capsule inserted in the extraction chamber when the unit is closed;

means for feeding water and/or steam into the capsule, the feed means being operatively associated with the first piercing means;

second piercing means mounted in the extraction chamber for piercing the bottom wall of the capsule inserted in the extraction chamber and allowing the drink to be supplied;

the second piercing means being positioned so that when the capsule is inserted in the extraction chamber and the lower portion of the lateral wall and the bottom wall are not moved away from the cover element, the bottom wall is not penetrated enough to allow the drink to be supplied, and so that they completely penetrate the bottom wall and allow the drink to be supplied when the lower portion of the lateral wall and the bottom wall are moved away from the cover element.

9. A method for making a drink using a capsule containing a dose of a substance for making a drink, in which the capsule includes;

a cup-shaped main body forming the housing chamber containing the substance, the main body including a bottom wall forming the bottom of the cup, the bottom wall configured to prevent liquid flow therethrough until the bottom wall is torn or penetrated, and a lateral wall connected at a lower portion thereof to the bottom wall and including an upper portion delimiting an opening for access to the housing chamber, the main body allowing beverage flow through it only after the bottom wall has been torn or penetrated by piercing means;

a cover element fixed to the upper portion of the lateral wall for closing the access opening; and

at the lateral wall, lengthening means positioned between the cover element and the lower portion of the lateral wall and which, following an increase in the capsule internal pressure, allow a movement away from the cover element by the lower portion of the lateral wall and the bottom wall connected to it;

the method comprising the operating steps of:

piercing the cover element;

feeding water and/or steam under pressure through the cover element into the capsule;

increasing the internal pressure in the capsule to at least a predetermined value so as to cause the lower portion of the lateral wall to be moved away from the cover element; and

thereby moving the bottom wall against external piercing means causing the consequent tearing of the bottom wall against the external piercing means, allowing the drink to be supplied through the bottom wall.