| 摘要 |
A device 50 for preparing a beverage from a food substance contained in a capsule 24 by feeding a liquid into the capsule 24 provided to the device 50, the device comprising an extraction head 20 which comprises: a first and second enclosing members 10a, 10b delimiting a receptacle 25 for enclosing a capsule 24, a closing mechanism 1 to act on at least one 10a of the enclosing members 10a, 10b in relative displacement of the enclosing members, between an open position of the receptacle 25 and a closed position of the receptacle 25 with the capsule positioned therein, the closing mechanism 1 further comprising a locking means 13, a lever 21 and force demultiplying means 11 for transmitting a movement of the lever 21 into the relative displacement of the enclosing members 10a,10b. The force demultiplying means connects the lever to the locking means by a cam-type mechanism forming a free sliding arrangement which is designed such that a distance between a cam of the cam-type mechanism and a rotational axis of the lever is reduced progressively along with the closure movement of the lever. The locking means is a knee-joint mechanism connected to at least one of the enclosing members. The cam-type mechanism comprises a cam path connecting the lever and an arm of the knee-joint mechanism. The demultiplying means 11 are designed to vary a transmission ratio of the closing mechanism 1 acting between the lever 21 and at least one 10a of the enclosing members 10a, 10b.
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