Patent ID: 8225709

Claim:
Infusion unit for infusion preparation, in particular espresso coffee, by means of an infusion powder, comprising: a stationary piston ( 43 ), a mobile chamber ( 46 ) and a mobile piston ( 48 ) concentric to the mobile chamber, apt to co-operate for the preparation of said infusion by means of said powder and to generate a tablet of exhausted powder, said mobile piston ( 48 ) being arranged to move relative to the mobile chamber ( 46 ) so as to prepare said tablet of exhausted powder for being ejected from said infusion unit by a mechanically activated ejection device ( 49 ); said infusion unit comprises a plate ( 45 ) associated to movement means ( 55 , 65 , 66 ) arranged to move said plate, said chamber comprises at least one resilient linking element ( 71 ) having a determined rigidity and arranged to link said chamber to said plate in order to induce the movement of said chamber together with said plate and to allow relative movement of said chamber as to said plate, and said ejection device is connected to said plate and is mechanically activated by the relative movement of said plate as to said chamber.