Patent ID: 8481098

Claim:
Device for the preparation of a beverage comprising: a mixing chamber for mixing a soluble ingredient and a diluent, the chamber comprising: a top opening, a diluent inlet opening, a beverage outlet opening, a sealing member, the sealing member being able to seal the top opening of the mixing chamber and prevent any fluid from leaving the mixing chamber through the sealing member wherein, the sealing member comprising a cover that is able to move relative to the mixing chamber such that in a first position the top opening of the mixing chamber is opened and in a second position the cover closes the top opening of the mixing chamber, and the cover comprising a rigid material part and at least one soft material part wherein the at least one soft material part is of a material and positioned such that the at least one soft material part efficiently sticks to the edges of the top opening of the mixing chamber when the device is used to prepare a beverage, thus imparting sealing to the top opening of the mixing chamber, and wherein during evacuation of the beverage from the mixing chamber and induced sucking therein, the at least one soft material part deforms to improve its sealing function.