Patent ID: 8578839

Claim:
An appliance for preparing an infusion, the appliance comprising: a case, said case comprising (a) an infusion head containing a chamber with an opening through which a fill of substance for infusing can be inserted and presenting in its end wall a hot water feed nozzle, and that is fitted with a closure part presenting an outflow orifice for the infusion, the closure part being movably mounted relative to said chamber to transition between two positions, an open position and a closed position, the open position corresponding to filling and emptying said chamber and the closed position corresponding to preparing the infusion with the closure part closing the chamber, and with a water container communicating with said nozzle, and (b) a body containing a pressurizing device having an active state or an inactive state and designed to be in the active state to deliver air in order to pressurize said water container, and control means suitable for causing a certain volume of water raised to an infusion temperature to be delivered from said container into the infusion chamber, said pressurizing device being connected to a compression chamber that is arranged between said pressurizing device and said water container and that includes inlet and outlet isolation devices, wherein with the water container being full and the outlet device including the control means, the control means are suitable, when the pressurization device is placed in the inactive state, for causing compressed air to expand suddenly into said water-filled container and then to flow with a pressure curve that decreases down to the end of an infusion cycle, wherein the outlet isolation device includes an outlet nozzle connected to a duct leading to the water container and including the control means formed by an on/off type valve, wherein said on/off valve comprises a movable slider slidable in a two-port cylinder so as to occupy, starting from a rest state corresponding to closure of the outlet isolation of the compression chamber, a first port corresponding to delivering the air pressure into the container and beginning infusion, and a second port corresponding to stopping the delivery of air pressure to the container and thus stopping infusion, and connecting the container to the surrounding atmosphere.