Patent ID: 8701548

Claim:
A device for preparing a beverage from a food substance contained in a capsule by feeding a liquid into the capsule provided to the device, the device comprising an extraction head comprising: a first and second enclosing member defining a receptacle for enclosing a capsule; a closing mechanism to act on at least one of the enclosing members in relative displacement of the enclosing members, between an open position of the receptacle and a closed position of the receptacle with the capsule positioned therein; the closing mechanism comprising a locking member, a lever and force demultiplying member for transmitting a movement of the lever into the relative displacement of the enclosing members; and wherein the demultiplying member is designed to vary a transmission ratio of the closing mechanism acting between the lever and at least one of the enclosing members, and the force demultiplying member connects the lever to the locking member by a cam mechanism forming a free sliding arrangement which is designed such that a distance between a cam of the cam mechanism and a rotational axis of the lever is reduced progressively along with the closure movement of the lever.